连续刚构桥双肢薄壁高墩风荷载研究

Study of Wind Loads on Double-Shaft Thin-Wall High Piers of Continuous Rigid-Frame Bridge

采用计算流体动力学(CFD)方法模拟了连续刚构桥双肢薄壁高墩在纵桥向和横桥向风作用下的风载特性。针对工程实际范围内的单肢截面宽厚比和双薄壁间净距比,分别研究了纵桥向风作用下这些参数变化对上下游薄壁阻力系数的影响,以及横桥向风作用下当这些参数变化时薄壁顺风向风力系数和横风向风力系数的变化。

In this paper, the computational fluid dynamics (CFD) method is used to simulate the wind load characteristics of double-shaft thin-wall high piers of continuous rigid-frame bridge under natural wind in the directions of longitudinal and lateral bridge axis. With reference to the width to depth ratio, and the ratio of clear spacing between the two thin walls of a single pier shaft section of the actual bridge, the paper respectively studies the effects of the changed parameters of the aforesaid ratio on the aerodynamic drag coefficients of the thin walls at both the upstream and downstream sides subjected to the wind from the longitudinal bridge axis, and as the parameters are changed, the along\|wind force coefficients of the thin walls and variation of wind force coefficients under the wind from the lateral bridge axis.