随机车辆荷载流下UHPC加固正交异性钢桥面板疲劳性能评估

疲劳开裂是正交异性钢桥面板常遭遇的病害之一,而其与桥面铺装刚度较大使得关键细节应力幅过大密切相关,因此,利用UHPC提升桥面铺装刚度是缓解疲劳应力的重要手段.为研究实际车流作用下的关键细节的疲劳性能,以跨沿洛河某公路斜拉桥为例,开展了钢-UHPC组合铺装正交异性钢桥面板构造细节的应力影响面分析,并利用监测记录的实际车流...

Evaluation on Fatigue Performance of Orthotropic Steel Bridge Deck Reinforced by UHPC under Random Vehicle Load Flow

Fatigue cracking is one of the common diseases of orthotropic steel bridge deck, which is closely related to the excessive stress amplitude of key details caused by the stiffness of bridge deck pavement. Using UHPC to improve the stiffness of bridge deck pavement is an important means to alleviate fatigue stress. In order to study the fatigue performance of key details under the action of actual traffic flow, taking a cable-stayed bridge along Luohe River as an example, the stress influence surface analysis of structural details of orthotropic steel deck with steel UHPC composite pavement was carried out, and the structural details were loaded by the actual traffic flow recorded by monitoring to obtain the stress spectrum; Based on miner fatigue damage equivalent principle, the maximum stress amplitude, equivalent stress amplitude and fatigue loading times are calculated. The results show that UHPC can significantly reduce the stress of structural details, improve the mechanical behavior of structural details, and significantly reduce the stress amplitude of structural details on the panel, so that the maximum stress amplitude recorded in the structural details of longitudinal rib panel weld and panel butt weld is less than the constant amplitude fatigue limit.