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Question 2: Stiffness Method in Structural Analysis. Calculate the moment at the fixed end support for the 2 span continuous beam structure as shown in Figure Q2 below using stiffness method. (Hint: Use superposition of fixed end and nodal load structure.) The continuous beam is fixed end supported at joint A. It is roller supported at joint B and C A point load of 80 kN is acting on member AB, 6 m from joint A. A uniform load of 24 kN/m is acting on member BC Elastic modulus E and moment of inertia I are the same for all members. Denotes member Denotes D OF.1 Figure Q2 a) Calculate the fixed end moments FEMAB FEMBA FEMBc, FEMcB5 marks) b) Assemble the structure stiffness matrix [K] based on the DOF designation as shown in Fig.Q2. (5 marks) c)Solve the stiffness matrix equation Q KD for the joint rotations DI and D2 at joints B & C in terms (5 marks) of EI for the nodal load structure. d) Solve the stiffness equation [QJ [KD] for the fixed end moment at joint A due to joint rotations DI and D2 for the nodal load structure (5 marks) e) Calculate the total moment at joint A, moment MBa and MBc of the structure as shown in Fig.Q2. (5 marks)
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a) Fited end moments BC 12- Io3d lo Lo 3 10 stffesc 102 o 102 le 10 LO l o-0.012-006 0.024 อ -0.012 0.0G 8, c) reaction maik forYeaction mat*of £ 32 24x10 lo 20O 120 -200 80x6 115.2 - |S2 -115.2.t20D

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