钢管混凝土四肢格构柱抗震性能试验研究及有限元分析

Aseismic performance test and FEM analysis of concretefilled steel tube lattice columns

为了解四肢钢管混凝土格构柱的破坏特征和塑性耗能性能,进行了4根四肢钢管混凝土格构式柱低周往复荷载试验。分析了其荷载-位移滞回曲线和骨架曲线。利用ABAQUS有限元软件建立了钢管混凝土格构柱模型并进行了计算分析,计算结果与拟静力试验结果吻合良好。分别对6种不同缀管形式的四肢钢管混凝土格构式柱进行了有限元分析,讨论了缀管排列方式、缀管数量等对其耗能能力的影响。分析结果表明:缀管数量适当增多可提高钢管混凝土格构式柱塑性耗能能力;缀管形式为闪电形平行排列的格构式柱塑性耗能能力最佳;结构受力对称可提高耗能能力;斜缀管耗能能力更强,横缀管对柱的耗能能力影响较小。文中研究成果是对钢管混凝土格构式柱抗震性能分析的补充,给钢管混凝土格构式柱的工程应用提供了参考。

To enable a better understanding of the failure characteristic and plastic energy dissipation performance of the concrete filled steel tubular(CFST)laced columns,four CFST laced columns consisting of 4 main steel-concrete tubes were tested under cyclic loading.Meanwhile,hysteresis and failure mechanisms were studied based on the test results.Moreover,a CFST laced column model was established using ABAQUS finite element software,and the calculation results are in good agreement with the results of the pseudo-static test.Andtheplasticenergydissipation performance of the four CFST laced columns is analyzed by using six tube parameters including tube arrangement,number of tubes and so on.The result shows that tubes arranged in parallel in the form of a lightning behaves best on the plastic energy dissipation performance of CFST laced columns.According to the comparison of the results,the more the number of piping tubes,the more symmetrical the structural force and the stronger the energy dissipation performance.The slanted tube has a stronger energy consumption performance.However,the horizontal tube has a smaller impact on the energy dissipation of the laced column.It would provide a reference for the engineering application of the CFST laced column and it can be used for seismic performance analysis of the CFST four-limbed laced columns in the mega composite structure system.