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1、钢筋混凝土构件的非线性分析 钢筋混凝土构件的非线性分析 Nonlinear Analysis of the Reinforced Concrete Member【中文摘要】 结构试验在“混凝土结构理论”的诞生和发展过程中起着不可估量的作用。但是,结构试验尤其是大型结构的试验往往需要耗费大量的人力和财力,同样的试验很难重复做多次,且缩尺模型试验具有“失真”效应。在此情况下,计算机模拟分析技术日趋成熟,在结构工程领域新成果不断涌现。钢筋混凝土结构是土木工程中应用最广泛的一种结构。但是,对钢筋混凝土的力学性能掌握的还不是很全面,特别是混凝土。传统的解析方法分析钢筋混凝土结构的非线性问题时,只能解决一
2、些非常简单的结构和构件计算问题。对于大量的钢筋混凝土结构分析问题,只能用数值方法解决。钢筋混凝土有限元分析方法能够给出结构内力和变形发展的全过程;能够描述裂缝的形成和开展,以及结构的破坏过程及其形态;能够对结构的极限承载能力和可靠度做出评估;能够揭示出结构的薄弱环节,以利于优化结构设计。同时,它能广泛地适用于各种结构类型和不同受力条件和环境。本文从非线性分析的发展入手,较为详尽的介绍了有限元软件ADINA和ANSYS在钢筋混凝土结构中的应用,逐步分析了钢筋混凝土结构的有限元分析技术,并且利用商业有限元分析软件对混凝土结构中最重要的两类构件梁和柱的性能进行了对比研究分析。通过对现有文献的查询、整
3、理及分析,本文进行了以下主要工作:1、对目前有限元模拟分析方法进行了总结,并系统的介绍了有限元软件ADINA和ANSYS在钢筋混凝土组合结构中应用。2、系统的介绍了钢筋混凝土构件的材料性能以及钢筋混凝土非线性分析的主要数学模型。3、利用ANSYS和ADINA软件对简支梁进行了对比模拟分析。4、利用ANSYS分析软件,进行了7根轴心受压钢骨-方钢管混凝土短柱的模拟试验研究,研究表明钢骨的存在大大加强了柱子的延性。5、利用ANSYS分析软件,进行了2根轴心受压钢骨-方钢管混凝土受弯构件的模拟试验研究。研究表明,在试件受弯过程中可近似认为方钢管和钢骨的变形是协调的。6、利用ANSYS分析软件,进行了
4、3根低周反复荷载下钢骨方钢管混凝土柱抗震性能的研究。研究表明,由于混合柱内部存在钢骨和灌入其内部的混凝土形成的核芯柱,使新型组合柱具有比普通钢筋混凝土柱以及方钢管混凝土柱更好的延性和更高的防倒塌能力【英文摘要】 The structure of the pilot in the “concrete structure” theory of the birth and development of the process plays an immeasurable role.However,the structure of the pilot in particular, large-scale
5、 structure of the test often takes a lot of human and financial resources,it is very difficult to repeat the same test so many times,and the reduced scale model test of a “distortion” effect.In this case,the computer simulation technology matures,the field of structural engineering in the new result
6、s are emerging.Reinforced concrete structures in civil engineering applications is a structure of the most extensive.However,the mechanical properties of reinforced concrete is not available is very comprehensive,particularly in respect of concrete.Analysis of the traditional analytical method of no
7、nlinear reinforced concrete structure problems,can only solve some very simple calculation of the structure and components.For a large number of reinforced concrete structural analysis problems,can only use numerical solutions.Reinforced concrete finite element analysis to give the structure of the
8、internal force and deformation of the entire process of development;To describe the formation of cracks and,as well as the structure and form to undermine the process;Able to limit the carrying capacity of the structure and reliability assessment;Able to reveal weaknesses in the structure in order t
9、o optimize the structure design.At the same time,it widely applicable to a variety of structural types and different stress conditions and environment.In this paper,the development of non-linear analysis approach,a more detailed presentation of the finite element software ADINA and ANSYS in the rein
10、forced concrete structure,step by step analysis of a reinforced concrete structure of the finite element analysis techniques and the use of commercial finite element analysis software for concrete the structure of the two most important components-beams and columns of the comparative study of perfor
