def get_inelastic_response(mass,
k_spring,
f_yield,
motion,
dt,
xi=0.05,
r_post=0.0):
"""
Run seismic analysis of a nonlinear SDOF
:param mass: SDOF mass
:param k_spring: spring stiffness
:param f_yield: yield strength
:param motion: list, acceleration values
:param dt: float, time step of acceleration values
:param xi: damping ratio
:param r_post: post-yield stiffness
:return:
"""
op.wipe()
op.model('basic', '-ndm', 2, '-ndf', 3) # 2 dimensions, 3 dof per node
# Establish nodes
bot_node = 1
top_node = 2
op.node(bot_node, 0., 0.)
op.node(top_node, 0., 0.)
# Fix bottom node
op.fix(top_node, opc.FREE, opc.FIXED, opc.FIXED)
op.fix(bot_node, opc.FIXED, opc.FIXED, opc.FIXED)
# Set out-of-plane DOFs to be slaved
op.equalDOF(1, 2, *[2, 3])
# nodal mass (weight / g):
op.mass(top_node, mass, 0., 0.)
# Define material
bilinear_mat_tag = 1
mat_type = "Steel01"
mat_props = [f_yield, k_spring, r_post]
op.uniaxialMaterial(mat_type, bilinear_mat_tag, *mat_props)
# Assign zero length element
beam_tag = 1
op.element('zeroLength', beam_tag, bot_node, top_node, "-mat",
bilinear_mat_tag, "-dir", 1, '-doRayleigh', 1)
# Define the dynamic analysis
load_tag_dynamic = 1
pattern_tag_dynamic = 1
values = list(-1 * motion) # should be negative
op.timeSeries('Path', load_tag_dynamic, '-dt', dt, '-values', *values)
op.pattern('UniformExcitation', pattern_tag_dynamic, opc.X, '-accel',
load_tag_dynamic)
# set damping based on first eigen mode
angular_freq = op.eigen('-fullGenLapack', 1)**0.5
alpha_m = 0.0
beta_k = 2 * xi / angular_freq
beta_k_comm = 0.0
beta_k_init = 0.0
op.rayleigh(alpha_m, beta_k, beta_k_init, beta_k_comm)
# Run the dynamic analysis
op.wipeAnalysis()
op.algorithm('Newton')
op.system('SparseGeneral')
op.numberer('RCM')
op.constraints('Transformation')
op.integrator('Newmark', 0.5, 0.25)
op.analysis('Transient')
tol = 1.0e-10
iterations = 10
op.test('EnergyIncr', tol, iterations, 0, 2)
analysis_time = (len(values) - 1) * dt
analysis_dt = 0.001
outputs = {
"time": [],
"rel_disp": [],
"rel_accel": [],
"rel_vel": [],
"force": []
}
while op.getTime() < analysis_time:
curr_time = op.getTime()
op.analyze(1, analysis_dt)
outputs["time"].append(curr_time)
outputs["rel_disp"].append(op.nodeDisp(top_node, 1))
outputs["rel_vel"].append(op.nodeVel(top_node, 1))
outputs["rel_accel"].append(op.nodeAccel(top_node, 1))
op.reactions()
outputs["force"].append(
-op.nodeReaction(bot_node, 1)) # Negative since diff node
op.wipe()
for item in outputs:
outputs[item] = np.array(outputs[item])
return outputs
# define section geometry
HCol = 60.0 # Column Depth
BCol = 60.0 # Column Width
PCol = Weight # nodal dead-load weight per column
g = 386.4
Mass = PCol / g
ACol = HCol * BCol * 1000 # cross-sectional area, make stiff
IzCol = (BCol * math.pow(HCol, 3)) / 12 # Column moment of inertia
op.node(1, 0.0, 0.0)
op.node(2, 0.0, LCol)
op.fix(1, 1, 1, 1)
op.mass(2, Mass, 1e-9, 0.0)
#Define Elements and Sections
ColMatTagFlex = 2
ColMatTagAxial = 3
ColSecTag = 1
BeamSecTag = 2
fc = -4.0 # CONCRETE Compressive Strength (+Tension, -Compression)
Ec = 57 * math.sqrt(
-fc *
1000) # Concrete Elastic Modulus (the term in sqr root needs to be in psi
#Column Section
E = 3.2e10
rho = 2400.
