汽车荷载作用下弹性支承梁桥的动力响应分析
发布时间：2018-08-07 18:47
【摘要】：车桥耦合振动是国内外学者研究的一个热点问题，在过去的研究中通常忽略桥梁下部结构和支座的弹性影响，将桥梁的支承视为刚性支承。大量的研究成果也表明该简化方法合理适用。然而，近年来高架桥梁的大量修建和橡胶支座的广泛应用使我们对车桥耦合振动的研究提出了新的问题：采用橡胶支座的高架桥梁的支承弹性效应影响大，，研究这类桥梁的车桥耦合振动，仍然将桥梁的边界条件简化成刚性是否能够满足适用性。围绕这一问题，本文展开了研究。 本文运用大型有限元软件ANSYS，建立弹性支承梁桥的结构模型，并通过调节支座刚度K值，研究其变化对桥梁结构动力特性的影响。利用ANSYS获得桥梁结构的自振频率、模态质量、模态刚度以及桥梁的振型参数，最后将这些参数导入到用Fortran语言编制的计算车桥耦合响应的程序中，计算了弹性支承梁桥在汽车荷载作用下的动力响应，并分析了汽车的车速、桥面的平整度和支承的刚度对桥梁动力响应的影响。 对弹性支承条件下的简支梁桥和连续梁桥作出研究分析后可得到以下结论： 1、行车速度的变化对桥梁动挠度的影响不大；桥面平整度的不同等级对桥梁响应结果的影响较为明显。该结论与在刚性支承条件下所得结果一致。 2、弹性支承对桥梁在汽车荷载作用下的动力响应是有影响的，影响的大小与桥梁支承刚度的取值有关。当支承刚度取值较大时，弹性支承对动力响应的影响较小，将桥梁的边界条件简化为刚性仍然适用；当支承刚度取值较小时，弹性支承对动力响应的影响较大，将桥梁的边界条件简化为刚性将产生较大误差，应当考虑支座弹性效应的影响。
[Abstract]:The vehicle-bridge coupling vibration is a hot issue studied by scholars at home and abroad. In the past researches, the elastic influence of the bridge understructure and support is usually ignored, and the bridge support is regarded as rigid support. A large number of research results also show that the simplified method is reasonable. However, in recent years, with the extensive construction of elevated bridges and the wide application of rubber bearings, we have put forward a new problem in the study of vehicle-bridge coupling vibration. By studying the vehicle-bridge coupling vibration of this kind of bridge, the boundary condition of the bridge is simplified to whether the rigidity can satisfy the applicability. Around this problem, this article has launched the research. In this paper, the finite element software ANSYSis is used to establish the structural model of the elastic supported beam bridge, and by adjusting the K value of the support stiffness, the influence of the change on the dynamic characteristics of the bridge structure is studied. The natural vibration frequency, modal mass, modal stiffness and modal parameters of bridge structure are obtained by ANSYS. Finally, these parameters are introduced into the program compiled by Fortran language to calculate vehicle-bridge coupling response. The dynamic response of an elastic supported beam bridge under vehicle load is calculated and the effects of vehicle speed, deck smoothness and stiffness on the dynamic response of the bridge are analyzed. Based on the analysis of simply supported beam bridge and continuous beam bridge under the condition of elastic support, the following conclusions can be obtained: 1. The change of driving speed has little effect on the dynamic deflection of bridge; The effect of different grade of deck smoothness on bridge response is obvious. This conclusion is consistent with the results obtained under the condition of rigid support. 2. The elastic support has an effect on the dynamic response of the bridge under the vehicle load, and the magnitude of the influence is related to the value of the bridge support stiffness. When the stiffness of the support is larger, the influence of the elastic support on the dynamic response is small, the boundary condition of the bridge is simplified to rigidity, and when the value of the stiffness of the support is small, the influence of the elastic support on the dynamic response is greater. To simplify the boundary condition of the bridge to rigidity will result in great error, so the effect of bearing elastic effect should be considered.
【学位授予单位】：暨南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.3
本文编号：2171016
[Abstract]:The vehicle-bridge coupling vibration is a hot issue studied by scholars at home and abroad. In the past researches, the elastic influence of the bridge understructure and support is usually ignored, and the bridge support is regarded as rigid support. A large number of research results also show that the simplified method is reasonable. However, in recent years, with the extensive construction of elevated bridges and the wide application of rubber bearings, we have put forward a new problem in the study of vehicle-bridge coupling vibration. By studying the vehicle-bridge coupling vibration of this kind of bridge, the boundary condition of the bridge is simplified to whether the rigidity can satisfy the applicability. Around this problem, this article has launched the research. In this paper, the finite element software ANSYSis is used to establish the structural model of the elastic supported beam bridge, and by adjusting the K value of the support stiffness, the influence of the change on the dynamic characteristics of the bridge structure is studied. The natural vibration frequency, modal mass, modal stiffness and modal parameters of bridge structure are obtained by ANSYS. Finally, these parameters are introduced into the program compiled by Fortran language to calculate vehicle-bridge coupling response. The dynamic response of an elastic supported beam bridge under vehicle load is calculated and the effects of vehicle speed, deck smoothness and stiffness on the dynamic response of the bridge are analyzed. Based on the analysis of simply supported beam bridge and continuous beam bridge under the condition of elastic support, the following conclusions can be obtained: 1. The change of driving speed has little effect on the dynamic deflection of bridge; The effect of different grade of deck smoothness on bridge response is obvious. This conclusion is consistent with the results obtained under the condition of rigid support. 2. The elastic support has an effect on the dynamic response of the bridge under the vehicle load, and the magnitude of the influence is related to the value of the bridge support stiffness. When the stiffness of the support is larger, the influence of the elastic support on the dynamic response is small, the boundary condition of the bridge is simplified to rigidity, and when the value of the stiffness of the support is small, the influence of the elastic support on the dynamic response is greater. To simplify the boundary condition of the bridge to rigidity will result in great error, so the effect of bearing elastic effect should be considered.
【学位授予单位】：暨南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.3
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