Analysis on Deck Replacement Plans of tied arch bridge with composite girder

Bridge decks in composite bridges endure directly local vehicle load and failure is apt to occur in bridge decks, so the decks in Jiubao Bridge are designed to renewable component. Space finite element model of Jiubao Bridge was established. Stress variation of upper and lower edge of the girder under dead load was analyzed when each deck changed locally. Stress variation processes of various whole span replacement plans were also analyzed and the stress envelope was obtained. The calculation results show that local bridge deck replacement has no obvious influence on the steel girder stress. While the plan that remove bridge decks from mid-span to arch foot has less influence on the girder stress compared to other whole span replacement plan.