Fatigue damage of concrete slabs in wide box continuous composite bridge
1.College of Civil Engineering, Tongji University, Shanghai 200092, China; 2.Shanghai Municipal Engineering Design Institute Co., Ltd., Shanghai 200092, China
Abstract：Based on the vehicle load model of fatigue design, the stress history of reinforcement in the concrete slab of northern approach of Jiubao Bridge
with a multi-span continous composite bridge was obtained under vehicle load by finite element model. The stress spectrum of reinforcement was achieved by Rain-flow method according to the predicted traffic volume in the future of 100 years. Fatigue damage of reinforcement at different locations was achieved and compared to obtain the most disadvantageous place. The results show that fatigue failure of reinforcement may occur in deck slabs of steel-concrete composite bridges during service life, and the fatigue effect should be considered in the design. Reasonable lanes arrangement and small proportion of heavy truck are beneficial for fatigue performance of deck slabs.
2013, Vol. 34 
