钢绞线防腐砂浆加固混凝土梁的研究
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摘要
随着经济的发展,建筑工程的重点将从大规模新建阶段逐步向旧建筑维修加固阶段转移,统计资料显示,改建比新建工程可节约投资约40%,工期缩短约50%,收回投资速度比新建快3～4倍,同时大量的自然灾害使许多建筑物受到不同程度的损伤,影响了建筑物的正常使用,而由于时代发展带来的建筑物使用功能的改变以及建筑物自身不可抗拒的老化问题使得加固改造的问题日渐严峻。如何采取有效的加固措施对受损建筑物进行处理以恢复其使用功能是工程技术人员面临的重要课题,也是本文研究的初衷。
钢绞线防腐砂浆加固混凝土构件是一种新型的加固方法。相对于其他的加固方法,防腐砂浆为无机材料,耐久性和耐火性好,并且试验中采用了镀锌钢绞线,它强度高,耐锈蚀性能也较好,加固施工简便,加固后对建筑外观影响很小,所以此加固技术具有比较广阔的应用前景。
本文从工程实际应用的角度,对采用钢绞线防腐砂浆加固后的钢筋混凝土梁进行了试验研究。共试验了8根梁,其中2根为未加固的对比试验梁,6根为用钢绞线防腐砂浆加固的试验梁。试验结果表明,加固梁的承载力和刚度提高明显。
最后在试验的基础上,研究了加固梁的抗弯受力性能和破坏形态及破坏机理,给出了加固梁的刚度计算公式和可用于实际工程设计的承载力计算公式,同时提出了可靠的钢绞线锚固方法以及加固施工方法。
With the development of economy, the focus of buildings will gradually shift from largely constructing new buildings to repairing and reforming of existing buildings. According to statistics, reforming can saves investment by 40% and cuts construction time by 50% and recoups capital outlay two or three times faster than building new ones. Moreover, many new buildings are damaged to different extents by numerous natural disasters, and cannot be put into normal use. Besides, social development has left many buildings outdated and unfit in function and use. Lastly, the aging of buildings is an irresistible problem. All these have made strengthening and reforming of buildings increasingly important and urgent. How to take effective strengthening measures to recover the functions of damaged buildings is an urgent project for all structural engineers, which is also original intention for the present research.The method that steel reinforced concrete member is strengthened with steel strand and anticorrosive mortar is a new strengthening method. Compared with other strengthening methods, since the anticorrosive mortar is a kind of inorganic material with durability and fire-resisting property, and the galvanized steel strand with high strength used in this experiment is hard to be rusted, the method is easy to construct, and after strengthening a building its figure is hardly altered, so these characteristic endow them with a prosperous prospect.Based on the actual application in a project, this thesis aims at the experimental investigation on the performance of steel reinforced concrete beam strengthened with steel strand and anticorrosive mortar, In the experiment eight beams are investigated, two of which were reference beams that is not strengthened, six of which are beams strengthened with steel strand and anticorrosive mortar.The experimental results indicate that the flexural capacity and stiffness of the strengthened beam are evidently improved.Based on the experiment, the flexural performance, failure mode and mechanism are evaluated. The formulas for calculating the flexural capacity and stiffness are suggested, and the former can be used to design member that are needed to be strengthened in the actual application. Moreover, reliable anchoring method on steel strand and construction method for strengthening are presented.
