Influence of backfilling construction on mechanical performance for soil-covered corrugated steel arch bridge

On the basis of finite element software and the parameters of arch bridge in Inner Mongolia, 2D beam element beam3 was used to simulate corrugated steel, 2D solid element plan42 was used to simulate backfilling soil, and a plane model based on the interaction between backfilling height and arch ring was set up. The bending moments and axial forces of arch ring under different backfilling heights were calculated, and the influence of backfilling height on the stress and deformation of arch ring was analyzed. Calculation result shows that during symmetric backfilling construction process, the maximum radial absolute displacement of arch ring is about 0.9 mm, and the maximum and minimum stresses of arch ring are about 10, -27 MPa respectively. During asymmetric backfilling construction process, the maximum radial absolute displacement of arch ring is about 1.4 mm, the maximum and minimum stresses of arch ring are about 12, -18 MPa respectively, and the maximum radial absolute displacement and the maximum stress appear at 1/8 span on the right of arch ring. During backfilling construction process, the stress and displacement at 1/8 span on the right of arch ring must be mainly monitored.