在役混凝土梁碳纤维加固试验研究

将两根钢筋混凝土梁加载至产生一定裂缝,以模拟在役钢筋混凝土梁的损伤状态。在此基础上,对其中一根梁进行加固处理,加固方案采用的是梁底和梁侧粘贴碳纤维布的方法。然后通过梁的受弯破坏试验,研究了钢筋混凝土梁在采用碳纤维材料加固后,混凝土、钢筋及碳纤维布的应变变化和梁的裂缝、挠度发展情况,综合评价了碳纤维加固方法的效果。同时,通过记录验梁在试验过程中的各种材料应变,绘制了各应变随荷载的变化关系,分析钢筋应变与碳纤维应变变化协同关系,并基于此验证了平截面假定是否成立。最后,按照各规范所提供的设计公式,将规范方法计算值与试验结果进行对比分析,指出加固规范中存在的问题,并分析了原因。

Experiment research on concrete beams in service reinforced by carbon fiber sheet

To imitate the damage condition of concrete beams in service,two beams were loaded to crack occurring.Based on the foregoing work,one of the beams was reinforced by the carbon fiber sheet stuck under the beam.Soon afterwards the bending tests were conducted,and the strains of concrete,rebar and carbon fiber were studied,as well as the crack and deformation of beams.Using the test data,the strengthening effects were assessed comprehensively.At the same time,the numerical relationship of strain of different m...