钢筋网水泥砂浆加固旧砖墙的试验研究
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摘要
经过长时间使用后,砖砌体易发生由于砖风化、砂浆粉化、墙体裂缝和底层受潮等导致的砖砌体承载力下降、安全性降低,需采取合理的维修加固措施。已有研究表明,钢筋网水泥砂浆是一种砖墙抗震加固的有效方法。通过8片旧墙体的对比试验,研究钢筋网水泥砂浆加固旧砖墙受压承载力和水平承载力的效果,研究参数包括水泥砂浆层数、掏缝置换等。研究结果表明,采用双侧钢筋网水泥砂浆加固后旧砖墙的受压承载力提高121%～134%,而仅采用单侧钢筋网水泥砂浆加固旧砖墙的受压承载力没有明显改善。采用双侧钢筋网水泥砂浆加固后旧砖墙的水平承载力大幅提高,提高幅度达250%～612%,同时加固旧墙体的耗能能力明显提高。对原灰缝进行30mm深掏缝置换可对砖墙的加固效果略有提高。
Most of the historic buildings in China are masonry. After long-time usage, many of them are in degradation and need to be strengthened. Steel-meshed cement mortar is an effective means for seismic strengthening of masonry walls. Atotal of8 old brick masonry walls strengthened with steel-meshed cement mortar were experimentally studied, in which five specimens were strengthened for the purpose of improving their vertical compressive strength, and the other three were strengthened in order to improve their seismic strength. Test results indicate that the vertical compressive strength of the old masonry walls strengthened with double-faced steel-meshed cement mortar has a 121% ～134% increase, whereas the old masonry walls strengthened with single-faced steel-meshed cement mortar has no obvious increase. The horizontal bearing capacity of the old masonry walls strengthened with double-faced steel-meshed cement mortar has a 250% ～612% increase, and the increase in the energy dissipation capacity is also significant. Replacing the original low-strength mortar of the old masonry wall with high-strength cement mortar for a depth of 30mm would slightly increase the strengthening performance.
Most of the historic buildings in China are masonry. After long-time usage, many of them are in degradation and need to be strengthened. Steel-meshed cement mortar is an effective means for seismic strengthening of masonry walls. Atotal of8 old brick masonry walls strengthened with steel-meshed cement mortar were experimentally studied, in which five specimens were strengthened for the purpose of improving their vertical compressive strength, and the other three were strengthened in order to improve their seismic strength. Test results indicate that the vertical compressive strength of the old masonry walls strengthened with double-faced steel-meshed cement mortar has a 121% ～134% increase, whereas the old masonry walls strengthened with single-faced steel-meshed cement mortar has no obvious increase. The horizontal bearing capacity of the old masonry walls strengthened with double-faced steel-meshed cement mortar has a 250% ～612% increase, and the increase in the energy dissipation capacity is also significant. Replacing the original low-strength mortar of the old masonry wall with high-strength cement mortar for a depth of 30mm would slightly increase the strengthening performance.
引文
[1]朱伯龙,吴明舜,蒋志贤.砖墙用钢筋网水泥砂浆面层加固的抗震能力研究[J].地震工程与工程振动,1984,4(1):70-81(Zhu Bolong,Wu Mingshun,Jiang Zhixian.Astudy on aseismic capacity of brick wall strengthened with cement mortar reinforced with steel mesh[J].Earthquake Engineering and Engineering Vibration,1984,4(1):70-81(in Chinese))
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[3]黄忠邦.水泥砂浆及钢筋网水泥砂浆面层加固砖砌体试验[J].天津大学学报,1994,27(6):764-770(Huang Zhongbang.The study on adopting the cover with cement mortar and the cover with reinforced cement mortar to strengthen brick masonry[J].Journal of TianjinUniversity,1994,27(6):764-770(in Chinese))
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[5]谈永奎.砖墙体加固抗震性能的试验比较[J].工业建筑,2001,31(7):65-67(Tan Yongkui.The comparison with the anti-seismic property of consolidated walled[J].Industrial Construction,2001,31(7):65-67(in Chinese))
