考虑温度-车辆耦合的准低温季节混凝土桥铺装应力分析  

Stress Analysis of Asphalt Pavement on Concrete Bridge Deck under Quasi-Low Temperature Considering Vehicle-Temperature Coupling

作　　者：刘云[1] 

机构地区：[1]河海大学土木与交通学院,江苏南京210098

出　　处：《上海公路》2013年第3期16-20,9,共5页Shanghai Highways

基　　金：上海建交委科研项目(2009-003-006);中国博士后基金(20110491342);江苏省博士后基金(1101018C)

摘　　要：为了研究环境与车载耦合作用对混凝土桥铺装层受力的影响,首先推导材料特性随温度变化的沥青混合料桥面铺装在温度—车辆耦合作用下的应力有限元计算公式。然后采用有限元方法建立混凝土箱梁桥多层铺装复合结构仿真模型,通过现场实测和仿真计算,分析准低温季节铺装结构温度场日变化和车辆荷载耦合作用下的铺装层拉应力。计算结果表明:拉应力峰值出现在桥墩上方对应的铺装层表面,较易较早出现开裂破坏;考虑铺装各层结构温度梯度变化后,耦合作用下的横向拉应力峰值在中午处于谷值,纵向拉应力峰值变化不明显;耦合荷载作用下的横向拉应力峰值比车辆荷载作用情况增加2.76倍,纵向拉应力峰值涨幅为42%。在铺装层的设计中必须考虑温度荷载的作用。In order to investigate the influence of vehicle-temperature coupling effect on pavement of concrete bridge deck,a formula was derived fo stresses within the AC pavement under vehicle-temperature coupling load,with the consideration of the temperaturedependant mechanical properties of materials.Based on the data collected from a concrete box girder bridge in Hu-Hang highway widening project,a composite structure model of two spans from this bridge was established.The change of temperature distribution within the structure in a freezing day was analyzed,with which the stresses under the coupling load were calculated.This study shows that the maximum tensile stress normally appears at the surface of pavement which locates on the top of pier,and therefore these parts crack more easily.It was also found that the transversal tensile stress of the pavement under coupling load reaches the minimum at the noon;while the longitudinal tensile stress does not change significantly with time.Results also show that,when temperature load was taken into consideration,the peak transversal tensile stress was 3.76 times as big as that of the pavement under vehicle load only,and an increase of 42%was observed for the peak longitudinal tensile stress.This indicated that the temperature load is a factor of great importance in the bridge pavement design.

关 键 词：混凝土桥 桥面铺装 准低温 温度-车辆耦合 

分 类 号：U443.33[建筑科学—桥梁与隧道工程]