Analysis on Bending Performance of 40 m Box Girder for High Speed Railway Based on Finite Element Method
The 40 m box girder for High Speed Railway features excellent structural performance and good engineering adaptability,which can significantly reduce construction cost of substructure especially when applied in the western mountainous areas with many valleys and rivers.In order to gain a deeper understanding of the bending performance of the 40 m simply-supported box girder for High Speed Railway,this paper conducts a three-dimensional finite element analysis using a concrete plastic damage model,and verifies the model with reference to existing static load bending test results.Before cracking,the deflection-load curve of the 40 m box girder for High Speed Railway exhibits a linear relationship,and the distance between neutral axis and girder bottom is about 2,130 mm.After cracking,the deflection-load relationship becomes a slightly convex curve,and the neutral axis rises continuously with the increase of loading value.After reaching a loading level of 2.00,the neutral axis rises to the joint between web plate and top plate.After the cracking of the box girder,the vertical bending cracks and diagonal bending shear cracks developing in the bottom plate and web plate of the mid-span box girder,as well as the diagonal web shear cracks within 1/4 girder length from the girder end,can be evaluated based on the damage factor.Based on the finite element analysis,it can be seen that the 40 m simply-supported box girder for HSR has good post-cracking plastic performance.
high speed railway40 m box girderbending performancefinite elementplastic damage model
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