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Why Longitudinal Reinforcement is larger in upper story than bottom story.
UmarMakhzumi reacted to Badar (BAZ) for a topic
If you will follow detailing of ACI then the foundation will provide rotational restraint. Modeling it with the pin is under-conservative. Column's longitudinal reinforcement is a function of the size of the cross-section, material strengths, axial force and bending moments. Compare them.1 point -
Why Longitudinal Reinforcement is larger in upper story than bottom story.
UmarMakhzumi reacted to Badar (BAZ) for a topic
Look at the design forces of members and compare, you will get the answer. Why are you modeling the foundation as the pin?1 point -
Diaphragms
UmarMakhzumi reacted to Badar (BAZ) for a topic
You will assignment diaphragm property to your joints when you are not modeling area elements ( shells, plates or membrane) in the model, but the joints are connected by a horizontal area-member, or some combination of line-members, that will act as a diaphragm in the actual structure. ETABS will use it to distribute lateral forces to all joints based on that diaphragm property.1 point
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