既有钢筋混凝土框架原位推覆试验研究  

In-situ pushover test of an existing reinforced concrete frame

作　　者：雷拓[1] 吕西林[1] 钱江[1] 鲁亮[1] 岳健广[1] 冷巧娟[1] 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《建筑结构学报》2009年第5期23-30,共8页Journal of Building Structures

基　　金：国家重点基础研究发展计划973项目(2007CB714202)

摘　　要：为研究既有结构地震损伤和破坏的特点,利用上世纪80年代初建造的一栋3层钢筋混凝土框架结构,进行了原位推覆试验。试验以原结构切割出的一单跨单开间框架为对象,其余部分作为反力装置。鉴于外砖墙的不对称性,水平加载力分布模式由按楼层倒三角分布的地震加速度乘以对应各加载点分配质量确定。根据结构的试验破坏过程,分析了结构的破坏机理,对其抗震性能作出评价。研究结果表明:墙体不对称布置引起结构严重扭转;梁、柱铰机制均未出现;结构的破坏是以底层柱剪切破坏为特征的脆性破坏。建议对既有老建筑结构抗震评估时,必须考虑梁、柱剪切破坏模式,并考虑楼板及墙体刚度的参与作用。In order to study the seismic damage and failure patterns of aged existing building structures under earthquake, an in-situ pushover test was performed recently early while 80＇s of last centenary. A single span, single bay frame on a three-story reinforced concrete frame building built in cut from the original structure was taken as the test object the rest part was used as providing loading reaction. Considering unsymmetrical distribution of the brick walls, a loading pattern was scheduled using distributed mass at each loading point muhiplied by seismic acceleration in inverted triangular distribution. The process of structural failure was reported, its intrinsic mechanism was analyzed, and the assessment on its seismic performance was given. It is shown that the torsional responses are obvious because of the unsymmetrical layout of brick wall, and realistic plastic hinge is not observed at the end of columns and beams. It is concluded that the final breakdown of the structure would be due to brittle type characterized by shear failure of the first story columns. It is suggested that shear failure models of beams and columns as well as rigidity of slab and brick wall must be taken into account for a reliable evaluation on seismic performance of aged existing building structures.

关 键 词：既有结构 原位推覆试验 破坏机理 抗震性能 

分 类 号：TU375.4[建筑科学—结构工程] TU317.2