def get_properties():
# build the lists of points, facets, holes and control points
points = request.json['points']
facets = request.json['facets']
holes = request.json['holes']
control_points = request.json['controls']
# create the custom geometry object
geometry = sections.CustomSection(points, facets, holes, control_points)
geometry.clean_geometry() # clean the geometry
# create the mesh - use a smaller refinement for the angle region
mesh = geometry.create_mesh(mesh_sizes=[0.0005, 0.001])
# create a CrossSection object
section = CrossSection(geometry, mesh)
# perform a geometric, warping and plastic analysis
section.calculate_geometric_properties()
section.calculate_warping_properties()
section.calculate_plastic_properties()
properties = section.display_results()
return jsonify({'properties': properties})
def _analyze_common_structural_geometry(step, geometry, mesh_sizes, N, Vx, Vy,
Mxx, Myy, Mzz):
mesh = geometry.create_mesh(mesh_sizes=[mesh_sizes])
section = CrossSection(geometry, mesh)
finite_elements_number = len(section.mesh_elements)
if finite_elements_number > MAX_FINITE_ELEMENTS_NUMBER:
return False, None, None, None, None, None, None, None, None, None, None
elif finite_elements_number < MAX_FINITE_ELEMENTS_NUMBER and step == 'checking':
return True, None, None, None, None, None, None, None, None, None, None
else:
section.calculate_geometric_properties()
section.calculate_warping_properties()
loadcase = section.calculate_stress(N=N,
Vx=Vx,
Vy=Vy,
Mxx=Mxx,
Myy=Myy,
Mzz=Mzz)
nodes = section.mesh_nodes
stresses = loadcase.get_stress()[0]
area = section.get_area()
ixx_c, iyy_c, ixy_c = section.get_ic()
torsion_constant = section.get_j()
warping_constant = section.get_gamma()
elastic_centroid = section.get_c()
centroidal_shear_center = section.get_sc()
return True, nodes, stresses, area, ixx_c, iyy_c, ixy_c, torsion_constant, warping_constant, \
elastic_centroid, centroidal_shear_center
def calculate(self, loadProfileFromDB):
'''Se ejecuta el calculo de las propiedades de la seccion.
Referencia
----------
rx, ry : radio de giro del miembro | sqrt(I/A)
c_i : coordenada del centroide de la seccion
sc_i : coordenada del centro de corte
A : Area de la seccion
Cw : Constante torsional de warping de la seccion
J : Constante de torsion de St. Venant
Si : modulo elastico
j : mitad de la constante monociclica a compresion en eje -y- (beta22-)
'''
if loadProfileFromDB:
try:
self.load()
except:
loadProfileFromDB = False
pass
if not loadProfileFromDB:
## CALCULO PROPIEDADES A PARTIR DEL PAQUETE sectionproperties
geometry = sections.CeeSection(d=self.H, b=self.B+self.r_out, l=self.r_out, t=self.t, r_out=self.r_out, n_r=8)
# corto los labios y el radio
p1 = geometry.add_point([self.B, 0])
p2 = geometry.add_point([self.B, self.t])
p3 = geometry.add_point([self.B, self.H])
p4 = geometry.add_point([self.B, self.H-self.t])
geometry.add_facet([p1, p2])
geometry.add_facet([p3, p4])
geometry.add_hole([self.B+self.r_out/10, self.t/2]) # add hole
geometry.add_hole([self.B+self.r_out/10, self.H-self.t/2]) # add hole
geometry.clean_geometry() # clean the geometry
# create mesh
mesh = geometry.create_mesh(mesh_sizes=[self.t/4.0])
# creo la seccion
section = CrossSection(geometry, mesh)
# calculo las propiedades
section.calculate_geometric_properties()
section.calculate_warping_properties()
(self.c_x, self.c_y) = section.get_c() # centroides
(self.sc_x, self.sc_y) = section.get_sc() # shear center
self.Cw = section.get_gamma() # warping
(self.rx, self.ry) = section.get_rc() # radios de giro
self.J = section.get_j()
self.A = section.get_area()
self.Ae = section.get_area()
(self.Ix, self.Iy, _) = section.get_ic()
(self.Sx, _, _, _) = section.get_z() # modulo elastico
self.j = section.get_beta_p()[3]/2.0
self.save(section)
self.section = section
def calculate(self, loadProfileFromDB):
'''Se ejecuta el calculo de las propiedades de la seccion.
