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本文采用AASHTO疲劳指导规范规定的疲劳车,使疲劳车以80km/h的速度通过简支空心板桥梁,用有限元程序模拟不同载重的疲劳车通过空心板梁时梁的动力响应,得到了空心板梁的位移时程曲线和拉区预应力钢筋的应力时程曲线。结果表明:疲劳车在标准载重下,空心板梁的疲劳寿命可达到1.46×109,疲劳车在1.5倍和2.0倍标准载重下空心板梁的疲劳寿命分别可达到9.2×108和8.9×108,拉区预应力钢筋能够满足混凝土规范关于钢筋疲劳的规定。
In this paper, we use the fatigue car prescribed by the AASHTO fatigue guidelines to make the fatigue car pass through the simply supported hollow slab bridge at the speed of 80km / h and simulate the dynamic response of the beam with different load through the hollow girder with the finite element program. Displacement curve of slab beam and stress time history curve of prestressed reinforcement in pull zone. The results show that the fatigue life of the hollow slab beam can reach 1.46 × 109 under the standard load, and the fatigue life of the hollow slab beam under the standard load of 1.5 times and 2.0 times of the fatigue truck can reach 9.2 × 108 and 8.9 × 108 respectively. Pu District prestressed steel to meet the concrete specifications on the fatigue of the provisions.