Abstract
Effects of wind force on the system identification of buildings with small vibrations caused by ground motion (microtremors) were studied. The limit ratio of wind force to inertia force by ground motion beyond which wind force considerably affects amplification and damping ratios obtained from transfer functions was studied using a 2-particle model with two independent inputs. The following results were obtained: limit ratios of wind force can be expressed by empirical formulas with the stiffness ratio and damping ratio of the building; results generated using these empirical formulas agree with observation results; and the effect of wind force can be estimated by the product of amplification and damping ratios obtained from transfer functions.
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