def test_rectangular_offset():
# exterior negative offset
rect = sections.rectangular_section(d=500, b=300)
rect = rect.offset_perimeter(amount=-10, where="exterior")
rect.create_mesh([200])
section = Section(rect)
section.calculate_geometric_properties()
area = 480 * 280
check.almost_equal(section.get_area(), area, rel=r_tol)
# exterior positive offset
rect = sections.rectangular_section(d=500, b=300)
rect = rect.offset_perimeter(amount=10, where="exterior")
rect.create_mesh([200])
section = Section(rect)
section.calculate_geometric_properties()
area = 520 * 320 - (20 * 20 - np.pi * 10 * 10)
check.almost_equal(section.get_area(), area, rel=r_tol)
def test_compound_rectangular_isection_offset_corrode():
d = 300
b = 150
tf = 10
tw = 8
r = 12
b_p = 250
t_p = 16
ub = steel_sections.i_section(d=d, b=b, t_f=tf, t_w=tw, r=r, n_r=16)
plate = (sections.rectangular_section(
b=b_p, d=t_p).align_center(ub).align_to(ub, on="top"))
geom_test = ub + plate
geom_test = geom_test.offset_perimeter(amount=-2, where="exterior")
geom_test.create_mesh([100])
section_test = Section(geom_test)
section_test.calculate_geometric_properties()
ub_corroded = steel_sections.mono_i_section(d=298,
b_t=146,
b_b=146,
t_ft=8,
t_fb=6,
t_w=4,
r=14,
n_r=16)
plate_corroded1 = (sections.rectangular_section(
b=146, d=2).align_center(ub_corroded).align_to(ub_corroded, "top"))
plate_corroded2 = (sections.rectangular_section(
b=246,
d=12).align_center(ub_corroded).align_to(plate_corroded1, "top"))
rad_l = (draw_radius(2,
8).align_to(plate_corroded1,
"left").align_to(plate_corroded2,
"bottom"))
rad_r = (draw_radius(2, 8).mirror_section("y", [2, 0]).align_to(
plate_corroded1, "right").align_to(plate_corroded2, "bottom"))
geom_corroded = ub_corroded + plate_corroded1 + plate_corroded2 + rad_l + rad_r
geom_corroded.create_mesh([100])
section_corroded = Section(geom_corroded)
section_corroded.calculate_geometric_properties()
check.almost_equal(section_test.get_area(),
section_corroded.get_area(),
rel=r_tol)
def test_compound_rectangular_offset():
rect1 = sections.rectangular_section(d=50, b=50)
rect2 = sections.rectangular_section(d=50, b=50).align_to(rect1, "right")
geom = rect1 + rect2
geom = geom.offset_perimeter(amount=-5, where="exterior")
geom.create_mesh([50])
section = Section(geom)
section.calculate_geometric_properties()
area = 90 * 40
check.almost_equal(section.get_area(), area, rel=r_tol)
def test_box_offset():
# exterior negative offset
box = steel_sections.rectangular_hollow_section(d=200,
b=100,
t=10,
r_out=0,
n_r=1)
box = box.offset_perimeter(amount=-5, where="exterior")
box.create_mesh([50])
section = Section(box)
section.calculate_geometric_properties()
area = 190 * 90 - 180 * 80
check.almost_equal(section.get_area(), area, rel=r_tol)
# exterior positve offset
box = steel_sections.rectangular_hollow_section(d=200,
b=100,
t=10,
r_out=0,
n_r=1)
box = box.offset_perimeter(amount=5, where="exterior")
box.create_mesh([50])
section = Section(box)
section.calculate_geometric_properties()
area = 210 * 110 - (10 * 10 - np.pi * 5 * 5) - 180 * 80
check.almost_equal(section.get_area(), area, rel=r_tol)
# interior negative offset
box = steel_sections.rectangular_hollow_section(d=200,
b=100,
t=10,
r_out=0,
n_r=1)
box = box.offset_perimeter(amount=-5, where="interior")
box.create_mesh([50])
section = Section(box)
section.calculate_geometric_properties()
area = 200 * 100 - 170 * 70
check.almost_equal(section.get_area(), area, rel=r_tol)
# interior positive offset
box = steel_sections.rectangular_hollow_section(d=200,
b=100,
t=10,
r_out=0,
n_r=1)
box = box.offset_perimeter(amount=5, where="interior")
box.create_mesh([50])
section = Section(box)
section.calculate_geometric_properties()
area = 200 * 100 - 190 * 90 + (10 * 10 - np.pi * 5 * 5)
check.almost_equal(section.get_area(), area, rel=r_tol)
# all negative offset
box = steel_sections.rectangular_hollow_section(d=200,
b=100,
t=10,
r_out=0,
n_r=1)
box = box.offset_perimeter(amount=-2.5, where="all")
box.create_mesh([50])
section = Section(box)
section.calculate_geometric_properties()
area = 195 * 95 - 185 * 85 + (5 * 5 - np.pi * 2.5 * 2.5)
check.almost_equal(section.get_area(), area, rel=r_tol)
# all positive offset
box = steel_sections.rectangular_hollow_section(d=200,
b=100,
t=10,
r_out=0,
n_r=1)
box = box.offset_perimeter(amount=5, where="all")
box.create_mesh([50])
section = Section(box)
section.calculate_geometric_properties()
area = 210 * 110 - (10 * 10 - np.pi * 5 * 5) - 170 * 70
check.almost_equal(section.get_area(), area, rel=r_tol)