Numerical Code for Seismic Collapse Analysis of Framed Structures


In the conventional design of a building, only static analysis in the horizontal and uniaxial directions is commonly carried out, in order to minimize calculation costs. This approach can ensure the structural strength of the building, if there is sufficient strength to support the load in the vertical direction. For a similar reason, the mass system model replaces the building layer in dynamic analysis, and the complicated dynamic behavior of the structure at the member level becomes difficult to be examined sufficiently. Therefore, the development of a more precise and more efficient dynamic analysis code is strongly desired.

Recently, significant advances in the field of computers have been eliminating the calculation cost restrictions, and various dynamic analysis codes are being developed. Among those codes, there are some codes applicable to dynamic collapse problems which contain strong nonlinearities and discontinuities, such as the Distinct Element Method (DEM) or the Discontinuous Deformation Analysis (DDA). These codes have been applied to demolition analyses and seismic collapse analyses. However, the above-mentioned discrete numerical methods are computationally intensive and need detailed modeling. Therefore, they are suitable only for detailed analyses of either two-dimensional or small three-dimensional models.

On the other hand, the Finite Element Method (FEM), which is based on continuum material equations, has been successfully applied to a wide range of engineering problems including structural analyses of large-scale structures. However, the FEM is generally limited to analyses of relatively small displacements and it needs complicated modifications to simulate fracture occurring in structural members or joints. The main objective of this study is to develop a finite element code, which can simulate dynamic behaviors with such strong nonlinearities and discontinuities and is efficiently applicable to seismic collapse analyses of framed structures.

Toi and Isobe developed the Adaptively Shifted Integration (ASI) technique for the linear Timoshenko beam and the Bernoulli-Euler beam elements, which can be easily implemented into the existing finite element codes. In this technique, the numerical integration point is shifted immediately after the occurrence of a fully plastic section in the element so that a plastic hinge is formed exactly at that section. As a result, the ASI technique gives more precise elasto-plastic solutions than the conventional schemes, and has become able to simulate dynamic behaviors with strong nonlinearities by using only a small number of elements for a member. Structurally discontinuous problems have also become easily handled, by shifting the numerical integration point of the linear Timoshenko beam element to an appropriate position, and by releasing the resultant forces in the element simultaneously However, when the number of elements per member is very small, it still lacks accuracy in the elastic range compared to the converged solution, due to the low-order displacement function of the linear Timoshenko beam element.

To improve the accuracy in elastic range, Isobe and Lynn modified the ASI technique into an ASI-Gauss technique. The accuracy in elastic range is improved by placing the numerical integration points of the two consecutive elements forming an elastically deformed member in such a way that stresses and strains are evaluated at the Gaussian integration points of the two-element member, where the accuracy of bending deformation is mathematically guaranteed for two-point integration. The rest of the shiftings are done according to the flow of the ASI technique.

In this study, the ASI-Gauss technique is implemented into the finite element code in order to develop a more precise and less-calculation-time-consuming seismic collapse analytical tool. The purpose of this study is to verify the validity of the ASI-Gauss technique in seismic collapse analysis and to construct a highly efficient structural design tool for framed structures. An analysis involving member fracture and contact is performed on a large-scale framed structure to show the practicability of the scheme.



Collapse analysis of neighboring buildings under long-period seismic excitation

Collision of neighboring buildings under long-period seismic excitation is also a big issue. We focused on a specific apartment house with three same type 14-story buildings consecutively built with very narrow gaps of 10 cm in between, where two out of the three totally collapsed in the 1985 Mexican Earthquake. EW, NS and UD components of SCT seismic wave are subjected to the fixed points on the ground floor. The dead load for each floor is assumed to be 4.0 kN/m2. The time increment is set to 1 ms, and the calculation is done for a total of 183,501 steps. The analysis takes approximately 4 days with a personal computer (CPU: 2.93 GHz Xeon).

In this case, we set the natural period of the north building model to be 25% longer than the others. The difference of natural periods was actually observed in the same type buildings, caused by the damage that remained after past earthquakes. According to the numerical results, the collision of buildings may be generated by the difference of natural periods between neighboring buildings. The north building with a longer natural period first collides with the middle, consequently changing the natural period of the middle, which ends up generating other collisions between the south and the middle. The middle building first initiates collapse due to continuous collisions given from both sides, around 73 s from the start of seismic activity. Although the north building collapses a few seconds after the middle, the south building withstands the collisions and resists collapse.

(These outcomes were broadcasted in a NHK special program "MEGAQUAKE", on March 7, 2010.)

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Related papers (Books):

D. Isobe (co-author),Report on the Great East Japan Earthquake Disaster, Mechanical Engineering Volume, Chapter 4: Understanding Tsunami-causing Damage Mechanism of Machines and Structures Based on a Discipline of Mechanics, Joint Editorial Committee for the Report on the Great East Japan Earthquake Disaster, Maruzen, ISBN:978-4-88898-232-0, 2013.

