公路高墩大跨径连续体系桥梁共振响应研究及防治措施
发布时间：2018-07-27 11:58
【摘要】：本文研究涉及的连续体系桥梁包括连续刚构、连续梁、连续梁—刚构组合体系三种桥梁结构，因其结构相似，所以在此统称为连续体系桥梁。大跨径连续体系桥梁因其跨越能力较大、抗震性能较好、设计施工均较为成熟、具有良好的经济性等优点，在我国有着广泛应用，往往是首选方案，，特别是在西部沟壑地区。但由于实际需要，这种连续体系桥梁跨径越来越大，结构越来越纤细化，桥梁结构基频越来越低，使得桥梁共振问题越来越突出，其对高墩大跨径连续体系桥梁本身安全性的影响越来越大。公路高墩大跨径连续体系桥梁共振问题引起了学术界和工程界的关注，对公路高墩大跨径连续体系桥梁共振及其影响分析研究具有非常重要的理论价值和工程价值。 本文依托陕西省3座高墩大跨径连续体系桥梁工程，以陕西省3座高墩大跨径连续体系桥梁为原型进行有限元建模分析，进行了以下工作。 （1）给出了高墩大跨径桥梁发生车桥耦合共振的判定方法。 （2）利用二次开发的车桥耦合计算模块，借助于ANSYS详细研究了多车辆匀速车列不同激扰频率、不同车速等不同工况下桥墩和主梁控制截面动位移、动挠度、动加速度、动弯矩等参数的车桥耦合振动响应规律。 （3）对比共振动力响应值与《公路桥梁通用规范》规定的静荷载（1+μ）静力响应值。 （4）给出了加装液体粘滞阻尼器（FVD）对高墩大跨径连续体系桥梁车桥耦合共振响应的影响，提出了加装液体粘滞阻尼器（FVD）减小高墩大跨径连续体系桥梁共振响应的新方法。
[Abstract]:The continuous system bridges in this paper include continuous rigid frame and continuous beam-rigid frame composite systems. Because of their similar structures, they are called continuous system bridges in this paper. Long span continuous system bridges are widely used in China, especially in the western gully area, because of their large span capacity, good seismic performance, mature design and construction, good economy and so on. However, due to the actual needs, the bridge span of this continuous system is becoming larger and larger, the structure is becoming more and more slender, and the fundamental frequency of the bridge structure is getting lower and lower, which makes the bridge resonance problem more and more prominent. It has more and more influence on the safety of long span continuous system bridges with high piers. The problem of bridge resonance in highway high-pier long-span continuous system has attracted the attention of academic and engineering circles. It has very important theoretical and engineering value for the analysis and study of bridge resonance and its influence in highway high-pier long-span continuous system. In this paper, based on three bridges with high piers and long span continuous system in Shaanxi Province, the finite element modeling and analysis of three long-span continuous system bridges with high piers as prototype are carried out. The following works have been done. (1) the method of determining the vehicle-bridge coupling resonance of long-span bridges with high piers is given. (2) the vehicle-bridge coupling calculation module is developed. With the aid of ANSYS, the dynamic displacement, deflection and acceleration of bridge piers and main beams under different excitation frequencies and different speeds are studied in detail. Dynamic bending moment and other parameters of vehicle-bridge coupling vibration response law. (3) compare the resonance dynamic response value with the static load (1 渭) response value specified in the General Code for Highway and Bridge. (4) We give the added liquid viscosity. The effect of hysteretic damper (FVD) on the coupled resonance response of vehicle-bridge in long-span continuous system with high piers. A new method for reducing the resonance response of a bridge with a liquid viscous damper (FVD) is proposed in this paper.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.3;U448.11
[Abstract]:The continuous system bridges in this paper include continuous rigid frame and continuous beam-rigid frame composite systems. Because of their similar structures, they are called continuous system bridges in this paper. Long span continuous system bridges are widely used in China, especially in the western gully area, because of their large span capacity, good seismic performance, mature design and construction, good economy and so on. However, due to the actual needs, the bridge span of this continuous system is becoming larger and larger, the structure is becoming more and more slender, and the fundamental frequency of the bridge structure is getting lower and lower, which makes the bridge resonance problem more and more prominent. It has more and more influence on the safety of long span continuous system bridges with high piers. The problem of bridge resonance in highway high-pier long-span continuous system has attracted the attention of academic and engineering circles. It has very important theoretical and engineering value for the analysis and study of bridge resonance and its influence in highway high-pier long-span continuous system. In this paper, based on three bridges with high piers and long span continuous system in Shaanxi Province, the finite element modeling and analysis of three long-span continuous system bridges with high piers as prototype are carried out. The following works have been done. (1) the method of determining the vehicle-bridge coupling resonance of long-span bridges with high piers is given. (2) the vehicle-bridge coupling calculation module is developed. With the aid of ANSYS, the dynamic displacement, deflection and acceleration of bridge piers and main beams under different excitation frequencies and different speeds are studied in detail. Dynamic bending moment and other parameters of vehicle-bridge coupling vibration response law. (3) compare the resonance dynamic response value with the static load (1 渭) response value specified in the General Code for Highway and Bridge. (4) We give the added liquid viscosity. The effect of hysteretic damper (FVD) on the coupled resonance response of vehicle-bridge in long-span continuous system with high piers. A new method for reducing the resonance response of a bridge with a liquid viscous damper (FVD) is proposed in this paper.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.3;U448.11
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