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Forced Vibration Testing and Analytical Modeling of a Four-Story Reinforced Concrete Frame Building

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Abstract

A series of force vibration test and ambient vibration measurement was performed on a four-story reinforced concrete building, which was damaged prior to the test due to the shaking during the 1994 Northridge earthquake. A unique dataset of low noise, high-density spatial resolution was produced: Broadband low-amplitude vibrations under the linear shaker excitation were collected for efficient identification of modal properties of the building. During high-amplitude vibrations obtained by synchronized operation of two large capacity eccentric mass shakers, local behaviors of some structural members (curvature distribution of floor slab and columns) as well as global structural response (interstory drift and acceleration response) were monitored. In addition to the forced vibration data, ambient vibrations were measured before and after each test, to monitor any drift of modal properties resulting from the forced vibrations. Detailed system identification analyses as well as investigation of local behavior were conducted using collected data for accurate characterization of the building properties. A FE model updating procedure using both Frequency response data and modal data was constructed. To enhance the numerical stability and convergence, absolute and relative constraints as well as weighting factors were added to the least-squares solution procedure. A FE model for the test building, capable of reproducing experimental results accurately and consistent with observed building damage, was obtained using implemented updating procedure. A testing method to induce seismic excitations that are consistent with earthquake induced shaking at the structure base was proposed. This testing method uses linear shaker for simulation, and addressed two challenges associated with implementation in the context of linear elastic seismic response for structures. These challenges were (a) identifying a linear shaker input motion which produces a structural response simil

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Researchers should cite this work as follows:

  • Eunjong Yu (2013), "Forced Vibration Testing and Analytical Modeling of a Four-Story Reinforced Concrete Frame Building," http://nees.org/resources/6814.

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