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为研究海口市荣山河四线并联斜交桥桥墩河段水动力特性及不同水位下的桥墩-桥梁体系整体的自振特性,应用FLUENT及ANSYS软件,基于分离涡方法(DES法),建立了四线斜交桥河段的河槽水流三维模型,模拟了不同流速和不同斜交角度下的流场分布及流固耦合作用下的桥墩-桥梁体系自振特性。结果表明:荣山河四线并联斜交桥的过流能力可达到400m~3/s,桥下最大壅高为0.69m,桥下留有一定安全距离;考虑流固耦合作用下的斜交桥墩-桥梁体系满水情况下的自振频率为7.66Hz,不会与通过列车发生共振危险。
In order to study the hydrodynamic characteristics and the natural vibration characteristics of bridge piers and bridges under different water levels in the four-lane parallel Slope of Haihe River, the FLUENT and ANSYS softwares are used to establish the The three-dimensional model of fluvial flow in the four-lane skewed bridges is used to simulate the flow field distribution under different flow velocities and skew angles and the natural vibration characteristics of the bridge-bridge system under fluid-solid coupling. The results show that the overcurrent capacity of the 4-parallel parallel skewed bridges in Rongshan River reaches 400m ~ 3 / s, the maximum height of the bridge is 0.69m, leaving a certain safe distance under the bridge. Considering the skewed pier - The natural frequency of a bridge system with full water is 7.66 Hz and will not be at risk of resonance with a train.