Abstract: Considering the influence of variable cross-section of main girder to the large span suspension bridge with single cable, the test data of aerostatic force coefficients was obtained by the wind tunnel test. Based on this and considering structural geometric nonlinearity and load nonlinearity, the finite element model of the single cable long span suspension bridge at different construction stages and the completed bridge state was established by using ANSYS. With the method of increment and internal and external double iteration, APDL language was used for secondary development to develop corresponding program, and aerostatic stability of large span suspension bridge of nonlinear single cable and nonlinear static wind response under different wind speed in different construction stage and completion state was analyzed. Research suggests that: the critical wind speed of static wind instability of a single cable long-span suspension bridge during construction stage decreases with the increase of main girder assembly rate, and it reaches the minimum before closing. After the completion of the bridge, the stiffness of the structure will increase significantly, and the static wind response have no great impact on the single span cable suspension bridge with completed state. Therefore, attention should be paid to the static response during construction, especially closure.

Key words: bridge engineering, single cable suspension bridge, nonlinear, completion stage, construction stage, aerostatic stability

摘要： 考虑了单缆大跨悬索桥变截面主梁节段的影响，通过风洞试验获得了不同节段的静三分力试验数据。在此基础上，考虑了结构几何非线和荷载非线性，采 用ANSYS建立了单缆大跨悬索桥不同施工阶段和成桥状态的有限元计算模型，采用增量与内外两重迭代相结合的方法，运用APDL语言进行了二次开发并编制了相 应的程序，对单缆大跨悬索桥的非线性静风稳定性进行了分析，并求解了不同风速下不同施工阶段和成桥状态的非线性静风响应。研究表明：单缆大跨悬索桥施 工阶段的静风失稳临界风速随着主梁拼装率的增加而降低，在即将合拢前达到最小。成桥后结构刚度大幅提升，静风响应不会对成桥状态的单缆大跨悬索桥产生 较大影响。因此，应注意施工过程中，特别是即将合拢时的静风响应。

关键词: 桥梁工程, 单缆悬索桥, 非线性, 成桥阶段, 施工阶段, 静风稳定性