基于MIDAS Gen的多层钢筋混凝土框架结构倒塌数值模拟分析

汶川地震中大量钢筋混凝土(reinforced concrete, RC)框架结构破坏严重，极震区其倒塌率却远超过多层砖混结构。2022年9月以来，四川频发地震，为重新探讨倒塌机理及抗震性能，本文研究通过实地震害及多层RC框架结构破坏形式，结合数值模型并应用MIDAS Gen有限元计算方法，研究了RC框架结构的倒塌机理、地震响应分析。结果表明：框架柱的破坏与屈服是RC框架倒塌的主要因素，模拟增设填充墙，当地震烈度达到10度时，层间位移角大约1/46,降低柱的轴压比，提高柱的破坏延性，增大结构的极限抗侧能力，起到抗震第一道防线的作用，避免整体屈服破坏。

Numerical simulation analysis of collapse of multi-layer RC frame structure based on MIDAS Gen

Many RC frame structures were severely damaged in the Wenchuan earthquake, but the collapse rate of RC frame structures in the extreme earthquake area zone far exceeded that of multi-storey brick and concrete structures. Since September 2022, frequent earthquakes have occurred in Sichuan . It is necessary to re-explore the collapse mechanism and seismic performance. In this paper, the collapse mechanism and seismic response analysis of RC frame structures are studied by field earthquake damage and failure forms of multi-storey RC frame structures, combining numerical models and using the MIDAS Gen finite element method.The results show that the damage and yielding of the frame columns are the main factors for the RC frame collapsed, the simulation of additional infill walls,when the seismic intensity reaches 10 degrees, the inter-storey displacement angle is about 1/46, which reduces the axial compression ratio of columns, improves the damage ductility of columns, increase the limit lateral capacity of the structure, have the effect of seismic first line of defense, to avoid the overall yielding damage.