钢结构平齐端板连接数值模拟和实用计算方法研究
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摘要
端板连接是国内外普遍采用的节点连接形式之一,但各国规范的计算方法不尽相同。在我国,规范对端板连接的计算模型和方法没有明确的计算方法规定,只有构造要求规定,导致在实际钢结构设计中无规范可依。本文以为平齐端板连接节点设计时提供改进的计算力学模型和计算方法为目的,采用三维有限元模型对平齐端板连接节点的影响因素进行了参数分析,研究了这种连接形式的传力路径,并在对国内外现有模型分析的基础上,建立了改进的平齐端板连接的力学模型和计算方法,为我国钢结构平齐端板连接的设计提供了参考和依据。
为此,论文进行了如下研究工作。
(1)通过文献检索,将各国规范的计算方法归纳为两类,分别以欧洲规范(EC3)和德国规范(DIN18800)为代表。分析了这两种模型的力学模型,传力路径和计算方法。
(2)采用三维有限元分析软件-ANSYS建立了端板连接的实体有限元模型,并通过试验对该模型的有效性进行了验证。试验和有限元的结果对比说明,包含有螺栓预拉力和接触分析的实体模型能够很好的模拟实际情况。
(3)采用验证后的有限元模型对端板连接节点进行了端板厚度、加劲肋厚度、螺栓到上翼缘距离及螺栓到腹板的距离等的参数分析,分析了平齐端板连接节点的影响因素和传力路径。
(4)建立了改进的平齐端板连接力学模型和计算方法。该计算方法比德国规范(DIN18800)和欧洲规范(EC3)具有更高的精度,其计算结果更接近实际情况。
(5)通过工程实例说明了这种改进的力学模型和计算方法在实际工程中的应用。为我国钢结构节点设计提供有价值的参考和依据。
End-plate connection is one of the most widely used joint configurations at home and abroad, but it does not have a unified calculation method. In china, there is no clear calculation method of end-plate connections, only to meet the constructional details’requires, resulted that there is no codes to refer to. The purpose of this paper is to provide a simplified method for the designer who designs high strength bolted flush end-plate connections, conduct parametric analysis of the influence factors of flush end-plate connections by using three-dimensional finite element model, study the transmission path of this connection forms, base on the result of analysis the existing models at home and abroad, establish an improved mechanical model and calculation method, provide a reference and a basis for the design of flush end-plate connections.
So this paper carried on the following research work.
(1) Through the literature search, the calculation method of national standard will be grouped into two categories, Respectively Eurocode (EC3) and the German standards (DIN18800) as the representative. Analyze the mechanical model, transmission path and the calculation method of the two model.
(2) Establish the FEA model of end-plate connections by using three dimensional finite element model ANSYS, and the validity of the model has been verified through test. Comparing the results of test and FEA shows that the model which contains a bolt pre-tension and contact analysis can simulate the actual situation well.
(3) Parametric analysis of end-plate connections by using validated finite element model, the parametric are end-plate thickness, stiffening ribs thickness, the distance from bolts to the flange and bolts to the web, analyze the influence factors and the load transfer path of flush end-plate connections nodes.
(4) Establish an improved mechanical model and calculation method of flush end-plate connections. This calculation method had higher accuracy than both the German standard and the Eurocode, the design results are closer to the actual situation.
(5) Show the application of the improved mechanical model and calculation method in practical project through engineering examples. Provide a valuable reference for the steel nodes design of China.
为此,论文进行了如下研究工作。
(1)通过文献检索,将各国规范的计算方法归纳为两类,分别以欧洲规范(EC3)和德国规范(DIN18800)为代表。分析了这两种模型的力学模型,传力路径和计算方法。
(2)采用三维有限元分析软件-ANSYS建立了端板连接的实体有限元模型,并通过试验对该模型的有效性进行了验证。试验和有限元的结果对比说明,包含有螺栓预拉力和接触分析的实体模型能够很好的模拟实际情况。
(3)采用验证后的有限元模型对端板连接节点进行了端板厚度、加劲肋厚度、螺栓到上翼缘距离及螺栓到腹板的距离等的参数分析,分析了平齐端板连接节点的影响因素和传力路径。
(4)建立了改进的平齐端板连接力学模型和计算方法。该计算方法比德国规范(DIN18800)和欧洲规范(EC3)具有更高的精度,其计算结果更接近实际情况。
(5)通过工程实例说明了这种改进的力学模型和计算方法在实际工程中的应用。为我国钢结构节点设计提供有价值的参考和依据。
End-plate connection is one of the most widely used joint configurations at home and abroad, but it does not have a unified calculation method. In china, there is no clear calculation method of end-plate connections, only to meet the constructional details’requires, resulted that there is no codes to refer to. The purpose of this paper is to provide a simplified method for the designer who designs high strength bolted flush end-plate connections, conduct parametric analysis of the influence factors of flush end-plate connections by using three-dimensional finite element model, study the transmission path of this connection forms, base on the result of analysis the existing models at home and abroad, establish an improved mechanical model and calculation method, provide a reference and a basis for the design of flush end-plate connections.
