Influence of Rotating Strong Ground Motions on the Response of Doubly Symmetrical RC Wall Structures in Romania and Its Implication on Code Provisions

Pavel, Florin; Nica, George Bogdan

doi:10.1007/s40999-018-0346-4

Cited by 6 publications

(11 citation statements)

References 17 publications

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“…It is clear, as expected, from the figures that the proposed combination rule closely follow the Sadhu and Gupta [27] method and both predict the exact variation satisfactorily. This also emphasizes the efficacy of the proposed modification of Sadhu and Gupta [27] method made through Equations (34) (36). It can now be argued that the accuracy of the proposed rule depends on that of Sadhu and Gupta [27] method and it is possible to accommodate any other combination rule, applicable for narrow-band excitation, in the proposed framework.…”

Section: Numerical Illustrations For Modal Combination Rulementioning

confidence: 76%

“…Many researchers have appreciated the importance of the directionality in seismic behaviour of civil structures and continued their research works in the direction of improving seismic design by incorporating the directionality. [31][32][33][34][35][36][37] The most rigorous way to get the effect of directionality is carrying out nonlinear time-history analyses (NTHA) of a structure subjected to bi-directional ground motion with different incident angles. [38] And for that, simulation of samples for a bidirectional ground motion process is necessary if such an effect of directionality is to be characterized statistically.…”

Section: Introductionmentioning

confidence: 99%

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Bi‐directional ground motions: Stochastic simulation and frequency‐dependent modal combination rule

Naskar

Das

2021

Earthq Engng Struct Dyn

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For direct statistical analysis of 3‐D structures against lateral earthquake shaking, stochastic simulation of fully nonstationary bi‐directional ground motions is essential. The recorded bi‐directional ground motions (or their projections) along the two orthogonal axes of a structure are usually correlated and their correlation influences the overall structural response. Further, the correlation is, in general, frequency‐dependent, that is, the correlation coefficients are different for different narrow frequency bands of the (composite) pair of motions. So it is important to have a method for stochastic simulation of bi‐directional motions that can maintain a target frequency‐dependent correlation. This type of simulated ensemble of bi‐directional motions for a recording process provides a sound basis for the statistical analysis of structural response vis‐à‐vis the observed/recorded correlation. In the present paper, a Priestley process based framework is proposed to simulate bi‐directional ground motions that can emulate the frequency‐dependent correlation structure of the parent recording process while maintaining the time–frequency characteristics of the recorded bi‐directional motion. Since principal directions are frequency‐dependent, it is imperative to develop a modal combination rule for multi‐directional ground motions which can address the frequency‐dependence of principal directions. For this purpose, a new ground motion frequency‐dependent modal combination rule is also proposed. It is found that the proposed frequency‐dependent combination rule performs better than the conventional frequency‐independent one, especially when the response is dominated by some frequency bands having different individual principal directions from each other or from those of the composite pair of motions.

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Section: Numerical Illustrations For Modal Combination Rulementioning

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Bi‐directional ground motions: Stochastic simulation and frequency‐dependent modal combination rule

Naskar

Das

2021

Earthq Engng Struct Dyn

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“…The lack of specific code provisions with regard to the axes of the strong motion input leads to the application of the horizontal earthquake components along the structural axes of the buildings. This common engineering practice can result in significant underestimation of seismic demands (Athanatopoulou [2]; Rigato and Medina [3]; Kostinakis et al [4][5][6][7]; Fontara et al [8]; Pavel and Nica [9]; Cavdar and Ozdemir [10]; Skoulidou et al [14]; Lucchini et al [43]; Nguyen and Kim [44]; Roy et al [45]).…”

Section: The Influence Of Incident Angle On the Seismic Response Of Rc Buildingsmentioning

confidence: 99%

“…They found that the structural response is strongly dependent on the strong motion's direction. Pavel and Nica [9] investigated the seismic behaviour of doubly symmetric RC wall structures subjected to a series of bi-directional ground motion recordings. They revealed that the structural response is dependent on the orientation of the strong ground motion horizontal components.…”

Section: Introductionmentioning

confidence: 99%

Rapid Prediction of Seismic Incident Angle's Influence on the Damage Level of RC Buildings Using Artificial Neural Networks

Morfidis¹,

Kostinakis²

2021

Preprint

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The angle of seismic excitation is a significant factor of the seismic response of RC buildings. The procedure required for the calculation of the angle for which the potential seismic damage is maximized (critical angle) contains multiple nonlinear time history analyses using in each one of them different angles of incidence. Moreover, the seismic codes recommend the application of more than one accelerograms for the evaluation of seismic response. Thus, the whole procedure becomes time consuming. Herein, a method to reduce the time required for the estimation of the critical angle based on Multilayered Feedforward Perceptron Neural Networks is proposed. The basic idea is the detection of cases in which the critical angle increases the class of seismic damage compared to the class which arises from the application of the seismic motion along the buildings’ structural axes. To this end, the problem is expressed and solved as Pattern Recognition problem. As inputs of networks the ratios of seismic parameters’ values along the two horizontal seismic records' components, as well as appropriately chosen structural parameters, were used. The results of analyses show that the neural networks can reliably detect the cases in which the calculation of the critical angle is essential.

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“…Buildings with concrete shear walls have been widely used in earthquake-prone areas to provide enhanced strength, stiffness, and ductility capacity against possible earthquakes. however they were severely damaged during previous earthquakes, compromising their performance [1][2][3][4][5]. In most cases, the damaged buildings were rebuilt due to the difficulties in repairing concrete shear walls and/or the fact that an required performance may not be ensured after repairing.…”

Section: Introductionmentioning

confidence: 99%

Multicriteria Decision-Making Methods in Selecting Seismic Upgrading Strategy of High-Rise RC Wall Buildings

et al. 2022

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Reinforced concrete (RC) structural walls are widely used in high-rise structures in earthquakeprone areas. Damaged by the earthquakes in the past decades, these buildings need retrofitting in order to increase the resilience of buildings with concrete shear walls. This study aimed to investigate the retrofitting of high-rise RC wall buildings using energy dissipation devices. To this end, a total of 4 buildings with 15, 20, 25, and 30 stories equipped with concrete shear walls as their lateral load-resisting system were retrofitted using passive seismic control systems. The buildings were subjected to the set of the far-field and near-field record presented in the Federal Emergency Management Agency (FEMA) P695, and an index was defined to relate the structural responses of the building, such as drift, acceleration, velocity, displacement, and base shear, to the earthquake records. The resulting index values were considered as the criterion, and the passive seismic control systems were ranked by the efficient multi-criterion decision-making (MCDM) method. Based on the results from the MCDM and using the considered criteria, friction damper was ranked first among the avaiable energy dissipation devices for high-rise RC wall buildings.

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Influence of Rotating Strong Ground Motions on the Response of Doubly Symmetrical RC Wall Structures in Romania and Its Implication on Code Provisions

Cited by 6 publications

References 17 publications

Bi‐directional ground motions: Stochastic simulation and frequency‐dependent modal combination rule

Bi‐directional ground motions: Stochastic simulation and frequency‐dependent modal combination rule

Rapid Prediction of Seismic Incident Angle's Influence on the Damage Level of RC Buildings Using Artificial Neural Networks

Multicriteria Decision-Making Methods in Selecting Seismic Upgrading Strategy of High-Rise RC Wall Buildings

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