D. Isobe (co-author),(Editors: Y. Yagi and Y. Ohsawa), Mega Earthquake and Induced Complex Disasters, Chapter 6: Sumulating Collapse Behaviors of Buildings under Earthquakes, University of Tsukuba Press, ISBN:978-4-904074-38-1, 2015.

D. Isobe: Simulating Collapse Behaviors of Buildings and Motion Behaviors of Indoor Components During Earthquakes, Earthquakes - Tectonics, Hazard and Risk Mitigation (Editor: Taher Zouaghi), InTech, ISBN:978-953-51-2885-4, pp. 341-363, 2017. Open Access

D. Isobe: Progressive Collapse Analysis of Structures: Numerical Codes and Applications, Elsevier, eBook ISBN: 9780128130421, Paperback ISBN: 9780128129753, 2017. Elsevier

Related papers (Journals):

Y.Toi and D.Isobe: Adaptively Shifted Integration Technique in the Finite Element Collapse Analysis of Framed Structures, Journal of the Society of Naval Architects of Japan, Vol.171, (1992), pp.363-371, in Japanese. abstract

Y.Toi and D.Isobe: Adaptively Shifted Integration Technique for Finite Element Collapse Analysis of Framed Structures, International Journal for Numerical Methods in Engineering, Vol.36, (1993), pp.2323-2339. abstract

Y.Toi and D.Isobe: Finite Element Analysis of Buckling Collapse Behaviors of Framed Structures by Using Adaptively Shifted Integration Technique, Journal of the Society of Naval Architects of Japan, Vol.174, (1993), pp.469-477, in Japanese. abstract

Y.Toi and D.Isobe: Finite Element Analysis of Dynamic Collapse Behaviors of Framed Structures by the Adaptively Shifted Integration Technique, Journal of the Society of Naval Architects of Japan, Vol.175, (1994), pp.299-306, in Japanese. abstract

Y.Toi and D.Isobe: Finite Element Analysis of Quasi-Static and Dynamic Collapse Behaviors of Framed Structures by the Adaptively Shifted Integration Technique, Computers and Structures, Vol.58, No.5, (1996), pp.947-955. abstract

D.Isobe and Y.Toi: Finite Element Analysis of Dynamic Collapse Behaviors of Brittle Framed Structures by the Adaptively Shifted Integration Technique, Journal of the Society of Naval Architects of Japan, Vol.180, (1996), pp.471-478, in Japanese. abstract

D.Isobe and Y.Toi: Analysis of Structurally Discontinuous Reinforced Concrete Building Frames Using the ASI Technique, Computers and Structures, Vol.76, No.4, (2000), pp.471-481. abstract

D.Isobe: Seismic Damage Analysis of Reinforced Concrete Buildings Considering Member Fracture, Journal of the Mechanical Behavior of Materials, Vol.11, Nos.1-3, (2000), pp.63-68. abstract

D.Isobe and M.Tsuda: Development of Seismic Collapse Analysis Code for RC Framed Structures Using Finite Element Method, Journal of Structural Engineering, Vol.48B, (2002), pp.385-394, in Japanese. abstract

D.Isobe and M.Tsuda: Seismic Collapse Analysis of Reinforced Concrete Framed Structures Using the Finite Element Method, Earthquake Engineering and Structural Dynamics, Vol.32, No.13, (2003), pp.2027-2046. abstract

T. Miyamura, M. Ohsaki, M. Kohiyama, D. Isobe, K. Onda, H. Akiba, M. Hori, K. Kajiwara and T. Ine: Large-Scale FE Analysis of Steel Building Frames Using E-Simulator, Progress in Nuclear Science and Technology, Vol. 2, (2011), pp.651-656. abstract

D. Isobe, T. Ohta, T. Inoue and F. Matsueda: Seismic Pounding and Collapse Behavior of Neighboring Buildings with Different Natural Periods, Natural Science, Vol. 4, No. 8A, (2012), pp.686-693. abstract

D. Isobe, W.S. Han and T. Miyamura: Verification and Validation of a Seismic Response Analysis Code for Framed Structures using the ASI-Gauss Technique, Earthquake Engineering and Structural Dynamics, Vol.42, No.12, (2013), pp.1767-1784. abstract

M. Asai, T. Goda, K. Oguni, D. Isobe, K. Kashiyama and M. Ishiki: Evaluation of Tsunami Fluid Force Acted on Tsunami Refuge Building by Using a Stabilized ISPH,  Journal of applied mechanics, Japan Society of Civil Engineers, Vol. 70, No. 2, (2014), pp.649-658, in Japanese. abstract