So this paper carried on the following research work.
(1) Through the literature search, the calculation method of national standard will be grouped into two categories, Respectively Eurocode (EC3) and the German standards (DIN18800) as the representative. Analyze the mechanical model, transmission path and the calculation method of the two model.
(2) Establish the FEA model of end-plate connections by using three dimensional finite element model ANSYS, and the validity of the model has been verified through test. Comparing the results of test and FEA shows that the model which contains a bolt pre-tension and contact analysis can simulate the actual situation well.
(3) Parametric analysis of end-plate connections by using validated finite element model, the parametric are end-plate thickness, stiffening ribs thickness, the distance from bolts to the flange and bolts to the web, analyze the influence factors and the load transfer path of flush end-plate connections nodes.
(4) Establish an improved mechanical model and calculation method of flush end-plate connections. This calculation method had higher accuracy than both the German standard and the Eurocode, the design results are closer to the actual situation.
(5) Show the application of the improved mechanical model and calculation method in practical project through engineering examples. Provide a valuable reference for the steel nodes design of China.
引文
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3 M. A. G. Coelho, S. K. F. Bijlaard. Experimental Behaviour of High Strength Steel End-plate Connections. Journal of Constructional Steel Research, 2007, 63(7): 1228-1240
4楼国彪,李国强,雷青.钢结构高强度螺栓端板连接研究现状(II).建筑钢结构进展, 2006, 8(3): 16-23
5 L. F. L. Ribeiro, R. M. Goncalves, C. A. Castiglioni. Beam-to-column End Plate Connections– An Experimental Analysis. J. Construct. Steel Res, 1998, 46(1): 264-266
6 C. Faella, V. Piluso, G. Rizzano. A New Method to Design Extended End Plate Connections and Semi-rigid Braced Frames. J. Construct. Steel Res, 1997, 41(1): 61-91
7刘晓辉,刘增科,韩毅.半刚性端板连接节点有限元模拟分析.山西建筑, 2008, 34(1): 78-79
8 A. Abolmaali, J. H. Matthys, F. Mohammed, Y. Choi. Development of Moment Rotation Model Equations for Flush End-plate Connections. Journal of Constructional Steel Research, 1995, 61(3): 1592-1612
9石文龙.平端板连接半刚性梁柱组合节点的试验与理论研究. [同济大学博士学位论文].同济大学, 2005: 1-27
10魏勇.端板厚度对梁柱板端节点连接刚度的影响研究.中国水运, 2007, 5(1): 85-86
11郭健,何益斌,黄频,等.端板连接节点中端板强度计算.湖南大学学报, 2008, 35(2): 13-16
12张成雷.端板连接中端板反力计算理论的探讨.黑龙江水专学报, 2006, 33(4):66-67
13张利娟,石建军.对钢结构端板连接节点设计方法的探析.南华大学学报, 2002, 16(2): 52-55
14崔跃军.钢结构主次梁连接节点的设计.企业技术开发, 2007, 26(6): 55-57
15 Y. J. Shi, G. Shi, Y. Q. Wang. Experimental and Theoretical Analysis of the Moment–rotation Behaviour of Stiffened Extended End-plate Connections. Journal of Constructional Steel Research, 2007, 63(9): 1279-1293
16李国强,石文龙.平端板连接半刚性梁柱组合节点的抗弯承载力Ⅰ:负弯矩作用.土木工程学报, 2007, 40(9): 23-29
17 T. Q. Li, D. A. Nethercot, B. S. Choo. Behaviour of Flush End-plate Composite Connections with Unbalanced Moment and Variable Shear/Moment Ratios-I. Experimental Behaviour. J. Construct. Steel Res, 1996, 38(2): 125-164
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