冬季极端气候下城市快速路钢桥面铺装力学响应  

Mechanical Response of Steel Bridge Deck Pavement on Urban Expressway in Extreme Weather in Winter

作　　者：刘莲娟 张勐[2,3] LIU Lian-juan;ZHANG Meng(Jiangxi Tianchi Expressway Technology Development Co Ltd.,Nanchang Jiangxi 330000,China;Research Institute of Highway,Ministry of Transport,Beijing 100088,China;Key Laboratory of Road Structure and Material of MOT,Beijing 100088,China)

机构地区：[1]江西省天驰高速科技发展有限公司,江西南昌330000 [2]交通运输部公路科学研究院,北京100088 [3]道路结构与材料交通运输行业重点实验室,北京100088

出　　处：《公路交通科技》2021年第8期44-49,共6页Journal of Highway and Transportation Research and Development

摘　　要：为研究冬季极端气候下城市快速路钢桥面铺装的力学响应及适合该极端气候下的钢桥面铺装方案,解决冬季极端气候下钢桥面铺装在行车荷载作用下容易产生的开裂问题,利用ABAQUS建立钢桥面三维铺装体系模型,模拟不同铺装层厚度组合和不同工作温度等条件,计算“双层EA”结构和“下层EA+上层SMA”结构的铺装层上表面最大拉应力、最大拉应变、最大竖向位移及层间最大剪应力4个特征力学响应值,分析钢桥面铺装厚度对力学控制指标的影响,探究钢桥面铺装温度对力学控制指标的影响,以此进行冬季极端气候下城市快速路钢桥面铺装的结构组合方案优选。研究结果表明:相同铺装材料下,对比3种厚度组合的桥面铺装层上表面最大拉应力、最大拉应变、最大竖向位移及层间最大剪应力,均为下层2. 5 cm+上层3. 5 cm>下层3 cm+上层3. 5 cm>下层3 cm+上层4 cm;在-45~50℃范围内,随着温度升高,两种铺装结构的铺装层上表面最大拉应力和层间最大剪应力逐渐减小,铺装层上表面最大拉应变、最大竖向位移增大;“双层EA”结构铺装层上表面最大拉力大于“下层EA+上层SMA”结构;“双层EA”结构和“下层EA+上层SMA”结构铺装层上表面最大拉应变、最大竖向位移和层间最大剪应力较为接近;“下层3 cm EA+上层4 cm SMA”的铺装结构能够适应冬季极端气候工况。To study the mechanical response of steel bridge deck pavement on urban expressway and solve the problems of cracking of steel bridge deck pavement under traffic load in extreme weather in winter,a 3D steel bridge deck pavement model is built by ABAQUS to simulate different paving layer thickness combinations and different working temperatures and other conditions.Four characteristic mechanical response values,namely,maximum tension stress,maximum tension strain,maximum vertical displacement and maximum interlaminar shearing stress of the upper surface of the pavement layer in double EA structure and lower EA+upper SMA structure under different pavement thicknesses and different temperatures are calculated.The influences of steel bridge deck pavement thickness and temperature on mechanical control indicators are analyzed,and the structural combination scheme of urban expressway steel bridge deck pavement in extreme winter weather is optimized accordingly.The result shows that(1)the maximum tension stress,the maximum tension strain,the maximum vertical displacement and the maximum interlaminar shearing stress of lower 3 cm+upper 4 cm structure is lower than those of both lower 2.5 cm+upper 3.5 cm structure and lower 3 cm+upper 3.5 cm structure when the pavement materials are same;(2)in the range of-45~50℃,as the temperature rises,the maximum tensile stress and the maximum shear stress on the upper surface of the pavement layer of the 2 pavement structures gradually decrease,while the maximum tensile strain and maximum vertical stress on the upper surface of the pavement layer gradually decrease;(3)the maximum tension stress of the double EA structure is larger than that of lower EA+upper SMA structure,while the maximum tension strain,the maximum vertical displacement and the maximum interlaminar shearing stress of double EA structure are close to those of lower EA+upper SMA structure;(4)the lower 3 cm EA+upper 4 cm SMA structure is able to adapt to extreme weather conditions in winter.

关 键 词：道路工程 力学响应 数值模拟 结构组合 钢桥面铺装 

分 类 号：U416.221[交通运输工程—道路与铁道工程]