Sectioned Roof#
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In this example we will demonstrate:
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from math import inf
from dlubal.api import rfem
# Basic Settings
n_u = 4
n_b = 7
L = 35
H_1 = 7
H_2 = 1
d = 2
s = 8
section_beam = 1
section_verticals = 2
section_3 = 2
thickness_material = 2
thickness_roof = 1
roof_thick = 0.2
nodal_supports = 1
assert n_b % 2 == 1, "n_b should be odd"
# Connect to the RFEM application
with rfem.Application() as rfem_app:
# Close all models opened in application without saving
rfem_app.close_all_models(save_changes=False)
# Create new model named 'sectioned_roof'
rfem_app.create_model(name='sectioned_roof')
# Cleanup the model
rfem_app.delete_all_objects()
material_section_thickness = [
rfem.structure_core.Material(
no=1,
name='S235 | CYS EN 1993-1-1:2009-03'),
rfem.structure_core.Material(
no=2,
name='C12/15'),
rfem.structure_core.Section(
no=1,
name='IPE 200 | -- | British Steel',
material=1),
rfem.structure_core.Section(
no=2,
name='SHS 100x100x10.0',
material=1),
rfem.structure_core.Thickness(
no=thickness_roof,
user_defined_name_enabled=True,
name='Roof',
uniform_thickness=roof_thick,
material=thickness_material)
]
rfem_app.create_object_list(material_section_thickness)
node_count = 1
for j in range(n_u + 1):
nodes_list = []
for i in range(2 * n_b + 1):
x = i * L / (2 * n_b)
nodes_list.append(
rfem.structure_core.Node(
no=node_count,
coordinate_1=x,
coordinate_2=j * s,
coordinate_3=-H_1 * (1 - (x - (L / 2)) ** 2 / (L / 2) ** 2)))
node_count += 1
rfem_app.create_object_list(nodes_list)
nodes_list = []
for i in range((n_b - 1) // 2):
nodes_list.append(
rfem.structure_core.Node(
no=node_count,
coordinate_1=0 + i * L / n_b,
coordinate_2=j * s,
coordinate_3=rfem_app.get_object(
rfem.structure_core.Node(
no=3 + 2 * i)).coordinate_3))
node_count += 1
nodes_list.append(
rfem.structure_core.Node(
no=node_count,
coordinate_1=L / (2 * n_b) + i * L / n_b,
coordinate_2=j * s,
coordinate_3=rfem_app.get_object(
rfem.structure_core.Node(
no=3 + 2 * i)).coordinate_3))
node_count += 1
nodes_list.append(
rfem.structure_core.Node(
no=node_count,
coordinate_1=L / 2 - L / (2 * n_b),
coordinate_2=j * s,
coordinate_3=-H_1 - H_2))
node_count += 1
nodes_list.append(
rfem.structure_core.Node(
no=node_count,
coordinate_1=L / 2,
coordinate_2=j * s,
coordinate_3=-H_1 - H_2))
node_count += 1
nodes_list.append(
rfem.structure_core.Node(
no=node_count,
coordinate_1=L / 2 + L / (2 * n_b),
coordinate_2=j * s,
coordinate_3=-H_1 - H_2))
node_count += 1
rfem_app.create_object_list(nodes_list)
nodes_list = []
for i in range((n_b - 1) // 2):
nodes_list.append(
rfem.structure_core.Node(
no=node_count,
coordinate_1=L / 2 + L / n_b + i * L / n_b,
coordinate_2=j * s,
coordinate_3=rfem_app.get_object(
rfem.structure_core.Node(
no=n_b + 2 + 2 * i)).coordinate_3))
node_count += 1
nodes_list.append(
rfem.structure_core.Node(
no=node_count,
coordinate_1=L / 2 + 1.5 * L / n_b + i * L / n_b,
coordinate_2=j * s,
coordinate_3=rfem_app.get_object(
