内加劲环对圆钢管相贯节点性能的影响
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摘要
近年来,钢管结构在国内外得到了广泛的应用。在钢管结构中,节点是至关重要的构件之一,其破坏往往导致与之相连的若干杆件的失效,从而使整个结构破坏。目前钢管结构常用的节点形式为相贯节点,但在实际工程中常常遇到简单相贯节点无法满足节点强度要求的情况,为了提高节点的承载力和疲劳寿命,往往采用不同的加强构造措施对相贯节点进行加强,在主管内设置内加劲环是应用较多的加强措施。加劲环相贯节点在节点区域内的应力分布十分复杂,准确掌握其应力、应变分布情况对节点的设计、制作尤为重要,因此加劲环相贯节点的研究对钢管结构的发展有着极其重要的理论价值和广泛的应用前景。本文以主管内设置双加劲环的相贯节点(包括X型和空间相贯节点)为研究对象,研究工作主要包括:
在查阅国内外相关文献的基础上,介绍了钢管结构的发展现状及相贯节点的相关知识,回顾了加劲环相贯节点的发展历史,简述了国内外加劲环相贯节点的研究现状及目前亟待解决的问题,并提出本文的主要研究内容。
基于国内外学者关于加劲环相贯节点的理论分析方法,介绍了本文所采用的理论分析方法,并简要概括了有限元法的相关知识及大型通用有限元分析软件ANSYS的相关内容。
应用ANSYS软件对X型加劲环相贯节点建立了有限元计算模型,并对内加劲环设置情况各不相同的4种X型相贯节点进行了非线性有限元分析及试验研究,分别将理论计算得到的节点应变、位移、极限承载力及破坏模式与试验结果相对比,验证了有限元模型的正确性,进而对内加劲环各参数(包括加劲环厚度、宽度、间距等)对X型相贯节点承载力的影响做了系统分析,拟合得到了X型加劲环相贯节点承载力提高倍数的公式,结合钢结构设计规范,得到了X型加劲环相贯节点承载力的计算公式。
以大连国际会议中心为工程背景,应用ANSYS软件对屋盖结构中受力较大、如未设置内加劲环时节点强度较差的空间相贯节点进行了非线性有限元分析。简要介绍了相贯节点有限元计算模型各关键参数的设置,系统分析了在其他参数不变的前提下内加劲环间距对节点强度、刚度及破坏模式等性能的影响,提出了在空间相贯节点主管内设置加劲环合理的构造要求,并对空间相贯节点进行了内加劲环相关参数的系统分析,为该工程的设计提供了理论依据。
最后,总结了本文的主要研究成果,对今后关于加劲环相贯节点的研究进行了展望。
In recent years, hollow section structure has been widely used at home and abroad. In hollow section structure, joint is one of crucial components. Its damage often leads to failure of members which connect with it, even the whole structure. At present, simple joints are widely used in hollow section structures and can not satisfy the strength requirement in some cases. To improve the bearing capacity and fatigue life of simple joints, commonly we use different methods as enhancing measure, and mostly the solution we choose is setting ring-stiffener in main tube. The distribution of stress in stiffened joint is very complex. It is important to control the stress and strain of joints in designing and manufacture, therefore the research of ring-stiffened joint has important theoretic value and broad application prospect in the development of hollow section structures.
Ring-stiffened joints (including X-joints and multiplanar stiffened joints) were investigated in this thesis, work mainly included:
Based on references of domestic and abroad, the research achievements of hollow section structures and relevant knowledge of simple joints were introduced. At the same time, the development history of internally ring-stiffened joints was reviewed, the research status and present problems were expounded, and the main research contents of this thesis were put forward.
Based on the theoretical analysis methods about internally ring-stiffened joint of domestic and overseas scholars, the theoretical analysis method used in this study was introduced, and finite element method and related contents of ANSYS were summarized briefly.
A finite element model of ring-stiffened X joint was established with ANSYS, and four X joints which had different settings of stiffener was tested and analysed with nonlinear finite element method. And then, theoretical results were compared with test results respectively, including strain, displacement, the ultimate load capacity and failure mode. In this way, the finite element modal was validated. After that, the effect of the parameters of ring-stiffener (including ring-stiffener thickness, width, spacing and so on) to ultimate load capacity of stiffened X joint was analysed, and the formula of ultimate load capacity reinforcing multiples of ring-stiffened X joint was proposed using regression techniques.
