车-钢桥面铺装耦合振动系统动力效应分析  

Dynamic Analysis of Coupled Vibration System for Vehicle and Steel Bridge Deck Surfacing

作　　者：徐勋倩[1] 

机构地区：[1]南通大学,南通226019

出　　处：《应用力学学报》2009年第3期501-506,共6页Chinese Journal of Applied Mechanics

基　　金：江苏省高校自然科学基金(07KJB580093);南通大学自然科学基金(08B16)

摘　　要：为研究行车车速、桥面的不平度和桥面损伤对车-桥面铺装耦合振动系统动力效应的影响规律,将汽车等效为两自由度五参数模型,将正交异性桥面铺装等效为梁-板结构。在车辆与桥面铺装接触点采用接触力和位移协调的条件,建立车辆和桥面铺装动力耦合系统模型和振动方程组。利用模态分析法以及时变力学系统的求解方法-状态空间法,借助大型有限元软件ANSYS和MATLAB编程技术,求解车-钢桥面铺装耦合振动系统的动力响应。分析由桥面铺装的不平度、车速以及桥面损伤等引起的行驶车辆的随机动荷载对桥面铺装冲击系数的影响,并考虑桥面的不平整将车辆荷载简化成沿铺装层表面的随机动荷载和车辆荷载简化成沿铺装层表面纵向移动的恒载两种加载方式的分析结果进行比较。研究结果表明,在进行铺装层结构设计计算以及复合梁疲劳试验时,可考虑冲击系数为1.5。To investigate dynamic behaviors of steel bridge deck surfacing due to moving vehicles velocity, random surface and bridge-deck-surfacing damage, a moving vehicle is modeled a two-degree-of-freedom system with five parameters,and an orthotropic steel bridges deck surfacing is modeled a slab-on girder. Interaction model and coupled vibration partial differential equation are derived for the coupled vibration system of vehicle and bridge-deck-surfacing, satisfying the geometrical compatibility condition and equilibrium condition of the interaction forces between vehicle and bridges deck surfacing. The coupled dynamics responses of the time-varying system are solved with modal analysis and state space method. The effects of road-surface roughness, vehicle speed and bridge-deck-surfacing damage on the impact are discussed, and dynamic impact factors of pavement are compared in different load cases, which takes the impact parameter only as the function of moving vehicle or road roughness. The analysis suggests that dynamic impact factor can be up to 1.5 as designing the structural of bridge deck surfacing or experimentalizing fatigue on composite beam.

关 键 词：车-钢桥面铺装耦合系统 动力效应 冲击系数 平整度 车速 桥面损伤 

分 类 号：TU435[建筑科学—岩土工程] U211.5[建筑科学—土工工程]