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

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