水泥复合砂浆钢筋网加固混凝土伸臂梁抗剪性能试验研究与理论分析
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摘要
水泥复合砂浆钢筋网加固RC构件是一种新型的加固方法,具有众多优点。本文对水泥复合砂浆钢筋网加固混凝土伸臂梁的抗剪性能进行了试验研究,并进行了理论分析,主要内容如下:
1.比较分析了各种常用混凝土加固方法的主要特点,论述了水泥复合砂浆钢筋网加固方法的优越性。
2.进行了5根混凝土伸臂梁的水泥复合砂浆钢筋网抗剪加固试验,测量了试件的挠度、应变、承载力,观察记录了试验现象,分析了剪跨比、弯矩比、钢筋网配筋率、加固形式等因素对构件抗剪性能的影响,并与混凝土未加固梁进行了比较。
3.分析了加固梁的抗剪加固机理,认为水泥复合砂浆钢筋网的作用与箍筋在抗剪时的作用机理是基本一致的,通过试验研究水泥复合砂浆钢筋网在抗剪时的贡献,并以桁架—拱模型为理论基础,分析了水泥复合砂浆钢筋网抗剪加固混凝土伸臂梁的作用机理。
4.根据试验结果,建立了水泥复合砂浆钢筋网抗剪加固混凝土伸臂梁的计算公式,计算结果与试验结果较吻合。
5.施工质量的好坏对于加固效果至关重要,最后本文论述了实际操作中的施工工艺以及需要注意的技术要求。
A new RC strengthening method with CMMR(composite mortar laminate reinforced with mesh reinforcement) has a lot of advantages.The experimental study on the shear performance of overhanging reinforced concrete beams was carried on in this paper. The main contents are as follows:
1. Based on the comparison with common strengthening methods of RC structure, the advantage of strengthening method with CMMR is discoursed.
2.The shear performance of five overhanging reinforced concrete beams strengthened with CMMR was experimented, the deflection,strain and load capacity was tested, the experimental phenomenon was observed. The effects of shear-span ratio, moment ratio, web reinforcement ratio of CMMR, style of loading, preloading on strengthening is discussed, and compared with RC beams using ordinary stirrup.
3. The shear mechanism of the RC beams is discussed in the paper. It is assumed that the shear mechanism of CMMR is consistent with the stirrup, so the contribution of CMMR can be investigated by experiments. And the truss-arch model is introduced to Analyze the strengthening mechanism of CMMR to overhanging reinforced concrete beams.
4. According to the test results, the computational formula of the shear load capacity of overhanging reinforced concrete beams strengthened with CMMR is established. And the theoretical results agree with the experiment results basically.
5. The construction quality is very important to effect of strengthening, the cource of construction and the technical requirements are presented at last.
1.比较分析了各种常用混凝土加固方法的主要特点,论述了水泥复合砂浆钢筋网加固方法的优越性。
2.进行了5根混凝土伸臂梁的水泥复合砂浆钢筋网抗剪加固试验,测量了试件的挠度、应变、承载力,观察记录了试验现象,分析了剪跨比、弯矩比、钢筋网配筋率、加固形式等因素对构件抗剪性能的影响,并与混凝土未加固梁进行了比较。
3.分析了加固梁的抗剪加固机理,认为水泥复合砂浆钢筋网的作用与箍筋在抗剪时的作用机理是基本一致的,通过试验研究水泥复合砂浆钢筋网在抗剪时的贡献,并以桁架—拱模型为理论基础,分析了水泥复合砂浆钢筋网抗剪加固混凝土伸臂梁的作用机理。
4.根据试验结果,建立了水泥复合砂浆钢筋网抗剪加固混凝土伸臂梁的计算公式,计算结果与试验结果较吻合。
5.施工质量的好坏对于加固效果至关重要,最后本文论述了实际操作中的施工工艺以及需要注意的技术要求。
A new RC strengthening method with CMMR(composite mortar laminate reinforced with mesh reinforcement) has a lot of advantages.The experimental study on the shear performance of overhanging reinforced concrete beams was carried on in this paper. The main contents are as follows:
1. Based on the comparison with common strengthening methods of RC structure, the advantage of strengthening method with CMMR is discoursed.
2.The shear performance of five overhanging reinforced concrete beams strengthened with CMMR was experimented, the deflection,strain and load capacity was tested, the experimental phenomenon was observed. The effects of shear-span ratio, moment ratio, web reinforcement ratio of CMMR, style of loading, preloading on strengthening is discussed, and compared with RC beams using ordinary stirrup.
