EXPERIMENTAL RESEARCH ON HRBF500 HIGH STRENGTH RC BEAMS FOR HIGH SPEED RAILWAY UNDER FATIGUE LOADING

The study on fatigue properties of HRBF500 high strength reinforced concrete structures is rarely reported.The two rectangle and two T-section HRBF500 R C beams are designed and produced.And the static loading and fatigue experiments are conducted on these specimens.Based on the experimental results,the tensile strain of the steel,midspan deflection and the cracks developing law are analyzed under the static loading on the specimen with different cross-section and steel ratio.The mechanical properties of the beams are evaluated when the steel stress is over 150 MPa under fatigue experiment.The test result shows that the maximum fatigue load and amplitude are the main factors to decide if fatigue failure would occur on the beam.