Effective length factor for columns in braced frames considering axial forces on restraining members

2006 ◽  
Vol 22 (6) ◽  
pp. 685-700 ◽  
Author(s):  
M.R. Mahini ◽  
H. Seyyedian
Keyword(s):  
Effective Length ◽  
Braced Frames ◽  
Effective Length Factor ◽  
Axial Forces

Effective length factor of columns in flexibly jointed and braced frames

1998 ◽  
Vol 47 (1-2) ◽  
pp. 93-118 ◽  
Author(s):  
N. Kishi ◽  
W.F. Chen ◽  
Y. Goto ◽  
M. Komuro
Keyword(s):  
Effective Length ◽  
Braced Frames ◽  
Effective Length Factor

Evaluation of effective length factors in braced frames

1983 ◽  
Vol 10 (1) ◽  
pp. 18-26 ◽  
Author(s):  
Donald J. Fraser
Keyword(s):  
Iterative Method ◽  
Effective Length ◽  
Braced Frames ◽  
Buckling Loads ◽  
Numerical Examples ◽  
Analysis And Design ◽  
Stability Functions ◽  
Axial Forces ◽  
Stabilizing Effect ◽  
Tension Members

A designer-oriented iterative method for the evaluation of effective length factors in braced frames is described. The formulae used in the method have been expressed in terms of effective length factors because designers use this parameter, rather than the values of critical buckling loads, in the analysis and design of columns. The method takes into account the reduced stiffness of restraining members due to the presence of significant axial forces and also allows for the stabilizing effect of tension members. Application of the method is demonstrated by numerical examples. Keywords: braced structures, buckling of continuous columns, frame buckling, truss buckling, effective length factors, accurate stability functions, linear approximations of stability functions, structural stability.

scholarly journals Inelastic Effective Length Factor of Nonsway Reinforced Concrete Columns

2009 ◽  
Vol 135 (9) ◽  
pp. 1034-1039 ◽  
Author(s):  
A. Bendito ◽  
M. L. Romero ◽  
J. L. Bonet ◽  
P. F. Miguel ◽  
M. A. Fernandez
Keyword(s):  
Reinforced Concrete ◽  
Concrete Columns ◽  
Effective Length ◽  
Reinforced Concrete Columns ◽  
Effective Length Factor

STABILITY AND SIMULATION-BASED DESIGN OF STEEL SCAFFOLDING WITHOUT USING THE EFFECTIVE LENGTH METHOD

2003 ◽  
Vol 03 (04) ◽  
pp. 443-460 ◽  
Author(s):  
S. L. CHAN ◽  
A. Y. T. CHU ◽  
F. G. ALBERMANI
Keyword(s):  
Bending Moment ◽  
Nonlinear Problems ◽  
Second Order ◽  
Effective Length ◽  
Analysis And Design ◽  
Order Analysis ◽  
Effective Length Factor ◽  
Highly Nonlinear ◽  
Reliable Design ◽  
Effective Length Method

A robust computer procedure for the reliable design of scaffolding systems is proposed. The design of scaffolding is not detailed in design codes and considered by many researchers and engineers as intractable. The proposed method is based on the classical stability function, which performs excellently in highly nonlinear problems. The method is employed to predict the ultimate design load capacities of four tested 3-storey steel scaffolding units, and for the design of a 30 m×20 m×1.3 m 3-dimensional scaffolding system. As the approach is based on the rigorous second-order analysis allowing for the P-δ and P-Δ effects and for notional disturbance forces, no assumption of effective length is required. It is superior to the conventional second-order analysis of plotting only the bending moment diagram with allowance for P-Δ effect since it considers both P-Δ and P-δ effects such that section capacity check is adequate for strength and stability checking. The proposed method can be applied to large deflection and stability analysis and design of practical scaffolding systems in place of the conventional and unreliable effective length method which carries the disadvantages of uncertain assumption of effective length factor (L e /L).

Nomograms for Determination of Effective Length of the Unregular Frames Based on Mechanics and Steel Structure

2014 ◽  
Vol 886 ◽  
pp. 402-407
Author(s):  
Da Tian Zhang ◽  
Dong Hua Zhou
Keyword(s):  
Steel Structure ◽  
Effective Length ◽  
Structure Stability ◽  
Displacement Method ◽  
Complex Situation ◽  
Stability Calculation ◽  
Effective Length Factor ◽  
Practical Engineering ◽  
Relevant Calculation

Determining the frame column effective length is a key part of the structure stability calculation in practical engineering. This specification for design of steel structure and specification for design of concrete are given in some relevant calculation formula and forms, but these formulas and tables can only be applied to the simple situation. In the complex situation, such as the frame column axial force and height is large, the formula is not applicable, may leads to unsafe results. In this paper. the formulas are deduced by using second-order displacement method in order to solve these problems,and the chart for determining the effective length is also obtained. The chart can be used to calculate the effective length factor quickly and concisely.

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