The Nonlinear Finite ElementAnalysis On Prestressed Steel Reinforced High Strength Concrete Beam

Steel-concrete composite beams through organic combination of the concrete and steelmake composite structure give full play to the compressive properties of concrete and tensileperformance of steel, thus to achieve the purpose of saving material and improving economicbenefit prestressed steel high strength concrete beams is on the basis of using high strengthconcrete, combine with prestress technology and form a new type of structure, prestresstechnology not only can reduce the use of beam section height, save steel, but also reduce thecost. After applying prestress, it can adjust the internal force distribution of the structure,increase the flexible work scope of composite beams, and delay the time of the concretecracking, improve the performance of composite beams. The performance of all aspects willbe more superior on the basis of steel reinforced high strength concrete beams.Steel-concrete composite structure that has its superior performance gets moreapplication.There are lots of researches about ordinary prestressed steel reinforced concretemember bearing performance in the domestic and overseas, and the researches of prestressedsteel reinforced high strength concrete beams are mainly performance analysis of membershear stress and bending stress under the monotonous static load, the research of performanceof the prestressed steel reinforced high strength concrete beam under low reversed cyclicloading is few, also lack of relevant design specifications, so the prestressed steel reinforcedhigh strength concrete beam design and construction is lack of a strong theoretical support.Therefore, it is very necessary to carrying on the nonlinear analysis on prestressed steelreinforced high strength concrete beam. In this paper, combined with the existing problems,the researches of the following four aspects have be done:1. Based on high strength concrete constitutive model, the steel reinforced concretecomposite beam finite element model was established by using ABAQUS software,completed the static load analysis, put forward the correct finite element modeling met.2. The load-displacement curves obtained by static load analysis are compared with thoseof existing experiment, the two results are with good agreement, so the selection ofconstitutive model and the the modeling method are proved to be right.3. Changing some parameters of prestressed steel reinforced high strength concretebeams, such as the strength grade of concrete, the form of h-beam decorate, volume stirrupreinforcement ratio, lengthways reinforcement ratio and prestressed size, etc. To study thefactors’ influence on the performance of prestressed steel reinforced high strength concretebeams under reciprocating load, and get the influence law of these parameters on thestructural behavior.4. Based on the load-displacement curve obtained by the hysteresis analysis, andintroduce the coefficient of the cross section steel stiffness and the total cross section stiffnessratio, using IstOpt software, return to get a load-displacement restoring force model skeletoncurve of prestressed steel reinforced high strength concrete beam. Provided reference for the elastic-plastic dynamic analysis of the prestressed steel reinforced high strength concreteframe structure.