卷边PEC柱-钢梁(BRS)端板连接组合框架中间层抗倒塌机理数值模拟  

Numerical Simulation of Interstory Collapse-prevention Mechanism of Crimping PEC Column(Weak Axis)-Reduced-Section Steel Beam Composite Frame

作　　者：包张君 方有珍[1] 沈晓明 王玉玺[1] 王辰宇[1] 

机构地区：[1]苏州科技学院江苏省结构重点实验室,江苏苏州215011 [2]苏州市吴中建筑工程施工图审查中心,江苏苏州215128

出　　处：《防灾减灾工程学报》2016年第2期239-246,共8页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(51078247;51478286);江苏省"青蓝工程"中青年学术带头人(2014);江苏省高校首批优秀中青年教师出国研修计划(2011)资助

摘　　要：为研究卷边PEC柱-钢梁组合框架中间层抗倒塌机理,以采用端板预拉对穿螺栓连接的新型卷边钢板组合截面PEC柱(弱轴)-钢梁(BRS)组合框架中间层子结构试验试件作为研究对象,利用有限元软件ABAQUS对其进行水平低周往复荷载下倒塌机理的数值模拟。基于计算数据,对比分析试件承载力、抗侧刚度、连接性能、耗能能力、剪力分配、变形模式、节点传力机理和破坏机构等抗震性能。结果显示:试件具有较大的承载能力和初始抗侧刚度;卷边PEC框架柱平均分担层间水平剪力,层间变形表现为剪切型变形模式;预拉对穿螺栓实现了部分自复位功效,而梁截面削弱满足了连接的转动能力和结构耗散地震能的需求;试件最终破坏模式为梁端削弱截面处出现塑性铰而使结构形成塑性机构,相应连接转角和试件中间层层间剪切角均超过中震层间侧移限值1/50,表明该结构体系具有良好抗震延性和抗倒塌性能。To investigate collapse prevention mechanism of innovative PEC（Partially Encased Composite）column-steel beam composite frame system,the test specimen of inter-story substructure of crimping PEC column（weak axis）-reduced-section steel beam composite frame with end plates and pretension high-strength penetrating bolts connection were taken as an object,the software ABAQUS was adopted to simulate its collapse mechanism under quasi-static lateral cyclic loading.Based on the analysis data,the specimen′s performance was analyzed,including load-carrying capacity,degradation of lateral stiffness,connection mechanical performance,shear distribution,deformation mode,force-transfer of joint and failure mechanism.The results indicate that the specimen has high strength and initial lateral-resisting stiffness;the inter-story shear is evently sustained by PEC columns and the deformation is induced by shearing;all joints exhibit partial self-centering function resulting from pre-tension penetrating bolts,and reduced-section steel provides rotational capacity and energy-dissipation capacity;the collapse is primarily induced by plastic hinge in reduced cross-section of steel beam,and connection rotation and interstory drift both surpass the limit（1/50）of design-basis earthquake for structure,and the specimen has ductility and collapse prevention capacity.

关 键 词：卷边PEC柱 组合框架中间层子结构 抗震机理 水平低周反复荷载 数值模拟 

分 类 号：TU398.2[建筑科学—结构工程]