Ultimate Bearing Capacity of Unconfined Bolted Connections in Cold-Formed Steel Members

Analysis of axially compressed steel members made of cold formed profiles presented in this paper was conducted through both experimental and numerical methods. Numerical analysis was conducted by means of "PAK" finite element software designed for nonlinear static and dynamic analysis of structures. Results of numerical analysis included ultimate bearing capacity with corresponding middle section force-deflection graphs and buckling curves. Extensive experimental investigation were also concentrated on determination of bearing capacity and buckling curves. Experiments were conducted on five series with six specimens each for slenderness values of 50, 70, 90, 110 and 120. Compressed simply supported members were analyzed on Amsler Spherical pin support with unique electronical equipment and software. Besides determination of forcedeflection curves, strains were measured in 18 or 12 cross sections along the height of the members. Analysis included comparisons with results obtained by different authors in this field recently published in international journals. Special attention was dedicated to experiments conducted on high strength and stainless steel members.

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Overall Stability of Cold-Formed Steel Lipped Channel Axially Compressed Members with Batten Plates

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.94-96.953 ◽

2011 ◽

Vol 94-96 ◽

pp. 953-957

Author(s):

De Fa Sun

Keyword(s):

Bearing Capacity ◽

Steel Structure ◽

Calculation Methods ◽

Steel Members ◽

Overall Stability ◽

Cold Formed Steel ◽

Thin Walled ◽

Flexural Torsional Buckling ◽

Warpage Deformation ◽

Specific Number

Batten plates can play a significant role in reducing the bearing capacity of the entire component and preventing the upward warpage deformation in the opening section. The specific number of batten plates should be calculated for the open cold-formed thin-walled steel structure. By theoretical analysis, this study develops the flexural-torsional buckling formula for the open lipped-channel section cold-formed thin-walled axially compressed members with batten plates. The calculating results show that, according to the configuration rule with 80 iy space between batten plates along the opening direction in the open thin-walled steel members, the warpage deformation will be effectively prevented in the opening direction. Besides, the bearing capacity of the entire member will be increased. The proposed calculation methods can actively complement the existing code.

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Tilt bearing capacity of single-shear single-row bolted connections in cold-formed steel

Insights and Innovations in Structural Engineering, Mechanics and Computation ◽

10.1201/9781315641645-203 ◽

2016 ◽

pp. 1241-1245

Author(s):

M Uz ◽

L Teh

Keyword(s):

Bearing Capacity ◽

Bolted Connections ◽

Single Row ◽

Cold Formed Steel ◽

Single Shear

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Study on Buckling of Two Kinds of Thin-Walled Steel Members with Imperfection

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.744-746.309 ◽

2015 ◽

Vol 744-746 ◽

pp. 309-314

Author(s):

Peng Niu ◽

Hai Tao Wang ◽

Chun Fu Jin ◽

Ying Guo

Keyword(s):

Finite Element Method ◽

Finite Element ◽

Bearing Capacity ◽

Compressive Load ◽

Bending Moment ◽

Steel Tube ◽

Ultimate Bearing Capacity ◽

Axial Compressive Load ◽

Steel Members ◽

Square Steel Tube

Based on Ježek method of computing the elastic-plastic buckling of the members under the axial compressive load and the bending moment, considering the initial imperfection, the analytical expressions of calculating the ultimate load of buckling about the neutral axis with the maximum moment of inertia for an H-shaped member and a square steel tube member are derived. Using the elastic-plastic finite element method and the theory of nonlinear buckling, the impact by initial geometric imperfections on the H-shaped steel member and the square steel tube member under the axial compressive load and the bending moment are analyzed and the numerical solutions of ultimate bearing capacity are obtained. By compared with the values of the finite element method (FEM), it shows that the analytical method in this paper is valid. The results of the example show that the presence of initial imperfections reduces the ultimate bearing capacity of the two kinds of steel members to a great extent. It is also found that the influence of the initial geometric imperfection on the ultimate bearing capacity of members is smaller when the bending moment increases.

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