Study On Anti-crack Of Over-long Concrete Frame Floor

As the development of construction,the over-long concrete structure's application receives more and more attention,and is widely used. The over-long concretes' unique feature is that the length surpasses the standard limiting value,the temperature difference and the restraint cause bigger stress,and often result in structural cracks that affect the normal use. Given this situation, the crack becomes the question which the over-long concrete structure urgently awaits to be solved. At present, according to "anti-" "puts" principle, the over-long concrete structure generally through materials, design, construction, carried three-pronged approachs to conduct the crack research, this paper describes the Expand reinforcing strip's application in the over-long concrete structure.The crack's reason is very plenty and complex. Deformation temperature and shrinkage cracks have an important impact on this failure mechanism from the structural aspects of Cracks, and the kind of factors that generate 80% of the cracks can not be ignored, At the same time that the degree of restraint on the cracks also have a considerable impact. the paper on the floor from the pillars of this regard to consider the binding cracks, which were analyzed. At the same time, we use the ANSYS software to simulate the analysis of over-long concrete structure. analyzing in the four different temperature conditions, the simulation of the constrained plate column temperature stress and displacement, and crack distribution and integration points of the crushed state, through the simulation is easy to see in the column and the plate at the junction of crushed. The most obvious change in stress in the pillars supporting parts are very intense. From the numerical point of view, the whole floor, the location of the maximum thermal stress is not occurred in the middle of the floor, but at the junction of the most outer beams, and stress significantly higher than the floor near the fixed points of stress.Closely integrated with engineering practice, there are cracks in the summary control technology based on the results from the construction technology and materials, mixing ratio, and other aspects of additives used to improve the proposed expansion of measures to strengthen the band. In comparison, after pouring, the paper focus on the expansion reinforcing strip, first of all to crack analysis, again with a combination of expanding and reinforcing the basic principle of the expansion set to strengthen with the location and determine the bandwidth were analyzed.I hope this paper will have certain guiding significance to the study on the over-long concrete structure cracks.