الفهرس 
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Abstract
Cold•fonned steel structural members are commonly manufactured with holes to odate plumbing, electrical, and heating conduits in the walls and ceilings of
In this paper, experimental testing was performed on 68 C-section cold-formed steel with un-stiffened rectangular web-holes. Four Steel Stud Manufactures Association MA) cross section types: 800S200-33, 800S200-43, 1000S162-54, and 1200S162-97 evaluated to explore the influence of holes on local, distortional, and global buckling modes. Hole depth was varied in the tests to identify trends in ultimate strength.
Currently two basic design methods for cold-formed steel members are formally IVIilable: the traditional Effective Width Method, also known as the Main Specification and the Direct Strength Method (DSM) which was formally adopted in North ’can design specifications in 2004 by using CUFSM software program which can
’de the elastic buckling loads that the Direct Strength Method requires.
A modification to the AISI Direct Strength Method equations for beams with slotted holes was used in this paper for the tested specimens to be compared against the aperimental results and the results from the Effective Width Method.
The objective of this paper is to study the flexural strength prediction for beams with un¬lliffened web holes using the Direct Strength Method and the Effective Width Method, and brief comparison of the Direct Strength Method with the Effective Width Method