本文關(guān)鍵詞：多點(diǎn)激勵(lì)下多跨斜拉橋縮尺模型的地震響應(yīng)研究.部分2:數(shù)值分析（英文）　出處：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2014年06期 　論文類型：期刊論文

  更多相關(guān)文章： 多塔斜拉橋 非線性有限元分析 多點(diǎn)激勵(lì) 破壞模式

【摘要】：研究目的:通過(guò)非線性動(dòng)力有限元分析,模擬多塔斜拉橋在多點(diǎn)激勵(lì)下的地震響應(yīng)以及揭示其在強(qiáng)震下的倒塌破壞模式。創(chuàng)新要點(diǎn):解決了多塔斜拉橋的非線性動(dòng)力數(shù)值模擬技術(shù),并首次模擬了多塔斜拉橋在強(qiáng)震下的破壞模式。研究方法:首先采用隱式的Newmark-β法求解多點(diǎn)地震激勵(lì)下的非線性動(dòng)力方程(圖3),隨后采用顯式的中心差分格式對(duì)強(qiáng)震作用下橋梁的倒塌破壞過(guò)程進(jìn)行數(shù)值仿真(圖4)。重要結(jié)論:1.單主梁模型的數(shù)值結(jié)果可以很好地反映地震模擬振動(dòng)臺(tái)試驗(yàn)的地震響應(yīng)結(jié)果;2.在加速度峰值為4.0 m/s2的El-Centro波時(shí),多塔斜拉橋模型只出現(xiàn)了中塔支座的破壞;3.在加速度峰值為4.0 m/s2的江心波時(shí),多塔斜拉橋模型先后出現(xiàn)了支座破壞、拉索與塔的連接破壞以及中塔上塔柱段的單元失效。
[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.
【作者單位】： 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
【分類號(hào)】：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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