First Mode Damping Ratios for Buildings

Bernal, Dionisio; Döhler, Michael; Mozaffari, Salma; Kwan, Kenny; Liu, Yang

doi:10.1193/101812eqs311m

Cited by 64 publications

(30 citation statements)

References 15 publications

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“…Even after omitting this cycle, tests of non-precracked specimens suggest an energy dissipation before yielding corresponding to a mean viscous damping ratio of 8.4% (8.4% in rectangular beams/columns, 11.2% in walls, 6.7% in circular columns), almost regardless the amplitude (Figure 2A). This value agrees well with predictions for one-story RC buildings 34 but exceeds the value of 5% in code elastic spectra, the values recommended in Pacific Earthquake Engineering Research Center 35 for nonlinear response history analysis, or those that suit the measured low-amplitude response in RC buildings with energy dissipation sources not included in the model 36 or derived from the dynamic response of slender walls 37 or from cyclic tests of beams. 38 So, great caution is needed in using the average value of 8.4%.…”

Section: Hysteretic Energy Dissipation In Cyclic Tests Of Rc Memberssupporting

confidence: 81%

Energy dissipation models for RC members and structures

Grammatikou

Fardis

Biskinis

2018

Earthq Engng Struct Dyn

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Summary The unloading parameters of hysteretic models for RC members are given in terms of their shear‐span‐to‐depth ratio and the viscous damping used to model other energy dissipation sources. They reflect the energy dissipation in full post‐yield load cycles in 534 tests of rectangular or circular members. Pre‐yield hysteretic energy dissipation—ignored if the model is elastic till yielding—amounts in the tests to a mean viscous damping around 8.5% and can be considered in nonlinear response‐history analysis through a new model which combines constant elastic stiffness in virgin loading with hysteretic energy dissipation both before and after yielding. Models with linear behavior till yielding and hysteretic energy dissipation only after it come closer to the results of the new model if viscous damping is 5%.

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Section: Hysteretic Energy Dissipation In Cyclic Tests Of Rc Memberssupporting

confidence: 81%

Energy dissipation models for RC members and structures

Grammatikou

Fardis

Biskinis

2018

Earthq Engng Struct Dyn

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“…In general, viscous damping ratios are spread over a relatively wide range (0.5-9.0%) depending on the material (steel vs. reinforced concrete) and height of the building (e.g. [40,38,4]). Estimates of viscous damping ratio are also sensitive to the system identification algorithm utilized in the analysis, as well as the type and level of excitation used as an input (i.e.…”

Section: Input Parametersmentioning

confidence: 99%

Effects of wave passage on torsional response of symmetric buildings subjected to near-fault pulse-like ground motions

Cao

Meza-Fajardo

Mavroeidis

et al. 2016

Soil Dynamics and Earthquake Engineering

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a b s t r a c tThis article investigates the effects of wave passage on the torsional response of elastic buildings in the near-fault region. The model of the soil-foundation-structure system is a symmetric cylinder placed on a rigid circular foundation supported on an elastic halfspace. The idealized model is subjected to obliquely incident plane SH waves simulating the action of near-fault pulse-like motions. The response of the structure is assessed in terms of the relative twist between the top and the base of the superstructure. A parametric analysis of the maximum relative twist as a function of the input parameters of the seismic excitation and soil-foundation-structure system is performed to identify the parameters that control the torsional response of buildings due to wave passage in the near-fault region. It is shown that the torsional response is most sensitive to a key parameter of the near-fault ground motion referred to as "pulse period". Specifically, large rotations are observed when the pulse period is close to the torsional period of the structure. It is also demonstrated that the wave passage effects are controlled by the wave apparent velocity, rather than the local site conditions. Furthermore, broadband near-fault ground motions from three hypothetical earthquakes of different magnitude are generated, and the torsional responses due to the simplified pulse-like and broadband ground motions are compared against each other. The results show that the simplified pulse model that describes the coherent seismic radiation is able to represent the main features of the near-fault ground motions that cause large torsional response. The maximum relative twist at resonance is found to be − 10 3 rad, a value that is consistent with the upper bound of rotations in structures reported in the literature.

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“…Implicit integral expressions were derived to evaluate the Fisher information of linear multidegree of freedom (MDOF) systems with mass and (or) stiffness proportional damping. More recent developments on the subject of uncertainty quantification of identified modal parameters have been reported in [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

A lower bound for the variance of frequency and damping ratio identified from noisy vibration measurements

Hernández

Polanco

2015

Struct. Control Health Monit.

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SUMMARYThis paper derives exact expressions to compute the lowest achievable variance by any unbiased estimator of modal frequency and damping ratio from free vibration and forced vibration signals contaminated by additive zero-mean Gaussian white noise. These limits are found through the Cramer-Rao lower bound theory. The paper presents simulated system identification results that confirm the applicability of the derived expressions. Copyright

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First Mode Damping Ratios for Buildings

Cited by 64 publications

References 15 publications

Energy dissipation models for RC members and structures

Energy dissipation models for RC members and structures

Effects of wave passage on torsional response of symmetric buildings subjected to near-fault pulse-like ground motions

A lower bound for the variance of frequency and damping ratio identified from noisy vibration measurements

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