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无平面外支撑的张弦梁在平面内受荷过程中可能发生平面外失稳。该文首先将张弦梁的平面外失稳分为索撑体系的失稳和张弦梁整体失稳,并采用平衡法和能量法对索撑体系的稳定性进行研究;其次对于张弦梁平面外整体失稳,指出将撑杆和拉索的作用等效为集中力、提取钢梁进行稳定设计的方法并不安全;该文采用Ritz法建立张弦梁的势能方程,结合势能驻值原理,得到张弦梁在全跨均布荷载和纯弯荷载下的平面外弹性屈曲荷载,结果与有限元吻合较好。该文得到的张弦梁平面外屈曲荷载计算公式对其平面外稳定设计具有参考作用。
An out-of-plane buckling may occur during the in-plane loading of the beam without the out-of-plane support. In this paper, the out-of-plane buckling of the beam is divided into the instability of the cable-stayed system and the overall instability of the beam. The stability of the cable-stayed system is studied by the balance method and the energy method. Secondly, It is not safe to consider the effect of strut and cable as concentrated force and to extract steel beams for stable design. In this paper, the potential energy equation of the beam is established by Ritz method. Based on the principle of potential energy, The out-of-plane elastic buckling loads under cloth load and pure bending load agree well with finite element. The calculation formula of out-of-plane buckling load of the string string beam obtained in this paper is of reference to the out-of-plane stability design.