摘要
为研究分布式连接全装配RC楼盖(DCNPD)板缝节点在拉剪复合作用下的受力性能,进行了12个板缝节点在纯剪和拉剪复合作用下受力性能试验,对板缝节点的承载能力、裂缝模式、破坏形态、位移延性和应变规律等进行了较为系统的研究。结果表明:拉力的存在减小了由剪切作用引起的连接件与相邻混凝土间的承压作用,致使板缝节点抗剪承载力不同程度的降低,并且拉剪比越大,拉力对板缝节点屈服荷载和峰值荷载的削弱作用越明显;拉剪复合作用下,板缝节点较早呈现出非线性受力特征;拉力对板缝节点位移延性有较大的削弱,尤其对于楼盖中高拉剪比区域应采取措施避免节点发生脆性破坏;综合考虑板缝节点的荷载-位移响应、位移延性特征和破坏模式等因素,HPC、CPC和HP-CPC三种节点是较为理想的DCNPD板缝节点形式,SPC锚筋与锚板间焊缝在拉剪复合作用下易发生断裂,需改进措施以提高其拉剪复合受力性能。
An experimental program consisting the prototype tests of selected twelve slab connections was conducted to evaluate the mechanical behavior of the proposed slab connections used in discrete connected precast RC diaphragms(DCNPD)under combined shear with tension loading.The performance of test specimens was evaluated in terms of shear bearing capacity,crack and failure mode,ductility,strain response,etc.The test results indicated that:1)due to the presence of tension,the compressive force resulting from the shear demand was reduced to a certain decreased magnitude,and as the tension to shear force ratio increased,the shear bearing capacity decrease the effect of slab connection become more evident;2)due to the presence of tension,the progress into nonlinear stage of the slab connection was accelerated;3)and also,the shear deformation ductility of slab connection decreased due to the existing of tension,especially for the connections in high tension to shear force ratio area,and proper measures should be adopted to avoid brittle failure.According to the performance of slabs in force-deformation responses,in ductility,and in failure model,the three connections named HPC,CPC and HP-CPC are ideal slab joints for DCNPD,but welds between the anchor bar and anchor plate of SPC connections are inclined to fracture under combined loading,and proper measures should be used to improve its property.
作者
庞瑞
许清风
梁书亭
朱筱俊
PANG Rui;XU Qing-feng;LIANG Shu-ting;ZHU Xiao-jun(College of Civil Engineering and Architecture,Henan University of Technology,Zhengzhou 450001,China;Shanghai Key Laboratory of New Technology Research on Engineering Structure,SRIBS,Shanghai 200032,China;College of Civil Engineering,Southeast University,Nanjing 210096,China)
出处
《工程力学》
EI
CSCD
北大核心
2018年第10期112-123,共12页
Engineering Mechanics
基金
国家自然科学基金项目(51778214)
河南省科技攻关项目(152102210066)
河南省高等学校青年骨干教师资助项目(21420031)
河南省高等学校重点科研项目(17A560003)
河南工业大学高层次人才基金项目(21420004)
关键词
分布式连接
全装配式RC楼盖
板缝连接节点
拉剪复合受力性能
试验研究
discrete connection
untopped precast RC floor diaphragm
slab joint connection
mechanical behavior under combined shear with tension
experimental study
