scholarly journals Finite Element Models for Thin-Walled Steel Member Connections

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Sandesh R. Acharya ◽  
K. S. Sivakumaran
Keyword(s):  
Finite Element ◽  
Sheet Steel ◽  
Finite Element Models ◽  
Element Analysis ◽  
Shell Elements ◽  
Analysis And Design ◽  
Steel Members ◽  
Nonlinear Stress ◽  
Thin Walled ◽  
Hot Rolled

The behavior of connections associated with the thin-walled steel members is distinctly different from that of hot-rolled steel connections, primarily because of the flexibility of the plates. A typical cold-formed steel structural construction may entail such numerous connections. The incorporation of large number of such connections in an analysis and design, using sophisticated finite element models, is very tedious and time consuming and may present computational difficulties. The objective of this investigation is to create simplified, yet reasonably accurate, finite element models for the analysis of screw connections and bolted connections associated with thin-walled sheet steel construction. The primary plates were modeled using quadrilateral shell elements, and nonlinear stress-strain relationship was established based on experiments. The fasteners were modeled as an elastic medium. The plate-to-plate interactions and the plate-to-screw interactions were incorporated using contact elements. The study considered two finite element models of different complexity. The performance of these models was established through comparisons with the corresponding experimental results. The finite element analysis results exhibit reasonably good agreement with the test results in terms of connection stiffness, screw tilting, end curling, and average longitudinal strain. The recommended simplified connection model is capable of reproducing the behavior of sheet steel screw and bolt connections.

Nonorthogonal solution for thin-walled members – applications and modelling considerations

2006 ◽  
Vol 33 (4) ◽  
pp. 440-450 ◽  
Author(s):  
R Emre Erkmen ◽  
Magdi Mohareb
Keyword(s):  
Finite Element ◽  
Beam Theory ◽  
Companion Paper ◽  
Finite Element Models ◽  
Element Analysis ◽  
Steel Members ◽  
Longitudinal Stiffeners ◽  
Thin Walled ◽  
Shell Finite Element ◽  
Orthogonal Coordinates

In a companion paper (R.E. Erkmen and M. Mohareb. 2006. Canadian Journal of Civil Engineering, 33: 421–439.), three finite elements based on the Vlasov thin-walled beam theory were formulated using a nonorthogonal coordinate system. Although the associated derivations are more elaborate than in more conventional solutions based on orthogonal coordinates, the new elements offer more modelling capabilities and flexibility in modelling structural steel members, a feature that is illustrated in this paper. In this context, the current paper presents four details in steel construction that were conveniently modelled within the new solution scheme. The applications involve thin-walled members with coped flanges, rectangular holes reinforced with longitudinal stiffeners, and eccentric supports. Comparisons with established shell finite element models using ABAQUS suggest the validity of the new solution. Key words: open sections, finite element analysis, thin-walled members, coped flanges, rectangular holes, eccentric supports.

Finite Element Analysis on the Local Buckling Behavior of High Strength Steel Members under Axial Compression

2011 ◽  
Vol 243-249 ◽  
pp. 1477-1482 ◽  
Author(s):  
Gang Shi ◽  
Cuo Cuo Lin ◽  
Yuan Qing Wang ◽  
Yong Jiu Shi ◽  
Zhao Liu
Keyword(s):  
Finite Element ◽  
Axial Compression ◽  
High Strength Steel ◽  
Local Buckling ◽  
High Strength ◽  
Finite Element Models ◽  
Loading Capacity ◽  
Element Analysis ◽  
Steel Members ◽  
Buckling Behavior

Compared to the ordinary strength steel extensively applied in structures currently, high strength steel, a new kind of construction material, has many differences on mechanical properties. Though high strength steel has been applied in several projects in the world, which has obtained good effects, there is a lack of the design method for high strength steel structures and researches on the loading capacity of high strength steel members. To study the local buckling behavior of high strength steel members under axial compression, finite element models are developed to predict the loading capacity of high strength steel welded I-section and box-section stub columns under axial compression in this paper. With accurate simulation of 17 high strength steel specimens, the finite element analysis results agree well with the corresponding test results, and the average deviation of the ultimate loading capacity of 17 specimens is about -3.1%. It’s verified that the finite element models developed in this paper can accurately simulate high strength steel members with the initial geometric imperfections and residual stresses, and analyze the local buckling behavior of high strength steel members under axial compression. In addition, it provides a basis for the parametric study of high strength steel members under axial compression in future.