muCol = rho * Acol
muGir = rho * Agir
massCol = ['-mass', muCol, '-cMass']
massGir = ['-mass', muGir, '-cMass']
ops.node(0, 0.0, 0.0)
ops.node(1, 0.0, 2.0)
ops.node(2, 0.0, 4.0)
ops.node(3, 3.0, 4.0)
ops.node(4, 6.0, 4.0)
ops.node(5, 6.0, 2.0)
ops.node(6, 6.0, 0.0)
ops.fix(0, 1, 1, 1)
ops.fix(6, 1, 1, 0)
gTTag = 1
ops.geomTransf('Linear', gTTag)
# 1st column
ops.element('elasticBeamColumn', 1, 0, 1, Acol, E, IzCol, gTTag, *massCol)
ops.element('elasticBeamColumn', 2, 1, 2, Acol, E, IzCol, gTTag, *massCol)
# girder
ops.element('elasticBeamColumn', 3, 2, 3, Agir, E, IzGir, gTTag, *massGir)
ops.element('elasticBeamColumn', 4, 3, 4, Agir, E, IzGir, gTTag, *massGir)
# 2nd column
ops.element('elasticBeamColumn', 5, 4, 5, Acol, E, IzCol, gTTag, *massCol)
ops.element('elasticBeamColumn', 6, 5, 6, Acol, E, IzCol, gTTag, *massCol)
def test_Ex1aCanti2DEQmodif():
# SET UP ----------------------------------------------------------------------------
ops.wipe() # clear opensees model
ops.model('basic', '-ndm', 2, '-ndf', 3) # 2 dimensions, 3 dof per node
# file mkdir data # create data directory
# define GEOMETRY -------------------------------------------------------------
# nodal coordinates:
ops.node(1, 0., 0.) # node#, X Y
ops.node(2, 0., 432.)
# Single point constraints -- Boundary Conditions
ops.fix(1, 1, 1, 1) # node DX DY RZ
# nodal masses:
ops.mass(2, 5.18, 0., 0.) # node#, Mx My Mz, Mass=Weight/g.
# Define ELEMENTS -------------------------------------------------------------
# define geometric transformation: performs a linear geometric transformation of beam stiffness and resisting force from the basic system to the global-coordinate system
ops.geomTransf('Linear', 1) # associate a tag to transformation
# connectivity:
ops.element('elasticBeamColumn', 1, 1, 2, 3600.0, 3225.0, 1080000.0, 1)
# define GRAVITY -------------------------------------------------------------
ops.timeSeries('Linear', 1)
ops.pattern(
'Plain',
1,
1,
)
ops.load(2, 0., -2000., 0.) # node#, FX FY MZ -- superstructure-weight
ops.constraints('Plain') # how it handles boundary conditions
ops.numberer(
'Plain'
) # renumber dof's to minimize band-width (optimization), if you want to
ops.system(
'BandGeneral'
) # how to store and solve the system of equations in the analysis
ops.algorithm('Linear') # use Linear algorithm for linear analysis
ops.integrator(
'LoadControl', 0.1
) # determine the next time step for an analysis, # apply gravity in 10 steps
ops.analysis('Static') # define type of analysis static or transient
ops.analyze(10) # perform gravity analysis
ops.loadConst('-time', 0.0) # hold gravity constant and restart time
# DYNAMIC ground-motion analysis -------------------------------------------------------------
# create load pattern
G = 386.0
ops.timeSeries(
'Path', 2, '-dt', 0.005, '-filePath', 'A10000.dat', '-factor', G
) # define acceleration vector from file (dt=0.005 is associated with the input file gm)
ops.pattern(
'UniformExcitation', 2, 1, '-accel',
2) # define where and how (pattern tag, dof) acceleration is applied
# set damping based on first eigen mode
evals = ops.eigen('-fullGenLapack', 1)
freq = evals[0]**0.5
dampRatio = 0.02
ops.rayleigh(0., 0., 0., 2 * dampRatio / freq)
# display displacement shape of the column
# recorder display "Displaced shape" 10 10 500 500 -wipe
# prp 200. 50. 1
# vup 0 1 0
# vpn 0 0 1
# display 1 5 40
# create the analysis
ops.wipeAnalysis() # clear previously-define analysis parameters
