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1.1 Other: 2 Steel

The document provides loading specifications for various building materials and components, including 38mm asphalt, cladding, curtain walling and windows. It also lists load specifications for flooring and roofs in tenement rehabilitation contracts. The document further outlines rules of thumb, formulas and deflection limits for steel design, as well as guidelines for composite beam design using steel studs and concrete slabs.

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ashish
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74 views2 pages

1.1 Other: 2 Steel

The document provides loading specifications for various building materials and components, including 38mm asphalt, cladding, curtain walling and windows. It also lists load specifications for flooring and roofs in tenement rehabilitation contracts. The document further outlines rules of thumb, formulas and deflection limits for steel design, as well as guidelines for composite beam design using steel studs and concrete slabs.

Uploaded by

ashish
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as XLSX, PDF, TXT or read online on Scribd
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1.

1         Other
o   38mm Asphalt = 0.85 kN/m2
o   Cladding = 0.15 / 0.2 kN/m2
o   Curtain Walling = 1.0 / 0.5 kN/m2
o   Windows = 0.8 kN/m2

o   Tenement Rehabilitation Contracts - Floor Loading


§  Joists (265x63 @ 450 c/c) = 0.25 kN/m2
§  Boarding (25mm T&G) = 0.15 kN/m2
§  Plaster Ceiling = 0.35 kN/m2
§  Deadening (100mm Ash Fill) = 0.75 kN/m2
§  Total Dead = 1.5 kN/m2
§  Imposed = 1.5 kN/m2

o   Tenement Rehabilitation Contracts - Roof Loading


§  Slates = 0.5 kN/m2
§  Felt & Sarking = 0.10 kN/m2
§  Trusses = 0.15 kN/m2
§  Plaster Ceiling = 0.35 kN/m2
§  Total Dead = 1.1 kN/m2
§  Imposed = 0.6 kN/m2
§  Storage = 0.25 kN/m2

2           Steel
2.1         Rules of Thumb

1. Grade Ø S355 for major structures


2. Beams Ø Light Loading – Span/25; Medium – Span/20; Heavy – Span/15
3. Frame Form Ø Economics and ease of calculation
4. Stanchions Ø Portal Leg D ≈ H / 10
5. Columns Ø D ≈ No Storeys * 100 / 4 (rnd 50) NOT < 203
6. Economics Ø Deeper the Beam the more economical?
7. Eurocodes Ø As above

2.2         Formula
o   Tension Capacity, Pt = rt Ae
o   Steel Required =
Ac
0.95 fy
Ac
0.95 fy o   For quick element sizing based on d criteria

5wL4

I reqTorsion
384 EMoment,
dL
FeL
MT 
Natural
2 Frequency,
18 d = Self weight + dead + 10% imposed load
where
f 
d  = M*y / I
Stress,

2.3         Deflections
Portal Eaves – Metal cladding d ≤ h/150
Portal Eaves – Masonry d ≤ h/300
Portal Apex – d ≤ S/200
Dead Floor d ≤ 15mm
Imposed d ≤ S/360
Total d ≤ S/250 (S/300 Mangan Factor)

2.4         Composite Design
In composite design for 19mm Æ studs then minimum size of reinf is 10mm bars
Composite beams
Slab Perpendicular \Studs per trough
Slab Parallel \Studs @ 200mm c/c
Effective Width
Secondary = Spacing or Span/4
Primary = 0.8*Spacing or Span/4
Edge Beams – Half of above values plus projection of slab beyond the C/L of beam

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