摘要
共进行了9个、收录了6个碳纤维加固梁受弯试验,通过研究发现,加固梁在纵筋屈服前,截面应变基本符合平截面假定,屈服后,平截面假定误差较大;碳纤维加固后,梁的屈服曲率、位移有所提高,极限曲率、位移基本呈降低趋势,曲率延性系数μ、位移延性系数μΔ降低;沿梁长均匀分布U型箍对梁的延性的降低有改善作用;提出屈服曲率和极限曲率(并考虑箍筋影响)的计算公式,与试验结果作比较,验证公式的有效性。根据一定的延性要求,推算出矩形截面梁加固的最大纤维用量公式。
The test of nine beams strengthened by CFRP sheets are conducted and the author also collects the information of other six beams strengthened by CFRP sheets. Before yielding of steel bar, plane assumption is matched well with the experiment results, but after yielding of steel bar, it is not agreed with the test results well. The yield curvature and displacement of the beam strengthened by CFRP are increased, but all of the ultimate curvature, displacement, and ductility ratio of curvature coefficient μφ and displacement coefficient μΔ are decreased. The deformation ability can be improved by the U type stirrup that are even distributed along the beams. The formulas to calculate the yield and ultimate curvature of beam are worked out considering the action of the stirrup, and the accuracy of the formula was proved by experiment. The maximum CFRP amount of the beam with rectangular section were calculated according to ductility arming.
出处
《四川建筑科学研究》
北大核心
2006年第2期49-55,共7页
Sichuan Building Science
关键词
碳纤维应变
纤维拉断
混凝土压碎
曲率
位移
strain of carbon fiber reinforce plastics（CFRP）
break of CFRP
crushing of concrete
curvature
displacement
