Research On Bearing Capacity Based On Redistribution Of Transverse Load Distribution Of Damaged RC Bridge

In the article, based on the investigation on the typically old bridges and their current situation in the Zhengzhou city,it proposes about the relevant issues that influence the bearing capacity of reinforced concrete bridges. In our country, the massive reinforced concrete T beam bridge and the prefabricated concrete bridge were built using the prefabricated installment practice in the 1990s'county- township road and on the recent years construction's highway.After being put into use, these bridges generally presented the crosswise relation weakness or degeneration and so on. There are two main types:â‘ the concrete where horizontal beams connect each other falls off, the steel plates of connection separate and even fall off;â‘¡the flanges are not continuous, and there are the longitudinal cracks in the flange junction. The vehicles load vibration function causes single beam to bear a significant force, especially under the current frequent heavy load transportation, this would affect safety and durability of the bridge.Not only the transverse load distribution is an extremely important concept in the bridge design, but also it plays a crucial role on the bridge system evaluation of injury and the bearing capacity. Making use of internal force or transverse load disrtibution coefficient to analysis bridge surteture , in essence, is within a certain range of error to look for an approximate influence surface to replace the precise influence surface, namely making the internal force calculation's problem of the spatial structure reasonably convert into the flat surface problem to resolve.This paper used the simple T beam bridge as a example of theoretical analysis, first, based on the transverse connection form of the T beam bridge, the existing traffic conditions, application of simplified methods, while using different units to establish the simply supported T beam bridge finite element model and Truss finite element model, and calculated horizontal beam force status, then maked the damaged position assumptions of the beam according to its force status. And the paper first maked a reasonable grouping of horizontal beam damaged conditions, and haved the complicated damaged conditions show a regular arrangement. That first considered the lateral beams worst bending at all the destruction, that is the vertical direction damage, and then consider transverse possibl e damage, so this would be relatively simple analysis of the problem, and also help draw law. According to the injury Conditions, building element model finite element to calculate and analyze, comparing with the damage status of the test report of the bridge, and finally with the design value, obtained the calibration factor of the transverse distribution coefficient, to attain the bridge condition appraisal in extreme limit force or normal usage appearance.