ops.constraints('Plain') # how it handles boundary conditions
ops.numberer(
'Plain'
) # renumber dof's to minimize band-width (optimization), if you want to
ops.system(
'BandGeneral'
) # how to store and solve the system of equations in the analysis
ops.algorithm('Linear') # use Linear algorithm for linear analysis
ops.integrator('Newmark', 0.5,
0.25) # determine the next time step for an analysis
ops.analysis('Transient') # define type of analysis: time-dependent
ops.analyze(3995, 0.01) # apply 3995 0.01-sec time steps in analysis
u2 = ops.nodeDisp(2, 2)
print("u2 = ", u2)
assert abs(u2 + 0.07441860465116277579) < 1e-12
ops.wipe()
print("=========================================")
# fluid mesh
fluidTag = 4
ndf = 2
ops.mesh('line', 1, 10, 4, 5, 8, 9, 10, 11, 7, 6, 12, 2, wall_id, ndf, h)
ops.mesh('line', 2, 3, 2, 1, 4, wall_id, ndf, h)
ops.mesh('line', 3, 3, 2, 3, 4, water_bound_id, ndf, h)
eleArgs = ['PFEMElementBubble', rho, mu, b1, b2, thk, kappa]
ops.mesh('tri', fluidTag, 2, 2, 3, water_body_id, ndf, h, *eleArgs)
# wall mesh
wallTag = 5
ops.mesh('tri', wallTag, 2, 1, 2, wall_id, ndf, h)
for nd in ops.getNodeTags('-mesh', wallTag):
ops.fix(nd, 1, 1, 1)
# save the original modal
ops.record()
# create constraint object
ops.constraints('Plain')
# create numberer object
ops.numberer('Plain')
# create convergence test object
ops.test('PFEM', 1e-5, 1e-5, 1e-5, 1e-5, 1e-15, 1e-15, 20, 3, 1, 2)
# create algorithm object
ops.algorithm('Newton')
#g = 386.4 Mass = PCol / g MCol = ((Weight / LBeam) * math.pow(LBeam, 2)) / 12 # calculated geometry parameters ACol = HCol * BCol # cross-sectional area ABeam = HBeam * BBeam IzCol = (BCol * math.pow(HCol, 3)) / 12 # Column moment of inertia IzBeam = (BBeam * math.pow(HBeam, 3)) / 12 # Beam moment of inertia op.node(1, 0.0, 0.0) op.node(2, LBeam, 0.0) op.node(3, 0.0, LCol) op.node(4, LBeam, LCol) op.fix(1, 1, 1, 0) op.fix(2, 1, 1, 0) IDctrlNode = 2 IDctrlDOF = 1 op.mass(3, Mass, 0.0, 0.0) op.mass(4, Mass, 0.0, 0.0) ColSecTag = 1 # assign a tag number to the column section BeamSecTag = 2 # assign a tag number to the beam section coverCol = 6.0 * inch # Column cover to reinforcing steel NA. numBarsCol = 10 # number of longitudinal-reinforcement bars in column. (symmetric top & bot) barAreaCol = 2.25 * inch2 # area of longitudinal-reinforcement bars
# =============================================================================
# create fix
# =============================================================================
nodes_lvl_00 = frame_lvl_14.to_columns_nth(0)
# print(frame_lvl_14.to_columns_nth(0))
#
## fix(nodeTag, *constrValues)
fully_fixed = [1, 1, 1, 1, 1, 1]
for i in nodes_lvl_00:
# foundation = stu.node_manager.anti_get(i[1])
# print(i[1])
# print(foundation)
ops.fix(i[1], *fully_fixed)
# ops.fix(nodes_lvl_00[1][1] , *fully_fixed)
# fixZ(z, *constrValues, '-tol', tol=1e-10)
# ops.fixZ(0.0 , *fully_fixed)
print("\n已创建约束")
# =============================================================================
# create pattern
# =============================================================================
# pattern('Plain', patternTag, tsTag, '-fact', fact)
#
# factor = 1.0
# ops.timeSeries('Linear', 1)
# ops.pattern("Plain" , 1 , 1)
def run_nlth_analysis_on_sdof_ops_py(capacity_curve, gmr, damping,
degradation):
cap_df = pd.DataFrame(capacity_curve)
if any(cap_df.duplicated()):
warnings.warn(
"Warning: Duplicated pairs have been found in capacity curve!")