3. The shear mechanism of the RC beams is discussed in the paper. It is assumed that the shear mechanism of CMMR is consistent with the stirrup, so the contribution of CMMR can be investigated by experiments. And the truss-arch model is introduced to Analyze the strengthening mechanism of CMMR to overhanging reinforced concrete beams.
4. According to the test results, the computational formula of the shear load capacity of overhanging reinforced concrete beams strengthened with CMMR is established. And the theoretical results agree with the experiment results basically.
5. The construction quality is very important to effect of strengthening, the cource of construction and the technical requirements are presented at last.
引文
[1] 曹双寅,邱洪兴,王恒华.结构可靠性鉴定与加固技术.北京:中国水利水电出版社,2002,1-5
[2] 建筑结构补强加固技术编写组. 建筑结构补强加固技术.北京:中国铁道出版社,1987,40-42
[3] 唐业清,万墨林. 建筑物改造与病害处理. 北京:中国建筑工业出版社, 2000,93-95
[4] 王海东.钢筋混凝土约束梁斜向贴 CFRP 抗剪加固试验研究及理论分析:[硕士学位论文]. 长沙:湖南大学土木工程学院,2001,5-9
[5] 彭晖. 预应力碳纤维布加固混凝土受弯构件的试验研究:[硕士学位论文]. 长沙:湖南大学土木工程学院,2002,5-8
[6] 黄慧明. 碳纤维布加固混凝土受弯构件的试验研究:[硕士学位论文]. 长沙:湖南大学土木工程学院,2001,6-8
[7] 曾令宏.钢丝网复合砂浆加固混凝土受弯构件的试验研究:[硕士学位论文]. 长沙:湖南大学土木工程学院,2003,7-8
[8] 罗立波. 水泥复合砂浆钢筋网加固混凝土梁抗剪性能试验研究:[硕士学位论文]. 长沙:湖南大学土木工程学院,2006,9-10
[9] Romualdi.Ferrocement for infrastructure rehabilitation.Concrete International: Design and Construction, 1987,9(9):24-28
[10] Irons. Laminated for better repair. Concrete International: Design and Construction, 1987,9(9):34-38
[11] Sharma.Tests of Reinforced Concrete Continuous Beams with and without Ferrocement.Concrete International,1992,14(3):36-40
[12] Logan D,Shah S P.Moment Capacity and Cracking Behaviour of Ferrocement in Flexure.Journal of the American Concrete Institute,1973,70(12):799-804
[13] Chien-Hung Lin,Shyh-Ming Perng.Flexural Behaviour of Concrete Beams with Welded Fabric as Shear Reinforced.ACI Structural Journal,1998,95(5):540-546
[14] Aurellado P G.Performance of Repaired Reinforced Concrete T—Beams[D]. National University of Singapore,1994
[15] Ong K C G,Paramasivam P,Lim C T E.Flexural strengthening of Reinforced Concrete Beams using Ferrocement Laminate. Journal of Ferrocement, 1992, 2(24): 331-342
[16] Deasayi P, Kumar N N. Strength and Behaviour Ferrocement in Shear. Cement & Concrete Composites,1992,14:33-45
[17] Mansur M A,Ong K C G.Shear Strength of Ferrocement I-Beams.ACI Structural Journal,1991,88(4):458-464
[18] 黄忠邦.国外关于钢筋网水泥砂浆抗震加固的研究.建筑结构,1994,9:41-43
[19] 熊光晶,Singh G. 保护层的质和量与镀锌焊接钢丝网水泥的耐久性.水利学报,1998,7:41-43
[20] 熊光晶.焊接钢丝网水泥弯曲极限承载力的计算.建筑结构学报,1997,18(1): 33-40
[21] 黄忠邦.水泥砂浆及钢筋网水泥砂浆面层加固砖砌体试验.天津大学学报, 1994,27(6):764-770
