预应力CFRP片材体外快速加固混凝土梁试验研究与分析
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摘要
碳纤维布(CFRP)加固具有施工方便、周期短、不增加结构自重等优点,近年来应用日趋广泛。但在构件上直接粘贴碳纤维布时,碳纤维布和混凝土界面易发生剥离破坏,同时碳纤维布存在应变滞后,强度不能得到充分发挥,而且不能改善结构的正常使用性能。因此,预应力CFRP加固技术具有重要的应用价值。本文研究的试验基础:本研究小组的波形齿夹具锚锚固CFRP片材的试验研究;波形齿夹具锚横向张拉CFRP片材的试验及施工工艺研究;预应力CFRP片材损失的试验研究。
本文通过3根T形梁的足尺试验,在综合考虑碳纤维加固量、预应力度等因素的基础上,研究了预应力CFRP片材体外加固混凝土受弯构件的力学性能,包括承载力、破坏形态、荷载-挠度曲线和弯曲曲率关系、波形齿夹具锚张拉碳纤维片材的方法和性能研究。试验研究结果表明:采用预应力CFRP片材体外加固混凝土梁,CFRP片材的强度可以得到充分的发挥;与普通CFRP布加固相比,可以延缓开裂、减小挠度和裂缝宽度,提高开裂荷载、屈服荷载、极限荷载,可以满足正常使用极限状态的要求;波形齿夹具锚可以可靠地张拉和锚固CFRP片材。
在试验研究的基础上,本文借鉴体外预应力混凝土的计算理论,分析了体外预应力CFRP加固混凝土试验梁的极限受弯承载力。分析结果表明,本试验的预应力CFRP片材体外加固混凝土的试验梁,可以采用体外预应力理论进行分析。
CFRP strengthens construction, which used abroadly in recent years with the advantage of constructing conveniently, cycle short, not increasing dead load. However, bonding failure premature will occur between CFRP and member if the CFRP is plastered straightly. At the same time, the CFRP’s intensity will not exert sufficiently and do not improve the normal serviceability of structure. Hence, the strengthening’s technique of CFRP prestressed has very important value. The base of the research of this paper include: the test research of CFRP sheet anchored by WSGG( wave-shaped-gear-grip ) of this team of research; the test research and the technique of construction of CFRP sheet prestressed transversly by WSGG; the test research of the prestressing loss of CFRP sheet.
This article, considering parameter about the quality of CFRP sheets, the pre-stressed in CFRP sheets by three T-beam in the test of full size, research the performance of mechanics of the reinforce concrete in flexture strengthened by prestressing CFRP which includes about ultimate load, the failure mode, the curve ofload in deflection, the curve mement in curvation, the method and performance of the CFRP sheet prestressed by WSGG. The test results show in following: The intensity of CFRP sheets prestressed by WSGG will exert in completly; Comparing with the normal CFRP strengthening, reinforcement by pre-stress CFRP can retard the cracking, reduce the deflection and the crack width, increase the load in crack, the yield strength and the ultimate load and satisfy the request of the ultimate states of normal serviceability; The WSGG can reliably prestress and anchor the CFRP sheet.
Basing on the research of the test, this article uses the theory of the prestress-concrete out of the body of the structure or member for reference and analyses the ultimate flexural capacity of RC beams strengthened with CFRP prestressed by WSGG out of the beam. The result of analyse show that the test beam strengthened by pre-stress CFPR can use the theory of the out-body prestress for analyse.
本文通过3根T形梁的足尺试验,在综合考虑碳纤维加固量、预应力度等因素的基础上,研究了预应力CFRP片材体外加固混凝土受弯构件的力学性能,包括承载力、破坏形态、荷载-挠度曲线和弯曲曲率关系、波形齿夹具锚张拉碳纤维片材的方法和性能研究。试验研究结果表明:采用预应力CFRP片材体外加固混凝土梁,CFRP片材的强度可以得到充分的发挥;与普通CFRP布加固相比,可以延缓开裂、减小挠度和裂缝宽度,提高开裂荷载、屈服荷载、极限荷载,可以满足正常使用极限状态的要求;波形齿夹具锚可以可靠地张拉和锚固CFRP片材。
在试验研究的基础上,本文借鉴体外预应力混凝土的计算理论,分析了体外预应力CFRP加固混凝土试验梁的极限受弯承载力。分析结果表明,本试验的预应力CFRP片材体外加固混凝土的试验梁,可以采用体外预应力理论进行分析。
CFRP strengthens construction, which used abroadly in recent years with the advantage of constructing conveniently, cycle short, not increasing dead load. However, bonding failure premature will occur between CFRP and member if the CFRP is plastered straightly. At the same time, the CFRP’s intensity will not exert sufficiently and do not improve the normal serviceability of structure. Hence, the strengthening’s technique of CFRP prestressed has very important value. The base of the research of this paper include: the test research of CFRP sheet anchored by WSGG( wave-shaped-gear-grip ) of this team of research; the test research and the technique of construction of CFRP sheet prestressed transversly by WSGG; the test research of the prestressing loss of CFRP sheet.
