碳纤维加固混凝土柱在低周水平反复荷载作用下抗剪性能研究
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摘要
有些建筑结构由于设计失误、老化、材料质量缺陷、地震灾害等诸多因素的影响,其功能已不能满足安全、适用、耐久性能的要求。如何充分利用现有结构,使其发挥正常功能,达到经济节约的目的成为目前工程界研究的热点。工程实践表明,在分析研究的基础上对现有不满足功能要求的结构进行针对性加固是解决这一问题的有效途径。
目前结构的加固有许多种方法。碳纤维布包裹加固混凝土结构技术近些年在国内外迅速发展,它具有轻质高强、耐腐蚀耐疲劳、施工便捷、不增加加固构件的自重和尺寸等优点,已成为国际混凝土加固技术中的热点。本文对碳纤维布横向包裹加固混凝土柱在低周水平荷载作用下的受力性能进行试验研究。主要开展了以下几方面的工作。
1、在考虑碳纤维布的粘贴量、粘贴方式、剪跨比及轴压比等参数的影响,制作两组共12个试件。
2、对试验的过程及其破坏形式进行描述。试件的破坏形态主要有剪切破坏、弯剪破坏及弯曲破坏,对导致构件的破坏原因进行分析。
3、对试验的数据进行分析处理。绘制荷载-位移滞回曲线,骨架曲线,荷载-应变曲线。分析这些曲线在不同参数影响下的变化规律。随着碳纤维布量的增加,柱的滞回曲线面积增大,曲线由对比试件的捏拢而变得饱满。加固柱子的抗剪承载能力得到提高,柱子的延性性能得到改善。随着轴压比的增大,柱子的抗剪能力增大;随着剪跨比的增大,柱子的抗剪承载力降低。
4、分析碳纤维布横向包裹加固混凝土柱抗剪的受力机理。在确定材料本构关系模型的基础上,基于桁架模型推导加固柱抗剪承载力计算公式。与试验数据对比,公式计算结果偏于安全。
Construction function is unfit for the requirement of safety, applicability and durability because of the effect of many factors of design misplays, aging, material’s quality defeat, earthquake disaster. It has received significant attentions in civil engineering on how to widely using existing structures, performance its normal functions and attaining the economical aim. Based on the research and analysis, strengthening the defeat structure is one effective method for the question.
Now, there are many strengthening methods for structure. In recent years, the technology of CFRP confining concrete structure has rapidly developed in international and domestic engineering. It has received extensively attention in civil engineering due to their unique properties, such as high strength-to- weight ratio, good resistance to corrosion and fatigue, convenient to construction, no additional weight and dimension. In this paper, experimental study has been done on confining concrete column’s properties with CFRP under low cyclic loads. The following works have been done:
1 Twelve specimens have been made, which considered the parameters influence of the amount of the CFRP, stickup fashion, span ratio and force-axis ratio.
2 The failure fashions and experimental performance have been described. The failure fashions have three patterns: sheer destroy, sheer - flexural destroy and flexural destroy. The destroy reasons have been considered in the paper.
3 Based on the experimental date analysis, hysteretic curves of load-displacement, skeleton curve and load-stress curves have been given to investigate the transformation rules of those curves under the influence of different parameters. With the adding of CFRP amount, the area of hysteretic curves becomes bigger and chubbier and there is a remarkable improvement in sheer capability and ductility of the concrete column confined with CFRP. With the force-axis ratio adding, the sheer capability of the confined columns has an improvement. But the sheer capability of the confined columns becomes lower with the decreasing.
The mechanism of the concrete column confined with CFRP has been studied in this paper. According the material relationship of strain-stress, a reasonable shear capability design formula is presented based on the typical truss mode. Compared with the experimental dates, the calculating results are safety, and can be referenced in engineering practice.
目前结构的加固有许多种方法。碳纤维布包裹加固混凝土结构技术近些年在国内外迅速发展,它具有轻质高强、耐腐蚀耐疲劳、施工便捷、不增加加固构件的自重和尺寸等优点,已成为国际混凝土加固技术中的热点。本文对碳纤维布横向包裹加固混凝土柱在低周水平荷载作用下的受力性能进行试验研究。主要开展了以下几方面的工作。
1、在考虑碳纤维布的粘贴量、粘贴方式、剪跨比及轴压比等参数的影响,制作两组共12个试件。
2、对试验的过程及其破坏形式进行描述。试件的破坏形态主要有剪切破坏、弯剪破坏及弯曲破坏,对导致构件的破坏原因进行分析。
3、对试验的数据进行分析处理。绘制荷载-位移滞回曲线,骨架曲线,荷载-应变曲线。分析这些曲线在不同参数影响下的变化规律。随着碳纤维布量的增加,柱的滞回曲线面积增大,曲线由对比试件的捏拢而变得饱满。加固柱子的抗剪承载能力得到提高,柱子的延性性能得到改善。随着轴压比的增大,柱子的抗剪能力增大;随着剪跨比的增大,柱子的抗剪承载力降低。
4、分析碳纤维布横向包裹加固混凝土柱抗剪的受力机理。在确定材料本构关系模型的基础上,基于桁架模型推导加固柱抗剪承载力计算公式。与试验数据对比,公式计算结果偏于安全。
Construction function is unfit for the requirement of safety, applicability and durability because of the effect of many factors of design misplays, aging, material’s quality defeat, earthquake disaster. It has received significant attentions in civil engineering on how to widely using existing structures, performance its normal functions and attaining the economical aim. Based on the research and analysis, strengthening the defeat structure is one effective method for the question.
