基于ANSYS的钢筋混凝土异形柱构件加固的非线性有限元分析
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摘要
对现有结构的维修及受损结构的加固、修复是结构工程所面临的主要问题之一。钢筋混凝土异形柱结构由于良好的建筑空间功能而得到广泛的工程应用。异形柱结构作为一种新型的结构形式,目前针对其加固的研究较少,所以有必要进行深入研究,其中对于结构中不规则截面的异形柱构件的加固尤为重要。随着钢筋混凝土有限元技术的发展,采用有限元的方法对钢筋混凝土异形柱加固的非线性分析成为现实。一方面减少实验开支、减轻劳力、节省时间,同时还可以为工程应用提供参考指导。
本文利用商业有限元软件ANSYS对混凝土异形柱加固的性能进行了分析。文中从异形柱及混凝土加固技术的发展入手,对其进行了回顾,并介绍了有限元软件在结构工程中的应用,通过对现有文献的查阅,本文主要做了以下工作:
(1)通过比较异形柱与普通矩形柱在截面特征和力学性能上的差异,总结出几种常用混凝土加固方法应用于异形柱加固的利弊,分析得出湿式外包钢加固法和CFRP加固法应用于加固异形柱具有良好的性能。
(2)用ANSYS有限元分析软件对湿式外包钢加固RC-L形柱偏压下的力学性能做了非线性分析。有限元分析得出了试件加固前后的裂缝开展情况、应力分布情况及混凝土受拉区的荷载-位移曲线。对比分析结果,得出湿式外包钢加固法应用于钢筋混凝土异形柱构件的加固具有良好的性能。
(3)用ANSYS有限元分析软件对CFRP加固RC-L形柱做了有限元模拟实验及模态分析。分析结果表明异形柱加固后的承载力和变形能力有所提高。本文基于ANSYS对钢筋混凝土异形柱加固的模拟试验具有创新性。本文的模拟实验及分析结论为异形柱加固技术的深入研究及工程应用提供了参考。
One main mission for structural engineering is the maintaining for existing structures and the reinforcement and the repair for destroyed structures.Reinforced concrete structure with special-shaped columns is used more and more widely with the satisfactory architectural functions in engineering application.Specially shaped column structure is a new type of structure and there are not enough research on reinforcement of specially shaped column,so it is necessary to take further research,especially for columns with irregular section.With the development of the concrete finite element method,nonlinear analysis with element for reinforcement of specially shaped column is reliable.On one hand,the budget of the experiment and both the time and the labor can be cut with FEM,on the other hand,it’s a reference for engineering application.
With finite element analysis software-ANSYS,the behavior of reinforcement of specially shaped columns has been analyzed in this paper.It begins with the review of development of specially shaped column and strengthening technology of concrete,and presents a detail instruction about application of finete element software in field of structural engineering.The main tasks in this paper are:
(1) By comparing the differences of section feature and mechanical properties between specially shaped column and common rectangular colum,this paper sums up the pros and cons of some reinforcement methods applied in reinforcing RC columns with special shape.From the analysis results,it has good performances while applying wet-enclosing steel and CFRP reinforcement methods in RC columns with special shape.
(2) Nonlinear simulation analysis is performed to study the behavior of wet enclosing steel reinforced RC-L columns with finite element software-ANSYS.Some valuable formations can be gained,such as the distribution chart of crack of concrete at some time,the strain distribution of steel and concrete,and the loading-stress curve.Compared with the analysis results and obtained that it has a good performance to reinforce RC column with special shape by wet-enclosing steel reinforcement method.
(3) Nonlinear simulation analysis and modal analysis is performed to study the behavior of CFRP reinforced RC-L columns with finite element software-ANSYS.From the finite element analysis results,the vertical bearing capacity and displacement capacity are both enhanced after reinforcement.
It has certain creativity that simulation analysis of reinforced RC columns with special shape based on ANSYS.This paper’s simulation analysis and results provide reference for further innovation research and engineering application.
本文利用商业有限元软件ANSYS对混凝土异形柱加固的性能进行了分析。文中从异形柱及混凝土加固技术的发展入手,对其进行了回顾,并介绍了有限元软件在结构工程中的应用,通过对现有文献的查阅,本文主要做了以下工作:
(1)通过比较异形柱与普通矩形柱在截面特征和力学性能上的差异,总结出几种常用混凝土加固方法应用于异形柱加固的利弊,分析得出湿式外包钢加固法和CFRP加固法应用于加固异形柱具有良好的性能。
(2)用ANSYS有限元分析软件对湿式外包钢加固RC-L形柱偏压下的力学性能做了非线性分析。有限元分析得出了试件加固前后的裂缝开展情况、应力分布情况及混凝土受拉区的荷载-位移曲线。对比分析结果,得出湿式外包钢加固法应用于钢筋混凝土异形柱构件的加固具有良好的性能。
(3)用ANSYS有限元分析软件对CFRP加固RC-L形柱做了有限元模拟实验及模态分析。分析结果表明异形柱加固后的承载力和变形能力有所提高。本文基于ANSYS对钢筋混凝土异形柱加固的模拟试验具有创新性。本文的模拟实验及分析结论为异形柱加固技术的深入研究及工程应用提供了参考。
One main mission for structural engineering is the maintaining for existing structures and the reinforcement and the repair for destroyed structures.Reinforced concrete structure with special-shaped columns is used more and more widely with the satisfactory architectural functions in engineering application.Specially shaped column structure is a new type of structure and there are not enough research on reinforcement of specially shaped column,so it is necessary to take further research,especially for columns with irregular section.With the development of the concrete finite element method,nonlinear analysis with element for reinforcement of specially shaped column is reliable.On one hand,the budget of the experiment and both the time and the labor can be cut with FEM,on the other hand,it’s a reference for engineering application.
