主余震序列地震作用下一级抗震预应力型钢混凝土空腹桁架转换层框架结构抗震性能研究  

RESEARCH ON SEISMIC PERFORMANCES OF FIRST ASEISMIC GRADE FRAMES WITH PSRC VIERENDEEL TRUSS TRANSFER STORIES UNDER MAIN-AFTER SHOCKS

作　　者：陈勇 简斌 刘冲[2,3] CHEN Yong;JIAN Bin;LIU Chong(Dongguan Daye Construction Drawings Review Co.,Ltd.,Dongguan 523000,China;Key Laboratory of New Technology for Construction of Cities in Mountain Area of the Ministry of Education,Chongqing University,Chongqing 400045,China;School of Civil Engineering,Chongqing University,Chongqing 400045,China)

机构地区：[1]东莞市大业施工图审查有限公司,广东东莞523000 [2]重庆大学山地城镇建设与新技术教育部重点实验室,重庆400045 [3]重庆大学土木工程学院,重庆400045

出　　处：《工业建筑》2021年第8期45-52,105,共9页Industrial Construction

基　　金：国家自然科学基金面上项目(52078078)。

摘　　要：基于"三道防线抗震设防"的设计方法,以2榀8度(0.2g)设防区的上抬层数不同的一级抗震预应力型钢混凝土(PSRC)空腹桁架转换层框架结构为研究对象,完成了罕遇烈度水准下不同余震主震强度比■_(PGA)=0,0.5,0.8,1.0的系列弹塑性时程分析。然后,通过层间位移角、转动能力需求比和损伤指数等多个性能指标,对构件、防线以及结构整体等不同层次的抗震性能和损伤状况进行研究。结果表明:在主震及主余震序列地震作用下,结构均未发生整体破坏,当余震较强时,以损伤指数计算的个别上抬框架梁出现局部破坏;结构后续两道防线的损伤明显小于第一道防线,形成主要以第一道防线内梁铰耗能的"梁柱混合出铰机制","三道防线抗震设防"的设计原则得以实现;余震作用下,结构的整体损伤指数显著增加,且"二次损伤"明显;较大余震下,转换柱出铰普遍,甚至出现"层侧移机制",应加强转换柱柱端弯矩增大措施。Based on the design method of"three-line defenses seismic fortification",two pieces of first aseismic grade frames with PSRC vierendeel truss transfer story and different numbers of the upper stories were designed under eight degree(0.2g)of seismic fortification level,and a series of elastic-plastic time-history analysis had been completed under rare intensity level of different intensity aftershocks■_(PGA).After that,the seismic performance and damage of components,defenses,and structures were studied with inter-story drift ratios,ratios of demand to capacity of plastic hinge rotation,damage indexes and others.The results showed that the structures could avoid overall damage under the main-after shocks,and the damage indexes of a few upper beams appeared local damage when the aftershocks were strong;a"beam-column mixed hinge mechanism"could be formed to dissipate energy mainly with the beam hinges in the first line defense,and the damage indexes of the last two defenses were obviously smaller than the first one,so the design principle of"the three-line defenses seismic fortification"could be realized.Under the aftershocks,the overall damage indexes of structures increased significantly,and"the secondary damage"caused by the aftershocks were obviously;under larger aftershocks,hinges in the transfer columns were more widespread,and even a"mechanism of story lateral displacement"occured,so it was necessary to strengthen the moment magnifying measures of the transfer columns.

关 键 词：预应力型钢混凝土 空腹桁架转换层 主余震地震动 损伤指数 弹塑性时程分析 

分 类 号：TU352.11[建筑科学—结构工程] TU392.1