Study on Damping Reduction Factor for Buildings under Earthquake Ground Motions

Lin, Yeou-Yih; Chang, Kuo‐Chun

doi:10.1061/(asce)0733-9445(2003)129:2(206)

Cited by 127 publications

(80 citation statements)

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“…Moreover, many expressions were given to this factor as a function of many parameters, damping only [3,4,[14][15][16], Damping and period [6,[17][18][19][20][21], or other parameters Duration, Soil conditions, Distance, Magnitude).…”

Section: Introductionmentioning

confidence: 99%

“…For instance, DCF "Damping Correction Factor" is used in [1][2][3][4], "Damping reduction factor" is used by [5][6][7][8][9], and several other researchers. "Damping modification factor" is used in [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…The model of Newmark and Hall is only applicable for ξ < 20% and for T in the range 0.125-10 sec. In Lin and Chang [6], a total of 1053 earthquake acceleration time histories from 102 earthquakes recorded in the United States of America. They concluded that the damping reduction factors are functions of the structural period and the damping ratio.…”

Section: Introductionmentioning

confidence: 99%

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Use of the Artificial Neural Networks to Estimate the DRF for Eurocode 8

Benahmed¹,

Hamoutenne²

2018

Period. Polytech. Civil Eng.

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The damping reduction factor (DRF) IntroductionIn the most seismic codes throughout the world, the response spectrum is given for a damping ratio ξ = 5%. Civil structures, however, may have different values of damping. As a result, the 5% response spectrum should be adjusted to other damping levels through a correction factor to evaluate the spectral response for any damping l.Different symbols are cited in the literature to identify this correction factor. For instance, DCF "Damping Correction Factor" is used in [1-4], "Damping reduction factor" is used by [5][6][7][8][9], and several other researchers. "Damping modification factor" is used in [10][11][12][13]. Other terminologies that have seen in the literature include: damping adjustment factor, response spectrum amplification factor, and the damping scaling factor. In this study, we adopt the term Damping Reduction Factor (DRF).This factor has been studied by a number of researchers. Moreover, many expressions were given to this factor as a function of many parameters, damping only [3,4,[14][15][16], Damping and period [6,[17][18][19][20][21], or other parameters Duration, Soil conditions, Distance, Magnitude).One of the first systematic methods, for adjusting 5%-damped spectra to other levels of damping, was the pioneer work of Newmark and Hall [22] where their results inspired many seismic codes and Norms. It was based on only 28 records from 9 earthquakes prior to 1973. This work is the basis for most U.S. building codes. They divided their results of damping reduction factors into three parts: the acceleration-, velocity-, and displacement-sensitive regions, respectively. The model of Newmark and Hall is only applicable for ξ < 20% and for T in the range 0.125-10 sec. In Lin and Chang [6], a total of 1053 earthquake acceleration time histories from 102 earthquakes recorded in the United States of America. They concluded that the damping reduction factors are functions of the structural period and the damping ratio. Its applicability is ξ -2-50 % and T 0.01-10 sec.Hatzigeorgiou [12] in his paper proposed a new method to estimate DRF of SDOF systems on the basis of empirical expressions obtained after extensive parametric studies. The influence of viscous damping ratio, period of vibration, soil type conditions and ground motion type (natural near-and

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Use of the Artificial Neural Networks to Estimate the DRF for Eurocode 8

Benahmed¹,

Hamoutenne²

2018

Period. Polytech. Civil Eng.

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“…The study concluded that the use of strength reduction factors based on ductility, period, and soil conditions, together with the estimation of structural over strength factors and relationships between local and global ductility demands, is required to establish rational seismic design approaches. Lin and Chang [4] subjected 102 earthquake records to linear elastic single degree-of-freedom (SDOF) systems with damping ratios between 2% and 50% and with periods ranging from 0.01 s to 10 s to develop a formula for a period-dependent damping factor.…”

Section: Introductionmentioning

confidence: 99%

Response Modification Factors for Reinforced Concrete Structures Equipped with Viscous Damper Devices

Abdi

Hejazi

Jaafar

et al. 2017

Period. Polytech. Civil Eng.

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The response modification factor is one of the seismic design parameters that determine the nonlinear performance of building structures during strong earthquakes. Most IntroductionThe response modification factor is one of the main parameters in seismic construction design. Equivalent static analysis is the technique for evaluating the seismic response of structures. This technique can be implemented by determining the response modification factor. Current structural design codes focus on complete safety and sturdiness even during earthquakes. However, such endeavor is impossible to achieve. Nevertheless, certain structural and nonstructural damages can be studied to economically achieve a high level of life safety in structural design by applying an inelastic energy dissipation system. The designed lateral strength of structures must be kept within the elastic range according to seismic codes. Hence, the designed lateral strength is usually lower than the required lateral strength. Maintaining the inelastic range of a structure means that all the structural and nonstructural members of this structure that are subjected to lateral motion are assured to return to their initial state without permanent deformations and damages. Preserving this state is far from being feasible and rational in many cases. On the contrary, going beyond the elastic frontier in an earthquake event may lead to the yielding and cracking of structural members, which can lead to catastrophic results unless these inelastic actions are limited to a certain degree. Thus, inelastic behavior definitely decreases overall construction costs by reducing member sizes and thus reducing materials and construction time. It also facilitates operability and construction.According to the International Building Code [1], a response modification coefficient (R), including the effect of inelastic deformations, must be applied to evaluate the design of the seismic forces of structures that have been reduced and to evaluate the deflection amplification factor (Cd) for converting elastic lateral displacements to total lateral displacements. The values of the R factor and Cdset in the IBC [1] are based on observations of the performance of different structural systems in previous strong earthquakes, on technical justification, and on tradition [2]. The R coefficient is proposed to explain ductility, over strength, and energy dissipation through the soil foundation system [2].

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“…DRF has been studied by many researchers and different expressions of DRF, as function of damping ratio [2][3][4][5], damping ratio and period [6][7][8][9][10][11], damping ratio, period and other earthquake characteristics (e.g. duration, soil conditions, epicentral distance, magnitude) [7,[12][13][14][15][16], have been proposed.…”

Section: Introductionmentioning

confidence: 99%