钢管混凝土拱桥的多维平稳随机地震响应

Stationary Stochastic Response of CFST Arch Bridge to Multi-component Seismic Excitation

用随机振动理论,对钢管混凝土拱桥的多维地震响应的计算方法和响应特性进行了研究.提出了多维激励作用下的虚拟激励法,采用该方法分析了钢管混凝土拱桥在多维激励作用下的平稳随机响应特性,并探讨了主拱横撑刚度对结构响应特性的影响.结果表明,多维激励作用下的虚拟激励法与传统的随机振动理论具有相同的计算精度,但速度要快得多;横向激励和竖向激励对拱肋内力的影响较大,拱肋内力响应有随横撑刚度增大而增大的趋势.

The response of concrete-filled steel tube (CFST) arch bridges to multi-component seismic excitation and its calculation were investigated using the theory of random vibration. A pseudo-excitation method for multi-component seismic excitation was proposed, the stationary stochastic response of CFST arch bridges to multi-component seismic excitation was analyzed with this method, and the effect of traverse brace stiffness on the stochastic response was discussed. The result shows that this method has the same accuracy as the classic stochastic vibration method and an advantage in calculation velocity. Transverse and vertical seismic excitations have a large effect on the internal force of arch rib, and the internal force increases with the increasing of traverse brace stiffness.