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ci / test (push) Successful in 6m18s
History-free snapshot of the private development repository at cbe45c5 (2026-09-09). Code, docs and public catalogue only; no plant or job knowledge layers, no client or job names (tools/scrub.py clean). The intro deck is left out of this snapshot because its slide images could not be checked for job drawings.
62 lines
2.6 KiB
Python
62 lines
2.6 KiB
Python
# -*- coding: utf-8 -*-
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"""An opening that all but reaches an edge must not leave a fibre behind.
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A real piece had an opening drawn to 11.1041 ft on a panel 11.1042 ft wide.
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The 0.001 in of concrete left over was, arithmetically, the outermost material
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in the section -- so every in-plane stress was reported at a fibre 110 in from
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the centroid instead of 23 in, on a sliver nothing could be cast into. The
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piece came back at 432 psi where a commercial check of the same piece said
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162, and it was one of only two failures in a 194-piece sweep.
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The stress at a fibre that is not really there is a stress nobody has.
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"""
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import pytest
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from panellift import section
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from panellift.model import Blockout
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from conftest import make_panel
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def _panel_with_opening(gap_ft):
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"""A panel whose only opening stops `gap_ft` short of the far edge."""
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panel = make_panel()
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panel.blockouts = [Blockout(
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name='O1', x0=10.0, y0=3.0, length=4.0,
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width=panel.width_ft - 3.0 - gap_ft)]
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return panel
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@pytest.mark.parametrize('gap_ft', [0.0, 1e-4, 1e-3, 0.004])
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def test_a_drafting_sliver_is_not_the_extreme_fibre(gap_ft):
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"""Whether the opening lands exactly on the edge or a thousandth short,
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the section has to be the same piece of concrete."""
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exact = section.NetSection(_panel_with_opening(0.0), 12.0)
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nearly = section.NetSection(_panel_with_opening(gap_ft), 12.0)
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assert nearly.width_in == pytest.approx(exact.width_in, abs=0.1)
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assert nearly.y_extremes_in[1] == pytest.approx(exact.y_extremes_in[1],
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abs=0.1)
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assert nearly.iy_in4 == pytest.approx(exact.iy_in4, rel=0.01)
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def test_the_extreme_fibre_is_inside_the_concrete():
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"""The outermost fibre cannot be further from the centroid than the
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material is. This is what the sliver broke: 110 in of lever arm on a
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section only 46 in wide."""
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net = section.NetSection(_panel_with_opening(1e-3), 12.0)
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reach = max(abs(v) for v in net.y_extremes_in)
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assert reach <= net.width_in, (
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'extreme fibre %.1f in from the centroid, but the section is only '
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'%.1f in wide' % (reach, net.width_in))
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def test_an_opening_well_short_of_the_edge_keeps_its_strip():
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"""The snap is a noise floor, not a licence to delete real concrete. A
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strip an inch and a half wide is still a strip."""
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panel = _panel_with_opening(0.125) # 1.5 in of concrete left
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net = section.NetSection(panel, 12.0)
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strips = section.strips_at(panel, 12.0)
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assert len(strips) == 2
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assert net.y_extremes_in[1] > 0.5 * panel.width_ft * 12.0
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