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研究目的:通过非线性动力有限元分析,模拟多塔斜拉桥在多点激励下的地震响应以及揭示其在强震下的倒塌破坏模式。创新要点:解决了多塔斜拉桥的非线性动力数值模拟技术,并首次模拟了多塔斜拉桥在强震下的破坏模式。研究方法:首先采用隐式的Newmark-β法求解多点地震激励下的非线性动力方程(图3),随后采用显式的中心差分格式对强震作用下桥梁的倒塌破坏过程进行数值仿真(图4)。重要结论:1.单主梁模型的数值结果可以很好地反映地震模拟振动台试验的地震响应结果;2.在加速度峰值为4.0 m/s2的El-Centro波时,多塔斜拉桥模型只出现了中塔支座的破坏;3.在加速度峰值为4.0 m/s2的江心波时,多塔斜拉桥模型先后出现了支座破坏、拉索与塔的连接破坏以及中塔上塔柱段的单元失效。
The purpose of this study is to simulate the seismic response of multi-tower cable-stayed bridges under multi-point excitation and to reveal the collapse failure mode under strong earthquakes through nonlinear dynamic finite element analysis. Innovative points: The multi-tower cable-stayed bridge to solve the nonlinear dynamic numerical simulation technology and for the first time simulated multi-tower cable-stayed bridge under strong earthquakes failure mode. Research methods: First, the implicit Newmark-β method is used to solve the nonlinear dynamic equation under multi-point seismic excitation (Figure 3), and then an explicit central difference scheme is used to simulate the process of collapse and collapse of bridges under strong earthquakes Figure 4). The main conclusions are as follows: 1. The numerical results of the single girder model can well reflect the seismic response of the shaking table test in the earthquake simulation.2. In the El-Centro wave with peak acceleration of 4.0 m / s2, Only appeared in the tower damage; 3. In the peak acceleration of 4.0 m / s2 Jiang Xinbo, multi-tower cable-stayed bridge model has appeared in the bearing damage, cable and tower connection damage and tower on the tower Section of the unit failure.