New Seismic Intensity Parameters for Rotational Components

Abstract eng:
Seismic intensity parameters reflect the destructive potential of the strong ground motions and are commonly considered as the primary tools in seismic risk assessment and earthquake-resistant design of structures. During sixty years ago, a large number of intensity parameters have been proposed in order to characterize the inherent features of the earthquake translational components. The numerical results of recent research studies have illustrated that the rocking and torsional components may also have detrimental effect on the seismic behavior of structures and their influence should be included in seismic design codes. However, no intensity parameter has been currently introduced to measure the destructive effect of earthquake rotational components on the structures. The rotational components can be evaluated in terms of spatial derivatives of their corresponding translational ground motions and, hence, are highly correlated to the translational components. In the present study, the earthquake rotational motions are simulated considering the effects of both time delay and loss of coherency. Using the mathematical relationship between the translational and rotational components, new seismic intensity parameters for application to the rotational ground motions are derived. These intensity parameters are corresponding to the widely used intensity parameters for characterizing the earthquake translational components, i.e. peak ground acceleration, Nau and Hall indices, first-mode pseudo-spectral acceleration and Housner spectrum intensity.

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