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平面张弦梁结构在达到承载能力极限状态时下弦索可能会进入塑性阶段,此时将索视为线弹性材料来进行承载能力分析的做法是不合理的。首先研究了不同索失效应力水平下索材料非线性对结构承载性能的影响规律。然后提出了一种考虑索材料非线性的改进ANSYS有限元模拟方法。利用该方法计算了多种参数情形下索材料非线性对平面张弦梁结构承载性能的影响程度。这为平面张弦梁结构的合理设计提供了参考。
When the plane beam string structure reaches the ultimate bearing capacity, the lower chord may enter the plastic phase. At this time, it is unreasonable to regard the cable as a linear elastic material for carrying capacity analysis. Firstly, the influence of nonlinearity of cable materials on the bearing capacity of structures under different cable failure levels is studied. Then, an improved ANSYS finite element simulation method considering nonlinearity of cable material was proposed. This method is used to calculate the degree of influence of the nonlinearity of cable material on the bearing capacity of the plane beam string under various parameters. This provides a reference for the rational design of the plane beam string structure.