广东江顺大桥抗风性能试验研究

采用风洞试验和CFD数值模拟相结合的方法对主跨700m的广东江顺大桥主桥结构抗风性能进行研究,包括主梁、桥塔气动参数试验与CFD模拟、主梁1/60几何缩尺比节段模型测振试验、主梁1/25几何缩尺比节段模型涡振试验、全桥气弹模型试验研究等.结果表明:该桥在成桥状态和施工状态具有足够的抗风稳定性,在设计风速下涡振性能和抖振响应性能均满足规范要求;大比例主梁节段模型得到的涡振振幅小于常规比例节段模型得到的涡振振幅,表明采用常规比例模型进行桥梁主梁涡振性能评估是偏于保守的.

Experimental Investigation of the Wind-Resistant Performance of Jiang-Shun Bridge in Guangdong

The wind-resistant performance of Jiang-shun Bridge in Guangdong, a cable-stayed bridge with a main span of 700 meters, was investigated by means of wind tunnel tests and computational fluid dynamics method (CFD). The experiments and numerical simulations of the aerodynamic parameters of the main deck and pylon, the wind-induced vibration experiments of the main deck with a sectional model with a geometry scale of 1 to 60, the vortex-induced vibrations (VIV) experiments of the main deck with sectional model with geometry scale of 1 to 25, and the wind tunnel tests of the full bridge aero-elastic model were conducted. The research results have shown that the aerodynamic stability of the bridge during the construction stage or in-service stage is sufficient. The performance of VIV and buffet response under the design wind speed satisfies the demand of the code of wind-resistant design of highway bridges. The VIV amplitudes of the main deck from the section model with geometry scale of 1 to 25 are less than that of the main deck from the section model with a geometry scale of 1 to 60, which indicates that it is conservative to assess the VIV performance of the bridge deck with a section model of conventional scale section.