The following content explains the procedure for
- identifying the unknown joint displacements /kinematic indeterminacy/Degree of Freedom (DOFs)
- writing slope deflection equations (SDEs) for each member
- substituting the fixed end moments (due to span loading) in SDEs
- substituting known joint displacements in each SDE
- writing the joint equilibrium equations for each joint having a DOF
- Substituting SDEs in joint equilibrium equations
- Solving the joint equilibrium equations simulateously for unknown joint displacements
- Substituting the joint displacements in SDEs to evaluate the member end moments
- Drawing the deflected shape and BMD for the frame
Problem 1
Analysis of portal frame "with sway" using Slope deflection method
Exercise Problems:
Ex.1
The UDL on the beam BC is 28 kN/m.
Answer for above problem is: MAB=5.83 kN-m, MBA=10.07 kN-m, MBC=-10.07 kN-m, MCB=8.9 kN-m, MCD=-8.9 kN-m, MDC=-3.04 kNm
Ex.2
Answer for above problem is: MAB=-35.08 kN-m, MBA=-20.92 kN-m, MBC=20.92 kN-m, MCB=52.92 kN-m, MCD=-52.92 kN-m, MDC=-51.08 kNm
Ex.3
Answer for above problem is: MAB=-28.03 kN-m, MBA=7.02 kN-m, MBC=-7.02 kN-m, MCB=31.64kN-m, MCD=-31.64 kN-m, MDC=-27.36 kNm Ex.4
Answer for above problem is: MAB=-16.727 kN-m, MBA=5.091 kN-m, MBC=-5.091 kN-m, MCB=24.364 kN-m, MCD=-24.364 kN-m, MDC=0 kNm
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