ops.wipe()
ops.model('basic', '-ndm', 1, '-ndf', 1)
d_cap = capacity_curve[:, 0]
f_cap = capacity_curve[:, 1] * 9.81
f_vec = np.zeros([5, 1])
d_vec = np.zeros([5, 1])
if len(f_cap) == 3:
#bilinear curve
f_vec[1] = f_cap[1]
f_vec[4] = f_cap[-1]
d_vec[1] = d_cap[1]
d_vec[4] = d_cap[-1]
d_vec[2] = d_vec[1] + (d_vec[4] - d_vec[1]) / 3
d_vec[3] = d_vec[1] + 2 * ((d_vec[4] - d_vec[1]) / 3)
f_vec[2] = np.interp(d_vec[2], d_cap, f_cap)
f_vec[3] = np.interp(d_vec[3], d_cap, f_cap)
elif len(f_cap) == 4:
f_vec[1] = f_cap[1]
f_vec[4] = f_cap[-1]
d_vec[1] = d_cap[1]
d_vec[4] = d_cap[-1]
f_vec[2] = f_cap[2]
d_vec[2] = d_cap[2]
d_vec[3] = np.mean([d_vec[2], d_vec[-1]])
f_vec[3] = np.interp(d_vec[3], d_cap, f_cap)
elif len(f_cap) == 5:
f_vec[1] = f_cap[1]
f_vec[4] = f_cap[-1]
d_vec[1] = d_cap[1]
d_vec[4] = d_cap[-1]
f_vec[2] = f_cap[2]
d_vec[2] = d_cap[2]
f_vec[3] = f_cap[3]
d_vec[3] = d_cap[3]
matTag_pinching = 10
if degradation == True:
matargs = [
f_vec[1, 0], d_vec[1, 0], f_vec[2, 0], d_vec[2, 0], f_vec[3, 0],
d_vec[3, 0], f_vec[4, 0], d_vec[4, 0], -1 * f_vec[1, 0],
-1 * d_vec[1, 0], -1 * f_vec[2, 0], -1 * d_vec[2, 0],
-1 * f_vec[3, 0], -1 * d_vec[3, 0], -1 * f_vec[4, 0],
-1 * d_vec[4, 0], 0.5, 0.25, 0.05, 0.5, 0.25, 0.05, 0, 0.1, 0, 0,
0.2, 0, 0.1, 0, 0, 0.2, 0, 0.4, 0, 0.4, 0.9, 10, 'energy'
]
else:
matargs = [
f_vec[1, 0], d_vec[1, 0], f_vec[2, 0], d_vec[2, 0], f_vec[3, 0],
d_vec[3, 0], f_vec[4, 0], d_vec[4, 0], -1 * f_vec[1, 0],
-1 * d_vec[1, 0], -1 * f_vec[2, 0], -1 * d_vec[2, 0],
-1 * f_vec[3, 0], -1 * d_vec[3, 0], -1 * f_vec[4, 0],
-1 * d_vec[4, 0], 0.5, 0.25, 0.05, 0.5, 0.25, 0.05, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 10, 'energy'
]
ops.uniaxialMaterial('Pinching4', matTag_pinching, *matargs)
matTag_minmax = int(matTag_pinching / 10)
ops.uniaxialMaterial('MinMax', matTag_minmax, matTag_pinching, '-min',
-1 * d_vec[4, 0], '-max', d_vec[4, 0])
mx = 1
kx = f_vec[1, 0] / d_vec[1, 0]
omega = np.sqrt(kx / mx)
dt = gmr[1, 0] - gmr[0, 0]
ops.node(1, 0)
ops.node(2, 0, '-mass', float(mx))
ops.fix(1, 1)
ops.element('zeroLength', 1, 1, 2, "-mat", matTag_minmax, "-dir", 1,
'-doRayleigh', 1)
gmr_values = gmr[:, 1] * 9.81
gmr_times = gmr[:, 0]
ops.timeSeries('Path', 2, '-values', *gmr_values, '-time', *gmr_times)
ops.pattern('UniformExcitation', 2, 1, '-accel', 2)
ops.constraints('Plain')
ops.numberer('RCM')
ops.test('NormDispIncr', 1e-6, 50)
