Elastic compressive-flexural-torsional buckling in structural members

[摘要] This article presents insight into the stability check for members loaded in a combination of compression and bending, in which - due to 2nd-order effects - also torsion occurs. A key decision in the opinion of the authors is the introduction of the stability parameter n* as the ratio of the total displacement and the 2nd-order part of displacement. They believe that this quantity can fulfill an `alarming function` when judging the stability of structural members. An iteration procedure in a number of clearly distinct steps results into a general formula for n*, in which all necessary data concerning member properties and load cases are covered.The member safety is inspected by a unity check, which relates occurring stresses to strength requirements. Also checks on displacement limits are described. This new method for compressive-flexural-torsional buckling is applicable for all existing building materials in structural engineering as long as elasticity is involved.Essentially, the calculations can be done in a short time using a pocket calculator, without the use of other utilities. It has been deliberately chosen not to elaborate the derived formulas too far, in order to preserve a clear view on cohesion and procedure.

[学科分类] 建筑学

[关键词] Building structures;structural members;stability;strength;stiffness;column buckling;flexural-torsional buckling;bending;twist