近场脉冲型地震作用下PC框架结构抗震性能分析  

SEISMIC BEHAVIOR ANALYSIS OF PRESTRESSED CONCRETE FRAME STRUCTURE UNDER NEAR-FAULT PULSED GROUND MOTIONS

作　　者：郑福聪 郭宗明[1] 张耀庭[1] ZHENG Fu-cong;GUO Zong-ming;ZHANG Yao-ting(Huazhong University of Science and Technology,School of Civil Engineering and Mechanics,Wuhan,Hubei 430074,Chin)

机构地区：[1]华中科技大学土木工程与力学学院,湖北武汉430074

出　　处：《工程力学》2018年第A01期330-337,共8页Engineering Mechanics

基　　金：国家自然科学基金项目(51278218)

摘　　要：对近场地震作用下的PC框架结构的抗震性能进行分析已成为工程中的必须,为此该文按照我国现行规范设计了两榀预应力混凝土框架,并基于OpenSees平台建立有限元模型,对所设计的框架在近场脉冲型地震和近场无脉冲型地震作用下的动力响应进行了研究。分析结果表明:罕遇地震作用下,PC框架结构的响应增幅较常遇地震作用下更大,结构进入塑性阶段时,近场脉冲型地震会比近场无脉冲型地震使PC框架结构产生更大响应;当加速度峰值相同时,罕遇地震作用下,近场脉冲型地震作用会使自振周期较长的PC框架结构产生较大响应;按我国现规范进行近场区预应力混凝土框架结构的建设时,有可能存在不安全的因素,有必要对现规范在近场区的适用性进行深入研究。It has become necessary to analyze the seismic performance of the PC frame structure under the near-fault ground motion in engineering. Two prestressed concrete frames are designed according to current standard, and the finite element models are established on the OpenSees platform. The dynamic response of the frame under the excitation of near-fault plused ground motions and near-fault non-plused ground motions is studied. The results show that： under the rare earthquakes, the response of the PC frame structure is more frequent than that of the earthquake. When the structure enters the plastic stage, the near-fault plused ground motions will cause larger response in the PC frame structure than the near-fault non-plused ground motions. When the peak ground acceleration（PGA） is the same, the near-fault plused seismic excitation will cause large response to the PC frame structure with long vibration period under rare earthquakes. It is necessary to study the applicability of the current code in the near field in the case of constructing prestressed concrete frame structures there.

关 键 词：预应力混凝土结构 近场地震 抗震性能 动力时程分析 层间位移角 剪力系数 

分 类 号：TU375.4[建筑科学—结构工程]