Eurocode 3 module: `ec3`

Overview

The ec3 module provides tools for the design of steel structures according to EN 1993-1-1. It covers material properties, standard steel profiles, bolted and welded connections, and ULS member checks.

Materials

`Steel`

from eurocodepy.ec3 import Steel

steel = Steel('S355')
steel.fy   # yield strength [MPa]
steel.fu   # ultimate tensile strength [MPa]
steel.E    # elastic modulus [MPa]
steel.G    # shear modulus [MPa]
steel.nu   # Poisson's ratio

Available grades (enum SteelEnum): S235, S275, S355, S450.

`Weld`

from eurocodepy.ec3 import Weld, WeldTypeEnum

weld = Weld(grade='S355', weld_type=WeldTypeEnum.fillet)

Bolts

from eurocodepy.ec3 import Bolt, BoltGrade, BoltGrades, BoltsEnum

bolt = Bolt(diameter=20, grade=BoltGrade('8.8'))
bolt.fub    # ultimate tensile strength [MPa]
bolt.fyb    # yield strength [MPa]

Available bolt grades (enum BoltsEnum): 4.6, 5.6, 6.8, 8.8, 10.9.

Steel profiles

All profile classes expose standard geometric properties (A, Iy, Iz, Wely, Welz, Wply, Wplz, iy, iz, It, Iw, …).

I-profiles — `ProfileI`

from eurocodepy.ec3 import ProfileI, ProfilesIEnum

section = ProfileI('IPE300')
section.A    # cross-sectional area [mm²]
section.Iy   # second moment of area about y-axis [mm⁴]
section.h    # total height [mm]
section.bf   # flange width [mm]
section.tf   # flange thickness [mm]
section.tw   # web thickness [mm]

Available profiles (enum ProfilesIEnum): IPE80 to IPE600; HEA100 to HEA1000; HEB100 to HEB1000; HEM100 to HEM1000.

Hollow sections

from eurocodepy.ec3 import ProfileCHS, ProfileRHS, ProfileSHS

chs = ProfileCHS('CHS114.3x6')    # circular hollow section
rhs = ProfileRHS('RHS200x100x8')  # rectangular hollow section
shs = ProfileSHS('SHS150x150x8')  # square hollow section

Enums: ProfilesCHSEnum, ProfilesRHSEnum, ProfilesSHSEnum.

`SteelSection` and `SteelPlate`

from eurocodepy.ec3 import SteelSection, SteelPlate

# Generic section combining a profile and a steel grade
sec = SteelSection(profile=ProfileI('IPE300'), steel=Steel('S355'))

# Flat plate
plate = SteelPlate(b=200, t=12, steel=Steel('S275'))

Connections

Bolted connections

from eurocodepy.ec3 import BoltedConnection, PinnedConnection, PinnedConnectionDouble

conn = BoltedConnection(bolt=bolt, n_bolts=4, t=10.0, steel=steel)

Welded connections

from eurocodepy.ec3 import WeldConnection, WeldTypeEnum

weld_conn = WeldConnection(
    weld=weld,
    length=200.0,  # weld length [mm]
    throat=8.0,    # throat thickness [mm]
)

ULS checks — `ec3.uls`

The ec3.uls sub-module exposes cross-section and member-level resistance checks. Import directly from eurocodepy.ec3.uls.

Compliance

Calculations follow EN 1993-1-1:2005 and EN 1993-1-8 (connections).

Eurocode 3 module: ec3