This article, considering parameter about the quality of CFRP sheets, the pre-stressed in CFRP sheets by three T-beam in the test of full size, research the performance of mechanics of the reinforce concrete in flexture strengthened by prestressing CFRP which includes about ultimate load, the failure mode, the curve ofload in deflection, the curve mement in curvation, the method and performance of the CFRP sheet prestressed by WSGG. The test results show in following: The intensity of CFRP sheets prestressed by WSGG will exert in completly; Comparing with the normal CFRP strengthening, reinforcement by pre-stress CFRP can retard the cracking, reduce the deflection and the crack width, increase the load in crack, the yield strength and the ultimate load and satisfy the request of the ultimate states of normal serviceability; The WSGG can reliably prestress and anchor the CFRP sheet.
Basing on the research of the test, this article uses the theory of the prestress-concrete out of the body of the structure or member for reference and analyses the ultimate flexural capacity of RC beams strengthened with CFRP prestressed by WSGG out of the beam. The result of analyse show that the test beam strengthened by pre-stress CFPR can use the theory of the out-body prestress for analyse.
引文
[1]腾锦光等.FRP加固混凝土结构[M].中国建筑工业出版社,2005.
[2]庄江波.预应力CFRP布加固钢筋混凝土梁的试验研究与分析[D].清华大学硕士论文.2005.
[3] Ehsani , M.R. , Saadatmanesh , H . Fiber composite plate for strengthening bridge beams[J].International Journal of composite structures, 1990,15(4):343-355.
[4]赵启林,王景全,金广谦.孙宝俊碳纤维加固的"反拱预应力技术"及其提高钢结构承载能力的分析[J].钢结构,2002年03期.
[5] Triantafillou T C,Deskovic N,Deuring M,Strengthening of concrete structures with prestressed fiber reinforced plastic sheets [J]. ACI Structural Journal,1992,89(3):235-244.
[6]飞渭,江世永,彭飞飞等.预应力碳纤维布加固混凝土受弯构件试验研究[J].四川建筑科学研究[J].2003,29(2):56-60.
[7]张坦贤,吕西林,肖丹,石家峰.预应力碳纤维布加固一次、二次受力梁抗弯试验全过程理论分析[J].结构工程师.2005,21(2):43-49.
[8]叶列平,庄江波,曾攀等.预应力碳纤维布加固钢筋混凝土T形梁的试验研究[J].工业建筑.2005,35,(8):7-12.
[9]沙乌列提,叶列平.预应力CFRP布加固钢筋混凝土梁的施工技术[J].施工技术.2004,33(6):23-24.
[10] M.Basle and R.Clenin.bridge strengthening with prestressed CFRP plate systems[C]. Advanced Composite Materials in Bridges and Structures Materiaux Composites D’Avant-garde Pour Ponts et Charpentes Calgary,Alberta,July 20-23,2004:1-8.
[11] H.N.Garden and L.C.Hollaway.An experimental study of the failure modes of reinforced concrete beams strengthened with prestressed carbon composite plates[J].Composites Part B,29B,1998:411-424.
[12]梅力彪、张俊平.预应力碳纤维板加固混凝土梁的粘结锚固性能试验研究[J].工业建筑.2006,36(4):15-18.
[13]卓静,李唐宁,章庆学,周密.波形齿夹具锚与碳纤维布U形箍锚固作用的对比试验[J].建筑结构.2006,36(3):22-24.
