公路荷载作用下斜板桥的动力响应
发布时间：2018-10-09 14:45
【摘要】：针对斜板桥受到公路荷载作用,产生的动力响应,本文提出了交通荷载与斜板桥的计算模型。将斜板桥视为加筋斜板结构,用Pb-2 Rayleigh-Ritz法对其振动特性作出分析,然后运用有限元法和Newmark-β法研究了公路荷载作用下斜板桥的动力响应问题。并对行车速度、车辆轴距、车辆行驶的不同情况、桥跨长度、斜交角以及路面粗糙度等因素对斜板桥的动力响应的影响进行了参数分析。主要的研究内容有:(1)运用pb-2 Rayleigh-Ritz法对加筋斜板结构的振动特性进行分析,计算出结构的自振频率并与有限元法的结果进行对比验证其精确性;(2)把公路荷载和斜板桥看作两个分离的子系统,分别建立了斜板桥模型和公路荷载模型,利用车桥系统之间的位移和力的协调条件,使车桥两个子系统耦合起来;(3)利用路面不平整功率谱密度函数,基于Matlab平台在时域内模拟路面不平整,并将其作为公路荷载与斜板桥耦合振动的激励;(4)利用Newmark-β法,对公路荷载运动方程方程进行计算,得出公路荷载的响应序列,并据此行成作用于斜板桥的力。具体实施,利用Matlab编写语言对方程进行数值计算。最后讨论了路面不平顺、车速、汽车轴距、桥梁长度、桥梁斜交角、等因素对斜板桥动力响应的影响。本文的创新点在理论上,把公路斜板桥模化为加筋斜板结构,运用Pb-2Rayleigh-Ritz法对振动特性作出分析,引入了Newmark-β法对公路荷载作用下斜板桥动力响应问题进行了数值分析。并且对影响斜板桥动力响应参数进行了分析。得出的结果可以为公路斜板桥梁的设计提供理论参考和实践指导。
[Abstract]:In view of the dynamic response of oblique slab bridge subjected to highway load, a calculation model of traffic load and oblique slab bridge is presented in this paper. The inclined plate bridge is regarded as reinforced inclined slab structure, and its vibration characteristics are analyzed by Pb-2 Rayleigh-Ritz method. Then the dynamic response of inclined slab bridge under highway load is studied by using finite element method and Newmark- 尾 method. The effects of driving speed, vehicle wheelbase, vehicle driving, bridge span length, angle of skew and road roughness on the dynamic response of inclined plate bridge are analyzed. The main research contents are as follows: (1) the vibration characteristics of reinforced inclined plate structure are analyzed by pb-2 Rayleigh-Ritz method. The natural vibration frequency of the structure is calculated and compared with the results of the finite element method to verify its accuracy. (2) the highway load and the inclined plate bridge are regarded as two separate subsystems, and the inclined plate bridge model and the highway load model are established respectively. Using the coordination condition of displacement and force between vehicle and bridge system, the two subsystems of vehicle and bridge are coupled. (3) using the power spectrum density function of uneven road surface, the road surface is simulated in time domain based on Matlab platform. It is regarded as the excitation of the coupling vibration of highway load and inclined plate bridge. (4) by using Newmark- 尾 method, the equation of highway load motion is calculated, and the response sequence of highway load is obtained, according to which the force acting on the inclined plate bridge is obtained. In practice, the equation is numerically calculated by Matlab programming language. Finally, the effects of road irregularity, speed, vehicle wheelbase, bridge length, bridge angle and so on the dynamic response of inclined plate bridge are discussed. The innovation of this paper is that, in theory, the inclined slab bridge is modeled as reinforced inclined slab structure, the vibration characteristic is analyzed by Pb-2Rayleigh-Ritz method, and the Newmark- 尾 method is introduced to analyze the dynamic response of inclined slab bridge under highway load. The dynamic response parameters of inclined slab bridge are analyzed. The results can provide theoretical reference and practical guidance for the design of highway inclined bridge.
【学位授予单位】：南昌工程学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U441.3
[Abstract]:In view of the dynamic response of oblique slab bridge subjected to highway load, a calculation model of traffic load and oblique slab bridge is presented in this paper. The inclined plate bridge is regarded as reinforced inclined slab structure, and its vibration characteristics are analyzed by Pb-2 Rayleigh-Ritz method. Then the dynamic response of inclined slab bridge under highway load is studied by using finite element method and Newmark- 尾 method. The effects of driving speed, vehicle wheelbase, vehicle driving, bridge span length, angle of skew and road roughness on the dynamic response of inclined plate bridge are analyzed. The main research contents are as follows: (1) the vibration characteristics of reinforced inclined plate structure are analyzed by pb-2 Rayleigh-Ritz method. The natural vibration frequency of the structure is calculated and compared with the results of the finite element method to verify its accuracy. (2) the highway load and the inclined plate bridge are regarded as two separate subsystems, and the inclined plate bridge model and the highway load model are established respectively. Using the coordination condition of displacement and force between vehicle and bridge system, the two subsystems of vehicle and bridge are coupled. (3) using the power spectrum density function of uneven road surface, the road surface is simulated in time domain based on Matlab platform. It is regarded as the excitation of the coupling vibration of highway load and inclined plate bridge. (4) by using Newmark- 尾 method, the equation of highway load motion is calculated, and the response sequence of highway load is obtained, according to which the force acting on the inclined plate bridge is obtained. In practice, the equation is numerically calculated by Matlab programming language. Finally, the effects of road irregularity, speed, vehicle wheelbase, bridge length, bridge angle and so on the dynamic response of inclined plate bridge are discussed. The innovation of this paper is that, in theory, the inclined slab bridge is modeled as reinforced inclined slab structure, the vibration characteristic is analyzed by Pb-2Rayleigh-Ritz method, and the Newmark- 尾 method is introduced to analyze the dynamic response of inclined slab bridge under highway load. The dynamic response parameters of inclined slab bridge are analyzed. The results can provide theoretical reference and practical guidance for the design of highway inclined bridge.
【学位授予单位】：南昌工程学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U441.3
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