Research on ultimate bearing capacity and mechanical properties of new steel piers for railway
To address issues with self-importance,slow construction,and non-reusability of traditional concrete piers for temporary beams,a new type of steel pier has been proposed.The structural safety and mechanical properties of the steel piers were studied using a finite element model to analyze their ultimate bearing capacity,force characteristics,working mechanism,and overall stress distribution.The results show that the steel pier exhibits a high bearing capacity,ensuring the reliability of the temporary beam protection system.In the elastic phase,the steel pier load and displacement are linearly related.However,in the nonlinear phase,the slope of the steel pier load-displacement curve decreases.As the load increases,the bottom plate and web plate hole wall are deformed by bolt extrusion and slip,resulting in hole wall damage from bolt punching and cutting.Therefore,it is crucial to focus on the design and construction of the bottom plate and web plate.The overall stress of the steel pier increases with the reduction of the mother plate thickness.However,the thickness of the stiffening rib has less effect on the stress of the steel pier.Based on the finite element analysis under yield load,the suggested values of the mother plate and stiffening rib thicknesses are given to achieve the reasonable utilisation of the steel properties.This study provides useful insights for the engineering application of steel piers.
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