空间曲塔大跨斜拉桥抗风性能研究

Study on Wind Resistance Performance of Long-span Cable-stayed Bridge with Spatial Curved Pylon

摘要:

跨江大桥跨径较大，桥位风速较高，抗风问题至关重要。随着桥梁造型逐渐复杂，规范中一般公式无法适用其抗风计算，因此针对某主跨为238 m的跨江空间曲塔斜拉桥的抗风性能进行了研究。研究内容包括：利用虚拟风洞试验技术获取了主梁的静气动力系数、气动导数以及桥塔分段的模拟风荷载；利用三维颤振稳定性分析方法检验了主梁颤振性能；对主梁的涡激共振进行了数值模拟，得到了不同风攻角下的振幅-风速曲线；分析了结构静风荷载下的位移响应。结果表明，该桥主体结构的抗风性能均满足规范要求。

Abstract:

It is very important for the wind resistance of bridge because of its long span crossing river and high wind speed at the bridge location. With the bridge structure becoming more and more complicated, the general formulas in specifications cannot be applied to the calculation of wind resistance. Therefore, the wind resistance performance of a river-crossing curved-pylon cable-stayed bridge with a main span of 238 m is studied. The research includes that the virtual wind tunnel technology is used to obtain the static aerodynamic coefficients, aerodynamic derivatives of the main girder and the simulated wind load of the bridge pylon sections. The flutter performance of the main girder is tested by the three-dimensional flutter stability analysis method. The vortex-induced resonance of the main girder is numerically simulated to obtain the amplitude-wind speed curves under the different wind attack angles. The displacement response of the structure under the static wind load is analyzed. The results show that the wind resistance performance of the bridge meets the specification requirements.