Parameters
----------
loadProfileFromDB: bool
indica si se debe intentar cargar el perfil desde la base de datos
Referencia
----------
rx, ry : radio de giro del miembro | sqrt(I/A)
c_i : coordenada del centroide de la seccion
sc_i : coordenada del centro de corte
A : Area de la seccion
Cw : Constante torsional de warping de la seccion
J : Constante de torsion de St. Venant
Si : modulo elastico
j : mitad de la constante monociclica a compresion en eje -y- (beta22-)
'''
if loadProfileFromDB:
try:
self.load()
except:
loadProfileFromDB = False
pass
if not loadProfileFromDB:
## CALCULO PROPIEDADES A PARTIR DEL PAQUETE sectionproperties
geometry = sections.CeeSection(d=self.H, b=self.B, l=self.D, t=self.t, r_out=self.r_out, n_r=8)
# create mesh
mesh = geometry.create_mesh(mesh_sizes=[self.t/4.0])
# creo la seccion
section = CrossSection(geometry, mesh)
# calculo las propiedades
section.calculate_geometric_properties()
section.calculate_warping_properties()
(self.c_x, self.c_y) = section.get_c() # centroides
(self.sc_x, self.sc_y) = section.get_sc() # shear center
self.Cw = section.get_gamma() # warping
(self.rx, self.ry) = section.get_rc() # radios de giro
self.J = section.get_j() # St Venant
self.A = section.get_area()
self.Ae = section.get_area()
(self.Ix, self.Iy, _) = section.get_ic()
(self.Sx, _, _, _) = section.get_z() # modulo elastico
self.j = section.get_beta_p()[3]/2.0
self.save(section)
self.section = section
geometry.plot_geometry() # plot the geometry
# create a mesh - use a mesh size of 5 for the UB, 20 for the panel
mesh = geometry.create_mesh(mesh_sizes=[5, 20])
# create a CrossSection object - take care to list the materials in the same order as entered into
# the MergedSection
section = CrossSection(geometry, mesh, materials=[steel, timber])
section.display_mesh_info() # display the mesh information
# plot the mesh with coloured materials and a line transparency of 0.5
section.plot_mesh(materials=True, alpha=0.5)
# perform a geometric, warping and plastic analysis
section.calculate_geometric_properties(time_info=True)
section.calculate_warping_properties(time_info=True)
section.calculate_plastic_properties(time_info=True, verbose=True)
# perform a stress analysis with N = 100 kN, Mxx = 120 kN.m and Vy = 75 kN
stress_post = section.calculate_stress(N=-100e3,
Mxx=-120e6,
Vy=-75e3,
time_info=True)
# print the results to the terminal
section.display_results()
# plot the centroids
section.plot_centroids()
stress_post.plot_stress_n_zz(pause=False) # plot the axial stress
def calculate(self, loadProfileFromDB):
'''Se ejecuta el calculo de las propiedades de la seccion.
Referencia
----------
rx, ry : radio de giro de la seccion | sqrt(I/A)
ri : radio de giro en -y- de un solo perfil c
c_x, c_y : coordenada del centroide de la seccion
sc_x, sc_y : coordenada del centro de corte
A : Area de la seccion
Cw : Constante torsional de warping de la seccion
J : Constante de torsion de St. Venant
Si : modulo elastico
j : mitad de la constante monociclica a compresion en eje -y- (beta22-)
'''
if loadProfileFromDB:
try:
self.load()
except:
loadProfileFromDB = False
pass
if not loadProfileFromDB:
c0 = c_profile(H= self.H, B= self. B, t= self.t, r_out= self.r_out)
c0.calculate(loadProfileFromDB)
c1 = sections.CeeSection(d=self.H, b=self.B+self.r_out, l=self.r_out, t=self.t, r_out=self.r_out, n_r=8)
c2 = deepcopy(c1)
# corto los labios y el radio c1
p1 = c1.add_point([self.B, 0])
p2 = c1.add_point([self.B, self.t])
p3 = c1.add_point([self.B, self.H])
p4 = c1.add_point([self.B, self.H-self.t])
c1.add_facet([p1, p2])
c1.add_facet([p3, p4])
c1.add_hole([self.B+self.r_out/10, self.t/2]) # add hole
c1.add_hole([self.B+self.r_out/10, self.H-self.t/2]) # add hole
c1.clean_geometry() # clean the geometry
c2 = deepcopy(c1)
c2.mirror_section(axis= 'y', mirror_point=[0, 0])
if self.s:
c1.shift = [self.s/2, 0]
c1.shift_section()
c2.shift = [-self.s/2, 0]
c2.shift_section()
# soldadura en los extremos del alma
if self.wld:
h = self.wld*self.r_out # weld length
a = self.wld*self.r_out*2 + self.s # base de la soldadura
weld1 = sections.CustomSection(
points=[[a/2,0], [-a/2, 0], [0, h]],
facets=[[0,1], [1,2], [2,0]],
holes=[],
control_points=[[h / 3, h / 3]]
)
weld2 = deepcopy(weld1)
weld2.mirror_section(axis= 'x', mirror_point=[0, 0])
weld2.shift = [0, self.H]
weld2.shift_section()
geometry = sections.MergedSection([c1, c2, weld1, weld2])
geometry.clean_geometry(verbose= False)
if self.s:
geometry.add_hole([0, self.H/2])
