CFRP加固钢筋混凝土梁疲劳刚度的试验研究

Experimental Research on the Fatigue Rigidity of RC Beams Reinforced by CFRP Sheets

研究目的:碳纤维布加固混凝土结构是一种新型结构加固方法。粘贴碳纤维布是提高混凝土梁疲劳性能的有效方法,可用于延长损伤混凝土结构的使用寿命。研究结果:CFRP加固混凝土梁在疲劳荷载作用下,正截面平均应变仍符合平截面假定。加固梁在疲劳荷载作用下刚度降低,裂缝宽度增大。得到了CFRP加固钢筋混凝土梁在疲劳荷载作用下的疲劳刚度计算方法和计算公式,计算结果与试验结果符合良好。

Research purposes： Concrete structure reinforced with carbon fiber plastic sheet （CFS） is a new retrofit method in the field of civil engineering. The CFRP - sheet is effective for the improvement of fatigue performance of RC beams, which can prolong the service life of damaged concrete structure. Research results ： Concrete beamg stress - strain under fatigue loading should fit to the assumption of that on the plane and section. Specimens＇fatigue flexural rigidity reduces gradually, resulting in enlarging the cracks. The discussion is also made on the calculation methods and formulas for the rigidity of highly strengthened concrete beams under fatigue load and the calculation results conform to the experimental results.