Experimental Study on the Fatigue Degradation of Prestressed Concrete Slabs for Composite Bridges
Wenjun Li, Rujin Ma, Yuqing Liu, Chen Liang
TL;DR
This paper studies how repeated heavy loads affect prestressed concrete slabs in bridges and proposes a new method to evaluate their fatigue performance.
Contribution
A new fatigue performance evaluation method for prestressed concrete slabs that accounts for static cyclic damage is proposed and validated.
Findings
Static cyclic damage significantly affects the fatigue performance of prestressed concrete slabs.
Applying prestress mitigates initial damage effects by compensating for cracking stress.
The proposed evaluation method predicts fatigue deformation with less than 10% error.
Abstract
Concrete slabs in composite bridges are inevitably subjected to heavy vehicular loads during their service life. To evaluate the fatigue performance of the prestressed concrete slabs in composite bridges, two full-scaled models of prestressed concrete slabs were first designed and tested, with the load amplitude was selected as the variable. To simulate the damage caused by the initial passage of heavy vehicles, this was simplified into the form of a static cyclic load. The mechanical deformation state and crack distribution of the slab were analyzed. Further, a finite-element model was established, and a parametric analysis based on the variation in loading form, such as monotonic displacement loading, static cyclic loading followed by monotonic displacement loading, and cyclic displacement loading, was conducted to discuss the performance-enhancement mechanism of prestressed concrete…
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Taxonomy
TopicsStructural Behavior of Reinforced Concrete · Innovative concrete reinforcement materials · Concrete Properties and Behavior