mesh = geometry.create_mesh(mesh_sizes=[self.mesh_size, self.mesh_size, self.mesh_size, self.mesh_size])
else:
geometry = sections.MergedSection([c1, c2])
geometry.clean_geometry()
mesh = geometry.create_mesh(mesh_sizes=[self.mesh_size, self.mesh_size])
section = CrossSection(geometry, mesh)
#mesh_c1 = c1.create_mesh(mesh_sizes=[self.mesh_size])
#section_c1 = CrossSection(c1, mesh_c1)
#section_c1.calculate_geometric_properties()
#section_c1.calculate_warping_properties()
section.calculate_geometric_properties()
section.calculate_warping_properties()
(self.c_x, self.c_y) = section.get_c() # centroides
(self.sc_x, self.sc_y) = section.get_sc() # shear center
self.Cw = section.get_gamma() # warping
(self.rx, self.ry) = section.get_rc() # radios de giro
self.J = section.get_j()
self.A = section.get_area()
self.Ae = self.A
self.ri = c0.ry # radios de giro y de c1
(self.Ix, self.Iy, _) = section.get_ic()
(self.Sx, _, _, _) = section.get_z() # modulo elastico
self.j = section.get_beta_p()[3]/2.0
self.save(section)
self.section = section
def test_angle(self):
"""Section properties are validated against results from the Strand7
beam section utility."""
geometry = sections.AngleSection(d=150,
b=90,
t=12,
r_r=10,
r_t=5,
n_r=8)
mesh = geometry.create_mesh(mesh_sizes=[2.5])
section = CrossSection(geometry, mesh)
val_list = []
val_list.append({"prop": "area", "val": 2746.73, "tol": 2e-4})
val_list.append({"prop": "perimeter", "val": 471, "tol": 1e-3})
val_list.append({"prop": "cx", "val": 21.2255, "tol": 2e-4})
val_list.append({"prop": "cy", "val": 50.9893, "tol": 2e-4})
val_list.append({"prop": "ixx_g", "val": 1.3428e7, "tol": 2e-4})
val_list.append({"prop": "iyy_g", "val": 2.95629e6, "tol": 2e-4})
val_list.append({"prop": "ixy_g", "val": 1.08669e6, "tol": 2e-4})
val_list.append({"prop": "ixx_c", "val": 6.28678e6, "tol": 2e-4})
val_list.append({"prop": "iyy_c", "val": 1.71882e6, "tol": 3e-4})
val_list.append({"prop": "ixy_c", "val": -1.88603e6, "tol": 3e-4})
val_list.append({"prop": "zxx_plus", "val": 63496.0, "tol": 2e-4})
val_list.append({"prop": "zxx_minus", "val": 123296, "tol": 2e-4})
val_list.append({"prop": "zyy_plus", "val": 24992.1, "tol": 3e-4})
val_list.append({"prop": "zyy_minus", "val": 80979.0, "tol": 2e-4})
val_list.append({"prop": "rx", "val": 47.8416, "tol": 2e-4})
val_list.append({"prop": "ry", "val": 25.0154, "tol": 2e-4})
val_list.append({"prop": "i11_c", "val": 6.96484e6, "tol": 2e-4})
val_list.append({"prop": "i22_c", "val": 1.04076e6, "tol": 2e-4})
val_list.append({"prop": "phi", "val": 19.7744 - 180, "tol": 2e-4})
val_list.append({"prop": "z11_plus", "val": 97751.9, "tol": 2e-4})
val_list.append({"prop": "z11_minus", "val": 69403.3, "tol": 2e-4})
val_list.append({"prop": "z22_plus", "val": 27959.0, "tol": 2e-4})
val_list.append({"prop": "z22_minus", "val": 20761.6, "tol": 3e-4})
val_list.append({"prop": "r11", "val": 50.3556, "tol": 2e-4})
val_list.append({"prop": "r22", "val": 19.4656, "tol": 2e-4})
val_list.append({"prop": "sxx", "val": 113541, "tol": 2e-4})
val_list.append({"prop": "syy", "val": 45724.6, "tol": 2e-4})
val_list.append({
"prop": "sf_xx_plus",
"val": 113541 / 63496.0,
"tol": 2e-4
})
val_list.append({
"prop": "sf_xx_minus",
"val": 113541 / 123296,
"tol": 2e-4
})
val_list.append({
"prop": "sf_yy_plus",
"val": 45724.6 / 24992.1,
"tol": 3e-4
})
val_list.append({
"prop": "sf_yy_minus",
"val": 45724.6 / 80979.0,
"tol": 2e-4
})
val_list.append({"prop": "s11", "val": 121030, "tol": 2e-4})
val_list.append({"prop": "s22", "val": 43760.6, "tol": 2e-4})
val_list.append({
"prop": "sf_11_plus",
"val": 121030 / 97751.9,
"tol": 2e-4
})
val_list.append({
"prop": "sf_11_minus",
"val": 121030 / 69403.3,
"tol": 2e-4
})
val_list.append({
"prop": "sf_22_plus",
"val": 43760.6 / 27959.0,
"tol": 2e-4
})
val_list.append({
"prop": "sf_22_minus",
"val": 43760.6 / 20761.6,
"tol": 3e-4
})
val_list.append({"prop": "j", "val": 135333, "tol": 1e-3})
val_list.append({"prop": "gamma", "val": 1.62288e8, "tol": 5e-4})
val_list.append({"prop": "A_s11", "val": 885.444, "tol": 2e-4})
val_list.append({"prop": "A_s22", "val": 1459.72, "tol": 4e-4})
val_list.append({"prop": "x11_se", "val": 28.719, "tol": 1e-3})
val_list.append({"prop": "y22_se", "val": 35.2348, "tol": 5e-4})
section.calculate_geometric_properties()
section.calculate_plastic_properties()
section.calculate_warping_properties()
validate_properties(self, val_list, section)
def test_custom(self):
"""Section properties are validated against results from the Strand7
beam section utility."""
