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为研究结构构件发生一定疲劳损伤后的疲劳剩余承载性能,对4根相同的钢筋混凝土简支梁分别进行静承载力试验和疲劳后的剩余承载性能试验。对试件在发生严重的疲劳损伤后的疲劳剩余承载性能进行研究发现,梁的失效是由受拉区钢筋断裂造成的,按适筋梁设计的试件在发生明显的疲劳损伤后呈现出类似少筋梁的破坏形式;试件疲劳后的屈服承载力小于疲劳加载上限,极限承载力大于疲劳加载上限;疲劳过程中试件刚度的变化基本遵循突然降低—平稳—降低的趋势。
In order to study the fatigue residual load carrying capacity of the structural members after a certain fatigue damage, the static load capacity test and the remaining load bearing capacity test of four identical reinforced concrete simply supported beams were carried out respectively. The fatigue residual load-carrying capacity of the specimen after serious fatigue damage was studied. The failure of the beam was caused by the rupture of the steel bar in the tension zone. The specimens designed by the proper beam showed similar fatigue damage The fatigue capacity of the specimen after fatigue is lower than the upper limit of fatigue load, and the ultimate load is greater than the upper limit of fatigue load. The variation of specimen stiffness during fatigue basically follows the trend of sudden decrease-steady-decrease.