Masters Theses


"The purpose of this study is to determine the length of butt welds required to develop the full plastic section modulus of a 6 WF 20 rolled section of A-36 steel. The members were electric arc welded with LR 6070 electrodes. Two-point loading was used to develop a zone of pure moment with zero shear where these members were joined.

At the cross-section to be welded, all the flange edges were prepared to receive a single-vee butt weld and the webs were prepared for a double-vee butt weld. In all cases the full length of the flange was welded. However, in some cases run out tabs were used and omitted in others. The double-vee butt welds of the web were started at the flange weld and extended for variable lengths symmetrically towards the central axis of the section. The run-out tabs, when used, were trimmed but in no case were the welds ground or polished. All welding was performed in accordance with the Lincoln Electric Company's "Procedure Handbook of Arc Welding Design by certified welders.

Of the five welded specimens, the rolled section with run out tabs and the web unwelded, developed a plastic section modulus that was 1% less than the fully plastic section modulus of the uncut beam. The moment-curvature relationship of this type connection was very similar to the moment-curvature relationship 9f the uncut specimen"--Abstract, p ii


Petro, Louis G.

Committee Member(s)

Senne, Joseph H.
Davidson, Robert F., 1911-1971
Parry, Myron G.


Civil, Architectural and Environmental Engineering

Degree Name

M.S. in Civil Engineering


University of Missouri at Rolla

Publication Date



vii, 51 pages

Note about bibliography

Includes bibliographical references (pages 49-50)


© 1964 Paul George Hayes, All rights reserved.

Document Type

Thesis - Open Access

File Type




Thesis Number

T 1567

Print OCLC #