H. Ogino, T. Yamashita, M. Kaneko and D. Isobe: Development of a Finite Element Code to Simulate Behaviors of Furniture under Seismic Excitation, Journal of Structural and Construction Engineering, AIJ, Vol. 80, No. 717, (2015), pp.1687-1697, in Japanese. abstract

D. Isobe, T. Yamashita, H. Tagawa, M. Kaneko, T. Takahashi and S. Motoyui: Motion Analysis of Furniture under Seismic Excitation using FEM, Journal of Structural and Construction Engineering, AIJ, Vol. 80, No. 718, (2015), pp.1891-1900, in Japanese. abstract

Related papers (Proceedings):

M.Tsuda and D.Isobe: Development of Seismic Collapse Analytical Scheme for RC Space Framed Structures Using Finite Element Method, Proceedings of the Conference on Computational Engineering and Science, Vol.6, No.2, (2001), pp.463-466, in Japanese. abstract

D.Isobe and M.Tsuda: Development of Seismic Damage Finite Element Code for Reinforced Concrete Framed Structures, CD-ROM Proceedings of the 2nd International Conference on Advances in Structural Engineering and Mechanics ASEM'02, (2002), Busan, Korea. abstract

T. Ine, D. Isobe, N. Katahira and K. Kajiwara: Dynamic Collapse Analysis for Elasto-Plastic Behaviors of the Steel Frame under Seismic Loads using ASI-Gauss Technique, Part 1: Development of Dynamic Collapse Analysis Code, Proceedings of the 77th Architectural Research Meetings, Kanto Chapter AIJ, (2007), pp.165-168, in Japanese. abstract

T. Ine, D. Isobe, N. Katahira and K. Kajiwara: Dynamic Collapse Analysis for Elasto-plastic Behaviors of the Steel Frame under Seismic Loads using ASI-Gauss Technique, Abstracts of the International Conference on Computational Methods (ICCM2007), (2007), Hiroshima, Japan. abstract

T. Ine, D. Isobe, N. Katahira and K. Kajiwara: Dynamic collapse analysis for the steel framed structures using ASI-Gauss technique, Proceedings of the Conference on Computational Engineering and Science, Vol.12, No.1, (2007), pp.387-390, in Japanese. abstract

D. Isobe and N. Katahira: A Dynamic Finite Element Code for Analyzing Collapse Behaviors of Framed Structures under Seismic Loads, CD-ROM of the ECCOMAS Thematic Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN2007), (2007), Crete, Greece. abstract

T. Ine, D. Isobe, N. Katahira and K. Kajiwara: Seismic Collapse Analysis of the Steel Framed Structure using ASI-Gauss Technique, Summaries of Technical Papers of Annual Meeting Architectural Institute of Japan 2007 B-1, (2007), pp.257-258, in Japanese. abstract

N. Katahira, D. Isobe, T. Ine and K. Kajiwara: Seismic Collapse Analysis of Large Framed Structure using ASI-Gauss Technique, Summaries of Technical Papers of Annual Meeting Architectural Institute of Japan 2007 B-1, (2007), pp.259-260, in Japanese. abstract

N. Katahira, D. Isobe, T. Ine and K. Kajiwara: Development of Seismic Collapse Analysis System using ASI-Gauss technique -Verification of Analytical Code-, Proceedings of the 20th JSME Computational Mechanics Conference, No.07-36, (2007), pp.343-344, in Japanese. abstract

N. Katahira, D. Isobe, T. Ine and K. Kajiwara: Development of Seismic Collapse Analysis Code for Framed Structures under Three-Dimensional Excitation, Proceedings of the 57th National Congress of Theoretical & Applied Mechanics, (2008), pp.241-242, in Japanese. abstract

N. Katahira, D. Isobe, T. Ine and K. Kajiwara: Seismic Collapse Analysis of Large Framed Structure under Three-Dimensional Excitation, Summaries of Technical Papers of Annual Meeting Architectural Institute of Japan 2008 B-1, (2008), pp.395-396, in Japanese. abstract

N. Katahira, D. Isobe, T. Ine and K. Kajiwara: Development of Macro-Model Seismic Collapse Simulator for Framed Structures using ASI-Gauss Technique, CD-ROM Proceedings of the 14th World Conference on Earthquake Engineering (14WCEE), (2008), Beijing, China. abstract

N. Katahira, D. Isobe, T. Ine and K. Kajiwara: Verification of Macro-Model Seismic Collapse Analysis Code for Framed Structures, Proceedings of the 21th JSME Computational Mechanics Conference, No.08-33, (2008), pp.63-64, in Japanese. abstract

M. Ohsaki, T. Miyamura, M. Kohiyama, D. Isobe, H. Akiba, M. Hori, K. Kajiwara and T. Ine: High-Precision Finite Element Analysis of Elastoplastic Seismic Responses of Steel Building Frames, Proceedings of the Conference on Computational Engineering and Science, Vol.14, No.2, (2009), pp.829-832, in Japanese. abstract

