Question 9.2: Figure 9.34 shows the members and idealised support conditio...
Figure 9.34 shows the members and idealised support conditions for a roof truss. All three members of which are steel and have the same cross-sectional area such that AE = 12 MN throughout. Using the displacement based finite element method, treating the truss as a pin-jointed plane frame and each member as a rod:
(a) assemble the necessary terms in the structural stiffness matrix;
(b) hence, determine the nodal displacements with respect to the global coordinates, for the condition shown in Fig. 9.34.
(c) If, under load, the left support sinks by 5 mm, determine the resulting new nodal displacements, with respect to the global coordinates.
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