大跨径钢桥面铺装层车辆动响应影响因素分析  

Analysis of Dynamic Response of Long-span Steel Deck Pavement under Moving Loads

作　　者：徐勋倩[1] 

机构地区：[1]南通大学建筑工程学院,江苏南通226019

出　　处：《公路交通科技》2009年第9期85-90,共6页Journal of Highway and Transportation Research and Development

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

摘　　要：从耦合振动的角度出发,研究大跨径钢桥面铺装层在车辆随机动荷载作用下的响应机制。将汽车等效为2自由度5参数模型,考虑桥梁表面不平顺产生的随机激励,建立车-钢桥面铺装耦合振动分析模型。利用模态分析与时变系数常微分方程求解方法,分析钢桥面铺装在车辆随机动荷载作用下的动力响应分布规律。定义由铺装层竖向位移、拉应力和拉应变表示的动力放大系数,研究车速、桥面不平度、铺装层开裂损伤和粘结层滑移等对动力放大系数的影响。结果表明,路面不平度、粘结层滑移是影响动力放大系数的主要因素,在进行大跨径钢桥面铺装结构设计时可考虑动力放大系数为1.5。Based on the coupled vibration theory, dynamic behavior of long-span steel bridge deck pavement under random moving vehicles was studied. The vehicle was modeled as a two-DOF system with five parameters, and a three-dimensional vehicle-bridge coupling vibration model was established with consideration of the vertical random excitation caused by deck surface roughness. Based on modal analysis and the differential equation with time-varying coefficients, the dynamic response distribution generated by vehicle- deck pavement random interaction was analysed.The dynamic magnification factor expressed by vertical displacement, tensile stress and strain on the bridge deck pavement were defined to find out the effect of vehicle velocity, deck surface roughness, pavement crack and bonding layer slippage on the dynamic magnification factor. The result shows that surface roughness and bonding layer slippage are the major influencing factors on the dynamic magnification factor which can be up to 1.5 when designing bridge deck pavement structure.

关 键 词：桥梁工程 车辆动荷载响应 耦合振动 钢桥面铺装 路面不平度 粘结层滑移 

分 类 号：U443.33[建筑科学—桥梁与隧道工程]