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针对峡谷地区典型特大跨高墩桥梁结构风荷载的不确定性问题,采用计算流体动力学(CFD,Computational Fluid Dynamics)方法,对大跨变截面主梁和超高双柱薄壁桥墩的风荷载进行数值识别。研究不同气流攻角对主梁结构风荷载的影响、不同气流风偏角对超高薄壁墩风荷载的影响、考虑尾流干扰效应的双柱薄壁桥墩气动力变化过程。同时,从气流作用微观角度分析了气流对大跨高墩刚构桥梁结构风荷载的作用机理。通过数值计算,为设计人员进行大跨高墩桥梁风荷载的取值提供了参考,对目前我国相关桥梁设计规范的缺陷进行了有效的补充。
Aiming at the uncertainty of the wind load of the bridge structure with typical large span high pier in canyon area, the wind load of large span cross-section girder and ultra-high double-column thin-walled piers is numerically identified by computational fluid dynamics (CFD) method. The influence of different angles of attack on the wind load of the main girder structure, the influence of different wind angles on the wind load of the ultra-thin thin-walled piers, and the aerodynamic variation process of the double-column thin-walled piers considering wake disturbance were studied. At the same time, the mechanism of air flow on the wind load of the rigid-framed bridge structure with long-span high pier is analyzed from the microscopic point of airflow effect. Through numerical calculation, it provides a reference for designers to take the value of wind load of long-span high pier bridges, and effectively complements the defects of the relevant bridge design codes in our country at present.