Rotations in a Seven Story Reinforced Concrete Hotel accompanying Nonlinear Waves During Earthquake Excitation

Gicev, Vlado and Trifunac, Mihailo (2007) Rotations in a Seven Story Reinforced Concrete Hotel accompanying Nonlinear Waves During Earthquake Excitation. In: 1st Workshop of Rotational Seismology, 17-20 Sep. 2007, Menlo Park, CA.

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Abstract

We model a seven-story, reinforced-concrete building in Van Nuys, California, that was damaged during the 1994 Northridge earthquake. We use a one-dimensional, layered, shear-beam model with bi-linear material properties, and we examine how the rotations (local strains and drifts) in this model depend upon the distribution of the stiffness along the building height, the nonlinear properties of the reinforced concrete, and the nature of strong motion. We show how, following the powerful waves propagating up and down the building, point rotations take place that differ from the corresponding average drift angles. These point rotations are larger near the rigid floor slabs (near the top and bottom ends of the columns, shear walls, and non-structural members found at all floors) and propagate as slow waves up and down the building. These slow rotational waves occur only while the material is experiencing large nonlinear deformations, and their amplitudes grow with ductility. We note that recording these rotational waves in real time may provide a powerful new vehicle for health monitoring of full-scale structures excited by large transient forces when their structural members enter large nonlinear deformations.

Item Type: Conference or Workshop Item (Paper)
Subjects: Engineering and Technology > Civil engineering
Natural sciences > Earth and related environmental sciences
Natural sciences > Matematics
Natural sciences > Physical sciences
Divisions: Faculty of Computer Science
Depositing User: Vlado Gicev
Date Deposited: 06 Nov 2012 13:52
Last Modified: 15 Aug 2013 11:08
URI: http://eprints.ugd.edu.mk/id/eprint/336

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