多点激励下拱桥竖向地震反应的简化计算方法

以某大跨公路拱桥为例，通过对拱桥在三种行波输入模式下地震反应的对比计算，提出了拱脚行波输入的简化输入方式；利用拱桥结构的对称性特点，提出了多点输入下半拱叠加的简化计算方法。经验证，这一计算方法具有良好的计算精度，可将较为复杂的拱桥多点输入地震反应计算问题，转化为工程技术人员熟悉的一致输入下地震反应计算问题。

The Simplified Method for the Vertical Seismic Response Analysis of the Arch Bridge under the Multiple-Support Excitation

Taking a certain long-span arch bridge as the example, this article calculated and compared the seismic responses of the arch bridge under three kinds of traveling wave excitation. Then the arch foot traveling wave excitation was proposed as a simplified input model. According to the symmetrical structure, a simplification computational method was proposed for seismic response analysis of arch bridge in time domain. The time history analysis results indicated that the simplified model can achieve good precision. This method can turn the complex problem of seismic response of the arch bridge under multiple-support excitation into the problem of seismic response under simple support which most of the engineering technologist are familiar with.