T. Miyamura, M. Ohsaki, M. Kohiyama, D. Isobe, H. Akiba, M. Hori, K. Kajiwara and T. Ine: Virtual Shaking-Table Test of Super-Highrise Steel Frame and 4-Story Steel Frame Using Prototype of E-Simulator, Summaries of Technical Papers of Annual Meeting Architectural Institute of Japan 2009 B-1, (2009), pp.399-400, in Japanese. abstract

T. Miyamura, M. Ohsaki, M. Kohiyama, K. Onda, D. Isobe, H. Akiba, M. Hori, K. Kajiwara and T. Ine: High-Precision Finite Element Analysis of 4-Story Steel Frame Discretized by Solid Elements, Proceedings of the 22th JSME Computational Mechanics Conference, No.09-21, (2009), pp.218-219, in Japanese. abstract

D. Isobe:An adaptive finite element code for impact and collapse analyses of buildings, Abstracts of the 2nd International Workshops on Advances in Computational Mechanics (IWACOM-II), (2010), Yokohama, Japan. abstract

M. Ohsaki, T. Miyamura, M. Kohiyama, K. Onda, D. Isobe, H. Akiba, M. Hori, K. Kajiwara and T. Ine: High-Precision Finite Element Analysis of Steel Building Frames, Proceedings of the Conference on Computational Engineering and Science, Vol.15, No.1, (2010), pp.437-438, in Japanese. abstract

Y. Arakaki, T. Hisanaga, T. Katsu, L. T. T. Thanh and D. Isobe: Impact and Collapse Analysis of Neighboring Buildings Subjected Under Long-Period Seismic Excitation, Proceedings of the Conference on Computational Engineering and Science, Vol.15, No.2, (2010), pp.1011-1014, in Japanese. abstract

D. Isobe: Structural Collapse Analyses of Buildings Using an Adaptive Finite Element Code, Abstracts of the 4th Korea-Japan COSEIK-JSCES Workshop on Computational Engineering, (2010), Fukuoka, Japan. abstract

D. Isobe, L. T. T. Thanh, T. Katsu and Y. Arakaki, Recent Applications of ASI-Gauss FE Code in Structural Collapse Problems of Large-Scale Framed Structures, Proceedings of the 9th World Congress on Computational Mechanics and 4th Asian Pacific Congress on Computational Mechanics (WCCM/APCOM2010), (2010), Sydney, Australia. abstract

T. Miyamura, D. Isobe, M. Kohiyama, M. Ohsaki, H. Akiba, M. Hori, K. Kajiwara and T. Ine: Comparison between Virtual Shaking-Table Test of Super-Highrise Steel Frame Using E-Simulator and Beam Element Analysis, Summaries of Technical Papers of Annual Meeting Architectural Institute of Japan 2010 B-1, (2010), pp.291-292, in Japanese. abstract

T. Ohta, D. Isobe, T. Inoue and F. Matsueda: Collision between Neighboring Buildings under Long-Period Ground Motion, Part 1: Lessons Learned from 1985 Michioacan Earthquake, Summaries of Technical Papers of Annual Meeting Architectural Institute of Japan 2010 B-2, (2010), pp.939-940, in Japanese. abstract

D. Isobe, T. Ohta, T. Inoue and F. Matsueda: Collision between Neighboring Buildings under Long-Period Ground Motion, Part 2: Impact and Collapse Analysis of 14-Story Three Connected Buildings, Summaries of Technical Papers of Annual Meeting Architectural Institute of Japan 2010 B-2, (2010), pp.941-942, in Japanese. abstract

E. Onda and D. Isobe: Development of Seismic Collapse Analysis Code for RC Framed Structures Using ASI-Gauss Technique, Proceedings of the 23th JSME Computational Mechanics Conference, No.10-2, (2010), pp.418-420, in Japanese. abstract

D. Isobe, T. Ohta, T. Inoue and F. Matsueda: Impact and Collapse Analysis of Neighboring Buildings under Long-Period Ground Motion, CD-ROM Proceedings of the 13th Japan Earthquake Engineering Symposium, (2010), pp.4324-4329, in Japanese. abstract

Wonsang Han and D. Isobe: Performance Validation of Seismic Response Analysis Code Using ASI-Gauss Technique, CD-ROM Proceedings of the Conference on Computational Engineering and Science, Vol.16, (2011), in Japanese. abstract

E. Onda and D. Isobe: Development of Seismic Collapse Analysis Code for RC Framed Structures Using ASI-Gauss Technique and Its Applications, CD-ROM Proceedings of the Conference on Computational Engineering and Science, Vol.16, (2011), in Japanese. abstract