Finite Element Analysis and Mechanical Testing of External Fixator Designs

1994 ◽  
Vol 208 (2) ◽  
pp. 103-110 ◽  
Author(s):  
P J Prendergast ◽  
S J Toland ◽  
J P Corrigan
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Finite Element Models ◽  
Close Correspondence ◽  
Element Analysis ◽  
Modular Assembly ◽  
Shell Elements ◽  
Fixation Devices ◽  
Stress Patterns ◽  
Theoretical Stress

Experimental and theoretical stress analysis methods are used to evaluate the mechanical behaviour of external fixation devices as load-bearing structures. For the experimental part, a modular assembly was fabricated from which unilateral and bilateral fixators of different design configurations were assembled and tested under various loading conditions. A reflective photoelasticity technique was used to study the effect of frame configuration on the stress patterns generated around the pin-bone interface. Finite element models of each design were also generated using three-dimensional beam and shell elements. Spring elements were used to model the pin/sidebar clamp. It is shown that close correspondence between the experimental and theoretical methods of investigation is obtained when the flexibility of the pin/side-bar clamp is taken into account. It is also shown that a unilateral design, modified by attaching a second side-bar to the first and connecting them by means of a semicircular component, can achieve some of the structural advantages of bilateral fixators without the clinical disadvantage of transfixing pins.

Lateral Torsional Buckling of Thin-Walled Cold-Formed Steel Beams with Web Holes - Finite Element Analysis

2013 ◽  
Vol 467 ◽  
pp. 425-430 ◽  
Author(s):  
Martin Horacek ◽  
Jindrich Melcher
Keyword(s):  
Finite Element ◽  
Fem Analysis ◽  
Steel Beams ◽  
Engineering Practice ◽  
Lateral Torsional Buckling ◽  
Torsional Buckling ◽  
Element Analysis ◽  
Analysis And Design ◽  
Bending Resistance ◽  
Thin Walled

This paper deals with the problems of analysis and design of thin-walled steel beams with circular web holes. The analysis based on the finite element method modeling is being performed on the case of perforated Sigma beams used in the storage systems and expedient flooring structures. The Sigma beams are generally used as floor girders which are subjected to the bending. In some cases the beams are not laterally restraint and the effect of lateral torsional buckling may occur. In the current engineering practice several design procedures are used to determine the bending resistance with respect to lateral torsional buckling. In this paper the results of FEM analysis are compared with the bending resistances calculated according the Eurocodedesign procedure.

Finite Element Analysis on the Vibration Mode of Composite Thin-Walled Box Beam with Double-Cell Sections

2012 ◽  
Vol 569 ◽  
pp. 495-499
Author(s):  
Shuang Shuang Sun ◽  
Fang Wu Jia ◽  
Yong Sheng Ren
Keyword(s):  
Finite Element ◽  
Width Ratio ◽  
Finite Element Models ◽  
Modal Shape ◽  
Element Analysis ◽  
Finite Element Software ◽  
Box Beam ◽  
Box Beams ◽  
Length Width ◽  
Thin Walled

The modal analysis of composite thin-walled box beams with double-cell sections is carried out by the finite element software ANSYS. The finite element models are established first for the double-cell composite thin-walled box beams, then the vibration modes of two box beams: Circumferentially Uniform Stiffness (CUS) and Circumferentially Antisymmetric Stiffness (CAS) are calculated and analyzed. The effects of length-width ratio and width-height ratio on the natural frequency and the modal shape of the double-cell composite thin-walled box beams are discussed.

