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(1 孝感學(xué)院，孝感 432100； 2 武漢大學(xué)，武漢 430072)

［摘要］采用碳纖維布加固框架節(jié)點(diǎn)梁端的加固方式，研究了6個(gè)加固節(jié)點(diǎn)在低周反復(fù)荷載作用下的抗震性能。低周反復(fù)荷載作用下，著重考慮了混凝土強(qiáng)度和錨固方式對(duì)加固效果的影響。加固后試件的開裂荷載、屈服荷載和破壞荷載均有所提高，梁上的封閉碳纖維布箍對(duì)混凝土起到良好的約束作用，在一定程度上提高了試件的承載力，延緩了裂縫的產(chǎn)生和發(fā)展。試驗(yàn)從滯回曲線、剛度退化、能量耗散、延性、主筋應(yīng)變及節(jié)點(diǎn)核心區(qū)剪切變形等方面進(jìn)行了研究。加固后節(jié)點(diǎn)的滯回環(huán)趨于飽滿，剛度退化減小，耗能能力和延性系數(shù)均有不同程度的提高，梁柱中主筋應(yīng)變由于碳纖維布的作用而得到控制。

［關(guān)鍵詞］加固；框架節(jié)點(diǎn)；試驗(yàn)；抗震性能

Experimental study on the beam-column joint strengthened with CFRP under low-cycle reversed load

Liu Jinjun¹, Wang Tianwen²(1 Xiaogan University, Xiaogan 432100, China; 2 Wuhan University, Wuhan 430072, China)

Abstract:The experiment of 6 beam-column joints strengthened with CFRP under low-cycle reversed load is performed. Two influencing factors: concrete intensity and anchor methods under low-cycle reversed load are considered. The cracking load, bending load and destructive load are improved. The close CFRP hoop on the beam can restrict concrete, so as to enhance its bearing capacity and relay the occurrence and development of the cracks. The hysteresis loop, stiffness digration, energy dissipation, ductility, reinforcement strain and shearing deformation of core of beam-column joints are studied. The aseismic behavior of reinforced members have been improved. Because of CFRP, reinforcement strain can be controlled.

Keywords:reinforcement; beam-column joint; experiment; aseismic behaviour

作者簡(jiǎn)介：劉進(jìn)軍，碩士，講師，Email：hbxgljj@126.com。

參考文獻(xiàn)

［1］朱錦章，王天穩(wěn).碳纖維布加固框架梁端部錨固方式試驗(yàn)研究［J］.武漢理工大學(xué)學(xué)報(bào), 2006，28(1):67-69.

［2］趙彤，謝劍.碳纖維布補(bǔ)強(qiáng)加固混凝土結(jié)構(gòu)新技術(shù)［M］.天津：天津大學(xué)出版社，2001.

［3］葉列平. 碳纖維布在混凝土梁受彎加固中抗剝離性能的試驗(yàn)研究［J］.建筑結(jié)構(gòu)，2003，33(2)：61-65.