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slab formwork design worksheet
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Welcome to E-Z Slab 2006 an interactive spreadsheet for the
design of timber formwork systems for cast in place elevated concrete slabs
Design Load: - Calculated combined dead and live loads to be used for the design Acknowledgements
Plywood - Calculated and practical joist spacing based on plywood properties All formulas, calculations and tables
are based on ACI SP-4,Joist-Stringer Formwork for Concrete, 7th ed.
- Calculated and practical stringer spacing based on joist properties
Stringer-Shore Student Developers - Calculated and practical shore spacing based on stringer properties V. Elliot, A. Murray, D. Reis,
A. Hopkins & E. KingShore
- Calculated axial load & capacity for selected shore size & properties Faculty DeveloperWilliam "Bill" C. Epstein
Horizontal Strut Brace Full Professor, CM Dept.
- Calculated axial load & capacity for selected brace size & properties Cal Poly, San Luis Obispo
Calculation Summary - Bending, deflection, shear, bearing & axial load calculation results
Office: (805) 756-2797
Cell: (805) 459-9087
Email: wepstein@calpoly.edu
General Notes for Best Use of the E-Z Slab 2005 Spreadsheet
1. The E-Z Slab 2005 spreadsheet was designed to run in Microsoft Excel and is best viewed at a screen resolution of 1024 by 768 pixels. Some users may need a higher screen resolution to view the entire tabbed sheet area.
2. Design process of the E-Z Slab 2005 spreadsheet is based on data and procedures given in ACI SP-4
SUMMARY at any point to view the calculation associated with any sheet of interest.
using the "page up" and "page down"keys or by using the mouse wheel.
the slenderness ratios of the lateral braces in both directions.
cell using the arrow keys.
Formwork for Concrete, 7th edition. Beams are calculated using the simplification of three or more continuous spans uniformly loaded. To take full advantage of this spreadsheet, the user should begin with the sheet tabbed LOAD (at the bottom of the screen), and move step by step to the right through the tabs, ending with BRACE LOAD. The user may also click on the CALCULATION
3. Except for the CALCULATION SUMMARY, the sheets are designed for single screen viewing and do not have scroll bars. The CALCULATION SUMMARY has six tables that can be viewed separately
4. The user enters data either by typing directly into the double-blue-lined cells or by selecting alternatives from a list box. Cell values calculated by the computer are bordered by a double red line. The double- green-lined cell in the JOIST-STRINGER sheet checks the bearing between the joists and stringers. The double-green-lined cell in the STRINGER-SHORE sheet checks the bearing between the stringers and shores. The double-green-lined cell in the STRINGER-SHORE sheet checks if the shore passes in axial capacity as well as the slenderness ratio. The double-green-lined cell in the BRACE LOAD sheet checks
5. Sheets which contain more than one double-blue-lined cell will allow the user to navigate from cell to
Pressure
Vertical Load on Formwork
150
50
8
8
8
158.0
Fill in the Following Variables:
Weight of Concrete (lb/cubic foot):
Minimum Construction Live Load (lb/square foot):
i Thickness of Elevated Slab (inches):
i Estimated Weight of formwork (lb/square foot):
Ceiling Height (feet):
i Design Vertical Load (lb/square foot):
Plywood
Plywood Thickness and Joist Spacing
All Plywood is Classified as Plywood B-B Class I Sheathing
Standard
Plywood
Load Duration Thickness
(Inches)
Weak / Strong Direction
Calculated Maximum Joist Spacing: 20.8 Inches
Enter Actual Joist Spacing: 19.2 Inches
Joists-Stringers
Joist Size and Stringer Spacing
Species and Grade Moisture Content
Load Duration
Nominal Size of Joist
Finish of Joist
Calculated Maximum Stringer Spacing: 76.3 Inches
Enter Actual Stringer Spacing: 30.0 Inches
Bearing Check Between Joist and Stringer: pass
0
Stringer-Shore
Stringer Size and Shore Spacing
Species & Grade Moisture Content
Load Duration
Nominal Size of Stringer
Finish of Stringer
Calculated Maximum Shore Spacing: 94.7 Inches
Enter Actual Shore Spacing: 36.0 Inches
Bearing Check Between Stringer and Shore: pass
0
Shore
Shore Size
Note: All Shoring is assumed to be unbraced
Species & Grade Moisture Content
Load Duration
Nominal Size of Shore
Allowable Axial Load: pass
Finish of Shore
Allowable Slenderness Ratio: pass
Shore
Horizontal Strut Brace
Species & Grade Moisture Content
Load Duration
Nominal Size of Strut
Finish of Strut
