单层钢筋混凝土框架结构水平向连续倒塌试验研究  

Experimental investigation on horizontal progressive collapse of one-story reinforced concrete frame

作　　者：王浩[1] 李易[1,2] 陆新征[3] 闫维明[1,2] 管玉皓 

机构地区：[1]北京工业大学工程抗震与结构诊治北京市重点实验室,北京100124 [2]首都世界城市顺畅交通协同创新中心,北京100124 [3]清华大学土木工程安全与耐久教育部重点实验室,北京100084

出　　处：《建筑结构学报》2016年第10期65-72,共8页Journal of Building Structures

基　　金：国家自然科学基金项目(51578018);国家重点研发计划项目(2016YFC0701400)

摘　　要：钢筋混凝土(RC)框架结构因竖向构件抗侧能力不足而引起的水平向连续倒塌模式会引起破坏在更大的范围内传播,目前国内外关于RC框架结构水平向连续倒塌的研究有待深入。试验中设计了一榀非对称的单层RC平面框架,对其进行静力倒塌试验,分析了该框架在局部竖向构件失效后的水平向连续倒塌的受力机理和倒塌抗力。结果表明:RC框架在水平向连续倒塌的最终破坏形式为梁端和柱底发生塑性破坏、框架形成机构;柱对梁板水平约束的不足导致梁板在压拱机制下发生了较大的竖向位移,使得梁板内压力对该阶段的框架倒塌抗力贡献降低;梁板在悬链线机制下的倒塌抗力受柱提供的水平约束的刚度和承载力的影响,当约束不足时框架倒塌抗力随竖向位移的增大不断下降,这与既有竖向倒塌试验结果相反。Existing studies and design methods for the progressive collapse（ PC） prevention of the reinforced concrete（ RC） frame structures mainly focus on the vertical PC mode. The horizontal PC induced by the failure of vertical structural members could lead to a further widespread propagation of collapse. But the research on the horizontal PC of RC frame structures still lacks both domestically and abroad. An asymmetric planar one-story RC frame was designed and the static collapse test was conducted to analyze the mechanism and resistance of the frame to resist horizontal PC.Experimental results show that the final collapse mode of the frame is that the plastic damage formed at the beam ends and the bottom of columns,converting the statically indeterminate frame into a planar mechanism. The insufficient horizontal restraint of the column on the beams and slabs leads to a larger vertical displacement of the frame under the compressive arch mechanism,which consequently reduces the contribution of the compressive forces within the beams and slabs to the collapse resistance of the frame. The collapse resistance of the frame under the catenary mechanism is mainly determined by the stiffness and strength of the horizontal restraint of the column. When the restraint is weak,the collapse resistance of the frame under the catenary mechanism is decreased with the increase of the vertical displacement,which is distinctly opposite to the results of the existing vertical collapse tests.

关 键 词：钢筋混凝土框架 水平向连续倒塌 静力试验 倒塌机制 倒塌抗力 

分 类 号：TU375.403[建筑科学—结构工程]