[6]王天贤.加固再役KP1砖墙的抗震性能试验研究[J].重庆建筑大学学报,2003,25(3):51-54(Wang Tianxian.Investigation on seismic behavior of KP1masonry wall strengthened[J].Journal of Chongqing Jianzhu University,2003,25(3):51-54(in Chinese))
[7]李明,王志浩.钢筋网水泥砂浆加固低强度砂浆砖砌体的试验研究[J].建筑结构,2003,33(10):34-36(Li Ming,Wang Zhihao.Experimental research on masonry wall with low-strength mortar strengthened with steel-mesh cement mortar[J].Building Structures,2003,33(10):34-36(in Chinese))
[8]JGJ116—98建筑抗震加固技术规程[S](JGJ116—98Technical specification for seismic strengthening of building[S](in Chinese))
[9]张代涛,宋菊芳.钢筋网水泥砂浆加固砖砌体房屋振动台试验研究[J].工程抗震,1996,(3):32-36(Zhang Daitao,Song Jufang.Shaking table test of masonry building strengthened with steel-mesh cement mortar[J].Earthquake Resistant Engineering,1996,(3):32-36(in Chinese))
[10]苏三庆,丰定国.用夹板墙加固砖房的抗震性能[J].西安建筑科技大学学报,1998,30(3):233-235(Su Sanqing,Feng Dingguo.Aseiemic behavior of brick masonry building strengthened with steel-meshed cement mortar[J].Journal of Xi’an University of Architecture and Technology,1998,30(3):233-235(in Chinese))
[11]黄忠邦.钢筋网水泥砂浆加固砖墙中关于拉结筋的试验研究[J].实验力学,1994,9(4):383-359(Huang Zhongbang.Testing study of tie-bars in brick wall strengthened with bar-mat reinforced cement mortar[J].Journal of Experimental Mechanics,1994,9(4):383-359(in Chinese))
[2]楼永林.夹板墙的试验研究与加固设计[J].建筑结构学报,1988,9(4):1-12(Lou Yonglin.Research and design of strengthening brick wall by cement or reinforced cement mortar coatings[J].Journal of Building Structures,1988,9(4):1-12(in Chinese))
[3]黄忠邦.水泥砂浆及钢筋网水泥砂浆面层加固砖砌体试验[J].天津大学学报,1994,27(6):764-770(Huang Zhongbang.The study on adopting the cover with cement mortar and the cover with reinforced cement mortar to strengthen brick masonry[J].Journal of TianjinUniversity,1994,27(6):764-770(in Chinese))
[4]苏三庆,丰定国,王清敏.用钢筋网水泥抹面加固砖墙的抗震性能试验研究[J].西安建筑科技大学学报,1998,30(3):228-232(Su Sanqing,Feng Dingguo,Wang Qingmin.An investigation on aseismic behavior of masonry wall strengthened with steel-meshed cement mortar[J].Journal of Xi′an University of Architecture and Technology,1998,30(3):228-232(in Chinese))
[5]谈永奎.砖墙体加固抗震性能的试验比较[J].工业建筑,2001,31(7):65-67(Tan Yongkui.The comparison with the anti-seismic property of consolidated walled[J].Industrial Construction,2001,31(7):65-67(in Chinese))
[6]王天贤.加固再役KP1砖墙的抗震性能试验研究[J].重庆建筑大学学报,2003,25(3):51-54(Wang Tianxian.Investigation on seismic behavior of KP1masonry wall strengthened[J].Journal of Chongqing Jianzhu University,2003,25(3):51-54(in Chinese))
[7]李明,王志浩.钢筋网水泥砂浆加固低强度砂浆砖砌体的试验研究[J].建筑结构,2003,33(10):34-36(Li Ming,Wang Zhihao.Experimental research on masonry wall with low-strength mortar strengthened with steel-mesh cement mortar[J].Building Structures,2003,33(10):34-36(in Chinese))
[8]JGJ116—98建筑抗震加固技术规程[S](JGJ116—98Technical specification for seismic strengthening of building[S](in Chinese))
[9]张代涛,宋菊芳.钢筋网水泥砂浆加固砖砌体房屋振动台试验研究[J].工程抗震,1996,(3):32-36(Zhang Daitao,Song Jufang.Shaking table test of masonry building strengthened with steel-mesh cement mortar[J].Earthquake Resistant Engineering,1996,(3):32-36(in Chinese))
[10]苏三庆,丰定国.用夹板墙加固砖房的抗震性能[J].西安建筑科技大学学报,1998,30(3):233-235(Su Sanqing,Feng Dingguo.Aseiemic behavior of brick masonry building strengthened with steel-meshed cement mortar[J].Journal of Xi’an University of Architecture and Technology,1998,30(3):233-235(in Chinese))
[11]黄忠邦.钢筋网水泥砂浆加固砖墙中关于拉结筋的试验研究[J].实验力学,1994,9(4):383-359(Huang Zhongbang.Testing study of tie-bars in brick wall strengthened with bar-mat reinforced cement mortar[J].Journal of Experimental Mechanics,1994,9(4):383-359(in Chinese))
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