[22] Shang S P,Zeng L H,Peng H.Flexural Strengthening Of Reinforced Concrete Beam With Ferrocement.Proceedings of the 28th Conference on Our World in Concrete & Structures,Singapore,August 28-29,2003:501-508
[23] 尚守平,曾令宏,陈大川,等.钢丝网复合砂浆加固 RC 梁的受弯试验研究.第六届全国建筑物鉴定与加固改造学术会议论文集.长沙:湖南大学出版社,2002, 727-732
[24] 尚守平,曾令宏,彭晖,等.复合砂浆钢丝网加固 RC 受弯构件的试验研究.建筑结构学报,2003,24(6):87-91
[25] 尚守平,蒋隆敏,张毛心.钢筋网水泥复合砂浆加固 RC 偏心受压柱的试验研究.建筑结构学报,2005,26(2):18-33
[26] 聂建国,王寒冰,张天申,等.高强不锈钢绞线网-渗透性聚合砂浆抗弯加固的试验研究.建筑结构学报,2005,26(2):1-9
[27] 聂建国,蔡奇,张天申,等.高强不锈钢绞线网-渗透性聚合砂浆抗剪加固的试验研究.建筑结构学报,2005,26(2):10-17
[28] 蒋隆敏,张毛心.国内外关于钢丝网水泥砂浆用于 RC 结构加固的研究. 世界地震工程,2004,20(2):139-144
[29] 过镇海,时旭东.钢筋混凝土原理和分析.北京:清华大学出版社,2003:293-294
[30] 蒋隆敏,尚守平,黄政宇.一种适用于钢丝筋网水泥加固 RC 结构的纤维增强复合砂浆和界面剂.土木工程学报,2005,38(5):41-47
[31] 湖南大学,天津大学,同济大学等.建筑材料.北京:中国建筑工业出版社,2001: 272-273
[32] 朱大宇.水泥土抗压强度影响因素的试验分析.建筑技术, 2006,37(3):218-220
[33] 顾万黎.《冷轧带肋钢筋混凝土结构技术规程》JGJ95-95 概况介绍.工业建筑, 1995,8:42-48
[34] 胡秀兰,祝明桥.冷轧带肋钢筋混凝土受弯构件的变形和裂缝研究分析.建筑结构,1997,27(5):48-52
[35] 沈蒲生 .我国冷轧带肋钢筋混凝土结构发展状况和存在问题 .建筑技术 , 1998,29(2):99-101
[36] 普通混凝土力学性能试验方法(GBJ81-85) .北京:中国建筑工业出版社,1985:9-16
[37] A. A. 格沃兹杰夫等,钢筋混凝土强度问题新论.中国建筑工业出版社,1982:71-237
[38] M.P.Nielsen. Limit Analysis and Concrete Plasticity A. 1984 by Prentice-Hall, Inc., Englewood Cliffs, New Jersey 07632, 1984
[39] Frank J.Vecchio and Michael P. Collins, The Modified Compression-Field Theory for Reinforced Concrete Elements Subjected to Shear, ACI Journal, Mar- Apr 1986
[40] T.ICHINOSE,A Shear Design Equation for Ductile R/C Members, Earthquake Engineering and Structural Dynamics,Vol.21,1992
[41] 刘立新.钢筋混凝土深梁、短梁和浅梁受剪承载力的统一计算方法,建筑结构学报,1995,16(4):13-21
[42] 曾令宏.高性能复合砂浆钢筋(丝)网加固混凝土梁试验研究与理论分析:[博士学位论文]. 长沙:湖南大学土木工程学院,2006,184-185
[2] 建筑结构补强加固技术编写组. 建筑结构补强加固技术.北京:中国铁道出版社,1987,40-42
[3] 唐业清,万墨林. 建筑物改造与病害处理. 北京:中国建筑工业出版社, 2000,93-95
[4] 王海东.钢筋混凝土约束梁斜向贴 CFRP 抗剪加固试验研究及理论分析:[硕士学位论文]. 长沙:湖南大学土木工程学院,2001,5-9
[5] 彭晖. 预应力碳纤维布加固混凝土受弯构件的试验研究:[硕士学位论文]. 长沙:湖南大学土木工程学院,2002,5-8
[6] 黄慧明. 碳纤维布加固混凝土受弯构件的试验研究:[硕士学位论文]. 长沙:湖南大学土木工程学院,2001,6-8
[7] 曾令宏.钢丝网复合砂浆加固混凝土受弯构件的试验研究:[硕士学位论文]. 长沙:湖南大学土木工程学院,2003,7-8
[8] 罗立波. 水泥复合砂浆钢筋网加固混凝土梁抗剪性能试验研究:[硕士学位论文]. 长沙:湖南大学土木工程学院,2006,9-10
[9] Romualdi.Ferrocement for infrastructure rehabilitation.Concrete International: Design and Construction, 1987,9(9):24-28
[10] Irons. Laminated for better repair. Concrete International: Design and Construction, 1987,9(9):34-38
[11] Sharma.Tests of Reinforced Concrete Continuous Beams with and without Ferrocement.Concrete International,1992,14(3):36-40
[12] Logan D,Shah S P.Moment Capacity and Cracking Behaviour of Ferrocement in Flexure.Journal of the American Concrete Institute,1973,70(12):799-804
