多点激励下多跨斜拉桥缩尺模型的地震响应研究.部分2:数值分析（英文）

发布时间：2018-01-03 19:43

本文关键词：多点激励下多跨斜拉桥缩尺模型的地震响应研究.部分2:数值分析（英文）　出处：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2014年06期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:Objective: to use nonlinear dynamic finite element analysis. The earthquake response of multi-tower cable-stayed bridge under multi-point excitation is simulated and the collapse failure mode of multi-tower cable-stayed bridge under strong earthquake is revealed. Innovative points: the nonlinear dynamic numerical simulation technology of multi-tower cable-stayed bridge is solved. The failure mode of multi-tower cable-stayed bridge under strong earthquake is simulated for the first time. Firstly, the implicit Newmark- 尾 method is used to solve the nonlinear dynamic equation under multi-point earthquake excitation (Fig. 3). Then the explicit central difference scheme is used to simulate the collapse and failure process of bridges under strong earthquake (Fig. 4). Important conclusion: 1.The numerical results of single beam model can well reflect the seismic response of shaking table test. 2.When the El-Centro wave with a peak acceleration of 4.0 m / s ~ 2, the multi-tower cable-stayed bridge model only appears the damage of the middle tower support; 3. When the peak acceleration is 4.0 m / s ~ 2, the multi-tower cable-stayed bridge model appears the support failure, the connection between cable and tower, and the failure of the element in the column section of the middle tower.
【作者单位】： State
【基金】：supported by the National Natural Science Foundation of China(Nos.51178101 and 51378112) the Doctoral Program Project of the Ministry of Education(No.20110092110011) the NationalKey Laboratory of Civil Engineering Disaster Prevention of Tongji University(No.SLDRCE08-HZ-02),China
【分类号】：U448.27;U442.55
【正文快照】： 1 Introduction Over the past 20 years,rapid development habeen made on modern cable-stayed bridges(Gimsingand Georgakis,2011).Many researchers have studiedthe dynamic behavior during ambient vibration andseismic response under multi-support excitations

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