A Measure of Drift Demand for Earthquake Ground Motions Based on Timoshenko Beam Model

Abstract eng:
A new measure of demands for earthquake ground motion is presented. It is base on a continuous Timoshenko beam model. While considering the effect of nonuniform distribution of drift demands along the building height and taking into account the coupling effect of bending and shear distortion on the vibration of cantilever beam structures, the drift spectrum leads to more accurate estimations of drift demand for earthquake ground motions. This continuous model is compared with the combined flexural-shear beam model proposed by Miranda. Similar to the model proposed by Miranda, the dynamic properties of the cantilever Timoshenko beam model are highly influenced by a parameter called the height-width ratio. A formula is given to indicate the relation of height-width ratio with lateral stiffness ratio. The effects of height-width ratio, damping and higher modes on drift demands are examined.

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