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Eurocode 5 module: ec5

Overview

The ec5 module provides tools for the design of timber structures according to EN 1995-1-1. It covers material classes for all common timber products, modification factors, and ULS / SLS checks.

Materials

Timber (base class)

from eurocodepy.ec5 import Timber
t = Timber('C24')
t.fmk      # characteristic bending strength [MPa]
t.ft0k     # tension parallel to grain [MPa]
t.fc0k     # compression parallel to grain [MPa]
t.fvk      # shear strength [MPa]
t.E0mean   # mean modulus of elasticity parallel to grain [MPa]
t.E0_05    # 5th percentile modulus [MPa]
t.Gmean    # mean shear modulus [MPa]
t.rhok     # characteristic density [kg/m³]
t.rhomean  # mean density [kg/m³]

SolidTimber

For sawn structural timber (strength classes C and D).

from eurocodepy.ec5 import SolidTimber, Softwood, Hardwood

c24 = SolidTimber('C24')   # softwood C class
d30 = SolidTimber('D30')   # hardwood D class

Glulam

For glued laminated timber (GL classes).

from eurocodepy.ec5 import Glulam

gl28h = Glulam('GL28h')   # homogeneous
gl28c = Glulam('GL28c')   # combined

Other product classes

Class Product
CLT Cross-laminated timber
LVL Laminated veneer lumber
ST Structural timber (alias for SolidTimber)

ServiceClass (enum)

Member Description
SC1 Indoor, dry conditions (MC ≤ 12%)
SC2 Covered, outdoor (MC ≤ 20%)
SC3 Exposed to weather

LoadDuration (enum)

Permanent, LongTerm, MediumTerm (= Medium), ShortTerm, Instantaneous

k_mod — modification factor

kmod = timber.k_mod(
    service_class=ServiceClass.SC1,
    load_duration=LoadDuration.Medium,
)

GetTimberDesignValues

Convenience function that returns design strengths for a given timber grade, service class, and load duration in a single call.

ULS checks — ec5.uls

Bending — ec5.uls.bending

from eurocodepy.ec5.uls.bending import (
    calc_mrd,        # design bending resistance
    calc_lateral_torsional_buckling,
    check_biaxial_bending,
)

Shear — ec5.uls.shear

from eurocodepy.ec5.uls.shear import (
    calc_vrd,     # design shear resistance
    calc_torsion, # torsion capacity
)

SLS checks — ec5.sls

Vibration — ec5.sls.vibration

from eurocodepy.ec5.sls.vibration import floor_freq, vel, vlim, a_from_b, b_from_a

f1 = floor_freq(l=5.0, EI=1.2e10, m=300.0)   # fundamental frequency [Hz]
v  = vel(...)         # unit impulse velocity response [m/s per N]
vl = vlim(...)        # velocity limit [m/s per N]

Deformation — ec5.sls.deformation

from eurocodepy.ec5.sls import deformation

Compliance

Calculations follow EN 1995-1-1:2004+A2:2014.

Further reading