砖墙体抗震承载力仿真分析与试验对比
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摘要
为研究竖向压应力和高宽比对砖墙体抗震性能的影响,以砖墙体抗震承载力典型试验试件为基础,利用有限元分析软件ANSYS建立适当的空间模型。根据砖墙体的破坏模式和材料性能把墙体划分成块体单元、灰缝单元以及接触单元,为各部分材料选用不同的本构关系模型与破坏准则。并将计算结果与试验结果进行对比,验证文中模型的可适用性。选用经验证后的模型,变换竖向压应力和高宽比,得出相应的结论:墙体的开裂荷载和抗侧承载力随着高宽比的增大明显呈降低的趋势;不同高宽比的墙体,竖向压应力的影响规律不尽相同。
Based on the test results of typical brick wall's seismic capacity,a suitable space model is established by utilizing ANSYS to study the behavior of brick walls influenced by the vertical compressive stress and the height-to-width-ratio.Considering the failure mode and material properties,we divided the brick wall into block element,mortar joint element and contact element and adopted different constitutive models and damage criteria for each part material.The results of finite element analysis agree well with experiments,which suggest the applicability of ANSYS for brick wall's analysis.If we adopt the proved models to establish the finite element model of the brick wall for different height-to-width ratios and different vertical compressive stresses,we may prove that the cracking-load and resisting lateral force capacity of wall reduce obviously.When the height-wide-ratio increases,the influence of vertical compressive stress is not the same for the walls with different height-to-width ratios.
Based on the test results of typical brick wall's seismic capacity,a suitable space model is established by utilizing ANSYS to study the behavior of brick walls influenced by the vertical compressive stress and the height-to-width-ratio.Considering the failure mode and material properties,we divided the brick wall into block element,mortar joint element and contact element and adopted different constitutive models and damage criteria for each part material.The results of finite element analysis agree well with experiments,which suggest the applicability of ANSYS for brick wall's analysis.If we adopt the proved models to establish the finite element model of the brick wall for different height-to-width ratios and different vertical compressive stresses,we may prove that the cracking-load and resisting lateral force capacity of wall reduce obviously.When the height-wide-ratio increases,the influence of vertical compressive stress is not the same for the walls with different height-to-width ratios.
引文
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[11]奉杰超.空斗墙砌体的抗震性能试验研究[D].长沙:湖南大学,2009,24-65.FENG Jiechao.The test study of seismic behavior on rowlock cavity wall[D].Changsha:Hunan University,2009,24-65.(in Chinese)
[2]刘立鹏,唐岱新.无筋砌体材料本构模型述评[J].哈尔滨工业大学学报,2004,36(9):1256-1259.LIU Lipeng,TANG Daixin.Constitutive modeling for unreinforced masonry materials[J].Journal of Harbin Institute of Technology,2004,36(9):1256-1259.(in Chinese)
[3]尚守平,蒋隆敏,张毛心.钢筋网高性能复合砂浆加固钢筋混凝土方柱抗震性能的研究[J].建筑结构学报,2006,27(4):16-22.SHANG Shouping,JIANG Longmin,ZHANG Maoxin.Studyon seismic behavior of RC strengthened using high-performancecomposite mortar rein-forced with mesh reinforcements[J].Journal of Building Structures,2006,27(4):16-22.(in Chinese)
[4]Sk Sekender Ali,Adrian W Page.Finite element model for masonry subjected to concentrated loads[S].Journal of Structural Engineering,ASCE,1988,114(8):1761-1784.
[5]Hamid R Lotfi P.Benson Shing.Interface model applied to fracture masonry structures[J].Journal of Structural Engineering,ASCE,1994,120(1):63-80.
[6]王新敏.ANSYS工程结构数值分析[M].北京:人民交通出版社,2007:1-495.WANG Xinmin.ANSYS numerical analysis of engineering structures[M].BeiJing:China Communications Press,2007,1-495.(in Chinese)
[7]杨伟军,施楚贤.砌体受压本构关系研究成果的述评[J].四川建筑科学研究,1999(3):1-9.YANG Weijun,SHI Chuxian.Comment on research achievements of constitutive relationship of compressive brickwork[J].Building Science re-search of Sichuan,1999,(3),1-9.(in Chinese)
[8]刘桂秋.砌体结构基本受力性能的研究[D].长沙:湖南大学,2005:13-51.LIU Guiqiu.Study of masonry structure’s basic mechanical properties[D].Changsha:Hunan University,2005,13-51.(in Chinese)
[9]过镇海,时旭东.钢筋混凝土原理和分析[M].北京:清华大学出版社,2003:15-23.GUO Zhenhai,SHI Xudong.Principle and analysis of reinforced concrete[M].Beijing:Tsinghua University Press,2003,15-23.(in Chinese)
[10]姜忻良,李春波,翟文杰.软土地基上带圈梁构造柱砌体结构的非线性有限元分析[J].地震工程与工程振动,2001,21(3):65-69.JIANG Xinliang,LI Chunbo,ZHAI Wenjie.Nonlinear element analysis of brick masonry structure on soft soil with ring beams and constructionalcolumns[J].Journal of Earthquake Engineering and Engineering Vibration,2001,21(3):65-69.(in Chinese)
[11]奉杰超.空斗墙砌体的抗震性能试验研究[D].长沙:湖南大学,2009,24-65.FENG Jiechao.The test study of seismic behavior on rowlock cavity wall[D].Changsha:Hunan University,2009,24-65.(in Chinese)
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