ops.algorithm('Newton')
ops.system('BandGeneral')
ops.integrator('Newmark', 0.5, 0.25)
ops.analysis('Transient')
t_final = gmr[-1, 0]
t_current = ops.getTime()
ok = 0
#betaKinit=2*damping/omega
alphaM = 2 * damping * omega
time = [t_current]
disps = [0.0]
accels = [0.0]
#ops.rayleigh(0,0,betaKinit,0)
ops.rayleigh(alphaM, 0, 0, 0) # mass proportional damping
while ok == 0 and t_current < t_final:
ok = ops.analyze(1, dt)
if ok != 0:
print(
"regular newton failed ... lets try an initail stiffness for this step"
)
ops.test('NormDispIncr', 1.0e-6, 100, 0)
ops.algorithm('ModifiedNewton', '-initial')
ok = ops.analyze(1, dt)
if ok != 0:
print("reducing dt by 10")
ndt = dt / 10
ok = ops.analyze(10, ndt)
if ok == 0:
print("that worked ... back to regular settings")
ops.test('NormDispIncr', 1e-6, 50)
ops.test('NormDispIncr', 1e-6, 50)
t_current = ops.getTime()
time.append(t_current)
disps.append(ops.nodeDisp(2, 1))
accels.append(ops.nodeAccel(2, 1))
if ok != 0:
print('NLTHA did not converge!')
return time, disps, accels
# dl_data[floor:floor+wall.shape[0],6]= dl_data[floor:floor+wall.shape[0],1]
# floor = floor + wall.shape[0]
#
# for i in range(dl_data.shape[0]):
# ops.mass(dl_data[i,0], dl_data[i,1], dl_data[i,2], dl_data[i,3], dl_data[i,4], dl_data[i,5], dl_data[i,6])
#
# =============================================================================
# Set Boundary Condition
# =============================================================================
#1.node 2 to 6: 1=fixed, 0=free
constraint_data= np.ones((wall.shape[0],7))
constraint_data[:,0]= node_data[0:wall.shape[0],0]
for i in range(wall.shape[0]):
ops.fix(constraint_data[i,0], int(constraint_data[i,1]), int(constraint_data[i,2]), int(constraint_data[i,3]), int(constraint_data[i,4]), int(constraint_data[i,5]), int(constraint_data[i,6]))
#constraints for mass nodes
mass_constraint_data= np.ones((num_story,7))
mass_constraint_data[:,0]= mass_node_data[0:mass_node_data.shape[0],0]
mass_constraint_data[:,1:3]= 0
mass_constraint_data[:,6]= 1
for i in range(mass_constraint_data.shape[0]):
ops.fix(mass_constraint_data[i,0], 0,0,1,1,1,0)
# =============================================================================
# Apply Wall Constraints
# =============================================================================
def test_PlanarTrussExtra():
A = 10.0
E = 3000.
