摘要
为研究半刚接钢框架内填RC墙结构的抗震性能,提出了一种考虑内填墙边界条件的子结构模型,进行了3榀1/3缩尺的3层单跨半刚接钢框架内填RC墙子结构的低周往复加载试验,研究了不同构造内填RC墙对结构抗震性能的影响,得到了试件的滞回曲线、骨架曲线、位移延性系数、刚度退化、耗能能力及水平剪力分配。试验结果表明:内填贯通竖缝RC墙及暗竖缝RC墙试件的滞回曲线饱满,耗能能力强,但水平承载力及抗侧刚度略低,破坏模式均为缝间墙的弯曲破坏;内填实体RC墙试件的滞回曲线捏缩明显,耗能能力较弱,但水平承载力及抗侧刚度较高,破坏模式为内填墙的剪切破坏;内填墙降低了地震作用下周边框架节点转动能力,半刚性节点的最终塑性转角不超过0.025 rad,可避免钢框架节点失效导致的脆性破坏。内填墙承担约80%的水平荷载,但随着水平荷载的增大逐渐降低。
To investigate the seismic behavior of partially-restrained steel frame with RC infill walls,an innovative subassemblage was proposed to consider the influence of boundary condition on the infill walls reasonably. Three 1 /3scale,one-bay and three-story test specimens were carried out under low cycle reversed test,and the effect of infill walls type on structural performance was studied. The hysteretic curves, skeleton curves, ductility, stiffness degradation,energy dissipation,and the distribution of lateral shear were obtained. Test results reveal that test specimens with slit RC walls and concealed vertical slit RC walls take on the significant full hysteretic curves,and high deformability and energy dissipation,but small lateral strength and stiffness. Both test specimens produce flexural failure mode of slit wall. Test specimen with solid infill walls has narrow hysteretic curve,low deformability and energy dissipation,but high lateral strength and stiffness,which takes on the shear failure mode of infill walls. The employment of infill walls decreases the rotation requirement of connection resulting from earthquake. During the test,the maximum connection rotation angles of three specimens are no more than 0. 025 rad,which can avoid the brittle failure of surrounding steel frame due to connection failure. The infill walls sustain approximately 80% lateral strength at initial loading stage,and with the lateral strength increase this ratio gradually decreases.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2014年第10期21-30,共10页
Journal of Building Structures
基金
国家自然科学基金项目(51108292)
中国博士后科学基金项目(2013M531267)
江苏省结构工程重点实验室基金项目(ZD1003)
江苏省"青蓝工程"优秀青年骨干教师资助项目
关键词
半刚接钢框架
内填墙
子结构
拟静力试验
抗震性能
partially-restrained steel frame
infill wall
subassemblage
low reversed cyclic test
seismic behavior