Now, there are many strengthening methods for structure. In recent years, the technology of CFRP confining concrete structure has rapidly developed in international and domestic engineering. It has received extensively attention in civil engineering due to their unique properties, such as high strength-to- weight ratio, good resistance to corrosion and fatigue, convenient to construction, no additional weight and dimension. In this paper, experimental study has been done on confining concrete column’s properties with CFRP under low cyclic loads. The following works have been done:
1 Twelve specimens have been made, which considered the parameters influence of the amount of the CFRP, stickup fashion, span ratio and force-axis ratio.
2 The failure fashions and experimental performance have been described. The failure fashions have three patterns: sheer destroy, sheer - flexural destroy and flexural destroy. The destroy reasons have been considered in the paper.
3 Based on the experimental date analysis, hysteretic curves of load-displacement, skeleton curve and load-stress curves have been given to investigate the transformation rules of those curves under the influence of different parameters. With the adding of CFRP amount, the area of hysteretic curves becomes bigger and chubbier and there is a remarkable improvement in sheer capability and ductility of the concrete column confined with CFRP. With the force-axis ratio adding, the sheer capability of the confined columns has an improvement. But the sheer capability of the confined columns becomes lower with the decreasing.
The mechanism of the concrete column confined with CFRP has been studied in this paper. According the material relationship of strain-stress, a reasonable shear capability design formula is presented based on the typical truss mode. Compared with the experimental dates, the calculating results are safety, and can be referenced in engineering practice.
引文
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[3] 卫龙武,吕志涛,郭彤.建筑物评估、加固与改造[M].第二版.南京:江苏科学技术出版社,2006
[4] 姚继涛,马永欣,董振平等.建筑物可靠性鉴定和加固基本原理和方法[M].北京:科学出版社,2003
[5] 赵彤,谢剑.碳纤维布补强加固混凝土结构新技术[M].天津:天津大学出版社,2001
[6] 李俊青.碳纤维加固钢筋混凝土双向板试验研究[D].呼和浩特市:内蒙古工业大学硕士论文,2006,6～7
[7] FORCA 碳素纤维补强工法技术资料[R].日本东燃株式会社,1997
[8] 顾里之.纤维增强复合材料[M].北京:机械工业出版社,1988
[9] 中国工程建设标准化协会标准.碳纤维片材加固混凝土结构技术规程[S].北京:中国计划出版社,2003
[10] 丁洪涛.粘贴碳纤维布钢筋混凝土偏心受压柱试验与研究[D].长沙:湖南大学硕士论文,2003:7
[11] 闫长旺.碳纤维布加固预应力混凝土空心板试验研究[D].呼和浩特:内蒙古工业大学硕士论文,2006:52
[12] 郭永昌,谢志红.碳纤维布长度对 RC 加固梁的抗弯性能的影响研究[J]:广东工业大学学报.2005,2:90～95
[13] 陆定安,郭永昌,李丽娟等.碳纤维布加固 RC 剥离破坏试验研究[J]:建筑技术开发.2004,11:48～53
[14] 孔琴,刘立新.碳纤维布加固钢筋混凝土梁受弯性能的试验研究[J].郑州大学学报.2004,4:22～27
[15] 陈小兵,颜子涵,岳清瑞等.碳纤维材料加固钢筋混凝土梁的试验研究[J]:工业建筑.1998,11:5～10
[16] Francesco Bencardino,Giuseppe Spadea,R. Narayan Swamy. Strength and Ductility of Reinforced Concrete beams Externally Reinforced with Carbon Fiber Fabric[J].ACI Structural Journal.2002,99(2):163～171
[17] 黄慧明.碳纤维布加固钢筋混凝土梁的试验研究[D].长沙:湖南大学硕士论文,2000:62～63
[18] 崔倩.碳纤维布加固钢筋混凝土梁的抗剪全过程的试验研究[D].呼和浩特:内蒙古工业大学硕士论文,2005:54
[19] R.N.Swamy , P.Mukhopadhyaya, C.J.Lynsdale. Strengthening for shear of RC beam by external plate of bonding[J]. The Structural Engineer.1999,77(22):19～30
[20] Omar Chaallal, Mohsen Shahawy, Munzer Hassan. Performance of Reinforced Concrete T-Girders Strengthened in Shear with Carbon Fiber-Reinforced Polymer Fabric[J]. ACI Structural Journal. 2002,99(3):335～343
[21] Alex LI, Jules Assih, Yves Delmas. Shear strengthening of RC Beams with Externally Bonded CFRP sheets. Journal of Structural Engineering[J].2001,127(4):374～380
[22] 韩克双.碳纤维布加固高强混凝土柱的受力性能试验研究[D].大连:大连理工大学硕士论文,2005:10～11
[23] Omar Challa,Mohen Shahang. Performance of Fiber-Reinforced Polymer-Wrapped Reinforced Column under Combined Axial-Flexural Loading[J]. ACI Structural Journal. 2000,5:659～668
[24] J.G.Teng.,L.Lam. Compressive Behavior of Carbon Fiber Reinforced Polymer-Confined concrete in Elliptical Columns[J]. Journal of Structural Engineering.2002,128(12):1535～1543
[25] 赵树红,李全旺,叶列平. 碳纤维布加固钢筋混凝土柱受剪性能试验研究[J]:工业建筑.2000,(2):12-15
[26] 王铁成,韩洪胜,王立军,白润山.碳纤维布增强钢筋混凝土柱受剪承载力的试验研究[J]:河北建筑工程学院学报.2002,(1):19-22
[27] 许成详,李忠献,蔡卫东.碳纤维布加固钢筋混凝土短柱的受剪承载力的计算[J]:江汉石油学院学报.2002,(1):88-91
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