points = [[-10, 0], [110, 0], [100, 10], [55, 10], [55, 90], [100, 90],
[110, 100], [110, 110], [-10, 110], [-10, 100], [0, 90],
[45, 90], [45, 10], [-10, 10]]
facets = [[0, 1], [1, 2], [2, 3], [3, 4], [4, 5], [5, 6], [6,
7], [7, 8],
[8, 9], [9, 10], [10, 11], [11, 12], [12, 13], [13, 0]]
holes = []
control_points = [[0, 5]]
geometry = sections.CustomSection(points, facets, holes,
control_points)
mesh = geometry.create_mesh(mesh_sizes=[5])
section = CrossSection(geometry, mesh)
val_list = []
val_list.append({"prop": "area", "val": 4250, "tol": None})
val_list.append({"prop": "cx", "val": 49.3333, "tol": None})
val_list.append({"prop": "cy", "val": 65.0196, "tol": None})
val_list.append({"prop": "ixx_g", "val": 2.56725e7, "tol": None})
val_list.append({"prop": "iyy_g", "val": 1.41858e7, "tol": None})
val_list.append({"prop": "ixy_g", "val": 1.37979e7, "tol": None})
val_list.append({"prop": "ixx_c", "val": 7.70542e6, "tol": None})
val_list.append({"prop": "iyy_c", "val": 3.84228e6, "tol": None})
val_list.append({"prop": "ixy_c", "val": 165472, "tol": None})
val_list.append({"prop": "zxx_plus", "val": 171306, "tol": None})
val_list.append({"prop": "zxx_minus", "val": 118509, "tol": None})
val_list.append({"prop": "zyy_plus", "val": 63334.2, "tol": None})
val_list.append({"prop": "zyy_minus", "val": 64757.5, "tol": None})
val_list.append({"prop": "rx", "val": 42.5798, "tol": None})
val_list.append({"prop": "ry", "val": 30.0677, "tol": None})
val_list.append({"prop": "phi", "val": 177.552 - 180, "tol": 1e-4})
val_list.append({"prop": "i11_c", "val": 7.71249e6, "tol": None})
val_list.append({"prop": "i22_c", "val": 3.8352e6, "tol": None})
val_list.append({"prop": "z11_plus", "val": 162263, "tol": None})
val_list.append({"prop": "z11_minus", "val": 114268, "tol": None})
val_list.append({"prop": "z22_plus", "val": 60503.0, "tol": None})
val_list.append({"prop": "z22_minus", "val": 62666.1, "tol": None})
val_list.append({"prop": "r11", "val": 42.5993, "tol": None})
val_list.append({"prop": "r22", "val": 30.04, "tol": None})
val_list.append({"prop": "sxx", "val": 153196, "tol": None})
val_list.append({"prop": "syy", "val": 101494, "tol": None})
val_list.append({
"prop": "sf_xx_plus",
"val": 153196 / 171306,
"tol": None
})
val_list.append({
"prop": "sf_xx_minus",
"val": 153196 / 118509,
"tol": None
})
val_list.append({
"prop": "sf_yy_plus",
"val": 101494 / 63334.2,
"tol": None
})
val_list.append({
"prop": "sf_yy_minus",
"val": 101494 / 64757.5,
"tol": None
})
val_list.append({"prop": "s11", "val": 153347, "tol": None})
val_list.append({"prop": "s22", "val": 101501, "tol": None})
val_list.append({
"prop": "sf_11_plus",
"val": 153347 / 162263,
"tol": None
})
val_list.append({
"prop": "sf_11_minus",
"val": 153347 / 114268,
"tol": None
})
val_list.append({
"prop": "sf_22_plus",
"val": 101501 / 60503.0,
"tol": None
})
val_list.append({
"prop": "sf_22_minus",
"val": 101501 / 62666.1,
"tol": None
})
val_list.append({"prop": "j", "val": 347040, "tol": 5e-3})
val_list.append({"prop": "gamma", "val": 7.53539e9, "tol": 1e-3})
val_list.append({"prop": "A_s11", "val": 2945.53, "tol": 5e-4})
val_list.append({"prop": "A_s22", "val": 956.014, "tol": 5e-4})
val_list.append({"prop": "x11_se", "val": 1.9134, "tol": 5e-3})
val_list.append({"prop": "y22_se", "val": 3.02028, "tol": 5e-3})
section.calculate_geometric_properties()
section.calculate_plastic_properties()
section.calculate_warping_properties()
validate_properties(self, val_list, section)
class TestRectangle(unittest.TestCase):
"""Section properties are mostly validated against hand calcs. Results from
Strand7 and Roark's Formulas for Stress and Strain are used for some
warping properties."""
