中文摘要：

为了研究薄层超高性能混凝土（UHPC）-钢轻型组合桥面结构的车桥动力性能，依托广东佛陈新桥工程（一幅桥采用轻型组合桥面，另一幅桥采用传统沥青铺装钢桥面）。在钢桥易出现疲劳的位置布置动态应变传感器，进行了大量的跑车动力试验，记录标定车驶过桥面时各测点的时程应变，采用雨流法统计各疲劳细节处的应变幅，汇总试验结果并结合有限元模型，分析了两种钢桥面体系在车辆动力作用下的受力特性。结果表明：轻型组合桥面各测点时程应变的变化规律与传统沥青铺装钢桥面相同；相比于传统钢桥面，轻型组合桥面的车桥动态受力水平较低，其中弧形切口的应变幅降幅最大，达到了23．8％。总体表明：轻型组合桥面未改变传统沥青铺装钢桥面车桥动力受力形式，但能够有效地降低钢桥面的车桥动力响应。

英文摘要：

In order to study the vehicle-bridge dynamic performance of lightweight steel-UHPC （ultra-thin high performance concrete） composite deck, a series of real bridge tests are conducted on Fochen new bridge in Guangzhou Province （the south bound bridge utilized the newly-developed composite deck, and the north bound bridge employed steel deck using conventional asphalt layer） . Dynamic strain sensors are installed in the fatigue-prone locations of the bridge. The dynamic test of calibration vehicles passed across the bridge is conducted for many times, the strain responses versus time at fatigue details are recorded by rain-flow method to analyse the mechanical performance of these 2 deck systems under vehicle-bridge interaction by combining field test and finite element model. The result shows that （ 1 ） the 2 deck systems have the same strain variation trend at each measuring point; （2） the dynamic mechanical amplitudes of lightweight composite deck are smaller than those of the conventional steel deck, among all these details, the strain amplitudes at web-cutouts reach the highest deduction up to 23.8%. Hence, lightweight composite deck can effectively reduce vehicle-induced dynamic interaction Without changing the stressed system of the steel deck with conventional asphalt layer.