الموقع الإلكتروني أ . د . المهندس السيد عبدالفتاح القصبي أستاذ متفرغ ميكانيكا التربة والأساسات
” Elastic Stability of Portal Frames Restrained by Roof Sheeting Under Static Loads “Engineering Research Bulletin, University of Helwan, Mataria, Cairo, Egypt, Vol 48, May, 1996.
El-Kasaby E.A Aly Gmal Aly Aly Ahmed Makhlouf
ABSTRACT:
This paper proposes a simplified method for the calculation of the critical load of a portal frame with fixed supports and restrained by roof sheeting. The roof sheeting is idealized as concentrated spring in the direction of the girder. The method of analysis is built on the equilibrium of moment at the connection between the column and girder. A closed from expression for the calculation of the critical load is derived. Application of this expression on some practical with increasing the elastic stiffness of the roof sheeting.
