【摘要】 本文对平面张弦结构的平面内整体稳定性进行了分析与研究。按平面张弦结构的构成特点,提出下弦索对提高张弦结构整体稳定性的回复力模型,推导了平面张弦结构的屈曲平衡方程,得到了张弦结构的一阶屈曲临界荷载。将理论值与有限元计算结果进行了比较,证明了理论推导公式的准确性。研究结果表明,与两铰拱相比,张弦结构的整体稳定性有很大幅度提高。对平面张弦结构各类型(张弦梁、张弦拱、系杆拱与拱形张弦拱)的整体稳定性进行了分析与比较,讨论了竖腹杆设置数量对整体稳定的影响。按保证整体稳定性考虑,给出了上弦拱为圆管时对截面惯性矩的控制要求。更多还原

【Abstract】 In this paper,in-plane overall stability of plane string structures( PSS) is studied. The restoring force model of the cable which improve the overall stability of the PSS is put forward according to the structural characteristics of the PSS. The buckling equilibrium equation of the PSS is derived,and the first buckling critical load of the PSS is obtained. The theoretical value is compared with the FEM results,and the accuracy of the theoretical derivation is proved. The results show that the overall stability of the PSS is greatly improved compared with the two hinged arch. The overall stability of PSS which includes beam string structure( BSS),arch string structure( ASS),tied arch and arch string structure with upward-curved cable( ASSUC) are analyzed. The effect of web number on overall stability is discussed. The requirements for the section inertia moment of upper arch( circular tube) are given according to the overall stability consideration.更多还原