中文摘要：

为获得钢-UHPC组合铺装正交异性桥面板构造细节轮载作用下的响应特征,准确评价随机车流下其疲劳敏感构造细节的疲劳性能,以佛陈扩建西幅桥为例,开展了钢-UHPC组合铺装正交异性钢桥面板全部构造细节的应力监测试验。利用7d连续记录的应力时程和雨流计数法获得了构造细节的应力谱;基于Miner疲劳损伤等效原则计算得到了最大应力幅、等效应力幅及疲劳加载次数。结果表明：当构造细节位于轮载正下方时,通行货车每个车轴将在面板上的构造细节中产生1个应力循环,但其他构造细节只能由每个轴组产生1个应力循环;钢-UHPC组合铺装虽并未改变正交异性钢桥面板构造细节轮载作用下明显的局部效应特征,但增大了正交异性钢桥面板的刚度,使得横隔板弧形切口的面外应力减小;其显著降低了面板上构造细节的应力幅,使得纵肋-面板焊缝构造细节和面板对接焊缝构造细节所记录到的最大应力幅均小于常幅疲劳极限;基于AASHTO规范开展的疲劳评价表明,在当前交通流下,佛陈扩建西幅桥钢-UHPC组合铺装正交异性钢桥面板全部构造细节具有足够的疲劳强度。

英文摘要：

In order to investigate stress behavior at various details on orthotropic bridge decks（OBDs）with steel-UHPC composite overlay,and evaluate its fatigue performance of fatigueprone details under random traffic flows,stress monitoring of all connection details on OBDs with steel-UHPC composite overlay was carried out,taken the Fochen New West Bridge as a case.The rain flow counting method was employed to obtain stress spectrum of measured details based on seven-days continuous monitoring.The maximum and effective stress ranges,as well as loading cycles were extracted by the Miner＇s rule.The results show that when the details aredirectly under the wheel loading,each axle of passing trucks produces an individual stress range on the details related to the deck plate,while only one stress range is driven by an axle group at any other details.The OBDs with steel-UHPC overlay still exhibits significant local effects under wheel loading,but the stiffness of OBDs increases,as out-of-plane stress on the cutout details decreases.Stress ranges on the details related to the deck plate significantly decreases,so the recorded maximum stress range on both the rib-to-deck detail and the deck splice is smaller than constant amplitude fatigue limits.Under current traffic flow on the bridge,all measured details of OBDs on the Fochen New West Bridge are of sufficient fatigue strength based on the AASHTO LRFD specifications.