Page 50 - Building Regulation and Design Guidelines - Structural (Grey Code)

SECTION: 3 GUIDELINES FOR PRE STRESSED CONCRETE WORKS (SLABS) SECTION: 3 GUIDELINES FOR PRE STRESSED CONCRETE WORKS (SLABS)

1. Each element must be stable after erection and offer
resistance to wind, accidental impact, and loads that may
be imposed due to other construction operations, Fig
(3.15).

Panel Loading

Gravity Loading
Fig. (3.16a) Transporting single-story panels

Seismic Loading
Parallel to Panel
Face

Seismic or
Wind Loading
Perpendicular
to Panel Face
Fig. (3.16b) Transporting of long panels

Fig. (3.15) Example of Precast panel with Earthquake loading

2. Surfaces shall intend to remain free of discernible cracks (1-x) x x x
by limiting the flexural tension to the modulus of rupture
modified by a suitable safety factor.
3. The arrangement of temporary bracing should not interfere M 1 M 1
with adjacent erection and other construction processes.
Bracing must be maintained until permanent connections
M 2 M 2
are completed. (a) One End Cantllevered (b) Both End Cantllevered
4. Please refer to BS8110-1997 section 6.2.11 and PCI Section: x= 1 1+ y b 1+ y b x= 1
5.2.4.2. 2 y t y t 2 1+ 1+ y b y t
Where:
5. The method used for transporting pre cast concrete y b =
y t =
products shall be considered in the structural design
including size and weight limitations and the dynamic
effects imposed by road conditions, Figs. (3.16 a,b & c). Fig. (3.16c) Equations for Equal Tensile Stresses at top and bottom of member

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