Torsional – flexural buckling strength of steel angles

1996 ◽  
Vol 23 (1) ◽  
pp. 260-271 ◽  
Author(s):  
Seshu M. R. Adluri ◽  
Murty K. S. Madugula
Keyword(s):  
Local Buckling ◽  
Rolled Steel ◽  
Design Strength ◽  
Flexural Buckling ◽  
Plate Buckling ◽  
Steel Members ◽  
Steel Angles ◽  
Hot Rolled ◽  
Hot Rolled Steel ◽  
Steel Design

Although structural steel angles have a wide variety of applications, they have not received attention comparable to that given to heavy shapes such as wide-flange sections. Because steel angles are singly symmetric or asymmetric, torsional-flexural buckling is an important mode of failure. The Canadian steel design practice for hot-rolled steel members (as given by CAN/CSA-S16.1-94) does not give a detailed procedure applicable to all sizes of steel angles. Some of the world codes applicable for steel angles specify torsional–flexural buckling check and plate buckling check to be considered simultaneously wherever applicable. The paper presents the results of an experimental investigation consisting of 34 hot-rolled steel angles under concentric compression (slenderness ratios between 50 and 150) failing in torsional?flexural buckling. The width to thickness ratios of test specimens ranged from 13 to 20. The results give a continuous spread of compressive strengths for practical ranges of slenderness parameters. The results show that torsional–flexural buckling and plate buckling need not be considered simultaneously even for unequal angles if they are designed according to CAN/CSA-S16.1-94. Key words: angle, buckling, codes and standards, compression, design strength, flexural buckling, local buckling, specifications, steel, torsional–flexural buckling.

Design of 60° equal-leg steel angles according to CSA Standard S37-94

1995 ◽  
Vol 22 (3) ◽  
pp. 603-610
Author(s):  
Murty K. S. Madugula ◽  
Seshu Madhava Rao Adluri
Keyword(s):  
Experimental Studies ◽  
Local Buckling ◽  
Design Procedure ◽  
Technical Committee ◽  
Design Strength ◽  
Widespread Application ◽  
Flexural Buckling ◽  
Steel Angles ◽  
Lattice Towers ◽  
First Time

Sixty-degree equal-leg steel angles find widespread application as leg members of triangular-base lattice towers. Compared to 90° angles of the same size, these angles are weaker in torsional-flexural buckling. The design of such angles is being explicitly covered for the first time in CSA Standard S37-94, "Antennas, towers and antenna-supporting structures." Recent experimental studies have shown that the design of 60° angles will be quite safe, if design is carried out using the expressions for factored axial compressive resistances given in CAN/CSA-S16.1-M89, taking into account only the effect of local buckling and flexural buckling about minor axis, and neglecting torsional-flexural buckling. The Canadian Standards Association Technical Committee on Antenna Towers also noted that the calculated resistances will still be less than the strengths according to the widely used Standard ANSI/ASCE 10-90, "Design of latticed steel transmission structures," which considers all the three modes of buckling. The present paper explains the rationale behind the design procedure adopted by the Technical Committee. Key words: angles, buckling, compression, design strength, schifflerized angles, specifications, steel towers, 60° angles.

scholarly journals On the Origin of I Beams and Quick Analysis on the Structural Efficiency of Hot-rolled Steel Members

2017 ◽  
Vol 11 (1) ◽  
pp. 332-344 ◽  
Author(s):  
Gianmaria Di Lorenzo ◽  
Antonio Formisano ◽  
Raffaele Landolfo
Keyword(s):  
Local Buckling ◽  
Rolling Process ◽  
Raw Material ◽  
Performance Category ◽  
Structural Efficiency ◽  
Steel Members ◽  
Points Of View ◽  
The Difference ◽  
Hot Rolled ◽  
Hot Rolled Steel

Background:In the current paper the origin of steelIbeams has been analysed from historical-technological and structural points of view.Method:First, the way leading to discover the most famous structural member of the modern Steel Engineering has been reconstructed. Later on, parameters of structural efficiency, allowing for a quick numerical evaluation of the effects produced by the rolling process on the semi-finished casting products, have been defined as a function of the difference in terms of weight between the solid billet and the member final shape on the basis of the more or less raw material centrifugation. By using the above mentioned structural efficiency parameters, the design criteria used for development of the European list of sections, with particular reference to IPE and HE profiles, have been comprehended.Result and Conclusion:Finally, the proposed method, if applied to members having the same area, allows defining, without considering local buckling phenomena, the best profile for each performance category of steel members.

FLEXURAL AND LOCAL BUCKLING INTERACTION OF STEEL ANGLES

2005 ◽  
Vol 05 (02) ◽  
pp. 143-162 ◽  
Author(s):  
S. J. MOHAN ◽  
N. PRASAD RAO ◽  
N. LAKSHMANAN
Keyword(s):  
Local Buckling ◽  
Research Station ◽  
Column Buckling ◽  
Inelastic Buckling ◽  
The Past ◽  
Plate Buckling ◽  
Transmission Towers ◽  
Experimental Works ◽  
Steel Angles ◽  
Hot Rolled

The column buckling equation and plate buckling equation are merged to obtain a graphical relation in the elastic and inelastic buckling ranges. This graphical relation has been used to classify all possible modes of hot rolled angle sections investigated by previous researchers in their experimental works. Forced plate buckling experiments have been carried out to verify the graphical relation for plate buckling. Design practices adopted by various standards for design of steel angles, have been compared with respect to this graphical relation and discussed. The importance of width to thickness ratio has been used to emphasize the buckling characteristics of hot rolled angle sections. The objective of this paper is to discuss the plate buckling failures of the angle sections recorded during full scale testing of transmission towers at Tower Testing and Research Station, SERC, Chennai, India. The plate buckling failures in tower testing for the past eighteen years have been analyzed and suggestions are given to avoid such failures in real structures and during testing.

DOGAL H 700 LAD

Alloy Digest ◽  
2015 ◽  
Vol 64 (3) ◽  
Keyword(s):  
Yield Strength ◽  
Physical Properties ◽  
Tensile Properties ◽  
Rolled Steel ◽  
Bend Strength ◽  
Hot Rolled ◽  
Hot Rolled Steel ◽  
Minimum Yield

Abstract Dogal H 700 LAD is a galvanized hot rolled steel that is microalloyed and can be cold formed. The 700 signifies the minimum yield strength. This datasheet provides information on composition, physical properties, tensile properties. and bend strength. It also includes information on forming. Filing Code: CS-184. Producer or source: SSAB Swedish Steel Inc..

ARMCO FORMABLE 70 HR

Alloy Digest ◽  
1979 ◽  
Vol 28 (5) ◽  
Keyword(s):  
Nonmetallic Inclusions ◽  
High Strength ◽  
Heat Treating ◽  
Rolled Steel ◽  
Low Carbon ◽  
Controlled Processing ◽  
High Strength Level ◽  
Hot Rolled ◽  
Hot Rolled Steel ◽  
Special Composition

Abstract ARMCO FORMABLE 70 HR is a hot-rolled steel with excellent ductility, weldability and edge-tear resistance at a minimum yield strength of 70,000 psi (483 MPa). For this relatively high strength level, it has unusually good fabricating properties that are the result of closely controlled processing of a fully killed, low-carbon, vacuum-degassed, columbium-alloyed steel. This special composition and processing practice minimize harmful nonmetallic inclusions that hamper formability. Typical applications include automotive reinforcements, truck parts and construction components. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fatigue. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SA-359. Producer or source: Armco Inc., Eastern Steel Division.

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