中文摘要：

为探究轻型组合桥面板UHPC薄层中小尺寸栓钉连接件的静力和疲劳性能,对总计6个试件进行了静力加载和疲劳试验.基于显式动态分析方法,采用ABAQUS软件进行了静力推出试验的数值分析;随后又设计9个正交试验开展了栓钉参数分析及特征值影响因素显著性分析.最后,基于一个实际工程,对轻型组合桥面板中小栓钉连接件的疲劳强度进行验算.结果表明：（1）UHPC薄层中的小栓钉仍具有较好的承载力,其承载力设计值可偏安全地按照Eurocode-4规范的计算式取值,即Pd=0.8As fu/γv.（2）UHPC薄层中的小栓钉承载力主要受栓钉的直径和屈服强度影响,滑移特征值主要受栓钉的高度影响,抗剪刚度主要受栓钉的直径影响.（3）疲劳试件破坏前的很长一段时间内,滑移量增长缓慢且增量较小,在试件疲劳破坏阶段,滑移值增速较快且增量明显.基于断裂力学方法的栓钉疲劳寿命估算值与实测值基本吻合.（4）小栓钉连接件的疲劳强度满足洞庭湖二桥轻型组合桥面板的设计要求.

英文摘要：

Static and fatigue tests are conducted on 6 specimens to investigate the static and fatigue properties of small stud shear connectors embedded in thin UHPC layer for lightweight composite bridge deck. The dynamic explicit analysis method is employed to conduct numerical analysis of static tests by ABAQUS software. Then, the parameter analysis and the significance analysis of the factors influencing eigenvalue are carried out based on 9 orthogonal tests. Finally, the fatigue strength of small stud shear connectors for lightweight composite bridge deck is calculated and checked based on a practical project. The result shows that （1） for small stud shear connectors embedded in thin UHPC layer, the shear capacity is reliable, and its design shear capacity can be conservatively calculated according to Eurocode-4, namely Pd=0. 8 As fu/γv;（2） the shear capacity is mainly influenced by the diameter and yield strength of stud shear connectors, the eigenvalue of slip is mainly influenced by the height of stud shear connectors, and the shear stiffness is mainly influenced by the diameter of stud shear connectors; （ 3 ） there are no significant change in slip for a long period of time before failure of the specimen, the growth rate of slip is fast and the increment is obvious. The estimated value of fatigue life based on fracture mechanics method is consistent with the result of fatigue test;and （ 4 ） the fatigue strength of small stud shear connectors satisfies the requirements of the lightweight composite deck of the Second Dongting Lake Bridge.