既有钢筋混凝土柱后接梁连接的抗剪承载力试验研究
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摘要
既有钢筋混凝土柱后接梁是在原有柱侧后接梁的加固改造方法,一般是通过植筋技术在柱侧植筋后再接梁,希望梁柱接头能够成为刚性节点。为保证梁端剪力有效的传递,梁柱接头会采用不同的连接方式。但后接梁柱接头往往会成为结构的最薄弱环节,接头连接的好坏,将影响着结构的抗震性、整体性和稳定性。
目前,对于既有钢筋混凝土柱后接梁接头的连接型式、受力性能特点及承载力计算方法研究的较少,因此设计时缺乏足够的理论基础。鉴于此,本文通过对齿槽式、外贴钢板齿槽式和无齿直缝后植弯起钢筋式三种不同柱后接梁接头型式共9个足尺试件的静力试验,研究了在不同剪跨比作用下三种型式接头的受力性能和变形特点,并将同一剪跨下不同型式接头以及不同剪跨下相同型式接头的受力性能进行了对比分析。
对于齿槽式接头,当剪跨比λ< 0.5时,齿槽剪切破坏,齿槽截面是控制截面;当剪跨比λ≥0.5时,后接梁发生剪弯破坏,齿槽截面并不起主要控制作用,还取决于后接梁的强度。
外贴钢板齿槽式接头在剪跨比λ≥0.5时,后接梁剪弯破坏,钢板未发生剪切滑移,接头承载力取决于后接梁的强度。
对于无齿直缝植弯起钢筋式接头,当剪跨比λ≥0.5时,首先发生整浇梁的剪弯破坏,此时后接梁表现出剪弯的受力特征,接头截面不起主要控制作用。
试验结果表明,无齿直缝植弯起钢筋式接头具有较高的抗剪承载力,且接头的整体性较好,刚性较高,可以达到整浇节点的抗剪水平。
结合接头抗剪承载力实测结果,建立各种型式接头的抗剪承载力计算公式,且所提建议公式与试验结果吻合较好,从而能为实际工程中柱后接梁加固设计提供一些理论依据和实际参考。
Post-casted beam connected on existing reinforced concrete column is a method of strengthening and rebuilding, it casts the beam onto the side of column through the technique of inserting reinforced bars, it is hoped that the joint of beam-column will be rigid. In order to transfer the shear of beam efficiently, different kinds of connections can be used in the joint of beam-column. But the joint of beam-column is always the weakest part of the structure, so the connections of beam-column will impact the seismic behavior, monolithic and stability of the whole structure.
At present, the researches on the connections of beam-column, mechanics characteristic and the methods of shear calculation are few, so the theories for engineering design are scarce. Therefore, a total of 9 tests were conducted on three kinds of full scale beam-column connections, including tooth-grooved connection, sticking steel plate welded angle iron connection and roughened interface with inserting bent-up bars connection. Studied the mechanics behavior and deformation characteristic of the three kinds of connections at different shear-span ratios, compared the behavior of different connections at the same shear-span ratio, and the behavior of the same connection at different shear-span ratios.
For the tooth-grooved connection, when the shear-span ratioλ< 0.5, it happens shear failure of the tooth-groove, the section of tooth-groove is the dominance section; when the shear-span ratioλ≥0.5, it happens shear-flexural failure of the post-casted beam, the section of tooth-groove is not only the dominating factor, it also depends on the strength of post-casted beam. For the sticking steel plate welded angle iron connection, when the shear-span ratioλ≥0.5, it happens shear-flexural failure of the post-casted beam, there is no shear slippage between steel plate and column, the shear capacity of connection lies on the strength of post-casted beam.
For the roughened interface with inserting bent-up bars connection, when the shear-span ratioλ≥0.5, the monolithic beam shows shear-flexural failure, and the post-casted beam shows shear-flexural behavior. The section of connection can not mainly determine its shear capacity.
The test results indicates that the roughened interface with inserting bent-up bars connection has higher shear capacity, and it shows better monolithic and higher rigidity, so this kind of connection has the same behavior as the monolithic joint.
According to the test results, the formula used to calculate the shear capacity of connections are proposed in this paper, it is shown that the theoretical values are in good agreement with that of the test one, and it can be used as reference in engineering practice.