T. Miyamura, M. Ohsaki, M. Kohiyama, J. Zhang, D. Isobe, H. Akiba, M. Hori, T. Yamashita and K. Kajiwara: High-precision finite element model of steel frames for collapse analysis, CD-ROM Proceedings of the Conference on Computational Engineering and Science, Vol.16, (2011), in Japanese. abstract

T. Miyamura, D. Isobe, M. Ohsaki, M. Kohiyama, M. Hori, H. Akiba, T. Yamashita and K. Kajiwara: Comparison between Virtual Shaking-Table Test of 4-story Steel Frame Using E-Simulator and Beam Element Analysis, Summaries of Technical Papers of Annual Meeting Architectural Institute of Japan 2011 B-1, (2011), pp.233-234, in Japanese. abstract

M. Kohiyama, T. Miyamura, D. Isobe, M. Ohsaki, K. Onda, M. Hori, H. Akiba, K. Kajiwara, and T. Ine: E-SIMULATOR VIRTUAL SHAKING-TABLE TEST: Comparative Study on Elastoplastic Dynamic Responses of Super-Highrise Steel Frame Between Virtual Shaking-Table Test Using E-Simulator and Beam Element Analysis, Proc. EUROSTEEL 2011, 6th European Conference on Steel and Composite Structures, (2011), Vol. B, pp.1113-1118, Budapest, Hungary. abstract

D. Isobe, T. Ohta, T. Inoue and F. Matsueda: Seismic Pounding Analysis of Neighboring Buildings under Long-Period Ground Motion, Proceedings of International Symposium on Disaster Simulation and Structural Safety in the Next Generation 2011 (DS'11), (2011), pp.209-214, Kobe, Japan. abstract

D. Isobe and E. Onda: Finite Element Analysis on Collapse Behavior of CTV Building, Proceedings of the 24th JSME Computational Mechanics Conference, No.11-3, (2011), pp.570-571, in Japanese. abstract

Z. He, D. Isobe, M. Kaneko and M. Hori: Motion Analysis on Overturning Behavior of Furniture Using ASI-Gauss Technique, CD-ROM Proceedings of the Conference on Computational Engineering and Science, Vol.17, (2012), in Japanese. abstract

D. Isobe, Z.H. He, M. Kaneko and M. Hori: Motion Analysis of Furniture under Sine Wave Excitations, Proceedings of the International Symposium on Reliability Engineering and Risk Management (ISRERM2012), (2012), pp.230-233, Yokohama, Japan. abstract

D. Isobe: A Collapse Analysis Code and Its Recent Applications, Abstracts of the 1st Spain - Japan Workshop on Computational Mechanics, (2012), Barcelona, Spain. abstract

Y. Dong and D. Isobe: Collapse Analysis of Steel Framed Structure Subjected under Tsunami Debris Collision, Proceedings of the 25th JSME Computational Mechanics Conference, No.12-4, (2012), pp.83-84, in Japanese. abstract

T. Miyamura and D. Isobe: On the Verification and Validation of Seismic Response Analyses of the 4-Story Steel Frame Using ASI-Gauss Code and E-Simulator, Proceedings of the 25th JSME Computational Mechanics Conference, No.12-4, (2012), pp.339-340, in Japanese. abstract

Z. He and D. Isobe: Seismic Motion Analysis of Furniture Placed in a Building, Proceedings of the 25th JSME Computational Mechanics Conference, No.12-4, (2012), pp.343-344, in Japanese. abstract

D. Isobe, W.S. Han and T. Miyamura: A Seismic Collapse Analysis Code for Framed Structures using ASI-Gauss Technique, Abstracts of the 2nd International Conference on Computational Design in Engineering (CODE2012), (2012), Jeju, Korea. abstract

Y. Dong and D. Isobe: Collapse Analysis of Building due to Tsunami Debris Impact, Proceedings of the 62nd National Congress of Theoretical & Applied Mechanics 2013, (2013), in Japanese. abstract

T. Miyamura, M. Ohsaki, T. Yamashita, D. Isobe and M. Kohiyama: Dynamic Collapse Analysis of Four-Story Steel Frame Using E-Simulator, CD-ROM Proceedings of the ECCOMAS Thematic Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN2013), (2013), Kos, Greece. abstract

D. Isobe and Y. Ido: Numerical Investigation on the Collapse of the CTV Building Caused by the 2011 New Zealand Earthquake, CD-ROM Proceedings of the ECCOMAS Thematic Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN2013), (2013), Kos, Greece. abstract

Y. Ido and D. Isobe: Seismic Collapse Analysis of the CTV Building, CD-ROM Proceedings of the Conference on Computational Engineering and Science, Vol.18, (2013), in Japanese. abstract

