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以一典型4跨6层纯框架为例,用有限元方法计算了该框架结构所有构件的轴向约束刚度,并且对其影响因素进行了分析:目标梁或柱构件轴向约束刚度分别主要受其所在层或所在跨的子框架构件的影响。基于以上分析,推导出了平面框架构件轴向约束刚度的近似计算方法:为目标构件选取合适的子框架,然后计算出子框架中每一根构件贡献的侧移刚度和轴向刚度,最后按照刚度的串并联法则组合计算得到目标构件的轴向约束刚度。此近似方法可以较简便而相对准确地计算出框架构件的轴向约束刚度。
Taking a typical 4-span 6-story pure frame as an example, the axial restraint stiffness of all members of the frame structure was calculated by finite element method, and its influencing factors were analyzed. The axial restraint stiffness of the target beam or column member were mainly affected by The layer or sub-frame components that it is located in. Based on the above analysis, the approximate calculation method of the axial restraint stiffness of plane frame members is deduced. The suitable sub-frame is selected for the target members and then the lateral displacement stiffness and axial stiffness contributed by each member in the sub-frame are calculated. Finally, The stiffness and stiffness of the series parallel combination rule calculated by the target member of the axial restraint stiffness. The approximate method can calculate the axial restraint stiffness of frame members relatively easily and relatively accurately.