Multi-scale analysis approach for fatigue failure behavior of steel wires of suspenders in a half-through arch bridge

摘要

A multi-scale analysis approach for steel wires of suspenders in an arch bridge is proposed. A trans-scale fatigue crack growth model from micro- to macro-scale is developed based on the fatigue failure mechanism that is applied to a real arch bridge. Maocaojie Bridge is a half-through arch bridge in Yiyang of Hunan province of China. A FEM model for the whole bridge is established by the software Midas/Civil. The tensile stresses in the steel wires of suspenders are calculated in details. Then, the trans-scale fatigue failure behaviors of steel wires are calculated. A group of a～N curves under different loading cases are obtained. The results show that the microscopic effects have a large influence on the fatigue behaviors of steel wires. The proposed model can take the microscopic effects into account. In addition, the size range treated by the proposed approach can pass a wide range from 10~(-6)m (micrmeter) to 10~3 m (kilometer).