[13] Chien-Hung Lin,Shyh-Ming Perng.Flexural Behaviour of Concrete Beams with Welded Fabric as Shear Reinforced.ACI Structural Journal,1998,95(5):540-546
[14] Aurellado P G.Performance of Repaired Reinforced Concrete T—Beams[D]. National University of Singapore,1994
[15] Ong K C G,Paramasivam P,Lim C T E.Flexural strengthening of Reinforced Concrete Beams using Ferrocement Laminate. Journal of Ferrocement, 1992, 2(24): 331-342
[16] Deasayi P, Kumar N N. Strength and Behaviour Ferrocement in Shear. Cement & Concrete Composites,1992,14:33-45
[17] Mansur M A,Ong K C G.Shear Strength of Ferrocement I-Beams.ACI Structural Journal,1991,88(4):458-464
[18] 黄忠邦.国外关于钢筋网水泥砂浆抗震加固的研究.建筑结构,1994,9:41-43
[19] 熊光晶,Singh G. 保护层的质和量与镀锌焊接钢丝网水泥的耐久性.水利学报,1998,7:41-43
[20] 熊光晶.焊接钢丝网水泥弯曲极限承载力的计算.建筑结构学报,1997,18(1): 33-40
[21] 黄忠邦.水泥砂浆及钢筋网水泥砂浆面层加固砖砌体试验.天津大学学报, 1994,27(6):764-770
[22] Shang S P,Zeng L H,Peng H.Flexural Strengthening Of Reinforced Concrete Beam With Ferrocement.Proceedings of the 28th Conference on Our World in Concrete & Structures,Singapore,August 28-29,2003:501-508
[23] 尚守平,曾令宏,陈大川,等.钢丝网复合砂浆加固 RC 梁的受弯试验研究.第六届全国建筑物鉴定与加固改造学术会议论文集.长沙:湖南大学出版社,2002, 727-732
[24] 尚守平,曾令宏,彭晖,等.复合砂浆钢丝网加固 RC 受弯构件的试验研究.建筑结构学报,2003,24(6):87-91
[25] 尚守平,蒋隆敏,张毛心.钢筋网水泥复合砂浆加固 RC 偏心受压柱的试验研究.建筑结构学报,2005,26(2):18-33
[26] 聂建国,王寒冰,张天申,等.高强不锈钢绞线网-渗透性聚合砂浆抗弯加固的试验研究.建筑结构学报,2005,26(2):1-9
[27] 聂建国,蔡奇,张天申,等.高强不锈钢绞线网-渗透性聚合砂浆抗剪加固的试验研究.建筑结构学报,2005,26(2):10-17
[28] 蒋隆敏,张毛心.国内外关于钢丝网水泥砂浆用于 RC 结构加固的研究. 世界地震工程,2004,20(2):139-144
[29] 过镇海,时旭东.钢筋混凝土原理和分析.北京:清华大学出版社,2003:293-294
[30] 蒋隆敏,尚守平,黄政宇.一种适用于钢丝筋网水泥加固 RC 结构的纤维增强复合砂浆和界面剂.土木工程学报,2005,38(5):41-47
[31] 湖南大学,天津大学,同济大学等.建筑材料.北京:中国建筑工业出版社,2001: 272-273
[32] 朱大宇.水泥土抗压强度影响因素的试验分析.建筑技术, 2006,37(3):218-220
[33] 顾万黎.《冷轧带肋钢筋混凝土结构技术规程》JGJ95-95 概况介绍.工业建筑, 1995,8:42-48
[34] 胡秀兰,祝明桥.冷轧带肋钢筋混凝土受弯构件的变形和裂缝研究分析.建筑结构,1997,27(5):48-52
[35] 沈蒲生 .我国冷轧带肋钢筋混凝土结构发展状况和存在问题 .建筑技术 , 1998,29(2):99-101
[36] 普通混凝土力学性能试验方法(GBJ81-85) .北京:中国建筑工业出版社,1985:9-16
[37] A. A. 格沃兹杰夫等,钢筋混凝土强度问题新论.中国建筑工业出版社,1982:71-237
[38] M.P.Nielsen. Limit Analysis and Concrete Plasticity A. 1984 by Prentice-Hall, Inc., Englewood Cliffs, New Jersey 07632, 1984
[39] Frank J.Vecchio and Michael P. Collins, The Modified Compression-Field Theory for Reinforced Concrete Elements Subjected to Shear, ACI Journal, Mar- Apr 1986
[40] T.ICHINOSE,A Shear Design Equation for Ductile R/C Members, Earthquake Engineering and Structural Dynamics,Vol.21,1992
[41] 刘立新.钢筋混凝土深梁、短梁和浅梁受剪承载力的统一计算方法,建筑结构学报,1995,16(4):13-21
[42] 曾令宏.高性能复合砂浆钢筋(丝)网加固混凝土梁试验研究与理论分析:[博士学位论文]. 长沙:湖南大学土木工程学院,2006,184-185