[14]卓静,李唐宁,章庆学,周密.锚固多层碳纤维布加固钢筋混凝土梁的试验研究[J].建筑结构.2006,36(3):25-27.
[15]李庆伟、杨勇新、岳清瑞等.预应力碳纤维布加固混凝土梁锚固方式试验研究[J].工业建筑.2006,36(4):5-8.
[16]杨勇新,李庆伟,岳清瑞.预应力碳纤维布加固混凝土梁预应力损失试验研究[J].工业建筑.2006,36(4):5-8.
[17]卓静,李唐宁.FRP片材波形齿夹具锚的原理[J].土木工程学报,2005,vol38(10).
[18]刘磊.波形锚具设计试验研究[D].重庆:重庆大学土木工程学院,2007.
[19]张龙生,李唐宁,陈小英.波形齿夹具锚横向张拉CFRP片材的试验研究[J].工业建筑.2007年11月:74-77.
[20]卓静,李唐宁.波形齿夹锚在碳纤维片材加固技术及预应力技术中应用研究[J].公路交通技术增刊.2005年7月:100-104.
[21]卓静,李唐宁,章庆学,周密.锚固多层碳纤维布加固钢筋混凝土梁的试验研究[J].建筑结构.2006,36(3):25-27.
[22]卓静,李唐宁,邢世建,周密.一种锚固FRP片材的体外预应力新方法[J].土木工程学报.2007,40(1):15-20.
[23]卓静,李唐宁,章庆学,周密.波形齿夹具锚锚固碳纤维布加固混凝土梁试验研究[J].建筑结构. 2005,35(7):63-66.
[24]牛斌.体外预应力混凝土梁极限状态分析[J].土木工程学报.2000,6.
[25] Deuring . M . Post-strenthenning of concrete structrues with pretebsioned Advanced Composites[R].EMPA Report NO.224,CH-8600 Duebendorf,1993.
[26]东南大学,天津大学,同济大学,清华大学.混凝土结构[M].北京:中国建筑工业出版社,2001.
[27]王兴国.预应力纤维片材加固混凝土梁抗弯性能研究[D].中南大学,2007.
[28] Reda et al.Advanced Composite Materials for Post-Tensioning Applications:Merits,Shortcomings and Possibilities[J] . Proceedings of the International Conference on Engineering Materials,1997,l1(21).
[29] Meier. Extending the Life of Cables by the Use of Carbon Fibres[J].IABSE Symposium,1995,9:1235-1240.
[30] Meier.U.Strengthening of structures with CFRP laminates:research and applications in Switzerland[J] . In Advanced Composite Materials in Bridges and Structures.Ed.K.W.Neale and P.LabossiereL:243-251.
[31] Hollaway.L.C.Use of advanced composites in highway structures[J]. Report written for the SERCDTp/LINK Project,1993,2.
[32] Karam.G..N.Optimal design for prestressing with FRP sheets in structural members[J]. In Advanced Composite Materials in Bridges and Structures,ed. K.W.Neale and P.Labossiere:277-285.
[33] Triantallou.T.C.Innovative prestressing with FRP sheets: mechanics of short-term behaviour. [J].Eng.Mech.1991, 117(7):1652-1672.
[2]庄江波.预应力CFRP布加固钢筋混凝土梁的试验研究与分析[D].清华大学硕士论文.2005.
[3] Ehsani , M.R. , Saadatmanesh , H . Fiber composite plate for strengthening bridge beams[J].International Journal of composite structures, 1990,15(4):343-355.
[4]赵启林,王景全,金广谦.孙宝俊碳纤维加固的"反拱预应力技术"及其提高钢结构承载能力的分析[J].钢结构,2002年03期.
[5] Triantafillou T C,Deskovic N,Deuring M,Strengthening of concrete structures with prestressed fiber reinforced plastic sheets [J]. ACI Structural Journal,1992,89(3):235-244.
[6]飞渭,江世永,彭飞飞等.预应力碳纤维布加固混凝土受弯构件试验研究[J].四川建筑科学研究[J].2003,29(2):56-60.
[7]张坦贤,吕西林,肖丹,石家峰.预应力碳纤维布加固一次、二次受力梁抗弯试验全过程理论分析[J].结构工程师.2005,21(2):43-49.
