| 高温下钢及组合钢节点有限元建模及基于构件的分析方法（英文） |
| |
| 作者姓名： | TAN Kang-hai |
| |
| 作者单位： | Professor and Director of Protective Technology Research Centre （PTRC）, School of Civil and Environmental Engineering, Nanyang Technological University, Singapore 639798 |
| |
| 摘 要： | 欧洲规范EC3 Part 1-1第5章1]允许工程师使用一些先进的有限元分析软件来分析和设计钢结构,如线弹性、刚塑性以及二阶弹塑性整体分析。这3种极不相同的分析方法,能够用于简支、半连续以及连续节点模型中2]。节点模型根据刚度的不同,可分为铰接、半刚性和刚性模型;按照强度的不同,可分为铰接、部分强度和全强度模型。尽管大多数的工程问题仅仅要求进行线弹性分析,但仍有一些特殊结构可能要求采用高级分析以降低施工成本,例如底层无支撑钢框架结构。在这种结构中,采用半连续节点（具有半刚度和部分强度特性）进行框架分析,会显著增强结构抵抗名义水平荷载、风荷载、整体缺陷、地震作用时的抗侧刚度和强度,因此在控制的水平荷载下计算的横向侧移可能在EC3允许的范围内。在基于性能的抗火设计中,结构抗火工程师可能想利用钢节点潜在的刚度和强度,尤其是有端板节点的钢结构,这是一种最常见的钢结构施工形式。端板可以是部分深度的,或者是延伸端板,涵盖了名义铰接、半刚性和完全刚性节点模型。本文给出了端板节点高温性能研究的一系列数值分析结果;应用基于构件的方法,建立了这些节点在高温下的力学反应计算公式,以及梁腹板剪应力分量、连接处的拉应力和压应力区域的力学模型。基于构件的方法能够考虑钢节点的热约束效应。对已有钢端板节点试验进行了有限元模拟和基于构件的分析表明,2种方法的分析结果与试验结果的偏差都是可接受的,包括热约束效应。
|
| 关 键 词： | 结构抗火 基于构件的方法 钢节点 组合钢节点 钢连接 节点抗火测试 |
Finite Element Modeling and Component-based Approach of Steel and Composite Steel Joints at Elevated Temperatures |
| |
| TAN,Kang-hai.Finite Element Modeling and Component-based Approach of Steel and Composite Steel Joints at Elevated Temperatures[J].Journal of Seismology,2012(3):253-266. |
| |
| Authors: | TAN Kang-haiProfessor and Director of Protective Technology Research CentrePTRC |
| |
| Institution: | TAN Kang-hai(Professor and Director of Protective Technology Research Centre(PTRC),School of Civil and Environmental Engineering,Nanyang Technological University,Singapore 639798) |
| |
| Abstract: | EC3 Part 1-1 Chapter 5 1] allows engineers to use a suite of advanced finite element analysis software to analyze and design steel structures,namely,linear elastic,rigid-plastic and second-order elastic-plastic global analysis.These three broadly different types of analysis can incorporate simple,semi-continuous and continuous joint models 2].In terms of stiffness,the joint models can be nominally pinned,semi-rigid or rigid and in terms of strength,they can be classified as nominally pinned,partial-strength or full-strength.While the majority of engineering problems only require linear elastic analysis,there are some special structures that may require advanced analysis to reduce construction cost,for example,in the design of low-rise unbraced steel framed structures.In this context,the incorporation of semi-continuous joints（with semi-rigid and partial-strength characteristics） into frame analysis can significantly enhance structural stiffness and strength against sway arising from notional horizontal loads,wind loads,global imperfections or seismic action.This is so that the computed lateral drift under governing horizontal loads may be acceptable within the EC 3 stipulations.In the context of performance-based approach for some fire scenarios,structural fire engineers may want to utilize the inherent stiffness and strength of steel joints,particularly for steel structures with end-plate joints,which is the most common form of steel construction.The end plates may range from partial-depth,flush to extended end plates,covering nominally-pinned,semi-rigid and fully rigid joint models.This paper presents a series of numerical and analytical investigations to study the behavior of end plate joints at elevated temperatures.Applying a ＂component-based＂ methodology,the mechanical response of these joints at elevated temperatures has been formulated,incorporating the beam web shear component,and the tension and compression zones of the connection.The component-based approach can consider the effect from thermal restraint on steel joints.Finite element simulations of the steel end plate joint tests were also performed and both the component-based and numerical finite element predictions provide acceptable correlations with the test behavior,including the effect of thermal restraint. |
| |
| Keywords: | structural fire resistance component-based approach steel joints composite steel joints steel connections fire tests on joints |
| 本文献已被 维普 等数据库收录！ |
|
