Journal of South China University of Technology (Natural Science Edition) ›› 2011, Vol. 39 ›› Issue (4): 140-148.doi: 10.3969/j.issn.1000-565X.2011.04.025

• Electronics, Communication & Automation Technology • Previous Articles     Next Articles

Analysis of Compressive Capacity of Brick Masonry Compressively Strengthened with Sprayed GFRP

Gu Qian1  Peng Bo2  Weng Rui1   

  1. 1·School of Civil Engineerihg and Architecture,Wuhan University of Technology,Wuhml 430070,Hubei,China;2. Hubei United Development Investment Group Co.,Ltd.,Wuhan 430077,Hubei,China
  • Received:2010-08-09 Revised:2010-11-16 Online:2011-04-25 Published:2011-03-01
  • Contact: 谷倩(1972-)，女，博士，教授，主要从事结构加固理论的研究 E-mail:guqian1127@gmail.com
  • About author:谷倩(1972-)，女，博士，教授，主要从事结构加固理论的研究
  • Supported by:

    国家自然科学基金资助项目(50708084)；湖北省自然科学基金重点项目(2008CDA043)；教育部留学回国人员科研启动基金资助项目(20091j0005)

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Abstract:

In this paper,firstly,standard compressive specimens of brick masonry were strengthened with sprayed chopped glass fibre-reinforced polymer（GFRP）.Then,the specimens were tested under both the concentrically and the eccentrically axial compressions,and the failure mode,the ultimate bearing capacity and the ultimate deformability of the strengthened specimens were explored.Finally,the strengthening effects affected by the spraying thickness,the chopped fibre length and the combination with glass fibre gridding sheet were investigated.The results indicate that（1） spraying GFRP significantly increases the ultimate bearing capacity and the deformability of brick masonry in compression,effectively postpones the emergence and propagation of initial cracks,and fairly improves the brittle behaviour of unreinforced masonry;（2） the ultimate compressive capacity and the ultimate compressive strain of the strengthened specimens under concentric compression averagely increase by 79.9% and 60.3%,respectively,while those of the specimens under eccentric compression averagely increase by 136.7% and 90.8%,respectively;and（3） the optimal spraying thickness and chooped fibre length for compressively-streng-thened brick masonry are 7mm and 25mm,respectively.In addition,the calculated values of ultimate bearing capacity obtained by the proposed simplified formula accord well with the test ones.

Key words: brick masonry, compressively strengthening, spray, glass fibre reinforced polymer (GFRP), ultimate capacity, ultimate compressive strain