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Equivalent modal damping ratios for concrete/steel mixed structures
Computers & Structures, 2010The 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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Parametric studies on bending stiffness and damping ratio of Sandwich structures
Additive Manufacturing, 2018Sandwich structures are extensively used in aviation industries to reduce the overall weight of the system. Although the mechanical behavior of these structures has been widely studied, the performance of core shape in vibration response has been ...
R. Rajpal, Lijesh K.P., Gangadharan KV
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Earthquake Engineering & Structural Dynamics
Targeting the great demand for adding non‐structural elevators to old residential buildings, this article proposes an updated configuration of tuned mass damper inerter (U‐TMDI) applied in external non‐structural elevators.
Meng Wang +4 more
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Targeting the great demand for adding non‐structural elevators to old residential buildings, this article proposes an updated configuration of tuned mass damper inerter (U‐TMDI) applied in external non‐structural elevators.
Meng Wang +4 more
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Composite structures, 2018
Auxetic materials and structures as a class of metamaterials have been extensively studied and evaluated for many applications. This paper focuses on the fabrication and vibration damping of the carbon fiber composite auxetic double-arrow corrugated ...
Li Ma +6 more
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Auxetic materials and structures as a class of metamaterials have been extensively studied and evaluated for many applications. This paper focuses on the fabrication and vibration damping of the carbon fiber composite auxetic double-arrow corrugated ...
Li Ma +6 more
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Computational prediction of modal damping ratios in thin-walled structures
Journal of Sound and Vibration, 2014Abstract Modal analysis in finite element packages gives natural frequencies and mode shapes, but not modal damping values. Given a constitutive relation for specific material dissipation, volume integrals of the per cycle dissipation can be used to estimate the modal damping. Here, we adopt a well known power law model for such specific dissipation.
Prasun Jana, Anindya Chatterjee
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Empirical Modeling of Modal Damping Ratio of Impact-Damped Flexible Beams by GEP
Arabian Journal for Science and Engineering, 2017In this paper, the empirical models for predicting the modal damping ratio ( $$\xi )$$ of impact-damped flexible beams (IDFB) via gene expression programming (GEP) are proposed. The experimental data used in
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Evaluation of natural periods and modal damping ratios for seismic design of building structures
Earthquake Spectra, 2020A 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 ...
Yijun Xiang +2 more
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Modal truncation, Ritz vectors, and derivatives of closed-loop damping ratios
Journal of Guidance, Control, and Dynamics, 1991The effect of modal truncation on the damping ratio and their derivatives with respect to an added mass is investigated for a simply supported, multispan beam with a linear quadratic Gaussian control system. It is found that both the damping ratios and derivatives converge slowly, but the derivatives converge more slowly than the damping ratios ...
Chris A. Sandridge, Raphael T. Haftka
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Structural Engineering and Mechanics, 2014
Over the past years, hybrid building systems, consisting of reinforced concrete frames in bottom and steel frames in top are used as a cost-effective alternative to traditional structural steel or reinforced concrete constructions. Dynamic analysis of hybrid structures is usually a complex procedure due to various dynamic characteristics of each part ...
Abbas Sivandi-Pour +2 more
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Over the past years, hybrid building systems, consisting of reinforced concrete frames in bottom and steel frames in top are used as a cost-effective alternative to traditional structural steel or reinforced concrete constructions. Dynamic analysis of hybrid structures is usually a complex procedure due to various dynamic characteristics of each part ...
Abbas Sivandi-Pour +2 more
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Frequencies and damping ratios of bridges through Operational Modal Analysis using smartphones
Construction and Building Materials, 2018Abstract Seismic Force Assessment in structural design of bridges requires a good estimation of the fundamental period. Estimated periods, using current methodologies in seismic provisions, are approximations that may significantly differ from the real periods.
Sebastián Castellanos-Toro +4 more
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