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在不同荷载条件下,对8根钢筋混凝土梁进行试验,研究短期疲劳荷载作用下的变形、应力分布以及短期疲劳荷载作用后的力学指标。试验结果和分析表明:疲劳荷载对锈蚀钢筋混凝土梁的影响较大,明显降低试验梁的极限强度和延性;碳纤维加固后的锈蚀混凝土梁的极限承载力明显提高,且在破坏时具有良好的延性,承载力极限值可以提高22%～47%。碳纤维“U”形箍对试验梁的性能影响较大,没有粘贴“U”形箍的碳纤维加固试验梁在后期加载过程中,由于混凝土保护层的突然脱落而发生破坏。采用碳纤维材料加固后的较低锈蚀率的钢筋混凝土梁在经过短期疲劳荷载后依然能够具有良好的力学性能。
Under different loading conditions, eight reinforced concrete beams were tested to study the deformation and stress distribution under short-term fatigue loading and the mechanical indexes after short-term fatigue loading. The test results and analysis show that the fatigue load has a great influence on the corroded RC beams and obviously decreases the ultimate strength and ductility of the RC beams. The ultimate bearing capacity of RC beams strengthened with carbon fibers is obviously increased and has good ductility , The bearing capacity limit can be increased by 22% ~ 47%. The carbon fiber “U” shape hoop has a great influence on the performance of the test beam, and the carbon fiber reinforced test beam without the “U” shape hoop is damaged during the later loading process due to the sudden dropping of the concrete protective layer. Reinforced concrete beams with lower corrosion rate strengthened by carbon fiber can still have good mechanical properties after short-term fatigue loading.