Buy article PDF
The purchased file will be sent to you
via email after the payment is completed.
US$ 35
|
Structural Engineering and Mechanics Volume 6, Number 4, June 1998 , pages 411-425 DOI: https://doi.org/10.12989/sem.1998.6.4.411 |
|
|
|
New stability equation for columns in unbraced frames |
||
Essa HS
|
||
| Abstract | ||
| The effective length factor of a framed column may be determined by means of the alignment chart procedure. This method is based on many unrealistic assumptions, among which is that all columns have the same stiffness parameter, which is dependent on the length, axial load, and moment of inertia of the column. A new approximate method is developed for the determination of effective length factors for columns in unbraced frames. This method takes into account the effects of inelastic column behaviour, far end conditions of the restraining beams and columns, semi-rigid beam-to-column connections, and differentiated stiffness parameters of columns. This method may be implemented on a microcomputer. A numerical study was carried out to demonstrate the extent to which the involved parameters affect the K factor. The beam-to-column connection stiffness, the stiffness parameter of columns, and the far end conditions of restraining members have a significant effect on the K factor of the column under investigation. The developed method is recommended for design purposes. | ||
| Key Words | ||
| unbraced frames, stability, design, columns, effective length factor, inelastic behaviour, concrete frames, steel frames, buckling | ||
| Address | ||
| Essa HS, Ain Shams Univ, Dept Civil Engn, Cairo, Egypt Ain Shams Univ, Dept Civil Engn, Cairo, Egypt | ||