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钢管混凝土结构因其具有良好的延性等抗震性能,在地震荷载作用下,具有较强的抗倒塌能力,使其在工程实践中得到广泛的应用。该文在已有的有限元数值分析模型基础上,通过将不同轴压比下方形和圆形钢管混凝土柱-钢筋环绕式钢筋混凝土梁连接节点的计算滞回曲线、骨架线与试验滞回曲线相比较,验证有限元模型并揭示节点的抗震特性。通过对典型轴压比下钢管混凝土结构节点的工作机理分析,研究受力全过程中节点裂缝和变形发展过程,明确节点极限状态和破坏模态;揭示节点核心区混凝土约束力、钢筋应变、核心区剪力的变化规律。基于比较不同轴压比下节点极限状态的核心混凝土应力和核心区剪力状态,确定轴压比对节点破坏模态的影响。
Because of its good ductility and other seismic performance, the concrete-filled steel tube structure has strong anti-collapse ability under seismic load, which makes it widely used in engineering practice. Based on the existing finite element numerical analysis model, the calculated hysteresis curve, the skeletal line and the experimental hysteresis curve are obtained by comparing the calculated hysteretic curves of the connection points of square and circular CFST columns with reinforced concrete surrounding beams with different axial compression ratios Compare the curves, verify the finite element model and reveal the seismic characteristics of the nodes. By analyzing the working mechanism of the concrete-filled steel tubular joints under typical axial compression ratio, the process of joint crack and deformation in the whole process of the mechanical stress is studied, and the ultimate state and failure modes of the joints are clarified. The concrete confinement, steel strain, District shear force changes. The influence of axial compression ratio on the failure mode of the joint was determined based on the comparison of the core concrete stress and the shear stress in the core under different axial compression ratio.