Y. Dong and D. Isobe: Collapse Analysis of Building due to Tsunami and Tsunami Debris Impact, CD-ROM Proceedings of the Conference on Computational Engineering and Science, Vol.18, (2013), in Japanese. abstract

T. Yamashita, J. Gu, M. Kaneko and D. Isobe: Motion Analysis on Overturning Behavior of Furniture against Three-Dimensional Ground Motion  -Part1 Outline of Shake Table Test of Furniture Using Motion Capture System-, Summaries of Technical Papers of Annual Meeting Architectural Institute of Japan 2013, (2013), pp. 661-662, in Japanese. abstract

D. Isobe and Y. Dong: Study on Structural Design of Steel Framed Buildings using Tsunami Debris Impact Analysis, Proceedings of the 26th JSME Computational Mechanics Conference, No.13-3, (2013), in Japanese. abstract

J. Gu, T. Yamashita, M. Kaneko and D. Isobe: Motion Analysis of Furniture using FEM, USB Proceedings of APCOM & ISCM2013, (2013), Singapore. abstract

K. Kuroda, Y. Dong and D. Isobe: Structural Collapse Analysis of a Steel Building Subjected under Seismic Excitation, Tsunami Force, and Debris Collision, USB Proceedings of APCOM & ISCM2013, (2013), Singapore. abstract

H. Tagawa, T. Yamamoto, T. Yamashita, K. Kajiwara and D. Isobe: Numerical Simulation of Suspended Ceiling Collapse using ASI-Gauss Technique, Extended Abstracts of the 1st International Conference on Computational Engineering and Science for Safety and Environmental Problems (COMPSAFE2014), (2014), pp. 456-459, Sendai, Japan. abstract

D. Isobe and K.Takatera: Estimation of Secured Distance between Neighboring Buildings to Avoid Seismic Pounding, Extended Abstracts of the 1st International Conference on Computational Engineering and Science for Safety and Environmental Problems (COMPSAFE2014), (2014), pp. 464-467, Sendai, Japan. abstract

T. Yamamoto, H. Tagawa, T. Yamashita and D. Isobe: Collapse Analysis of Gymnasium Ceiling Using ASI-Gauss Technique, CD-ROM Proceedings of the Conference on Computational Engineering and Science, Vol.19, (2014), in Japanese. abstract

H. Ogino and D. Isobe: Motion Analysis on Seismic Behavior of Furniture in Medical Facilities, CD-ROM Proceedings of the Conference on Computational Engineering and Science, Vol.19, (2014), in Japanese. abstract

K. Takatera and D. Isobe: Estimation of Secured Distance between Neighboring High-Rise Buildings under Seismic Motion, CD-ROM Proceedings of the Conference on Computational Engineering and Science, Vol.19, (2014), in Japanese. abstract

D. Isobe and Y.Q. Dong: Collapse Analysis of Buildings Subjected to Seismic Excitation, Tsunami, and Debris Collision, Proceedings of the 11th World Congress on Computational Mechanics (WCCM XI), (2014), Barcelona, Spain. abstract

H. Tagawa, T. Yamamoto, T. Yamashita, T. Sasaki and D. Isobe: Numerical Simulation of Ceiling Collapse in Full-Scale Gymnasium Specimen using ASI-Gauss Technique, Proceedings of the 11th World Congress on Computational Mechanics (WCCM XI), (2014), pp. 1398-1403, Barcelona, Spain. abstract

K. Kuroda and D. Isobe: Seismic Collapse Analysis of the CTV Building, Summaries of Technical Papers of Annual Meeting Architectural Institute of Japan 2014, (2014), pp. 351-352, in Japanese. abstract

J. Gu, T. Yamashita, M. Kaneko and D. Isobe: Motion Analysis on Overturning Behavior of Furniture against Three-Dimensional Ground Motion -Part2 Motion Analysis of Furniture using ASI-Gauss Technique-, Summaries of Technical Papers of Annual Meeting Architectural Institute of Japan 2014, (2014), pp. 1101-1102, in Japanese. abstract

H. Ogino and D. Isobe: Motion Analysis of Furniture in Medical Facilities under Seismic Excitations, Summaries of Technical Papers of Annual Meeting Architectural Institute of Japan 2014, (2014), pp. 1105-1106, in Japanese. abstract

T. Yamamoto, H. Tagawa, T. Yamashita and D. Isobe: Numerical Study on the Ceiling Collapse in Large-Space Buildings during Earthquakes -Part1 Basic Study, Summaries of Technical Papers of Annual Meeting Architectural Institute of Japan 2014, (2014), pp. 1107-1108, in Japanese. abstract

D. Isobe and Y. Dong: On Effects of Impact Force Applied by Tsunami Debris on Damages of Buildings, Proceedings of the 11th Symposium on Impact Problems of Strucures, (2014), in Japanese. abstract

