The Control Techniques Of Temperrature Crack In Mass Concrete Baseplate

Present research status about the crack control in mass concrete construction in home and abroad is generalized in the paper, and the present crack conctrol methods in mass concrete construction are analyzed, then the methods what acts in the way of resist,release and prevent are put forward to solve the temperature crack problem in mass concrete baseplate,which are simulated and analyzed through the FEA software,ANSYS.The research contents mainly include : First, the calculated equations of the temperature field and stress field in mass concrete baseplate are deduced, and the contribution of reinforecement for the stiffness matrix in finite element computation is taken into account. Second, several temperature factors which can influnence the temperature stress of mass concrete are analyzed. The control of temperature can control the temperature stress and consequently control the temperature crack of mass concrete. The influence degree of temperature factor can be got through the finite element simulantion computation. Third, the influence of the crack resistance ability of mass concrete baseplate which takes the reinforcement as a part is analyzed, and the best suited volume ratio of reinforcement is figured out, at one time the layout of reinforcement with the same volume ratio can also affect the crack resistance ability of mass concrete baseplate. Fourth, the way that a steel plate is layed under the concrete baseplate is brought forward for the reinforced way using bonding steel plate,which is analyzed through the FEA software,ANSYS, the temperature field and stress field are figured out when the steel plate have been layed under the concrete baseplate. The influence of the temperature stress of concrete baseplate and the shear stress on contact face by the thickness of steel plate is analyzed. And then the impervious ability of the concrete baseplate is figured out when the steel plate is used as a impervious material.As the reseach displayed,utilizing the methods of resist,release and prevent at the same time,which can better prevent mass concrete baseplate from cracking, the reseach is summarizes in the paper at last, which can gain some referenced valuable conclusion and the problem what should be studied further are put forword in the end of the dissertation.