Seismic response of RC buildings subjected to fling‐step in the near‐fault region

Hamidi, Hamed; Karbassi, Amin; Lestuzzi, Pierino

doi:10.1002/suco.201900028

Cited by 20 publications

(6 citation statements)

References 34 publications

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“…What matters here is the kind of earthquake loading characteristics. Characters of strong ground motions (GMs) may considerably vary in terms of source mechanism, rupture propagation, frequency contents, energy, etc., [26]. Strong ground motions in the vicinity of causative fault can cause severe structural demands because of exerting high input energy in a short duration [27].…”

Section: Earthquake Ground Motionsmentioning

confidence: 99%

On Seismic Response Reduction of Adjacent Frame: Emphasis on the Different Characteristics of Earthquakes

2021

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Seismic response reduction of adjacent frames with the use of dampers, base isolations, or hybrid controls has been considered in recent years. What makes this to be highly important are the different properties of input earthquake loadings that can lead to different results. In this study, friction dampers and LRB isolators were used as the passive energy absorbers and, accordingly, the performance of such devices subjected to a wide range of earthquake loadings has been studied. Two experimental samples were considered to be used as model verifications. Afterward, the frames were excited by three sets of far-fault, near-fault, and near-fault with pulse records, and then the seismic responses of the frames were evaluated in the forms of displacement, inter-story drift, and acceleration. Subsequently, efficient techniques for implementing passive control devices were proposed. The results showed that the hybrid control strategy (a combination of devices) is the most efficient technique for all three statuses; however, using the base-isolation technique can also lead to acceptable performance. When the height of the frame increases, the role of the damper in the reduction of inter-story drift decreases. Nevertheless, the maximum displacement caused by near-fault with pulse records in the base isolation deceives is the main concern in using such devices. The rate of reduction of structural drift in near-fault with pulse records by using hybrid control was significant so that in 3-, 5-, and 8-story frames this reduction was 77%, 85%, and 87%, respectively.

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Section: Earthquake Ground Motionsmentioning

confidence: 99%

On Seismic Response Reduction of Adjacent Frame: Emphasis on the Different Characteristics of Earthquakes

2021

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“…Despite displacement‐based damage indices, the energy damage index can play a significant role in long‐duration and pulsive ground motions. For example, sequential ground motions such as mainshock–aftershock and near‐field earthquakes 29–37 . The total input energy of the system is determined as the total energy demand produced by earthquake ground motions.…”

Section: Introductionmentioning

confidence: 99%

“…For example, sequential ground motions such as mainshock-aftershock and near-field earthquakes. [29][30][31][32][33][34][35][36][37] The total input energy of the system is determined as the total energy demand produced by earthquake ground motions. According to the energy balance equation, some part of the input energy is stored in the form of kinematic and strain energy, and the other ones are dissipated in the form of damping and hysteretic energy.…”

mentioning

confidence: 99%

Improvement of energy damage index bounds for circular reinforced concrete bridge piers under dynamic analysis

Amirchoupani

Abdollahzadeh

Hamidi

2021

Structural Concrete

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An improvement of energy damage index bounds for circular reinforced concrete (RC) bridge piers under dynamic time history analysis is presented in this study. The energy-based damage model has been defined as a ratio of hysteresis dissipation energy to input energy for performance evaluation of circular RC bridge pier systems. Based on the energy balance equation, the mentioned damage model can consider all energy aspects, including kinematic energy, strain energy, hysteresis energy, damping energy, and input energy. Additionally, the effect of ground motion duration, amplitude, and frequency content is appropriately considered in this damage model. For this purpose, the damage limit state bounds for two empirical RC bridge piers are statistically evaluated under the 22 far-field ground motion sets of FEMA-P695 for simulation of strong-earthquake motion and consideration of record-to-record variability.First of all, appropriate validation between empirical and numerical fiber element models is implemented to estimate accurate results. Then, damage data at each performance level through strain limit states are collected by developing energy incremental dynamic analysis curves. Statistical results on collected damage data are presented in all performance levels to determine damage index bounds by the convolution of fragility curve distribution. Hence, five damage index bounds at five performance-level are suggested, including very slight, slight, moderate, extensive, and complete damage. Finally, the effect of the other damping ratios on the modified energy damage model is carried out by using the beta coefficient in the formula. In the end, the modified energy damage model is compared with other damage indices to investigate the efficiency of the proposed damage model.

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“…Impulsive signals can increase the damage of structures and infrastructure located in near fault regions; this has been evidenced after many earthquakes and analyzed in various studies [5][6][7][8][9][10][11][12][13][14][15]. Research on the effects of impulsive ground motion on engineered structures is quite well developed; a short, non-exhaustive review, that can be used as a starting point for further research studies, points out works concerning different structural typologies, namely: seismically base-isolated structures [16][17][18][19][20], bridges [21][22][23][24][25], reinforce concrete or steel moment designed structures [5,[26][27][28][29], and low-and mid-rise masonry buildings [30]. In Italy, extensive damage occurred mainly where the structures were old and built without engineering design; such situations occur commonly in historical centers and heritage buildings, such as churches and bell towers; anyhow, the damage was also recognized in buildings with engineering design.…”

Section: Introductionmentioning

confidence: 99%

Impulsive Signals Produced by Earthquakes in Italy and Their Potential Relation with Site Effects and Structural Damage

et al. 2021

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Near fault seismic records may contain impulsive motions in velocity-time history. The seismic records can be identified as impulsive and non-impulsive depending on the features that their waveforms have. These motions can be an indicator of directivity or fling step effect, and they may cause dangerous effects on structures; for this reason, there is increasing attention on this subject in the last years. In this study, we collect the major earthquakes in Italy, with a magnitude large or equal to Mw 5.0, and identify the impulsive motions recorded by seismic stations. We correlate impulsive motions with directivity and fling step effects. We find that most earthquakes produced impulsive signals due to the directivity effect, though those at close stations to the 30 October 2016 Amatrice earthquake might be generated by the fling step effect. Starting from the analyzed impulses, we discuss on the potential influence of site effects on impulsive signals and suggest a characterization based on the main displacement directions of the impulsive horizontal displacements. Finally, we discuss on the damage of three churches in Emilia, which were subject to impulsive ground motion, underlying in a qualitative way, how the characteristics of the pulses may have had influences the structural response of the façades.

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Seismic response of RC buildings subjected to fling‐step in the near‐fault region

Cited by 20 publications

References 34 publications

On Seismic Response Reduction of Adjacent Frame: Emphasis on the Different Characteristics of Earthquakes

On Seismic Response Reduction of Adjacent Frame: Emphasis on the Different Characteristics of Earthquakes

Improvement of energy damage index bounds for circular reinforced concrete bridge piers under dynamic analysis

Impulsive Signals Produced by Earthquakes in Italy and Their Potential Relation with Site Effects and Structural Damage

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