L = 200.0
alpha = 30.0
P = 200.0
sigmaYP = 60.0
pi = 2.0*asin(1.0)
alphaRad = alpha*pi/180.
cosA = cos(alphaRad)
sinA = sin(alphaRad)
# EXACT RESULTS per Popov
F1 = P/(2*cosA*cosA*cosA + 1)
F2 = F1*cosA*cosA
disp = -F1*L/(A*E)
b = 1.0
d = A
z = A
y = 1.0
numFiberY = 10 # note we only need so many to get the required accuracy on eigenvalue 1e-7!
numFiberZ = 1
# create the finite element model
for sectType in ['Fiber', 'Uniaxial']:
print(" - Linear (Example 2.14) sectType: ", sectType)
testOK = 0
ops.wipe()
ops.model( 'Basic', '-ndm', 2, '-ndf', 2)
dX = L*tan(alphaRad)
ops.node(1, 0.0, 0.0)
ops.node(2, dX , 0.0)
ops.node(3, 2.0*dX, 0.0)
ops.node(4, dX, -L )
ops.fix(1, 1, 1)
ops.fix(2, 1, 1)
ops.fix(3, 1, 1)
if sectType == "Uniaxial":
ops.uniaxialMaterial( 'Elastic', 1, A*E)
ops.section( 'Uniaxial', 1, 1, 'P')
else:
ops.uniaxialMaterial( 'Elastic', 1, E)
ops.section('Fiber', 1)
# patch rect 1 numFiberY numFiberZ [expr -z/2.0] [expr -y/2.0] [expr z/2.0] [expr y/2.0]
ops.patch( 'rect', 1, numFiberY, numFiberZ, -z, -y, 0., 0.)
ops.element('Truss', 1, 1, 4, 1)
ops.element('Truss', 2, 2, 4, 1)
ops.element('Truss', 3, 3, 4, 1)
ops.timeSeries( 'Linear', 1)
ops.pattern( 'Plain', 1, 1)
ops.load( 4, 0., -P)
ops.numberer( 'Plain')
ops.constraints( 'Plain')
ops.algorithm('Linear')
ops.system('ProfileSPD')
ops.integrator('LoadControl', 1.0)
ops.analysis('Static')
ops.analyze(1)
#
# print table of camparsion
#
comparisonResults = F2, F1, F2
print("\nElement Force Comparison:")
tol = 1.0e-6
print('{:>10}{:>15}{:>15}'.format('Element','OpenSees','Popov'))
for i in range(1,4):
exactResult = comparisonResults[i-1]
eleForce =ops.eleResponse( i, 'axialForce')
print('{:>10d}{:>15.4f}{:>15.4f}'.format(i, eleForce[0], exactResult))
if abs(eleForce[0]-exactResult) > tol:
testOK = -1
print("failed force-> ", abs(eleForce[0]-exactResult), " ", tol)
print("\nDisplacement Comparison:")
osDisp = ops.nodeDisp( 4, 2)
print('{:>10}{:>15.8f}{:>10}{:>15.8f}'.format('OpenSees:',osDisp,'Exact:', disp))
if abs(osDisp-disp) > tol:
testOK = -1
print("failed linear disp")
print("\n\n - NonLinear (Example2.23) sectType: ", sectType)
#EXACT
# Exact per Popov
PA = (sigmaYP*A) * (1.0+2*cosA*cosA*cosA)
dispA = PA/P*disp
PB = (sigmaYP*A) * (1.0+2*cosA)
dispB = dispA / (cosA*cosA)
# create the new finite element model for nonlinear case
# will apply failure loads and calculate displacements
ops.wipe()
ops.model('Basic', '-ndm', 2, '-ndf', 2)
ops.node( 1, 0.0, 0.0)
ops.node( 2, dX, 0.0)
ops.node( 3, 2.0*dX, 0.0)
ops.node( 4, dX, -L )
ops.fix( 1, 1, 1)
