基于精细化有限元模型的自保温暗骨架承重墙抗震性能分析
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摘要
从抗震节能一体化角度提出了面向村镇建筑的新型结构体系,即自保温暗骨架承重墙结构体系,该结构体系由暗骨架提供约束,具有多道抗震设防能力。为探索自保温暗骨架承重墙的抗震性能,本文建立了其精细化有限元模型,该模型由混凝土小型空心砌块、混凝土暗骨架以及钢筋等组合而成,采用"牵引力-分离模型"考虑了各组块之间的接触关系。通过分析低周反复荷载作用下墙体的破坏模式、极限承载力以及墙体裂缝开展过程等,研究了高宽比、竖向荷载以及暗骨架布置方式对其抗震性能的影响,结果表明:所建立的精细化有限元模型求解高效、结果可靠;自保温暗骨架承重墙的破坏分为弯曲型、剪切-弯曲型、剪切型三种类型。据此,补充提出了自保温暗骨架承重墙的抗震设计建议与构造措施,还修正建立了剪切破坏模式下自保温暗骨架承重墙的抗震受剪承载力计算公式。
The self-insulating structure system with inner skeleton is restrained by internal skeleton,which is designed for rural buildings and has many seismic fortification lines. In order to explore the seismic performance of self-insulating structural wall with inner skeleton,a sophisticated finite element( FE) model is established,which consists of small concrete hollow block,inner concrete skeleton and steel bar and uses "traction-separation model "is used to reflect the main contact relationship of the wall. With the laterally reversed low-cyclic loading,the failure mode,ultimate bearing capacity and variation of crack propagation are studied under different height-width ratio,vertical load and arrangement methods of inner skeleton. The results show that the FE model could calculate effectively and reliably, and the wall 's design failure modes are divided into bending, shearing-bending and shearing type.Accordingly,the wall's constructive measures and design suggestions are put forward,and the wall's seismic shear bearing capacity calculation formula under shearing failure type is modified.
The self-insulating structure system with inner skeleton is restrained by internal skeleton,which is designed for rural buildings and has many seismic fortification lines. In order to explore the seismic performance of self-insulating structural wall with inner skeleton,a sophisticated finite element( FE) model is established,which consists of small concrete hollow block,inner concrete skeleton and steel bar and uses "traction-separation model "is used to reflect the main contact relationship of the wall. With the laterally reversed low-cyclic loading,the failure mode,ultimate bearing capacity and variation of crack propagation are studied under different height-width ratio,vertical load and arrangement methods of inner skeleton. The results show that the FE model could calculate effectively and reliably, and the wall 's design failure modes are divided into bending, shearing-bending and shearing type.Accordingly,the wall's constructive measures and design suggestions are put forward,and the wall's seismic shear bearing capacity calculation formula under shearing failure type is modified.
引文
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[14]GB 50011-2010,建筑抗震设计规范[S]GB 50011-2010,Code for Seismic Design of Buildings[S](in Chinese)
[15]姚谦峰,黄炜,田洁,等.密肋复合墙体受力机理及抗震性能试验研究[J].建筑结构学报,2004,25(6):67~74Yao Qian-feng,Huang Wei,Tian Jie,et al.Experimental Analyses of Mechanical Characteristics and Seismic Performance of Multi-Ribbed Panel Wall[J].Journal of Building Structures,2004,25(6):67~74(in Chinese)
[2]Hou Shao-dan,Liu Fu-sheng,Wang Shao-jie,et al.Coupled Heat and Moisturetransfer in Hollow Concrete Block Wall Filled with Compressed Straw Bricks[J].Energy and Buildings,2017,135:74~84
[3]孙雷.自保温暗骨架承重墙结构抗震性能研究[D].泰安:山东农业大学,2014Sun Lei.Study on Seismic Performance of the Self-Insulating Structural Wall with Inner Frame[J].Tai’an:Shandong Agricultural University,2014(in Chinese)
[4]邓宏宇,孙柏涛.框架填充墙等效单杆斜撑简化模型[J].中南大学学报(自然科学版),2017,48(2):440~447Deng Hong-yu,Sun Bai-tao.Equivalent Diagonal Bracing Model of A Frame-Filled Wall[J].Journal of Central South University(Science and Technology),2017,48(2):440~447(in Chinese)
[5]张望喜,段连蕊,廖莎,等.基于ABAQUS的砌体结构动力弹塑性时程分析[J].建筑结构,2016,46(1):64~70Zhang Wang-xi,Duan Lian-rui,Liao Sha,et al.Dynamic Elastic-Plastic Time-History Analysis of Masonry Structure Based on ABAQUS[J].Building Structure,2016,46(1):64~70(in Chinese)
[6]Mondal G,Jain S K.Lateral Stiffness of Masonry Infilled Reinforced Concrete(RC)Frames with Central Opening[J].Earthquake Spectra,2008,24(3):701~723
[7]Shrestha K C,Nagae T,Araki Y.Finite Element Modeling of Cyclic Out-Of-Plane Response of Masonry Walls Retrofitted By Inserting Inclined Stainless Steel Bars[J].Journal of Disaster Research,2011,6(1):36~43
[8]刘桂秋,施楚贤,刘一彪.砌体及砌体材料弹性模量取值的研究[J].湖南大学学报(自然科学版),2008,35(4):29~32Liu Gui-qiu,Shi Chu-xian,Liu Yi-biao.Analyses of the Elastic Modulus Values of Masonry[J].Journal of Hunan University(Natural Sciences),2008,35(4):29~32(in Chinese)
[9]武义馨,刘福胜,赵井辉,等.新型节能承重砌块砌体抗剪强度试验研究[J].混凝土与水泥制品,2016(3):67~70
[10]Sarhosis V,Garrity S W,Sheng Y.Influence of BrickMortar Interface on the Mechanical Behaviour of Low Bond Strength Masonry Brickwork Lintels[J].Engineering Structures,2015,88:1~11
[11]孙雷,崔兆彦,王少杰,等.砌块墙体开裂过程数值模型及模拟分析[J].防灾减灾工程学报,2013,33(S1):78~82Sun Lei,Cui Zhao-yan,Wang Shao-jie,et al.Numerical Model and Numerical Simulation of the Masonry Wall Fracture Process[J].Journal of Disaster Prevention and Mitigation Engineering,2013,33(S1):78~82(in Chinese)
[12]范亮.先后浇混凝土界面抗剪性能研究[D].重庆:重庆交通学院,2004Fan Liang.Study on the Shear Behaviors of Pre-Casting and Post-Casting Concrete Interface[D].Chongqing:Chongqing Jiaotong University,2004(in Chinese)
[13]GB 50010-2010,混凝土结构设计规范[S]GB 50010-2010,Code for Design of Concrete Structures[S].(in Chinese)
[14]GB 50011-2010,建筑抗震设计规范[S]GB 50011-2010,Code for Seismic Design of Buildings[S](in Chinese)
[15]姚谦峰,黄炜,田洁,等.密肋复合墙体受力机理及抗震性能试验研究[J].建筑结构学报,2004,25(6):67~74Yao Qian-feng,Huang Wei,Tian Jie,et al.Experimental Analyses of Mechanical Characteristics and Seismic Performance of Multi-Ribbed Panel Wall[J].Journal of Building Structures,2004,25(6):67~74(in Chinese)