传力杆对接缝传荷能力及临界荷位处应力的影响  

INFLUENCE OF DOWEL BARS ON LOAD TRANSFER EFFICIENCY AND THERMAL STRESSES IN CEMENT CONCRETE PAVEMENT

作　　者：蒋应军[1] 张伟宏 

机构地区：[1]长安大学特殊地区公路工程教育部重点实验室,陕西西安710064 [2]河南省许昌市公路管理局,河南许昌461000

出　　处：《工程力学》2009年第3期21-25,共5页Engineering Mechanics

基　　金：河南省交通科技项目(200321)

摘　　要：应用3D有限元模型,分析了传力杆对接缝传荷能力及临界荷位处应力的影响。结果表明:温度变化对设传力杆路面的接缝传荷效能影响较大,负温度梯度的作用有利于降低板边挠度值,而对于特定路面结构,传荷系数是温度和时间的函数;在计算临界荷位处温度应力和荷载应力时可不考虑传力杆的影响,对纵缝设拉杆时建议在计算温度应力时引入拉杆修正系数ktr,建议ktr=1.02―1.05。In this study a detailed Three-Dimensional Finite Element（3D FE）model is used to investigate the state of contact stresses, mid slab stresses, and load transfer efficiency（LTE）developed in dowel jointed concrete pavements under the influence of combined impact and thermal loads. The results indicate that the influence of temperature variations on LTE of doweled joints is very large, that the application of a negative temperature gradient made for reducing deflections at joints and LTE of a specific pavement is time dependant. The influence of dowel bars at transverse joints on loading stresses and thermal stresses at the critical load position can be ignored, and the influence coefficient of dowel bars at longitudinal joints on thermal stresses is 1.02- 1.05.

关 键 词：水泥混凝土路面:传力杆 接缝传荷能力 温度应力 拉杆修正系数 

分 类 号：U416.216[交通运输工程—道路与铁道工程]