layer_output='mesh_welded')
# Tetrahedrons
mesh = rs.ObjectsByLayer('mesh_welded')[0]
rhino.add_tets_from_mesh(mdl, name='mesh_tets', mesh=mesh, volume=0.02)
#print(len(mdl.sets['mesh_tets'].selection))
# Analyse
zmin, zmax = mdl.node_bounds()[2]
nodes_top = [i for i, node in mdl.nodes.items() if node.z > zmax - 0.010]
nodes_bot = [i for i, node in mdl.nodes.items() if node.z < zmin + 0.010]
mdl.add_set(name='nset_top', type='node', selection=nodes_top)
mdl.add_set(name='nset_bot', type='node', selection=nodes_bot)
#print(mdl.sets['nset_top'])
#print(mdl.sets['nset_bot'])
mdl.add([
ElasticIsotropic(name='mat_elastic', E=50 * 10**9, v=0.3, p=1),
SolidSection(name='sec_solid'),
ElementProperties(name='ep_tets',
material='mat_elastic',
section='sec_solid',
elset='mesh_tets'),
PinnedDisplacement(name='disp_pinned', nodes='nset_bot'),
PointLoad(name='load_top', nodes='nset_top', y=20000, z=10000),
GeneralStep(name='step_bc', displacements='disp_pinned'),
filepath = os.path.join(compas_vibro.DATA, 'network_10x10.json')
network = Network.from_json(filepath)
mdl.add_nodes_elements_from_network(network=network,
element_type='BeamElement',
elset='elset_lines',
axes={'ex': [0, 0, 1]})
# Materials
mdl.add(ElasticIsotropic(name='mat_elastic', E=20 * 10**9, v=0.3, p=1500))
# Sets
mdl.add_set(name='load_pts', selection=[15, 14], type='node')
# Section
mdl.add(CircularSection(name='cirsec', r=.05))
mdl.add(
Properties(name='ep',
material='mat_elastic',
section='cirsec',
elset='elset_lines'))
# Displacements
boundary = network.leaves()
mdl.add(PinnedDisplacement(name='disp', nodes=boundary))
# Loads
# Add elements
mdl.add_elements(elements=[[0, 4], [1, 4], [2, 4], [3, 4]],
type='BeamElement',
axes={'ex': [1, 0, 0]})
mdl.add_element(nodes=[0, 1, 4], type='ShellElement')
# print('Element 3 nodes: ', mdl.elements[3].nodes)
# print('Element count: ', mdl.element_count())
# print('Element index: ', mdl.element_index)
# print('Check element with nodes 1-4: ', mdl.check_element_exists([1, 4]))
# print('Check element with nodes 0-1: ', mdl.check_element_exists([0, 1]))
# Add sets
mdl.add_set(name='nset_base', type='node', selection=[0, 1, 2, 3])
mdl.add_set(name='nset_top', type='node', selection=[4])
mdl.add_set(name='elset_beams', type='element', selection=[0, 1, 2, 3])
mdl.add_set(name='elset_shell', type='element', selection=[4])
# print('Set: nset_base: ', mdl.sets['nset_base'])
# print('Set: elset_shell: ', mdl.sets['elset_shell'])
# Add sections
mdl.add([
CircularSection(name='sec_circ', r=0.010),
ShellSection(name='sec_shell', t=0.005),
])
# print('Section geometry: ', mdl.sections['sec_circ'].geometry)
from compas_fea.structure import GeneralStep
from compas_rhino.helpers import mesh_from_guid
# Author(s): Tomás Méndez Echenagucia (github.com/tmsmendez)
# get mesh from rhino layer ----------------------------------------------------
mesh = mesh_from_guid(Mesh, rs.ObjectsByLayer('mesh')[0])
# add shell elements from mesh -------------------------------------------------
name = 'shell_example'
s = Structure(name=name, path=compas_fea.TEMP)
shell_keys = s.add_nodes_elements_from_mesh(mesh, element_type='ShellElement')
s.add_set('shell', 'element', shell_keys)
# add supports from rhino layer-------------------------------------------------
pts = rs.ObjectsByLayer('pts')
pts = [rs.PointCoordinates(pt) for pt in pts]
nkeys = []
for pt in pts:
nkeys.append(s.check_node_exists(pt))
s.add_set(name='support_nodes', type='NODE', selection=nkeys)
supppots = FixedDisplacement(name='supports', nodes='support_nodes')
s.add_displacement(supppots)
# add materials and sections -----------------------------------------------
E = 40 * 10**9
v = .02
def compute_compas_fea(file_path, load_path, fea_engine='abaqus', recompute=True):
""" Use abaqus (via compas_fea) to perform elastic FEA on the given frame
under a given load case. If no load path is specified, elemental gravity
will be assumbed to be applied.
