钢筋混凝土板柱结构抗倒塌性能试验研究  

Experimental study on collapse performance of a RC flat plate frame structure

作　　者：易伟建[1] 张凡榛[1] 

机构地区：[1]湖南大学土木工程学院,湖南长沙410082

出　　处：《建筑结构学报》2012年第6期35-41,共7页Journal of Building Structures

基　　金：国家自然科学基金项目(51078133)

摘　　要：对一单层2×2跨的钢筋混凝土板柱结构进行连续倒塌模拟试验研究,模型缩尺比为1∶2.34。通过静载试验来模拟板柱结构下层中柱失效。在板面预加2倍标准荷载的重力荷载,采用静力方式卸除中柱考察板柱结构抗倒塌性能。随后对中柱施加向下的集中力直至破坏,模拟板柱结构在均布荷载和上柱传力下的倒塌过程。研究结果表明:楼面荷载主要通过板的挠曲和薄膜作用传递。平板历经弹性阶段、压力薄膜阶段和拉力薄膜阶段。基于常规设计,通过完善构造措施等,可以保证中间区格钢筋混凝土板柱结构在经历中柱破坏后仍具有足够的抗连续倒塌能力。A quasi-static experimental method was proposed to simulate the sudden column loss in an existing one-story 2×2 bay reinforced concrete flat plate frame structure.In the experiment,the interior column of the frame was replaced by mechanical jack to simulate its failure,2 times characteristic value of load were applied to the plate,and then unloaded the jack step by step until the vertical displacement of the interior column reached the thickness of plate.The load carrying capacity was enhanced due to the compressive membrane action.Finally,the flat plate load mechanism transfers to tension membrane action.Based on the experimental results,the failure-mechanism of structure was analyzed,the collapse-resistant of flat plate was explored and compressive membrane /tensile membrane action of flat plate was discussed.This paper exhibits an experimental method of collapse resistant performance of flat plate frame.The collapse-resistant capacity of flat plate frame constructed based on conventional design can be achieved.

关 键 词：无梁楼板 钢筋混凝土框架 压力薄膜 拉薄膜 连续倒塌 倒塌试验 悬索 塑性铰线 

分 类 号：TU398.1[建筑科学—结构工程] TU317.1