Column stiffness is affected by column directions if the long direction is with earthquake direction or is not what is the effect of distribution of columns directions?
Hello
Your questions appear to be related to the influence of seismic demand on stiffness of columns (instead of story height). Since the seismic waves are always skewed so seismic demand on building will be different in both lateral direction. The seismic demand depend on the spectral region in which the fundamental natural time period of the building fall (i.e.. displacement or velocity or acceleration sensitive regions). If the building is high rise (fall in displacement sensitive region) then the seismic demand decrease with the increase in natural time period (or decrease in stiffness ) of building
DIrection of a rectangular column affects the I-value along a certain direction. The value of I then affects the lateral stiffness so is the natural frequency of a high rise building. Obvioiusly, the building would have different response when the column section is deployed in different way under the same earthquake event.
In general, for high rise buildings the resistance to overturning moment and lateral deflection caused by lateral forces always require additional cross-sectional area of members over and above required for strength requirements for gravity loads alone. Buildings should be designed in both directions independently for the critical forces of wind or earthquake separately. The total shear force and the moment at the base result from seismic analysis when loads acting normal to the short side may be greater than the other direction. Buildings should be designed in both directions independently for the critical forces of wind or earthquake separately. The total shear force and the moment at the base result from seismic analysis when loads acting normal to the short side may be greater than the other direction.
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