BACK STAY EFFECT- TOWER WITH PODIUM AT BASE
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In many places you might have seen tall towers connected to a structure at its base with greater plan area and couple of stories; we often call that part of the structure as Podium level.
When the tower deplaces laterally the podium at the base try to resist that lateral movement, specially the the top floor of the podium. The tower also no less, no less in trying to move the podium… that lateral force from the structural elements of the towers transfers to the podium elements through diaphragm effect and cause increase in stresses in the structural elements of the podium that leads to extensive cracking.
That’s why the podium elements, specially the top floor of the podium (diaphragm) is supposed to be cheked for initial and ultimate cracking conditions. The initail stage (more stiffness) will increase the strength demans in the tower elements conneted to podium and the ultimate cracking condition (less stiffness) will possess critical strength deman in the podium elements.
That’s why you would have seen that the IS16700: 2023 has suggested two different levels of stiffness modifiers for which the podium analysis should be performed and the most critical one should be considered for design.
The top floor of the podium, also called as the Back Stay floor. The phenomena is called as Back Stay effect.
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