기둥 전단변형에 대한 고려가 철골 특수모멘트골조의 붕괴위험도 평가에 미치는 영향

초록

Nonlinear numerical models to be used for seismic performance evaluation are generally constructed based on measured seismic behavior ofstructural members and systems. The shear deformation in a column member has been typically considered insignificant in the inelastic range. However, an increase in lateral drifts due to the inclusion of shear deformation may impact the degree of damage in structural members andthe onset of collapse. Therefore, for a column member, it is important to include the shear deformation in column numerical models as itcan have a significant impact on predicting the structure’s response. The aim of this study is to evaluate the effect of column sheardeformation on the collapse risk of steel special moment frames (SMFs). Numerical models were constructed with and without consideringcolumn shear deformation. It was shown that column shear deformation had a significant effect on the lateral stiffness of the steel SMFs andincreased in moment demand due to the P-Delta effect. Such increase in moment demands could affect the collapse mechanism of steelSMFs under seismic loads. Without considering the shear deformation, the collapse risk of SMFs may be also underestimated.

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