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周洋（中國航天建設(shè)集團(tuán)有限公司， 北京 100071）

 

［摘要］對(duì)4根CFRP同時(shí)加固正、負(fù)彎矩區(qū)的T形截面兩跨連續(xù)梁進(jìn)行了試驗(yàn)，對(duì)CFRP加固連續(xù)梁的承載能力、裂縫開展、變形及碳纖維和鋼筋的應(yīng)力、應(yīng)變情況進(jìn)行了研究。結(jié)果表明：通過CFRP加固，連續(xù)梁的極限彎矩和屈服彎矩均得到較大提高；增強(qiáng)了連續(xù)梁的抗彎剛度，連續(xù)梁撓度至少減小60%；延緩了裂縫的出現(xiàn)，有效地減小了裂縫寬度、間距；U形箍可以保護(hù)底部CFRP，并提高CFRP的使用效率。驗(yàn)算了CFRP加固受彎構(gòu)件的抗彎承載力計(jì)算公式并對(duì)其提出修改建議；對(duì)CFRP加固的連續(xù)梁進(jìn)行了延性分析；分析了CFRP加固連續(xù)梁后的內(nèi)力重分布情況并提出彎矩調(diào)幅系數(shù)。

［關(guān)鍵詞］碳纖維布；T形截面；RC連續(xù)梁；受彎承載力；加固

中圖分類號(hào)：TU375.1      文獻(xiàn)標(biāo)識(shí)碼：A      文章編號(hào)：1002-848X(2013)10-0076-08

 

Experimental and theoretic study of RC continuous beam with T-section strengthened by CFRP

Zhou Yang

(China Aerospace Construction Group Limited Company, Beijing 100071, China)

 

Abstract: Flexural loading tests were carried out on 4 RC continuous beams with T-section strengthened by CFRP in both positive moment and negative moment areas. The flexural capacity, cracks, strain and deformation of the beams were discussed. The results show that the ultimate moment and yield moment of the beam are increased sharply; the flexural stiffness is increased and the deflection is reduced by at least 60%; the width and the distance of cracks are reduced; the U-shaped hoop can protect the CFRP from stripping and raise its efficiency. The calculation formula of flexural capacity of continuous beams strengthened with CFRP is verified and modified with suggestions. The ductility of continuous beams strengthened with CFRP is studied. The redistribution of internal forces of strengthened beams is analyzed and the modified moment factor is proposed.

Keywords: carbon fiber reinforced polymer (CFRP); T-section; reinforced concrete continuous beam; flexural capacity; strengthening

作者簡介：周洋，碩士，助理工程師，Email:zhouyang_tj@163.com。

 

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