Determining structural periods of buildings:-
The period of an undamped mass supported on a spring is equal to 2 .pie sq.rt of M/K
A useful approximation for buildings with a regular distribution of mass and stiffness is
T is approximately equal to 2.sq.rt of delta(seconds)
where delta is the lateral deflection in metres of the top of the building when subjected to its gravity loads acting horizontally;
period depends on the square root of mass divided by stiffnesses, so large changes in mass and stiffness are needed for a significant change in period. By contrast mounting the building on flexible bearings can dramatically increase the period.
As a rough initial guide, the fundamental period of
a building is N=10.
iamk,
A useful approximation for buildings with a regular distribution of mass and stiffness is
T is approximately equal to 2.sq.rt of delta(seconds)
where delta is the lateral deflection in metres of the top of the building when subjected to its gravity loads acting horizontally;
period depends on the square root of mass divided by stiffnesses, so large changes in mass and stiffness are needed for a significant change in period. By contrast mounting the building on flexible bearings can dramatically increase the period.
As a rough initial guide, the fundamental period of
a building is N=10.
iamk,
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