The figure below is a floor plan of a six story residential building located in downtown Philadelphia. It is a reinforced concrete frame building with 6 in concrete floor slab. Superimposed dead load is 15 psf. Floor height is 12 ft.
(A) Perform gravity load analysis to determine
A.1- the uniformly distributed dead and live load on the intermediate beam ABC in a typical floor.
A.2- Using approximate method of analysis, determine beam maximum moment and shear for 1.2 D + 1.6 L load combination. Ignore beam self-weight.
A.3- Maximum axial load at the base of the intermediate column B. Assume roof load is equal to floor load and use 1.2 D + 1.6 L load combination. Ignore self-weight of beams and columns.
(B) Perform lateral load analysis under wind/earthquake load to determine :
B.1- Base shear force due to external wind and earthquake load in the E-W direction. Determine which load controls the design.
B.2- For the critical lateral load determine the factor of safety against overturning in the N-S direction using 0.9 D + (1.0 W or 1.0 E - whichever is greater) load combination. No internal wind pressure.
B.3- Using approximate method of analysis of frames, determine maximum axial load, shear and moment at the base of column B under lateral wind or earthquake load (whichever is greater) in the E-W direction. For load distribution assume rigid diaphragm action and that the stiffness of the intermediate frame is double the stiffness of the end frames.
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