中文摘要：

利用集中质量法对典型三跨连续梁桥的上部结构进行简化,并将桥墩的横向抗推刚度简化为等效弹簧,建立连续梁桥横桥向简化动力分析模型,通过梁墩的线刚度比变化模拟不同布置方案,研究梁墩刚度分布对连续梁桥横桥向动力特性及抗震简化分析方法的影响.结果表明：由简化的动力分析模型能够精确得出梁墩刚度分布对连续梁桥横桥向动力性能的影响趋势;当2个桥墩刚度相同时,随着梁墩刚度比的逐步增大,横桥向动力特性由连续梁模式转变为近似简支梁模式;两墩刚度比是影响连续梁桥横桥向动力特性的主要因素;当两墩刚度比不变时,连续梁横桥向基频振型质量参与系数随着桥墩整体刚度的减小而增加;在判断连续梁桥横桥向规则性和选择桥梁抗震简化分析方法时,不仅要考虑各桥墩的刚度比,而且还须考虑梁墩刚度比的影响.

英文摘要：

The superstructure of a typical three-span continuous beam bridge was simplified by using lumped mass method,and the transverse anti-push rigidity of pier was simplified as equivalent spring.Thus the simplified model for the dynamic analysis of continuous beam bridge in transverse direction was established.Different arrangement schemes were simulated by the variation of beam-pier linear stiffness ratios,and the impacts of beam-pier stiffness distribution on the dynamic characteristics of continuous beam bridge in transverse direction and the simplified seismic analysis method were studied.Results show that the influence of beam-pier stiffness distribution on the dynamic characteristics of continuous beam bridge in transverse direction can be obtained precisely by the simplified dynamic analysis model.When the stiffness of two piers is same,the dynamic characteristics in transverse direction can be changed from continuous beam pattern to simply supported beam pattern approximately with the gradual increase of beampier stiffness ratio.The stiffness ratio of the two piers is the major factor influencing the dynamic characteristics of continuous beam bridge in transverse direction.When the stiffness ratio of the two piers is constant,the fundamental modal mass participation factor of continuous beam bridge in transverse direction increases with the decrease of the overall stiffness of piers.Not only the stiffness ratio of each pier but also the influence of beam-pier stiffness ratio should be taken into account for judging the regularity of continuous beam bridge in transverse direction and selecting bridge seismic simplified analysis method.