Experimental assessment of soil–structure interaction effects on a super long-span cable-stayed-bridge with pile group foundations
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Soil–structure interaction (SSI) plays an important role in overall structural seismic behavior. However, there is a scarcity of experimental studies evaluating the SSI effects on a full bridge including superstructure, pile foundations and site soil. This paper focused on shaking table investigations on the effects of SSI on a super long-span cable-stayed bridge model with pile groups and mixture soil modelled by using uniaxial laminar shear boxes. The cable-stayed bridge model was subjected to a series of earthquake excitations in the longitudinal direction, including white noise and various earthquake waves. The dynamic interactive behavior of the cable-stayed bridge model was explored for various shaking amplitudes and frequency components. Furthermore, the influences of the soil on the system dynamic characteristics were clarified statistically. The test results show that the SSI obviously affects the seismic response of the cable-stayed bridge model in the longitudinal direction, and corresponding accelerations of structural members are amplified. The bridge seismic response may be underestimated and misinterpreted to some extent while the SSI effects are ignored. It is, therefore, suggested that more attentions should be poured into the SSI effects when performing the seismic design of super long-span cable-stayed bridges. Moreover, the SSI effects on the bridge seismic responses decrease with the increase of shaking amplitude, and significantly change as the frequency components of the input motions vary. When evaluating the system damping ratio with the SSI, the system seismic responses may be varied to a certain degree if the soil viscous damping contribution is neglected.
KeywordsCable-stayed bridge Pile group Soil–structure interaction Shaking tables Full bridge model Soil viscous damping
This study was sponsored by the National Natural Science Foundation of China (Grant Nos. 91515101-5, 51608282). The authors greatly acknowledge Profs. Menglin Lou, Fayun Liang, Qingjun Chen and Wancheng Yuan from Tongji University, for their comments on the experimental program. The authors are thankful for the graduate students, Miss Dan Nie, Mr. Jianguo Wang, Mr. Yajie Jia, Mr. Haibing Chen, Mr. Sheng Jiao, Mr. Yaohua Yang and Mr. Chao Luo from Tongji University, and Dr. Chengyu Yang from the State Key Laboratory for Disaster Reduction in Civil Engineering for their dedicated assistance in the course of shaking table tests. This work was also sponsored by the K. C. Wong Magna Fund in Ningbo University.
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