Parameters
----------
file_path : string
full path to the frame shape's json file.
load_path : type
full path to the load case's json file.
Returns
-------
nD: dict
Reactional nodal displacement
key is the node id.
value is
(nodal_id, dx, dy, dz, theta_x, theta_y, theta_z).
fR: dict
Fixities reaction force, moment.
key is the nodal id.
value is [Fxyz, Mxyz] in the global axes.
eR: dict
Element-wise reaction force, moment (two ends).
key is the element id.
(Fxyz_1, Mxyz_1, Fxyz_2, Mxyz_2)
"""
root_dir = os.path.dirname(os.path.abspath(__file__))
temp_dir = os.path.join(root_dir, 'compas_fea-temp')
if not os.path.exists(temp_dir):
os.makedirs(temp_dir)
file_json_name = file_path.split(os.sep)[-1]
file_name = file_json_name.split('.')[0]
print('compas_fea initing: file name {}'.format(file_name))
if not recompute:
nD, fR, eR = parse_abaqus_result_json(file_name, temp_dir)
return nD, fR, eR
with open(file_path, 'r') as f:
json_data = json.loads(f.read())
load_json_data = {}
if load_path:
with open(load_path, 'r') as f:
load_json_data = json.loads(f.read())
# init an empty structure
mdl = Structure(name=file_name, path=os.path.join(temp_dir, ''))
# nodes
mdl.add_nodes(nodes=parse_frame_nodes(json_data))
# elements
elements = parse_elements(json_data)
# align local axes with conmech
sc = stiffness_checker(json_file_path=file_path, verbose=False)
e_rot_mats = sc.get_element_local2global_rot_matrices()
assert len(e_rot_mats) == len(elements)
for e, mat in zip(elements, e_rot_mats):
# compas_fea local axis convention is differrent to the one used in conmech:
# in compas_fea
# 'ex' axis represents the cross-section’s major axis
# 'ey' is the cross-section’s minor axis
# 'ez' is the axis along the element
# TODO: this numpy array to list conversion
# is essential to make compas_fea work...
ez = list(mat[0][0:3]) # conmech longitude axis
ex = list(mat[1][0:3]) # conmech cross sec major axis
ey = list(mat[2][0:3]) # conmech cross sec minor axis
mdl.add_element(nodes=e,
type='BeamElement',
axes={'ex': ex, 'ey': ey, 'ez': ez})
# print(mdl.elements[mdl.check_element_exists(nodes=e)])
assert_equal(mdl.element_count(), len(elements))
# Sets
# just convenient aliases for referring to a group of elements
mdl.add_set(name='elset_all', type='element', selection=list(range(mdl.element_count())))
mdl.add_set(name='nset_all', type='node', selection=list(range(mdl.node_count())))
fixities = parse_fixties(json_data)
mdl.add_set(name='nset_fix', type='node', selection=[f[0] for f in fixities])
if load_json_data:
pt_loads, include_sw = parse_load_case(load_json_data)
# mdl.add_set(name='nset_pt_load', type='node', selection=[l[0] for l in pt_loads])
else:
pt_loads = []
include_sw = True
if pt_loads:
mdl.add_set(name='nset_v_load_all', type='node', selection=[pl[0] for pl in pt_loads])
