Determine the stiffness matrix K for the shown truss Determi
     Determine the stiffness matrix, K, for the shown truss.  Determine the Force Matrix Q and the Displacement Matrix D. Show the values of known elements.  Determine Q5, Q6, Q7, Q8, q5, q2, q5 and q4  Check your answer  Consider:  Support at 2 in Roller  Support at 4 is Pin  A = 0.0015 m^2  E = 200 Gpa D1 = -7.7778(10)^-6 m  D3 = 22.9688(10)^-6m  D5 = 15.1910(10)^-6 m   
  
  Solution
For the given configuration of a beam above, find the radius of a cross-section of the beam (assume it is circular) if maximum stress is []=200MPa