def setUp(self):
self.geometry = sections.RectangularSection(d=100, b=50)
self.mesh = self.geometry.create_mesh(mesh_sizes=[10])
self.section = CrossSection(self.geometry, self.mesh)
def test_geometric(self):
self.section.calculate_geometric_properties()
val_list = []
val_list.append({"prop": "area", "val": 100 * 50, "tol": None})
val_list.append({
"prop": "perimeter",
"val": 100 * 2 + 50 * 2,
"tol": None
})
val_list.append({"prop": "ea", "val": 1 * 100 * 50, "tol": None})
val_list.append({"prop": "qx", "val": 100 * 50 * 50, "tol": None})
val_list.append({"prop": "qy", "val": 100 * 50 * 25, "tol": None})
val_list.append({"prop": "ixx_g", "val": 50 * 100**3 / 3, "tol": None})
val_list.append({"prop": "iyy_g", "val": 100 * 50**3 / 3, "tol": None})
val_list.append({
"prop": "ixy_g",
"val": 100 * 50 * 50 * 25,
"tol": None
})
val_list.append({"prop": "cx", "val": 50 / 2, "tol": None})
val_list.append({"prop": "cy", "val": 100 / 2, "tol": None})
val_list.append({
"prop": "ixx_c",
"val": 50 * 100**3 / 12,
"tol": None
})
val_list.append({
"prop": "iyy_c",
"val": 100 * 50**3 / 12,
"tol": None
})
val_list.append({"prop": "ixy_c", "val": 0, "tol": None})
val_list.append({
"prop": "zxx_plus",
"val": 50 * 100**2 / 6,
"tol": None
})
val_list.append({
"prop": "zxx_minus",
"val": 50 * 100**2 / 6,
"tol": None
})
val_list.append({
"prop": "zyy_plus",
"val": 100 * 50**2 / 6,
"tol": None
})
val_list.append({
"prop": "zyy_minus",
"val": 100 * 50**2 / 6,
"tol": None
})
val_list.append({
"prop": "rx",
"val": (50 * 100**3 / 12 / 100 / 50)**0.5,
"tol": None
})
val_list.append({
"prop": "ry",
"val": (100 * 50**3 / 12 / 100 / 50)**0.5,
"tol": None
})
val_list.append({
"prop": "i11_c",
"val": 50 * 100**3 / 12,
"tol": None
})
val_list.append({
"prop": "i22_c",
"val": 100 * 50**3 / 12,
"tol": None
})
val_list.append({"prop": "phi", "val": 0, "tol": None})
val_list.append({
"prop": "z11_plus",
"val": 50 * 100**2 / 6,
"tol": None
})
val_list.append({
"prop": "z11_minus",
"val": 50 * 100**2 / 6,
"tol": None
})
val_list.append({
"prop": "z22_plus",
"val": 100 * 50**2 / 6,
"tol": None
})
val_list.append({
"prop": "z22_minus",
"val": 100 * 50**2 / 6,
"tol": None
})
val_list.append({
"prop": "r11",
"val": (50 * 100**3 / 12 / 100 / 50)**0.5,
"tol": None
})
val_list.append({
"prop": "r22",
"val": (100 * 50**3 / 12 / 100 / 50)**0.5,
"tol": None
})
validate_properties(self, val_list, self.section)
def test_plastic(self):
self.section.calculate_geometric_properties()
self.section.calculate_plastic_properties()
val_list = []
val_list.append({"prop": "x_pc", "val": 50 / 2, "tol": None})
val_list.append({"prop": "y_pc", "val": 100 / 2, "tol": None})
val_list.append({"prop": "x11_pc", "val": 50 / 2, "tol": None})
val_list.append({"prop": "y22_pc", "val": 100 / 2, "tol": None})
val_list.append({"prop": "sxx", "val": 50 * 100**2 / 4, "tol": None})
val_list.append({"prop": "syy", "val": 100 * 50**2 / 4, "tol": None})
val_list.append({"prop": "s11", "val": 50 * 100**2 / 4, "tol": None})
val_list.append({"prop": "s22", "val": 100 * 50**2 / 4, "tol": None})
val_list.append({"prop": "sf_xx_plus", "val": 1.5, "tol": None})
