本文選題：橋梁工程 + 橋梁抗震�。� 參考：《長安大學(xué)學(xué)報(自然科學(xué)版)》2015年04期

【摘要】：以汶川地震中發(fā)生嚴(yán)重破壞的高原大橋為工程背景,采用"多模型多平臺"分析技術(shù)研究了主梁與橋臺及臺后填土的縱向碰撞效應(yīng)及對全橋地震反應(yīng)的影響。首先利用ANSYS軟件建立橋臺及臺后填土非線性數(shù)值分析實體模型,基于靜力Pushover分析模擬其在主梁撞擊下水平力-位移關(guān)系。將上述力-位移關(guān)系引入到MIDAS軟件中,主要以間隙單元模擬橋臺及臺后填土與主梁的碰撞作用,并建立全橋抗震分析模型。通過非線性時程分析及與震害對比,討論了橋臺及臺后填土破壞、伸縮縫處安裝碰撞緩沖裝置等情況下主梁與橋臺間的縱向碰撞響應(yīng)。研究結(jié)果表明:橋臺及臺后填土破壞將增大橋臺伸縮縫處橋臺與主梁間的相對位移,增加了落梁風(fēng)險;由于地震動輸入和橋臺位置不同,碰撞緩沖裝置對臺、梁間碰撞力的影響存在不確定性,建議碰撞緩沖裝置剛度宜取為橋臺及臺后填土整體抗推剛度的1%~5%,并優(yōu)先選用耗能型。
[Abstract]:Taking the plateau bridge seriously damaged in Wenchuan earthquake as the engineering background, the longitudinal collision effect between the main beam and the bridge abutment and the fill behind the abutment and its effect on the seismic response of the whole bridge are studied by using the "multi-model and multi-platform" analysis technique. Firstly, the nonlinear numerical analysis model of bridge abutment and backfill is established by using ANSYS software, and the horizontal force-displacement relationship under the impact of main beam is simulated based on static Pushover analysis. The above force-displacement relation is introduced into MIDAS software. The impact of bridge abutment and backfill with main beam is simulated with clearance element, and the seismic analysis model of the whole bridge is established. Through nonlinear time history analysis and comparison with earthquake damage, the longitudinal impact response between main beam and abutment is discussed under the condition of bridge abutment and embankment failure and collision buffer installation at expansion joint. The results show that the relative displacement between abutment and main beam at abutment expansion joint will be increased and the risk of falling beam will be increased because of the failure of fill soil at abutment and behind abutment, and the collision buffer device is opposite abutment due to the difference between the input of ground motion and the position of abutment. The impact of impact force between beams is uncertain. It is suggested that the stiffness of the impact buffer should be 1 / 5 of the overall anti-push stiffness of the abutment and the backfill of the abutment, and the energy dissipation type should be preferred.
【作者單位】： 大連海事大學(xué)道路與橋梁工程研究所;遼寧省公路工程重點實驗室;
【基金】：國家自然科學(xué)基金項目(51008041,51178071) 教育部新世紀(jì)優(yōu)秀人才支持計劃項目(NCET-12-0751) 中央高校基本科研業(yè)務(wù)費專項資金項目(3132014073,3132014326)
【分類號】：U443.21;U442.54

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