Response spectral damping modification factors for structures built on soft soils

Dávalos, Héctor; Miranda, Eduardo; Bantis, James; Cruz, Cristian

doi:10.1016/j.soildyn.2022.107153

Cited by 7 publications

(9 citation statements)

References 35 publications

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“…A 5% damping ratio is generally used for concrete structures and this ratio can vary depending upon many factors such as structure types, energy dissipation devices in buildings, changes in building heights and etc. [1][2][3][4][5]. High-rise buildings may have lower damping ratios whereas low-rise buildings have generally larger values.…”

Section: Introductionmentioning

confidence: 99%

“…High-rise buildings may have lower damping ratios whereas low-rise buildings have generally larger values. The damping ratio values decrease as the height of the building increases [4][5][6] and the estimation of the seismic response of tall buildings requires the damping ratio to be known [7]. In the seismic design of buildings in the United States, the damping ratio value is commonly recommended as lower than 2.5% for buildings higher than 150 m [7].…”

Section: Introductionmentioning

confidence: 99%

“…These spectra define the maximum responses of SDOF systems for specific ground motions. In widespread engineering applications, the most common method to define the seismic design loads that will affect an engineering structure is via the use of pseudo-acceleration spectral ordinates [5], and for this reason, the design acceleration spectra are described in many codes and regulations. In national and international seismic design codes, 5%-damped earthquake design spectra are usually generated for a specific territory using data on past earthquake ground motions.…”

Section: Introductionmentioning

confidence: 99%

“…For structural systems having damping ratios different than 5%, damping modification factors (DMFs) have been defined to estimate the seismic demands. These factors have been developed to make the conversion between a 5%-damped system and the other system having various damping ratios [5,9]. The study to define DMF was first conducted by Newmark and Hall [10] and this pioneering study pointed out that these factors depend upon the natural vibration period of the system [5].…”

Section: Introductionmentioning

confidence: 99%

“…These factors have been developed to make the conversion between a 5%-damped system and the other system having various damping ratios [5,9]. The study to define DMF was first conducted by Newmark and Hall [10] and this pioneering study pointed out that these factors depend upon the natural vibration period of the system [5]. After Newmark and Hall's research, their relationship was adopted in ATC-40 [11] and FEMA 273 [12], [9].…”

Section: Introductionmentioning

confidence: 99%

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An Investigation of Damping Modification Factors Corresponding to Different Damping Ratios for Sdof Systems

Çelik

Merter

2023

CEJ

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The damping ratio is an important parameter in dynamic analyses and plays a key role in the design of building structures. Elastic response spectra are widely used in this design to describe the earthquake action in specific site classes. 5% damped response spectra are generally used for most of the conventional structures. However, other types of structures may not have a damping ratio of 5% and can have much lower or much larger damping ratios. The damping ratio is recommended at about 5% for concrete structures whereas it is estimated at 2% for steel structures. Tall slender buildings may have much lower damping ratios and low-rise buildings may be designed using much larger damping ratios than 5%. For these types of buildings, elastic response spectra are modified to account for different levels of damping ratios. This study proposes the damping modification factors (DMFs) which are computed using 5% response spectra as the benchmark. A strong ground motion set has been selected for the stiff site class and the displacement, pseudo-velocity, and pseudo-acceleration response spectra have been computed for single-degree-of-freedom (SDOF) systems. DMFs have been obtained in terms of these spectra and 3%, 10%, 20%, and 30% damping ratios have been considered. Variations of DMFs with different damping ratios have been obtained graphically. It can be seen from the results that DMFs are sensitive to the vibration period of the SDOF system.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An Investigation of Damping Modification Factors Corresponding to Different Damping Ratios for Sdof Systems

Çelik

Merter

2023

CEJ

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Framework for Regional Seismic Risk Assessments of Groups of Tall Buildings

Bantis,

Heresi,

Poulos

et al. 2024

Earthq Engng Struct Dyn

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A novel probabilistic Monte Carlo‐based framework to conduct regional seismic risk assessments using simplified continuous models is proposed. The hazard at rock outcrop is defined by response spectral ordinates, which are simulated to account for spatial correlation and correlation across different periods simultaneously. For sites on firm and soft soils, a simplified site response analysis using a one‐dimensional continuous non‐uniform shear beam model is used to transform the hazard at rock outcrops to the hazard at all sites of interest. Uncertainty in the soil properties at each site is explicitly considered. Response spectra at each site are computed at the principal orientations of each building using recently proposed directionality models that permit the estimation of the seismic hazard at specific orientations. A one‐dimensional continuous coupled shear‐flexural beam model is used to simulate building dynamic properties accounting for modeling uncertainty and to obtain building responses for each building. The parameters of each model only require information on the building height and the lateral resisting system. All relevant uncertainties associated with each module of the framework are explicitly incorporated and propagated. Finally, a case study of tall buildings in San Francisco subjected to a magnitude 7.0 earthquake on the Hayward Fault is presented to illustrate how the framework can be implemented.

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Damping modification factor of the vertical response spectrum

Elhout

2022

Asian J Civ Eng

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Response spectral damping modification factors for structures built on soft soils

Cited by 7 publications

References 35 publications

An Investigation of Damping Modification Factors Corresponding to Different Damping Ratios for Sdof Systems

An Investigation of Damping Modification Factors Corresponding to Different Damping Ratios for Sdof Systems

Framework for Regional Seismic Risk Assessments of Groups of Tall Buildings

Damping modification factor of the vertical response spectrum

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