圆中空夹层钢管混凝土柱在扭转受力状态下的力学性能研究

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摘 要
圆中空夹层钢管混凝土柱在扭转受力状态下的力学性能研究 摘要
中空夹层钢管混凝土是在两个同心放置的钢管之间灌注混凝土而形成的构件， 具有 承载力高、塑性和韧性好、施工方便、耐火性能好、截面开展、抗弯刚度大、自重轻等 特点。中空夹层钢管混凝土的内、外钢管可采用圆、方、矩形或其他截面形状钢管的两 两组合，本文主要研究内外都采用圆钢管的组合形式，称之为圆中空夹层钢管混凝土。 研究中空夹层钢管混凝土柱的纯扭性能是进行压扭、弯扭、压弯扭及压弯剪扭复杂 受力状态下力学性能研究的基础。 本文从理论和试验两个方面较深入地研究了圆中空夹 层钢管混凝土纯扭构件的力学性能， 并在参数分析的基础上提出了圆中空夹层钢管混凝 土纯扭构件抗扭极限承载力的实用计算方法，具体进行了以下几个方面的工作： 1.总结了目前国内外相关研究成果，确定了本文中圆中空夹层钢管混凝土柱在纯扭 受力状态下力学性能的理论分析方法和试验方案。 2.以名义含钢率和空心率为主要参数，进行了 6 个圆中空夹层钢管混凝土和 1 个双 层空钢管纯扭构件的试验研究，并详细分析了试验数据和结果。 3.使用有限元方法对钢管混凝土纯扭构件的扭矩-转角曲线进行了计算， 并把有限元 计算结果与试验结果进行比较，用以验证有限元计算模型的可靠性。在此基础上，对扭 转状态下圆中空夹层钢管混凝土的扭矩-转角全过程进行了分析，从构件的破坏形态、 受力全过程中的钢管和核心混凝土的工作状态、 钢管与核心混凝土之间的相互作用等方 面较为深入地揭示了圆中空夹层钢管混凝土扭转构件的工作机理。 4.分析了名义含钢率、外钢管屈服强度、混凝土强度、内管屈服强度、内管径厚比、 空心率等主要参数对中空夹层钢管混凝土扭矩-转角曲线的影响规律。在此基础上，提 出了圆中空夹层钢管混凝土纯扭构件抗扭极限承载力的简化计算公式， 可供工程设计参 考。 关键词：圆中空夹层钢管混凝土，扭转构件，试验研究，有限元分析
学 位 申 请 人 ： 黄斌洁 学 科 专 业 ： 结构工程 指 导 教 师 ： 黄宏 副教授
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2 1 0 2 届硕士学位论文
华东交通大学
圆中空夹层钢管混凝土柱在扭转受力状态下的力学性能研究
土木建筑学院
黄斌洁
独创性声明
本人郑重声明：所呈交的学位论文是我个人在导师指导下进行的研究 工作及取得的研究成果。尽我所知，除了文中特别加以标注和致谢的地方 外，论文中不包含其他人已经发表和撰写的研究成果，也不包含为获得华 东交通大学或其他教育机构的学位或证书所使用过的材料。与我一同工作 的同志对本研究所做的任何贡献均已在论文中作了明确的说明并表示了谢 意。
I
Abstract
RESEARCH ON BEHAVIOUR OF CONCRETE FILLED DOUBLE-SKIN STEEL TUBULAR COLUMNS SUBJECTED TO PURE TORSION ABSTRACT
Concrete filled double-skin steel tubular (CFDST) is a new type of composite structure filled with concrete between two concentric steel tubes. It can offer many advantages, such as high bearing capacity, good plasticity and malleability, convenient construction, high fire resistance, high bending rigidity, light deadweight. The cross-section of the outer and inner steel tube are various, such as circle, square, rectangle and some others. One kind of CFDST section tubes was studied in this paper, that is, the outer steel tubes are circular hollow sections (CHS), while the inner steel tubes are CHS. The pure torsional behavior of concrete filled double-skin steel tubular columns is the basis of the behaviour of CFDST subject to compression-torsion, bending-torsion, compression-bending-torsion and compression-bending-shearing. Behaviour and mechanism of concrete-filled double-skin steel tubular columns were investigated in this paper including experimental and theoretical studies. Through the parametric analysis, the practical calculation methods for pure torsional capacity were developed. The main achievements were summarized in detail as follows: (1) The relevant researches were reviewed firstly. The finite element method and test program were selected for the behaviour analysis of concrete filled double-skin steel tubular columns subjected to pure torsion. (2) Six concrete filled double-skin steel tubular columns and one double hollow tubes were tested under pure torsion. The primary parameters in the tests were nominal steel ratio and hollow section ratio, and the phenomena and data of the tests were analysed in detail. (3) Torque-angle relationship curves of concrete filled double-skin steel tubular columns subjected to pure torsion were analyzed by finite element software ABAQUS. The numerical results are compared with the experimental results. The calculated results were in good agreement with experimental data, the reliability of finite element model was verified. Work mechanism on the composite columns was analyzed at three aspects: Failure modes of the composites, stress distributions of steel and concrete and interactions between steel and concrete. (4) Based on the finite element method, parametric analysis was performed on the behaviors of Torque-angle relationships for the composite columns. The selected parameters were the nominal steel ratio, the inner and outer tubes yield strength, hollow section ratio, concret compression strength, etc. Finally, practical calculation methods for pure torsional capacity were put forward, which can serve the engineering design.
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硕 士 学 位 论 文
圆中空夹层钢管混凝土柱在扭转受力状态下 的力学性能研究
1.3 本文的研究思路与主要内容......................................... 10 试验研究......................................................... 11 2.1 引言............................................................. 11 2.2 试验概述......................................................... 11 2.2.1 2.2.2 试件设计及制作............................................. 11 材料特性................................................... 12 钢材材料性能 ......................................... 12 混凝土材料性能 ....................................... 13
II
Abstract
Key Words: double-skin concrete filled steel tubes, pure torsion, experiment, finite element analysis
III
目 录
目 录
主要符号说明.............................................................. I 第一章 绪 论............................................................. 1 1.1 课题来源.......................................................... 1 1.2 相关课题的研究现状................................................ 4 1.2.1 1.2.2 1.2.3 1.2.4 第二章 钢管混凝土扭转研究现状...................................... 4 离心钢管混凝土扭转研究现状.................................. 5 圆CFRP-钢管混凝土扭转研究现状 .............................. 6 中空夹层钢管混凝土研究现状.................................. 7
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