短剪切型耗能段的力学性能试验研究  

Experimental study of the mechanical property for very short shear link

作　　者：曾思智 张波[3] 刘超[3] 罗海平 胡淑军[3] Zeng Sizhi;Zhang Bo;Liu Chao;Luo Haiping;Hu Shujun(Canzhou Construction Industrialization Co.Ltd,Ganzhou 341007,China;Zhongmei Engineering Group Ltd,Nanchang 330001,China;School of Infrastructure Engineering,Nanchang University,Nanchang 330031,China)

机构地区：[1]赣州建筑工业化有限公司,江西赣州341007 [2]江西中煤建设集团有限公司,江西南昌330001 [3]南昌大学工程建设学院,江西南昌330031

出　　处：《建筑科学》2023年第11期72-81,共10页Building Science

基　　金：国家自然科学基金项目(51908268);江西省地质局青年科学技术带头人培养计划项目(2022JXDZKJRC09);江西省自然科学基金项目(20224BAB204062)。

摘　　要：长度比小于1.0的短剪切型耗能段与普通剪切型耗能段的力学性能存在较大差异。基于Q345钢材,设计3个考虑加劲肋间距和加劲肋布置方式的短剪切型耗能段试验模型,并进行低周往复加载试验研究,得到其破坏模式、滞回曲线、骨架曲线、割线刚度、耗能能力和等效黏滞阻尼系数等。试验结果表明,各试件均经历受剪屈服、腹板屈曲、翼缘屈曲、腹板开裂、翼缘开裂、翼缘-端板和腹板-端板断裂破坏六个阶段。各试件超强系数和塑性转角最大值分别为1.85和0.15,明显高于规范允许值1.50和0.08。加劲肋布置方式对试件力学性能无明显影响,但放宽加劲肋间距会明显增大腹板的屈曲现象,并降低其承载能力、塑性转角、割线刚度和耗能能力等,建议设计时加肋劲间距需满足规范要求。基于ABAQUS软件对短剪切型耗能段进行模型有限元分析,可较准确地模拟其滞回曲线和破坏模式,并用于相应构件的参数化分析中。Recent researches indicate that there are great differences in the mechanical properties between very short shear link(VSSL)with length ratio lower than 1.0and ordinary shear link.Cyclic loading tests are carried on three VSSL specimens with stiffener spacing and placing,which are based on the material properties of Q345,so the failure modes,hysteresis curves,bond curves,secant stiffness,energy dissipation capacity and energy dissipation coefficient can be investigated.The test results show that all the specimens have experienced failure mode of web yield,web buckling,flange buckling,web crack,flange crack,fracture between flange and endplate,and fracture between web and endplate.The maximum overstrength and inelastic rotation of the specimens are 1.85and 0.15,respectively,which are much greater than the requirements of current specification.The stiffener placing has no significant effect on the mechanical property of the VVSL,but increase of the stiffener spacing will obviously improve the web buckling of VSSL,while the bearing capacity,inelastic rotation,secant stiffness and energy dissipation capacity have simultaneously decreased,so the stiffener spacing of VSSL is recommended to satisfy the specification.Finally,the numerical method with ABAQUS software can be accurately simulated the failure modes and hysteresis curves of VSSL,which can provide the theoretical basis for the finite element parametric modeling and analysis.

关 键 词：短剪切型耗能段 力学性能 超强系数 滞回曲线 加劲肋 

分 类 号：TU391[建筑科学—结构工程]