K. Takatera and D. Isobe: Seismic Pounding Analysis for Estimating Appropriate Clearance between Adjacent Buildings, Proceedings of the 27th JSME Computational Mechanics Conference, No.14-14, (2014), in Japanese. abstract

H. Ogino and D. Isobe: Safety Evaluation of Tsunami Refuge Building by Impact Analysis of Tsunami Debris, Proceedings of the 27th JSME Computational Mechanics Conference, No.14-14, (2014), in Japanese. abstract

D. Isobe and Y.Q. Dong: Sequential Analysis of Steel Frame Building Subjected to Seismic Excitation, Tsunami, and Debris Collision, Proceedings of the 18th International Conference on Finite Elements in Flow Problems (FEF2015), (2015), Taipei, Taiwan. abstract

D. Isobe: Finite Element Analysis on Behaviors of Furniture and Ceiling during Seismic Excitation, the 3rd German-Japanese Workshop on Computational Mechanics, (2015), Munich, Germany. abstract

D. Isobe, T. Yamamoto, H. Tagawa, T. Yamashita and T. Sasaki: Finite Element Analysis of Ceiling Collapse during Seismic Excitation, the 1st Pan American Congress on Computational Mechanics (PANACM 2015), (2015), Buenos Aires, Argentina. abstract

M. Katagiri and D. Isobe: Motion Analysis on Seismic Behaviors of Door Frame in Buildings, CD-ROM Proceedings of the Conference on Computational Engineering and Science, Vol.20, (2015), in Japanese. abstract

H. Ogino and D. Isobe: Dynamic Analysis of Tsunami Refuge Building Subjected to Earthquake and Tsunami, CD-ROM Proceedings of the Conference on Computational Engineering and Science, Vol.20, (2015), in Japanese. abstract

D. Isobe, T. Yamamoto, H. Tagawa, T. Yamashita and T. Sasaki: Collapse Analysis of Ceiling in Gymnasium during Seismic Excitation, CD-ROM Proceedings of the Conference on Computational Engineering and Science, Vol.20, (2015), in Japanese. abstract

D. Isobe and K. Kuroda: Numerical Simulation on Collapse Behaviors of CTV Building Caused by the 2011 New Zealand Earthquake, Thematic Plenary Lecture, Abstracts of the International Conference on Computational Methods (ICCM2015), (2015), Auckland, New Zealand. abstract

M. Katagiri and D. Isobe: Deformation Analysis of Door Frame in a Steel Frame Building during Seismic Motion, Summaries of Technical Papers of Annual Meeting Architectural Institute of Japan 2015, (2015), pp. 333-334, in Japanese. abstract

D. Isobe, T. Yamamoto, H. Tagawa, T. Yamashita and T. Sasaki: Numerical Study on the Ceiling Collapse in Large-Space Buildings during Earthquakes  -Part2 Simulation of Partial Collapse, Summaries of Technical Papers of Annual Meeting Architectural Institute of Japan 2015, (2015), pp. 335-336, in Japanese. abstract

H. Ogino and D. Isobe: Numerical Study on Safety Evaluation of Tsunami Refuge Building, Summaries of Technical Papers of Annual Meeting Architectural Institute of Japan 2015, (2015), pp. 367-368, in Japanese. abstract

K. Takatera and D. Isobe: Seismic Pounding Analysis for Design Guideline on Clearance between Adjacent Buildings, Summaries of Technical Papers of Annual Meeting Architectural Institute of Japan 2015, (2015), pp. 369-370, in Japanese. abstract

T. Oya, M. Asai, K. Izuno and D. Isobe: Verification of Different Formulations for the Fluid Rigid Body Interaction Simulation by a Particle Simulation, Proceedings of the 28th JSME Computational Mechanics Conference, No.15-19, (2015), in Japanese. abstract

T. Fujiwara, D. Isobe, H. Tagawa, T. Yamashita and T. Sasaki: Numerical Simulation on Ceiling Collapse Phenomenon in Gymnasium during Earthquake, Proceedings of the 28th JSME Computational Mechanics Conference, No.15-19, (2015), in Japanese. abstract

H. Ogino, S. Tanaka and D. Isobe: Safety Evaluation of Tsunami Refuge Building by Seismic Response and Tsunami Analysis, Proceedings of the 28th JSME Computational Mechanics Conference, No.15-19, (2015), in Japanese. abstract

D. Isobe: Recent Applications of the ASI-Gauss Code on Structural Collapse and Motion Analysis, the 3rd International Workshops on Advances in Computational Mechanics (IWACOM-III), (2015), Tokyo, Japan. abstract

T. Miura, T. Yamashita and D. Isobe: Finite Element Motion Analysis of Furniture under Seismic Excitation, CD-ROM Proceedings of the Conference on Computational Engineering and Science, Vol.21, (2016), in Japanese. abstract

