UHPC铺装正交异性钢桥面板纵肋-面板焊缝构造细节的疲劳研究
Fatigue evaluation of rib-to-deck welding detail on orthotropic steel bridge deck with UHPC overlay

为研究UHPC组合桥面铺装下纵肋-面板构造细节的疲劳性能，开展随机车流作用下的佛陈扩建西桥疲劳试验。研究结果表明：纵肋-面板构造细节面板侧应力幅显著小于纵肋侧，说明UHPC桥面铺装显著增大了桥面刚度，减小了面板的局部应力响应，并显著减少了通行货车对面板的疲劳加载次数。纵肋-面板构造细节能清晰地分辨每个单轴，也即货车每个轴均能产生一个应力幅。在当前随机车流作用下，纵肋-面板构造细节的最大应力幅都小于其常幅疲劳极限，可知佛陈扩建西桥纵肋-面板构造细节具有无限疲劳寿命。
In order to study the fatigue performance of rib-to-deck welding detail at orthotropic steel bridge deck with UHPC composite overlay, field tests were carried out on the Fochen West Extension Bridge under random traffic flow. The research found that the stress level at deck side is clearly lower than the rib side at rib-to-deck detail, which indicates that the UHPC composite structure significantly increases the stiffness of the deck plate system, and hence not only reduces the stress level, but also decreases the fatigue loading cycles at deck plate side. It is also found that the rib-to-deck detail can clearly identify each truck axis when directly loading on it, which means each passing truck axis can product one loading cycle. It is concluded that under the current traffic flow, the monitored maximum stress range at all locations is lower than the constant amplitude fatigue limit of the detail, therefore the infinite life at the rib-to-deck welding detail is expected on the Fochen West Extension Bridge