粘贴加固混凝土梁疲劳性能研究

Fatigue behavior of the reinforced concrete beam strengthened with steel plate or CFRP

为研究粘贴加固混凝土梁疲劳性能,以评价粘贴加固技术的长期加固效果,进行了1根粘钢加固梁、1根CFRP加固混凝土梁及1根对比梁的疲劳试验和非线性有限元分析。研究表明:在钢板与混凝土粘结完好情况下,与CFRP加固相比,粘贴钢板加固较大地提高了梁的刚度;与未加固梁相比,CFRP加固混凝土梁的疲劳寿命提高了约54.8%,粘钢加固梁疲劳寿命反而降低了15.2%。本次试验中CFRP加固的长期加固效果比钢板加固好。

In order to study the fatigue behavior of the reinforced concrete beams strengthened with steel plate or CFRP,and to assess the long-term effect of the strengthening technique,two beams strengthened with steel plate or CFRP and one contrasting beam were tested under fatigue loading.The main results obtained from the tests and the finite element analyses are: in the case of bond intact,bonded steel plate can improve the beam stiffness more obviously than the CFRP reinforcement;the fatigue life increases 54.8% after being strengthened with CFRP,and decreases 15.2% after being strengthened by steel plate;the CFRP reinforcement is more effective than the steel plate strengthening in this test.