[8]叶列平,庄江波,曾攀等.预应力碳纤维布加固钢筋混凝土T形梁的试验研究[J].工业建筑.2005,35,(8):7-12.
[9]沙乌列提,叶列平.预应力CFRP布加固钢筋混凝土梁的施工技术[J].施工技术.2004,33(6):23-24.
[10] M.Basle and R.Clenin.bridge strengthening with prestressed CFRP plate systems[C]. Advanced Composite Materials in Bridges and Structures Materiaux Composites D’Avant-garde Pour Ponts et Charpentes Calgary,Alberta,July 20-23,2004:1-8.
[11] H.N.Garden and L.C.Hollaway.An experimental study of the failure modes of reinforced concrete beams strengthened with prestressed carbon composite plates[J].Composites Part B,29B,1998:411-424.
[12]梅力彪、张俊平.预应力碳纤维板加固混凝土梁的粘结锚固性能试验研究[J].工业建筑.2006,36(4):15-18.
[13]卓静,李唐宁,章庆学,周密.波形齿夹具锚与碳纤维布U形箍锚固作用的对比试验[J].建筑结构.2006,36(3):22-24.
[14]卓静,李唐宁,章庆学,周密.锚固多层碳纤维布加固钢筋混凝土梁的试验研究[J].建筑结构.2006,36(3):25-27.
[15]李庆伟、杨勇新、岳清瑞等.预应力碳纤维布加固混凝土梁锚固方式试验研究[J].工业建筑.2006,36(4):5-8.
[16]杨勇新,李庆伟,岳清瑞.预应力碳纤维布加固混凝土梁预应力损失试验研究[J].工业建筑.2006,36(4):5-8.
[17]卓静,李唐宁.FRP片材波形齿夹具锚的原理[J].土木工程学报,2005,vol38(10).
[18]刘磊.波形锚具设计试验研究[D].重庆:重庆大学土木工程学院,2007.
[19]张龙生,李唐宁,陈小英.波形齿夹具锚横向张拉CFRP片材的试验研究[J].工业建筑.2007年11月:74-77.
[20]卓静,李唐宁.波形齿夹锚在碳纤维片材加固技术及预应力技术中应用研究[J].公路交通技术增刊.2005年7月:100-104.
[21]卓静,李唐宁,章庆学,周密.锚固多层碳纤维布加固钢筋混凝土梁的试验研究[J].建筑结构.2006,36(3):25-27.
[22]卓静,李唐宁,邢世建,周密.一种锚固FRP片材的体外预应力新方法[J].土木工程学报.2007,40(1):15-20.
[23]卓静,李唐宁,章庆学,周密.波形齿夹具锚锚固碳纤维布加固混凝土梁试验研究[J].建筑结构. 2005,35(7):63-66.
[24]牛斌.体外预应力混凝土梁极限状态分析[J].土木工程学报.2000,6.
[25] Deuring . M . Post-strenthenning of concrete structrues with pretebsioned Advanced Composites[R].EMPA Report NO.224,CH-8600 Duebendorf,1993.
[26]东南大学,天津大学,同济大学,清华大学.混凝土结构[M].北京:中国建筑工业出版社,2001.
[27]王兴国.预应力纤维片材加固混凝土梁抗弯性能研究[D].中南大学,2007.
[28] Reda et al.Advanced Composite Materials for Post-Tensioning Applications:Merits,Shortcomings and Possibilities[J] . Proceedings of the International Conference on Engineering Materials,1997,l1(21).
[29] Meier. Extending the Life of Cables by the Use of Carbon Fibres[J].IABSE Symposium,1995,9:1235-1240.
[30] Meier.U.Strengthening of structures with CFRP laminates:research and applications in Switzerland[J] . In Advanced Composite Materials in Bridges and Structures.Ed.K.W.Neale and P.LabossiereL:243-251.
[31] Hollaway.L.C.Use of advanced composites in highway structures[J]. Report written for the SERCDTp/LINK Project,1993,2.
[32] Karam.G..N.Optimal design for prestressing with FRP sheets in structural members[J]. In Advanced Composite Materials in Bridges and Structures,ed. K.W.Neale and P.Labossiere:277-285.
[33] Triantallou.T.C.Innovative prestressing with FRP sheets: mechanics of short-term behaviour. [J].Eng.Mech.1991, 117(7):1652-1672.