Research on anti-overturning of curved box girder bridge with single column pier based on the addition of piers and columns
In recent years,overturning accidents involving curved girder bridges with single-column piers have occurred frequently,underscoring the critical engineering significance of conducting anti-overturning analysis and developing effective reinforcement strategies.This study focused on a specific ramp bridge,evaluating its anti-overturning stability by using the bearing failure method and finite element analysis software Midas/Civil.A flexible girder lattice finite element model was established to compare and analyze the anti-overturning stability and dynamic characteristics of the curved girder bridge before and after reinforcement.The results indicate that,prior to reinforcement,the first-order mode of the curved box girder of the ramp bridge exhibited torsional vibration,particularly prone to torsion at pier 4,potentially leading to bearing voids.The minimum anti-overturning stability coefficient was found to be 1.97,failing to meet the required minimum of 2.50,thus indicating insufficient anti-overturning capacity.Post-reinforcement,with the application of additional piers and columns to pier 4,the first-order mode of the curved box girder shifted to longitudinal bending vibration,and the minimum anti-overturning stability coefficient increased to 4.31,demonstrating a significant enhancement in anti-overturning capacity.The efficacy of the reinforcement was further validated through an on-site static load test,which confirmed the positive impact of the implemented measures.
single column piercurved box girder bridgeapplication of additional piers and columnsanti-overturning stability factor
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