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Study of Treating Schemes For Long-Term Downwarping Deterioration of Main Girder of A Bridge
Author(s): 
Pages: 88-91
Year: Issue:  4
Journal: World Bridges

Keyword:  cable-stayed bridgedownwarpingload decrementcarbon fiber sheetbridge retrofitfinite element method;
Abstract: A Bridge was opened to traffic in 1995.Its main bridge is a cable-stayed bridge with a main span of 400 m.According to the inspection report,the downwarping of main girder in some spans had been exarcebated,the main girder concrete began to spalling,deteriations including concrete spalling,reinforcement exposure and concrete cracking were also found,the causes of which can be attributed to the surge of traffic,over load and prestress loss.To curb the exarcerbation of main girder downwarping,the way of relieving the self weight of the structure was used to partially slow down the main girder downwarping,specifically by replacing the concrete slabs in the sidewalks by the ligh weight steel plates,and the main girder was strengthened by gluing carbon fiber sheet on the base of the top plate of the box girder.The finite element software was used to establish the model of the main bridge,to calculate the effect of structural self weight reduction and carbon fiber sheets strengthening on the enhancement of main girder downwarping.The results of the calculation indicate that when the concrete slabs in the sidewalks were replaced by light weight steel plates,the downwarping of side spans adjacent to the main span and the main girder showed the sign of abating.The carbon fiber sheets joined the main girder to bear loads,which suppressed the progress of the concrete deteriotation and prevented the occurrence of main girder downwarping induced by concrete cracking,verifying the feasiblity of the retrofit scheme.
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