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针对悬索桥骑跨式吊索四根索股相距较近存在较强的气动干扰效应问题,参照某大跨径悬索桥的吊索参数,对骑跨式吊索四圆柱驰振气动干扰效应问题进行了数值研究,得到了四圆柱的阻力和升力系数及其气动力导数,然后,对在上游钝体尾流中的下游钝体的稳定性进行了分析。结果表明:顺风向上游钝体在风攻角-8°~6°范围内处于不稳定状态,顺风向下游钝体在-6°~0°和4°~6°范围内处于不稳定状态,处于此不稳定区域内的钝体可能会发生驰振。
Aiming at the problem of strong aerodynamic interference of the four cables of the suspension bridge, the problem of aerodynamic interference with the four-cylinder galloping of the saddle-type slings is studied with reference to the sling parameters of a long span suspension bridge. Numerical analysis shows that the resistance and lift coefficient of the four cylinders and their aerodynamic derivatives are obtained. Then, the stability of downstream bluff body in the upstream bluff body wake is analyzed. The results show that the upstream bluff body is in an unstable state at a wind attack angle of -8 ° to 6 ° and the bluff body downstream in the downwind direction is in an unstable state at a range of -6 ° to 0 ° and 4 ° to 6 °, The bluff body in this unstable area may vibrate.