HPFL条带加固眠墙抗压及抗震性能试验研究
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摘要
普通砖砌眠墙是我国的一种传统墙体,目前我国广大村镇地区仍然在大量使用普通粘土砖砌体结构房屋。由于建造和使用时的各种原因,砖砌结构房屋,尤其是在广大农村地区的砖墙房屋,往往存在砌筑砂浆强度很低、砌筑质量差的情况。过低强度的砌筑砂浆会直接影响砖砌墙体的抗压及抗剪强度,从而影响砌体结构的承载能力。在历次地震中,农村地区砌体结构房屋破坏最为严重。因此,研究砖砌墙体的抗压、抗震性能和加固方法具有十分重要的意义。
高性能复合砂浆钢筋网(HPFL)加固法是一种新型适用的加固方法,此方法已经大量应用于混凝土结构的加固工程,相关研究工作也比较成熟。HPFL是否适用于砌体结构的加固,相关研究还比较缺乏,因此本文通过对高性能复合砂浆钢筋网加固砖砌体结构的抗压和抗震性能试验研究,得出应用高性能复合砂浆钢筋网加固砖砌体结构的有效措施和方法。本文对HPFL条带加固砖砌体的抗压、抗震试验研究主要内容有以下几个方面:
1.共制作了4组HPFL加固的普通砖砌体抗压试件及1组对比试件,采用分级加载的方法进行抗压强度试验研究,比较分析不同加固面数和砂浆面层厚度等参数对加固砖墙的承载力、延性和破坏形态的影响并得出HPFL加固砖墙抗压强度的建议计算公式。实验研究结果表明:原砖墙与高性能复合砂浆钢筋网面层能较好的协同工作,HPFL能显著地提高砖墙的抗压承载力,砖墙延性得到改善。
2.通过对4片HPFL加固的砖砌眠墙和1片未加固砖墙试件的水平低周反复荷载试验,研究分析了不同加固方式的抗震性能指标,同时对比分析了加固前后试件的破坏过程、破坏形态以及墙体的各项抗震性能指标,包括墙片的抗震抗剪承载力、骨架曲线、滞回曲线、刚度和刚度退化曲线、延性性能、变形性能等特性。试验结果表明,高性能复合砂浆钢筋网条带加固法能显著提高砖砌眠墙的抗剪承载力,是一种有效的加固方法。本文在试验的基础上,根据以往的砖砌体抗剪强度理论,对HPFL加固眠墙抗剪承载力计算方法进行了研究,提出了HPFL加固砖砌眠墙抗剪承载力的计算公式,以供加固设计时参考。
Common brick solid wall is a traditional wall in China. Currently a great number of houses built of bricks can be widely seen in towns and villages. However, because of various reasons during construction and housing, those houses in brick masonry, especially houses in the vast rural areas, often have problems of low strength in masonry mortar and low quality in masonry which will directly affect the compression strength and shear strength of the brickwork, sequentially the bearing capacity of masonry structure. During previous earthquakes, houses in masonry structure in rural areas are the most severely destroyed buildings. Therefore, the study on the compression strength and shear strength of the brickwork and its reinforcement methods is of great significance.
The new High Performance Ferrocement Laminate(HPFL) reinforcement method has been widely used in the reinforcement of concrete stucture and the relevant researches are in a mature stage. However, there are scanty researches on whether HPFL could also be applied to the reinforcement of masonry structure. Therefore, through experiments and analysis on the compression strength and shear strength of brick masonry structure after HPFL reinforcement, this thesis finds out some effective methodes and measures of HPFL reinforcement on brick masonry structure. The main experiment and analysis are conducted as follows:
1. Prepare 4 groups of compressive specimen reinforced by HPFL and 1 group of contrasting specimen, adopt stage loading method for experimental study on compression strength, conduct comparative analysis on effects of different parameters like reinforcement layer numbers and mortar coating thickness on the bearing capacity, ductility and failure pattern of reinforced brick walls and suggest the calculation formula of compression strength of HPFL reinforced brick wall. The experimental result shows that the original brick wall can collaborate well with HPFL coating and HPFL can help improve significantly the compression strength, bearing capacity and ductility of the brick wall.
