Correlation between seismic parameters of far-fault motions and damage indices of low-rise reinforced concrete frames

Cao, Vui Van; Ronagh, Hamid Reza

doi:10.1016/j.soildyn.2014.06.020

Cited by 68 publications

(24 citation statements)

References 22 publications

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“…[31] Housner spectral intensity (called SI hereafter) exhibits more desirable correlation with structural response than peak ground acceleration and spectral acceleration, S a . [32] Then, SI is selected as earthquake intensity measure, which is defined as the area under pseudo-velocity response spectrum, S v (T, ξ), between 0.1 and 2.5 s, [33] that is, TABLE 5 Selected ground motions from PEER database [28] ID no. Station PEER's file names PGA (g) M Note.…”

Section: Seismic Fragility Curvesmentioning

confidence: 99%

Collapse safety margin and seismic loss assessment of RC frames with equal material cost

Wang

Zhang

2017

Structural Design Tall Build

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SummaryWith the premise of equal material cost, a collapse safety margin-based collapse resistance optimization strategy for passively controlled reinforced concrete (RC) frames is proposed based on seismic fragility analysis, collapse safety margin analysis, and seismic hazard loss assessment.The efficiency of introducing buckling restrained braces or lead-rubber bearings on the performance of RC frames is studied by so-called collapse margin ratio (CMR) suggested by FEMA P695 and the modified rigidity-to-gravity ratio (RGR). The proposed strategy is developed from the case study on 4 low-rise and medium-rise RC frames and then verified on a high-rise RC frame. The study indicates that lead-rubber bearings can cause a significant improvement at all damage levels. The contribution of buckling restrained braces to structural stiffness and collapse resistance can be maximized when they are located in potential weak stories determined through inelastic time history analysis. CMR exhibits a better linear relation with the minimum modified RGR. Increasing the equivalent story lateral stiffness and the minimum modified RGR simultaneously can give rise to a significant improvement in seismic capacity, especially CMR. Base isolation is proved to be desirable not only for improving the collapse safety margin of RC frames significantly but also for reducing seismic hazard loss. KEYWORDSbuckling restrained brace, collapse safety margin, equal material cost, lead-rubber bearing, optimization, seismic loss 1 | INTRODUCTION Earthquake-induced damage or even collapse in building structures can cause substantial economic loss or even casualties. As is well-known, earthquakes are typically rare and random probabilistic events. It is much of importance for building structures, especially for essential buildings, for example, hospitals, tall buildings, and communication center to possess adequate collapse resistance in case of these accidental events.[1]As one of quantified indexes for structural collapse resistance, the collapse margin ratio (called CMR hereafter) suggested in the Federal Emergency Management Agency (FEMA) P695 report [2] can quantify the relative margin between the performance of structures under rare-level earthquakes and that of structures under earthquakes causing the probability of collapse of 50%. CMR is determined based on collapse fragility analysis that arises from the incremental dynamic analysis method. [3] CMR is dependent on many factors, for example, structural height, component span, strength deterioration, stiffness degradation, and uncertainty of ground motions. Some investigations have been carried out in this aspect. [4][5][6] Liel et al. [7] compared the collapse safety margin of ductile structures and nonductile structures. They observed that ductile structures would be able to resist stronger earthquake because they can experience substantial inelastic deformation before collapse. Manie et al. [8] used CMR to assess the collapse safety margin of low-rise plan-asymmetric with different plan e...

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Section: Seismic Fragility Curvesmentioning

confidence: 99%

Collapse safety margin and seismic loss assessment of RC frames with equal material cost

Wang

Zhang

2017

Structural Design Tall Build

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“…e impacts of near-field and far-field ground motions on civil engineering structures have been studied in several past researches [20][21][22][23][24]. For the same ductility factor, the near-field ground motions inflict a greater strength demand than the far-field motions for SDF (single degree of freedom) systems [19].…”

Section: Introductionmentioning

confidence: 99%

Effect of Soil Classification on Seismic Behavior of SMFs considering Soil‐Structure Interaction and Near‐Field Earthquakes

Shahbazi¹,

Mansouri

et al. 2018

Shock and Vibration

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Seismic response of a structure is affected by its dynamic properties and soil flexibility does not have an impact on it when the bottom soil of foundation is supposedly frigid, and the soil flexibility is also ignored. Hence, utilizing the results obtained through fixed-base buildings can lead to having an insecure design. Being close to the source of an earthquake production causes the majority of earthquake’s energy to reach the structure as a long-period pulse. Therefore, near-field earthquakes produce many seismic needs so that they force the structure to dissipate output energy by relatively large displacements. Hence, in this paper, the seismic response of 5- and 8-story steel buildings equipped with special moment frames (SMFs) which have been designed based on type-II and III soils (according to the seismic code of Iran-Standard 2800) has been studied. The effects of soil-structure interaction and modeling of the panel zone were considered in all of the two structures. In order to model radiation damping and prevent the reflection of outward propagating dilatational and shear waves back into the model, the vertical and horizontal Lysmer–Kuhlemeyer dashpots as seen in the figures are adopted in the free-field boundary of soil. The selected near- and far-field records were used in the nonlinear time-history analysis, and structure response was compared in both states. The results obtained from the analysis showed that the values for the shear force, displacement, column axial force, and column moment force on type-III soil are greater than the corresponding values on type-II soil; however, it cannot be discussed for drift in general.

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“…DI has been increasingly accepted as a powerful tool for quantitative evaluation of structural damage caused by earthquakes. In seismic regions, damage indices have a fundamental role in decision-making about retro t [5].…”

Section: Introductionmentioning

confidence: 99%

“…In addition to the value of the deformation or energy response, the number of load cycles plays an important role in the range of damage [7,8]. Therefore, in estimating the damage of structures under earthquake excitations, cumulative damage models are superior to non-cumulative ones [5]. Banon and Veneziano [9] introduced a DI using the ratio of the sum of inelastic rotations during half cycles to the yield rotation.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the ratio of maximum plastic deformation to plastic deformation capacity was used as another parameter in determining the damage measure [13]. Hysteretic energy that merges the amount of response into the number of load cycles is a potential parameter for expressing structural damage [5,8]. Fajfar [14] and Padilla and Rodriguez [15] introduced the ratio of the hysteretic energy demand to the absorbed energy capacity of a structure under monotonic loading to estimate damage.…”

Section: Introductionmentioning

confidence: 99%

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Bayesian updating of the Park-Ang damage index for RC frame buildings under near-fault ground motions

Yazdannejad

Yazdani

2017

Scientia Iranica

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Abstract. A procedure for updating the Park-Ang damage index of reinforced concrete building under near-fault ground motion is proposed. Rather than developing a new damage model, a correction term is added to the existing damage model within the Bayesian framework. The correction term is described as a linear function of the variation of sti ness of structures, which is a more consistent indicator of predicting the level of damage. The Bayesian method is an e ective approach when new data become available. The reinforced concrete building damage data during past near-fault pulse-like earthquakes were used in updating the damage model. The proposed damage index is conceptually simple and realistic.

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Correlation between seismic parameters of far-fault motions and damage indices of low-rise reinforced concrete frames

Cited by 68 publications

References 22 publications

Collapse safety margin and seismic loss assessment of RC frames with equal material cost

Collapse safety margin and seismic loss assessment of RC frames with equal material cost

Effect of Soil Classification on Seismic Behavior of SMFs considering Soil‐Structure Interaction and Near‐Field Earthquakes

Bayesian updating of the Park-Ang damage index for RC frame buildings under near-fault ground motions

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