目前,对于既有钢筋混凝土柱后接梁接头的连接型式、受力性能特点及承载力计算方法研究的较少,因此设计时缺乏足够的理论基础。鉴于此,本文通过对齿槽式、外贴钢板齿槽式和无齿直缝后植弯起钢筋式三种不同柱后接梁接头型式共9个足尺试件的静力试验,研究了在不同剪跨比作用下三种型式接头的受力性能和变形特点,并将同一剪跨下不同型式接头以及不同剪跨下相同型式接头的受力性能进行了对比分析。
对于齿槽式接头,当剪跨比λ< 0.5时,齿槽剪切破坏,齿槽截面是控制截面;当剪跨比λ≥0.5时,后接梁发生剪弯破坏,齿槽截面并不起主要控制作用,还取决于后接梁的强度。
外贴钢板齿槽式接头在剪跨比λ≥0.5时,后接梁剪弯破坏,钢板未发生剪切滑移,接头承载力取决于后接梁的强度。
对于无齿直缝植弯起钢筋式接头,当剪跨比λ≥0.5时,首先发生整浇梁的剪弯破坏,此时后接梁表现出剪弯的受力特征,接头截面不起主要控制作用。
试验结果表明,无齿直缝植弯起钢筋式接头具有较高的抗剪承载力,且接头的整体性较好,刚性较高,可以达到整浇节点的抗剪水平。
结合接头抗剪承载力实测结果,建立各种型式接头的抗剪承载力计算公式,且所提建议公式与试验结果吻合较好,从而能为实际工程中柱后接梁加固设计提供一些理论依据和实际参考。
Post-casted beam connected on existing reinforced concrete column is a method of strengthening and rebuilding, it casts the beam onto the side of column through the technique of inserting reinforced bars, it is hoped that the joint of beam-column will be rigid. In order to transfer the shear of beam efficiently, different kinds of connections can be used in the joint of beam-column. But the joint of beam-column is always the weakest part of the structure, so the connections of beam-column will impact the seismic behavior, monolithic and stability of the whole structure.
At present, the researches on the connections of beam-column, mechanics characteristic and the methods of shear calculation are few, so the theories for engineering design are scarce. Therefore, a total of 9 tests were conducted on three kinds of full scale beam-column connections, including tooth-grooved connection, sticking steel plate welded angle iron connection and roughened interface with inserting bent-up bars connection. Studied the mechanics behavior and deformation characteristic of the three kinds of connections at different shear-span ratios, compared the behavior of different connections at the same shear-span ratio, and the behavior of the same connection at different shear-span ratios.
For the tooth-grooved connection, when the shear-span ratioλ< 0.5, it happens shear failure of the tooth-groove, the section of tooth-groove is the dominance section; when the shear-span ratioλ≥0.5, it happens shear-flexural failure of the post-casted beam, the section of tooth-groove is not only the dominating factor, it also depends on the strength of post-casted beam. For the sticking steel plate welded angle iron connection, when the shear-span ratioλ≥0.5, it happens shear-flexural failure of the post-casted beam, there is no shear slippage between steel plate and column, the shear capacity of connection lies on the strength of post-casted beam.
For the roughened interface with inserting bent-up bars connection, when the shear-span ratioλ≥0.5, the monolithic beam shows shear-flexural failure, and the post-casted beam shows shear-flexural behavior. The section of connection can not mainly determine its shear capacity.
The test results indicates that the roughened interface with inserting bent-up bars connection has higher shear capacity, and it shows better monolithic and higher rigidity, so this kind of connection has the same behavior as the monolithic joint.
According to the test results, the formula used to calculate the shear capacity of connections are proposed in this paper, it is shown that the theoretical values are in good agreement with that of the test one, and it can be used as reference in engineering practice.
