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# -*- coding: utf-8 -*-
"""
Created on Mon Dec 24 16:45:24 2018
@author: admin
"""
import os
while True:
ratio = input("enter aspect ratio (default: 0.5, warning possion ratio zero)...\n")
if not ratio:
ratio = 0.5
break
else:
try:
ratio = float(ratio)
if not (ratio <= 1.0 and ratio >= 0):
raise Exception
break
except:
print("input error, try again...")
print("Modeling...")
E = 35e3 # GPa
h = 5 # mm
miu = 0 # possion ratio
Bc = (E*h**3)/(12.0*(1.0-miu**2))
f_pressure = 1e-4 # N/mm^2
L = 1000
W = L*ratio
l = L if (Lelse W
element_num_X = 50
delta_X = L / element_num_X
element_num_Y = 50
delta_Y = W / element_num_Y
ele_area = L*W/(element_num_X*element_num_Y)
# collection of all generated nodes
nodes = []
for j in range(element_num_Y+1):
coor_y = j*delta_Y
for i in range(element_num_X+1):
coor_x = i*delta_X
nodes.append((coor_x,coor_y))
# collection of xy coordinates for drawing mesh
nodes_x = [n[0] for n in nodes]
nodes_y = [n[1] for n in nodes]
# collection of middle, sides, vertex nodes
# nodes_mid_index, one items
# nodes_vertex_indexs, four items
# nodes_left_indexs
# nodes_right_indexs
# nodes_bottom_indexs
# nodes_top_indexs
nodes_mid_index = None
for n in nodes:
if n == (L/2,W/2):
nodes_mid_index = nodes.index(n)
break
nodes_vertex_indexs = []
for n in nodes:
if n == (0,0) or n == (L,0) or n == (L,W) or n == (0,W):
nodes_vertex_indexs.append(nodes.index(n))
def delete_vertex_nodes(nodes_list):
temp = set(nodes_list).difference(set(nodes_vertex_indexs))
temp_list = list(temp)
temp_list.sort()
return temp_list
nodes_left_indexs = []
for n in nodes:
if n[0] == 0:
nodes_left_indexs.append(nodes.index(n))
nodes_left_indexs = delete_vertex_nodes(nodes_left_indexs)
nodes_right_indexs = []
for n in nodes:
if n[0] == L:
nodes_right_indexs.append(nodes.index(n))
nodes_right_indexs = delete_vertex_nodes(nodes_right_indexs)
nodes_bottom_indexs = []
for n in nodes:
if n[1] == 0:
nodes_bottom_indexs.append(nodes.index(n))
nodes_bottom_indexs = delete_vertex_nodes(nodes_bottom_indexs)
nodes_top_indexs = []
for n in nodes:
if n[1] == W:
nodes_top_indexs.append(nodes.index(n))
nodes_top_indexs = delete_vertex_nodes(nodes_top_indexs)
# collection of element connectivity
elements = []
elements_has_mid_point = []
ele_index = 0
for j in range(element_num_Y):
for i in range(element_num_X):
index1 = ele_index + j
index2 = index1 + 1
index3 = index2 + element_num_X + 1
index4 = index3 - 1
elements.append((index1,index2,index3,index4))
ele_index += 1
if nodes_mid_index in (index1,index2,index3,index4):
elements_has_mid_point.append((index1,index2,index3,index4))
# now, lets turn to OpenSees
tcl_file = open('./output/co.tcl','wt')
tcl_file.write('wipe\n')
#tcl_file.write('puts "System"\n')
tcl_file.write('model basic -ndm 3 -ndf 6\n')
#tcl_file.write('puts "Nodes"\n')
for n in nodes:
tcl_file.write('node %d %f %f 0.0\n' % (nodes.index(n)+1,n[0],n[1]))
#tcl_file.write('puts "Constraints"\n')
for n_index in set.union(set(nodes_vertex_indexs),set(nodes_left_indexs),set(nodes_right_indexs),set(nodes_bottom_indexs),set(nodes_top_indexs)):
tcl_file.write('fix %d 1 1 1 1 1 1\n' % (n_index+1))
#tcl_file.write('puts "Material"\n')
tcl_file.write('nDMaterial ElasticIsotropic 1 %f %f\n' % (E,miu))
tcl_file.write('nDMaterial PlateFiber 601 1\n')
tcl_file.write('section PlateFiber 701 601 %f\n' % h)
#tcl_file.write('puts "Shell elements"\n')
for n_indexs in elements:
n_indexs1 = [n_indexs[i]+1 for i in range(len(n_indexs))]
tcl_file.write('element ShellMITC4 %d %d %d %d %d 701\n' % (elements.index(n_indexs)+1,*n_indexs1))
#tcl_file.write('puts "recorder"\n')
tcl_file.write('recorder Node -file ./output/node_mid.out -node %d -dof 3 disp\n' % nodes_mid_index)
elements_has_mid_point_indexs_inOpenSees = []
for ele in elements_has_mid_point:
elements_has_mid_point_indexs_inOpenSees.append(elements.index(ele)+1)
tcl_file.write('recorder Element -file ./output/Element.out -ele %d %d %d %d forces\n' % tuple(elements_has_mid_point_indexs_inOpenSees))
#tcl_file.write('puts "loading"\n')
tcl_file.write('pattern Plain 1 Linear {\n')
nodes_side_indexs = set.union(set(nodes_left_indexs),set(nodes_right_indexs),set(nodes_bottom_indexs),set(nodes_top_indexs))
nodes_inner_indexs = set(range(len(nodes))).difference(
set.union(set(nodes_vertex_indexs),nodes_side_indexs)
)
for n_index in nodes_inner_indexs:
tcl_file.write('load %d 0.0 0.0 %f 0.0 0.0 0.0\n' % (n_index+1,f_pressure*ele_area))
for n_index in nodes_side_indexs:
tcl_file.write('load %d 0.0 0.0 %f 0.0 0.0 0.0\n' % (n_index+1,f_pressure*ele_area/2))
tcl_file.write('}\n')
tcl_file.write('puts "Analysing..."\n')
tcl_file.write("""constraints Plain
numberer Plain
system BandGeneral
test EnergyIncr 1.0e-6 200
algorithm Newton
integrator LoadControl 1.0
analysis Static
analyze 1
puts "Analysis complete..." """)
tcl_file.close()
print("Modeling complete...")
if __name__ == '__main__':
print("="*80)
os.popen(".\\bin\\OpenSees.exe .\\output\\co.tcl",buffering=1).close()
print("="*80)
with open('./output/node_mid.out','tr') as file:
data = file.read()
deflection = float(data)
xishu = deflection*Bc/(f_pressure*l**4)
with open('./output/Element.out','tr') as file:
data = file.read()
forces = data.split()
b1 = [float(i) for i in forces[12:18]]
b2 = [float(i) for i in forces[42:48]]
b3 = [float(i) for i in forces[54:60]]
Mx, My = abs(b1[3] + b2[3]),abs(b1[4] + b3[4])
xishu_Mx = Mx/(f_pressure*l**2)/delta_X
xishu_My = My/(f_pressure*l**2)/delta_Y
print("f:%.6f Mx:%.6f My:%.6f" % (xishu,xishu_Mx,xishu_My))
os.system("pause")
|
加载中…
(2018-12-28 12:59:40)