val_list.append({"prop": "sf_xx_minus", "val": 1.5, "tol": None})
val_list.append({"prop": "sf_yy_plus", "val": 1.5, "tol": None})
val_list.append({"prop": "sf_yy_minus", "val": 1.5, "tol": None})
val_list.append({"prop": "sf_11_plus", "val": 1.5, "tol": None})
val_list.append({"prop": "sf_11_minus", "val": 1.5, "tol": None})
val_list.append({"prop": "sf_22_plus", "val": 1.5, "tol": None})
val_list.append({"prop": "sf_22_minus", "val": 1.5, "tol": None})
validate_properties(self, val_list, self.section)
def test_warping(self):
self.section.calculate_geometric_properties()
self.section.calculate_warping_properties()
val_list = []
val_list.append({"prop": "j", "val": 2861002, "tol": 0.04}) # roark's
val_list.append({"prop": "j", "val": 2.85852e6, "tol": 2e-5}) # st7
val_list.append({
"prop": "gamma",
"val": 3.17542e8,
"tol": None
}) # st7
val_list.append({"prop": "x_se", "val": 50 / 2, "tol": None})
val_list.append({"prop": "y_se", "val": 100 / 2, "tol": None})
val_list.append({"prop": "x11_se", "val": 0, "tol": None})
val_list.append({"prop": "y22_se", "val": 0, "tol": None})
val_list.append({"prop": "x_st", "val": 50 / 2, "tol": None})
val_list.append({"prop": "y_st", "val": 100 / 2, "tol": None})
val_list.append({"prop": "A_sx", "val": 5 / 6 * 100 * 50, "tol": None})
val_list.append({"prop": "A_sy", "val": 5 / 6 * 100 * 50, "tol": None})
val_list.append({
"prop": "A_s11",
"val": 5 / 6 * 100 * 50,
"tol": None
})
val_list.append({
"prop": "A_s22",
"val": 5 / 6 * 100 * 50,
"tol": None
})
class Beam(Component):
'''Beam is a wrapper for emergent useful properties of the structure'''
structure = attr.ib() #parent structure, will be in its _beams
name = attr.ib()
material = attr.ib(validator=attr.validators.instance_of(SolidMaterial))
section = attr.ib(validator=attr.validators.instance_of((
sectionproperties.pre.sections.Geometry, ottgeo.Profile2D,
type(None))))
mesh_size = attr.ib(default=3)
in_Iy = attr.ib(default=None,
validator=attr.validators.instance_of(
(int, float, nonetype)))
in_Ix = attr.ib(default=None,
validator=attr.validators.instance_of(
(int, float, nonetype)))
in_J = attr.ib(default=None,
validator=attr.validators.instance_of(
(int, float, nonetype)))
in_A = attr.ib(default=None,
validator=attr.validators.instance_of(
(int, float, nonetype)))
_L = None
_section_properties = None
_ITensor = None
min_stress_xy = None #set to true or false
def __on_init__(self):
self.info('initalizing...')
self._skip_attr = ['mesh_size', 'in_Iy', 'in_Ix', 'in_J', 'in_A']
self.update_section(self.section)
def update_section(self, section):
self.section = section
self.debug(f'determining {section} properties...')
if isinstance(self.section, sectionproperties.pre.sections.Geometry):
self.debug(f'determining mesh {section} properties...')
mesh = self.section.create_mesh([self.mesh_size])
self._section_properties = CrossSection(self.section,
mesh) #no material here
self._section_properties.calculate_geometric_properties()
self._section_properties.calculate_warping_properties()
elif isinstance(self.section, ottgeo.Profile2D):
self.debug(f'determining profile {section} properties...')
