Page 44 - 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)

3.3 SOFTWARE APPROVAL & DESIGN GUIDELINES 3.3.2.2 GENERAL CONSIDERATIONS
3.3.1 SOFTWARE APPROVAL a. Slab Thickness
Specialist contractor/consultant shall use licensed software only. 1. Slab thickness should be decided based on the loads
Software used by the specialist contractor require CED certification and and spans.
approval prior to implementation in the design. The software could be 2. For normal loads in residential and commercial areas,
certified and approved following the below procedures: the thickness of flat slab should be proposed to be as
Specialist contractor shall submit original license for the software, along explained in Fig. (3.8) provided that the ultimate and
with user technical manual and all related technical sheets, via cover service limits requirements are met.
letter from the specialist. 3. Vibration shall be considered in the design of the
To ensure a better understanding of the software capability and offices areas, following the above mentioned codes.
performance enhancement, the specialist shall respond to all CED 4. Cubic strength for the concrete used in pre stressed
enquiries and if necessary to conduct a technical demonstration or/and slabs shall not be less than 40 N/mm2.
presentation as per the CED arrangement.
The specialist contractor will be notified on the final approval of the Total imposed Span/depth Span/depth
software as per the relevant discipline. Section Type load ratios Section Type Total imposed ratios
6m < L < 13 m
load
6m < L < 13 m
(kN/m)
(kN/m) (kN/m) (kN/m)
2.5 40 2.5 28
5.0 36 5.0 26
3.3.2 DESIGN GUIDELINES 10.0 30 10.0 23
> span/6
3.3.2.1 APPLIED DESIGN CODES 2.5 44 7. Ribbed slab 2.5 30
5.0 40 5.0 27
10.0 36 10.0 24
The following codes and report are permitted for design of post > span/3 8. One-way slab with narrow beam Slab Beam
tension slabs. Unlisted codes shall be submitted for approval 2.5 Slab Beam 2.5 42 18
45
25
prior to use in design. 5.0 40 22 5.0 38 16
34
13
10.0
span/5 10.0 35 18 > span/15
a. BS 8110 1997 structural use of concrete. 2.5 25
5.0 23
b. Technical Report (TR 43). 10.0 20
c. ACI-318. 2.5 28
5.0
26
10.0 23
d. Post Tension Manual, fifth and sixth edition. > span/3
e. Euro code 2. Fig. (3.8) Slab thickness
f. ASCE-7-5
g. IBC-2006 b. Concrete cover
1. Concrete cover shall comply with durability or fire
resistance requirements, whichever condition is the
more onerous.
2. The cover shall be measured to the outside surface of
the duct; the minimum net cover for bonded system
shall be 35 mm.
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