预应力框架结构在强震作用下的抗震性能研究  

Research on seismic performance of prestressed concrete frame structures under strong earthquakes

作　　者：朴贤日 崔帅[1] 刘勇[1] 张耀庭[1] PAK Hyonil;CUI Shuai;LIU Yong;ZHANG Yaoting(School of Civil and Hydraulic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学土木与水利工程学院,湖北武汉430074

出　　处：《地震工程与工程振动》2022年第3期200-208,共9页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(52178140)。

摘　　要：随着《中国地震动参数区划图》(GB 18306-2015)中极罕遇地震作用概念的提出,有必要对按我国现设计规范的预应力混凝土(PC)框架结构在极罕遇地震作用下的抗震性能进行深入研究。为此,依据我国现规范设计了6榀不同梁截面尺寸、不同抗震等级的PC框架,在OpenSees中对其建立数值模型并对模型的适用性进行验证,然后分别对其进行静力弹塑性分析和基于IDA的易损性分析。研究表明:在罕遇,极罕遇地震作用下,各结构的最大层间位移角均能满足现规范1/50的限值要求,但容易出现“强梁弱柱”的破坏机制;结构的倒塌失效概率均较小,满足“大震不倒”的抗震设防要求;其中抗震等级为三级的PC框架抗震性能最好,具有较高的抗震能力储备;同时,在保证结构具有足够的抗震能力条件下,适当减小框架梁的截面尺寸,能较好地改善结构的破坏机制。With the introduction of the concept of extremely rare earthquakes in“Seismic ground motion parameters zonation map of China”(GB18306-2015). It is necessary to investigate the seismic performance of PC frame structures under extremely rare earthquakes. Therefore,six PC frame structures with different beam section sizes and seismic resistance grades are designed according to the current Chinese Code. The models are established in OpenSees,and the rationality is verified. On this basis,the pushover and fragility analysis on account of IDA are used to analyze the seismic performance of PC frame structures. The research shows that the maximum inter-story drift of each structure can meet the current Code’s limit requirement of 1/50 under extremely rare earthquakes. But it is prone to occur the failure mechanism of strong beam-weak column. The collapse of each structure failure probability is small through fragility analysis,meeting the seismic fortification requirement of doing not collapse under rare earthquakes. Then the seismic resistance grades of Ⅲ’s PC frame structure has the best seismic performance,and it has a high seismic resistance reserve. Meanwhile,under the condition that the structure has sufficient seismic capacity,it is recommended to reduce the beam section size appropriately,and the failure mechanism of the structure can be better improved.

关 键 词：强震 极罕遇地震 预应力混凝土框架结构 抗震性能 静力弹塑性分析 易损性分析 

分 类 号：TU378.4[建筑科学—结构工程]