Abstract
Orthotropic steel deck (OSD) is a better choice for urban bridges and the replacement of damaged concrete slabs. Gussasphalt concrete (GAC) is usually adopted as the asphalt surfacing; however, the paving temperature of GAC is high, which will affect the fatigue durability of fatigable welds in OSD. In this study, such influence of high-temperature pavement paving was comprehensively investigated based on in-situ monitoring and numerical analysis. The temperature of OSD and displacement of bearings were investigated based on the monitored data and numerical results. After that, the deformation and residual temperature stress of OSD during the paving process were analyzed. On this basis, the effect of residual temperature stress on fatigue damage accumulation of OSD was investigated and discussed. Results show that the uplift and expanded deformation of OSD arise during the paving process, leading to the displacement of bearings. Residual displacement of bearings, as well as the residual temperature stress at fatigable details of OSD, is observed. The residual temperature stress has considerable effect on fatigue damage accumulation at rib-deck weld. A fatigue damage amplification factor of 1.1 is recommended for taking into consideration of the adverse effect of high-temperature pavement paving.
Highlights
Orthotropic steel deck (OSD) has been widely used in long- and medium-span bridges because of their light weight, high strength, and other advantages [1]
The results address the significance of residual temperature stress in fatigue damage evaluation, especially when a precise evaluation result is needed
The differences between the monitored and numerical temperatures are within 8%: this demonstrates that the simulated initial thermal field of OSDs is reliable
Summary
Orthotropic steel deck (OSD) has been widely used in long- and medium-span bridges because of their light weight, high strength, and other advantages [1]. The monitored data are usually finite element (FE) method commonly adopted to investigate the the thermal characteristics of OSD impractical to install enoughissensors or strain gauges. Studies have assessed the effects of high-temperature pavement paving on the fatigue performance characteristics and thermal deformation of OSDs of. To accomplish the bearings-supported OSD during high-temperature pavement paving; (2) investigating the variation stress on fatigue performance of OSD during its service life. The effect of residual temperature stress on fatigue performance of was thermal analysis-based finite element model was established and verified based on the monitored fatigue performance of OSD was evaluated based on a proposed evaluating framework.
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