Finite Element Analysis of Automotive Structures Based on Simplified Models

1996 ◽  
Author(s):  
Xiaodong D. Tang ◽  
Chiming Lu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Development Stage ◽  
Finite Element Models ◽  
Static Stiffness ◽  
Simplified Models ◽  
Element Analysis ◽  
Beam Elements ◽  
Automotive Structures ◽  
Thin Walled

Abstract This paper presents finite element analysis (FEA) of simplified automotive structures using beam-like elements. The concept is to perform FEA quickly or at early product development stage in order to guide the design process. Two types of finite element models are studied: 1) simplified models which use beam elements to model beam-like components and use other elements for the rest of the vehicle parts such as joints, engines and roofs; 2) thin-walled beam models which purely use thin-walled beam elements. The static stiffness, modal and crash analyses are conducted and the correlation of the results with those from conventional methods are provided.

A Finite Element Analysis of the General Rolling Contact Problem for a Viscoelastic Rubber Cylinder

1988 ◽  
Vol 16 (1) ◽  
pp. 18-43 ◽  
Author(s):  
J. T. Oden ◽  
T. L. Lin ◽  
J. M. Bass
Keyword(s):  
Finite Element ◽  
Variational Principles ◽  
Standing Waves ◽  
Rolling Contact ◽  
Finite Element Models ◽  
Viscoelastic Cylinder ◽  
Element Analysis ◽  
Elastic Rubber ◽  
Frictional Effects ◽  
Rough Foundation

Abstract Mathematical models of finite deformation of a rolling viscoelastic cylinder in contact with a rough foundation are developed in preparation for a general model for rolling tires. Variational principles and finite element models are derived. Numerical results are obtained for a variety of cases, including that of a pure elastic rubber cylinder, a viscoelastic cylinder, the development of standing waves, and frictional effects.

scholarly journals The biomechanical effect on the adjacent L4/L5 segment of S1 superior facet arthroplasty: a finite element analysis for the male spine

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Zewen Shi ◽  
Lin Shi ◽  
Xianjun Chen ◽  
Jiangtao Liu ◽  
Haihao Wu ◽  
...  
Keyword(s):  
Finite Element ◽  
Range Of Motion ◽  
Facet Joint ◽  
Adjacent Segment ◽  
Finite Element Models ◽  
Level Of Evidence ◽  
Element Analysis ◽  
Flexion Extension ◽  
Biomechanical Effect ◽  
Lumbar Range Of Motion

Abstract Background The superior facet arthroplasty is important for intervertebral foramen microscopy. To our knowledge, there is no study about the postoperative biomechanics of adjacent L4/L5 segments after different methods of S1 superior facet arthroplasty. To evaluate the effect of S1 superior facet arthroplasty on lumbar range of motion and disc stress of adjacent segment (L4/L5) under the intervertebral foraminoplasty. Methods Eight finite element models (FEMs) of lumbosacral vertebrae (L4/S) had been established and validated. The S1 superior facet arthroplasty was simulated with different methods. Then, the models were imported into Nastran software after optimization; 500 N preload was imposed on the L4 superior endplate, and 10 N⋅m was given to simulate flexion, extension, lateral flexion and rotation. The range of motion (ROM) and intervertebral disc stress of the L4-L5 spine were recorded. Results The ROM and disc stress of L4/L5 increased with the increasing of the proportions of S1 superior facet arthroplasty. Compared with the normal model, the ROM of L4/L5 significantly increased in most directions of motion when S1 superior facet formed greater than 3/5 from the ventral to the dorsal or 2/5 from the apex to the base. The disc stress of L4/L5 significantly increased in most directions of motion when S1 superior facet formed greater than 3/5 from the ventral to the dorsal or 1/5 from the apex to the base. Conclusion In this study, the ROM and disc stress of L4/L5 were affected by the unilateral S1 superior facet arthroplasty. It is suggested that the forming range from the ventral to the dorsal should be less than 3/5 of the S1 upper facet joint. It is not recommended to form from apex to base. Level of evidence Level IV

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