含软弱层大空间混凝土框架结构振动台试验  

Shaking table test of large-space RC frame structure with soft layer

作　　者：信任[1,2] 毛立 毕登山 陈动 XIN Ren;MAO Li;BI Dengshan;CHEN Dong(School of Civil Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China;Key Lab of Structural Engineering and Earthquake Resistance,Ministry of Education(XAUAT),Xi'an 710055,China;Central Research Institute of Building and Construction Co.,Ltd.,MCC Group,Beijing 100088,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]西安建筑科技大学结构工程与抗震教育部重点实验室,陕西西安710055 [3]中冶建筑研究总院有限公司,北京100088

出　　处：《建筑结构学报》2021年第9期22-30,43,共10页Journal of Building Structures

基　　金：国家自然科学基金项目(51978562);“十三五”国家重点研发计划(2016YFC0701306)。

摘　　要：为研究现阶段存量较大的大型公共建筑结构强震作用下地震响应和抗震性能,针对一含软弱层的大空间RC框架结构,设计了几何相似比为1∶6的模型,开展设防烈度下多种激励的模拟地震动试验。通过对模型破坏形态、动力性能、加速度与位移响应等指标的测试分析,研究大空间混凝土(LRC)框架结构相对常规混凝土框架结构在动力响应与变形特征等方面的差异。试验研究与分析结果表明:LRC框架结构的损伤集中在软弱层,其柱端抗弯能力对整体结构的抗震性能影响最大;楼层加速度和相对位移经软弱层传递后易发生突变,LRC框架结构相对常规结构呈现出更明显的整体弯曲特征;含软弱层的LRC框架结构破坏等级的划分所依据的层间位移角限值相对常规RC框架结构需提高一级。In order to study the seismic response and seismic performance of large-space public buildings with large stocks at present, the shaking table test considering various seismic excitations were carried out on a 1∶6 scaled model designed based on a large-space public reinforced concrete(LRC) frame structure with a soft layer. By examining the failure modes, dynamic performance, acceleration and displacement responses, the differences of the dynamic response and deformation characteristics between the LRC frame structure and a conventional concrete frame structure were mainly studied. As shown from the experimental research and analysis results, the damages of the LRC structure are concentrated in the soft layer, and the bending resistance of the columns has the greatest influence on the seismic-resisting capability of the structure. In addition, floor acceleration and relative displacement are changed significantly due to the presence of the soft layer, and the LRC structure exhibits more obvious overall bending characteristics compared with the conventional reinforced concrete(RC) structure. Moreover, the story drift limitation of the LRC structure is comparatively more strict and the division of each damage grade should be one level higher than that of conventional RC structure.

关 键 词：大空间混凝土框架 软弱层 振动台试验 动力响应 抗震性能 破坏等级 

分 类 号：TU375.4[建筑科学—结构工程] TU317.1