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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,研究SSI效应对提高桥梁结构抗震安全性十分重要。通过对一座1∶10比例的三跨连续刚构桥模型的振动台阵试验,系统分析了SSI效应对大跨度连续刚构桥地震响应的影响规律。研究表明:SSI效应使振动台台面地震动的峰值和频谱特性发生较大变化;剪切波速和上覆土层厚度是影响SSI效应的重要因素;SSI效应会增大桥梁结构的位移和应变响应,其影响程度与地震动的频谱特性和桥梁结构-地基体系的固有特性密切相关;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。
The effect of soil-structure interaction (SSI) on the seismic response of bridge structures on soft ground can not be neglected. Studying the SSI effect is very important to improve the seismic safety of bridge structures. The influence of SSI on the seismic response of long-span continuous rigid frame bridge is systematically analyzed through a vibration table test of a 1:10 ratio three-span continuous rigid frame bridge model. The results show that the SSI effect causes a great change in the peak ground motion and spectrum characteristics of the shaking table. The shear wave velocity and the thickness of the overlying soil are the important factors that affect the SSI effect. The SSI effect will increase the displacement and strain response of the bridge structure, The degree of influence is closely related to the spectral characteristics of ground motions and the intrinsic properties of bridge structure-foundation system. The real-time coupled dynamic substructure test technique is an effective method for shaking table test considering the SSI effect of bridge structure.