Influence of joint rigidity on the elastic buckling load of sway and non-sway steel frames

Abstract

Much work has been conducted in the past on the influence of the rigidity of structural joints on the behavior of steel frames. Buckling of a column is fundamental to the design of load bearing structures mainly when the analysis of such frames takes into account the effect of the connection flexibility. The present work deals with such an effect on the elastic buckling load of plane steel frames. The proposed model consists in the development of comprehensive approach taking into account, the effects of the joint rigidity, the elastic buckling load for both sway and non-sway frames. Only one element is required over the length of the element to model stability, which let to solve practical problem with little computational effort. Some practical formulas for determining critical load for plane steel frames are then presented. The elastic buckling load is found to be strongly affected by semi-rigid joints and reveals that the proposed model is computationally very efficient with the expressions presented being general.

Investigation of the viscous fluid effect on torque and drag modeling in highly deviated wells

“…Technically, drag can be regarded as the force that inhibits the motion of an object in a straight line. In the wellbore, it is more conveniently explained as the force required in lowering or pulling the string in and out of the well (Ihaddoudènea et al, 2018). When tripping in (lowering the string into the hole), the string moves downward into the well while the drag acts upwards against the direction of the string movement.…”