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大跨度悬索桥结构具有显著的几何非线性行为,且存在材料特性、几何尺寸的随机性.先对缆索采用较小抗弯刚度参数的梁单元,对悬索桥进行确定性的几何非线性分析;然后采用响应面法进行非线性随机静力分析;最后针对1座大跨悬索桥,计算了在竖向活载作用下材料、几何尺寸的随机性对主梁跨中位移的影响.结果表明,结构随机性的影响十分明显.
The long-span suspension bridge structure has significant geometric nonlinear behavior, and there is the randomness of material properties and geometrical dimensions.A certain geometric nonlinear analysis of the suspension bridge is carried out firstly using beam elements with small bending stiffness parameters in the cable; Response surface method is used to do nonlinear stochastic static analysis.Finally, according to a long-span suspension bridge, the influence of material and geometric randomness on the mid-span displacement of the main girder under vertical live load is calculated.The results show that the structural randomness The impact is very obvious.