# Materials
# Young’s modulus E [in units of Pa]
# Poisson’s ratio v and density p [kg per cubic metre].
mat_json = json_data['material_properties']
mat_name = 'mat_' + mat_json['material_name']
E_scale = parse_pressure_scale_conversion(mat_json['youngs_modulus_unit'])
p_scale = parse_density_scale_conversion(mat_json['density_unit'])
mdl.add(ElasticIsotropic(name=mat_name,
E=E_scale * mat_json['youngs_modulus'],
v=mat_json['poisson_ratio'],
p=p_scale * mat_json['density']))
# G_scale = parse_pressure_scale_conversion(mat_json['shear_modulus_unit'])
# print('{}, {}'.format(mdl.materials['mat_' + mat_json['material_name']].G, G_scale * mat_json['shear_modulus']))
# assert_almost_equal(mdl.materials['mat_' + mat_json['material_name']].G['G'], G_scale * mat_json['shear_modulus'])
# print('-----------material')
# print(mdl.materials[mat_name])
# Sections
# SI units should be used, this includes the use of metres m for cross-section dimensions, not millimetres mm.
sec_name = 'sec_circ'
mdl.add(CircularSection(name=sec_name, r=parse_circular_cross_sec_radius(json_data)))
# print('-----------cross section')
# print(mdl.sections[sec_name])
# Properties, associate material & cross sec w/ element sets
mdl.add(Properties(name='ep_all', material=mat_name, section=sec_name, elset='elset_all'))
# Displacements
# pin supports
for i, fix in enumerate(fixities):
f_dof = []
for j in range(6):
if fix[j+1] == 1:
f_dof.append(0)
else:
f_dof.append(None)
mdl.add(GeneralDisplacement(name='disp_fix_'+str(i), nodes=[fix[0]], x=f_dof[0], y=f_dof[1], z=f_dof[2], xx=f_dof[3], yy=f_dof[4], zz=f_dof[5]))
# print('-----------fixities')
# for i in range(len(fixities)):
# print(mdl.displacements['disp_fix_'+str(i)])
# Loads
if pt_loads:
mdl.add([PointLoad(name='load_v_'+str(i), nodes=[pl[0]],
x=pl[1], y=pl[2], z=pl[3],
xx=pl[4], yy=pl[5], zz=pl[6])
for i, pl in enumerate(pt_loads)])
if include_sw:
mdl.add(GravityLoad(name='load_gravity', elements='elset_all'))
else:
mdl.add(GravityLoad(name='load_gravity', elements='elset_all'))
# print('-----------loads')
# print(mdl.loads['load_gravity'])
# for i in range(len(pt_loads)):
# print(mdl.loads['load_v_'+str(i)])
# Steps
loads_names = []
if pt_loads:
loads_names.extend(['load_v_'+str(i) for i in range(len(pt_loads))])
if include_sw:
loads_names.append('load_gravity')
mdl.add([
GeneralStep(name='step_bc', displacements=['disp_fix_'+str(i) for i in range(len(fixities))]),
GeneralStep(name='step_loads', loads=loads_names)
])
# a boundary condition step such as 'step_bc' above, should always be applied as the first step to prevent rigid body motion
mdl.steps_order = ['step_bc', 'step_loads']
# Summary
mdl.summary()
# Run
# node
# 'u': nodal displacement: ux, uy, uz, um (magnitude)
# 'ur': nodal rotation
# 'rf': reaction force
# 'cf': concentrated force (external load)
# 'cm': concentrated moment (external load)
# element
# 's': beam stress (conmech cannot compute this at
# version 0.1.1)
# For beam, the following values are evaluated
# at the "integration point" 'ip1' (middle point)
# and pts along the axis: 'sp3, sp7, sp11, sp15'
# sxx: axial
# syy: hoop
# sxy: torsion
# smises: Von Mises
# smaxp: max principal
# sminp: min principal
# 'sf': beam section force
# sf1: axial
# sf2: shear x
# sf3: shear y
if fea_engine == 'abaqus':
mdl.analyse_and_extract(software='abaqus', fields=['u', 'ur', 'rf', 'rm', 'sf'], ndof=6, output=True)
nD, fR, eR = parse_abaqus_result_json(file_name, temp_dir)
elif fea_engine == 'opensees':
mdl.analyse_and_extract(software='opensees', fields=['u'], exe=OPENSEES_PATH, ndof=6, output=True, save=True)
raise NotImplementedError('opensees from compas_fea is not fully supported at this moment...')
