Formwork Design

• February 2021
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Solution To Assignment No.1 - Wall Formwork Design Calculation Determining Concrete Pressure acting on formwork K=(36/(7+16))sq= C2=0.45

Wi=0.6+(0.8-0.6)/5*h

Ai=10.0*Wi

(Mix w/retarder)

2.450 H = 6.0 m

R=6.75/A (Q=9/2= 4.5 m3/h, 2 trucks of 4.5 m3 in two hours)

Pmax=25(1.0*sqrt(R) + 0.45*K*sqrt(5.0-1.0*sqrt(R))) or D*h whichever is the smaller

Depth

Total Width Plan Area

h

Wi

m 0.00 1.00 2.00 3.00 4.00 5.00

m 0.600 0.640 0.680 0.720 0.760 0.800

Ai=10.0*Wi m2 6.000 6.400 6.800 7.200 7.600 8.000

Rate of Rise

Hydrostatic D*h

Pmax

(Assume lowest temperature for the max. design conc. Pressure)

(CIRIA Report 108) Design Pressure

Elev. above bottom

R m/h 0.750 0.703 0.662 0.625 0.592 0.563

kN/m2 77.69 77.19 76.73 76.31 75.93 75.57

kN/m2 0.00 25.00 50.00 75.00 100.00 125.00 P max

kN/m2 m 6.00 0.00 5.00 25.00 4.00 50.00 3.00 75.00 2.00 75.93 1.00 75.57 75.93 kPa

Elevation above bottom (m)

C1=1.0 (Wall Form)

Conc. Pressure Diagram

1

2

3

4

Design Concrete Pressure :

75.93, say 85 kPa throughout the height 5

2 marks

6

0.00

20.00

40.00

60.00

80.00

Conc. Pressure (kN/m2)

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Solution To Assignment No.1 - Wall Formwork Design Calculation WALL FORM DESIGN

Hydrostatic

Design Information Design Concrete Pressure (Refer to the "Concrete Pressure" Spread Sheet) Allowable Deflection not exceed Tie Rod Spacing not less than

kPa Span m

75.93 1/360 0.9

Design Conc. Pressure Diagram

75.93 kPa Conc. Stiffening Design Concrete Enevlope

Formwork Components Plywood (1-m width) Waling Soldier

Formwork Component

Recommeded Spacing (to the nearest 25 mm)

Formwork Component Spacing to be Used (m) udl (kN/m) Plywood 75.93 Waling 0.150 11.39 Soldier 1.325 100.61 Toe Rod 1.000 Max. Tension in each Tie Rod =75.93kPa *1.325*1.000 = Assessment Plan

Moment of Resistance (kNm) 0.46 2.025 10.5

Key Skills

F1

Communication, IT and Numeracy

F5

Analytical & Problem Solving

P1

Presentation & Autonomy

Bending Moment Coefficient 0.1 0.1 0.1

Bending Stiffness EI Shear Load (kN) (kNm2) 3.25 6.86 119.14 12.8 200.35 64.5

Shear Force Deflection Coefficient Coefficient 0.6 0.007 0.6 0.004 0.6 0.004

Max. Spacing (m) calculated from Bending Moment 0.246 1.333 1.022

Shear 0.151 1.873 1.069

Deflection 0.257 1.937 1.114

Max. Spacing (m) 0.151 (Waling) 1.333 (Soldier) 1.022 (Tie Rod)

Check Tie Rod Spacing Crtiterion N/A N/A N/A OK (Horizontal Tie Rod Spacing>0.90 m) OK (Vertical Spacing > 0.90 m)

100.61 kN Criteria Accuracy of Calculations & Sketching (3 mark) Loading Determinination (2 marks) & Correct Use of Formulas (2 marks) Neatness & Clarity in Presentation (1 mark) & Design Criteria Checks (2.5 marks) Total

Marks

7.0 3.5 10.5

Marks

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