Structural Analysis Of Expanded Hollow Plate Bridge

With the rapid development of economy in China, the existing volume of trafficincreasing on the highway, a large number of highway Bridges was put into operation earlierhave a significant reduction,it difficult to meet the increasing traffic demand, therefore, theHighway Broaden Engineering is becoming more and more important. The bridge loadstandards have always been improved after expanding roads, so, the old bridges should bewidened to meet the needs of traffic. To the bridge widening engineering, old and new bridgesand there splicing sites will generate additional inner force, it was caused not only by theirstructural weight and two dead load effects but also by foundation settlement, shrinkage andcreep of concrete and car load. This thesis takes a simple hollow plate bridge as an example,According to the types of broaden bridges and the splicing methods, a summary of wideningbridge is given. Build the bridge model by the finite element analysis software MIDAS,calculate the transverse load distribution and the horizontal distribution of internal forcesbefore and after widening bridge according to different way of splicing methods，The resultsshow that internal forces of old bridges’beam under loading are reduced after widening, rigidconnection is conducive to the overall stress of the bridge. Calculate and analysis theinfluence of shrinkage and creep of concrete in superstructure and the surface of itsconnecting. The results show that new bridge should be shelved90days after establishedbefore forming with old bridge. Calculate and analysis the influence of different settlementbetween the old and new bridge foundation in superstructure and the surface of its connecting,bearing capacity of the old bridge should be the main checking beams near the seam, and bothends of the settlement should be based on the forces generated for the most unfavorable loadto analyze the influence of foundation settlement. The results can provide a useful referenceon the design of hollow plate bridge’s expansion.