self._section_properties = self.section
else:
self.debug(f'checking input values')
assert all([
val is not None
for val in (self.in_Iy, self.in_Ix, self.in_J, self.in_A)
])
def apply_pt_load(self, gFx, gFy, gFz, x, case='Case 1'):
'''add a force in a global orientation'''
Fvec = numpy.array([gFx, gFy, gFz])
self.debug(f'adding pt load {Fvec}')
Floc = self.ReverseRotationMatrix.dot(Fvec)
Flx = Floc[0]
Fly = Floc[1]
Flz = Floc[2]
for Fkey, Fval in [('Fx', Flx), ('Fy', Fly), ('Fz', Flz)]:
if Fval:
self.debug(f'adding {Fkey}={Fval}')
self.structure.frame.AddMemberPtLoad(self.member.Name, Fkey,
Fval, x)
import sectionproperties.pre.sections as sections from sectionproperties.analysis.cross_section import CrossSection # create a 150x100x6 RHS on its side geometry = sections.Rhs(d=100, b=150, t=6, r_out=15, n_r=8) # create a mesh with a maximum area of 2 mesh = geometry.create_mesh(mesh_sizes=[2]) # create a CrossSection object section = CrossSection(geometry, mesh) # perform a geometry and warping analysis section.calculate_geometric_properties() section.calculate_warping_properties() # perform a stress analysis with Mx = 5 kN.m; Vx = 10 kN and Mzz = 3 kN.m case1 = section.calculate_stress(Mxx=5e6, Vx=10e3, Mzz=3e6) # perform a stress analysis with My = 15 kN.m; Vy = 30 kN and Mzz = 1.5 kN.m case2 = section.calculate_stress(Myy=15e6, Vy=30e3, Mzz=1.5e6) case1.plot_stress_m_zz(pause=False) # plot the bending stress for case1 case1.plot_vector_mzz_zxy(pause=False) # plot the torsion vectors for case1 case2.plot_stress_v_zxy(pause=False) # plot the shear stress for case1 case1.plot_stress_vm(pause=False) # plot the von mises stress for case1 case2.plot_stress_vm() # plot the von mises stress for case2
def process_geometry(geometry, mesh_sizes, loadcases):
# update this to receive the geometry, mesh info, material and loads
# generate a finite element mesh
mesh = geometry.create_mesh(mesh_sizes=mesh_sizes)
# generate material - can be overwritten if needed --all in N and cm
# create a CrossSection object for analysis
section = CrossSection(geometry, mesh)
# calculate various cross-section properties
section.calculate_geometric_properties()
section.calculate_warping_properties()
section.calculate_plastic_properties()
# Area
area = section.get_area()
sheararea = section.get_As()
asx = sheararea[0]
asy = sheararea[1]
# Second Moment of Area about centroid
(ixx, iyy, ixy) = section.get_ic()
# Centroid
(xg, yg) = section.get_c()
# Radii of Gyration
(rxx, ryy) = section.get_rc()
# Principal bending axis angle
phi = section.get_phi()
# St. Venant torsion constant
ipp = section.get_j()
# Warping Constant
cw = section.get_gamma()
# Elastic Section Moduli
(welx_top, welx_bottom, wely_top, wely_bottom) = section.get_z()
# Plastic Section Moduli
(wplx, wply) = section.get_s()
# plot centroid to image
section.plot_centroids(pause=False)
buf = io.BytesIO()
plt.savefig(buf, format='png', bbox_inches='tight')
buf.seek(0)
plot_centroid = base64.b64encode(buf.getvalue()).decode()
plt.close()
# calculate torsion resistance from stress and torque
#from the below can also return torsional stress if wanted
stress_post = section.calculate_stress(Mzz=10)
unit_mzz_zxy = []
maxstress = []
for group in stress_post.material_groups:
maxstress.append(max(group.stress_result.sig_zxy_mzz))
unit_mzz_zxy.append(group.stress_result.sig_zxy_mzz.tolist())
#there should be only one maxstress value therefore:
wt = 10 / maxstress[0]
#plot this image
stress_post.plot_stress_mzz_zxy(pause=False)
buf = io.BytesIO()
plt.savefig(buf, format='png', bbox_inches='tight')
buf.seek(0)
plot_unittorsionstress = base64.b64encode(buf.getvalue()).decode()
plt.close()
#foreach load case submitted calculate vm stress state and create image
vmStressImages = {}
vmStressStates = {}
for loadcase in loadcases:
lc_name = loadcase[0]
s_n = loadcase[1]
s_vx = loadcase[2]
s_vy = loadcase[3]
s_mxx = loadcase[4]
s_myy = loadcase[5]
