设置高延性水泥基复合材料后浇区的墙-梁平面外节点抗震性能试验及损伤分析  

Seismic performance test and damage analysis of out-of-plane wall beam joints with engineering cementitious composites post cast zone

作　　者：崔涛 何浩祥[1] 周大兴 程时涛 CUI Tao;HE Haoxiang;ZHOU Daxing;CHENG Shitao(Beijing Laboratory of Earthquake Engineering and Structure Retrofit,Beijing University of Technology,Beijing 100124,China;Department of Civil Engineering,Tsinghua University,Beijing 100084,China;China Railway Construction Group Co.,Ltd,Beijing 100040,China)

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]清华大学土木工程系,北京100084 [3]中铁建设集团有限公司,北京100040

出　　处：《建筑结构学报》2023年第3期49-58,共10页Journal of Building Structures

基　　金：国家重点研发计划(2017YFC1500600)。

摘　　要：为研究设置高延性水泥基复合材料(ECC)后浇区的墙-梁平面外节点的抗震性能,考虑墙内钢筋预埋方式、节点区钢筋连接方式、剪跨比、板宽度等因素,设计了7个装配式节点及1个对比节点并进行了拟静力试验,得到该类节点的破坏形态、滞回性能、承载力、刚度退化、耗能能力等,并采用四种损伤模型对其损伤演化过程进行分析。试验及损伤模型分析结果表明:节点以梁端弯曲破坏为主,墙破坏轻微;后浇区采用ECC可以有效提高节点的延性与承载力;墙内钢筋采用双层预留焊接锚板的连接方式优于采用横向钢筋约束;后浇区内钢筋采用弯起钢筋搭接、弯钩钢筋连接、套筒连接等形式均能有效传递钢筋应力;弹塑性耗能差模型能较好反映加载过程中节点的损伤状态,应用方便且计算结果更为精确。In order to study the seismic behavior of out-of-plane wall-beam joints with engineering cementitious composites(ECC) post cast zones, seven prefabricated specimens and one comparative specimen were designed and loaded considering the factors of embedded mode of reinforcement in the wall, connection mode of reinforcement in the joint area, shear span ratio, and slab width. The failure mode, hysteretic performance, bearing capacity, stiffness degradation and energy dissipation capacity of the joint were analyzed, and the damage process was analyzed by four models. The results show that: the main failure mode of the specimen is bending at the end of the beam, and the wall is slightly damaged;ECC can effectively improve the ductility and bearing capacity of the specimen in the joint area;double-layer reserved welding anchor plate in the wall is better than transverse reinforcement restraint;using bending reinforcement lap, hook reinforcement connection and sleeve connection in the post cast area can effectively transfer the stress of the reinforcement;the plastic energy dissipation model can better reflect the damage state of the specimen during loading. The application is convenient and the calculation result is more accurate.

关 键 词：装配式混凝土结构 墙-梁平面外节点 高延性水泥基复合材料 拟静力试验 抗震性能 损伤因子 

分 类 号：TU375.03[建筑科学—结构工程]