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Steel Structure (1)
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courSe content
1- General layout
2- loadS
3-tenSion memberS
4-compreSSion memberS
5- deSiGn of beam
6- deSiGn of beam-column
aSSeSSment and GradinG policy:
• final exam …………. (40 markS)
• year work………………(60 markS)
…………….mid-term …..(30 markS)
……………..QuizzeS….(15 markS)
………….aSSiGnmentS….(15 markS)
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Introduction to steel
structures and general
layout
Truss
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Tube truss building (light weight steel truss)
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3- Easy to make extensions
Extension hanger
L Lo
4- Light weight
γ concrete= 2.5 t/m3 γ steel= 7.85 t/m3
The dimension of steel section still smaller than concrete section
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Tables of steel sections
Y or x is the
distance from the
neutral axis to any
given fibre.
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Truss
This span in the smaller length
between two parameters (B,L)
S = (5~8) m
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Purlins
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The correct direction of purlin position on truss system
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Angle between lower chord and diagonal
Tension or compression truss 'members according to bending moment diagram
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Used with small spans
Used with big spans
When a > 60 degree
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The need for
Bracing
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Due to forces(loads)
perpendicular to
main system
If there are no
horizontal bracing
between two trusses
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Horizontal bracing
Firstly the wind will be
resisted by Horizontal bracing
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Different shapes of HZ. Bracing
Purlin
Finally the vertical bracing will be added
to the system to carry and transfer the
loads from Horizontal bracing to the
ground (footing)
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After using horizontal and vertical bracing
Vertical Bracing
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Side girts & End girts
End – Gable section
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𝐋𝐜
H=
(𝟔 𝟖)
h ≥ 1.25 Put longitudinal bracing at the
cantilever edge
Vertical bracing
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Layout for portal frame
Span ≤ 25 m
In Portal Frame No longitudinal bracing
Frame instead of Truss members
The thickness of rafter (depth) assumed = 30 cm
Portal Frame
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