Characterization equations for steel column base connections

2006 ◽  
Vol 33 (4) ◽  
pp. 409-420 ◽  
Author(s):  
Martin Dumas ◽  
Denis Beaulieu ◽  
André Picard
Keyword(s):  
Steel Structure ◽  
Experimental Results ◽  
Finite Element Models ◽  
Analysis Software ◽  
Analytical Characterization ◽  
Steel Connections ◽  
Steel Column ◽  
Base Connections ◽  
Column Bases ◽  
Column Base

This paper presents partial results of a research program under way at Laval University for which the main goal is to introduce the behaviour of steel connections into commercial structural analysis software. The objective of this paper is to derive analytical characterization equations for three commonly used steel column base connections. The procedure to derive these equations is based on a curve standardization theory that requires a number of experimental results in the form of moment–rotation curves that characterize the behaviour of column base connections. Because of a lack of available experimental results, data were obtained from finite element models. The design of a simple steel structure introducing the semi-rigid behaviour of column bases is presented as an example. It shows that consideration of the semi-rigidity of column base connections increases the accuracy of the analysis results and leads to a decrease in structure weight and deformation.Key words: analysis, base, behaviour, column, connection, frame, partial, rigidity, steel, structure.

Using composite yield mechanism to mitigate seismic damage to exposed steel column base connections

2021 ◽  
Vol 232 ◽  
pp. 111877
Author(s):  
Yao Cui ◽  
Fengzhi Wang ◽  
Cancan Yang ◽  
Hao Li ◽  
Yangzi He
Keyword(s):  
Seismic Damage ◽  
Steel Column ◽  
Base Connections ◽  
Column Base

Force Transfer Mechanism in Embedded Steel Column Bases

2006 ◽  
Vol 326-328 ◽  
pp. 1805-1810 ◽  
Author(s):  
Young Ho Kim ◽  
Seung Sik Lee ◽  
Jae Ho Jung ◽  
Soon Jong Yoon
Keyword(s):  
Shear Strength ◽  
Bond Strength ◽  
Carrying Capacity ◽  
Experimental Results ◽  
Load Carrying Capacity ◽  
Force Transfer ◽  
Load Carrying ◽  
Steel Column ◽  
Force Transfer Mechanism ◽  
Column Base

This paper presents the results of an investigation on the force transfer mechanism in an embedded column base of a composite structure. In the experimental program, eighteen push-out specimens were tested. The factors influencing the mechanism of force transfer were the amount of confining reinforcement, compressive strength of concrete, and diameter of stud connectors. The results of experiment indicated that force transfer could be characterized into two stages, and the factors governing each stage were identified. The first stage was governed by the bond strength between the steel column base and the concrete. The second stage begun after chemical debonding and was governed by the shear strength of stud connectors as well as the frictional strength between the steel and the concrete. Based on the experimental results, the equations to estimate the bond strength, the friction strength, and the shear strength of stud connectors were proposed. The load carrying capacity of an embedded steel column base could be predicted by taking the sum of the shear strength of stud connectors and the friction strength. The predicted load carrying capacity was found to agree well with the experimental results over various range of concrete stress.

scholarly journals 11.11: Rocking damage-free steel column base with friction devices: Development of advanced 3D finite element models in Abaqus

ce/papers ◽  
2017 ◽  
Vol 1 (2-3) ◽  
pp. 2916-2925
Author(s):  
Christoforos A. Dimopoulos ◽  
Fabio Freddi ◽  
Theodore Karavasilis
Keyword(s):  
Finite Element ◽  
Finite Element Models ◽  
3D Finite Element ◽  
Steel Column ◽  
Column Base

Analysis and design of demountable embedded steel column base connections

2017 ◽  
Vol 23 (3) ◽  
pp. 303-315 ◽  
Author(s):  
Dongxu Li ◽  
Brian Uy ◽  
Vipul Patel ◽  
Farhad Aslani
Keyword(s):  
Analysis And Design ◽  
Steel Column ◽  
Base Connections ◽  
Column Base

Rotational restraint of a simple column base connection

1987 ◽  
Vol 14 (1) ◽  
pp. 49-57 ◽  
Author(s):  
A. Picard ◽  
D. Beaulieu ◽  
B. Pérusse
Keyword(s):  
Base Plate ◽  
Relative Displacement ◽  
Effective Length ◽  
Test Results ◽  
Effective Length Factor ◽  
Steel Base ◽  
Steel Column ◽  
Simple Column ◽  
Base Connections ◽  
Column Base

This paper presents the results of an experimental investigation on the behaviour of steel column base connections. The purpose of the study was to determine the value of the rigidity ratio at the column base (GL). The connection is made of a steel base plate welded to the lower end of the column and attached to the footing by means of two or four anchor bolts. It is generally admitted that this type of connection behaves like a hinge and it is recommended to use GL = 10.0 to evaluate the effective length factor of the column.The test results indicate that for weak-axis buckling a conservative value of the rigidity ratio is GLY = 0.50 and for strong-axis buckling GLX = 1.50, if there is no relative displacement of column ends. The effective length of the column is therefore reduced. A design example shows that the column strength is increased by approximately 30% for slenderness ratios currently met in practice. Key words: steel column, column base connection, moment–rotation curve, buckling.

scholarly journals Study of design methodologies of steel column bases

2018 ◽  
Vol 11 (1) ◽  
pp. 203-243
Author(s):  
I. PIANA ◽  
A. F. G. CALENZANI
Keyword(s):  
Pressure Distribution ◽  
Design Procedure ◽  
Steel Structure ◽  
Base Plate ◽  
Concrete Surface ◽  
Design Methodologies ◽  
Significant Difference ◽  
Steel Column ◽  
Column Bases ◽  
Brazilian Standard

Abstract The behavior of a steel structure is directly related to the type of base used in the columns, which is essential to the stability and security of the structural system. The Brazilian standard ABNT NBR 8800:2008 does not directly covers this subject. Another Brazilian standard, ABNT NBR 16239:2013, presents a limited design procedure to hollow columns. In this paper, two design methodologies are presented considering the uniform and triangular pressure distribution between the base plate and the concrete surface. A computational program has been developed to design steel column bases considering both methodologies mentioned. The program has been validated with manually solved design examples and conclusions about the pressure distribution design procedures were made from the 200 bases designed by the program. It was noted that, for the triangular pressure distribution, there is an interval in which the procedure is not completely applicable. Apart from this interval, there was no significant difference in the results.

Behaviour of a simple column base connection

1985 ◽  
Vol 12 (1) ◽  
pp. 126-136 ◽  
Author(s):  
A. Picard ◽  
D. Beaulieu
Keyword(s):  
Base Plate ◽  
Moment Capacity ◽  
Steel Base ◽  
Steel Column ◽  
Ultimate Moment ◽  
Fixity Factor ◽  
Simple Column ◽  
Concrete Footing ◽  
Base Connections ◽  
Column Base

This paper presents the results of an experimental investigation on the behaviour of steel column base connections. The connection is effected by means of a steel base plate welded to the lower end of the column and attached to the concrete footing with two or four anchor bolts. The testing program comprised 15 specimens. The measured moment–rotation curves were used to determine the fixity factors of the base connections, taking into account the presence of an axial compression load.The results indicate that the compression force in the column significantly increases the flexural stiffness of the base connection and that the rotational restraint offered by the column base is sufficient to be considered in design. The results also show that the method of analysis used to determine the ultimate moment capacity of the base connection is conservative. Key words: steel column, column base connection, moment–rotation curve, anchor bolt, flexibility factor, fixity factor.

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