列车荷载作用下矮塔斜拉桥索梁振动的相关性

发布时间：2019-01-01 12:06

【摘要】：为探讨不同列车速度下矮塔斜拉桥斜拉索振动与桥梁整体振动之间的相关性,基于列车-线路-桥梁耦合振动理论与动力学模型,以某主跨115 m+95 m的铁路矮塔斜拉桥为工程背景,考虑斜拉索与桥梁整体结构之间的相互作用,通过数值积分得到梁体、桥塔振动响应以及斜拉索局部振动响应.结果表明:列车荷载作用下索梁振动相关性问题实质上是一个能量传递过程,当拉索端点位移激励频率与其自振频率接近时,能量易于在索梁间传递;当列车以225~350 km/h的设计时速通过桥梁、列车荷载的激励频率与斜拉索自振频率接近时,斜拉索在外激励作用下会产生共振,但共振幅值不大(斜拉索局部振动幅值小于3 mm).
[Abstract]:In order to study the correlation between the cable vibration and the whole vibration of a cable-stayed bridge with low tower at different train speeds, based on the theory and dynamic model of train-line-bridge coupling vibration. Taking a railway low tower cable-stayed bridge with a main span of 115 m 95 m as the engineering background, considering the interaction between cable and the whole structure of the bridge, the vibration responses of beam, tower and cable are obtained by numerical integration. The results show that the vibration correlation problem of cable beam under train load is essentially an energy transfer process. When the displacement excitation frequency at the end of the cable is close to its natural vibration frequency, the energy is easily transferred between the cables and beams. When the train passes the bridge at a design speed of 225 ~ 350 km/h and the excitation frequency of the train load is close to the natural vibration frequency of the cable-stayed cable, resonance will occur under the external excitation of the stay cable. But the co-amplitude value is small (the local vibration amplitude of stay cable is less than 3 mm).
【作者单位】：西南交通大学土木工程学院;
【基金】：国家自然科学基金资助项目(U1434205) 国家973计划资助项目(2013CB036301) 中央高校基本科研业务费专项资金资助项目(SWJTU12BR037) 中国铁路总公司科技研究开发计划项目(2013G001-A-1)
【分类号】：U441.3;U448.27

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