钢板混凝土组合剪力墙拉弯性能研究  

Research on tension-bending performance of steel plate concrete composite shear walls

作　　者：范重[1] 王金金[1] 王义华[1] 聂建国[2] 樊健生[2] 汪家继[2] 胡海波 

机构地区：[1]中国建筑设计研究院,北京100044 [2]清华大学土木工程系,北京100084 [3]绿地集团宁夏置业有限公司,宁夏银川750001

出　　处：《建筑结构学报》2016年第7期1-9,共9页Journal of Building Structures

基　　金：中国建设科技集团股份有限公司科技创新基金项目(Z2014J09)

摘　　要：在地震作用下超高层建筑核心筒底部墙体会承受较大的轴向拉力,为此采用Marc有限元软件建立钢板混凝土组合剪力墙弹塑性有限元分析模型,对钢板混凝土组合剪力墙拉弯受力状态下的抗震性能进行了深入研究。提出拉弯构件轴拉比的定义方法,考察轴拉比大小对钢板混凝土组合剪力墙抗侧刚度、滞回曲线、等效黏滞阻尼系数、位移延性系数、变形能力以及承载力的影响。在拉弯受力时,钢板混凝土组合剪力墙达到极限变形时承载力下降不明显,滞回曲线饱满,变形能力较强;轴拉比越大,承载能力越低,位移延性系数越小;当轴拉比大于0.2时,初始抗侧刚度下降50%以上。随着水平往复荷载逐渐增大,抗侧刚度不断降低。所完成的钢板混凝土组合剪力墙在低周往复荷载下的缩尺模型试验结果表明,拉弯受力破坏时,试件表面出现多条水平贯通裂缝,最终根部钢筋拉断,承载力和极限变形能力与弹塑性有限元分析结果吻合良好。钢板混凝土组合剪力墙具有良好的承载力与变形性能,是解决超高层建筑墙体在地震作用下承受轴向拉力的有效形式。As large tensile stress may occur in the bottom core tube walls of high-rise buildings, elasto-plastic finite element analysis model of steel plate concrete composite shear walls （SPCW） were established to fully study the seismic behavior of SPCW under tension-bending condition. Axial tension ratio definition was proposed and influences of axial tension ratio on SPCW were researched including lateral stiffness, hysteretic curve, equivalent viscous damping coefficient, displacement ductility factor, deformation capacity and bearing capacity. Under tension-bending stress, bearing capacity of SPCW has no obvious decrease at ultimate deformation and SPCW has full hysteretic curves and large deformation ability. The SPCW bearing capacity and displacement ductility factor decrease with the increase of tension ratio. When the tension ratio is greater than 0.2, initial lateral stiffness is decreased by more than 50%. The lateral stiffness decreases with the increase of reversed horizontal loading. Results of sealed SPCW specimen tests under low-cycle and reverse horizontal loading show that multiple horizontal through-depth cracks appear on the specimen surface and rebars fracture at root finally. The measured SPCW bearing and ultimate deformation capacities agree well with the elasto-plastic finite element analysis. The SPCW has good bearing and deformation capacities and can become an effective method to solve the excessive tension stress under earthquake action in super high-rise buildings.

关 键 词：钢板混凝土组合剪力墙 拉弯受力 弹塑性有限元分析 拟静力试验 承载力 抗震性能 

分 类 号：TU973.14[建筑科学—结构工程] TU398.2