Experimental evaluation of the compressive resistance of non-stress-relieved solid round steel columns

2008 ◽  
Vol 35 (11) ◽  
pp. 1221-1238
Author(s):  
K. Sennah ◽  
M. Saliba ◽  
M. Al-Hashimy ◽  
J. Wahba
Keyword(s):  
Research Council ◽  
Current Practice ◽  
Experimental Investigations ◽  
Test Program ◽  
Steel Columns ◽  
Economical Design ◽  
Communication Towers ◽  
Compressive Resistance ◽  
Supporting Structures ◽  
Resistance Equation

Solid round steel columns are commonly used as legs and also as diagonal and horizontal members of communication towers. The Canadian standard Antennas, towers, and antenna supporting structures, CSA S37–01, specifies empirical expressions for the compressive resistance of solid round columns based on the Structural Stability Research Council (SSRC) column curves for non solid round columns as well as the results from experimental investigations on solid rounds that have been carried out since 1965. As such, it was felt necessary to conduct an experimental study on non-stress-relieved steel solid round columns to refine the available design equations for such columns. This paper provides a summary of a recent test program on the compressive resistance of non-stress-relieved steel solid rounds. Correlation between the results from these tests and the current practice for the design of solid rounds is investigated. The paper concludes with a proposed compressive resistance equation for economical design of such columns.

scholarly journals Experimental Investigations of Concrete Filled Battened Steel Columns of Different Slenderness

2019 ◽  
Vol 65 (4) ◽  
pp. 3-19
Author(s):  
M. Siennicki
Keyword(s):  
Carrying Capacity ◽  
Concrete Columns ◽  
Experimental Investigations ◽  
Load Carrying Capacity ◽  
Design Standards ◽  
Steel Columns ◽  
Load Carrying ◽  
Bare Steel ◽  
Concrete Filling ◽  
Full Scale Tests

AbstractThe study investigates the axial load behaviour of concrete filled battened steel columns not covered by the design standards. A series of full scale tests on two I-sections connected together with intermediate batten plates and filled with concrete were carried out. The main parameters varied in the tests are length of the members and strength of the concrete filling. One bare steel member was also tested and results were compared with those filled with concrete. The tests results were illustrated by load-strain curves. The main objectives of these tests were twofold: first, to describe behaviour of new steel-concrete columns and second, to analyze the influence of slenderness on load-carrying capacity.

Experimental basis for the effective length factors of steel solid round cross-braced diagonals in CSA Standard S37-01

2002 ◽  
Vol 29 (3) ◽  
pp. 430-435
Author(s):  
Yongcong Ding ◽  
Kalid S Jaboo ◽  
Yean Sun ◽  
Murty K.S Madugula
Keyword(s):  
Effective Length ◽  
Test Results ◽  
Experimental Basis ◽  
Failure Loads ◽  
Lattice Tower ◽  
Communication Towers ◽  
Round Cross ◽  
Compressive Resistance

The effective length factors for steel solid round diagonals in all-welded communication towers are investigated in this paper to provide experimental basis for the relevant clauses in CSA Standard S37-01. The results of a total of 31 all-welded lattice tower specimens with three types of cross-braced diagonals are presented. The failure loads for these members were determined from the maximum axial strains measured during the tests. The effective length factors were then back-calculated from the experimental failure loads using the compressive resistance formulas. The test results showed that even the significantly lower effective length factors specified in CSA S37-01, compared to CSA S37-94, are still conservative.Key words: all-welded towers, communication towers, cross-bracing, effective length factors, solid round steel diagonals.

Compressive Resistance of Steel Columns in Fire: Rankine Approach

2000 ◽  
Vol 126 (3) ◽  
pp. 398-405 ◽  
Author(s):  
W. S. Toh ◽  
K. H. Tan ◽  
T. C. Fung
Keyword(s):  
Steel Columns ◽  
In Fire ◽  
Compressive Resistance

scholarly journals An Experimental Investigation on Concrete Filled Steel Tube Columns Under Axial Compression

2021 ◽  
Keyword(s):  
Experimental Investigation ◽  
Axial Compression ◽  
American Concrete Institute ◽  
Steel Tube ◽  
Test Program ◽  
Conventional Concrete ◽  
Concrete Filled Steel Tube ◽  
Steel Columns ◽  
Circular Column ◽  
Tubular Sections

Abstract. This paper presents an experimental investigation on the behaviour of concrete filled steel tube columns under axial compression. The steel columns were filled with self-compacting and self-curing concrete instead of normal conventional concrete. A test program consisting of square column, circular column and rectangular column was firstly conducted. The behaviour of three concrete filled steel tubular sections (CFSTs) under axial load is presented. The effect of steel tube dimensions, shapes and confinement of concrete are also examined. Measured column strengths are compared with the values predicted by Euro code 4 and American codes. Euro code 4, gives good estimation of self-compaction concrete. However, lower values as measured during the experiments were predicted by the American Concrete Institute (ACI) equation. Also, the effect of thickness of steel tubes, concrete cube strength and steel percentage is also studied. In addition to CFST column the steel tube also acts as confinement for concrete.

