T形短肢剪力墙静力性能有限元仿真分析
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摘要
利用有限元分析软件ANSYS,首先采用其中三维实体单元SOLID65建立了T形短肢剪力墙有限元分析模型,从弹性到混凝土开裂直至破坏的全过程进行了仿真试验分析。分析了影响短肢剪力墙受力的几种因素:混凝土强度等级、配筋率、轴压比、墙肢截面高厚比对短肢剪力墙承载能力、变形能力及延性的影响,剖析了短肢剪力墙破坏过程及其原因。比较真实的反映了短肢剪力墙在轴压力和逐步加载侧向力共同作用下的响应。试验结果表明:增加混凝土等级和轴压比能提高试件的开裂、屈服和极限荷载,但应综合考虑其与变形能力、延性的关系。截面配筋率具有其特殊性,配筋率在1.4%~1.6%之间时试件的承载能力、变形能力及延性较好。墙肢截面高厚比是不稳定因素但在高厚比为6.5~7.1时,延性及变形能力较强。
Finite element analysis model of the T-shaped short-leg shear wall is constructed by using the 3D solid elements package SOLID65 of the general FEA program ANSYS.The simulation covers the whole loading process from the elastic deformation stage to the crack and failure of the concrete.Several factors which may influence the bearing capacity,deformation capacity and ductility of the short-leg shear wall are discussed,such as concrete strength grade, reinforcement ratio,ratio of axial compressive force to axial compressive ultimate capacity of section and ratio of height to sectional thickness of the wallcolumn.The failure process and its cause are analyzed and the response of the short-leg shear wall under the combination loading of the axial compressive force and progressive lateral forces.The simulation results indicate that raising the concrete strength grade and ratio of axial compressive force to axial compressive ultimate capacity of section can increase the loads of crack and yielding as well as the ultimate bearing capacity of the specimen while the deformation capacity and ductility should also be considered.Bearing capacity,deformation capacity and ductility of the shear wall are relatively good when reinforcement ratio is between 1.4% and 1.6%.ratio of height to sectional thickness of the wall-column is an unsteady factor,but deformation capacity and ductility are relatively good when this ratio is between 6.5 and 7.1.
Finite element analysis model of the T-shaped short-leg shear wall is constructed by using the 3D solid elements package SOLID65 of the general FEA program ANSYS.The simulation covers the whole loading process from the elastic deformation stage to the crack and failure of the concrete.Several factors which may influence the bearing capacity,deformation capacity and ductility of the short-leg shear wall are discussed,such as concrete strength grade, reinforcement ratio,ratio of axial compressive force to axial compressive ultimate capacity of section and ratio of height to sectional thickness of the wallcolumn.The failure process and its cause are analyzed and the response of the short-leg shear wall under the combination loading of the axial compressive force and progressive lateral forces.The simulation results indicate that raising the concrete strength grade and ratio of axial compressive force to axial compressive ultimate capacity of section can increase the loads of crack and yielding as well as the ultimate bearing capacity of the specimen while the deformation capacity and ductility should also be considered.Bearing capacity,deformation capacity and ductility of the shear wall are relatively good when reinforcement ratio is between 1.4% and 1.6%.ratio of height to sectional thickness of the wall-column is an unsteady factor,but deformation capacity and ductility are relatively good when this ratio is between 6.5 and 7.1.
引文
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[2]高层建筑混凝土结构技术规程(征求意见稿)[S],2001.Code for technology of concrete structure in tall bu ild ing(paper ofsuggest requ ired),2001.
[3]陈波,吕西林,李培振,等.用ANSYS模拟结构-地基动力相互作用振动台试验的建模方法[J].地震工程与工程振动,2002,22(1):126~131.Chen Bo,Lv X ilin,L i Peizhen,etc..Modeling of dynam ic soil-structure interaction by ANSYS program.Earthquake Engineeringand Engineering V ibration,2002,22(1):126~131.
[4]宋建学,彭少民,刘立新.短肢剪力墙低周反复试验研究[J].华中科技大学学报(城市科学版),2002,19(1):91~94.Song Jianxue,Peng Shaom in,L iu L ixin.Short-limbed wallstructure under horizontal cyclic load ing test.Journal HuazhongUn iv.of Sci.&Tech.(Urban Science Ed ition),2002,19(1):91~94.
[5]博弈创作室.ANSYS 7.0基础教程与实例详解[M].北京:中国水利水电出版社,2004.Boyi design ing room.Basic lecture and real ob ject case detailed toexplain ofANSYS 7.0.Beijing:Ch ina W aterPower Press,2004.
[6]混凝土结构设计规范(GB50010-2002)[S].北京:中国建筑工业出版社,2002.Code for design of concrete structure.(GB50010-2002).Bei-jing:Ch ina Construction Industrial Pub lish ing House,2002.
[7]罗时磊,李青宁,张军谋.短肢剪力墙有限元仿真分析[J].工程力学,2003,278~281.LuoSh ilei,L iQ ingn ing,ZhangJunmou.F in ite elem ent simu lativeanalysis of short-leg shear wall.Engineering M echan ics,2003,278~281.
[8]李晋,谢永利,冯忠居.土体参数对大直径空心桩承载性状影响的仿真分析[J].工程地质学报,2005,13(1):129~134.L i Jin,X ie Yongli,Feng Zhongju.Emu lation analysis of the soil pa-ram eters'effects on the bearing performance of the large d iam eterhollow p ile.Journal of Engineering Geology,2005,13(1):129~134.
[9]王东红,谢星,赵法锁,祁生文,茹伯勋.黄土地区超长钻孔灌注桩荷载传递性状试验研究[J].工程地质学报,2005,13(1):117~123.W ang Donghong,X ie X ing,et al..On bearing behavior of supper-long hole bored p ile in X i′an.Journal of Engineering Geology,2005,13(1):117~123.
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