【摘要】：為有效分析列車引起的橋梁應(yīng)力響應(yīng),對(duì)車橋耦合動(dòng)力分析法、靜力影響線法及移動(dòng)集中力法3種列車作用下的橋梁應(yīng)力響應(yīng)計(jì)算方法進(jìn)行了深入的比較研究.采用3種方法對(duì)2座鐵路典型混凝土簡(jiǎn)支T梁和下承式鋼桁梁橋進(jìn)行應(yīng)力響應(yīng)分析,基于橋梁現(xiàn)場(chǎng)實(shí)測(cè)數(shù)據(jù)對(duì)比分析了不同方法的計(jì)算結(jié)果,研究了列車速度和橋梁橫向振動(dòng)對(duì)應(yīng)力結(jié)果的影響.結(jié)果表明:車速對(duì)橋梁應(yīng)力響應(yīng)有顯著的影響,共振發(fā)生時(shí)3種方法的計(jì)算結(jié)果相差較大,消振條件下三者區(qū)別減小;由列車水平方向作用力引起的橋梁或構(gòu)件橫向振動(dòng)對(duì)應(yīng)力響應(yīng)的貢獻(xiàn)不容忽視;車橋耦合動(dòng)力分析法能夠更為真實(shí)地反映橋梁構(gòu)件的動(dòng)應(yīng)力歷程,在高速、橋梁橫向剛度較低或列車局部加載的情況下尤其具有計(jì)算精度優(yōu)勢(shì).研究結(jié)果可為3種不同計(jì)算方法的工程應(yīng)用提供參考.
[Abstract]:In order to effectively analyze the bridge stress response caused by train, three methods of calculating bridge stress response under the action of train, such as vehicle-bridge coupling dynamic analysis method, static influence method and moving concentrated force method, are compared and studied in depth. Three methods are used to analyze the stress response of two typical railway simply supported concrete T-beams and underpass steel truss bridges, and the calculated results of different methods are compared and analyzed based on the field measured data of the bridges. The effects of train speed and bridge lateral vibration on stress results are studied. The results show that the speed has a significant effect on the stress response of the bridge. The results of the three methods are quite different when resonance occurs, and the difference among the three methods decreases under the condition of damping vibration. The contribution of the lateral vibration of the bridge or member to the stress response caused by the horizontal force of the train should not be ignored. The vehicle-bridge coupling dynamic analysis method can reflect the dynamic stress course of bridge members more realistically, especially under the condition of high speed, low lateral stiffness of bridge or local loading of train. The results can be used as reference for engineering application of three different calculation methods.
【作者單位】： 東南大學(xué)混凝土及預(yù)應(yīng)力混凝土結(jié)構(gòu)教育部重點(diǎn)實(shí)驗(yàn)室;北京交通大學(xué)土木建筑工程學(xué)院;
【基金】：國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(973計(jì)劃)資助項(xiàng)目(2013CB036203) “十二五”國(guó)家科技支撐計(jì)劃資助項(xiàng)目(2014BAK11B04) 國(guó)家自然科學(xué)基金資助項(xiàng)目(51528802)
【分類號(hào)】：U441.5

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