11、mance analysis.Existing literature on the inquiry,collation and analysis,this article had the following major tasks:1st,finite element simulation of the current analytical methods are summarized,and system introduction finite element software ADINA and ANSYS applied in the reinforced concrete built-
12、up section.2nd,system introduction reinforced concrete component material performance as well as reinforced concrete nonlinear analysis main mathematical model. 3rd,the use of ANSYS and ADINA software simply supported beam simulation were compared.4th,uses the ANSYS analysis software,conducted 7 rad
13、ical center bearing reinforcing steel-side steel pipe concrete short stump simulation test research,the research had indicated the reinforcing steel the existence strengthened the pillar ductility greatly.5th,based on ANSYS,has conducted 2 radical center bearing reinforcing steel-side steel pipe con
14、crete member in bending simulation test research.The research indicated that,is bent in the test sample in the process to be possible to think approximately the side steel pipe and the reinforcing steel distortion is coordinated.6th,based on ANSYS,has carried on under 3 low week repeatedly loads the
15、 reinforcing steel-side steel pipe coagulation earth pyramid earthquake resistance performance research. The research indicated,because the mixing column interior existence reinforcing steel and pours into the nuclear core column which its internal concrete forms,enable the new built-up column to ha
16、ve compared to the ordinary reinforced concrete column as well as a side steel pipe coagulation earth pyramid better ductility and higher guards against the collapse ability.【中文关键词】 有限元分析; ADINA; ANSYS; 简支梁; 钢骨方钢管混凝土柱 【英文关键词】 Finite element analysis; ADINA; ANSYS; Simply supported beam ; Steel-concr
17、ete-filled rectangular tubular column 【毕业论文目录】摘要 4-5 Abstract 5-6 1 绪论 9-19 1.1 非线性分析简介 9-10 1.2 有限元法简介与发展 10-13 1.2.1 有限元法的发展 10-12 1.2.2 有限元法使用的基本步骤 12-13 1.3 非线性有限元介绍 13-19 1.3.1 线性有限元法 13-15 1.3.2 非线性问题的有限元分析 15 1.3.3 非线性有限元方程的解法 15-19 2 钢筋混凝土的非线性分析 19-47 2.1 钢筋混凝土构件的材料性能 19-36 2.1.1 钢筋的应力应变关系 1
18、9-20 2.1.2 混凝土的破坏准则 20-30 2.1.3 混凝土的本构模型 30-36 2.2 钢筋混凝土的非线性分析 36-47 2.2.1 钢筋混凝土非线性分析的意义 36-38 2.2.2 基于条带划分方法的非线性分析 38-39 2.2.3 基于有限元方法的非线性分析 39-42 2.2.4 钢筋混凝土非线性分析主要数学模型 42-47 3 有限元分析典型应用软件的理论介绍 47-73 3.1 ADINA软件的混凝土本构理论 47-60 3.1.1 ADINA软件简介 47-48 3.1.2 ADINA中求解非线性问题的方法 48-50 3.1.3 ADINA中钢筋混凝土材料模型
19、 50-60 3.2 ANSYS软件的混凝土本构理论 60-73 3.2.1 模型分析 62-64 3.2.2 ANSYS中的SOLID65单元 64-67 3.2.3 材料的本构关系 67-70 3.2.4 混凝土破坏准则与屈服准则 70-73 4 钢筋混凝土梁的ADINA和ANSYS对比分析实例 73-77 4.1 计算模型及材料参数 73 4.2 计算结果对比分析 73-75 4.3 结论及建议 75-77 5 基于ANSYS的钢骨-钢管混凝土柱的有限元分析 77-97 5.1 钢骨-方钢管混凝土短柱轴心受压性能的有限元分析 77-86 5.1.1 前言 77 5.1.2 试验概况和试验
20、结果分析 77-79 5.1.3 有限元模拟分析 79-85 5.1.4 结论与建议 85-86 5.2 钢骨方钢管混凝土构件抗弯力学性能的研究 86-92 5.2.1 前言 86 5.2.2 试验概况与试验结果分析 86-88 5.2.3 有限元模拟分析 88-91 5.2.4 结论与建议 91-92 5.3 低周反复荷载下钢骨方钢管混凝土柱抗震性能的研究 92-97 5.3.1 前言 92 5.3.2 试验概况与试验结果分析 92-94 5.3.3 有限元模拟分析 94-96 5.3.4 结论与建议 96-97 6 结论与展望 97-99 6.1 结论 97 6.2 展望 97-99 参考文献 99-102 攻读硕士学位期间发表学术论文情况 102-103 致谢 103-104