nD = {}
fR = {}
eR = {}
# nD = mdl.get_nodal_results(step='step_load', field='ux', nodes='nset_all')
print(mdl.results)
else:
raise NotImplementedError('FEA engine not supported!')
return nD, fR, eR
mdl = Structure(name='shell_bench', path=compas_fea.TEMP)
# Nodes and Elements
xyz = [[0, 0, 0], [1, 0, 0], [2, 0, 0], [0, 1, 0], [1, 1, 0], [2, 1, 0],
[0, 2, 0], [1, 2, 0], [2, 2, 0]]
nodes = mdl.add_nodes(xyz)
shells = [[0, 1, 4, 3], [1, 2, 5, 4], [3, 4, 7, 6], [4, 5, 8, 7]]
shells = [mdl.add_element(shell, 'ShellElement') for shell in shells]
# Sets
elset_shells = mdl.add_set('elset_shells', 'element', shells)
# Materials
mdl.add(Steel(name='mat_steel'))
# Sections
mdl.add(ShellSection(name='sec_shell', t=0.01))
# Properties
mdl.add(
Properties(name='ep_shell',
material='mat_steel',
section='sec_shell',
mdl = Structure(name='mesh_floor', path='C:/Temp/')
# Elements
blender.add_nodes_elements_from_layers(mdl,
layers='elset_floor',
mesh_type='ShellElement')
blender.add_nodes_elements_from_layers(mdl,
layers='elset_ties',
line_type='TrussElement')
# Sets
blender.add_nsets_from_layers(mdl, layers=['nset_corner1', 'nset_corner2'])
edges = [i for i in mdl.nodes if mdl.nodes[i].z < 0.001]
mdl.add_set(name='nset_edges', type='node', selection=edges)
# Materials
mdl.add([
Concrete(name='mat_concrete', fck=90, fr=[1.16, 0.15]),
Steel(name='mat_steel', fy=355),
])
# Sections
mdl.add([
ShellSection(name='sec_floor', t=0.050),
TrussSection(name='sec_ties', A=pi * 0.25 * 0.030**2),
])
# Author(s): Tomás Méndez Echenagucia (github.com/tmsmendez)
# get mesh from json file ------------------------------------------------------
filepath = compas_fea.get('volmesh_torus.json')
volmesh = VolMesh.from_json(filepath)
# add shell elements from mesh -------------------------------------------------
s = Structure(path=compas_fea.TEMP, name='torus')
s.add_nodes_elements_from_volmesh(volmesh, elset='solids')
# add supports --------------------------------------------------------------
nkeys = list(volmesh.vertices_where({'z': 0}))
s.add_set(name='support_nodes', type='NODE', selection=nkeys)
supppots = FixedDisplacement(name='supports', nodes='support_nodes')
s.add_displacement(supppots)
# add materials and sections -----------------------------------------------
E = 35 * 10**9
v = .02
p = 2400
matname = 'concrete'
concrete = ElasticIsotropic(name=matname, E=E, v=v, p=p)
s.add_material(concrete)
section = SolidSection(name='concrete_sec')
s.add_section(section)
prop = ElementProperties(name='floor',
material=matname,
section='concrete_sec',
mdl = Structure(name='beam_grid', path='C:/Temp/')
# Beams
beams = [i for i in rs.LayerNames() if i[:2] in ['BX', 'BY']]
for beam in beams:
network = rhino.network_from_lines(rs.ObjectsByLayer(beam))
axes = {'ex': [0, 1, 0]} if 'X' in beam else {'ex': [1, 0, 0]}
mdl.add_nodes_elements_from_network(network=network,
element_type='BeamElement',
elset=beam,
axes=axes)
xyzs = [network.vertex_coordinates(i) for i in network.leaves()]
ends = [mdl.check_node_exists(i) for i in xyzs]