引文
1王永维.我国建筑物鉴定与加固改造技术现状与展望.谢慧才,罗苓隆,赵晓华,刘金伟.第五届全国建筑物鉴定与加固改造学术讨论会,汕头, 2000.汕头大学出版社:1~2
2唐业清,万墨林.建筑改造与病害处理.中国建筑工业出版社, 2000:172
3孙铁东,张成君,孙毅.采用齿槽法设置后置托梁的工程实例.唐岱新,王凤来.第八届全国建筑物鉴定与加固改造学术会议,哈尔滨, 2006.北京,中国建材工业出版社:1072~1075
4唐九如.钢筋混凝土框架节点抗震.东南大学出版社. 1989:197
5南京工学院.装配式钢筋混凝土框架梁柱齿槽接头的试验研究.钢筋混凝土结构研究报告选集(2). 1981, 341~367
6工民建教研组.齿槽式梁柱接头受力性能及计算方法的研究.南京工学院学报. 1978,(2):69~129
7章文纲,程铁生,迟维胜,邵式亮.装配式框架钢纤维混凝土齿槽节点.建筑结构学报. 1995, 16(3):52~58
8抗剪计算研究组.钢筋混凝土构件斜截面抗剪强度计算.钢筋混凝土结构研究报告选集. 1977:125~132
9 Gifford, F.W.. Tests on Column-Beam Connections for Precast Concrete Frames. Civil Engineering and Public Works Review, 1960,55(652):1434
10 Holmes, M., Bond. Tests on A Beam-Column Connection for Precast Concrete. The Structural Engineering, 1963,41(9):293~297
11 J.R.Janney, Panl H.Kaar. Suggested Design of Joints and Connections in Precast Structural Concrete. ACI Structural Journal, 1964,61(8):921~936
12 Holmes, Posner, C.D.. Factors Affecting the Strength of Steel Plate Connection between Precast Concrete Elements. The structural Engineer, 1970,48(10):399~406
13 Paulay T., Park R., Phillips M.H.. Horizontal Construction Joints in Cast-in-Place Reinforced Concrete. ACI, 1974:599~610
14 E.W.Bennett, S.Banerjee. Strength of Beam-Column Connections with Dowel Reinforcement. The Structural Engineer. 1976, 54(4):133~139
15 Rasmussen, B.H. Strength of Transversely Loaded Bolts and Dowels Cast into - 85 -Concrete. Magazine of Concrete Research. 1962,34(2):31~33
16 Tsoukantas S.G., Tassios T.P.. Shear Resistant of Connections between Reinforced Concrete Linear Precast Elements. ACI Structural Journal. 1989,86(3):242~249
17 Robert A.Bass, James O.Jirsa. Shear Transfer across New and Exsiting Concrete Interface. ACI Structural Journal. 1989,86(4):383~393
18 ACI-ASCE, Committee 550. Design Recommendation for Precast Concrete Structures. ACI Structural Journal. 1993,90(1):1~2
19 Moshe A.Din, David Z.Yankelevsky, Daniel N.Farkey. Cyclic Behavior of Epoxy-Repaired Reinforced Concrete Beam-Column Joints. ACI Structural Journal. 1993,90(2):170~179
20 S.T.Mau, Thomas T.C.Hsu. Shear Design and Analysis of Low-Rise Structural Wall. ACI Structural Journal. 1986,80(2):112~114
21 Khaled S.Soubra, James K.Wight, Antoine E.Naamar. Cyclic Response of Fibrous Cast-in-Plane Connections in Precast Beam-Column Subassemblages. ACI Structural Journal. 1993,90(3):316~322
22 Allowood R.J.. Reinforcement Stresses in a Reinforced Concrete Beam-Column Connection. Magazine of Concrete Research. 1980,32(112):143~146
23朱幼麟译.极限荷载下大板接头的性能.建筑结构. 1981,(5):54~58
24美国内务部垦务局编,王圣培等译.混凝土手册.水利电力出版社. 1990:42~43
25韩菊红,袁群,张雷顺.新老混凝土粘结面粗糙度处理实用方法探讨.工业建筑. 2001,31(2):1~3
26 Climaco J.C.T.S, R.E. Evaluation of Bond Strength between Old and New Concrete in Structural Repairs. Magzine of Concrete Research. 2001,53(6):377~385
