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September 28, 2023 16:29
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A gist of formwork formulas from CIRIA 108: Derivation of Concrete Pressure in Formwork
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/**Temperature coefficient based on CIRIA 108 - Derivation of Concrete Pressure in Formwork | |
*/ | |
Get_Temperature_Coefficient_K = LAMBDA(concrete_temp_at_placing, | |
LET( | |
T, concrete_temp_at_placing, | |
(36 / (T + 16))^2 | |
) | |
); | |
/**Max design pressure of concrete in formwork based on CIRIA 108 - Derivation of Concrete Pressure in Formwork | |
*/ | |
Get_Max_Design_Pressure = LAMBDA(formwork_coefficient, concrete_coefficient, concrete_density, formwork_height, pour_height, concrete_temp_at_placing, rate_concrete_rise, | |
LET( | |
C_1, formwork_coefficient, | |
C_2, concrete_coefficient, | |
D, concrete_density, | |
h_formwork, formwork_height, | |
h_pour, pour_height, | |
T, concrete_temp_at_placing, | |
R, rate_concrete_rise, | |
K, Get_Temperature_Coefficient_K(T), | |
IF( | |
C_1 * SQRT(R) > h_formwork, | |
D * h_pour, | |
MIN( | |
D * h_pour, | |
D * (C_1 * SQRT(R) + C_2 * K * SQRT(h_formwork - C_1 * SQRT(R))) | |
) | |
) | |
) | |
); | |
/**Rate of concrete rise uniformly based on CIRIA 108 - Derivation of Concrete Pressure in Formwork | |
*/ | |
Get_Rate_of_Rise_Uniform = LAMBDA(pumping_rate, length_of_wall, thickness_of_wall, | |
pumping_rate / (length_of_wall * thickness_of_wall) | |
); |
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