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ICONSWhat is Concrete Formwork?

Concrete Formwork is the structure, usually temporary, used to contain poured concrete and to mold it to the required dimensions and support until it is able to support itself. It consists primarily of the face contact material and the bearers that directly support the face contact material.

Notation for Concrete Formwork

f_el = Mold plate bending strength [MPa]
f_ebk = Primary support beam bending strength [MPa]
f_eik = Secondary support beam bending strength [MPa]
f_kl = Mold plate shear strength [MPa]
f_kbk = Primary support beam shear strength [MPa]
f_kik = Shear strength of secondary support beam [MPa]
GK= Safety factor
p= Pressure on the formwork due to fixed and live loads [MPa]
E_l =Plate modulus of elasticity [mm ² ]
E_bk = Primary support beam modulus of elasticity [mm ² ]
E_ik = Secondary support beam modulus of elasticity [mm ² ]
A_l = Plate cross-sectional area [mm ² ]
A_bk = Primary support beam cross-section [ mm ² ]
A_ik = Secondary support beam cross-sectional area [mm ² ]
I_l = Plate section moment of inertia [mm ⁴ ]
I_bk = Primary support beam section moment of inertia [mm ⁴ ]
I_ik = Secondary support beam section moment of inertia [mm ⁴ ]
S_l = Plate section moment of inertia [mm ³ ]
S_bk = Primary support beam section moment of strength [mm ³ ]
S_ik = Secondary support beam section moment of strength [mm ³ ]
b_l = Formwork plate width
L_bk = Primary support beam spacing
L_ik = Secondary support beam spacing
N_d = Fastener tensile capacity or strut axial compressive capacity

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How to Design Concrete Formwork with Detailed Calculation?

Concrete formwork Design and carrier formwork scaffolding design calculation is below:​

The characteristic value is the Concrete formwork components' modulus of elasticity and strength value is the characteristic value. For the strength value, GK = 2.0 is accepted.

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• Secondary Beam Intervals according to primary support beam dimensions to be used in slab, beam, column, and shear wall formwork, L_ik ,

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• Rod Intervals to be used in column, shearwall, and beam side formwork, L_b

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N_d= Rod tensile capacity or prop axial pressure capacity

• The props sof of the beam formwork will be on each secondary support beam.

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• The Ƥ_d value used to determine the Prop Interval, L _d, varies according to the sequential use of the scaffoldings. The total number of stories (n) where the props are used sequentially, starting from the ground story, is entered as user-defined.

• If the number of primary beam, secondary beam, rod, or prop is 2, the interval values ​​are reduced by multiplying by 0.8.

• When calculating the prop interval, the total load (nG+Q) that will affect the props is increased by 10%.

• Prop interval for slabs,

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