ops.fix( 2, 1, 1)
ops.fix( 3, 1, 1)
if sectType == "Uniaxial":
ops.uniaxialMaterial( 'ElasticPP', 1, A*E, sigmaYP/E)
ops.section( 'Uniaxial', 1, 1, 'P')
else:
ops.uniaxialMaterial( 'ElasticPP', 1, E, sigmaYP/E)
ops.section( 'Fiber', 1)
ops.patch( 'rect', 1, numFiberY, numFiberZ, -z/2.0, -y/2.0, z/2.0, y/2.0)
ops.element('Truss', 1, 1, 4, 1)
ops.element('Truss', 2, 2, 4, 1)
ops.element('Truss', 3, 3, 4, 1)
ops.timeSeries( 'Path', 1, '-dt', 1.0, '-values', 0.0, PA, PB, PB)
ops.pattern('Plain', 1, 1)
ops.load( 4, 0., -1.0)
ops.numberer('Plain')
ops.constraints('Plain')
ops.algorithm('Linear')
ops.system('ProfileSPD')
ops.integrator('LoadControl', 1.0)
ops.analysis('Static')
ops.analyze(1)
osDispA = ops.nodeDisp( 4, 2)
ops.analyze(1)
osDispB = ops.nodeDisp( 4, 2)
print("\nDisplacement Comparison:")
print("elastic limit state:")
osDisp = ops.nodeDisp( 4, 2)
print('{:>10}{:>15.8f}{:>10}{:>15.8f}'.format('OpenSees:',osDispA,'Exact:',dispA))
if abs(osDispA-dispA) > tol:
testOK = -1
print("failed nonlineaer elastic limit disp")
print("collapse limit state:")
print('{:>10}{:>15.8f}{:>10}{:>15.8f}'.format('OpenSees:',osDispB,'Exact:',dispB))
if abs(osDispB-dispB) > tol:
testOK = -1
print("failed nonlineaer collapse limit disp")
assert testOK == 0
ops.reset()
ops.wipe()
ops.logFile('output.log')
# set model
ops.start()
ops.model('basic', '-ndm', 3, '-ndf', 6)
ops.node(1, 0, 0, 0)
ops.node(2, 0, 1, 0)
ops.node(3, 1, 0, 0)
ops.node(4, 1, 1, 0)
ops.fix(1, 1, 1, 1, 0, 0, 0)
ops.fix(3, 1, 1, 1, 0, 0, 0)
ops.nDMaterial('PlaneStressUserMaterial', 3, 40, 7, 20.7e6, 2.07e6, -4.14e6,
-0.002, -0.005, 0.001, 0.08)
ops.nDMaterial('PlateFromPlaneStress', 30, 3, 1.25e10)
ops.section('LayeredShell', 1, 3, 30, 0.015, 30, 0.015, 30, 0.015)
# ops.uniaxialMaterial('Elastic', 1, 202.7e9)
# ops.element('Truss', 1, 1, 2, 0.1, 1)
ops.element('ShellMITC4', 1, 1, 3, 4, 2, 1)
ops.recorder('Node', '-file', 'disp.out', '-node', 2, '-time', '-dof', 1,
'disp')
ops.recorder('Node', '-file', 'reac.out', '-node', 2, '-time', '-dof', 1,
'reaction')
#this will create just 'Data' folder
#os.mkdir("Data-1b")
#detect the current working directory
#path1 = os.getcwd()
#print(path1)
h = 432.0
w = 504.0
op.node(1, 0.0, 0.0)
op.node(2, h, 0.0)
op.node(3, 0.0, w)
op.node(4, h, w)
op.fix(1, 1,1,1)
op.fix(2, 1,1,1)
op.fix(3, 0,0,0)
op.fix(4, 0,0,0)
op.mass(3, 5.18, 0.0, 0.0)
op.mass(4, 5.18, 0.0, 0.0)
op.geomTransf('Linear', 1)
A = 3600000000.0
E = 4227.0
Iz = 1080000.0
A1 = 5760000000.0
Iz1 = 4423680.0
op.element('elasticBeamColumn', 1, 1, 3, A, E, Iz, 1)