Creep and shrinkage

The following functions are related to calculation of creep and shrinkage.

Creep

structuralcodes.codes.ec2_2004.phi(h_0: float, f_cm: float, RH: int = 50, cement_class: Literal['R', 'N', 'S'] = 'R', t0: int = 7, t: int = 18263) → float[source]

Calculates the creep number.

EN 1992-1-1:2004, Eq. (B.1).

Parameters:

  • h_0 (float) – The product of 2 times the cross-sectional area divided by the exposed circumference according to (B.6).

  • f_cm (float) – The mean concrete strength,

  • RH (int) – The relative humidity in percent, defaults to 50%.

Keyword Arguments:

  • cement_class (str) – The cement class, defaults to ‘R’. Possible values: ‘R’, ‘N’, ‘S’,

  • t0 – The age of the concrete at the time (in days) of loading.

  • t – The age of the concrete at the time (in days) of evaluation (50 years default).

Returns:

The creep value for the load, phi(t, t0).

Return type:

float

Raises:

ValueError – checks if the cement class equals R, N or S.

structuralcodes.codes.ec2_2004.beta_c(t0: float, t: float, beta_H: float) → float[source]

Calculates the factor beta_c.

EN 1992-1-1:2004, Eq. (B.7).

Parameters:

  • t0 (float) – The concrete age in days a the time of loading.

  • t (float) – The concrete age at the evaluated time.

  • beta_H – Parameter defined in (B.8).

Returns:

Parameter defined by Equation (B.7), beta_c.

Return type:

float

structuralcodes.codes.ec2_2004.beta_H(h_0: float, f_cm: float, RH: int) → float[source]

Calculates beta_H.

EN 1992-1-1:2004, Eq. (B.8a and b).

Parameters:

  • h_0 (float) – The effective cross sectional thickness, Equation (B.6).

  • f_cm (float) – The mean concrete strength.

  • RH (int) – The relative humidity in percent.

Returns:

The calculation parameter defined in (B.8).

Return type:

float

structuralcodes.codes.ec2_2004.t0_adj(t0: float, alpha_cement: float) → float[source]

Calculates the adjusted age of the concrete.

EN 1992-1-1:2004, Eq. (B.9).

Parameters:

  • t0 (float) – The concrete age in days at the time of loading.

  • alpha_cement (float) – Exponent derived from the sement type.

Returns:

The adjusted age of the concrete.

Return type:

float

structuralcodes.codes.ec2_2004.beta_fcm(f_cm: float) → float[source]

Calculates beta_f_cm.

EN 1992-1-1:2004, Eq. (B.4).

Parameters:

f_cm (float) – The mean concrete strength.

Returns:

The factor defined in Equation (B.4).

Return type:

float

structuralcodes.codes.ec2_2004.phi_RH(h_0: float, f_cm: float, RH: int) → float[source]

Calculates phi_RH.

EN 1992-1-1:2004, Eq. (B.3).

Parameters:

  • h_0 (float) – The effective cross sectional thickness, Equation (B.6).

  • f_cm (float) – The mean concrete strength.

  • RH (int) – The relative humidity in percent.

Returns:

The calculation parameter (B.3).

Return type:

float

Shrinkage

structuralcodes.codes.ec2_2004.eps_cs(h_0: float, f_cm: float, cement_class: Literal['R', 'N', 'S'] = 'R', RH: int = 50, t_S: int = 28, t: int = 18263) → float[source]

Calculates the shrinkage strain.

EN 1992-1-1:2004, Eq. (3.8).

Parameters:

  • h_0 (float) – The effective cross sectional thickness, Equation (B.6).

  • f_cm (float) – The mean concrete strength.

  • cement_class (str) – The cement class, defaults to ‘R’. Possible values: ‘R’, ‘N’, ‘S’.

Keyword Arguments:

  • RH (int) – The relative humidity in percent, defaults to 50.

  • t_S (int) – the number of days when shrinkage begins, default: 28 days.

  • t (int) – the concrete age at the time (in days) of evaluation, default: 50 years.

Returns:

The shrinkage. Given as absolute, not in percent or ppm.

Return type:

float

Raises:

ValueError – Checks if the cement class equals R, N or S.

structuralcodes.codes.ec2_2004.beta_RH(RH: int, RH_0: int = 100) → float[source]

Calculates beta_RH.

EN 1992-1-1:2004, Eq. (B.12).

Parameters:

RH (int) – The relative humidity in percent.

Keyword Arguments:

RH_0 (int) – The reference relative humidity, default: 100%.

Returns:

Calculation parameter from Equation (B.12).

Return type:

float

structuralcodes.codes.ec2_2004.eps_cd_0(cement_class: str, f_cm: float, RH: int) → float[source]

Calculates eps_cd_0.

EN 1992-1-1:2004, Eq. (B.11).

Parameters:

  • cement_class (str) – The cement class, defaults to ‘R’. Possible values: ‘R’, ‘N’, ‘S’.

  • f_cm (float) – The mean concrete strength.

  • RH (int) – The relative humidity in percent.

Returns:

The nominal value for shrinkage.

Return type:

float

Raises:

ValueError – Checks if the cement class equals R, N or S.