Effective Length of Columns - AISC 360-16

Описание: An updated version of this presentation is available here:    • Effective Length of Columns - AISC 360-22  

This presentation addresses the determination of effective lengths of columns using alignment charts consistent with the effective length method in Appendix 7 of the 2016 AISC Specification. Building upon earlier lectures which addressed Euler buckling of columns and the basis of the flexural buckling provisions included in the AISC specification, the idea of an effective length factor is described in more detail and a procedure is introduced to determine the effective length factor for columns and various types of steel frames.

0:00 – Introduction
0:33 – Definition of Effective Length
1:38 – Acceptable Methods of Design for Stability
3:09 – Restraint of Columns in Steel Frames
5:51 – Introduction of Alignment Charts
9:12 – Rotational Restrain at Column Bases
11:08 – In-Plane vs Out-of-Plane Restraint
13:32 – Stability Columns vs Gravity Columns / Leaning Columns
14:34 – General Procedure for Determining an Effective Length Factor
15:28 – Assumptions and Limitations
16:04 – Stiffness Reduction Factor
18:06 – General Procedure for Using the Stiffness Reduction Factor
20:06 – Influence of Various Connection Types
25:06 – Conclusions

Keywords:
ASCE 7-16: 2016 American Society of Civil Engineers Minimum Design Loads and Associated Criteria for Buildings and Other Structures
AISC 360-16: American Institute of Steel Construction 2016