|Table of Contents|

Influence of depth of compression zone on effectiveness of strengthened bridges with carbon fiber sheets(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2011年04期
Page:
63-67
Research Field:
Publishing date:
2011-08-20

Info

Title:
Influence of depth of compression zone on effectiveness of strengthened bridges with carbon fiber sheets
Author(s):
DONG San-sheng;  LEI Zi-xue;  YAN Xing-wei
School of Civil Engineering, Chang'an University, Xi'an 710061, Shaanxi, China
Keywords:
bridge engineering;  strengthening with carbon fiber sheet;  flexural capacity;  depth of compression zone;  beam height;  reinforcement ratio
PACS:
U445.72;U441
DOI:
-
Abstract:
Theoretical analysis and finite element modeling were adopted to study the continuity of equations for the flexural capacity of structural members by bonding carbon fiber sheets and the strengthening effect of such method in specifications for strengthening design of highway bridges (Chinese Code). A family of ΔM-h and ΔM-ρ curves were obtained under different conditions. The results indicate that if x is equal to the parameter of ξfb, only when the height of a flexural member is less than 500 mm or its longitudinal reinforcement ratio is around 1.6%, the equations are continuous, otherwise jumps occur between the equations; if x is not less than the ξfbh and less than ξbh0, when the height of flexural member is less than 600 mm, the bonding carbon fiber sheets have no marked strengthening effect, whereas with the increase in the height of member and its longitudinal reinforcement ratio, the strengthening effect becomes more prominent; if x is less than ξfbh, the flexural capacity calculated with corresponding equations in the Code is even less than that of the original members without strengthening, which is clearly contrary to the fact, and to which further studies is to be conducted. 2 tabs, 12 figs, 13 refs.

References:

[1] 王文炜,赵国藩,黄承逵,等.碳纤维布加固已承受荷载的钢筋混凝土梁抗弯性能试验研究及抗弯承载力计算[J].工程力学,2004,21(4):172-178. WANG Wen-wei,ZHAO Guo-fan,HUANG Cheng-kui,et al.An experimertal study of strengthening of initially loaded reinforced concrete beams using CFRP sheets[J].Engineering Mechanics,2004,21(4):172-178.
[2]黄平明,邹兰林,王 达.碳纤维板加固RC梁试验[J].建筑科学与工程学报,2007,24(4):70-73. HUANG Ping-ming,ZOU Lan-lin,WANG Da.Experiment of RC beam strengthened with CFRP plates[J].Journal of Architecture and Civil Engineering,2007,24(4):70-73.
[3]Mohammadizadeh M R,Fadaee M J.Torsional behaviour of high-strength concrete beams strengthened using CFRP sheets:an experimental and analytical study[J].Scientia Iranica,2009,16(4A):321-330.
[4]钟 龙,郑山锁,王 斌,等.采用碳纤维布加固预应力混凝土吊车梁的设计方法[J].建筑科学与工程学报,2007,24(2):54-58. ZHONG Long,ZHENG Shan-suo,WANG Bin,et al.Design method of strengthening prestressed concrete crane girder using CFRP[J].Journal of Architecture and Civil Engineering,2007,24(2):54-58.
[5]周朝阳,黄 林,贺学军.粘贴预应力碳纤维布钢梁的放张效应[J].建筑科学与工程学报,2010,27(4):14-18. ZHOU Chao-yang,HUANG Lin,HE Xue-jun.Effect of releasing pretension for steel beams bonded with prestressed carbon fiber sheet[J].Journal of Architecture and Civil Engineering,2010,27(4):14-18.
[6]Grace N F,Singh S B,Shinouda M M,et al.Flexural response of CFRP prestressed concrete box beams for highway bridges[J].PCI Journal,2004,49(1):92-104.
[7]张伟平,王晓刚,顾祥林.碳纤维布加固锈蚀钢筋混凝土梁抗弯性能研究[J].土木工程学报,2010,43(6):34-41. ZHANG Wei-ping,WANG Xiao-gang,GU Xiang-lin.Flexural behavior of corrosion inforced concrete beams strengthened with carbon fiber composite sheets[J].China Civil Engineering Journal,2010,43(6):34-41.
[8]邓宗才.碳纤维布增强钢筋混凝土梁抗弯力学性能研究[J].中国公路学报,2001,14(2):45-51. DENG Zong-cai.Flexural strengthening of reinforced concrete beams with externally bonded composite laminates[J].China Journal of Highway and Transport,2001,14(2):45-51.
[9]Ng S C,Lee S.A study of flexural behavior of reinforced concrete beam strengthened with carbon fiber-reinforced plastic(CFRP)[J].Journal of Reinforced Plastics and Composites,2002,21(10):919-938.
[10]JTG D62—2004,公路钢筋混凝土及预应力混凝土桥涵设计规范[S].
[11]GB 50367—2006,混凝土结构设计规范[S].
[12]赵志平,常建立,杨晓光.利用ANSYS 对碳纤维布加固RC梁的非线性有限元分析[J].四川建筑科学研究,2006,32(1):79-83. ZHAO Zhi-ping,CHANG Jian-li,YANG Xiao-guang.Analyzing the anti-bending function of RC beams strengthened with bottom bonded CFRP[J].Sichuan Building Science,2006,32(1):79-83.
[13]李绍俊.基于ANSYS的碳纤维布加固的钢筋混凝土梁的有限元分析[D].阜新:辽宁工程技术大学,2005.

Memo

Memo:
-
Last Update: 2011-08-20