S. Tanaka, H. Ogino and D. Isobe: Tsunami Propagation Analysis for Damage Estimation of Evacuation Building, CD-ROM Proceedings of the Conference on Computational Engineering and Science, Vol.21, (2016), in Japanese.abstract

D. Isobe, M. Katagiri, T. Fujiwara and T. Miura: A Finite Element Approach to Analyze Motion Behaviors of Indoor Non-Structural Components of Buildings, European Congress on Computational Methods in Applied Sciences and Engineering 2016 (ECCOMAS2016), (2016), Crete, Greece. abstract

D. Isobe: A Finite Element Approach to Analyze Large-Scale Collapse Behaviors of Buildings and Motion Behaviors of Non-Structural Components, Semi Plenary Lecture, Proceedings of the 12th World Congress on Computational Mechanics (WCCM XII), (2016), Seoul, Korea. abstract

D. Isobe: Large-Scale Collapse Analyses of Buildings and Motion Analyses of Non-Structural Components within Them, Thematic Plenary Lecture, Abstracts of the International Conference on Computational Methods (ICCM2016), (2016), Berkeley, CA, USA. abstract

T. Miura, T. Yamashita and D. Isobe: Finite Element Motion Analysis of Furniture under Seismic Excitation, Proceedings of the 12th World Congress on Computational Mechanics (WCCM XII), (2016), Seoul, Korea. abstract

S. Tanaka, H. Ogino and D. Isobe: Development of Tsunami Analysis Method for Estimation of Damage of Evacuation Building by Tsunami Impacts, Proceedings of the 12th World Congress on Computational Mechanics (WCCM XII), (2016), Seoul, Korea. abstract

D. Isobe and M. Katagiri: Deformation Analysis of Door Frame in RC Frame Building during Seismic Motion, Summaries of Technical Papers of Annual Meeting Architectural Institute of Japan 2016, (2016), pp. 1185-1186, in Japanese. abstract

T. Oya, M. Asai, K. Izuno and D. Isobe: Verification and Validation of bridge Wash-Out Simulation by a Particle Based Fluid Rigid Body Interaction Method, Proceedings of the 29th JSME Computational Mechanics Conference, No.16-4, (2016), in Japanese. abstract

T. Fujiwara, D. Isobe, H. Tagawa, T. Yamashita and T. Sasaki: Seismic Motion Analysis of Gymnasium with Ceiling Considering Buckling of Hanging Bolts and Structural Braces, Proceedings of the 29th JSME Computational Mechanics Conference, No.16-4, (2016), in Japanese. abstract

T. Miura, T. Yamashita and D. Isobe:Motion Analysis of Furniture Placed in RC Building under Seismic Excitation, CD-ROM Proceedings of the Conference on Computational Engineering and Science, Vol.22, (2017), in Japanese. abstract

K. Kobayashi and D. Isobe:Motion Analysis of Quake-Proof Furniture under Seismic Excitation, CD-ROM Proceedings of the Conference on Computational Engineering and Science, Vol.22, (2017), in Japanese. abstract

K. Sato and D. Isobe:Motion Behavior Analysis of Doors in RC Buildings under Seismic Excitation, CD-ROM Proceedings of the Conference on Computational Engineering and Science, Vol.22, (2017), in Japanese. abstract

T. Ohno, S. Tanaka and D. Isobe:Collapse Analysis of Gymnasium under Tsunami Force, CD-ROM Proceedings of the Conference on Computational Engineering and Science, Vol.22, (2017), in Japanese. abstract

K. Fukushima, S. Tanaka and D. Isobe:Coupling Analysis of FEM for Fluids and DEM for a Rigid Sphere Moving in Free-Surface Flows, CD-ROM Proceedings of the Conference on Computational Engineering and Science, Vol.22, (2017), in Japanese. abstract

T. Miura, T. Yamashita and D. Isobe: Finite Element Motion Analysis of Furniture Placed in RC Building under Seismic Excitation, Summaries of Technical Papers of Annual Meeting Architectural Institute of Japan 2017, (2017), pp. 411-412., in Japanese. abstract

K. Kobayashi and D. Isobe: Verification of Quake-Proof Countermeasures on Furniture by Finite Element Analysis, Proceedings of the 30th JSME Computational Mechanics Conference, No.17-4, (2017), in Japanese. abstract

K. Sato and D. Isobe: Motion Analysis on Seismic Behaviors of Doors Considering Contact with Door Frames, Proceedings of the 30th JSME Computational Mechanics Conference, No.17-4, (2017), in Japanese. abstract

K. Kanano and D. Isobe: Motion Analysis on Seismic Behavior of Server Rack Using ASI-Gauss Technique, Proceedings of the 30th JSME Computational Mechanics Conference, No.17-4, (2017), in Japanese. abstract

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