Interstory drifts of multi-story buildings under random earthquake excitations

Publication Type:
Journal Article
Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2010, 224 (3), pp. 603 - 614
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Interstory drifts of multi-story buildings with interval parameters subjected to stationary or non-stationary earthquake excitations are investigated. A multi-story building is modelled as a shear beam structure. The uncertainties of structural mass, stiffness, and damping are described by interval variables. Using the interval factor method, an interval structural parameter can be expressed as the product of its midpoint value and interval factor. Structural natural frequencies, power spectral density, and mean-square value of seismic random interstory drifts can then be expressed as the functions of interval factors of the structural parameters. The computational expressions for the lower bound, midpoint, upper bound, maximum width, and interval change ratio of the structural random interstory drifts are derived by means of the interval operations. The effects of the uncertainties of the structural parameters on the random responses of an eight-story building are investigated and discussed in detail.
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