Experimental Research On Shear Behavior Of Beams With 500MPa Stirrup Under Uniform Load

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 used as principal bar to promote and to apply in the engineering structure. However, 500MPa (â…£) steel bar as anti-cut the stirrup research just to start, it possibly appear the diagonal crack width which can not to be able to satisfy the structure serviceability and durable request.Eight 500MPa stirrup concrete beams of T shape section has be made to study in this paper, and analyzed that diagonal crack appear and developing under the uniform load, in this foundation, discussed the different influence factor with emphasis, namely the concrete intensity, the steel bar intensity, the rate of stirrup influence to experiment beams' dehiscence and the crack width, discussed whether experimented beams satisfy the biggest diagonal crack width limiting value request in the using load stage.At the same time, in the experimental foundation, using grey theory to analyze the influence factor of the dehiscence load and the diagonal crack width, produces the major influence factor and the important influence factor, in this to reference massive computations theory, produced the recommendation formula of diagonal crack width about high-strength stirrup concrete beams under the uniform load. Have carried on the computation using this formula and the domestic and foreign formula to various universities' experimental material, the result indicated that this formula suggested by this paper could estimate the reality diagonal crack width properly.According to experiments and the theoretical analysis, the diagonal crack development tendency of the beam with 500MPa stirrup is similar to the concrete beams used ordinary stirrup, in the using load scope which "Standard" calculates, generally may satisfy the biggest diagonal crack width limiting value request.