CCFSS Library (1939 - present)

Alternative Title

15th progress report


I. SCOPE OF THIS REPORT In the preceding 14th Progress Report a method was proposed to determine the forces acting in the welds in the web of I-beams composed of two channels. This method essentially has been based on the magnitude "e", the distance of the flexural center from the axis of the web. A formula for "e" was given which applies to symmetrical channels of uniform thickness. In the present report this expression for "e" will be simplified and a more general expression will be derived for "e" for symmetrical channels with web thickness differing from flange thickness. Furthermore, a method will be proposed to apply this approach to channels non-symmetrical about the horizontal axis. In addition to the work reported herein, an analytical investigation of the lateral stability of unsymmetrical thin walled I-beams has been under way for some time. Of necessity this analysis has to be of considerably wider scope than is required by the problems under consideration. The essential parts of this investigation are now worked out. They are expected to be helpful in the interpretation of the coming beam tests and will be reported on in connection therewith.


Male, Milton


Civil, Architectural and Environmental Engineering


American Iron and Steel Institute

Research Center/Lab(s)

Wei-Wen Yu Center for Cold-Formed Steel Structures

Publication Date

01 Jan 1941

Document Version

Final Version


Fifteenth Progress Report

Document Type

Technical Report

File Type