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sub_formula_3_28_29_30

codes.eurocode.en_1992_1_1_2004.chapter_3_materials.sub_formula_3_28_29_30

Sub-formula 3.28, 3.29 and 3.30 from EN 1992-1-1:2004: Chapter 3 - Materials.

Classes:

codes.eurocode.en_1992_1_1_2004.chapter_3_materials.sub_formula_3_28_29_30.SubForm3Dot28And29And30Mu 

SubForm3Dot28And29And30Mu(sigma_pi: MPA, f_pk: MPA)

Bases: Formula

Class representing sub-formula for 3.28, 3.29 and 3.30 for the calculation of μ.

[\(\mu\)] Ratio between initial pre-stress and characteristic tensile strength [\(\sigma_{pi} / f_{pk}\)] [\(-\)].

EN 1992-1-1:2004 art.3.3.2(7) - [\(\mu\)]

Parameters:

  • sigma_pi (MPA) –

    [\(\sigma_{pi}\)] Initial pre-stress [\(MPa\)]

  • f_pk (MPA) –

    [\(f_{pk}\)] Characteristic tensile strength of pre-stress steel [\(MPa\)]

Returns:

  • None –
Source code in blueprints/codes/eurocode/en_1992_1_1_2004/chapter_3_materials/sub_formula_3_28_29_30.py 
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def __init__(
    self,
    sigma_pi: MPA,
    f_pk: MPA,
) -> None:
    r"""[$\mu$] Ratio between initial pre-stress and characteristic tensile strength  [$\sigma_{pi} / f_{pk}$] [$-$].

    EN 1992-1-1:2004 art.3.3.2(7) - [$\mu$]

    Parameters
    ----------
    sigma_pi : MPA
        [$\sigma_{pi}$] Initial pre-stress [$MPa$]
    f_pk : MPA
        [$f_{pk}$] Characteristic tensile strength of pre-stress steel [$MPa$]

    Returns
    -------
    None
    """
    super().__init__()
    self.sigma_pi = sigma_pi
    self.f_pk = f_pk

codes.eurocode.en_1992_1_1_2004.chapter_3_materials.sub_formula_3_28_29_30.SubForm3Dot28And29And30Mu.latex 

latex(n: int = 3) -> LatexFormula

Returns LatexFormula object for [\(\mu\)] in formula 3.28 and 3.29 and 3.30.

Source code in blueprints/codes/eurocode/en_1992_1_1_2004/chapter_3_materials/sub_formula_3_28_29_30.py 
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def latex(self, n: int = 3) -> LatexFormula:
    r"""Returns LatexFormula object for [$\mu$] in formula 3.28 and 3.29 and 3.30."""
    return LatexFormula(
        return_symbol=r"\mu",
        result=f"{self:.{n}f}",
        equation=r"\sigma_{pi} / f_{pk}",
        numeric_equation=rf"{self.sigma_pi:.{n}f} / {self.f_pk:.{n}f}",
        comparison_operator_label="=",
    )