山区峡谷高墩连续刚构桥抗风性能与气动外形优化

为研究山区峡谷高墩连续刚构桥的抗风性能,以木绒大桥为例,利用流体计算软件(CFD),模拟计算桥位处常遇风速20 m/s的情况下连续刚构桥1/4跨主梁截面在大涡模型下的-3°、0°和3°风攻角三分力系数,并与风洞试验结果进行对比验证;利用验证所得三分力系数,通过模拟计算总结在主梁中央增加0.10~0.25 h的上稳定板、下稳定板和对翼缘板进行流线化处理措施条件下的抗风效果,以期为山区峡谷地形连续刚构桥抗风设计和抗风效果优化提供可靠依据。

Wind Resistance Performance and Aerodynamic Configuration Optimization of Continuous Rigid Frame Bridge with High Pier in Mountain Canyon

In order to study the wind resistance of continuous rigid frame bridge with high piers in mountain canyon terrain with the example of Murong Bridge,fluid calculation software(CFD) is used to simulate the three-point force coefficients of wind attack angle at-3°,0°,and 3°of the 1/4-span girder section of the continuous rigid-frame bridge under the large eddy model when the wind speed at the bridge location is often 20 m/s.The aerodynamic coefficients are compared with the results of the wind tunnel test.The verified three-point force coefficients are used to summarize the wind resistance effect of adding 0.10~0.25 h upper stabilizer plate,lower stabilizer plate in the center of the main girder,and the flange plate under streamlining treatment conditions by simulation calculation,which could provide a reliable basis for the wind resistance design and optimization of the wind resistance effect of continuous rigid frame bridges in mountain canyon terrain.