行波激励下千岛湖大桥的随机地震响应特征

Effect of Traveling Wave on Stochastic Seism Response of QianDaohu Bridge

钢管混凝土拱桥因为其优秀的结构特性在工程界中得到越来越多的广泛应用。随着工程与科学技术的发展和实际工程的需要,钢管混凝土拱桥的跨度越来越大,单纯的一致激励已经不能满足工程抗震的需要。因此本文对杭州千岛湖1号大桥采用随机振动方法,对拱肋内力响应随视波速的变化趋势进行分析。结果证明,大跨度拱桥在一致激励和行波激励下会出现迥异的响应。

The concrete filled steel tube （CFST） arch-bridge has found wide engineering application because of its good structural characteristics. As the development and actual need of engineering and technology, the span of the CFST arch-bridge became larger and larger, The uniform excitation cannot satisfy the anti-seismic checking. The application of stochastic vibration was made to No.1 bridge of QianDaohu in Hangzhou against wave velocities responsed to the inner force exerted by arched ribs, with their variable tendency analyzed. Results certificated that a large span arched bridge produced cyclone effect from travelling waves and uniformed ones.