Analytical behaviour of concrete-encased CFST columns under cyclic lateral loading
首发时间:2015-04-10
Abstract:The analytical behaviour of concrete-encased CFST (concrete-filled steel tube) columns under cyclic lateral loading is reported in this paper. A finite element analysis (FEA) model is developed to investigate the cyclic behaviour of such composite column. Comparisons are made between measured and predicted results on failure modes, load versus displacement relationships and ultimate strength. It is found that the proposed FEA model can reproduce the experimental results with a good accuracy. The full-range load-displacement relationships, the contact stress between steel tube and concrete and the axial load distribution among different components are analyzed using the verified FEA model. The cyclic behaviour of concrete-encased CFST is compared with that of conventional CFST and reinforced concrete (RC) columns. The parametric analysis is conducted to investigate influences of various parameters on moment-curvature (M-φ) envelope curves, including the material strength, steel ratio of inner CFST, longitudinal reinforcement ratio, stirrup characteristic value, tube diameter to cross-sectional width ratio (D/B) and axial load level. Finally, a hysteretic model for the M-φ relationship of concrete-encased CFST column is proposed.???
keywords: Concrete-encased CFST Concrete Column Cyclic loading Finite element analysis Parametric study Hysteretic model
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钢管混凝土叠合柱在侧向往复荷载下数值性能研究
摘要:本文研究了钢管混凝土叠合柱在侧向往复荷载作用下的数值性能。为了研究钢管混凝土叠合柱的滞回性能,建立了三维有限元模型。通过比较模拟与试验的破坏模态,荷载-位移关系及极限承载力,发现提出的有限元模型可以较好地预测试验结果。借助有限元模型,对钢管混凝土叠合柱荷载-位移关系、钢管与混凝土间的接触应力和轴力在不同组件间的分配等进行了分析。同时将钢管混凝土叠合柱的滞回性能与传统的钢管混凝土柱、钢筋混凝土柱进行了对比分析。为了研究不同参数对弯矩-曲率关系曲线骨架线的影响,进行了参数分析,参数包括:材料强度,内部钢管混凝土组件的含钢率,纵筋配筋率,箍筋配箍特征值,钢管直径与截面尺寸的比值D/B,以及轴压比。在参数分析的基础上,提出了钢管混凝土叠合柱弯矩-曲率滞回模型。
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No.4637859104911214****
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