Experimental And Simulation Study On Welded-rebar Corbel

Corbels are widely used in hydropower house,aqueduct,embankment and some other hydraulic projects.Corbels are the important parts of hydraulic structure in our country.China's Ministry of housing has carried out a comprehensive specification for the design of the corbel.theTechnology of corbels is also improving at the same time.A large number of famous scholars in China have made a systematic study on the steel fiber Corbels,pointed out that the tensile strength and flexural strength of corbel can be increased significantly by adding steel fiber.The shock resistance,fatigue resistance and toughness are improved to a great extent.Therefore,the ductility and plasticity of the brittleness of the high strength concrete can be increased effectively by adding steel fiber,and the damage which is out of warning can be avoided.With the increasing popularity and application of high strength concrete in practical engineering,it is necessary to study the concrete corbel.In this paper,the results of the high-strenghen concrete members with different volume show that the rules of the high strenghen concrete corbel under the impacts of the different loads,diagonal and orthogonal strain on the surface of corbel,change regulation of crack and deflection,in order to further improve the research of high strenghen concrete corbel,presenting relevant theoretical and numerical results,analyzing micro-mechanism of the corbels,improving the research of high strenghen concrete corbel.Meanwhile,Deficiencies of the high-strenghen corbels could be further revised,performance of the corbels could be improved,project cost could be reduced,engineering quality would be improved,providing guidance for the application of steel fiber high strength concrete corbel in practical engineering,the reference would be provided for the design of steel fiber reinforced high strength concrete,the main results as follows:1.Firstly,this paper introduces the different design standards of different countries,extracting some problem of the difference of the results caused by different standards,combining with the practical problems in China,designing experience which is adopt to our purpose.A series of comparative studies on shear span ratio and steel fiber content are proposed.2.Under the influence of steel fiber fraction and shear span ratio,comparing the different levels of the same variable,in this experiment,the data which are needed to be recorded are as follow: The empirical formula of the strain curve,the maximum crack width at all levels,the development rule of the crack,the cracking load and the ultimate load are presented,and focusing on the different influence of shear span ratio and steel fiber volume.These results indicated that shear span ratio is the main factor which determining the ultimate capacity and the failure mode,different controlling factors showed a different impact on the form and the loads capacity.3.Comparing with the numerical formula of Ding Binyan's theory,Seeking for the derivation of the theoretical load capacity.and by comparing the characteristics of steel fiber high strengthen concrete.The original formula is optimized and improved,Deducing the formula of failure rule of high strength steel fiber corbles.