The Experimental Study Of 500MPa Reinforced Concrete Beam With Fractal Geometry

Construction structure dehiscence question is always one of topics which the domestic and foreign concerned experts pay attention. Along with "Concrete structure Design Standard" (GB50010-2002) promulgation and implementation, HRB400 (newâ…¢steel) steel bar has already been the led steel bar to promote and to apply in the engineering structure. However , 500 MPa (â…£) steel bar as anti-cut the stirrup research just to start, it possibly could appear the width slanting crack which can not to be able to satisfy the structure serviceability and durable request. Whether does the high strength stirrup concrete structure satisfy the serviceability and durable request in the normal operational phase is always one of project application matters of concerning.The article made eight high strength stirrup concrete T the shape section beams experimental study, and analyzed that reinforced concrete beam produce crack with the developing process and the dehiscence pattern under the centralism load, and mainly discussed the different influence factor in this foundation and analyzed the influence of experimented beam dehiscence, the crack opening, the deflection and so on under the load way, the concrete intensity, the steel bar intensity to, discussed whether experimented beam satisfy the biggest crack opening limiting value in the use load stage.At the same time, in the experimental foundation, using the existing data and crack chart to analyse the sample in the slanting crack appearance, the growth as well as the evolved distribution characteristic with the fractal geometry theory. The result indicated that, The fractal theory has the very good quantification relations to the slanting crack from the similarity, to excel in stirrup reinforced concrete beam sheared in inclined crack forecast.Finally this article compared experimental study of 8 HRB400 and 8 500 MPa high strength stirrup T shape section simple beam under centralism load function. with the aid of the stage crack distribution map in the experiment under the different load, with the fractal theory carries the slanting fracture density, the shearing force, the amount of deflection and the fractal dimension relations on the analysis contrast, which is from the concrete crack developing various stages of the sample. The research indicated that, Two kind of high strength reinforced concrete component all has the very good stability and promoted application prospect, at the same time the fractal dimension and the shearing force, the amount of deflection, as well as the crevasse degree has the explicit quantification relations which enriched this experimental research.