(b) Generate an envelope case that includes the three load combinations above and plot the shear and moment envelopes. (a) Plot the moment and shear diagrams for each individual factored load combination listed above. To model cracked sections, enter 'section modifiers' by using the 'modify/show properties' of elements within the section properties menu.
This is approximately done by reducing the moment of inertia in the 3-3 direction (for a 2D structure) by a factor less than 1.0 in the section modifiers section in SAP2000 (use 0.35 for beams and 0.70 for columns as the modification factors).
Structural analysis of reinforced concrete structures has to include the effect of concrete cracking on the results (moment, shear, etc.).
Note that the frame is subjected to uniformly distributed dead and live loads ( q D and q L ) in addition to wind loads applied at each floor (left to right). (50 pts) Analyze the frame shown below using SAP 2000 for the following factored load combinations taken from the ACI 318-19 Building Code.
