As I read about behavior of tall buildings that these are less activated by short period waves that means strata is rock but what I saw at the end of vedio is full of contrast with what I know. Please sir clarify me.
Well, that is why we need to look at period dependent excitations. A building does not have just a single mode of vibrations which is typically what is assumed behind the statements that you just stated. A tall building has a significantly large number of modes of vibrations which can get excited on the basis of resonance and how dynamic amplification changes with these change in frequencies of excitation. It may not show very high roof displacement demands which again is assumed in codes, but it can show very high racking forces which can significantly damage diaphragms as well as impose large rotational demands on coupling beams as well as shear demands in structural walls. I hope this clarifies your doubts.
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great information with clarity. Could you kindly tell which software have you used to simulate this kind of animation ?
Hello Gaurav, this building response was recorded in PERFORM 3D while evaluating the building for NLTHA.
Where did you get these time histories? The spectra plots are exactly the ones I produced for a high rise project at Wood. Are you one of our clients?
As I read about behavior of tall buildings that these are less activated by short period waves that means strata is rock but what I saw at the end of vedio is full of contrast with what I know.
Please sir clarify me.
Well, that is why we need to look at period dependent excitations. A building does not have just a single mode of vibrations which is typically what is assumed behind the statements that you just stated. A tall building has a significantly large number of modes of vibrations which can get excited on the basis of resonance and how dynamic amplification changes with these change in frequencies of excitation. It may not show very high roof displacement demands which again is assumed in codes, but it can show very high racking forces which can significantly damage diaphragms as well as impose large rotational demands on coupling beams as well as shear demands in structural walls. I hope this clarifies your doubts.
@@StructuralMadness
Thanks sir for your valuable revert.✌️