With finite element analysis software-ANSYS,the behavior of reinforcement of specially shaped columns has been analyzed in this paper.It begins with the review of development of specially shaped column and strengthening technology of concrete,and presents a detail instruction about application of finete element software in field of structural engineering.The main tasks in this paper are:
(1) By comparing the differences of section feature and mechanical properties between specially shaped column and common rectangular colum,this paper sums up the pros and cons of some reinforcement methods applied in reinforcing RC columns with special shape.From the analysis results,it has good performances while applying wet-enclosing steel and CFRP reinforcement methods in RC columns with special shape.
(2) Nonlinear simulation analysis is performed to study the behavior of wet enclosing steel reinforced RC-L columns with finite element software-ANSYS.Some valuable formations can be gained,such as the distribution chart of crack of concrete at some time,the strain distribution of steel and concrete,and the loading-stress curve.Compared with the analysis results and obtained that it has a good performance to reinforce RC column with special shape by wet-enclosing steel reinforcement method.
(3) Nonlinear simulation analysis and modal analysis is performed to study the behavior of CFRP reinforced RC-L columns with finite element software-ANSYS.From the finite element analysis results,the vertical bearing capacity and displacement capacity are both enhanced after reinforcement.
It has certain creativity that simulation analysis of reinforced RC columns with special shape based on ANSYS.This paper’s simulation analysis and results provide reference for further innovation research and engineering application.
引文
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[2] Ngo, D. Seordelis, A.C. .Finite element analysis of reinforced concrete beams. ACI, 1967, 64(3): 152~163.
[3] Nilson, A.H. .Nonlinear analysis of reinforced eoncrete by finite elemen method.ACI, 1968, 65(9): 757~766.
[4]江见鲸.钢筋混凝土结构非线性有限元分析[M].西安:陕西科技出版社, 1994: 1~23.
[5]中华人民共和国国家标准.建筑抗震设计规范(GB50011-2001).北京:中国建筑工业出版社, 2001.
[6]中华人民共和国行业标准.混凝土异形柱结构技术规范(JGJ 149--2006).北京:中国建筑工业出版社,2006.
[7]徐玉野.钢筋混凝土异形柱结构性能研究与展望[J].建筑技术, 2006, 27, 2: 136~139.
[8]天津异形柱规程编制组.钢筋砼异形柱结构计算及配筋软件CRCS用户手册及编制原理, 2004.
[9] Shinsuke NAKATA, Toshikazu Kawashima, hideharu Sekiguchi. A repair effect of reinforced concrete joint assembles subjected to seismic loads.Proceedings of the 3rd seminar on repair and retrofit of structure, the university of Michigan, May 1982, 56-100.
[10] Catherine Wolfgram French, Gregory A, and wen-Jen Tsai. Epoxy repair techniques for moderate earthquake damage. ACI Structural Journal, V87, No.4, July-August 1990: 416-424.
[11] Hamid Saadatmanesh, Mohammad R Ehsani, Limin Jin. Seismic Strengthening of Circular Bridge Pier Model with Fiber Composites [J]. ACI Structural Journal, 1996, 93(6): 639-647.
[12] Ashraf,Biddah, A.Ghobarah, and tarek S.Aziz. upgrading of nonductile Reinforced Concrections. Journal of structural Engineering,Vol. 123, No8, ASCE 1997: 1001-1010.
[13] Shamim A.Sheikh, Grace Yau.Seismic Behavior of Concrete Columns Confined with Steel and Fiber-Reinforced Polymers [J]. ACI Structural Journal , 2002, 99(1): 72-80.
[14] Ahmed Ghobabah, A.Said.Shear strengthening of beam-column joints.Engineering Structures, 2002, 24: 881-888.
[15] Li J, Hadi M N S. Behaviour of Externally Confined HighStrength Concrete Columns under Eccentric Loading [J]. Composite Structures, 2003, 62: 145-153.
[16]卢亦焱,史健勇,赵国藩.碳纤维布和角钢复合加固轴心受压混凝土柱的试验研究[J].建筑结构学报, 2003, 24(5): 18-23.
[17]童光兵.外包钢与碳纤维布复合加固钢筋砼偏压柱研究[D].武汉:武汉大学, 2004.
[18]卢亦焱,陈少雄,赵国藩.外包钢与碳纤维布复合加固钢筋混凝土柱抗震性能试验研究[J].土木工程学报, 2005, 38(8): 10-17.
[19]卢亦焱,童光兵,张号军.外包钢与碳纤维布复合加固钢筋混凝土偏压柱试验研究[J].建筑结构学报, 2006, 27(1): 106-123.
[20]卢亦焱,童光兵,赵国藩,张号军.外包钢与碳纤维布复合加固钢筋混凝土偏压柱受力全过程分析[J].工程力学, 2006, 23(7): 72-92.
[21]卢亦焱,童光兵,赵国藩,张号军.外包角钢与碳纤维布复合加固钢筋混凝土偏压柱承载力计算分析[J].土木工程学报, 2006, 39(8): 19-25.
[22] Hadi M N S. Behaviour of FRP strengthened concrete columns under eccentric compression loading[J]. Composite Structures, 77(2007): 92-96.
[23]荀敬川.加固后异形柱框架抗震性能试验研究[D][硕士学位论文].河北工业大学, 2006.
[24]杨勇,薛建阳,赵鸿铁.考虑粘结滑移的性钢混凝土结构ANSYS模拟方法研究[J].西安建筑科技大学学报(自然科学版), 2006, 38(3): 302-310.
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