Example 4.6 Pg.No.106

In [19]:
from __future__ import division
import math

sum_FAFlBL=1263.6*10**6    # (N.mm)
sum_FAFlDL=880*10**6       # (N.mm)
E=200000                  # young's modulus (N/mm^2)
A=1800                    # area of each member (mm^2)

#eqn 4.23 We=Wi
del_B=sum_FAFlBL/A/E
print "\ndeflection at point B =%2.2f mm\n"%(del_B)

del_D=sum_FAFlDL/A/E
print "deflection at point D =%2.2f mm\n"%(del_D)

deflection at point B =3.51 mm

deflection at point D =2.44 mm
In [18]:
from __future__ import division
import math

ext_load=30    #external load(kN)

#eqn 30*4*del_vB/3=F_BA*del_vB
F_BA=ext_load*4/3
print "\nforce in the struss AB is = %3.2f kN\n"%(F_BA)

force in the struss AB is = 40.00 kN
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