Mechanical Analysis On The Steel-Concrete Combined Segmengt Of A Long-Span Continuous Rigid Frame Birdge

Comparing the steel-concrete structure with the structure made of steel or concrete single material, steel-concrete structure can improve the stiffness and stren-gth of the structure, reduce the impact coefficient, save material, reduce costs,an-d has the advantages of significant technical and economic benefits. But prestre-ssed concrete bridge appear across as too much weight in the lower scratch,need to study the combination of steel-concrete bridge structures to avoid this si-tuation. In this paper, a bridge is taken as engineering background. Researchand analysis of steel-concrete composite section of the internal forces, stress dist-ribution and structure of the force transmission mechanism This bridge is a ste-elconcrete combination structure of continuous rigid frame bridge with large sp-an, thespan arrangement is98m+220m+98m, and the steel mix designed length is1.5m. In the design of the bridge, the combination segment is adoptedthe structure of the chamber after filling concrete plate. In this paper, first ofall, by establishing the whole model of real bridge, the ultimate bearing capaci-ty under the6combination conditions is calculated, and then the three dimensi-onal finite element model was established to analyze local stress mechanism ofthe steel concrete composite section, In this paper, we mainly completed the re-search about several aspects of content.The first, on the basis of available information, the whole real bridge finiteelement model is established through Midas-civil software. Through local analysi-s of the real bridge finite element model, the internal force value for Ansys an-alysis is determined and then using the latest specification, the conditions comb-ination is calculated. According to specifications, conditions were combined.Theconcrete box girder, steel box girder, steel-concrete composite joint stress distri-bution were analyzed and compared through the local Ansys model. Analysisresults show that in the most unfavorable conditions, the various parts of the st-ress distribution is in line with the expected results, and the stress distributionis regularly, the force is evenly. Analysis calculations can be served as aguidefor the model test, and also a reference for the actual construction and designoptimization.Second, By analyzing the stress distribution in the model structure, the proposed combination of steel-concrete sections using a large proportion of total cr- oss section1:2model of static load test program. Ansys finite element analysisbased on the situation after the stress distribution is proposed layout measuringpoint program for the model test test preparation.