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给出了大跨度缆索承重桥梁静风响应的分析步骤;全面研究了苏通大桥在静风作用下,桩基础刚度、拉索分段、风速剖面、主梁初始攻角和附加攻角等对主梁和桥塔静风位移、静风失稳风速及结构振动频率的影响,并与风洞试验结果进行对比分析。结果表明:静风位移计算值低于风洞试验实测值,雷诺数是其主要原因;如果不考虑桩基础刚度影响,结构侧向位移响应会被严重低估;斜拉索横向风荷载在总体风荷载中所占比例超过40%;不考虑主梁附加攻角会高估静风失稳风速约20%;静风作用下一阶对称竖弯、侧弯和扭转模态频率计算结果与全桥气弹模型风洞试验结果特点相似。
The analysis steps of the static response of long-span cable-bearing bridges are given. The effects of the static wind, such as the stiffness of the pile foundation, the cable section, the wind speed profile, the initial angle of the main beam and the additional angle of attack The static wind displacement of main girder and bridge tower, the wind speed of static wind instability and the vibration frequency of structure, and compared with the wind tunnel test results. The results show that the calculated value of static wind displacement is lower than the actual value of wind tunnel test, and the Reynolds number is the main reason. If the stiffness of pile foundation is not considered, the lateral displacement response of structure will be seriously underestimated. The proportion of load in more than 40%; do not consider the additional angle of attack of the main girder would overestimate the static wind instability wind speed of about 20%; static wind effect of the first order symmetrical vertical bending, bending and torsional modal frequencies and full bridge Aeroelastic model wind tunnel test results have similar characteristics.