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为克服现行设计方法对不对称荷载下结构体系可靠性考虑较少的不足,该文提出了一种改进的设计方法。首先讨论了不对称荷载下荷载效应函数的特性,在结构实例分析的基础上得到了荷载效应函数的一般模型。基于此函数模型,在结构体系层次上可获得极限状态方程的显示表达式。然后进一步分析了极限状态曲面在标准正态空间中的非线性程度。最后依据选定的目标可靠指标值计算了分项系数的一组最佳值。这为大跨空间结构在不对称荷载下的体系可靠性设计提供了参考。
In order to overcome the shortcomings of the current design methods on the reliability of the structural system under asymmetric load, an improved design method is proposed. Firstly, the characteristics of load effect function under unsymmetrical load are discussed. The general model of load effect function is obtained on the basis of structural example analysis. Based on this function model, the expression of the limit state equation can be obtained at the structural system level. Then the nonlinear state of the limit state surface in normal normal space is further analyzed. Finally, a set of optimal values of the partial coefficients is calculated based on the selected target reliability index. This provides a reference for the design of system reliability of long-span space structures under asymmetric load.