27李冰.新老混凝土粘结面渗透试验研究.郑州大学硕士论文. 2004:24~26
28王二花.植筋法新老混凝土粘结面剪切性能试验研究.郑州大学硕士论文. 2006:24~44
29中国有色工程设计研究总院.混凝土结构构造手册.中国建筑工业出版社. 2003:544~545
30王忠德,张彩霞,方碧华,张照华.实用建筑材料手册.中国建筑工业出版社. 2003:284~411
31张绍麟.混凝土的劈裂抗拉强度与轴心抗拉强度的理论关系和试验对比.铁道科学与工程学报. 1979,(2):77~78
32物理力学专题组.高强混凝土的物理力学性能.钢筋混凝土结构研究报告选集(3). 1994:401~403
33顾念明.对立方体试块测定混凝土劈裂抗拉强度后再作抗压强度试验方法的看法.桥梁建设. 1980,(2):71~73
34段炼,王文长.钢筋混凝土受弯构件刚度计算方法的探讨.太原工学院学报. 1983(2):67~73
35 William J.Krefeld, Charles W.Thurston. Contribution of Longitudinal Steel to Shear Resistance of Reinforced Contrete Beams. ACI Structural Journal. 1966, 63(3):325~343
36 D.N.Acharya, K.O.Kemp. Significance Dowel Forces on The Shear Failure of Rectangular Reinforced Concrete Beams without Web Reinforcement. ACI Structural Journal. 1965,62(10):1265~1278
37 S.U.Pillai, D.W.Kirk. Ductile Beam-Column Connection in Precast Concrete. ACI Structural Journal. 1981, 27(1):480~487
38施岚青.钢筋混凝土构件抗剪能力计算的几点建议.清华大学学报. 1973, 31(1):54~81
39万墨林,韩继云.混凝土结构加固技术的研究(二).施工技术. 1994,(2):47
40高学敏.粘结和粘结技术手册.四川科学技术出版社. 1990:50
41纪樟斌,熊广晶,何志华.一种可显著提高纤维布与混凝土粘结强度的液垫加压施工方法.工业建筑. 2004,34(12):83~84
42马晓升,熊光晶,纪樟斌.接触压对纤维布与混凝土粘结强度的影响.建筑技术开发. 2004,31(3):47~48
43刘向华.植筋粘结锚固性能的试验研究及可靠度分析.合肥工业大学硕士论文. 2004:42~45
44 Zaliaris K.D.. An Experimental Study of Adhesively Bonded Anchorages in Concrete. Magazine of Concrete Research. 1996,48(175):79~93
45 Cook R.A.. Behavior of Chemically Bonded Anchors. Journal of Structural Engineering. 1993,119(9):74~76
46刘辉.植筋技术应用试验研究.兰州理工大学硕士论文. 2004:30~34
47倪修国.化学植筋节点在低周反复荷载作用下的抗震性能试验研究.合肥工业大学硕士论文. 2005:42~48
48王传志,腾智明.钢筋混凝土结构理论.中国建筑工业出版社. 1985:180~372
49张炳林.化学植筋在混凝土结构改造过程中的应用研究.同济大学硕士论文. 2005:46~61
2唐业清,万墨林.建筑改造与病害处理.中国建筑工业出版社, 2000:172
3孙铁东,张成君,孙毅.采用齿槽法设置后置托梁的工程实例.唐岱新,王凤来.第八届全国建筑物鉴定与加固改造学术会议,哈尔滨, 2006.北京,中国建材工业出版社:1072~1075
4唐九如.钢筋混凝土框架节点抗震.东南大学出版社. 1989:197
5南京工学院.装配式钢筋混凝土框架梁柱齿槽接头的试验研究.钢筋混凝土结构研究报告选集(2). 1981, 341~367
6工民建教研组.齿槽式梁柱接头受力性能及计算方法的研究.南京工学院学报. 1978,(2):69~129
7章文纲,程铁生,迟维胜,邵式亮.装配式框架钢纤维混凝土齿槽节点.建筑结构学报. 1995, 16(3):52~58
8抗剪计算研究组.钢筋混凝土构件斜截面抗剪强度计算.钢筋混凝土结构研究报告选集. 1977:125~132
9 Gifford, F.W.. Tests on Column-Beam Connections for Precast Concrete Frames. Civil Engineering and Public Works Review, 1960,55(652):1434
10 Holmes, M., Bond. Tests on A Beam-Column Connection for Precast Concrete. The Structural Engineering, 1963,41(9):293~297
11 J.R.Janney, Panl H.Kaar. Suggested Design of Joints and Connections in Precast Structural Concrete. ACI Structural Journal, 1964,61(8):921~936
12 Holmes, Posner, C.D.. Factors Affecting the Strength of Steel Plate Connection between Precast Concrete Elements. The structural Engineer, 1970,48(10):399~406
13 Paulay T., Park R., Phillips M.H.. Horizontal Construction Joints in Cast-in-Place Reinforced Concrete. ACI, 1974:599~610
