Journal ArticleDOI
Time and amplitude dependent response of structures
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In this article, the authors present a summary of observations of dynamic behaviour which were made on two typical modern buildings during a period of about ten years, and the data presented should prove useful for calibration of parameters in theoretical non-linear models.Abstract:
SUMMARY An understanding of the precise nature of the non -linear response of structures is essential for future improvement of earthquake resistant design procedures. This paper presents a summary of observations of dynamic behaviour which were made on two typical modern buildings during a period of about ten years. These structures underwent numerous tests and experienced three strong earthquake ground motions . The data presented should prove useful for calibration of parameters in theoretical non-linear models. For buildings having an apparent soft -spring-type non -linearity, a partial or complete recovery of the structural stiffness appears to occur following the large strains created by strong ground shaking . The rate and extent of this recovery appear to depend strongly on the strain levels throughout the excitation.read more
Citations
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Journal ArticleDOI
Extracting the Building Response Using Seismic Interferometry: Theory and Application to the Millikan Library in Pasadena, California
Roel Snieder,Erdal Safak +1 more
TL;DR: In this article, the authors separate the building response from the excitation and the ground coupling by deconvolving the motion recorded at different levels in the building and apply this to recordings of the motion in the Robert A. Millikan Library in Pasadena, California.
Journal ArticleDOI
The Observed Wander of the Natural Frequencies in a Structure
TL;DR: The Southern California Seismic Network (scsn) has recently installed seismic stations in two buildings on the Caltech campus (Millikan Library and the Broad Center) and continuous real-time accelerometer data from these structures are now freely available to the community as mentioned in this paper.
Journal ArticleDOI
Period formulas for concrete shear wall buildings
Rakesh K. Goel,Anil K. Chopra +1 more
TL;DR: In this paper, it is shown that current code formulas for estimating the fundamental period of concrete shear wall buildings are grossly inadequate and an improved formula is developed by calibrating a theoretical formula, derived using Dunkerley's method, against the measured period data through regression analysis.
Journal ArticleDOI
A wavelet-based approach for the identification of linear time-varying dynamical systems
Roger Ghanem,Francesco Romeo +1 more
TL;DR: In this article, a novel procedure is developed for the identification of linear discrete models of dynamical systems from noisy data based on a representation of the governing differential equations with respect to a wavelet basis, and the formulation of an inverse algebraic problem in the associated subspace.
Journal ArticleDOI
Apparent Periods of a Building. II: Time-Frequency Analysis
Mihailo D. Trifunac,Mihailo D. Trifunac,S.S. Ivanović,S.S. Ivanović,Maria I. Todorovska,Maria I. Todorovska +5 more
TL;DR: In this paper, the analysis of the apparent frequency of a seven-story reinforced-concrete hotel building in Van Nuys, Calif., is extended to consider its time-dependent changes, both short and long term.
References
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Journal ArticleDOI
Comparisons between ambient and forced vibration experiments
TL;DR: In this article, the authors compared the effect of unwanted modes on the response near resonance of the mode being sought and showed that the mode amplitudes determined by ambient and forced vibration tests show systematic departure for high modes and near the top levels of buildings tested.
Journal ArticleDOI
Determination of the natural periods of buildings
R. Crawford,H. S. Ward +1 more
TL;DR: In this article, the first three modes of vibration of a nineteen-story building about the two major translational axes and the torsional axis of the building were determined by random wind excitation.
Journal ArticleDOI
Vibration and soil-structure interaction tests of a nine-story reinforced concrete building
TL;DR: The Millikan Library Building, a nine-story reinforced concrete shear-wall structure at the California Institute of Technology, was tested dynamically by means of two eccentric mass vibration generators located on the ninth floor.
Journal ArticleDOI
Wind-induced vibrations and building modes
H. S. Ward,R. Crawford +1 more
TL;DR: In this paper, a simple theoretical model was used to calculate the frequencies of vibration of the buildings; the model was based on the assumption that there was no joint rotation in the building frames.
DissertationDOI
Vibration tests of a multistory building
TL;DR: In this paper, a 9-story reinforced concrete building with a basement was used to investigate its dynamical characteristics, by exciting the building with 2 vibration generators installed on its 9th floor.