scholarly journals SLENDER THIN‐WALLED BOX COLUMNS SUBJECTED TO COMPRESSION AND BENDING

2010 ◽  
Vol 16 (2) ◽  
pp. 179-188 ◽  
Author(s):  
Luka Pavlovčič ◽  
Bernadette Froschmeier ◽  
Ulrike Kuhlmann ◽  
Darko Beg
Keyword(s):  
Material Properties ◽  
Local Buckling ◽  
Steel Plates ◽  
Test Results ◽  
Initial Imperfections ◽  
Euler Buckling ◽  
Thin Walled ◽  
Full Scale Tests ◽  
Box Columns ◽  
Good Agreement

This paper deals with tests on slender thin‐walled box columns, susceptible to instability of both types: to global Euler buckling as well as to local buckling of steel plates. Eight full‐scale tests were carried out with different global slenderness of welded and cold‐formed columns subjected to centric and eccentric compression. For the purpose of profound numerical simulations of tests, material properties were also tested, and the initial column geometry and residual stresses were carefully measured. The results of FEA simulations show good agreement with the test results. On verified numerical model the influence of different initial imperfections was studied. Santrauka Straipsnyje nagrinejami liaunuju dežinio skerspjūvio kolonu, jautriu abieju tipu nepastovumui ‐ bendrajam klupumui pa‐gal Euleri ir plieniniu plokšteliu vietiniam klupumui, eksperimentai. Buvo atlikti aštuoni centriškai ir ekscentriškai gniuždomu virintinio ir šaltai lankstyto skerspjūvio ivairaus liaunio kolonu natūriniai bandymai. Siekiant nuodugniai atlikti skaitini bandymu modeliavima, taip pat bandymu nustatytos mechanines plieno savybes ir kruopščiai išmatuoti visi pradiniai geometriniai nuokrypiai ir liekamieji itempiai. Skaitinio modeliavimo baigtiniu elementu metodu ir natūriniu bandymu rezultatai nedaug skiriasi. Tikrinamuoju skaitiniu modeliu buvo nagrinetas ivairiu pradiniu geometriniu netikslumu poveikis.

Experimental Research and Finite Element Analysis of Concrete-Filled Steel Box Columns with Longitudinal Stiffeners

2011 ◽  
Vol 287-290 ◽  
pp. 1037-1042 ◽  
Author(s):  
Jun Guang Zhang ◽  
Yong Jian Liu ◽  
Jian Yang ◽  
Kai Lei Xu
Keyword(s):  
Finite Element ◽  
Failure Modes ◽  
Local Buckling ◽  
Steel Tube ◽  
Steel Plates ◽  
Thin Wall ◽  
Test Results ◽  
Element Analysis ◽  
Longitudinal Stiffeners ◽  
Box Columns

For further study of mechanical properties of concrete-filled steel box columns (CFSBCs) with longitudinal stiffeners, axially loading tests of CFSBCs with longitudinal stiffeners was conducted to obtain their ultimate bearing capacity and failure modes. The test results were compared with those of hollow steel box columns with longitudinal stiffeners. Cross section of the test specimen was scaled from a chord member of Dongjiang Bridge. The experimental results show that failure mode of CFSBCs with longitudinal stiffeners is local buckling of steel plates, which is different from that of concrete-filled thin wall steel tube columns with longitudinal stiffeners. Although longitudinal stiffeners can prevent global buckling of steel plates, the effect is less obvious than that of concrete-filled thin wall steel tube columns. Meanwhile, three-dimensional finite element models (FEM) of the specimens were modeled using computer program ANSYS to obtain bearing capacities and load-strain curves. The FEM results coincide quite well with the test results. Further, influence of width to thickness ratio on mechanical behavior of CFSBCs was analyzed using FEM.

