الفهرس 
LITERATURE REVIEWOnly 14 pages are availabe for public view
 |  | from | 363 |  |  |
| | | from | 363 | | |
Abstract
Cold-formed steel sections are nowadays widely used in fields of
construction because of their relatively light weight, high strength to
weight ratios, saving of material, ease of fabrication, and availability in a
variety of sectional shapes. The cold-formed steel sections are used as
columns or studs in the construction of walls and partitions in residential,
commercial and industrial buildings. These steel studs are often
connected to bracing or sheathing material such as gypsum boards where
the gypsum boards provide lateral and rotational restraint to the studs
thus improving their axial capacity.
The main aim of this research is to study the axial behavior of these coldformed
steel wall studs taking into consideration the effect of the gypsum
sheathing on their axial capacity and to study the effect of the various
parameters affecting the compression capacity of the studs.
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. Another finite element
model is proposed representing the whole assembly including the steel
studs, the gypsum boards and the screws assembled together as in the
actual construction. The results of this model have been compared with
the results of the previous model to check the accuracy of using the
model with springs over a wide parametric study.
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 two
finite element models have been used through the parametric study. A
comparison between the ultimate loads of specimens of the parametric study obtained by the two models is presented.
Some design equations have been suggested to calculate the ultimate
loads of the gypsum sheathed studs.