中文摘要：

土-结构相互作用（SSI）对软土地基上桥梁结构地震响应的影响不可忽略。通过对一座1：10比例的四跨高架连续梁桥模型的振动台阵试验，系统地分析了SSI效应对大跨度连续梁桥地震响应的影响规律。研究表明：顺桥向地震激励下，SSI效应增大r桥墩变形、墩底受力、墩顶水平加速度及主梁水平加速度，地震响应峰值随剪切波速的减小而单调递增，说明剪切波速是影响SSI效应的重要因素；桥墩加速度响应、位移响应和应变响应对SSI效应的敏感程度有所差异，其中加速度响应对SSI效应最敏感，考虑SSI效应后增幅最大；SSI效应将引起支座相对位移的剧烈变化；实时耦联动力子结构试验技术是进行桥梁结构考虑SSI效应的振动台试验的有效方法。

英文摘要：

The influence of soil-structure interaction under earthquake excitation should be considered for the bridge- foundation system, especially for the foundation of soft soil. A 1 ： 10 scaled model of a four-span continuous girder bridge was tested on shaking tables to investigate the influence of soil-structure interaction on seismic response of the bridge model. The experimental results indicate that SSI efl＇ect increases the dynamic response of the bridge model. The peak of the response monotonously increases as the shear wave velocity decreases, which shows the shear wave velocity is an important factor influencing the SSI effect. The sensitivity of acceleration, displacement and strain to SSI effect is significantly different. The acceleration is more sensitive to SSI effect in the longitudinal direction. Furthermore, SSI effect may cause dramatic changes in the relative displacement of bearings. The test results verify the effectiveness of the real-time dynamic hybrid testing technique.