Based on Dalian international conference center project, the multiplanar joint which bears heavy loads and has poor strength without ring-stiffener was analysed using ANSYS non-linear finite element analysis method. The setting of each key parameter in finite element model was briefly introduced, and the effects of ring-stiffened spacing on strength, stiffness and failure modes of stiffened joints were systematically analyzed while keeping other parameters constant. Then, some reasonable detailed requirements of internal stiffeners were given, which provided some theoretical basis for designing of this project.
In the end, the main achievement of this study was summarized. At the same time, some directions for future research in ring-stiffened joints were suggested.
在查阅国内外相关文献的基础上,介绍了钢管结构的发展现状及相贯节点的相关知识,回顾了加劲环相贯节点的发展历史,简述了国内外加劲环相贯节点的研究现状及目前亟待解决的问题,并提出本文的主要研究内容。
基于国内外学者关于加劲环相贯节点的理论分析方法,介绍了本文所采用的理论分析方法,并简要概括了有限元法的相关知识及大型通用有限元分析软件ANSYS的相关内容。
应用ANSYS软件对X型加劲环相贯节点建立了有限元计算模型,并对内加劲环设置情况各不相同的4种X型相贯节点进行了非线性有限元分析及试验研究,分别将理论计算得到的节点应变、位移、极限承载力及破坏模式与试验结果相对比,验证了有限元模型的正确性,进而对内加劲环各参数(包括加劲环厚度、宽度、间距等)对X型相贯节点承载力的影响做了系统分析,拟合得到了X型加劲环相贯节点承载力提高倍数的公式,结合钢结构设计规范,得到了X型加劲环相贯节点承载力的计算公式。
以大连国际会议中心为工程背景,应用ANSYS软件对屋盖结构中受力较大、如未设置内加劲环时节点强度较差的空间相贯节点进行了非线性有限元分析。简要介绍了相贯节点有限元计算模型各关键参数的设置,系统分析了在其他参数不变的前提下内加劲环间距对节点强度、刚度及破坏模式等性能的影响,提出了在空间相贯节点主管内设置加劲环合理的构造要求,并对空间相贯节点进行了内加劲环相关参数的系统分析,为该工程的设计提供了理论依据。
最后,总结了本文的主要研究成果,对今后关于加劲环相贯节点的研究进行了展望。
In recent years, hollow section structure has been widely used at home and abroad. In hollow section structure, joint is one of crucial components. Its damage often leads to failure of members which connect with it, even the whole structure. At present, simple joints are widely used in hollow section structures and can not satisfy the strength requirement in some cases. To improve the bearing capacity and fatigue life of simple joints, commonly we use different methods as enhancing measure, and mostly the solution we choose is setting ring-stiffener in main tube. The distribution of stress in stiffened joint is very complex. It is important to control the stress and strain of joints in designing and manufacture, therefore the research of ring-stiffened joint has important theoretic value and broad application prospect in the development of hollow section structures.
Ring-stiffened joints (including X-joints and multiplanar stiffened joints) were investigated in this thesis, work mainly included:
Based on references of domestic and abroad, the research achievements of hollow section structures and relevant knowledge of simple joints were introduced. At the same time, the development history of internally ring-stiffened joints was reviewed, the research status and present problems were expounded, and the main research contents of this thesis were put forward.
Based on the theoretical analysis methods about internally ring-stiffened joint of domestic and overseas scholars, the theoretical analysis method used in this study was introduced, and finite element method and related contents of ANSYS were summarized briefly.
A finite element model of ring-stiffened X joint was established with ANSYS, and four X joints which had different settings of stiffener was tested and analysed with nonlinear finite element method. And then, theoretical results were compared with test results respectively, including strain, displacement, the ultimate load capacity and failure mode. In this way, the finite element modal was validated. After that, the effect of the parameters of ring-stiffener (including ring-stiffener thickness, width, spacing and so on) to ultimate load capacity of stiffened X joint was analysed, and the formula of ultimate load capacity reinforcing multiples of ring-stiffened X joint was proposed using regression techniques.
Based on Dalian international conference center project, the multiplanar joint which bears heavy loads and has poor strength without ring-stiffener was analysed using ANSYS non-linear finite element analysis method. The setting of each key parameter in finite element model was briefly introduced, and the effects of ring-stiffened spacing on strength, stiffness and failure modes of stiffened joints were systematically analyzed while keeping other parameters constant. Then, some reasonable detailed requirements of internal stiffeners were given, which provided some theoretical basis for designing of this project.
In the end, the main achievement of this study was summarized. At the same time, some directions for future research in ring-stiffened joints were suggested.
引文
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