钢绞线防腐砂浆加固混凝土构件是一种新型的加固方法。相对于其他的加固方法,防腐砂浆为无机材料,耐久性和耐火性好,并且试验中采用了镀锌钢绞线,它强度高,耐锈蚀性能也较好,加固施工简便,加固后对建筑外观影响很小,所以此加固技术具有比较广阔的应用前景。
本文从工程实际应用的角度,对采用钢绞线防腐砂浆加固后的钢筋混凝土梁进行了试验研究。共试验了8根梁,其中2根为未加固的对比试验梁,6根为用钢绞线防腐砂浆加固的试验梁。试验结果表明,加固梁的承载力和刚度提高明显。
最后在试验的基础上,研究了加固梁的抗弯受力性能和破坏形态及破坏机理,给出了加固梁的刚度计算公式和可用于实际工程设计的承载力计算公式,同时提出了可靠的钢绞线锚固方法以及加固施工方法。
With the development of economy, the focus of buildings will gradually shift from largely constructing new buildings to repairing and reforming of existing buildings. According to statistics, reforming can saves investment by 40% and cuts construction time by 50% and recoups capital outlay two or three times faster than building new ones. Moreover, many new buildings are damaged to different extents by numerous natural disasters, and cannot be put into normal use. Besides, social development has left many buildings outdated and unfit in function and use. Lastly, the aging of buildings is an irresistible problem. All these have made strengthening and reforming of buildings increasingly important and urgent. How to take effective strengthening measures to recover the functions of damaged buildings is an urgent project for all structural engineers, which is also original intention for the present research.The method that steel reinforced concrete member is strengthened with steel strand and anticorrosive mortar is a new strengthening method. Compared with other strengthening methods, since the anticorrosive mortar is a kind of inorganic material with durability and fire-resisting property, and the galvanized steel strand with high strength used in this experiment is hard to be rusted, the method is easy to construct, and after strengthening a building its figure is hardly altered, so these characteristic endow them with a prosperous prospect.Based on the actual application in a project, this thesis aims at the experimental investigation on the performance of steel reinforced concrete beam strengthened with steel strand and anticorrosive mortar, In the experiment eight beams are investigated, two of which were reference beams that is not strengthened, six of which are beams strengthened with steel strand and anticorrosive mortar.The experimental results indicate that the flexural capacity and stiffness of the strengthened beam are evidently improved.Based on the experiment, the flexural performance, failure mode and mechanism are evaluated. The formulas for calculating the flexural capacity and stiffness are suggested, and the former can be used to design member that are needed to be strengthened in the actual application. Moreover, reliable anchoring method on steel strand and construction method for strengthening are presented.
引文
[1] 建筑事故防范与处理课题组.建筑事故防范与处理实用全书.中国建材工业出版社,1998
[2] 罗福午.建筑工程质量缺陷事故分析及处理.武汉工业大学出版社,1999.8
[3] 王赫等.建筑工程事故处理手册.中国建筑工业出版社,1994
[4] 中国建筑业联合会质量委员会.建筑工程倒塌实例分析.北京:中国建筑工业出版社,1988
[5] 蒋元驯,韩素芳.混凝土工程病害与修补加固.北京:海洋出版社,1996
[6] 彭圣洁.建筑工程质量通病防治手册.北京:中国建筑工业出版社,1984
[7] 吴英键等.建筑特抗震加固.长春出版社,1991
[8] 吕西林等.房屋结构抗震设计理论与实例.同济大学出版社,1995.1
[9] 编写组.建筑抗震加固技术规程.中国建筑科学研究院,1998
[10] 唐业清,万墨林。建筑物改造与病害处理中国建筑工业出版社,2000.10
[11] 编写组,房屋修缮标准与法规选编.中国建筑工业出版社,1993
[12] 工业与民用建筑抗震加固技术措施编写组.工业与民用建筑抗震加固技术措施.北京:地震出版社,1987
[13] 董吉士等.房屋维修加固手册.北京:中国建筑工业出版社,1988
[14] 黄可信,吴兴祖.钢筋混凝土结构中钢筋腐蚀与保护。北京:中国建筑工业出版社,1983
[15] 唐业清.关于旧有房屋增层改造工程的几个问题.建筑技术,1992,(3):118-121
[16] 汪恒在.房屋增层设计中存在的问题及改进措施.建筑技术,1992,(3):127-128
[17] Allen RTL. Enwards S. C. The repair of Concrete Structures, Balckie Glasgow and Iondon, 1987
[18] GangaRao H V S. Vijay P V. Bending behavior of concrete beams wrapped with carbon fabric. Journal of Structural Engineering. 1998(1).
