Design Manual for FormDeck Suspended Slab System

Transcription

1 Issued : 1/3/2013 Release: N Design Manual for FormDeck Suspended Slab System Copyright 2013 Formcraft Pty Ltd All Rights Reserved 1

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9 Calculations for R- value of FormDeck General assumptions made in the calculations are : Concrete topping of 70mm Thermal Conductivity for EPS at density of 26 Kg/m 3 and mean temperature 23C is k = W/mK Thermal conductivity for Concrete at density 2850 Kg/m3 is k = 1.44 W/mK Thermal conductivity of Plasterboard is W/mK 3.4m/s wind and surface emittance = 0.9 R value = thickness (m) / k Outside air = Inside air = mm concrete = 0.07 / 1.44 = mm plasterboard = 0.01 / = Total non EPS contribution = mm EPS = mm EPS = mm EPS = 5.77 Over all thickness including concrete Overall thickness of EPS Average thickness of EPS R value of EPS R value of Total system FormDeck mm FormDeck mm FormDeck mm

10 FORMDECK - SPAN TABLES & CHARTS Design Input b ef Beam spacing (b ef ) 600 mm t f Average Beam width (b w ) 100 mm Slab Thickness (t f ) 70 mm Concrete Model (overall slab thickness, mm) D Slab mesh SL62 G superimposed 0.25 kpa EPS Concrete density 2400 kg/m 3 f' c 25 MPa 50mm f cm 29.6 MPa b w Bottom cover 20 mm ψ l 0.4 Limit State Capacity (Bending and Shear) N-bar / beam N-bar FormDeck Beam Average φm u φv uc Total Max. allowable Live Load Q (kpa) Area / m model D D /m width /m width G Span (m) (mm 2 /m) (mm) (mm) (knm/m) (kn/m) (kpa) N N N N N N N N N N N N Values shaded are limited by shear strength Long Term Total Deflection Limits (Span/250) - Single Span N-bar / beam N-bar FormDeck Beam Average Total Max. allowable Live Load Q (kpa) Area / m model D D G Span (m) (mm 2 /m) (mm) (mm) (kpa) N N N N N N N N N N N N Values shaded are limited by strength - see Limit State Capacity tables for maximum allowable loads NOTES 1. ALL values given are for ESTIMATING PURPOSES ONLY. Detailed calculations by a suitably qualified Engineer are to be performed based from first principles for each specific project 2. Deflections may be reduced by providing continuous spans, increased area of top steel and increased concrete strength. 3. Mesh type for slab to be chosen accordingly for imposed loading and exposure conditions 4. A 0.25kPa superimposed Dead Load (G) has been incorporated, to account for ceiling, and services loads.

11 16.0 Formdeck - Strength and Long Term Total Deflection Limits, 2-N12 bars/ beam Concrete f'c = 25MPa, Superimposed Dead Load (G) = 0.25kPa, Single span, ψ l =0.4, Deflection limit = span / 250 Maxim mum Live Load - Q (kpa) model Strength 250 model Strength 300 model Strength 350 model Strength 200 model Deflection 250 model Deflection 300 model Deflection 350 model Deflection Span (m)

12 16.0 Formdeck - Strength and Long Term Total Deflection Limits, 2-N16 bars/ beam Concrete f'c = 25MPa, Superimposed Dead Load (G) = 0.25kPa, Single span, ψ l =0.4, Deflection limit = span / 250 Maxim mum Live Load - Q (kpa) model Strength 250 model Strength 300 model Strength 350 model Strength 400 model Strength 200 model Deflection 250 model Deflection 300 model Deflection 350 model Deflection 400 model Deflection Span (m)