The degradation mechanism of performance of prestressed concrete cable-stayed bridges based on main girder damage
LIU Jiwen
YANG Guangjun
JIANG Zuoqian
YANG Shilong
SONG Tao
Abstract：To study the degradation mechanism of the mechanical performance of the main girder of a prestressed concrete cable-stayed bridge under the action of vehicles and external factors,the cable-stays are equivalent to elastic supports.Using an equivalent three-span continuous beam as the basic structure,the analytical expressions for the degradation laws of cable force,bending moment,and deflection of the main girder after damage are derived.The research results indicate that after damage to the main girder,the cable force near the damaged area of the main girder increases;the changes in bending moment and deflection of the main girder primarily occur in the damaged span.Case studies validate the effectiveness of the theoretical calculation results on the degradation of the mechanical performance of the prestressed concrete cable-stayed bridge after damage to the main girder,which can be used for assessing the mechanical performance of the main girder after damage.
Keywords：prestressed concrete deck cable-stayed bridgedegeneration mechanismmain girder damagecontinuous beam
Publication Date：2025-05-30
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：10( 43-52 )