2. Through the cyclic loading test on 4 HPFL reinforced brick solid walls and 1 brick wall specimen without reinforcement, analyze the seismic performance index of different reinforcement methods and present comparative analysis on the failure process, failure pattern and wall’s various seismic performance indexes before and after the reinforcement, including wall’s seismic capacity and shear strength, hysterrisis curve, skeleton curve, stiffness and stiffness degradation curve, ductility performance, deformation behavior and other features. The experimental result indicates that HPFL reinforcement method is quite effective for greatly improving the shear strength of brick solid wall. On the basis of the experiments and previous researches on shear strength of brick masonry, this thesis studies the calculation formula of shear capacity of HPFL reinforced brick masonry and suggests the calculation formula of shear capacity of HPFL reinforced brick solid wall for reference to reinforcement design.
高性能复合砂浆钢筋网(HPFL)加固法是一种新型适用的加固方法,此方法已经大量应用于混凝土结构的加固工程,相关研究工作也比较成熟。HPFL是否适用于砌体结构的加固,相关研究还比较缺乏,因此本文通过对高性能复合砂浆钢筋网加固砖砌体结构的抗压和抗震性能试验研究,得出应用高性能复合砂浆钢筋网加固砖砌体结构的有效措施和方法。本文对HPFL条带加固砖砌体的抗压、抗震试验研究主要内容有以下几个方面:
1.共制作了4组HPFL加固的普通砖砌体抗压试件及1组对比试件,采用分级加载的方法进行抗压强度试验研究,比较分析不同加固面数和砂浆面层厚度等参数对加固砖墙的承载力、延性和破坏形态的影响并得出HPFL加固砖墙抗压强度的建议计算公式。实验研究结果表明:原砖墙与高性能复合砂浆钢筋网面层能较好的协同工作,HPFL能显著地提高砖墙的抗压承载力,砖墙延性得到改善。
2.通过对4片HPFL加固的砖砌眠墙和1片未加固砖墙试件的水平低周反复荷载试验,研究分析了不同加固方式的抗震性能指标,同时对比分析了加固前后试件的破坏过程、破坏形态以及墙体的各项抗震性能指标,包括墙片的抗震抗剪承载力、骨架曲线、滞回曲线、刚度和刚度退化曲线、延性性能、变形性能等特性。试验结果表明,高性能复合砂浆钢筋网条带加固法能显著提高砖砌眠墙的抗剪承载力,是一种有效的加固方法。本文在试验的基础上,根据以往的砖砌体抗剪强度理论,对HPFL加固眠墙抗剪承载力计算方法进行了研究,提出了HPFL加固砖砌眠墙抗剪承载力的计算公式,以供加固设计时参考。
Common brick solid wall is a traditional wall in China. Currently a great number of houses built of bricks can be widely seen in towns and villages. However, because of various reasons during construction and housing, those houses in brick masonry, especially houses in the vast rural areas, often have problems of low strength in masonry mortar and low quality in masonry which will directly affect the compression strength and shear strength of the brickwork, sequentially the bearing capacity of masonry structure. During previous earthquakes, houses in masonry structure in rural areas are the most severely destroyed buildings. Therefore, the study on the compression strength and shear strength of the brickwork and its reinforcement methods is of great significance.
The new High Performance Ferrocement Laminate(HPFL) reinforcement method has been widely used in the reinforcement of concrete stucture and the relevant researches are in a mature stage. However, there are scanty researches on whether HPFL could also be applied to the reinforcement of masonry structure. Therefore, through experiments and analysis on the compression strength and shear strength of brick masonry structure after HPFL reinforcement, this thesis finds out some effective methodes and measures of HPFL reinforcement on brick masonry structure. The main experiment and analysis are conducted as follows:
1. Prepare 4 groups of compressive specimen reinforced by HPFL and 1 group of contrasting specimen, adopt stage loading method for experimental study on compression strength, conduct comparative analysis on effects of different parameters like reinforcement layer numbers and mortar coating thickness on the bearing capacity, ductility and failure pattern of reinforced brick walls and suggest the calculation formula of compression strength of HPFL reinforced brick wall. The experimental result shows that the original brick wall can collaborate well with HPFL coating and HPFL can help improve significantly the compression strength, bearing capacity and ductility of the brick wall.
