Creep And Shrinkage Effect Of The Trussed Combination Arch Bridges

Nowadays, as traffic volume increased, bridges built in last century cannot match the need of vehicle flow anymore. In addition, because of bad integrity and weakness in potential of bearing capacity, a lot of disease occurred in TrussedCombination Arch Bridge, that cannot meet the requirements of normal use. It is very important to strengthen this type of bridge. This paper based on western traffic science and technology project<The Disease causes and the Strengthening methods research of TrussedCombination Arch Bridge>,researched the diseases and shrinkage and creep effect on bridge diseases about TrussedCombination Arch Bridge,and carried on the related research, the main research contents and conclusions are as follows:This paper analyzed the component and stress characteristics ofTrussed Combination Arch Bridge. Based on the research results of this paper, it can summarize that disease centralized in mid.span of external chord, big and small nodes, vault, skewback, bridge deck and micro.bend plate. Main disease characteristic that influence the structure is the massive cracks, especially on the lower margin of vault, mid. span of external chord and micro.bend plate.Based on a scientific survey, the general diseases and characteristic diseases of trussed combination arch bridges are summarized. And the technical condition of the surveyed bridges are calculated with a scientific method.FEA models of several trussed combination bridges are built and the results are as follows.The longer the shrinkage and creep time is, the heavier the influence on deformation and stress is; The older the concrete age of loading is, the smaller the deflection and stress caused by shrinkage and creep are; The deflections of different diagonal forms caused by creep are basically the same under similar conditions; Using cable can reduce the deflection caused by shrinkage, comparing with using rigid rods; The deflections and stresses calculated according to04code and85code are basically the same; The results calculated respectively according to standards algorithm and given numerical curve algorithm are similar, and the results calculated respectively according to aging theory correction algorithm and original aging theory algorithm are similar, but the first two are tally with the actual situation. It is observed that the influence of shrinkage and creep on trussed combination arch bridges is ascertained, and the analyze and investigation the this influence are quite essential.