单调及低周往复荷载作用下砌体非线性分析
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摘要
带构造柱和圈梁的约束砌体结构在四川灾区乡镇房屋重建中被广泛采用,其抗震性能是人们所关心的。基于绵竹市土门镇当地重建房屋常用建筑材料的实验数据以及通用有限元软件AN-SYS中Solid 65单元的性质和特点,用有限元模型模拟了粘土砖砌体在不同压应力状态(σ∕fm)下沿通缝截面抗剪强度试验,给出了相关单元在模拟砖砌体开裂中闭合及开口剪力传递系数的建议值;利用这些结果,分别建立了带约束(构造柱、圈梁等)和不带约束砌体墙的有限元模型,进而分析了他们在单调荷载以及低周往复荷载作用下的抗震性能。结果表明,与不带约束的墙体相比,带约束墙体在单调水平荷载作用下的初裂性能、极值荷载和延性都有很大的提高,在低周往复荷载作用下其耗能能力得到了改善。所得结果可供相应结构抗震设计的参考。
Confined masonry with constructional columns and ring-beams was adopted during the reconstruction of the rural and suburban areas of Sichuan Province after the 2008 Wenchuan earthquake.Based on the results of the sample tests of building material such as clay brick,cement mortar,steel and concrete in reconstruction and the analysis of the characteristics and features using Solid65 elements in ANSYS,the shear property of joints in masonry structures under different compression stress(σ∕fm) was numerically simulated.Comparing the experimental results with the numerical ones,the proposed values of the shear transfer coefficients for open and closed crack of Solid65 elements for simulating masonry structures were given.The seismic performance of confined masonry walls(strengthened by constructional column and ring-beam,etc.) and unconfined masonry walls with different compression stress(σ∕fm) under low cyclic load were discussed.Results show that,under monotonic loading,in comparison with unconfined masonry walls,the confined masonry walls have better performance in incipient crack,ultimate load and ductility;and under low cyclic loading,the energy dissipating ability of confined walls are better improved.The results can be referenced in seimic design of masonry.
Confined masonry with constructional columns and ring-beams was adopted during the reconstruction of the rural and suburban areas of Sichuan Province after the 2008 Wenchuan earthquake.Based on the results of the sample tests of building material such as clay brick,cement mortar,steel and concrete in reconstruction and the analysis of the characteristics and features using Solid65 elements in ANSYS,the shear property of joints in masonry structures under different compression stress(σ∕fm) was numerically simulated.Comparing the experimental results with the numerical ones,the proposed values of the shear transfer coefficients for open and closed crack of Solid65 elements for simulating masonry structures were given.The seismic performance of confined masonry walls(strengthened by constructional column and ring-beam,etc.) and unconfined masonry walls with different compression stress(σ∕fm) under low cyclic load were discussed.Results show that,under monotonic loading,in comparison with unconfined masonry walls,the confined masonry walls have better performance in incipient crack,ultimate load and ductility;and under low cyclic loading,the energy dissipating ability of confined walls are better improved.The results can be referenced in seimic design of masonry.
引文
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[2]贾冠华,袁中夏,钟秀梅,等.不同烈度区农村自建砖砌体房屋震害特征研究[J].世界地震工程,2010,26(4):43–49.JIA Guanhua,YUAN Zhongxiai,ZHONG Xiumei,et al.Study on characteristics of seismic damage to rural self-built brick masonry houses atdifferent intensity zones[J].World Earthquake Engineering,2010,26(4):43-49.
[3]朱伯龙.砌体结构设计原理[M].上海:同济大学出版社,1991:13-29.ZHU Bolong.Design Principles for Masonry Structure[M].Shanghai:Tongji University Press,1991:13-29.
[4]施楚贤.砌体结构理论与设计(第二版)[M].北京:中国建筑工业出版社,1992:36-89.SHI Chuxian.Masinry Structure Theory and Design(2nd Edition)[M].Beijing:China Building Industry Press,1992:36-89.
[5]刘桂秋,施楚贤.砌体受压应力-应变关系[C]//2000年全国砌体结构学术会议论文集.北京:中国建筑工业出版社,2000:12-18.LIU Guiqiu,SHI Chuxian.A generic stress-strain equation for masonry materials in compression[C]//National Conference on Masonry Struc-ture,China Building Industry Press,2000:12-18.
[6]陆新征,江见鲸.利用ANSYS Solid65单元分析复杂应力条件下的混凝土结构[J].建筑结构,2003,33(6):22–24.LU Xinzheng,JIANG Jianjing.Analysis for concrete structure under complex stress condition with Solid65 FEA element of ANSYS[J].BuildingStructure,2003,33(6):22-24.
[7]蔡勇,施楚贤.砌体在剪-压作用下抗剪强度研究[J].建筑结构学报,2004(25):118-123.CAI Yong,SHI Chuxian.Study of the masonry shear strength under shear-compression action[J],Journal of Building Structures,2004,25(5):118-123.
[8]吕伟荣,施楚贤.剪压复合作用下普通砖砌体的ANSYS分析[C]//2005年全国砌体结构基本理论与工程应用学术会议论文集.北京:中国建筑工业出版社,2005:126-130.LV Weirong,SHI Chuxian.Analysis of mechanical performance for fired common brick masonry under combined shear and compression using AN-SYS[C]//National Conference on Masonry Structure Theory and Application in Engineering,China Building Industry Press,2005:126-130.
[9]李英民,韩军,刘立平.ANSYS在砌体结构非线性有限元分析中的应用研究[J].重庆建筑大学学报,2006,28(5):89-96.LI Yingmin,HAN Jun,LIU Liping.Application of ANSYS to finiteElement analysis for nonlinear masonry structures[J].Journal of Civil,Archi-tectural&Environmental Engineering,2006,28(5):89-96.
[10]江见鲸,陆新征,叶列平.混凝土结构有限元分析[M].北京:清华大学出版社,2005:144-211.JIANG Jianjing.Finite element analysis of concrete structures[M],Beijing,Tsinghua University Press,2005:144-211.
[11]司炳君,孙治国,艾庆华.Solid65单元在混凝土结构有限元分析中的应用[J].工业建筑,2007,37(1):87-92.Si Bingjun,Sun Zhiguo,Ai Qihua.Application of Solid65 Element in the Finite Element Analysis of Concrete Structures[J].Industrial Construc-tion,2007,37(1):87-92.
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