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悬索桥在架设期间的抗风稳定性是人们最关心的课题。尽管施工期一般不太长,设计风速也能减小至30～40m/s的典型值范围内(中国虎门大桥在台风多发区,其值为60m/s,陈艾荣等,1997),但要减小扭转频率和竖向频率的比值,需考虑很多因素,尤其在施工初期。施工期间的抗风稳定性常常比成桥状态还要差。为此,现从提高系统整体刚度、控制结构振动特性和改善断面气动性能等三个方面介绍了国内外在改善大跨度悬索桥抗风稳定性能中的实践和探索。
The stability of the wind-resistant bridge during the erection of the suspension bridge is a topic of greatest concern to people. Although the construction period is generally not too long, the designed wind speed can be reduced to a typical range of 30 ~ 40m / s (Humen Bridge in the typhoon prone area, the value is 60m / s, Chen et al., 1997) Small torsional frequency and vertical frequency ratio, to consider many factors, especially in the early construction. The wind stability during construction is often worse than the state of the bridge. For this reason, the practice and exploration of improving the wind-resistant stability of long-span suspension bridges at home and abroad are introduced from three aspects: increasing the overall stiffness of the system, controlling the structural vibration characteristics and improving the aerodynamic performance of the section.