超大跨径悬索桥主缆材料对静风稳定性的影响

Effects of Different Cable Materials on Aerostatic Stabilities of Super-long-span Suspension Bridges

为比较碳纤维增强塑料(CFRP)和钢2种主缆材料对超大跨径悬索桥静风稳定性的影响,分别采用三维非线性分析方法及整体特征值稳定性分析方法,对采用2种类型主缆的3 500m跨径悬索桥进行静风稳定性分析。结果表明:CFRP主缆悬索桥扭转振动频率较钢缆结构的要高;2种主缆类型超大跨径悬索桥的静风失稳临界风速均较接近;CFRP主缆悬索桥的各阶屈曲系数均较钢缆悬索桥的要大,具有更高的安全储备。

To compare the effects of carbon fiber reinforced plastics（CFRP） cables and steel cables on aerostatic stabilities of super-long-span suspension bridges,based on a suspension bridge with a main span of 3 500 m,the aerostatic stabilities of the bridge with different cable materials were studied respectively by 3D nonlinear analysis and global eigenvalue stability analysis.The results show that the torsional frequency of the bridge with CFRP cables is higher than that with steel cables;the critical wind speeds of the two types of bridges are close to each other;and the buckling coefficients of the bridge with CFRP cables are larger than that with steel cables,so the former has a higher safety margin.