14 E.W.Bennett, S.Banerjee. Strength of Beam-Column Connections with Dowel Reinforcement. The Structural Engineer. 1976, 54(4):133~139
15 Rasmussen, B.H. Strength of Transversely Loaded Bolts and Dowels Cast into - 85 -Concrete. Magazine of Concrete Research. 1962,34(2):31~33
16 Tsoukantas S.G., Tassios T.P.. Shear Resistant of Connections between Reinforced Concrete Linear Precast Elements. ACI Structural Journal. 1989,86(3):242~249
17 Robert A.Bass, James O.Jirsa. Shear Transfer across New and Exsiting Concrete Interface. ACI Structural Journal. 1989,86(4):383~393
18 ACI-ASCE, Committee 550. Design Recommendation for Precast Concrete Structures. ACI Structural Journal. 1993,90(1):1~2
19 Moshe A.Din, David Z.Yankelevsky, Daniel N.Farkey. Cyclic Behavior of Epoxy-Repaired Reinforced Concrete Beam-Column Joints. ACI Structural Journal. 1993,90(2):170~179
20 S.T.Mau, Thomas T.C.Hsu. Shear Design and Analysis of Low-Rise Structural Wall. ACI Structural Journal. 1986,80(2):112~114
21 Khaled S.Soubra, James K.Wight, Antoine E.Naamar. Cyclic Response of Fibrous Cast-in-Plane Connections in Precast Beam-Column Subassemblages. ACI Structural Journal. 1993,90(3):316~322
22 Allowood R.J.. Reinforcement Stresses in a Reinforced Concrete Beam-Column Connection. Magazine of Concrete Research. 1980,32(112):143~146
23朱幼麟译.极限荷载下大板接头的性能.建筑结构. 1981,(5):54~58
24美国内务部垦务局编,王圣培等译.混凝土手册.水利电力出版社. 1990:42~43
25韩菊红,袁群,张雷顺.新老混凝土粘结面粗糙度处理实用方法探讨.工业建筑. 2001,31(2):1~3
26 Climaco J.C.T.S, R.E. Evaluation of Bond Strength between Old and New Concrete in Structural Repairs. Magzine of Concrete Research. 2001,53(6):377~385
27李冰.新老混凝土粘结面渗透试验研究.郑州大学硕士论文. 2004:24~26
28王二花.植筋法新老混凝土粘结面剪切性能试验研究.郑州大学硕士论文. 2006:24~44
29中国有色工程设计研究总院.混凝土结构构造手册.中国建筑工业出版社. 2003:544~545
30王忠德,张彩霞,方碧华,张照华.实用建筑材料手册.中国建筑工业出版社. 2003:284~411
31张绍麟.混凝土的劈裂抗拉强度与轴心抗拉强度的理论关系和试验对比.铁道科学与工程学报. 1979,(2):77~78
32物理力学专题组.高强混凝土的物理力学性能.钢筋混凝土结构研究报告选集(3). 1994:401~403
33顾念明.对立方体试块测定混凝土劈裂抗拉强度后再作抗压强度试验方法的看法.桥梁建设. 1980,(2):71~73
34段炼,王文长.钢筋混凝土受弯构件刚度计算方法的探讨.太原工学院学报. 1983(2):67~73
35 William J.Krefeld, Charles W.Thurston. Contribution of Longitudinal Steel to Shear Resistance of Reinforced Contrete Beams. ACI Structural Journal. 1966, 63(3):325~343
36 D.N.Acharya, K.O.Kemp. Significance Dowel Forces on The Shear Failure of Rectangular Reinforced Concrete Beams without Web Reinforcement. ACI Structural Journal. 1965,62(10):1265~1278
37 S.U.Pillai, D.W.Kirk. Ductile Beam-Column Connection in Precast Concrete. ACI Structural Journal. 1981, 27(1):480~487
38施岚青.钢筋混凝土构件抗剪能力计算的几点建议.清华大学学报. 1973, 31(1):54~81
39万墨林,韩继云.混凝土结构加固技术的研究(二).施工技术. 1994,(2):47
40高学敏.粘结和粘结技术手册.四川科学技术出版社. 1990:50
41纪樟斌,熊广晶,何志华.一种可显著提高纤维布与混凝土粘结强度的液垫加压施工方法.工业建筑. 2004,34(12):83~84
42马晓升,熊光晶,纪樟斌.接触压对纤维布与混凝土粘结强度的影响.建筑技术开发. 2004,31(3):47~48
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