Some Problems Of Concrete Beam Bridges Based On Life Cycle Design Methodology

At present, there is a common phenomenon existing that the bridge have disadvantages of insufficient durability and a short sevice life-cycle. This is mainly because of the traditional bridge design method, which divides the bridge construction into many steps and only pays attention on construction step, formed as a design method only considering "bridge construction completion". As a result, in order to devolop sustainably, it’s necessary to expand the traditional short-term design to the whole life-cycle of the bridge, considering all aspects on the whole life-cycle design, which covers planning, design, construction, use of management, until dismantling of the structure and recycling of materials. The paper contains as following:1) Picked reinforced concrete beam bridge and prestressed concrete beam bridge as points, the paper analyzed comprehensively the main defect and damage phenomenon, mechanism and the reason on bridge structure, deck, subsidiary facilities, bridge pier and foundation of concrete beam bridge. The research suggested that lacks in bridge design were main or potential reasons causing defect and damage, which laid a good foundation for following bridge life-cycle design.2) The paper discussed preliminarily the basic frame of bridge life-cycle design theory, compared and analyzed the differences between bridge life-cycle design method and the traditional one. What was more, it described details about the basic concept, design principle, main content and design process of bridge life-cycle design theory covering bridge service life-cycle design, property design, nutrition design, aesthetic design, enviromental and ecological design and cost analysis, which built a more complete bridge life-cycle design theory frame.3) Baed on defect and damage of concrete beam bridge and cominbined the characters of prestressed concrete continuous beam bridge, the paper verified the practical application of bridge life-cycle design through taking Kashite Shufu bridge in Xinjiang province for instance, which tried to show the advantages of bridge life-cycle design theory on improving sevice life-cycle and saving cost. At the same time, it gave a reference for further bridge design.