基于子结构的薄钢板PEC柱-钢梁组合框架层间倒塌机理分析  

Analysis on Collapse Mechanism of PEC Column Fabricated with Thin-walled Built-up Section—Reduced-section Steel Beam Composite Frame Substructure

作　　者：王辰宇[1] 戴雅萍[1,2] 方有珍[1] 赵宏康 包张君 

机构地区：[1]苏州科技学院江苏省结构重点实验室(土木工程学院),江苏苏州215011 [2]苏州市设计研究院有限公司,江苏苏州215021

出　　处：《工程抗震与加固改造》2015年第4期36-45,共10页Earthquake Resistant Engineering and Retrofitting

基　　金：国家自然科学基金项目(51078247;51478286);江苏省自然科学基金(BK2009558);江苏省结构重点实验室开发基金(ZD0905);江苏省"青蓝工程"中青年学术带头人资助;江苏省高校首批优秀中青年教师出国研修计划

摘　　要：为揭示薄钢板组合截面部分外包混凝土组合PEC柱-钢梁组合框架中间层倒塌机理,本文利用商业有限元软件ABAQUS,对采用预拉对穿螺栓端板狗骨式连接的薄钢板组合截面PEC柱-钢梁组合框架中间层子结构试验试件建模,并进行水平低周往复荷载下抗震性能的有限元分析。基于计算结果,分析试件结构的承载力与抗侧刚度、节点连接转动性能、耗能能力、剪力分配、变形模式、节点区传力机理和破坏模式等抗震性能。研究结果表明:试件具有较高的承载力和较大的初始抗侧刚度;PEC柱平均分担试件层间水平剪力;预拉对穿螺栓表现出部分自复位功效;梁端截面削弱实现了塑性铰位置远离节点区,且保证了连接具有良好的转动能力和结构耗散地震能能力;试件最终破坏模式为所有梁端削弱截面形成塑性铰的塑性倒塌机构,对应节点连接转角和层间剪切角均满足中震层间侧移限值1/50要求,表明该结构体系具有良好的耗能能力和抗倒塌性能。To study collapse mechanism of PEC column-steel beam composite frame system,the test specimen of PEC column fabricated with thin-walled built-up section-reduced-section steel beam composite frame substructure are taken as investigating subject,the software ABAQUS is utilized to analyze its seismic performance under low cyclic lateral loading. Based on the analysis data,the specimen＇s performance are analyzed,including the loading-carrying capacity,degradation of lateral stiffness,connection mechanical performance,shear distribution pattern,deformation mode,force-transfer of joint and failure mechanism. The results indicate that the specimen processes high strength and initial lateral-resisting stiffness; interstory lateral shear is sustained by PEC columns evenly; all joints capture partial self-centering function due to pre-tension penetrating bolts; reduced-section of beam make plastic hinge leave from the join zone to provide soundly rotational capacity and energy-dissipation capacity; the collapse mechanism primarily induced by plastic hinge in reduced cross-section of steel beam,and connection rotation and interstory drift both surpasses the limit（ 1 /50） of design-basis earthquake for structure,correspondingly the specimen owns soundly ductility and collapse prevention capacity.

关 键 词：PEC柱组合框架 子结构 有限元分析 水平低周往复荷载 倒塌机理 

分 类 号：TU398.9[建筑科学—结构工程] TU312.3