[19] 欧阳煌,黄架辉.粘钢加固RC梁的锚固剪应力参数分析.华侨大学学报,2000,21(3):282-286
[20] Varastehpour H, Hamelin P. Strengthening of concrete beams using fiber-reinforced plastics. Materials and Structures 1997;30:160-6.
[21] 卫龙武,吕志涛.预应力加固工艺及计算.工业建筑,1991,(3):22-27
[22] 王孔藩,庄文华,高铧.建筑结构加固新技术—粘钢加固法。施工技术,1994,(7):25-27
[23] J. G. Teng, J. F. Chen, S. T. Smith, L. Lam, FRP-strengthened RC Struc-tures, John Wiley&Sons, Ltd. 2002
[24] 岳清端,陈小兵,牟宏远.碳纤维材料加固修补混凝土结构新技术.纤维混凝土技术简讯.1991,(36):1-4
[25] 金成勋,金成秀等.Performance Evaluation of Permeability Polymer Mortar(RC-A0401).
[26] 金成勋,金明关等.The Evaluation on Ductility of RC Slab Structure Reinforced by Stainless Steel Wire Mesh.
[27] 金成勋.不锈钢绞线抗拉强度试验结果.
[28] 金成勋,金成秀等.渗透性聚合物砂浆(RC-A0401)的性能分析.
[30] 中华人民共和国建设部.混凝土结构设计规范GB 50010-2002.北京:建筑工业出版社,2002
[31] 同济大学混凝土结构教研室.混凝土结构基本原理.北京,建筑工业出版社,2000.8,75
[32] 同济大学混凝土结构教研室.混凝土结构基本原理.北京,建筑工业出版社,2000.8,78
[33] 过镇海.钢筋混凝土原理.北京,建筑工业出版社,1999.3,135
[34] 戴宝昌.国内外线材及相关标准汇编.冶金部金属制品研究院,1998
[35] 买淑芳.混凝土聚合物复合材料及其应用[M].北京:科学技术文献出版社,1996.12.
[36] 刘卫东.丙乳砂浆的水工特性试验研究与工程应用.水利学报.2002.6
[37] 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.S-9
[38] 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
[39] 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
[40] 胡新舒,聂建国,张天申.高强钢绞线加固钢筋混凝土梁抗弯疲劳性能的试验研究.[硕士学位论文].北京:清华大学土木工程系,2004.6
[41] 李建民.北京三元桥主体结构的加固方法.市政技术,2005年04期
[42] 曹忠民,李爱群,王亚勇等.高强钢绞线网-聚合物砂浆复合面层加固震损梁柱节点的试验研究.工程抗震与加固改造,2005年06期
[43] 姚秋来,王忠海,王亚勇等.高强钢绞线网片—聚合物砂浆复合面层加固技术—新型“绿色”加固技术.工程质量,2005年12期
[44] 王亚勇,姚秋来,巩正光等.高强钢绞线网-聚合物砂浆在郑成功纪念馆加固工程中的应用.建筑结构,2005年08期
[2] 罗福午.建筑工程质量缺陷事故分析及处理.武汉工业大学出版社,1999.8
[3] 王赫等.建筑工程事故处理手册.中国建筑工业出版社,1994
[4] 中国建筑业联合会质量委员会.建筑工程倒塌实例分析.北京:中国建筑工业出版社,1988
[5] 蒋元驯,韩素芳.混凝土工程病害与修补加固.北京:海洋出版社,1996
[6] 彭圣洁.建筑工程质量通病防治手册.北京:中国建筑工业出版社,1984
[7] 吴英键等.建筑特抗震加固.长春出版社,1991
[8] 吕西林等.房屋结构抗震设计理论与实例.同济大学出版社,1995.1
[9] 编写组.建筑抗震加固技术规程.中国建筑科学研究院,1998
[10] 唐业清,万墨林。建筑物改造与病害处理中国建筑工业出版社,2000.10
[11] 编写组,房屋修缮标准与法规选编.中国建筑工业出版社,1993
[12] 工业与民用建筑抗震加固技术措施编写组.工业与民用建筑抗震加固技术措施.北京:地震出版社,1987
[13] 董吉士等.房屋维修加固手册.北京:中国建筑工业出版社,1988
[14] 黄可信,吴兴祖.钢筋混凝土结构中钢筋腐蚀与保护。北京:中国建筑工业出版社,1983
[15] 唐业清.关于旧有房屋增层改造工程的几个问题.建筑技术,1992,(3):118-121
[16] 汪恒在.房屋增层设计中存在的问题及改进措施.建筑技术,1992,(3):127-128
[17] Allen RTL. Enwards S. C. The repair of Concrete Structures, Balckie Glasgow and Iondon, 1987
[18] GangaRao H V S. Vijay P V. Bending behavior of concrete beams wrapped with carbon fabric. Journal of Structural Engineering. 1998(1).
