An Initially Deformed Flat Frame Finite Element

Archives of civil engineering

J. ZamorowskiCorresponding authorSilesian University of Technology in Gliwice, Faculty of Civil Engineering, 5 Akademicka Street, 44-100 Gliwice, PolandEmailOther articles by this author:De Gruyter OnlineGoogle Scholar¹ 

[1] Silesian University of Technology in Gliwice, Faculty of Civil Engineering, 5 Akademicka Street, 44-100 Gliwice, Poland

关键词: Keywords: initially deformed flat frame element;    geometrical non-linearity;    large displacements;    large and small rotations;   

DOI  :  10.2478/ace-2013-0021

学科分类：建筑学

来源: Polska Akademia Nauk * Instytut Podstawowych Problemow Techniki / Polish Academy of Sciences, Institute of Fundamental Technological Research

【 摘 要 】

The paper presents the author’s non-linear FEM solution of an initially stressless deformed flat frame element, in which the nodes are situated along the axis of the bar initially straight. It has been assumed that each node may sustain arbitrary displacements and rotation. The solution takes into account the effect of shear, the geometrical non-linearity with large displacements (Green-Lagrange’s strain tensor) and moderate rotations (i.e. such ones which allow a linear-elastic behaviour of the material) and alternative small rotations when the second Piola-Kirchhoff stress tensor is applied. This solution is based on [1], concerning beams without any initial bow imperfections. The convergence of the obtained results at different numbers of nodes and Gauss points in the element was tested basing on the example of circular arcs with a central angle of 120° ÷180°. The analysis concerned elements with two, three, five, seven, nine and eleven nodes, for the same number of points of numerical integration and also with one more or less. Moreover, the effect of distributing the load on the convergence of the results was analyzed.

【 授权许可】

Unknown