STRUCTURAL BEHAVIOR OF COLD-FORMED-STEEL SHEARWALLS SHEATHED WITH FERRO-CEMENT BOARDS
BASEL MOHAMMAD ELSAMMAN;
Abstract
Summary :
The aim of this thesis is to study the cold formed steel (CFS) shear wall under
horizontal loads. To perform this study, three main research points are considered.
The first part is the buckling strength of the chord studs that are commonly made of
built up I-section. Built-up I-sections are presented using a numerical finite element
analysis for the calculation of axial strength of cold formed steel built-up I-sections
composed of two back-to-back channels or stiffened web sigma (Σ). The results of
the parametric study state that the design specification noted in the AISI are
generally conservative for long and medium length columns, but may give unconservative
estimates
for
some
of
the
short
columns.
The
second
part
of
the
thesis
is
the study of the steel braced CFS shear walls .Braced CFS shear walls are
presented using a verified finite element method that represents the full scale
braced shear walls under seismic loads and to study their ductility. A parametric
study is performed to investigate the Response Modification Factor (R) of the CFS
braced shear-walls. The parametric study showed that the North American
Specification is about 20% conservative in estimating the (R) Factor. The third part
of this thesis concerned in the sheathed CFS shear walls. In this part, a new type of
CFS shear wall that are sheathed with Ferro-cement reinforced Boards is studied
experimentally and analytically. Finite Element (FE) model is generated to simulate
the experimental work. The model showed an accurate estimation for the
experimental results of the ultimate load and stiffness. The FE model is applied on
different sheathing material tested by other researchers and also gave accurate
results. The whole study of the sheathed CFS shear walls showed that, Compared to
sheathed Gypsum, OSB or Braced shear walls, the Ferro-cement boards are also a
very reliable sheathing material with a good serviceability limit under horizontal
loads.
The aim of this thesis is to study the cold formed steel (CFS) shear wall under
horizontal loads. To perform this study, three main research points are considered.
The first part is the buckling strength of the chord studs that are commonly made of
built up I-section. Built-up I-sections are presented using a numerical finite element
analysis for the calculation of axial strength of cold formed steel built-up I-sections
composed of two back-to-back channels or stiffened web sigma (Σ). The results of
the parametric study state that the design specification noted in the AISI are
generally conservative for long and medium length columns, but may give unconservative
estimates
for
some
of
the
short
columns.
The
second
part
of
the
thesis
is
the study of the steel braced CFS shear walls .Braced CFS shear walls are
presented using a verified finite element method that represents the full scale
braced shear walls under seismic loads and to study their ductility. A parametric
study is performed to investigate the Response Modification Factor (R) of the CFS
braced shear-walls. The parametric study showed that the North American
Specification is about 20% conservative in estimating the (R) Factor. The third part
of this thesis concerned in the sheathed CFS shear walls. In this part, a new type of
CFS shear wall that are sheathed with Ferro-cement reinforced Boards is studied
experimentally and analytically. Finite Element (FE) model is generated to simulate
the experimental work. The model showed an accurate estimation for the
experimental results of the ultimate load and stiffness. The FE model is applied on
different sheathing material tested by other researchers and also gave accurate
results. The whole study of the sheathed CFS shear walls showed that, Compared to
sheathed Gypsum, OSB or Braced shear walls, the Ferro-cement boards are also a
very reliable sheathing material with a good serviceability limit under horizontal
loads.
Other data
| Title | STRUCTURAL BEHAVIOR OF COLD-FORMED-STEEL SHEARWALLS SHEATHED WITH FERRO-CEMENT BOARDS | Authors | BASEL MOHAMMAD ELSAMMAN | Issue Date | 2018 |
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