A New Method to Assess Ductility of CFT Box Columns with Binding Bars under Axial Compression

2012 ◽  
Vol 446-449 ◽  
pp. 78-81 ◽  
Author(s):  
Yue Ling Long ◽  
Jian Cai
Keyword(s):  
Experimental Data ◽  
Axial Compression ◽  
Material Properties ◽  
New Method ◽  
Box Columns ◽  
Good Agreement

A new method based on material properties instead of experimental data was proposed to assess the ductility of concrete-filled steel box columns with binding bars and those without binding bars. Comparison between ductility coefficients based on experimental data and the calculated values by the proposed method shows good agreement.

Local buckling of thin-walled steel box columns

1989 ◽  
Vol 8 (2) ◽  
pp. 119-145 ◽  
Author(s):  
J.Y. Richard Liew ◽  
N.E. Shanmugam ◽  
S.L. Lee
Keyword(s):  
Local Buckling ◽  
Thin Walled ◽  
Box Columns

Distortion of U-Channel Sections in Plastic Bending

1999 ◽  
Vol 121 (2) ◽  
pp. 208-213 ◽  
Author(s):  
K. A. Stelson ◽  
A. Kramer
Keyword(s):  
Material Properties ◽  
Energy Minimization ◽  
Plastic Bending ◽  
Circular Arc ◽  
Channel Section ◽  
Analytical Expression ◽  
Flat Base ◽  
Thin Walled ◽  
Good Agreement

When a thin-walled U-channel section is plastically bent, considerable in-plane distortion occurs. The initially flat base of the U is deformed into a circular arc. The sides remain perpendicular to the base so that an angle between the sides develops. In this paper, an analytical expression for the amount of distortion is derived based on energy minimization. The expression is purely geometrical indicating that distortion should not depend on material properties. The theory is compared with fourpoint bending experiments of thin-walled channels, with good agreement found.

Residual Stresses Due to Circumferential Welds

1973 ◽  
Vol 95 (4) ◽  
pp. 233-237 ◽  
Author(s):  
S. Vaidyanathan ◽  
A. F. Todaro ◽  
I. Finnie
Keyword(s):  
Residual Stresses ◽  
Material Properties ◽  
Residual Stress Distribution ◽  
Flat Plates ◽  
Circumferential Welds ◽  
Butt Weld ◽  
State Of Stress ◽  
Axisymmetric Shells ◽  
Thin Walled ◽  
Good Agreement

The residual stress distribution produced by a circumferential weld between axisymmetric shells (cylinders, spheres, cones, etc.) is quite different from that due to a butt weld between two flat plates. The reason for this difference is pointed out and it is shown that the state of stress in thin-walled shells may be estimated from that in a plate. Since a simple approximate method for predicting residual stresses in a butt-welded flat plate is available, it is possible to estimate the stresses due to a circumferential weld from the welding conditions and certain material properties. Experimental results show good agreement with the predictions.

Biaxial Ratcheting Under Strain or Stress-Controlled Axial Cycling With Constant Hoop Stress

1994 ◽  
Vol 61 (2) ◽  
pp. 422-428 ◽  
Author(s):  
Z. Xia ◽  
F. Ellyin
Keyword(s):  
Hoop Stress ◽  
304 Stainless Steel ◽  
Test Results ◽  
Cyclic Tests ◽  
Stress Memory ◽  
Qualitative And Quantitative ◽  
Thin Walled ◽  
Tubular Specimens ◽  
Hoop Direction ◽  
Good Agreement

Strain or stress-controlled tension-compression cyclic tests were conducted on pressurized thin-walled tubular specimens of 304 stainless steel. In strain-controlled mode ratcheting strains in hoop direction, and under stress-controlled mode ratcheting in both hoop and axial directions, were observed. To predict the observed ratcheting behavior, an additional evolution rule for the stress memory surface has been introduced in the constitutive model developed recently by the authors. Qualitative and quantitative comparisons with the test results indicate a fairly good agreement in predicting ratcheting deformations.

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