To investigate the relationship of strain between the high strain-hardening UHPC and the reinforcement when the flexural failure of beams occurred

one-third loading experiments were carried out on five girder specimens. During the tests

the change parameters of the specimens are the reinforcement percentage and the type of reinforcement. Firstly

the load-deflection curves of reinforcement and high strain strengthening UHPC indicate that T-beam failure process could be divided into three stages: the elastic stage

the fracture development stage and the load-to-failure stage. Secondly

the cooperation between reinforcement and UHPC was discussed based on the load-strain curves of reinforcement and high strain-strengthening UHPC. Finally

the loading process was divided into four stages according to the stress-strain curves of reinforcement and high strain-strengthening UHPC. The results show that the reinforcement rebar and the UHPC present reliable cohesiveness and could keep the strain consistent before the reinforcement reaches the yield strain. The resistance of high strain-hardening UHPC tensile strength plays more important proportion than reinforcement rebar during the flexural process

and it could be bigger at a low percentage of reinforcement. It is suggested that the tensile strength of UHPC should be taken into account when calculating the bearing capacity of high strain-hardening UHPC

and ensure the accuracy of the calculation method of bearing capacity.