Correlations Between Frequency Content Indicators of Strong Ground Motions and PGV

Pavel, Florin; Lungu, Dan

doi:10.1080/13632469.2012.762957

Cited by 30 publications

(10 citation statements)

References 8 publications

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“…The ground motions were selected based on the ratio of the peak ground acceleration (PGA) to the peak ground velocity (PGV). The PGA/PGV ratio is known to correlate well with the frequency characteristics of the ground motion and to account for many seismo-tectonic features and seismic site effects (Pavel and Lungu 2013). A total of 15 ground motion records were chosen to have different PGA/PGV ratios, and the selected records fell into three categories depending on the PGA/PGV ratio (Zhu et al 1988): low (less than 0.8 g/m/s), medium (between 0.8 and 1.2 g/m/s), and high (greater than 1.2 g/m/s).…”

Section: Input Ground Motionsmentioning

confidence: 99%

Fragility Analysis of Space Reinforced Concrete Frame Structures with Structural Irregularity in Plan

Moon

Lee

2018

J. Struct. Eng.

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Because significant damages to structures having structural irregularity in their plans were repeatedly observed during many past earthquakes, there have been great research efforts to evaluate their seismic vulnerability. Although most of the previous studies used simplified structural representations such as one-dimensional or two-dimensional models in the fragility analysis of plan-irregular structures, simple analytical models could not represent true seismic behavior from the complicated nonlinear coupling between lateral and torsional responses as the degree of irregularity increased. For space structures with high irregularity, more realistic representations such as threedimensional models are needed for proper seismic assessment. However, the use of computationally expensive models is not practically feasible with existing approaches of fragility analysis. Thus, in this study, a different approach is adopted that can produce vulnerability curves efficiently, even with a three-dimensional model. In this approach, an integrated computational framework is established that combines reliability analysis and structural analysis. This enables evaluation of the limit-state faction without constructing its explicit formula, and the failure probability is calculated with the first-order reliability method (FORM) to deal with the computational challenge. Under the integrated framework, this study investigates the seismic vulnerability of space reinforced concrete frame structures with varying plan irregularity. Material uncertainty is considered, and more representative seismic fragility curves are derived with their three-dimensional analytical models. The effectiveness of the adopted approach is discussed, and the significant effect of structural irregularity on seismic vulnerability is highlighted.

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Section: Input Ground Motionsmentioning

confidence: 99%

Fragility Analysis of Space Reinforced Concrete Frame Structures with Structural Irregularity in Plan

Moon

Lee

2018

J. Struct. Eng.

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“…For example, DUZ from the near-field set of earthquake versus GIL3 from the far-field (Table 2) have PGAs of 0.515g and 0.559g, and PGV of 84m/s and 36m/s, respectively. As outlined in Zhu et al [1988] and Pavel and Lungu [2013], the PGV/PGA ratio can be used as an indicator of both frequency content of strong ground motions and potential structural damage. They revealed that low PGV/PGA ratios generally correspond to ground motions with a high frequency content in the strong-motion phase (e.g.…”

Section: Effect Of Near-field and Far-field Earthquakes On Optimum Dementioning

confidence: 99%

Simplified Method for Optimal Design of Friction Damper Slip Loads by Considering Near-Field and Far-Field Ground Motions

Nabid

Hajirasouliha

Petkovski

2019

Journal of Earthquake Engineering

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A simplified method is proposed for optimum design of friction dampers by considering the characteristics of design earthquakes. Optimum slip loads for 3, 5, 10, 15 and 20-storey RC frames with friction wall-dampers are obtained for a set of 20 near and far-field earthquakes as well as artificial spectrum-compatible records scaled to different acceleration levels. Optimum solutions are shown to be more sensitive to Peak Ground Velocity (PGV) than Peak Ground Acceleration (PGA), especially for near-field earthquakes with high velocity pulses. For identical PGA levels, far-field earthquakes on average result in 1.5 times lower optimum slip loads compared to near-field records, while they lead to 118% higher energy dissipation and 24% lower maximum inter-storey drifts. Empirical equations are proposed to predict optimum slip loads (as a function of number of storeys and PGA/PGV of design earthquakes) and their efficiency is demonstrated through selected examples.

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“…The ratio ω g =PGA/PGV is employed in this work to define the time scale 1/ω g . This ratio has been extensively used for analyzing the influence of the ground motion characteristics on the performance of isolated systems [27]- [29] and numerous works have demonstrated that it provides useful information on the frequency content and other characteristics of an input motion [32], [35]. In general, inverse correlation can be found between PGA/PGV and the magnitude M, the source to site distance R, the predominant period of the soil site [34], and also the stochastic bandwidth indicator ε, which gives a measure of the frequency band of a random process.…”

Section: Seismic Input Descriptionmentioning

confidence: 99%

“…For these reasons, the PGA/PGV has been preferred for this study to other time scales commonly employed in the literature such as the predominant period of the ground motion T m [40]- [44]. However, it should be observed that a strong inverse correlation is found between PGA/PGV and T m [35]. Thus, these measures are equally good for describing the characteristics of the ground motion input.…”

Section: Seismic Input Descriptionmentioning

confidence: 99%

Influence of ground motion characteristics on the optimal single concave sliding bearing properties for base-isolated structures

Castaldo

Tubaldi

2018

Soil Dynamics and Earthquake Engineering

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This study examines the influence of ground motion characteristics on the optimal friction properties of single concave sliding bearings employed for the seismic isolation of structural systems. The evaluation of the optimal properties is carried out by considering a non-dimensional formulation which employs the peak ground acceleration (PGA) and the peak ground acceleration-to-velocity (PGA/PGV) ratio as ground motion parameters. A two-degree-of-freedom (2dof) model is employed to describe the isolated system and two different families of records representative respectively of near fault and far field seismic inputs are considered. Following the nondimensionalization of the equation of motion for the proposed ground motion parameters, it is shown that the non-dimensional responses obtained for the two types of seismic inputs are similar. This result confirms that PGA/PGV is a good indicator of the frequency content and of other characteristics of ground motion records, helping to reduce the scatter in the response. Regression expressions are also obtained for the optimal values of the friction coefficient that minimizes the superstructure displacements relative to the base as a function of the abovementioned ground motion parameter and of the dimensionless system parameters. These expressions can be used for the preliminary estimation of the optimal properties of isolation bearings with a single concave sliding surface or double concave sliding surfaces with equal friction coefficient

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Correlations Between Frequency Content Indicators of Strong Ground Motions and PGV

Cited by 30 publications

References 8 publications

Fragility Analysis of Space Reinforced Concrete Frame Structures with Structural Irregularity in Plan

Fragility Analysis of Space Reinforced Concrete Frame Structures with Structural Irregularity in Plan

Simplified Method for Optimal Design of Friction Damper Slip Loads by Considering Near-Field and Far-Field Ground Motions

Influence of ground motion characteristics on the optimal single concave sliding bearing properties for base-isolated structures

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