Experimental Research On Shear Resistance Of Steel Fiber Reinforced Concrete T-beams

Scholars at home and abroad have studied the concrete members with smaller cross-section height,but few of them have studied the concrete members with larger cross-section size,and less of them have studied the steel fiber reinforced concrete members.Based on the experimental study of shear behavior of six reinforced steel fiber reinforced concrete beams,the effects of section height on cracking shear force of oblique section,concrete strain in shear-compression zone,stirrup strain in bending-shear zone,width of intersection position of main oblique crack and stirrup and shear capacity of reinforced steel fiber reinforced concrete beams are analyzed.The applicability of the existing formulas to the cracking load and shear capacity of the oblique section of reinforced steel fiber reinforced concrete beams is verified by comparing the experimental results with the calculation results of the existing formnulas for the cracking load and shear capacity of the oblique section of reinforced steel fiber reinforced concrete beams.The main conclusions are as follows:(1)The failure modes of oblique section of reinforced steel fiber reinforced concrete beams are similar to those of ordinary reinforced concrete beams.When the shear span ratio is 2.5,the failure modes are shear-compression.(2)Under the same load,the stirrup strain at the intersection of the test beam with the main oblique crack increases with the increase of the section height,and the width of the main oblique crack increases with the increase of the section height.(3)The cracking load and shear capacity of the oblique section of reinforced steel fiber reinforced concrete beams are basically independent of the height of the section.Therefore,the cracking load and shear capacity of the oblique section of reinforced steel fiber reinforced concrete beams basically do not have the effect of section size.(4)The existing statistical formulas of cracking load on oblique section of reinforced steel fiber reinforced concrete beams can be applied to some of the reinforced steel fiber reinforced concrete beams in this paper,but some can not be used;the shear bearing capacity of reinforced steel fiber reinforced concrete members in the current code CECS-38-2004-Code for Structural Design and Construction of Steel Fiber Reinforced Concrete Beams and Research on the Design Method of Shear Bearing Capacity of Reinforced Steel Fiber Reinforced Concrete Beams]The load calculation formula shows that the shear bearing capacity formula is not applicable to predict the shear bearing capacity of steel fiber reinforced concrete beams in this paper.Based on the experimental data and other experimental data collected by the experimental group,a formula considering the influence of stirrup ratio,shear span ratio and other factors is established,which can predict the shear bearing capacity of steel fiber reinforced concrete beams,and has certain safety storage.Prepare.