rfem.structure_core.Node(
no=n_b + 2 + 2 * i)).coordinate_3))
node_count += 1
rfem_app.create_object_list(nodes_list)
srf_node_ref = node_count
for j in range(2):
nodes_list = []
for i in range((n_b - 1) // 2):
nodes_list.append(
rfem.structure_core.Node(
no=node_count,
coordinate_1=0 + i * L / n_b,
coordinate_2=-d + j * (n_u * s + 2 * d),
coordinate_3=rfem_app.get_object(
rfem.structure_core.Node(
no=3 + 2 * i)).coordinate_3))
node_count += 1
nodes_list.append(
rfem.structure_core.Node(
no=node_count,
coordinate_1=L / n_b + i * L / n_b,
coordinate_2=-d + j * (n_u * s + 2 * d),
coordinate_3=rfem_app.get_object(
rfem.structure_core.Node(
no=3 + 2 * i)).coordinate_3))
node_count += 1
nodes_list.append(
rfem.structure_core.Node(
no=node_count,
coordinate_1=L / 2 - L / (2 * n_b),
coordinate_2=-d + j * (n_u * s + 2 * d),
coordinate_3=-H_1 - H_2))
node_count += 1
nodes_list.append(
rfem.structure_core.Node(
no=node_count,
coordinate_1=L / 2 + L / (2 * n_b),
coordinate_2=-d + j * (n_u * s + 2 * d),
coordinate_3=-H_1 - H_2))
node_count += 1
rfem_app.create_object_list(nodes_list)
nodes_list = []
for i in range((n_b - 1) // 2):
nodes_list.append(
rfem.structure_core.Node(
no=node_count,
coordinate_1=L / 2 + L / (2 * n_b) + i * L / n_b,
coordinate_2=-d + j * (n_u * s + 2 * d),
coordinate_3=rfem_app.get_object(
rfem.structure_core.Node(
no=n_b + 2 + 2 * i)).coordinate_3))
node_count += 1
nodes_list.append(
rfem.structure_core.Node(
no=node_count,
coordinate_1=L / 2 + 1.5 * L / n_b + i * L / n_b,
coordinate_2=-d + j * (n_u * s + 2 * d),
coordinate_3=rfem_app.get_object(
rfem.structure_core.Node(
no=n_b + 2 + 2 * i)).coordinate_3))
node_count += 1
rfem_app.create_object_list(nodes_list)
mem_num = 1
members_list = []
lines_list = []
for j in range(n_u + 1):
for i in range(n_b):
members_list.append(
rfem.structure_core.Member(
no=mem_num,
node_start=2 * i + 1 + j * (4 * n_b + 2),
node_end=2 * i + 3 + j * (4 * n_b + 2),
type=rfem.structure_core.Member.TYPE_BEAM,
section_start=section_beam))
nodes = rfem_app.get_object(
rfem.structure_core.Node(
no=2 * i + 2 + j * (4 * n_b + 2)))
lines_list.append(
rfem.structure_core.Line(
no=mem_num,
type=rfem.structure_core.Line.TYPE_PARABOLA,
parabola_first_node=2 * i + 1 + j * (4 * n_b + 2),
parabola_second_node=2 * i + 3 + j * (4 * n_b + 2),
parabola_control_point={
'x': nodes.coordinate_1,
'y': nodes.coordinate_2,
'z': nodes.coordinate_3
}
)
)
mem_num += 1
for i in range((n_b - 1) // 2):
members_list.append(
rfem.structure_core.Member(
no=mem_num,
node_start=2 * i + 1 + j * (4 * n_b + 2),
node_end=2 * n_b + 2 + 2 * i + j * (4 * n_b + 2),
type=rfem.structure_core.Member.TYPE_BEAM,
section_start=section_verticals))
mem_num += 1
members_list.append(
rfem.structure_core.Member(
no=mem_num,
node_start=2 * i + 2 + j * (4 * n_b + 2),
node_end=2 * n_b + 3 + 2 * i + j * (4 * n_b + 2),
type=rfem.structure_core.Member.TYPE_BEAM,
section_start=section_verticals))
mem_num += 1
for i in range(3):
members_list.append(
rfem.structure_core.Member(
no=mem_num,
node_start=n_b + i + j * (4 * n_b + 2),
