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Calculate steel cross-section plastic modulus

EN560.320 Structural Design 1

Department of Civil and Systems Engineering

Johns Hopkins University

September 23, 2020

Calculate a steel W-shape cross-section plastic modulus with Python.

import sys; sys.version.split()[0]
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'3.7.7'

Use the very cool Python package sectionproperties. Install it here.

pip install sectionproperties
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import sectionproperties.pre.sections as sections
from sectionproperties.analysis.cross_section import CrossSection
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Units are in mm here.

geometry = sections.ISection(d=203, b=133, t_f=7.8, t_w=5.8, r=8.9, n_r=16)
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geometry.plot_geometry()
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mesh = geometry.create_mesh(mesh_sizes=[3.0])
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section = CrossSection(geometry, mesh)  # create a CrossSection object
section.plot_mesh()
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# perform a geometric, warping and plastic analysis, displaying the time info
section.calculate_geometric_properties()
section.calculate_warping_properties()
section.calculate_plastic_properties()
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print("Z = {:.0f} mm^3, plastic modulus about strong x-x axis".format(section.section_props.sxx))
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