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以湘潭湘江四大桥为工程背景,分析了横撑对斜拉拱桥稳定、自由振动和抗震等力学性能的影响。首先,基于AN SY S有限元软件,建立了湘潭湘江四大桥的空间有限元模型。其次,从斜拉拱桥的特值屈曲和非线性屈曲两个方面来研究横撑对斜拉拱桥的稳定安全性和极限承载能力影响;用模态分析方法研究了横撑对斜拉拱桥的自振特性的影响;在非一致激励条件下,研究了横撑对斜拉拱桥抗震性能的影响。通过以上研究得出:较大的横撑刚度有利于斜拉拱桥稳定性的提高,但同时降低了结构的抗震性能。
Taking the Xiangjiang No.4 Bridge in Xiangtan as the engineering background, the influence of transverse bracing on the mechanical properties such as stability, free vibration and earthquake resistance of the cable-stayed bridge was analyzed. First, based on AN SY S finite element software, the spatial finite element model of Xiangjiang River Bridge No.4 is established. Secondly, the influence of cross-bracing on the stability and ultimate bearing capacity of the cable-stayed arch bridge is studied from two aspects of the characteristic buckling and the nonlinear buckling of the cable-stayed bridge. The modal analysis method is used to study the effect of bracing on the self- Vibration characteristics. Under non-uniform excitation conditions, the effect of bracing on the seismic performance of the cable-stayed bridge is studied. Through the above studies, it is concluded that the larger transverse stiffness of bolster is conducive to the stability of the cable-stayed arch bridge, but the seismic performance of the structure is also reduced.