中文摘要：

以一座试设计主跨1400 m斜拉桥为工程背景,进行了多点振动台阵试验。试验采用包括桩基础的1∶70缩尺模型,通过层状剪切土箱模拟场地土的作用,台阵包括4个振动台,可模拟非一致地震输入。研究了半漂浮体系、弹性约束体系和辅助墩体系等不同结构体系对斜拉桥纵向地震响应的影响;进而针对辅助墩体系,研究了上塔柱区段附加耗能构件对斜拉桥横向地震响应的影响;最后通过破坏性试验研究了斜拉桥的横向破坏模式及其灾变过程。结果表明：弹性拉索体系和辅助墩体系可有效减小主塔和塔-梁的纵向相对位移;附加的耗能构件对塔顶横向相对位移的减小效果有限,但可有效降低主塔应变响应,起分散主塔受力和附加耗能作用;主塔的横向破坏模式具有明显的双塑性铰模式。

英文摘要：

In this study, a 1∶70 scaled model of a cable-stayed bridge, with a central span of 1400 m, was tested using a multiple shaking table array system at Tongji University. The effects of various structural systems, including the floating system, the elastically constrained system and the supporting pier system, on the seismic behaviors of the scaled model were investigated in the longitudinal direction. Focusing on the supporting pier system, the effects of the supplemental energy dissipation components equipped between two pylon legs on the seismic response of the scaled model were also clarified under uniform excitations in the transverse direction. Finally, the destructive testing was carried out to investigate the failure modes and catastrophe process of the scaled model in the transverse direction. The experimental results showed that： the elastically constrained system and the pier system could significantly reduce the displacement of the pylon top and the relative displacement between the pylon and the girder compared to those of the floating system; although the supplemental energy dissipation components installed between the pylon legs at the top region was not effective enough to decrease the displacement of the pylon top, it could effectively reduce the strain response of the pylon; the pylon top and bottom regions were subjected to damage under destructive testing, indicating a failure mode with double plastic hinges.