Results 251 to 260 of about 4,853 (302)

On the modal damping ratios of shear-type structures equipped with Rayleigh damping systems

Journal of Sound and Vibration, 2006
Abstract The effects of added manufactured viscous dampers upon shear-type structures are analytically investigated here for the class of Rayleigh damping systems. The definitions of mass proportional damping (MPD) and stiffness proportional damping (SPD) systems are briefly recalled and their physical counterpart is derived.
TROMBETTI, TOMASO, SILVESTRI, STEFANO
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Identification of modal damping ratios of structures with closely spaced modal frequencies

Structural Engineering and Mechanics, 2002
This paper explores the possibility of using a combination of the empirical mode decomposition (EMD) and the Hilbert transform (HT), termed the Hilbert-Huang transform (HHT) method, to identify the modal damping ratios of the structure with closely spaced modal frequencies.
You-Lin Xu
exaly   +2 more sources

Evaluation of natural periods and modal damping ratios for seismic design of building structures

Earthquake Spectra, 2020
A comprehensive technique for identification of modal properties (i.e. natural periods and equivalent modal damping ratios) of building structures is presented. The proposed identification technique employs a combination of multiple system identification methods; it utilizes the benefits and suppresses the shortcomings of each method to provide a ...
Farzad Naeim, Farzin Zareian
exaly   +2 more sources

On the modal damping ratios of mixed reinforced concrete – steel buildings

Soil Dynamics and Earthquake Engineering
George A Papagiannopoulos
exaly   +2 more sources

The Determination of Modal Damping Ratios From Maximum Entropy Spectral Estimates

Journal of Dynamic Systems, Measurement, and Control, 1982
This paper focusses on the estimation of natural frequencies and modal damping ratios from measured response spectra, with particular emphasis on the dynamic response of offshore structures to wind and wave excitation. At present, estimates of natural frequencies and damping ratios are computed from the location and half-power bandwidths of resonant ...
Campbell, R. B., Vandiver, J. K.
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An Explicit Solution of Modal-Damping Ratios for Higher Modes of a Cable with an External Damper

Journal of Engineering Mechanics, 2022
AbstractDesign of external dampers for stay cables requires repetitive evaluation of damping ratios for target modes of cables under various damper parameters and installation positions, and explic...
Chao Yang, Zhengqing Chen, Xugang Hua, Xianfang Li, Wenxi Wang   +4 more
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Evaluation of Absolute Damping from Modal Damping Ratios

2004
In the previous chapters, we determined the natural frequencies and modal shapes for undamped structures when modeled as shear buildings. We also determined the response of these structures using the modal superposition method. In this method, as we have seen, the differential equations of motion are uncoupled by means of a transformation of ...
Mario Paz, William Leigh
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Equivalent modal damping ratios for concrete/steel mixed structures

Computers & Structures, 2010
The present work deals with the dynamic response of elastic multi-degree of freedom structures that are irregular in height, consisting of two parts, a lower part made of concrete and an upper part, made of steel. Irregularity is due to different dynamic response characteristics of the two parts, here expressed by their different damping ratios.
A.V. Papageorgiou, C.J. Gantes
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