2. Through the cyclic loading test on 4 HPFL reinforced brick solid walls and 1 brick wall specimen without reinforcement, analyze the seismic performance index of different reinforcement methods and present comparative analysis on the failure process, failure pattern and wall’s various seismic performance indexes before and after the reinforcement, including wall’s seismic capacity and shear strength, hysterrisis curve, skeleton curve, stiffness and stiffness degradation curve, ductility performance, deformation behavior and other features. The experimental result indicates that HPFL reinforcement method is quite effective for greatly improving the shear strength of brick solid wall. On the basis of the experiments and previous researches on shear strength of brick masonry, this thesis studies the calculation formula of shear capacity of HPFL reinforced brick masonry and suggests the calculation formula of shear capacity of HPFL reinforced brick solid wall for reference to reinforcement design.
引文
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[2]施楚贤.砌体结构理论与设计,北京:中国建筑工业出版社,1992,59-61
[3]朱伯龙.砌体结构设计原理.同济大学出版社,1991,55-58
[4]骆万康,王天贤.预应力砖墙在低周反复荷载下抗裂及承载力试验研究.重庆建筑工程学院学报,1994,16(4):52-66
[5]施楚贤.设置砼构造柱砖砌体结构受压承载力计算.建筑结构,1996,26(3): 13-16
[6]施楚贤,梁建国.设置砼构造柱的网状配筋砖墙的抗震性能.建筑结构,1996,26(9):9-14
[7] M.Taghdi. Seismic Retrofitting of Low-Rise Masonry and Concrete Walls using Steel Strips.Journal of Structural Engineering,2000,126(9):1017-1025
[8]朱伯龙、蒋志贤、吴明舜.外加钢筋混凝土柱提高砖混房屋抗震能力的研究.同济大学学报,1983,(1):31-43
[9]田世民.空斗墙加固技术的理论研究和试验分析及其基础纠偏分析:[浙江大学硕士学位论文].杭州:浙江大学,1999,31(5):17-23
[10]赵彤、张晨军、谢剑.碳纤维布用于砖砌体抗震加固的试验研究.地震工程与工程振动,2001,21(2):89-95
[11]张祥顺,吴辉琴,彭少民.CFRP对无构造柱墙体抗震加固试验研究[J].华中科技大学学报,2002,19(3):13-16
[12]卢会芳,谷倩,孙成访等.碳纤维布加固带窗洞砖墙抗震性能试验研究[J].武汉理工大学学报,2005,27(2)
[13]翁大根,吕西林,任晓崧等.砖砌体墙片抗震修复与加同伪静力试验[J].世界地震工程,2003,19(1):1-8
[14]王全凤,柴振岭,黄奕辉,杨勇新等.GFRP复合材料加固带壁柱砖墙抗震性能试验研究明.土木工程学报,2006,39(8):65-71
[15]王亚勇,姚秋来,王忠海等.高强钢绞线网.聚合物砂浆复合面层加固砖墙的试验研究[J].建筑结构,2005,35(8):65-70
[16]吕西林《建筑结构加固设计》,科学出版社,2001,23-27
[17] Romualdi. Ferrocement for Infrastructure Rehabilitation. Concrete International: Design and Construction, 1987, 9(9): 24-28
[18] Irons.Laminated for Better repair.Concrete International:Design and Construction, 1987, 9(9):34-38
[19] Sharma. Tests of Reinforced Concrete Continuous Beams with and without Ferrocement. Concrete International, 1992, 14(3): 36-40
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