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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.
121 lines
3.6 KiB
Python
121 lines
3.6 KiB
Python
# -*- coding: utf-8 -*-
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"""Shared fixtures, built from the ASPIRE Winter 2019 worked examples.
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Brown, K. "Calculations for Handling and Shipping Precast Concrete Deck
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Panels." ASPIRE, Winter 2019, pp. 24-27. The article reproduces PCI Design
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Handbook Table 8.3.1 and Figure 8.3.2 and works two examples end to end, which
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makes it the one published check available without a PCI licence.
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Panel: 10 ft x 32 ft x 8.75 in., normalweight, f'ci = 4000, f'c = 5000,
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four-point pick at the Figure 8.3.2 locations.
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"""
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import sys
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from pathlib import Path
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import pytest
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sys.path.insert(0, str(Path(__file__).resolve().parents[1] / 'src'))
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from panellift.model import Blockout, Lifter, Panel, Rigging, Stage # noqa: E402
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from panellift import pci # noqa: E402
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WIDTH_FT = 10.0
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LENGTH_FT = 32.0
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THICKNESS_IN = 8.75
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# The article's rounded values, quoted so a failure names the source number.
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ASPIRE = {
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'w_psf': 109.4,
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'moment_lbft': 23973.0,
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's_solid_in3': 1531.0,
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's_pocketed_in3': 1148.0,
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'strip_stress_psi': 244.0,
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'strip_allowable_psi': 316.0,
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'ship_stress_psi': 282.0,
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'ship_allowable_psi': 354.0,
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'pocketed_strip_stress_psi': 326.0,
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'pocketed_ship_stress_psi': 376.0,
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}
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def four_point_lifters(length_ft=LENGTH_FT, width_ft=WIDTH_FT):
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"""Two lines of two, at the Figure 8.3.2 equalising positions."""
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left, right = pci.optimal_two_line_supports(length_ft)
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ys = (0.25 * width_ft, 0.75 * width_ft)
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return [Lifter(mark='L{0}'.format(i + 1), family='TEST_LIFTER',
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x=x, y=y, role='strip', capacity_lb=8000.0)
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for i, (x, y) in enumerate([(left, ys[0]), (left, ys[1]),
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(right, ys[0]), (right, ys[1])])]
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def make_panel(mark='ASPIRE-1', blockouts=None):
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"""A fresh panel every time.
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Built by a plain function rather than by one fixture mutating another:
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pytest caches a fixture per test, so a test asking for both the solid and
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the pocketed panel would otherwise be handed the same object twice and
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quietly compare it with itself.
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"""
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return Panel(
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mark=mark,
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length_ft=LENGTH_FT,
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width_ft=WIDTH_FT,
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thickness_in=THICKNESS_IN,
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unit_weight_pcf=150.0,
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fci_psi=4000.0,
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fc_psi=5000.0,
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finish='smooth',
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product_type='flat',
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lifters=four_point_lifters(),
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blockouts=list(blockouts or []),
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)
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def aspire_pockets():
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"""Five 6 in. x 24 in. full-depth pockets in one row across the width.
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The article puts them 'at or near the lifting points' and notes that is
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not good practice -- it is the location of maximum moment. Five pockets
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six inches wide take 2.5 ft out of a 10 ft width, giving S = 1148 in^3.
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"""
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left, _ = pci.optimal_two_line_supports(LENGTH_FT)
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return [Blockout(name='P{0}'.format(i + 1),
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x0=left - 1.0, y0=1.0 + i * 1.5,
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length=2.0, width=0.5)
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for i in range(5)]
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@pytest.fixture
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def solid_panel():
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return make_panel()
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@pytest.fixture
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def pocketed_panel():
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return make_panel(mark='ASPIRE-2', blockouts=aspire_pockets())
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@pytest.fixture
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def stripping():
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return Stage(name='stripping',
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multiplier=pci.stripping_multiplier('flat', 'smooth'),
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fc_psi=4000.0)
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@pytest.fixture
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def shipping():
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return Stage(name='transportation',
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multiplier=pci.TRANSPORTATION_MULTIPLIER,
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fc_psi=5000.0)
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@pytest.fixture
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def rolling():
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return Rigging(mode='rolling', sling_angle_deg=90.0)
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@pytest.fixture
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def static_lift():
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return Rigging(mode='static', sling_angle_deg=90.0)
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