キーエレメント指標と進行性崩壊の危険性との関連
Abstract
本稿では,大規模骨組構造の構造解析において部材破断や部材接触などの強非線形現象を再現可能であるASI-Gauss解析コードを用いて進行性崩壊解析を行い,建物のキーエレメント指標(以下,KI)と進行性崩壊の規模との関係を調査することを目的とする.最大軸力比が異なる複数の鋼構造建物モデルを対象として特定の柱を除去する解析を行い,崩壊の規模の大きさを崩壊前後における位置エネルギーの減少率により評価する.
In this paper, the collapse behaviors of steel framed buildings were
simulated by using the ASI (Adaptively Shifted Integration) -Gauss code to
investigate the relationship between the key element index and the risk of
progressive collapse. The progressive collapse phenomena were initiated by
removing specific columns from the models designed based upon different axial
force ratios. The total potential energy values of structural members after the
collapse were used to estimate the damage of buildings. The key element index
is a parameter which indicates the contribution of a structural column to the
vertical capacity of the structure. According to the numerical results on
various models with different structural strengths, it is confirmed that the
risks of progressive collapse tend to increase if the sum of key element index becomes
larger.