الفهرس 
ORIGIN OF THE BEAM-COLUMN EQUATIONOnly 14 pages are availabe for public view
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Abstract
This research studies the structural behavior of cold-formed steel wall studs taking into consideration the effect of gypsum board on their capacity under the influence of combined axial load and bending moment. Cold-formed steel sections are widely used in building construction, roof, floor and wall panels due to their high strength, ease of fabrication and construction as well as their relatively lightweight. Cold-formed steel wall frame systems are commonly used as the load bearing and non-load bearing walls in residential, industrial and commercial building construction. Gypsum board is a common lining material used in combination with cold-formed steel studs (C or Z-sections). These gypsum boards are attached to both flanges of the stud with screws at regular intervals.
The main aim of this research is to study the structural behavior of steel wall studs under the influence of combined axial load and bending moment taking into consideration the effect of gypsum sheathing on their capacity. The effect of various parameters such as screw spacing, thickness of studs, ratio of acting moment to nominal yield moment and the geometry of steel sections are studied.
For this purpose, the finite element computer package (Cosmos M/V2.6) is used to model the gypsum sheathed studs. A finite element model is presented including steel studs with gypsum boards modeled as springs. A verification of the model has been performed by comparing its results versus the results of some experimental studies.
An extensive parametric study is conducted to assess the effect of the various parameters on the axial capacity of the studs. The behavior of these studs is illustrated and tabulated in different graphs and tables showing different relations based on the finite element results. The finite element model has been used through the parametric study. Some design equations are proposed to obtain the axial capacity of gypsum sheathed beam-column steel wall studs.