Bridge Plate Truss Composite Structure System Load Stress Distribution And Experimental Research

Plate truss composite structure is composed of bridge deck and the truss joint force,because the structure has good overall performance and efficiency become the choice ofmost of the bridges, Considering the characteristics of orthotropic steel deck, highstrength, light weight, low building height, structure, construction convenientinstallation is adopted, so the plate truss composite structure has become the best choicein the world each big, medium span bridges.This paper studied on the watergate East Yangtze River bridge Chongqing cityunder construction, Focus on the structure under the cable-stayed action,bridge analysisthe stress of upper structure, such as bridge panel, stiffener, stringers,chord memberand beam.Using Midas FEA finite element analysis, and according to the constitutiverelations of materials, along the bridge cable force generated on each member to theproportion of each component to bear; horizontal component of cable. The constructionphase is also corresponding bridge test to each member of the bridge, the constructionsite layout of sensors, data collection and test the results of finite element analysis andreal bridge analysis and comparison of results, verify the reliability of finite elementanalysis and accuracy.The results of the study show that, under the action of the upper deck cablecomponents with increasing compression, cable distance, uniform, the stress increases,the cable hole behind the location, bridge deck are tensile, transfer and backwarddiffusion, the diffusion angle and the X was47degrees, until the last chord, stress alongalong the bridge cable for cable tension, pressure, stress condition and other upper decksimilar. The stress value increased9#cable force, the main reason is the verticalcomponent of forces of cable to generate additional bending moment of structureFinally, calculate the distribution ratio of bridge deck has stabilized the segmentaldistribution ratio in the range of28.21%~60.72%, as the member to bear the horizontalforce is biggest, the proportion of first decreased and then increased then decreased andfinally tends to be stable, accounted for about40%. The longitudinal stiffening ribbridge panel, take14.30%~20.52%, and finally the distribution ratio stable at about17%. In the longitudinal the largest proportion reached39.13%, there is no substantialchanges in the12%. The distribution proportion of top chord increases first and then decreases and then increases is the wave changes, the distribution ratio in10.52%~32.5%.The horizontal component of cable force forward, gradually reduce. Divide theforce of cable distribution proportion of water, proportions and chords bridge deck,upper chord segment maximum in the current ratio of45.6%~58.61%, section nextwhen the proportion is33.4%~40.6%, is subjected to the largest proportion of the. Inthe longitudinal proportion decreases with the distance increasing, finally basicallystable at around16%, bridge deck stiffened and finally tends to be about15%.Horizontal force distribution of upper chord members take up, then the bridge panel,stringer bear larger proportion than in longitudinal stiffening rib.