螺栓连接方钢管混凝土柱-钢梁组合框架结构拟静力有限元分析
Quasi Static Finite Element Analysis of Concrete-Filled Square Steel Tubular Column-Steel Beam Composite Frame Structure with Bolt Connections
本文应用ABAQUS软件建立了1层1跨螺栓连接方钢管混凝土柱-钢梁组合框架结构的三维精细有限元模型来进行拟静力分析,螺杆、螺母等细小构件都采用实体建模。模型充分考虑了钢管对核心混凝土的约束作用、螺杆与螺母的预紧力作用以及螺栓与T形件、钢管、钢梁的摩擦接触作用,模型分析的破坏形态、荷载-位移滞回曲线、刚度退化-位移曲线等计算结果与已有拟静力试验结果符合较好。在此基础上,进一步分析了组合框架结构的螺栓滑移情况、柱轴压比、钢管横向变形系数、核心混凝土应力-应变曲线、结构损伤、塑性耗能分配机制。结果表明:螺栓的滑移以及柱的轴压比都很小;钢管底部测点的横向变形系数都超过0.5;核心混凝土的压应力最大值超过轴心抗压强度,此时钢管对核心混凝土产生套箍约束作用。地震往复作用使柱底的混凝土比梁柱节点处的混凝土更容易开裂和被压碎。该组合框架结构以梁耗能为主,柱耗能为辅,为典型的“强柱弱梁”结构体系。采用的螺栓实体建模方法具有计算精度高、求解效率快的特点,能有效反映框架结构的破坏特征,可适用于模拟实际的螺栓连接组合框架结构。
ABAQUS software was used to build a refined 3D solid finite element(FE) model and perform quasi static analysis of a 1-story,1-span bolt connected square concrete-filled steel tubular(CFT) column-steel beam frame structure. Solid modeling was used for small components such as screws and nuts. The model fully considers the confinement effect of the steel tube on the core concrete,the preload effect of screw and nut,and the frictional contact effect between bolts and T-shaped plate,steel tube and steel beam. The numerical results including failure mode,load-displacement hysteretic curve,stiffness degradation-displacement curve show good agreement with the existing quasi static experimental results. Based on this,further analysis was conducted on macro indicators such as slip of the bolt,axial compression ratio of column,lateral deformation index of steel tube and micro indicators such as stress-strain of core concrete,structural damage,plastic energy dissipation distribution mechanism. The results show that the slip of the bolt and the axial compression of the column are both very small. The lateral deformation index of the control points at the bottom of the steel tube exceeds 0.5,and the maximum compressive stress of the core concrete exceeds the uniaxial compressive strength. At this time,the steel tube exerts a confinement effect on the core concrete. The concrete at the bottom of the column is more prone to cracking and crushing than that at the beam column joints. This composite frame structure is dominated by beam energy dissipation and supplemented by column energy consumption,which is a typical “strong column weak beam” structural system. The bolt solid modeling method has the advantages of high calculation accuracy and solving efficiency and can effectively reflect the failure characteristics of the frame structure,so it can be conveniently used to simulate actual bolt connected composite frame structures.
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国家自然科学基金(52268031)
江西省智慧建筑工程研究中心开放基金(EZ202311419)
河南省科技攻关项目(252102240019)
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