对组件法的修正与改进及其在钢结构节点本构关系研究中的应用

发布时间：2018-04-13 10:56

本文选题：节点刚度 + 强弱轴　；参考：《华南理工大学》2015年博士论文

【摘要】：常规结构设计通常会把梁柱连接节点假定为理想刚接或者铰接来进行处理,随着国内外众多学者对钢结构节点的分析研究越来越深,学术界普遍认为钢节点是具有一定转动刚度的。对于钢结构节点的研究,主要分为三种手段:试验研究,有限元分析,组件法。到目前为止,组件法主要应用在常规节点形式中常规构件的结构性能分析上,对于一些特殊组件的性能分析还有所欠缺,而且没有给出较为规范的条文说明。随着钢结构领域在建筑行业的迅速发展,越来越多的节点形式在多高层钢框架结构中得到应用。对节点性能有个快速、初步的性能预估显得越来越重要,组件法在这方面需要做出的修正和改进也是必不可少的。本文的研究工作是从以下几个方面展开的:(1)设计了十组不同尺寸的T型连接件(T-stub),进行了单调加载试验研究。通过对试件的翼缘板厚度、腹板厚度、螺栓间距、螺栓孔径尺寸、螺栓尺寸、螺栓强度等参数的变化来考察T-stub的力学性能,明确T-stub的应力分布、塑性发展、变性特点和破坏模式。(2)对比试验数据,建立T-stub的有限元模型,提出T-stub的初始抗拉刚度的表达式。(3)设计了两组带外伸端板加劲肋的中柱节点,进行单调加载试验,建立相应的有限元模型,重点分析外伸端板加劲肋对整个节点域力学性能的影响,明确板内的应力流发展方向,提出外伸端板加劲肋的初始抗拉刚度表达式。(4)设计五组常见的中柱节点,三组强轴裸节点(包括第三项中所提到的两组中柱节点)两组弱轴裸节点,进行单调加载试验,研究了每组节点域相关组件的受力特性。(5)结合中柱节点的试验分析结果,对五组节点的节点域部分进行组件拆分,建立每一个组件的初始抗拉刚度模型,明确提出每组组件的刚度的计算方法,给出每组中柱节点的弹簧组合方法。(6)建立基于弹簧单元的Abaqus有限元分析模型,对第五项中的组件的弹簧刚度以及弹簧组合方法进行验证。(7)结合弹簧单元算法给出不同节点形式的初始转动刚度计算方法,对组件法流程进行了规范总结,具体给出了较为准确的组件模型的提取方法,边界条件的设定方法,以及力学弹簧的组合方法,并对理论结果同试验结果产生的误差进行了分析研究。
[Abstract]:Liang Zhu joints are usually assumed to be ideal rigid joints or hinged joints in conventional structural design. With the increasing research on steel structure joints, many scholars at home and abroad have made more and more research on them.The academic circles generally think that steel joints have certain rotational stiffness.The research of steel structure joints is mainly divided into three methods: experimental study, finite element analysis and component method.Up to now, the component method is mainly used in the analysis of the structural performance of the conventional components in the form of conventional nodes, and there are still some deficiencies in the performance analysis of some special components.With the rapid development of steel structure in the construction industry, more and more joints have been applied in multi-high-rise steel frame structures.It is more and more important to estimate the performance of the node, and the modification and improvement of the component method in this respect is also necessary.In this paper, ten groups of T-joints with different sizes are designed from the following aspects: 1) T-stubs are designed, and the monotone loading tests are carried out.The mechanical properties of T-stub were investigated by analyzing the thickness of flange plate, the thickness of web plate, the spacing of bolts, the size of bolt aperture, the size of bolt and the strength of bolt. The stress distribution and plastic development of T-stub were determined.In this paper, the finite element model of T-stub is established, and the expression of initial tensile stiffness of T-stub is put forward. Two groups of mid-column joints with stiffening rib with extended endplate are designed and tested by monotone loading.The corresponding finite element model is established to analyze the influence of the stiffening rib on the mechanical properties of the whole joint domain, and the development direction of the stress flow in the plate is clarified.In this paper, the expression of initial tensile stiffness of stiffening ribbed plates is presented. (4) five groups of common mid-column joints are designed, and three groups of strong shaft bare joints (including two groups of mid-column joints mentioned in item 3) are designed to carry out monotone loading tests.In this paper, the mechanical characteristics of each group of related components in the node domain are studied. Combined with the experimental results of the column joints, the components of the five groups of joints are split, and the initial tensile stiffness model of each component is established.The method of calculating the stiffness of each group of components is put forward, and the method of spring combination of column joints in each group is given. (6) the Abaqus finite element analysis model based on spring element is established.The spring stiffness and spring combination method of component in item 5 are verified. 7) combined with spring element algorithm, the calculation method of initial rotational stiffness of different node forms is given, and the flow of component method is summarized.The more accurate method of extracting component model, the method of setting boundary condition and the method of combination of mechanical spring are given, and the error between the theoretical results and the experimental results is analyzed and studied.
【学位授予单位】：华南理工大学
【学位级别】：博士
【学位授予年份】：2015
【分类号】：TU391

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