s_mzz = loadcase[6]
stress_post = section.calculate_stress(N=s_n,
Vx=s_vx,
Vy=s_vy,
Mxx=s_mxx,
Myy=s_myy,
Mzz=s_mzz)
stress_state = []
for group in stress_post.material_groups:
stress_state.append(group.stress_result.sig_vm.tolist())
vmStressStates['lc_' + str(lc_name) + '_vm_stress'] = stress_state
#plot this image
stress_post.plot_stress_vm(pause=False)
buf = io.BytesIO()
plt.savefig(buf, format='png', bbox_inches='tight')
buf.seek(0)
vmStressImages['lc_' + str(lc_name) + '_vm_stress'] = base64.b64encode(
buf.getvalue()).decode()
plt.close()
# create rhino mesh
rmesh = rhino_mesh_from_meshpy(mesh)
# return send_file(path, as_attachment=True)
# get some of the calculated section properties
return_data = {}
return_data['properties'] = {
'area': area,
'Avx': asx,
'Avy': asy,
'xg': xg,
'yg': yg,
'rxx': rxx,
'ryy': ryy,
'phi': phi,
'ixx': ixx,
'iyy': iyy,
'ipp': ipp,
'cw': cw,
'welx+': welx_top,
'welx-': welx_bottom,
'wely+': wely_top,
'wely-': wely_bottom,
'wplx': wplx,
'wply': wply,
'wt': wt,
}
return_data['geometry'] = {
'mesh': rhino.CommonObject.Encode(rmesh),
}
return_data['images'] = {
'centroids': plot_centroid,
'unittorsion_vxy_stress': plot_unittorsionstress,
}
return_data['images'].update(vmStressImages)
return_data['stress_results'] = {
'unittorsion_vxy_stress': unit_mzz_zxy,
}
return_data['stress_results'].update(vmStressStates)
return return_data
class OneSec:
"""表示一个截面"""
def __init__(self, pls):
"""
单独截面
:param pls: 多条 cad 多段线对象组成的列表，其中应有一根指示控制点的线
"""
# 原始线和控制点
self.pls_origin = []
self.points = []
for i in pls:
if i.area == 0:
self.points = i.id
else:
self.pls_origin.append(i)
# 对线段进行排序，得到分离节点和完整节点
self.areas = np.array([i.area for i in self.pls_origin])
self.pls = np.array(self.pls_origin)[np.argsort(self.areas)][::-1]
self.ids_sep = [i.id for i in self.pls]
self.ids = [j.tolist() for i in self.ids_sep for j in i]
# 获取节点连接方式
self.faces = []
id_num = 0
for i in self.ids_sep:
id_num_0 = id_num
for j in i:
connect = [
id_num, id_num_0
] if id_num + 1 == id_num_0 + len(i) else [id_num, id_num + 1]
self.faces.append(connect)
id_num += 1
# 定义其他所需值
self.geo = 0
self.mesh = 0
self.sec = 0
self.prop = {}
self.stress = 0
self.corner = []
self.ids_to_c = []
def sec_cal(self, mesh=0.01, d=0.03):
"""
对单个截面进行属性计算
:param mesh: 截面划分单元尺寸
:param d: 截取形心附近应力范围
:return: 无
"""
self.geo = sections.CustomSection(self.ids, self.faces,
self.points[1:], [self.points[0]])
self.mesh = self.geo.create_mesh(mesh_sizes=[mesh])
self.sec = CrossSection(self.geo, self.mesh)
self.sec.plot_mesh()
self.sec.calculate_geometric_properties()
self.sec.calculate_warping_properties()
# 获取截面属性
prop = self.sec.section_props
self.prop['center'] = self.sec.get_c()
self.ids_to_c = [i - self.prop['center'] for i in self.ids_sep]
self.prop['area'] = prop.area
self.prop['as'] = [prop.A_s22, prop.A_s11]
self.prop['i'] = [prop.j, prop.ixx_c, prop.iyy_c]
pts = np.array(self.ids)
left = prop.cx - pts[:, 0].min()
right = pts[:, 0].max() - prop.cx
top = pts[:, 1].max() - prop.cy
bot = prop.cy - pts[:, 1].min()
self.prop['c'] = [right, left, top, bot]
self.stress = self.sec.calculate_stress(Vx=1, Vy=1)
stresses = self.stress.get_stress()
dy = self.sec.get_c()[1] - self.sec.mesh_nodes[:, 1]
dx = self.sec.get_c()[0] - self.sec.mesh_nodes[:, 0]
qyb = stresses[0]['sig_zy_vy'][dx < d].max() * prop.ixx_c
qzb = stresses[0]['sig_zx_vx'][dy < d].max() * prop.iyy_c
self.prop['q'] = [qyb, qzb]
self.prop['p'] = [
self.pls[0].length,
sum([i.length for i in self.pls[1:]])
]
# 获取角点
pt_all = self.ids_to_c[0]
pt_1 = pt_all[(pt_all[:, 0] < 0) & (pt_all[:, 1] > 0)]
pt_2 = pt_all[(pt_all[:, 0] > 0) & (pt_all[:, 1] > 0)]
pt_3 = pt_all[(pt_all[:, 0] < 0) & (pt_all[:, 1] < 0)]
pt_4 = pt_all[(pt_all[:, 0] > 0) & (pt_all[:, 1] < 0)]
pt_1 = find_pt(pt_1, relation='max')
pt_2 = find_pt(pt_2, relation='max')
pt_3 = find_pt(pt_3, relation='max')
pt_4 = find_pt(pt_4, relation='max')
self.corner = [pt_1, pt_2, pt_4, pt_3]