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对配置500 MPa细晶粒(HRBF500)钢筋混凝土梁的疲劳性能的研究鲜见报道,设计、制作2根矩形和2根T形截面的HRBF500钢筋混凝土(C50)简支梁,并进行静力加载和疲劳试验。基于试验结果,分析了静载作用下不同截面形式和不同配筋率的梁受拉钢筋应变、跨中挠度以及梁裂缝发展规律,研究了钢筋应力幅值大于150 MPa时,各钢筋混凝土梁在疲劳荷载作用下的受力性能。结果表明,最大疲劳荷载和振幅是影响试验梁是否发生疲劳破坏的主要因素。
The fatigue properties of 500 MPa fine grain (HRBF500) reinforced concrete beams are rarely reported. Two rectangular and two T-shaped HRBF500 reinforced concrete (C50) simply supported beams are designed and fabricated and are statically loaded And fatigue test. Based on the test results, the law of strain, span mid-span deflection and beam crack propagation of beams under different static loads are analyzed. The results show that when the stress amplitude is greater than 150 MPa, Mechanical behavior under fatigue load. The results show that the maximum fatigue load and amplitude are the main factors that affect the fatigue failure of the test beam.