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基于平缀管式等截面钢管混凝土格构柱在水平低周往复荷载作用下的拟静力试验结果,采用Open Sees建立纤维单元杆系计算模型,对影响此类结构水平荷载-位移骨架曲线的主要因素进行参数分析。采用三折线简化模型模拟水平荷载-位移骨架曲线,通过理论推导或数据统计分析得到了平缀管式等截面钢管混凝土格构柱相关骨架曲线控制参数的简化计算公式,包括:考虑柱肢与缀管剪切变形的弹性阶段刚度的计算公式;基于塑性铰破坏并考虑轴力-弯矩相关曲线的水平峰值荷载的计算公式;基于数据统计分析并考虑实际工程需要的位移延性系数的峰值位移与极限位移的简化计算公式。与拟静力试验、有限元参数分析以及模拟实际结构尺寸扩大参数分析的结果进行的比较表明,三折线简化模型可以有效地模拟平缀管式等截面钢管混凝土格构柱的骨架曲线,相关骨架曲线控制参数的简化计算公式具有较高精度。
Based on the quasi-static test results of CFST under the action of horizontal low cycle reciprocating loads, Open Sees was used to establish the calculation model of the fiber unit rod system. The influence of horizontal load-displacement skeleton curve of such structure The main factors for parameter analysis. The simplification formula of the control parameters of the related skeleton curve of CFST column with CFRP was obtained by theoretical deduction or data statistical analysis by using the simplified model of the third fold line to simulate the horizontal load-displacement skeleton curve. The formulas include: The calculation formula of the horizontal peak load based on the plastic hinge damage and taking into account the axial force-bending moment correlation curve; the peak displacement of the displacement ductility coefficient based on the statistical analysis of the data and taking into account the actual engineering requirements; and Simplified Calculation of Limit Displacement. Comparisons with the results of quasi-static test, finite element analysis and simulation results show that the simplified model of the tri-fold line can effectively simulate the skeleton curve of the CFST column, the related skeleton Simplified calculation of curve control parameters with higher accuracy.