酸雨腐蚀砖砌体组合墙抗震性能试验及恢复力研究
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摘要
为研究酸雨环境下砖砌体组合墙的抗震性能,以6片砖砌体组合墙作为研究对象,首先对人工模拟酸雨环境进行加速腐蚀,进而对其进行低周反复加载试验,考察腐蚀砖砌体组合墙的破坏过程与变形特征,研究不同酸雨腐蚀循环次数对荷载-位移滞回曲线、骨架曲线、承载力衰减、刚度退化、耗能能力等抗震性能指标的影响。并通过引入基于耗能的循环退化指数对墙体的力学性能退化规律进行描述,建立了腐蚀墙体的恢复力模型,给出了具体的滞回规则。研究结果表明:随着酸雨腐蚀循环次数的增加,试件的承载力、刚度、耗能逐渐降低,承载力和刚度的衰减速率逐渐加快;所建立的恢复力模型能够较好描述酸雨环境下砖砌体组合墙在反复荷载作用下的滞回特性,可为在役酸雨环境下砌体结构的承载力分析提供参考。
In order to study the seismic behaviors of composite walls made of reinforced concrete and brick masonry in acidic atmospheric environment,quasi-static tests of six composite walls corroded by artificial climate accelerated corrosion tests were carried out.The damage process and deformation characterestics were obtained,and the influence of different corrosion cycles on aseismic indexes such as displacement-load hysteretic curve,skeleton curve,strength degradation,stiffness degradation and energy dissipating capacity were studied.The cycle degradation indices based on energy dissipation were proposed,which were used to describe the detailed degradation law of mechanical properties of specimens.After that,the restoring force model of brick composite walls was established and the specific hysteretic rule was given.The results show that the bearing capacity,initial stiffness and energy dissipation capacity of the specimen decrease gradually with the increase of the number of corrosion cycles,and the degradation rates of the bearing capacity and the stiffness increase gradually.The proposed restoring force model can reflect the hysteretic characteristics of brick composite walls under reversed loading in acidic atmospheric environment.Results from the present study will provide a reference for the bearing capacity analysis of existing masonry structures under acidic atmosphere environment.
In order to study the seismic behaviors of composite walls made of reinforced concrete and brick masonry in acidic atmospheric environment,quasi-static tests of six composite walls corroded by artificial climate accelerated corrosion tests were carried out.The damage process and deformation characterestics were obtained,and the influence of different corrosion cycles on aseismic indexes such as displacement-load hysteretic curve,skeleton curve,strength degradation,stiffness degradation and energy dissipating capacity were studied.The cycle degradation indices based on energy dissipation were proposed,which were used to describe the detailed degradation law of mechanical properties of specimens.After that,the restoring force model of brick composite walls was established and the specific hysteretic rule was given.The results show that the bearing capacity,initial stiffness and energy dissipation capacity of the specimen decrease gradually with the increase of the number of corrosion cycles,and the degradation rates of the bearing capacity and the stiffness increase gradually.The proposed restoring force model can reflect the hysteretic characteristics of brick composite walls under reversed loading in acidic atmospheric environment.Results from the present study will provide a reference for the bearing capacity analysis of existing masonry structures under acidic atmosphere environment.
引文
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[18]顾祥林,陈贡联,马俊元,等.反复荷载作用下混凝土多孔砖墙体受力性能试验研究[J].建筑结构学报,2010,31(12):123-131.(GU Xianglin,CHENGonglian,MA Junyuan,et al.Experimental study on mechanical behavior of concrete perforated brick walls under cyclic loading[J].Journal of Building Structures,2010,31(12):123-131.(in Chinese))
[2]苑振芳,刘斌,苑磊.砌体结构的耐久性[J].建筑结构,2011,41(4):117-122.(YUAN Zhenfang,LIUBin,YUAN Lei.Durability of massory structures[J].Building Structure,2011,41(4):117-122.(in Chinese))
[3]MANSO J M,RODRIGUEZ A,ARAGON A,GONZALEZ J J.The durability of masonry mortars made with ladle furnace slag[J].Construction and Building Materials,2011,25(8):3508-3519.
[4]LANAS J,SIRERA R,ALVAREZ J I.Study of the mechanical behavior of masonry repair lime-based mortars cured and exposed under different conditions[J].Cement and Concrete Research,2006,36(5):961-970.
