The Influence Of Initial Stress For Ultimate Bearing Capacity Of The Skeleton Of Concrete Structures

Concrete filled steel tube and reinforced with concrete in bridges is mainly used inarch bridge，the construction process is the first the stentless construction steel pipe steelstiff skeleton arching，and then perfusion steel pipe concrete, finally, around the steelpipe reinforced with concrete arch steel banding and pouring concrete. Under this kindof construction method，the weight of the steel pipe steel reinforced with、wet weight ofthe core concrete and construction load factors. Steel pipe reinforced with concrete andoutsourcing concrete as a composite structure under load before, initial stress and initialstrain in the steel pipe reinforced with concrete, reinforced with initial stress will affectthe ultimate carrying capacity of the arch bridge.In this paper, relying on being served Guangyuan Zhaohua the Jialing steelreinforced with concrete reinforced concrete arch bridge, reasonable assessment of thecarrying capacity of the main arch members, with large-scale finite element analysissoftware Midas FEA simulation finite element model constructed reinforced withconcrete short columns member effect and resistance effect to the objectives of thestudy，were reinforced with reinforced concrete arch bridge carrying capacity evaluationof the whole process of destruction model，and extract the finite element analysis.The main contents are as follows：�'�Using nonlinear stress and strain of steel and concrete constitutive model, tochoose their own literature in the typical steel pipe concrete test artifacts the numericalanalysis model is established with large-scale finite element program, calculates theresults are compared with test results in the existing literature, to verify the numericalmodel for modeling method and the rationality of the parameter selection, for steel tubeconcrete strength concrete framework provides modeling basis for the establishment ofthe numerical model.�'�Using large-scale finite element program set up concrete strength sexualskeleton concrete filled steel tubular short column structural ultimate bearing capacitynumerical analysis model of external package of concrete and the core concrete andsteel tube in force in the process of performance analysis, obtained the artifacts underlimit state failure pattern of each part.�'�Study the strength of steel tube concrete strength should be at the beginning ofdifferent sexual skeleton concrete members influence ultimate bearing capacity, bearing capacity is not more than10%, for industry, Suggestions of steel tube concrete strengthearly sexual skeleton concrete structure should be control within0.6.�'�Put forward the concrete filled steel tubular initial stress of steel tube concretestrength sexual skeleton concrete structure simplified formula of the influencecoefficient of bearing capacity，can be for reference for design and calculation of similarstructure.