CAJ | 학술논문

对8根持载与恶劣环境作用后的碳纤维增强聚合物(CFRP)加固混凝土梁进行了试验研究.梁的尺寸为1700 mm×120 mm ×200 mm.首先采用4点分加栽方式对梁进行预裂,卸载后粘贴CFRP片材,然后放入腐蚀环境.影响因素考虑了干湿交替与持载水平(持载水平分别为30%和60%混凝土梁极限荷载).分析了干湿交替单一因素和荷载与干湿交替双重因素对CFRP加固梁的长期性能.试验结果表明:荷载与干湿交替双重因素对CFRP加固梁的承载力和破坏形态影响较大,这主要是由于CFRP与混凝土界面的劣化引起;对CFRP加固梁的刚度几乎没有影响.
대8근지재여악렬배경작용후적탄섬유증강취합물(CFRP)가고혼응토량진행료시험연구.량적척촌위1700 mm×120 mm ×200 mm.수선채용4점분가재방식대량진행예렬,사재후점첩CFRP편재,연후방입부식배경.영향인소고필료간습교체여지재수평(지재수평분별위30%화60%혼응토량겁한하재).분석료간습교체단일인소화하재여간습교체쌍중인소대CFRP가고량적장기성능.시험결과표명:하재여간습교체쌍중인소대CFRP가고량적승재력화파배형태영향교대,저주요시유우CFRP여혼응토계면적열화인기;대CFRP가고량적강도궤호몰유영향.
The test results of eight concrete beams reinforced with carbon fiber reinforced polymer (CFRP) sheets subjected to an aggressive environment under a sustained load are presented.The beams are 1 700 mm long with a rectangular cross-section of 120-mm width and 200-mm depth.The beams are precracked with a four-point flexural load, bonded CFRP sheets, and placed into wet-dry saline water(NaCl) either in an unstressed state or loaded to about 30% or 60% of the initial ultimate load.The individual and coupled effects of wet-dry saline water and sustained bending stresses on the long term behaviour of concrete beams reinforced with the CFRP are investigated.The test results show that the coupled action of wet-dry saline water and sustained bending stresses appears to significantly affect the load capacity and the failure mode of beam strengthened with CFRP, mainly due to the degradation of the bond between CFRP and concrete.However, the stiffness is not affected by the coupled action of wet-dry cycles and a sustained load.