(DOUGLAS FIR-LARCH) No. 2, 2-4 in. thick, 2 in. and wider(DOUGLAS FIR-LARCH) Construction, 2-4 in. thick, 2-4in. wide(DOUGLAS FIR-SOUTH) No. 2, 2-4 in. thick, 2 in. and wider(DOUGLAS FIR-SOUTH) Construction, 2-4 in. thick, 2-4in. wide(SOUTHERN PINE) No. 2, 2-4 in. thick, 2-4 in. wide(SOUTHERN PINE) No. 2, 2-4 in. thick, 5-6 in. wide(SOUTHERN PINE) No. 2, 2-4 in. thick, 8 in. wide(SOUTHERN PINE) Construction, 2-4 in. thick, 2-4in. wide(SPRUCE-PINE-FIR) No. 2, 2-4 in. thick, 2 in. and wider(SPRUCE-PINE-FIR) Construction, 2-4 in. thick, 2-4in. wide(HEM-FIR) No. 2, 2-4 in. thick, 2 in. and wider(HEM-FIR) Construction, 2-4 in. thick, 2-4in. wide
Horizontal Load for Bracing Design90 ft
<------Joists------>
60 ft 194.4 plf
N
129.6 plf
North-South Direction East-West Direction
129.6
36.0(Shore Spacing)
pass
27.7
2% of Concrete DL (lb):
2% of Formwork DL (lb):
Lateral Force in N/S Direction (plf): Lateral Force in N/S Direction (plf):
Maximum Unbraced Length (in): i Maximum Unbraced Length (in):
Allowable Slenderness Ratio: Allowable Slenderness Ratio:
i Maximum Tributary Length (ft): Maximum Tributary Length (ft):
Horizontal Load for Bracing Design
90.0
60.0
10800.0
864.0
East-West Direction
194.4
30.0(Stringer Spacing)
pass
24.4CONTROLLING
i Length of Slab (ft):
i i Width of Slab (ft):
2% of Concrete DL (lb):
2% of Formwork DL (lb):
i Joist Orientation:
Lateral Force in N/S Direction (plf):
i Maximum Unbraced Length (in):
Allowable Slenderness Ratio:
Maximum Tributary Length (ft):
CALCULATION SUMMARY
Page 11
Allowable Plywood Spans Determine Joist Spacing
Bending 24.6 Rolling Shearsize: 3/4" size: 3/4"Fb: 1545 Fs: 57
S: 0.412 lb/Q: 6.762w: 158.00 w: 158.00
Adjustment: 1.25 Adjustment: 1.25
Alternate Fb: Alternate Fs:
l / 360 Deflection 20.8 Deflectionsize: 3/4" size: 3/4"
E: 1500000 E: 1500000I: 0.197 I: 0.197
w: 158.00 w: 158.00Adjustment: 1 Adjustment: 1
Alternate E: Alternate E:
Minimum Value: 20.8
Allowable Joist Spans Determine Stringer Spacing
Bending 76.3 Shearsize: 3x6 size: 3x6Fb: 975 Fv 150
S: 12.6 d 5.5w: 252.80 w: 252.80
Adjust (Moisture): 1 bd: 13.75Adjust (Use): 1 Adjust (Moisture): 1Adjust (size): 1 Adjust (Use): 1
Alternate Fb: Alternate Fv:
l / 360 Deflection 95.1 Deflection
D = 1/16''
D = 1/4''
CALCULATION SUMMARY
Page 12
size: 3x6 size: 3x6E 1300000 E 1300000I: 34.66 I: 34.66
w: 252.80 w: 252.80Adjust (Moisture): 1 Adjust (Moisture): 1
Adjust (Use): 1 Adjust (Use): 1
Alternate E: Alternate E:
Minimum Value: 76.3
Allowable Stringer Spans Determine Shore Spacing
Bending 94.7 Shearsize: 3x8 size: 3x8Fb: 900 Fv 180
S: 21.9 d 7.25w: 395.00 w: 395.00
Adjust (Moisture): 1 bd: 18.12Adjust (Use): 1.25 Adjust (Moisture): 1Adjust (size): 1.2 Adjust (Use): 1.25
Alternate Fb: Alternate Fv:
l / 360 Deflection 115.8 Deflectionsize: 3x8 size: 3x8
E 1600000 E 1600000I: 79.39 I: 79.39
w: 395.00 w: 395.00Adjust (Moisture): 1 Adjust (Moisture): 1
Adjust (Use): 1 Adjust (Use): 1
Alternate E: Alternate E:
Minimum Value: 94.7
D = 1/4''
CALCULATION SUMMARY
Page 13
Bearing Joists-Stringers Bearing Stringers-Shores
w: 632.00 w: 1185.00Width of Joist: 2.5 Width of Stringer: 2.5
Width of Stringer: 2.5 Width of Shore: 3.5Contact Area: 6.25 Contact Area: 8.75
Actual Stress (psi): 101.12 Actual Stress (psi): 135.43Allowable Stress (psi): 405 pass Allowable Stress (psi): 625
(not adjusted) (not adjusted)
SHORESAxial Load and Slenderness Test
E: 1,500,000
Alternate E:
Fc: 1,650
Alternate Fc:d 2.5
le: 96.00le/d: 38.40 pass
Fc Adjust (Moisture): 1Adjust (Use): 1.25Adjust (size): 1
x: 0.1480
CALCULATION SUMMARY
Page 14
Cp: 0.1432Area: 8.75
axial Load Capacity: 2583.9 pass
Total Load 1185.0
HORIZONTAL BRACES
Axial Load, Slenderness Test & Tributary Length
North-South Direction East-West Direction
E: 1500000 E: 1500000
Alternate E: Alternate E:
Fc: 1650 Fc: 1650
Alternate Fc: Alternate Fc:d 1.5 d 1.5
le: 36.00 le: 30.00le/d: 24.00 pass le/d: 20.00
Fc Adjust (Moisture): 1 Fc Adjust (Moisture): 1Adjust (Use): 1 Adjust (Use): 1Adjust (size): 1 Adjust (size): 1
x: 0.4735 x: 0.6818Cp: 0.4147 Cp: 0.5485
Area: 5.25 Area: 5.25Axial Load Capacity: 3592.5 Axial Load Capacity: 4751.6
Max. Tributary Length: 27.7 Max. Tributary Length: 24.4
CALCULATION SUMMARY
Page 15
Allowable Plywood Spans Determine Joist Spacing62.5
21.2
Allowable Joist Spans Determine Stringer Spacing
119.8
93.9
CALCULATION SUMMARY
Page 16
Allowable Stringer Spans Determine Shore Spacing124.6
108.8
CALCULATION SUMMARY
Page 17
Bearing Stringers-Shores
pass
CALCULATION SUMMARY
Page 18
HORIZONTAL BRACES
Axial Load, Slenderness Test & Tributary Length
East-West Direction
pass
CONTROLLING
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