Design of built-up steel beam-columns composed of two-channel sections

2020 ◽  
Author(s):  
George Iskander ◽  
Emam Soliman ◽  
Ezzeldin Yazeed Sayed-Ahmed
Keyword(s):  
Experimental Investigation ◽  
Numerical Model ◽  
Experimental Work ◽  
Parametric Study ◽  
Design Method ◽  
Steel Beam ◽  
Fe Model ◽  
Beam Columns ◽  
Initial Imperfections ◽  
Good Agreement

Built-up columns composed of two chords present an ideal design for long columns subject to high straining actions. The objective of this paper is to investigate the capacity of built-up columns composed of two-channel sections subjected to eccentric loading and propose a design method for them. A nonlinear numerical FE model is developed for these columns and verified against experimental investigation available from literature; the model includes both the geometric and materials nonlinearities along with the effect of initial imperfections. The model is used to perform a parametric study to investigate the effect of different factors on the built-up columns’ capacity. The results of the parametric study are also used to propose a design method for these columns. A limited experimental investigation is performed on two eccentrically loaded built-up columns, the results of experimental work showed good agreement with the numerical model results and the proposed design method.

Inelastic lateral buckling of steel beam–columns

1986 ◽  
Vol 13 (6) ◽  
pp. 693-699 ◽  
Author(s):  
P. E. Cuk ◽  
M. A. Bradford ◽  
N. S. Trahair
Keyword(s):  
Structural Engineering ◽  
Design Method ◽  
Elastic Beam ◽  
Steel Beam ◽  
Lateral Buckling ◽  
Inelastic Buckling ◽  
Beam Columns ◽  
Moment Gradient ◽  
Key Words Beams ◽  
Good Agreement

A series of investigations of the inelastic lateral buckling behaviour of steel beam–columns is described. These originate from many previous studies of the elastic lateral buckling of beams. It was found that present methods of predicting the effects of moment gradient in elastic beam–columns are unnecessarily conservative, and it was concluded that many practical continuous beam–columns will have significant warping restraints.Fourteen inelastic lateral buckling tests were carried out on 9 continuous steel beam–columns. The results of these tests were compared with predictions made by a new and improved finite element computer method of analyzing inelastic buckling, and very good agreement was found. The analytical method was then used to develop a simple approximation for predicting the inelastic buckling of isolated beam–columns with unequal end moments, and a design method was proposed. Key words: beams, buckling, columns, flexure, residual stresses, steel, structural design, structural engineering, torsion.

A Numerical and Experimental Investigation of Low-conductivity Unglazed, Transpired Solar Air Heaters

2005 ◽  
Vol 127 (1) ◽  
pp. 153-155 ◽  
Author(s):  
Keith Gawlik ◽  
Craig Christensen ◽  
Charles Kutscher
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Experimental Investigation ◽  
Experimental Work ◽  
Experimental Results ◽  
Flow Conditions ◽  
Numerical Work ◽  
Plate Geometry ◽  
Modeling Flow ◽  
Good Agreement

The performance of low-conductivity unglazed, transpired solar collectors was determined numerically and experimentally. The numerical work consisted of modeling flow conditions, plate geometries, and plate conductivities with modified commercial computational fluid dynamics software, and the experimental work compared the performance of two plate geometries made with high and low conductivity materials under a variety of flow conditions. Good agreement was found between the numerical and experimental results. The results showed that for practical low-conductivity materials, performance differed little from the equivalent plate geometry in high-conductivity material.

Parametric study on austenitic stainless steel beam-columns with hollow sections under fire

2019 ◽  
Vol 152 ◽  
pp. 274-283 ◽  
Author(s):  
Nuno Lopes ◽  
Mónica Manuel ◽  
Ana Regina Sousa ◽  
Paulo Vila Real
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Parametric Study ◽  
Steel Beam ◽  
Beam Columns

Experimental Investigation of Steel Beam-Columns under Fire Loading

2010 ◽  
Author(s):  
Lisa Choe ◽  
Amit H. Varma ◽  
Anil Agarwal ◽  
Andrea Surovek
Keyword(s):  
Experimental Investigation ◽  
Steel Beam ◽  
Beam Columns ◽  
Fire Loading

Residual Strength of Tubular Columns With Localized Thickness Loss

2021 ◽  
Author(s):  
Mostafa Atteya ◽  
Ove Mikkelsen ◽  
Narve Oma ◽  
Gerhard Ersdal
Keyword(s):  
Finite Element ◽  
Numerical Model ◽  
Experimental Work ◽  
Nonlinear Finite Element ◽  
Ultimate Capacity ◽  
Axial Loads ◽  
Element Analysis ◽  
Tubular Columns ◽  
Nonlinear Finite Element Methods ◽  
Good Agreement

Abstract This paper provides a comprehensive finite element analysis to investigate the ultimate capacity of corroded members under concentric axial loads. The paper investigates previous experimental work on stocky and slender tubular columns with simulated patch corrosion and provides a numerical model that can estimate the columns capacities. Further, a parametric study is performed to investigate the effect of geometric parameters such as location, height, and width of corrosion patch on the ultimate capacity of corroded columns. Finally, the paper presents a comparison between laboratory tests to the formulae of superseded standards and numerical analysis using nonlinear finite element methods. The numerical model proposed in this paper show good agreement with the results from the experimental work.

