钢管混凝土格构柱-组合箱梁节点抗震性能试验研究

摘要

为验证巨型组合结构体系中钢管混凝土格构柱-组合箱梁节点的破坏特征和抗震性能，进行了节点核心区连接分别为单肢斜撑、交叉斜撑和横隔板三种不同连接构造形式的节点低周反复循环加载试验。分析了各节点形式的荷载-位移滞回曲线和骨架曲线及评价节点抗震性能的主要参数（承载力、延性、刚度退化规律、耗能指数和等效粘滞系数等）。同时，利用ABAQUS对各节点进行了有限元数值计算，并与试验结果进行对比分析进一步对组合节点进行了研究。结果表明：试验与有限元数值计算结果吻合良好，验证了理论分析的正确性；三种不同连接构造形式的节点试件正向具有良好的位移延性，但反向位移延性不及正向，随着节点连接方式的加强，节点的屈服位移逐渐减小，延性增大，节点承载能力逐渐增大。横隔板连接形式节点相对另两种连接构造耗能能力较好，改善了节点的抗震性能。%In order to verify the destruction characteristics and aseismic performance of joints composed of concrete-filled steel tubular lattice columns and composite box girders in a mega-composite structure system,three different-connection types of joint specimens including single limb bracing,cross bracing and diaphragms for the core area of joints were tested under low cyclic and reciprocating loading.According to the comparison of the results,load-displacement hysteretic curves and skeleton curve were obtained.Moreover,main parameters for estimating aseismic behavior of the connections with composite joints,such as,load-carrying capacity,ductility ratio,degradation laws of strength and stiffness,energy consumption index and equivalent viscous coefficient were studied.Meanwhile,ABAQUS nonlinear finite element model was used to analyze the aseismic behavior of the connections and the results were compared with the experimental data.The results showed that the FE numerical results agree well with experimental data,the theoretical analysis is proved to be correct;meanwhile,the three connections have a good positive displacement ductility,their reverse displacement ductility is not as good as their positive displacement ductility;with the connecting of joints reinforced,the joints' yield displacement gradually decrease and their load-bearing capacity and displacement ductility gradually increase;in addition,the joint connection with diaphragms has a better energy dissipation capacity.Those properties could make connections consume more energy under earthquake and meet the needs of aseismic design.