Study on the Stress Performance of Existing Continuous Girder Bridge Strengthened by a Low-Tower Cable-Stayed System
As the service life of large-span prestressed concrete continuous girder bridges increases,issues such as web cracking and mid-span deflection often arise.To address these problems,this study focuses on a three-span continuous girder bridge,examining its stress state before and after strengthening with a low-tower cable-stayed system.Using finite element simula-tions,the bridge's stress distribution and deflection were compared between pre-and post-strengthening conditions,thereby as-sessing the overall effectiveness of the strengthening scheme and the local stress state in both the tower-girder anchorage and the pylon anchorage zones.The results indicate that,after applying the low-tower cable-stayed system,the mid-span deflection decreased from 72.61 mm to 22.25 mm,and the main girder transitioned from partially tensile sections to fully compressive sections.Following reinforcement,the overall stress distribution in anchorage regions(such as diaphragms and box girder top slabs)remained reasonable;only a very limited area exhibited stress concentrations,which can be mitigated by additional rein-forcement measures.These findings verify the feasibility of the low-tower cable-stayed system as a strengthening method for existing continuous girder bridges.
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