Page 60 - Building Regulation and Design Guidelines - Structural (Grey Code)

SECTION: 4 STRUCTURAL DESIGN GUIDELINES - STEEL STRUCTURES SECTION: 4 STRUCTURAL DESIGN GUIDELINES - STEEL STRUCTURES

All beams designed 1. Design calculations and details of all parts (See Figure (4.3)) of a
to act as ties
steel industrial building including foundations shall be submitted.
Tie anchoring
column A 2. Footings shall be designed to solely resist the horizontal thrust from
the portal frames. Hair pin bars connecting pedestal to the grade
slab for horizontal restraint shall be avoided.
3. A minimum footing effective depth of 300mm for all footings with
A
reinforcement cover meeting the durability requirements and the
recommendations in the soil investigation report shall be provided.
4. Connections and loading drawings shall be provided with the input
Fig (4.2) Tying of Columns – All beams including secondary beams and output from the applicable steel design software.
used as Ties
5. All steelwork drawings shall be properly coordinated with the
4. All horizontal ties, and all other horizontal members, should be architectural and services drawings. Bracings shall not foul with
capable of resisting a factored tensile load, which should not be openings & windows. A minimum of two bays shall be braced.
considered as additive to other loads, of not less than 75 kN.
6. For built up sections, thickness of structural steel members shall
5. Each portion of a building between expansion joints shall be not be less than 6mm for main members and 4mm for secondary
treated as a separate building. members.
6. For special buildings where it is stipulated to be designed to avoid 7. Anti-sag rods shall be a minimum of 16mm diameter and the
disproportionate collapse, all requirements with regard to tying of maximum spacing of rods shall not exceed 3.8m. The roof bracing
columns, continuity of columns, resistance to horizontal forces, rods used shall be of 20mm minimum diameter.
notional removal of column, accidental loading and key element
design etc. shall be carefully studied and designed as required by 8. Wall wind bracing members shall be rolled steel sections such
the relevant sections of codes. as angles or pipes. Rods or cables shall not be used as wall wind
bracing elements.
4.4 GENERAL GUIDELINES FOR INDUSTRIAL STEEL STRUCTURES
RIDGE ROOF PURLIN
ROOF SYSTEM EAVE STRUT
RIGID FRAME COLUMN
GUTTER RIGID FRAME
EAVE HEIGHT CLEAR SPAN

Wall Bracings – Angle, Pipes or Suitable steel
sections only. Rods or cables shall not be used
CMU WALL
GIRT ENDWALL FRAME
BRACING ENDWALL COLUMN
ENDWALL RAFTER Fig (4.4). Wall Bracing
BAY SPACING
ENDWALL
SIDEWALL ENDWALL CORNER
COLUMN 9. An elevation view showing the load transmission from the wind
Fig (4.3). Parts of a Typical Steel Industrial Building
bracing to the ground shall be submitted.
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