node_end=2 * n_b + n_b + i + 1 + j * (4 * n_b + 2),
type=rfem.structure_core.Member.TYPE_BEAM,
section_start=section_verticals))
mem_num += 1
for i in range((n_b - 1) // 2):
members_list.append(
rfem.structure_core.Member(
no=mem_num,
node_start=n_b + 3 + 2 * i + j * (4 * n_b + 2),
node_end=3 * n_b + 4 + 2 * i + j * (4 * n_b + 2),
type=rfem.structure_core.Member.TYPE_BEAM,
section_start=section_verticals))
mem_num += 1
members_list.append(
rfem.structure_core.Member(
no=mem_num,
node_start=n_b + 3 + 2 * i + 1 + j * (4 * n_b + 2),
node_end=3 * n_b + 5 + 2 * i + j * (4 * n_b + 2),
type=rfem.structure_core.Member.TYPE_BEAM,
section_start=section_verticals))
mem_num += 1
for i in range(n_b - 1):
members_list.append(
rfem.structure_core.Member(
no=mem_num,
node_start=srf_node_ref + 2 * i + 1,
node_end=srf_node_ref + 2 * i + 2,
type=rfem.structure_core.Member.TYPE_BEAM,
section_start=section_3))
mem_num += 1
members_list.append(
rfem.structure_core.Member(
no=mem_num,
node_start=srf_node_ref + 2 * i + 2 * n_b + 1,
node_end=srf_node_ref + 2 * i + 2 * n_b + 2,
type=rfem.structure_core.Member.TYPE_BEAM,
section_start=section_3))
mem_num += 1
rfem_app.create_object_list(members_list)
rfem_app.update_object_list(lines_list)
srf_line_ref = mem_num
lines_list = []
for i in range(n_b):
lines_list.append(
rfem.structure_core.Line(
no=mem_num,
definition_nodes=[
srf_node_ref + 2 * i,
srf_node_ref + 2 * i + 1]))
mem_num += 1
lines_list.append(
rfem.structure_core.Line(
no=mem_num,
definition_nodes=[
srf_node_ref + 2 * i + 2 * n_b,
srf_node_ref + 2 * i + 1 + 2 * n_b]))
mem_num += 1
for i in range(2 * n_b):
lines_list.append(
rfem.structure_core.Line(
no=mem_num,
definition_nodes=[
srf_node_ref + i,
srf_node_ref + i + 2 * n_b]))
mem_num += 1
surfaces_list = []
for i in range(1, n_b + 1):
surfaces_list.append(
rfem.structure_core.Surface(
no=i,
boundary_lines=[
srf_line_ref + 2 * (i - 1),
srf_line_ref + 2 * n_b + 1 + 2 * (i - 1),
srf_line_ref + 2 * (i - 1) + 1,
srf_line_ref + 2 * n_b + 2 * (i - 1)],
type=rfem.structure_core.Surface.TYPE_STANDARD,
geometry=rfem.structure_core.Surface.GEOMETRY_PLANE,
thickness=thickness_roof))
nodal_supports_list = []
support_nodes = []
for i in range(n_u + 1):
support_nodes.append(i * (4 * n_b + 2) + 1)
support_nodes.append(2 * n_b + i * (4 * n_b + 2) + 1)
nodal_supports_list = [
rfem.types_for_nodes.NodalSupport(
no=1,
nodes=[support_nodes[0],],
spring_x=inf,
spring_y=inf,
spring_z=inf,
rotational_restraint_x=0,
rotational_restraint_y=0,
rotational_restraint_z=inf),
rfem.types_for_nodes.NodalSupport(
no=2,
nodes=support_nodes[1:],
spring_x=0,
spring_y=0,
spring_z=inf,
rotational_restraint_x=0,
rotational_restraint_y=0,
rotational_restraint_z=inf)]
rfem_app.create_object_list(lines_list)
rfem_app.create_object_list(surfaces_list)
rfem_app.create_object_list(nodal_supports_list)
# Static Analysis Settings
rfem_app.create_object(
rfem.loading.StaticAnalysisSettings(no=1)
)
# Load Cases
rfem_app.create_object(
rfem.loading.LoadCase(
no=1,
name="Self weight",
static_analysis_settings=1,
)
)