The Study Of The Mechanical Property Of HRB400 Reinforced Concrete Members

In this article, the mechanical of the HRB400 Reinforced Concrete Members under flexure, shear and plastic internal force redistribution is studied. HRB400 steel bars, the 400 MPa hot rolled steel bar, which is called new grade III steel bar, has been taken as the one of 10 new technical spreading the application mainly, listed in revised newly code, so spread application as leading steel bar in reinforced concrete structure. In 1998,it's pointed new grade III steel bar is a new type building steel used specially in building structure. In the new Code for design of concrete structures (GB50010-2002) ,it's also pointed out definitely. HRB400 steel bars is characterized by high parity between strength and price,good ductility and welding quality. It must be used widely in building project. The study can provided theoretic and testing bases for the application of HRB400 steel bars, accelerate its spreading application.According to test of 4 beams reinforced with HRB400 steel bars, the question are analyzed on the flexural strength of members with different ratio, and on the crack and deflection under the state of serviceability. The testing results indicate that the HRB400 reinforced concrete members worked well and have obvious failure marks. The calculated strength of the member is conservative. The formula in Code for design of concrete structures (GB50010-2002) can used to estimate the width of crack. The deflection formula is calibrated and the calculation results using the calibrated formula show a good agreement with the testing results.According to the test of the shear beams reinforced with the stirrup of HRB400 steel bars, the mechanical property of stirrup in the members is studied. The testing results indicate that this kind of members can worked well and resist the shear as the members reinforced with the common stirrup. The calculation results using the formula in Code for design of concrete structures (GB50010-2002) can fulfill requires of design.The state of destruction and characteristics of deformation of the testing member are observed, the testing results are analyzed and the characteristics of the plastic internal forceredistribution are studied in this type of structure according to the test of the HRB400 continuous reinforced beam. The testing results indicate that the HRB400 continuous reinforced beam not only can achieve plastic internal force redistribution thoroughly and also has enough capability in the amplitude adjustment and can achieve the quotient designed.