温度升高对碳纤维薄板增强RC梁疲劳性能的影响

摘要

The static and fatigue tests under cyclic bending loads at different ambient temperatures of 20 ℃ and 80℃ are carried out to investigate the fatigue behavior of the reinforced concrete(RC) beams strengthened with'carbon fi-ber laminates(CFLs). The failure modes of the strengthened beams include CFLs debonded near the mid-span and steel rebar yielded or broken. S-N curves of strengthened beams are developed according to the test results. The fa-tigue limit, load versus deflection curves and strain response of strengthened beams are obtained as well. The results show that the fatigue behaviors of the strengthened beams are not significantly influenced by the ambient tempera-tures (lower than 80℃) when the fatigue load levels equal 25.0 kN, 27.5 kN and 30.0 kN.%为了研究碳纤维薄板增强钢筋混凝土梁在不同温度下的疲劳性能,分别在20℃和80℃的温度条件下对26根增强梁进行了三点弯曲静载和疲劳试验.结果表明:当疲劳载荷水平为25.0 kN,27.5 kN和30.0 kN时,试件的S-N曲线、疲劳极限、破坏模式、挠度曲线和应变反映受环境温度的影响较小.