协同式套建增层框架时程分析及防倒塌措施

郑文忠, 张昊宇

哈尔滨工业大学土木工程学院



摘要:

针对如何确保协同式套建增层框架"大震不倒"这一问题,采用IDARC(2D)非线性分析程序对协同式套建增层框架进行罕遇地震作用下的非线性时程分析.结果表明,协同式套建增层框架的薄弱层多在新增楼盖以下楼层;部分既有结构在罕遇地震作用下的破坏程度重于新增结构;部分按照规范设计的协同式套建增层结构在罕遇地震作用下发生了倒塌破坏.根据计算结果提出了协同式套建增层框架的适用范围、外套框架柱轴压比限值和柱端弯矩增大系数以及相关构造措施,时程分析表明采用以上措施的结构能够做到"大震不倒".

关键词:  罕遇地震  套建框架  时程分析  防倒塌措施

DOI：10.11918/j.issn.0367-6234.2011.04.002

分类号:TU352.11

基金项目:“十一五”国家科技支撑计划项目(2006BAJ03A10-7);国家教育部****奖励计划项目(2009-37)



Time-history analysis & anti-collapse construction of storey-adding out-jacketing frame cooperated with the existing structure

ZHENG Wen-zhong, ZHANG Hao-yu

School of Civil Engineering,Harbin Institute of Technology,150090 Harbin,China

Abstract:

To ensure the anti-collapse capacity of the storey-adding out-jacketing frame cooperated with the existing structure,time-history analysis by IDARC(2D) on the out-jacketing frame under rear earthquake are carried out,which shows that the lateral stiffness of the frame is quite weak below the adding structure;the damages of the existing structure is more serious than the one of the adding structure;and some of the out-jacketing frame designed by Code for design of concrete structures(GB50010—2002) & Code for seismic design of buildings(GB50011—2002) collapse under rear earthquake.Based on the analysis,application limits,column axial compression ratio limits,end-column moment magnification factors and construction measure of the out-jacketing frame are presented.Time-history analysis shows that by these reinforcing measures,collapse of the out-jacketing frame can be prevented effectively.

Key words:  rear earthquake  out-jacketing frame  time-history analysis  anti-collapse construction