Characterization of the Dynamic Response of Structures to Damaging Pulse-type Near-fault Ground Motions

Mollaioli, Fabrizio; Bruno, Silvia; Decanini, Luis D.; Panza, G. F.

doi:10.1007/s11012-005-7965-y

Cited by 45 publications

(27 citation statements)

References 26 publications

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“…Within this framework, it is worth highlighting that existing equivalent linear models for bilinear oscillators were developed without considering explicitly pulse-like near-fault ground motions, which seismological characteristics are different from the properties typically observed in case of far-field seismic events. In fact, several strong motion records obtained in recent earthquakes at sites close to the seismic causative fault exhibited a noticeable variability in the damage potential [8][9][10]. The reasons of this variability are the proximity of the source and the occurrence of forward directivity effects.…”

Section: Introductionmentioning

confidence: 99%

Accuracy of Equivalent Linear Models for Bilinear Oscillators Under Pulse-Like Ground Motion

Quaranta¹,

Mollaioli²

2017

Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Abstract. Nonlinear dynamic analysis is the most reliable approach for the assessment of structures under earthquake, provided that implemented computational method and adopted mechanical models are able to simulate properly material and geometrical nonlinearities. Nonetheless, several guidelines and codes also strive to include simplified methodologies for use in practice. In this perspective, several equivalent linear models have been proposed so far in order to allow a rapid analysis of oscillators with bilinear-type response, but none of the existing studies has yet examined systematically their reliability in case of pulse-like ground motion. Therefore, this paper presents the results of an extensive numerical investigation that aims at assessing whether existing equivalent linear models can be exploited in order to estimate the maximum displacement of bilinear oscillators under pulse-like near-fault ground motion. Several nonlinear dynamic analyses have been performed and final results demonstrate that the accuracy of current equivalent linear models depends on the ratio between the elastic period of the bilinear oscillator and the pulse period of the seismic excitation.

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Section: Introductionmentioning

confidence: 99%

Accuracy of Equivalent Linear Models for Bilinear Oscillators Under Pulse-Like Ground Motion

Quaranta¹,

Mollaioli²

2017

Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

Self Cite

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“…The distinguished characteristics of near-fault records to those of far-fault can be clearly described based on observation in Figure 2 [42] large long period velocity pulse. It may range from 2s to 5s [43][44][45] which is similar to the fundamental natural period range of 15 to 50 storey buildings [44]. This characteristic can be also recognized in Figure In near-fault regions, the characteristics of earthquake records depend on the faulting mechanism, rupture propagation and the possible static deformation (fling-step effects) [40,48].…”

Section: Characteristics Of Near-fault Earthquakesmentioning

confidence: 70%

“…These models will later be used in subsequent chapters to compare with the new damage model for concrete. The third part of this chapter presents the distinct characteristics of near-fault motions in comparison to far-fault ones: pulse-type, long pulse-type period [43][44][45], high energy at the onset of records [51,52], high peak ground acceleration [55], intense velocity [45,55,56], and large displacements (fling-step) [57,58]. This is followed by a number of models of near-fault ground motions.…”

Section: Discussionmentioning

confidence: 98%

“…This high input energy leads to different responses of structures when subjected to near-fault motions compared to the far-fault records. They impose high demands on structures and force the structures to absorb a large amount of this input energy in few large displacement cycles [40,43,53,54] at the beginning of earthquakes.…”

Section: Characteristics Of Near-fault Earthquakesmentioning

confidence: 99%

“…Mollaioli et al [43] studied the characterization of damage potential of pulse-type motions in nearfault regions. They emphasized that the key factor that causes damage to structures are large velocity and displacement demands induced by severe, long duration pulses of near-field earthquakes which forces the structures to receive a large amount of energy in a short time and its response in a way that a high amount of energy needs to be quickly dissipated.…”

Section: Effects Of Near-fault Earthquakes On Rc Structuresmentioning

confidence: 99%

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Seismic damage assessment and FRP retrofit of reinforced concrete structures

Cao¹

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Only a small percentage of existing buildings around the world have been designed and constructed based on modern seismic codes. Majority of these buildings were designed and built based on older codes and thus are now identified as potentially hazardous due to more stringent seismic requirements of newer seismic standards. Consequently, these structures are vulnerable to earthquakes as has become evident in the recent earthquake events. Mitigating the seismic hazards for these deficient structures, instead of replacement, has been increasingly looked at by the engineering community due to obvious economic reasons.An important first step towards this mitigation is called "Damage Assessment". Damage Assessment by definition is the evaluation of potential damage in a particular structure in a seismic event. There exist many indices such as drift based on which the extent of potential damage in a building can be described. Choosing the right index and understanding how a particular index would correlate with the seismic parameters or how sensitive it would be to a particular seismic event is quite important. Many structures, for example, are structurally sound under far fault earthquakes but may suffer from extensive damage if a near fault earthquake occurs.While many studies have been undertaken in the past towards methods of analysis that best simulate the damage and on the development of indices that better represent it, the efforts are isolated and in some instances contradictory. The current study thus attempts to address the gaps in the state of the art and presents a coherent and consistent understanding of the issue together with the introduction of a couple of damage mitigation methods.The main achievements of this thesis are as follows:A simplified model for inelastic analysis of RC structures subjected to earthquakes is developed.A new damage model that appropriately assesses the damage of RC structures is proposed. This new damage model is based on the single parameter of energy which naturally overrides and implicitly incorporates a number of parameters such as force, deformation and number of cycles.Damage assessment in RC structures using the new damage model is performed.Correlation between seismic parameters and damage indices of structures is investigated.A new definition for near-fault earthquakes is developed and regions with different damage potential are established.

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Effectiveness of friction dampers on the seismic behavior of high rise building VS shear wall system

Armali

Damerji

Hallal

et al. 2019

Engineering Reports

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after first online publication: Majd Armaly's surname has been corrected from 'Majd Armali' to 'Majd Armaly'] The increase in population especially in third world countries demands taller, more flexible, and lighter buildings. Most of these countries are subjected to a high risk of earthquakes, which requires more control of building seismic response. However, several techniques exist to minimize the vibrations induced by an earthquake shock. This paper will discuss the effectiveness of using friction dampers as a passive dissipative device and proposes some design optimization of the number and position of dampers in the building. Friction dampers offer a supplemental damping in conjunction with appropriate stiffness, offering an innovative and attractive solution for the seismic response control of tall structures in risky areas. The originality of this work is in the detailed seismic study of an asymmetric reinforced concrete (RC) building, located in a risky seismic zone and using real earthquake seismic waves. The seismic response of this dissipative structural method is compared with the response of the conventional method (shear wall system) for the high rise building. To accomplish this objective, a nonlinear modal time history analysis using the El Centro earthquake record for a 40-storey RC high rise building, is performed with four different damper type formats using ETABS software. To illustrate the response improvement by dampers, storey accelerations, storey displacements, base shear forces, and storey drifts are compared with a conventional fixed base system (shear wall system) for the same building. Results show that using an optimum position and number of dampers, a tall building can remain operational during a seism.

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Characterization of the Dynamic Response of Structures to Damaging Pulse-type Near-fault Ground Motions

Cited by 45 publications

References 26 publications

Accuracy of Equivalent Linear Models for Bilinear Oscillators Under Pulse-Like Ground Motion

Accuracy of Equivalent Linear Models for Bilinear Oscillators Under Pulse-Like Ground Motion

Seismic damage assessment and FRP retrofit of reinforced concrete structures

Effectiveness of friction dampers on the seismic behavior of high rise building VS shear wall system

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