重载铁路桥梁动力响应的随机性分析及最大值估计
发布时间：2019-07-13 18:19
【摘要】：为评估现有桥梁通行大轴重列车的可行性,基于某重载铁路桥梁的现场试验数据,对不同轴重列车以不同运行速度通过桥梁时桥梁动力响应的随机性进行分析,并且结合3倍标准差原理进行动力响应最大值估计。结果表明:在60~80km·h~(-1)的速度范围内,列车速度对桥梁的竖向挠度和横向振幅影响不大;随着列车速度的提高,桥梁的竖向振幅缓慢增加,而且桥梁跨中的横、竖向强振频率和振动加速度也呈逐渐增大趋势;随着货车轴重的增加,桥梁的竖向挠度呈近似线性增加趋势,振幅和振动加速度也不断增大;25t轴重运营列车引起的桥梁动力响应的概率密度离散程度较大,而试验列车的离散程度较小;在相同列车速度条件下,跨中的横向响应比竖向响应的随机性大,振幅和振动加速度的随机性相当,竖向挠度的随机性最小;对1座孔跨布置为2-24m的低高度预应力混凝土T型简支梁桥的动力响应最大值估计的结果表明,该桥能够通行75km·h~(-1)速度以下的30t轴重列车。
[Abstract]:In order to evaluate the feasibility of the existing bridge passing through the large axle load train, based on the field test data of a heavy load railway bridge, the randomness of the bridge dynamic response of different axle load trains passing through the bridge at different running speeds is analyzed, and the maximum dynamic response is estimated according to the principle of 3 times standard deviation. The results show that in the speed range of 60 ~ 80km 路h ~ (- 1), the train speed has little effect on the vertical deflection and transverse amplitude of the bridge, and with the increase of the train speed, the vertical amplitude of the bridge increases slowly, and the transverse and vertical strong vibration frequency and vibration acceleration in the middle of the bridge span also increase gradually. With the increase of freight car axle load, the vertical deflection of the bridge increases approximately linearly, and the amplitude and vibration acceleration also increase. The probability density discretization of the dynamic response of the bridge caused by the 25t axle load operation train is larger, but the dispersion degree of the test train is small. Under the same train speed condition, the lateral response in the middle of the span is larger than the randomness of the vertical response, the randomness of amplitude and vibration acceleration is the same, and the randomness of vertical deflection is the smallest. The maximum dynamic response of a low height prestressed concrete T-type simply supported beam bridge with a span of 2 鈮，
本文编号：2514189
[Abstract]:In order to evaluate the feasibility of the existing bridge passing through the large axle load train, based on the field test data of a heavy load railway bridge, the randomness of the bridge dynamic response of different axle load trains passing through the bridge at different running speeds is analyzed, and the maximum dynamic response is estimated according to the principle of 3 times standard deviation. The results show that in the speed range of 60 ~ 80km 路h ~ (- 1), the train speed has little effect on the vertical deflection and transverse amplitude of the bridge, and with the increase of the train speed, the vertical amplitude of the bridge increases slowly, and the transverse and vertical strong vibration frequency and vibration acceleration in the middle of the bridge span also increase gradually. With the increase of freight car axle load, the vertical deflection of the bridge increases approximately linearly, and the amplitude and vibration acceleration also increase. The probability density discretization of the dynamic response of the bridge caused by the 25t axle load operation train is larger, but the dispersion degree of the test train is small. Under the same train speed condition, the lateral response in the middle of the span is larger than the randomness of the vertical response, the randomness of amplitude and vibration acceleration is the same, and the randomness of vertical deflection is the smallest. The maximum dynamic response of a low height prestressed concrete T-type simply supported beam bridge with a span of 2 鈮，
本文编号：2514189
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