A simple equation for axially loaded steel column design curves

1996 ◽  
Vol 23 (1) ◽  
pp. 272-276 ◽  
Author(s):  
Robert Loov
Keyword(s):  
Research Council ◽  
Steel Structures ◽  
Axial Loads ◽  
Limit States ◽  
Steel Columns ◽  
Inelastic Analysis ◽  
Steel Column ◽  
Column Design ◽  
Axially Loaded ◽  
Continuous Equation

Clause 13.3 of the Canadian Standards Association Standard CAN/CSA-S16.1-M89 "Limit states design of steel structures" utilizes complex five-piece curves to specify the limiting capacity of axially loaded steel columns. A study of these equations shows that they do not fit smoothly together. The resulting curves are scalloped. It has been found that the five-piece curves can be replaced by one continuous equation which never deviates by more than approximately 3% from the S16.1-M89 values. The proposed equation is applicable to all three column curves of the Structural Stability Research Council with only a change in the value of the exponent. The proposed equation has been adopted in the recently published CAN/CSA-S16.1-94 standard. Key words: axial loads, columns, inelastic analysis, steel columns.

NUMERICAL ANALYSIS OF COMBINED-SECTION STEEL COLUMNS

2018 ◽  
Vol 5 (1) ◽  
Author(s):  
George Iskander ◽  
Ezzeldin Sayed-Ahmed ◽  
Emam Soliman
Keyword(s):  
Numerical Model ◽  
The Other ◽  
Experimental Investigations ◽  
Bending Moments ◽  
The Finite Element Method ◽  
Steel Columns ◽  
Initial Imperfections ◽  
Codes Of Practice ◽  
Axial Forces ◽  
Steel Sections

Combined-section columns composed of two separate steel sections present an ideal and economic design for long columns subject to high values of bending moments and axial forces. Research dealing with design of these columns is currently insufficient. At present, most codes of practice consider each column's component to behave either separately or rigidly connected to the other components. As such, the main objective of this research is to scrutinize the behavior of laced-section columns, which are subjected to eccentric loading and propose design criteria for them. In this paper, a non-linear numerical model for these columns is developed based on the finite element method. The results of the numerical model are first verified against the outcomes of experimental investigations available in literature. Then, the model is adopted to simulate the behavior and the capacity of the combined laced columns. The numerical model includes both the geometric and materials nonlinearities along with the effect of initial imperfections.

Results of Coordinating Research Council MMT Field Test Program

1979 ◽  
Author(s):  
J. D. Benson ◽  
R. J. Campion ◽  
L. J. Painter
Keyword(s):  
Field Test ◽  
Research Council ◽  
Test Program

scholarly journals Influence of the cable´s layout on the shearing resistance of prestressed concrete beams

2016 ◽  
Vol 9 (5) ◽  
pp. 765-795
Author(s):  
O. A. SOUZA JUNIOR ◽  
D. R. C. OLIVEIRA
Keyword(s):  
Cross Section ◽  
Prestressed Concrete ◽  
Concrete Beams ◽  
Shear Resistance ◽  
Experimental Investigations ◽  
Technical Literature ◽  
Shearing Resistance ◽  
Eurocode 2 ◽  
Compressive Resistance ◽  
Prestressed Beams

Abstract Little information on experimental investigations regarding the influence of the prestressing forces in the shear resistance of prestressed beams is found in the technical literature. Thus, it was experimentally evaluated the shear resistance of six post-tensioned prestressed concrete beams with cross section of (150 x 450) mm2, total length of 2400 mm and concrete's compressive resistance of 30 MPa, with the variables of this work being the layout of the prestressing cable, straight or parabolic, and the stirrups geometric rate. Verticals displacement, steel and concrete's strains and a comparison of the experimental loads with the estimates of ACI 318, EUROCODE 2 and NBR 6118: 2014 codes are presented and discussed. The results showed that the cable's parabolic layout increased the beams' shear resistance in up to 16% when compared to beams with straight cables.

scholarly journals Effect of residual stresses and cold-straightening on the compressive resistance of solid round steel columns

2021 ◽  
Author(s):  
Jin Xu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Residual Stresses ◽  
Diffraction Method ◽  
X Ray Diffraction ◽  
Element Analysis ◽  
Steel Columns ◽  
Thermal Residual Stresses ◽  
Different Diameters ◽  
Compressive Resistance

The objective of this research is to study the effects of residual stresses and cold-straightening on the compressive resistance of solid round steel columns. Thermal residual stresses in selected solid round sizes were determined from experimental study, finite element analysis, and previous research. In the experimental investigation, classical boring-out method using water-jet technology was applied on four samples with different diameters. Finite element models were constructed for the determination of thermal reidual stresses for columns with 12 different diameters. The results were then compared with results obtained from a recent study on the predictionof symmetrical residual stresses in solid rounds using X-ray diffraction method. For the non-symmetrical residual stresses arising from cold-straightening, the equation developed by Nitta and Thurlimann was adopted in the finite element modeling to study the effect of non-symmetrical residual stresses on the compressive resistance of solid round steel columns. The Finite Element Analysis has been conducted on different bar diameter (1.5 inch to 12 inch diameter) and length, as well as initial out-of-straightness.

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