高深峡谷斜拉桥施工期静风稳定性分析

Analysis of Aerostatic Stability of Cable-stayed Bridge in Deep Gorge During Construction Period

基于非线性静风稳定性分析方法,结合高深峡谷地形下非线性风场环境的影响,对斜拉桥施工期静风稳定性进行分析研究。通过数值模拟对比不同工况下的结构变形位移,分析得出:非线性风场对斜拉桥的施工期影响较大,其中非线性风场中决定因素是非线性风攻角;斜拉桥最大单悬臂状态为施工期最不利状态;斜拉桥施工期最不利状态比成桥期更容易发生静风失稳;斜拉桥悬臂长度相同的情况下,单悬臂比双悬臂的静风稳定性更高。

Based on the nonlinear aerostatic stability analysis method,the aerostatic stability of cable-stayed bridge during construction period is analyzed and studied in combination with the influence of nonlinear wind field environment under high and deep canyon terrain.By comparing the deformation and displacement of the structure under different working conditions through numerical simulation,it is concluded that the nonlinear wind field has a greater impact on the construction period of the cable-stayed bridge,and the decisive factor in the nonlinear wind field is the attack angle of the nonlinear wind;the state of the cable-stayed bridge with single cantilever is the most unfavorable state during the construction period;the most unfavorable state of the cable-stayed bridge during the construction period is more prone to aerostatic instability than during the completed bridge period;When the cantilever length of cable-stayed bridge is the same,the static wind stability of single cantilever is higher than that of double cantilever.