连续超大跨悬索桥的刚度特征

Rigidity Characteristics of Multi-span Suspension Bridges

为了解不同结构参数对连续超大跨悬索桥的影响,对重力刚度法进行了推广,研究了连续超大跨悬索桥体系的静力刚度特征.考虑主塔抗弯刚度和主缆弹性伸长,导出了多跨悬索桥挠度的计算公式,探讨了悬索桥跨数对重力刚度分布和最大挠度的影响,以及中间塔抗弯刚度对挠度的影响.结果表明,跨数和中间塔抗弯刚度对连续超大跨悬索桥的重力刚度和最大挠度有显著影响.

To probe into the effect of change in structural parameters, the gravity stiffness method was extended and used to investigate the characteristics of vertical deformation of multi-span suspension bridges. Deflection expressions for multi-span suspension bridges were derived by considering the bending stiffness of towers and the elastic extensibility of the main cable. Effects of the number of suspension bridge＇s spans on its gravity stiffness distribution and maximum deflection were investigated. Numerical simulations were carried out to probe into the influence of bending stiffness of a mid-tower on deflection. The research result shows that the number of spans and the bending stiffness of the mid-tower have a great effect on the vertical deflection and gravity stiffness of multi-span suspension bridges.