Seakeeping Behavior of an Innovative, Twin-Hull LNG-FPSO Design During Side by Side Offloading Operations: A Numerical and Experimental Investigation

2018 ◽  
Author(s):  
Georgios Gkikas
Keyword(s):  
Experimental Investigation ◽  
Numerical Model ◽  
Numerical Realization ◽  
Lessons Learned ◽  
Hydrodynamic Performance ◽  
Mooring System ◽  
Time Domain Simulation ◽  
Response Amplitude Operators ◽  
The Time Domain ◽  
Good Agreement

A numerical and experimental investigation is performed with respect to the seakeeping behavior of a prototype, twin-hull, LNG-FPSO and its hydromechanic interactions with the offtake (LNG) shuttle carrier during Side-by-Side offloading. The numerical model describing the SbS mooring system as well as the assumptions and calibration steps made towards the development of a robust numerical realization are presented herewith. Following calibration, the numerical model was tested against dedicated seakeeping experiments in order to assess the effectiveness of the proposed approach as well as the hydrodynamic performance of the overall offloading system. For a more realistic offloading-scenario case, three-component, i.e., wave, wind and current, offloading environments were used for validation purposes. For the time domain simulation, as far as the hydrodynamic (diffraction) database is concerned, the multibody response amplitude operators are implemented directly, instead of employing retardation functions, in order to observe whether such an approach can still yield robust results for such complicated hydromechanic system. Statistics of the relative motions between the LNG-FPSO and LNGC manifolds, fender loads and lines’ tensions are obtained and presented, illustrating the good agreement between numerical and experimental results. Lessons learned and further recommendations are subsequently summarized and stated.

FINITE ELEMENT MODELING OF STEEL-CONCRETE COMPOSITE BEAMS STRENGTHENED WITH PRESTRESSED CFRP PLATE

2012 ◽  
Vol 12 (01) ◽  
pp. 23-51 ◽  
Author(s):  
R. EL-HACHA ◽  
P. ZANGENEH ◽  
H. Y. OMRAN
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Parametric Study ◽  
Large Scale ◽  
Composite Beams ◽  
Experimental Results ◽  
Fe Model ◽  
Element Modeling ◽  
Cfrp Plate ◽  
Good Agreement

Results from finite element modeling (FEM) of large-scale steel-concrete composite beams strengthened in flexure with prestressed carbon fiber-reinforced polymer (CFRP) plate were validated with experimental results and presented in this paper. The effect of varying the level of prestressing as percentage of the ultimate tensile strength of the CFRP plate was investigated. Comparison was carried out in terms of overall load-deflection behavior, strain profile along the length of the CFRP plate, and strain distribution across the depth of the beam at mid-span section. Very good agreement was observed between the finite element (FE) and the experimental results. The validated FE models were used to perform a comprehensive parametric study to investigate the changes in the behavior through wider range of prestressing levels and then, determine the optimum prestressing level that maintain the unstrengthened beams' original ductility (or energy absorption). An iterative analytical model was also developed, validated with both the FE model and the experimental results, and showed good agreement. A parametric study was carried out to investigate the effect of changing the yield strength of the steel and the concrete compressive strength on the moment of resistance of the section and the strain in the CFRP plate at ultimate.

Numerical and Experimental Investigation of Thermodynamic Behavior of Positive Displacement Compressor

2010 ◽  
Author(s):  
Morad Paknezhad ◽  
Tooraj Yousefi ◽  
Sajjad Sadeghi ◽  
Mehran Ahmadi
Keyword(s):  
Experimental Investigation ◽  
Numerical Model ◽  
Angular Velocity ◽  
Thermodynamic Analysis ◽  
Experimental Results ◽  
Thermodynamic Behavior ◽  
Outlet Pressure ◽  
Positive Displacement ◽  
Fluent Software ◽  
Good Agreement

A numerical model, based on dynamic mesh, has been developed by FLUENT software, to simulate behavior of a positive displacement compressor. Only first compression stage of compressor was modeled. Modeling was done, by dividing the domain to three areas with different type meshes. Some relations were presented for volumetric, mechanical, isothermal, and overall isothermal performance, and thermodynamic analysis has been performed in term of these relations. Effects of outlet pressure and crankshaft’s angular velocity have been investigated on work, polytropic factor of compression, and efficiency. Numerical and experimental results have been compared, and a good agreement was seen between them.

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