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研究目的:为多塔斜拉桥在一致激励和非一致激励下地震响应的研究提供地震模拟振动台全桥试验方法,并有助于加强多塔斜拉桥抗震性能和抗震设计的认识。创新要点:1.建立了地震模拟振动台多台阵试验方法,并首次将其应用于多塔斜拉桥全桥比例缩尺模型的地震响应分析之中;2.通过地震模拟振动台试验,揭示了多塔斜拉桥在多点一致激励和多点非一致激励的地震响应特性并提出了多塔斜拉桥在强震下的破坏模式。研究方法:1.基于动力相似理论,设计与制作了多塔斜拉桥的全桥比例缩尺模型(图2);2.利用地震模拟振动台多台阵试验,根据在不同地震波作用下和考虑行波效应后多塔斜拉桥模型的主梁和主塔响应,分析了多塔斜拉桥在多点一致激励和多点非一致激励的地震响应特性(图5~图8);3.根据在地震波不同强度作用下多塔斜拉桥模型的主梁和主塔响应,分析了多塔斜拉桥在强震下的破坏模式和地震响应(图9)。重要结论:1.江心波作用下该多塔斜拉桥的地震响应大于其他三种地震波;2.多塔斜拉桥在抗震设计时需要考虑行波效应的影响;3.在El-Centro波的加速度峰值高达4.0 m/s2时,多塔斜拉桥模型出现了支座破坏。
Research purposes: This paper provides a full-bridge test method of shaking table for seismic simulation of multi-tower cable-stayed bridges under seismic excitation under uniform excitation and non-uniform excitation, and helps to enhance the understanding of seismic performance and seismic design of multi-tower cable-stayed bridges. Innovative points: 1. The multi-array test method of seismic simulation shaker is established and applied to the seismic response analysis of multi-tower cable-stayed bridge full scale model for the first time. 2. Through the shaking table test of seismic simulation, The seismic response characteristics of multi-tower cable-stayed bridges under multi-point excitation and multi-point non-uniform excitation are revealed and the failure modes of multi-tower cable-stayed bridges under strong earthquakes are proposed. Research methods: 1. Based on dynamic similarity theory, a full-bridge scale model of multi-tower cable-stayed bridge was designed and fabricated (Figure 2); 2. Using seismic simulation of multi-array test of shaker table, Considering the response of main girder and main tower of multi-tower cable-stayed bridge model after traveling wave effect, the seismic responses of multi-tower cable-stayed bridge under multi-point and multi-point non-uniform excitation are analyzed (Fig. 5 to Fig. 8) According to the response of main girder and main tower of multi - pylon cable - stayed bridge under different intensity of seismic wave, the failure mode and seismic response of multi - pylon cable - stayed bridge under strong earthquakes are analyzed (Fig. 9). The main conclusions are as follows: 1. The seismic response of the multi-tower cable-stayed bridge under the action of Jiang Xinbo is greater than that of the other three kinds of seismic waves. 2. The effect of traveling wave effect needs to be considered in seismic design of multi-tower cable- When the acceleration peak reaches 4.0 m / s2, the bearing failure occurs in the multi-tower cable-stayed bridge model.