[5]EYSSAUTIER C S,MARINET B,THOMACHOT S C,et al.Simulation of acid rain weathering effect on natural and artificial carbonate stones[J].Environmental Earth Sciences,2016,75(9):748-758.
[6]王国业,程镇,佟舟,等.酸雨对建筑砂浆性能的影响[J].沈阳建筑大学学报(自然科学版),2016,32(4):658-665.(WANG Guoye,CHENG Zhen,TONGZhou,et al.The influence of acid rain on the performance of building mortar[J].Journal of Shenyang Jianzhu University(Natural Science),2016,32(4):658-665.(in Chinese))
[7]GENTILINI Cristina,FRANZONI Elisa,BANDINISimine,NOBILE Lucio.Effect of salt crystallization on the shear behavior of masonry walls:an experimental study[J].Construction and Building Materials,2012,37(3):181-189.
[8]BOCCAL Pietro,GRAZZINI Alessandro.Mechanical properties and freeze-thaw durability of strengthening mortars[J].Journal of Materials in Civil Engineering,2013,25(2):274-280.
[9]郑山锁,牛丽华,程明超,孙龙飞.冻融环境下砖砌体组合墙的抗震性能试验[J].振动与冲击,2017,36(17):157-164.(ZHENG Shansuo,NIU Lihua,CHENG Mingchao,SUN Longfei.Tests for aseismic performances of composite walls under freeze-thaw environment[J].Journal of Vibration and Shock,2017,36(17):157-164.(in Chinese))
[10]KANAZU T,MATSUMURA T,NISHIUCHI T,et al.Effect of simulated acid rain on deterioration of concrete[J].Water,Air,and Soil Pollute,2001,130(4):1481-1486.
[11]张英姿,赵颖华,范颖芳.受酸雨腐蚀混凝土弹性模量研究[J].工程力学,2011,28(2):175-180.(ZHANG Yingzi,ZHAO Yinghua,FAN Yingfang.Atheoretical for assessing elastic modulus of concrete corroded by acid rain[J].Engineering Mechanics,2011,28(2):175-180.(in Chinese))
[12]范颖芳,王大为,栾海洋.模拟酸沉降环境混凝土梁承载力性能研究[J].工程力学,2014,31(4):147-154.(FAN Yingfang,WANG Dawei,LUAN Haiyang.Study on the load capacity of reinforced concrete beams under acid precipitation[J].Engineering Mechanics,2014,31(1):147-154.(in Chinese))
[13]胡晓波.酸雨侵蚀混凝土的试验模拟分析[J].硅酸盐学报,2008,36(增刊1):147-152.(HU Xiaobo.Analysis for simulation test on acid rain attaceking concrete[J].Journal of the Chinese Ceramic Society,2008,36(Suppl.1):147-152.(in Chinese))
[14]建筑抗震试验规程:JGJ/T 101-2015[S].北京:中国建筑工业出版社,2015.(Specification for seismic test of buildings:JGJ/T 101-2015[S].Beijing:China Architecture&Building Press,2015.(in Chinese))
[15]LARBIJ A.Microscopy applied to the diagnosis of the deterioration of brick masonry[J].Construction and Building Materials,2004,18:299-307.
[16]刘锡荟,张鸿熙,刘经伟,等.用钢筋混凝土构造柱加强砖房抗震性能的研究[J].建筑结构学报,1986,7(5):47-55.(LIU Xihui,ZHANG Hongxi,LIUJingwei,et al.A study of aseismic characteristics of masonry building with reinforced concrete tie-columns[J].Journal of Building Structures,1986,7(5):47-55.(in Chinese))
[17]梁建国,张望喜,郑勇强.钢筋混凝土-砖砌体组合墙抗震性能[J].建筑结构学报,2003,24(3):61-69.(LIANG Jianguo,ZHANG Wangxi,ZHENGYongqiang.Seismic performance of composite walls made of reinforced concrete and brick masonry[J].Journal of Building Structures,2003,24(3):61-69.(in Chinese))
[18]顾祥林,陈贡联,马俊元,等.反复荷载作用下混凝土多孔砖墙体受力性能试验研究[J].建筑结构学报,2010,31(12):123-131.(GU Xianglin,CHENGonglian,MA Junyuan,et al.Experimental study on mechanical behavior of concrete perforated brick walls under cyclic loading[J].Journal of Building Structures,2010,31(12):123-131.(in Chinese))