順応型 Shifted Integration 法による脆性骨組構造体の動的崩壊挙動の有限要素解析
Finite element analysis of dynamic collapse behaviors of brittle framed structures by the Adaptively Shifted Integration technique

Abstract


 本研究では、破断を伴う脆性骨組構造体の動的崩壊 挙動をシミュレートする有限要素解析アルゴリズム を開発し、その数値例として爆破解体解析および地 震崩壊解析に応用した。骨組構造の有限要素解 析において有効であることが立証されている順応型 Shifted Integration 法(ASI法)を使用することに より、従来の変位型有限要素法ではほとんど解析不 可能であったこれらの強非線形問題が簡単に解析で き、実用的な範囲で骨組構造の崩壊過程をリアルに 表現できることを確認した。


The Adaptively Shifted Integration (ASI) technique, which produces the highest computational efficiency in the finite element analysis of framed structures including static and dynamic collapse problems, is applied to the explosive demolition analysis and seismic damage analysis of reinforced concrete buildings. By expressing an explosion or a fracture by a plastic hinge located at the exact position with a simultaneous release of resultant forces in the element, strong non-linear and discontinuous problems such as these can be easily analyzed even by the finite element code with the displacement form. By using the algorithms described in this paper, sufficiently reliable solutions for the practical use have been obtained in the explosive demolition and seismic damage analyses of a 5 stories-5 span reinforced concrete building. The present technique can be easily implemented with a minimum effort into the existing finite element codes utilizing the linear Timoshenko beam element.