[19] 欧阳煌,黄架辉.粘钢加固RC梁的锚固剪应力参数分析.华侨大学学报,2000,21(3):282-286
[20] Varastehpour H, Hamelin P. Strengthening of concrete beams using fiber-reinforced plastics. Materials and Structures 1997;30:160-6.
[21] 卫龙武,吕志涛.预应力加固工艺及计算.工业建筑,1991,(3):22-27
[22] 王孔藩,庄文华,高铧.建筑结构加固新技术—粘钢加固法。施工技术,1994,(7):25-27
[23] J. G. Teng, J. F. Chen, S. T. Smith, L. Lam, FRP-strengthened RC Struc-tures, John Wiley&Sons, Ltd. 2002
[24] 岳清端,陈小兵,牟宏远.碳纤维材料加固修补混凝土结构新技术.纤维混凝土技术简讯.1991,(36):1-4
[25] 金成勋,金成秀等.Performance Evaluation of Permeability Polymer Mortar(RC-A0401).
[26] 金成勋,金明关等.The Evaluation on Ductility of RC Slab Structure Reinforced by Stainless Steel Wire Mesh.
[27] 金成勋.不锈钢绞线抗拉强度试验结果.
[28] 金成勋,金成秀等.渗透性聚合物砂浆(RC-A0401)的性能分析.
[30] 中华人民共和国建设部.混凝土结构设计规范GB 50010-2002.北京:建筑工业出版社,2002
[31] 同济大学混凝土结构教研室.混凝土结构基本原理.北京,建筑工业出版社,2000.8,75
[32] 同济大学混凝土结构教研室.混凝土结构基本原理.北京,建筑工业出版社,2000.8,78
[33] 过镇海.钢筋混凝土原理.北京,建筑工业出版社,1999.3,135
[34] 戴宝昌.国内外线材及相关标准汇编.冶金部金属制品研究院,1998
[35] 买淑芳.混凝土聚合物复合材料及其应用[M].北京:科学技术文献出版社,1996.12.
[36] 刘卫东.丙乳砂浆的水工特性试验研究与工程应用.水利学报.2002.6
[37] 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.S-9
[38] 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
[39] 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
[40] 胡新舒,聂建国,张天申.高强钢绞线加固钢筋混凝土梁抗弯疲劳性能的试验研究.[硕士学位论文].北京:清华大学土木工程系,2004.6
[41] 李建民.北京三元桥主体结构的加固方法.市政技术,2005年04期
[42] 曹忠民,李爱群,王亚勇等.高强钢绞线网-聚合物砂浆复合面层加固震损梁柱节点的试验研究.工程抗震与加固改造,2005年06期
[43] 姚秋来,王忠海,王亚勇等.高强钢绞线网片—聚合物砂浆复合面层加固技术—新型“绿色”加固技术.工程质量,2005年12期
[44] 王亚勇,姚秋来,巩正光等.高强钢绞线网-聚合物砂浆在郑成功纪念馆加固工程中的应用.建筑结构,2005年08期