Shrinkage And Creep Of Concreteand The Ways Of Construction Leveling Of Super High-rise SRC

Steel reinforced concrete structure and steel cube concrete structure as the typicalrepresentative of the composite structure, which are usually used in the ultra-high-levelstructure by designers due to their superior characteristics since they were invented. Ithas been sixty years since China introduction reinforced concrete structure from theSoviet Union in the fifties of last century, but this kind of structure system is widelyused in the domestic begin from the eighties of the last century. In addition, theresearching to SRC in domestic start form thirty years before, there is some aspects arenot sufficient. In order to meet the domestic construction industry and in theoryfollow-up, this paper is to further study the structure of SRC based on the previousresearch results.In steel reinforced concrete structure, the stress of concrete which wrapped the steelwill transfer to the steel in the process of concrete creep and shrinkage, making thestress of steel increase and the stress of concrete in decrease, which will influence theconcrete creep and the interaction between concrete and steel. The mutual couplingeffect between the steel and concrete makes the stress of steel and concrete don’t matchwith the result of design. In this paper, the theory of creep and shrinkage of concrete hasbeen used to derivation when considering the construction process, the elastic modulusof concrete time-varying and so on, obtained the theoretical derivation formula of theactual stress of the concrete and steel at each time point. And then establish a programin matlab, using which we can obtain the actual stress of concrete and steel and thepercentage of axial force of each part in any cross section of the column from the timeof construction to anytime when after structure has been built. In this paper, the programalso be used to analyze the affection of the high of structure and the percentage of steelin the concrete to the stress distribution in the column.Different construction leveling on the structure may have certain influence on thevertical deformation, vertical deformation difference and the internal forces of thehorizontal elements, and the traditional leveling method can’t make the actual high ofthe structure storey match with the result of the design. In this subject, the author usethe software of sap2000to simulate a high-rise steel reinforced concrete structure of600m high to analyze the effect of three construction leveling, and then comparing therelationship all of them and giving the law of its impact. Based on layer to layerconstruction leveling process, the formula been derivate by the theoretical to abtain thereserved length of each story so that the actual high of the structure is the same with thedesign.In structural analysis (seismic analysis), structural engineers usually do not take into account the effect of the floor in order to reduce the computation time. But in the actualstructure, the horizontal floor can strengthen the top flange of beam, thus it is differentof the vertical deformation and the vertical deformation difference when whetherconsidering the effect of floor or not. This topic using sap2000to simulate a high-risesteel reinforced concrete structure of300m high to analyze the effect of floor when doesnot consider the floor plane stiffness, consider the floor plane stiffness and the beamstiffness amplification, then contrast the results of the calculation to give the affect sizeof the floor to the vertical deformation and the internal force of the horizontalcomponents of the structure.