持载下预应力CFRP加固R．C梁受弯承载力计算及其影响因素分析

熊学玉; 范新海

doi:10.13204/j.gyjz201004026

持载下预应力CFRP加固R．C梁受弯承载力计算及其影响因素分析

doi: 10.13204/j.gyjz201004026

熊学玉^1,2,
范新海¹

1.
1. 同济大学建筑工程系,上海 200092;
2.
2. 先进土木工程材料教育部重点实验室同济大学,上海 200092

基金项目:

上海市建设技术发展基金资助项目(B05043);上海市科委科技支撑计划(09231201102);工程建设行业标准《预应力混凝土结构设计规范》研究项目;上海市科委《现代预应力成套技术》(0907H194200)

详细信息

作者简介:
熊学玉，男，1962年出生，教授，博士生导师。E－mail:xiong_xueyu@tjpec.com

中图分类号: TU375.1
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- 文章访问数: 91
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- PDF下载量: 100
- 被引次数: 0
出版历程
- 收稿日期: 2009-06-26
- 刊出日期: 2010-04-20

CALCULATION OF THE FLEXURAL CAPACITY OF R．C BEAMS STRENGTHENED WITH PRESTRESSED CFRP UNDER SUSTAINING LOAD AND ANALYSIS OF THE INFLUENTIAL FACTORS

Xiong Xueyu^1,2,
Fan Xinhai¹

1.
1. Department of Building Engineering,Tongji University,Shanghai 200092,China;
2.
2. Key Laboratory of Advanced Civil Engineering Materials(Tongji University),Ministry of Education,Shanghai 200092,China

摘要

摘要: 粘贴预应力碳纤维布加固混凝土构件是一种行之有效的加固方式，通过对持载下预应力碳纤维布加固钢筋混凝土梁受弯破坏理论分析和总结，推导出承载力计算公式，并通过理论计算分析了持载及预应力水平对承载力的影响。分析结果表明：当受压区混凝土压碎时，梁的极限承载力随着持载的增大而逐渐降低，随着预应力水平增大而逐渐增大且具有极值；当碳纤维布拉断时，梁的承载力随着持载的增大而逐渐增大，而随着预应力水平的增大逐渐降低。持载对极限承载力的影响较小，可以忽略；最后基于加固后构件的延性探讨了预应力CFRP有效张拉应变的控制值。
- 预应力碳纤维布 /
- 加固 /
- 钢筋混凝土梁 /
- 抗弯承载力 /
- 持载
Abstract: The concrete members strengthened with prestressed CFRP is an effective method. Through the theoretical analysis and summary of flexural failure of reinforce concrete beams strengthened with prestressed CFRP under sustaining load,the simplified calculation formulas of load carrying capacity are presented?and the influence of the sustaining loads and pre-stressed levels on ultimate load-carrying capacity are analyzed. The theoretical analysis results indicated that when the concrete in the compression zone is crushed,ultimate load-carrying capacity is decreasing with sustaining loads increasing,whereas ultimate load-carrying capacity is increasing with prestressed levels increasing and has extreme value. When CFRP sheet is ruptured,the change of ultimate?load-carrying capacity was completely contrary to that of the crushe concrete in compression zone. The effect of sustaining loads on ultimate load-carrying capacity isn't obvious and can be ignored. Finally control value on tensile strain of the CFRP is also given based on the ductility failure of the strengthened members.
- prestressed CFRP sheet /
- strengthen /
- reinforce concrete beams /
- flexural capacity /
- sustaining load

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参考文献(14)

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