水泥混凝土桥梁长寿命桥面铺装层复合结构疲劳特性  

Fatigue Performance of Composite Structure for Perpetual Pavement on Cement Concrete Bridge Deck

作　　者：钱振东[1] 王江洋[1] 王亚奇[1] 

机构地区：[1]东南大学智能运输系统研究中心,江苏南京210018

出　　处：《中国公路学报》2012年第5期67-73,共7页China Journal of Highway and Transport

基　　金：国家自然科学基金项目(50578038);教育部新世纪优秀人才支持计划项目(NCET-08-0118);教育部高等学校博士学科点专项科研基金项目(20090092110048)

摘　　要：为了构建疲劳性能优异的水泥混凝土桥梁长寿命铺装结构,借鉴长寿命沥青路面设计的基本思路,选取3种铺装复合结构方案,采用应变控制的四点弯曲疲劳试验,并基于Weibull分布理论对复合结构的疲劳特性进行分析,建立长寿命桥面铺装复合结构双对数疲劳预估方程。研究结果表明:3种铺装复合结构的疲劳寿命均服从双参数Weibull分布;在失效概率为0.1时,复合结构上面层同为AC,下面层采用环氧沥青混合料(EAM)代替SMA后,其疲劳性能得到提高,复合结构下面层同为EAM,上面层采用SMA代替AC后,疲劳性能得到再次提高;"EAM+SMA"的组合具有较好的抗疲劳性能,同时满足长寿命桥面铺装的结构最优设计特点,为今后长寿命桥面铺装相关研究提供了基础。In order concrete bridge, to design the perpetual pavement with excellent fatigue behavior for the cement based on the characteristics required for perpetual road pavement, three composite structures were tested with four-point flexural bending test to investigate fatigue properties based on the Weibull distribution theory. The double-logarithm fatigue equations for perpetual pavement were established. The results show that the fatigue lives of three composite structures follow the double-parameter Weibull distribution. With the failure probability of 0.1, the fatigue performance of composite structure, when the lower layer is AC while the lower layer uses epoxy asphalt mixture （EAM） as a substitute for stone mastic asphalt （SMA）, is improved significantly. In addition, the fatigue performance of composite structure, when the lower layer is EAM while the upper layer uses SMA as a substitute for asphalt concrete （AC）, is improved more. The combination structure of EAM and SMA has the best fatigue performance, and totally satisfies the structure design feature requirement for perpetual pavement. The research results provide a reliable foundation for the further study of the perpetual bridge deck pavement.

关 键 词：桥梁工程 长寿命桥面铺装 四点弯曲疲劳试验 疲劳特性 WEIBULL分布 

分 类 号：U443.33[建筑科学—桥梁与隧道工程]