mdl.add_set('{0}_ends'.format(beam), type='node', selection=ends)
# Sets
rhino.add_sets_from_layers(mdl, layers=['lift_points'] + beams)
# Materials
mdl.add_material(
ElasticIsotropic(name='mat_elastic', E=5 * 10**9, v=0.3, p=1000))
# Sections
mdl.add_section(RectangularSection(name='sec_rectangular', h=0.005, b=0.005))
# Properties
# Author(s): Tomás Méndez Echenagucia (github.com/tmsmendez)
# Structure
mdl = Structure(name='beam_bench', path=compas_fea.TEMP)
# Nodes and Elements
xyz = [[0, 0, 0], [1, 0, 0]]
nodes = mdl.add_nodes(xyz)
beam = mdl.add_element(nodes, 'BeamElement', axes={'ex': [0, 1, 0]})
# Sets
elset_beams = mdl.add_set('elset_beams', 'element', [beam])
# Materials
mdl.add(Steel(name='mat_steel'))
# Sections
mdl.add(RectangularSection(name='sec_pipe', b=0.05, h=0.1))
# Properties
mdl.add(
Properties(name='ep_beam',
material='mat_steel',
section='sec_pipe',
# Structure
mdl = Structure(path='C:/Temp/', name='mesh_modal')
# Elements
mesh = Mesh.from_obj(compas.get('quadmesh.obj'))
mdl.add_nodes_elements_from_mesh(mesh=mesh,
element_type='ShellElement',
elset='elset_concrete')
# Sets
nodes = [i for i, node in mdl.nodes.items() if node.z < 0.01]
mdl.add_set(name='nset_pins', type='node', selection=nodes)
# Materials
mdl.add(ElasticIsotropic(name='mat_concrete', E=40 * 10**9, v=0.2, p=2400))
# Sections
mdl.add(ShellSection(name='sec_concrete', t=0.050))
# Properties
mdl.add(
Properties(name='ep_concrete',
material='mat_concrete',
section='sec_concrete',
# Mesh
ds = 0.05
Lx = 1
Ly = 2
Lz = 1
bmesh = bmesh=draw_plane(Lx=Lx, Ly=Ly, dx=ds, dy=ds)
blender.mesh_extrude(mdl, bmesh=bmesh, layers=int(Lz/ds), thickness=ds, blocks_name='elset_blocks')
# Sets
pins = [[ds, ds, 0], [Lx - ds, ds, 0], [Lx - ds, Ly - ds, 0], [ds, Ly - ds, 0]]
supports = [mdl.check_node_exists(i) for i in pins]
top = [mdl.check_node_exists([Lx * 0.5, Ly * 0.5, Lz])]
mdl.add_set(name='nset_supports', type='node', selection=supports)
mdl.add_set(name='nset_load', type='node', selection=top)
# Materials
mdl.add_material(ElasticIsotropic(name='mat_elastic', E=10**10, v=0.3, p=1))
# Sections
mdl.add_section(SolidSection(name='sec_solid'))
# Properties
mdl.add_element_properties(
Properties(name='ep_solid', material='mat_elastic', section='sec_solid', elsets='elset_blocks'))
mdl = Structure(name='block_deepbeam', path='C:/Temp/') # Mesh ds = 0.05 Lx = 1 Ly = 2 Lz = 1 mesh = get_object_by_name(name='plane') blender.mesh_extrude(mdl, mesh=mesh, layers=int(Lz / ds), thickness=ds, blocks_name='elset_blocks') # Sets pins = [[ds, ds, 0], [Lx - ds, ds, 0], [Lx - ds, Ly - ds, 0], [ds, Ly - ds, 0]] mdl.add_set(name='nset_supports', type='node', selection=[mdl.check_node_exists(i) for i in pins]) mdl.add_set(name='nset_load', type='node', selection=[mdl.check_node_exists([Lx * 0.5, Ly * 0.5, Lz])]) # Materials mdl.add(ElasticIsotropic(name='mat_elastic', E=10**10, v=0.3, p=1)) # Sections mdl.add(SolidSection(name='sec_solid')) # Properties mdl.add(Properties(name='ep_solid', material='mat_elastic', section='sec_solid', elset='elset_blocks')) # Displacements
