Study On Anti-crack Of Steel Plate Concrete Shear Wall In Super High-rise Building

As the development of society and the improvement of construction technology, superhigh-rise buildings appeared frequently, and became the landmark of a city.Because theheight of high-rise’ structure and the load is larger, so the thickness of the bottom shear wallis generally above0.8meter, much of them belongs to mass concrete structure, and in order toimprove the bearing capacity, the wall usually is designed as the steel-reinforced concretestructures. At present,the domestic and foreign research at super high-rise structure moreconcentrated on two aspects: temperature stress of large volume base raft, anti-seismicproperty of steel frame-reinforced concrete core canister，and less on the temperature stressof super thick steel plate shear wall and uncoordinated deformation between the steel andconcrete. This paper focuses on the transient temperature stress field of super thick steel plateshear wall and structure cracks caused by the uncoordinated deformation between the steeland concrete.This Paper based on the former research of mass concrete,elaborated the characteristicsof shear wall cracks in super high-rise structure, and summarized the causes of the cracksfrom three aspects:the material，design and construction. Then combining previous researchresults, introduced the formula of cement hydration heat、adiabatic temperature rise,coolingtemperature rise,cooling curve of concrete, and finite element calculation method of transienttemperature stress field in mass concrete.This paper used the finite element analysis software ANSYS,made an simulationanalysis of the transient temperature stress field of shear wall of one super high-risestructure in high-tech area after casting in ten days.During the process of the simulationanalysis,this paper considered the relationship between the time and atmosphere temperature,generation rate of concrete hydration heat, elastic modulus, tensile and compressive strengthof concrete, so as to achieve the transient of temperature stress field.In order to study the effect of the existing of steel plate on the distribution of structuraltemperature field and the influence of the thickness of steel on the uncoordinateddeformation between steel and concrete，this paper analysed the transient temperature field of three different plate thickness (0.04m,0.07m,0.10m) in the shear wall combined withpractical engineering. The conclusions are as follows: the results of the analysis are actuallyfitting with the engineering;the thicker the steel plate is,the larger the whole deformation andthe uncoordinated deformation between steel and concrete is,then easily causing the crack ofstructure.