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（1 鄭州大學土木工程學院，鄭州 450002； 2 鄭州水利學校，鄭州 450003；3 國家糧食儲備局鄭州科學研究設計院，鄭州 450003）

［摘要］目前，基于災后損傷混凝土結構需要加固及損傷程度對加固后結構影響程度的研究尚屬空白，按1/3縮尺模型，設計制作了鋼筋混凝土框架試件。分別對3榀框架施加水平低周反復荷載，使其處于不同損傷狀態(tài)（截面開裂、鋼筋屈服），保持豎向荷載不變，對其進行碳纖維布加固，再對加固框架進行同樣試驗至破壞?；谠囼灲Y果，分析了損傷程度對加固框架開裂荷載、極限荷載、位移延性、裂縫寬度及碳纖維布應變滯后的影響；比較了碳纖維布加固不同損傷混凝土框架的抗震性能。結果表明，隨著損傷程度的增加，碳纖維布加固后框架的最大裂縫寬度越大、碳纖維布應變滯后也越大；當損傷程度達到嚴重時，加固后的結構延性減小?？傮w上，碳纖維布加固的不同損傷鋼筋混凝土框架均具有良好的抗震性能，為大震后損傷混凝土框架加固提供理論依據(jù)。

［關鍵詞］損傷混凝土框架；碳纖維布；加固；抗震性能；損傷程度；擬靜力試驗

中圖分類號：TU375.3文獻標識碼：A文章編號：1002-848X(2011)06-0094\|04

Damaged degree effect on seismic behavior of  RC frames strengthened by CFRP sheets

Wang Xinling¹，F(xiàn)an Jianwei²，Yao Zhangtang³，Bi Suping¹(1 College of Civil Engineering, Zhengzhou University，Zhengzhou 450002，China；2 Zhengzhou Conservancy School, Zhengzhou 450003, China；3 Zhengzhou Science Research and Design Academy, Zhengzhou 450003, China)

Abstract:Based on present situation that the damaged RC frames need be strengthened after earthquake and the study of damaged degree effect on strengthen RC frame is less, the RC frame models with the scale 1/3 were designed and produced. Low-cyclic and repeated load was imposed on the three RC frame models, so that they were in different degrees of injury. Then, they were strengthened by CFRP in conditions of vertical-load holding, Last, the same experiments of the strengthened frames were done again, until the frame was failure. Based on the test data, the effects of damaged degree on cracking load, limit load, ductility, crack width and CFRP strain delay of strengthen frames were analyzed. The seismic properties of the different damaged RC frames strengthened by CFRP were compared. The results show that the longer the damaged degree, the widther the cracks and the more the CFRP strain delay. The ductility is less when the damaged degree of strengthened structure is critical. As a whole, the different damaged RC frames strengthened by CFRP have good seismic properties and performance. The theory basis was provided for strengthened RC frame after rare earthquake.

Keywords:damaged RC frame；CFRP; strengthen；seismic performance；damaged degree； quasi\|static experiment

*河南省重點科技攻關項目（092102310036）。

作者簡介：王新玲，博士，教授，一級注冊結構工程師，Email: wxlwzn@126.com。

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