Eccentrically loaded columns and slender columns

2010 ◽  
pp.  -491
Keyword(s):  
Slender Columns

Discussion of “Creep Buckling of Slender Columns”

1966 ◽  
Vol 92 (1) ◽  
pp. 489-497
Author(s):  
Zdeněk P. Bažant
Keyword(s):  
Creep Buckling ◽  
Slender Columns

Nonlinear analysis of circular CFSST slender columns

2018 ◽  
pp. 61-93
Author(s):  
Vipulkumar Ishvarbhai Patel ◽  
Qing Quan Liang ◽  
Muhammad N. S. Hadi
Keyword(s):  
Nonlinear Analysis ◽  
Slender Columns

scholarly journals The Proposition of an EI Equation of Square and L–Shaped Slender Reinforced Concrete Columns under Combined Loading

2021 ◽  
Vol 11 (3) ◽  
pp. 7100-7106
Author(s):  
L. Hamzaoui ◽  
T. Bouzid
Keyword(s):  
Reinforced Concrete ◽  
Axial Load ◽  
Concrete Strength ◽  
Linear Regression Analysis ◽  
Strain Curve ◽  
Load Level ◽  
Combined Loading ◽  
Actual Behavior ◽  
Factors Affecting ◽  
Slender Columns

The stability and strength of slender Reinforced Concrete (RC) columns depend directly on the flexural stiffness EI, which is a major parameter in strain calculations including those with bending and axial load. Due to the non-linearity of the stress-strain curve of concrete, the effective bending stiffness EI always remains variable. Numerical simulations were performed for square and L-shaped reinforced concrete sections of slender columns subjected to an eccentric axial force to estimate the variation of El resulting from the actual behavior of the column, based on the moment-curvature relationship. Seventy thousand (70000) hypothetical slender columns, each with a different combination of variables, were used to investigate the main variables that affect the EI of RC slender columns. Using linear regression analysis, a new simple and linear expression of EI was developed. Slenderness, axial load level, and concrete strength have been identified as the most important factors affecting effective stiffness. Finally, the comparison between the results of the new equation and the methods proposed by ACI-318 and Euro Code-2 was carried out in connection with the experimental results of the literature. A good agreement of the results was found.

scholarly journals Stiffness of Concrete-Filled Thin-Walled Steel Tubular Slender Columns

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Alireza Bahrami ◽  
Ali Mahmoudi Kouhi
Keyword(s):  
Uniform Distribution ◽  
Experimental Tests ◽  
Simulation Method ◽  
Steel Tube ◽  
Initial Stiffness ◽  
Cross Sectional ◽  
Circular Column ◽  
Finite Element Software ◽  
Thin Walled ◽  
Slender Columns

Abstract Concrete-filled thin-walled steel tubular slender columns are studied in this paper to evaluate their stiffness. The slender columns have various steel tube thicknesses, length/diameter (width) ratios, and concrete compressive strengths. The columns are loaded by axial and eccentric loads. Two experimental tests of the slender and stub columns are described. Also, the finite element software ABAQUS is utilised to simulate and analyse the columns. The tested columns are simulated taking into account all their features in the tests to verify the simulation of the columns. The simulation results are compared with the tests results which reveal that good agreements exist between them. Thus, the proposed simulation method of the columns is verified. In order to assess the stiffness of the columns under different conditions, various load eccentricities (0 mm, 25 mm, and 50 mm), cross-sectional configurations (circular, rectangular, and square), and steel tube thicknesses (2 mm, 3.35 mm, and 5 mm) are adopted for the developed columns. The columns are simulated and analysed based on the verified simulation method considering the mentioned conditions. As a conclusion, the stiffness of the columns is generally reduced by the increase of the load eccentricity from 0 mm to 25 mm and 50 mm. Further, more uniform distribution of the stiffness is witnessed for the columns with lower eccentricities. In addition, the enhancement of the load eccentricity increased the reduction slope of the stiffness graph for the columns. Although the initial stiffness of the circular column is slightly lower than the rectangular and square columns, the stiffness has more uniform distribution which is preferred. Larger stiffness is achieved for the columns by increasing the steel tube thickness from 2 mm to 3.35 mm and 5 mm.

Experimental research on high strength concrete slender columns subjected to compression and biaxial bending forces

2008 ◽  
Vol 30 (7) ◽  
pp. 1879-1894 ◽  
Author(s):  
L. Pallarés ◽  
J.L. Bonet ◽  
P.F. Miguel ◽  
M.A. Fernández Prada
Keyword(s):  
Experimental Research ◽  
High Strength Concrete ◽  
High Strength ◽  
Biaxial Bending ◽  
Strength Concrete ◽  
Slender Columns

Response of Slender Columns to Rapid Compression

1969 ◽  
Vol 95 (1) ◽  
pp. 211-222
Author(s):  
Martin L. Moody
Keyword(s):  
Rapid Compression ◽  
Slender Columns

Eccentric loading of a 25-m long composite column subjected to a combination of axial compression and transverse gravity loading using a horizontal test method

2019 ◽  
Vol 27 (5) ◽  
pp. 237-252
Author(s):  
RH Gaarder ◽  
J Smith ◽  
Øyvind Welgaard ◽  
Ivar Brovold ◽  
André Duus
Keyword(s):  
High Voltage ◽  
Adhesive Bonding ◽  
Scientific Work ◽  
Test Method ◽  
Structural Elements ◽  
Transmission Tower ◽  
Composite Columns ◽  
Transverse Loads ◽  
Slender Columns

This article presents a feasibility study where fibre-reinforced structural elements are assembled into long slender columns using adhesive bonding. The columns are intended to be part of an externally guyed high-voltage transmission tower where they are subjected to a combination of compressive and transverse loads. The article has shown that 25-m long poles can be made with small tolerances in both angularity and concentricity. Previous published scientific work on buckling of composite columns was applied to predict the behaviour of the pole as it was being loaded in compression to 1200 kN or within 5% of its critical load in a bespoke horizontal test jig. The confidence in the material, the structural elements, the analysis method and the quality of the test equipment has shown that there is a potential in further optimization of the structure that will ultimately be a part of a high-voltage composite tower.

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