Simplification of Earthquake Accelerograms for Quick Time History Analyses by using Their Modified Inverse Fourier Transforms

Faroughi, Alireza; Hosseini, Mahmood

doi:10.1016/j.proeng.2011.07.361

Cited by 5 publications

(3 citation statements)

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“…Then, by using the developed computer program the corresponding Inverse Fourier Transform is calculated, using a relatively large time step, depending on the period of the highest used frequency (which is usually 5 to 10 times larger than the original accelerogram's time step) to create the simplified accelerogram. The use of accelerograms, simplified by the proposed method, in case of linear systems, and the good precision of the calculated responses have been presented in a previous paper of the authors, Faroughi and Hosseini, [4], in 2010. The details of this technique are described in the following section of the paper, and its efficiency in reducing the required time for the cases of nonlinear time history analysis (NLTHA) is also shown by some numerical examples.…”

Section: Introductionmentioning

confidence: 92%

Simplification of earthquake accelerograms for quick nonlinear time history analyses by using modified Inverse Fourier Transform

Faroughi¹,

Hosseini²

2012

WIT Transactions on the Built Environment

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In seismic design and evaluation of irregular buildings most codes recommend nonlinear time history analysis (NLTHA), which is very time-consuming, mainly since the time step size of the digitized accelerograms is usually very small. Therefore, if the NLTHA analysis can be performed by large time steps without losing much precision, it can be very helpful. This paper introduces a method for simplification of accelerograms based on the modification of their Fourier analyses. In the proposed method the Fourier Spectrum of the accelerogram is calculated first, and then, by using a computer program, developed by the authors, the corresponding Inverse Fourier Transform is calculated using a relatively large time step, depending on the structure's periods, which is usually 5 to 10 times of the original accelerogram's time step) to create the simplified accelerogram. Obviously, time history analysis by using this simplified accelerogram is much less time-consuming. Numerical results show that the maximum response values obtained by using the simplified accelerograms have only 5 to 10 percent error, depending on the type of the structure and the features of the used records.

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Section: Introductionmentioning

confidence: 92%

Simplification of earthquake accelerograms for quick nonlinear time history analyses by using modified Inverse Fourier Transform

Faroughi¹,

Hosseini²

2012

WIT Transactions on the Built Environment

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“…Motion of the base is represented by the accelerogram [1]. This method is described in [3,4] as well.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Methods Used for Seismic Analysis of Structures

Čada

Máca

2017

APP

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Abstract. This paper investigates effects of the seismic load to a structure. The article describes main methods of the definition and practical application of the seismic load based on the Standard Eurocode 8. There was made a comparison of all methods using the same structure. A simple two-storeyed concrete 2D-frame with fixed joints was chosen. A one another model with rigid beams for some calculations was defined. The second model can be used for hand-calculations as a cantilever with two masses.The paper describes main dynamic properties of the chosen structure. Seismic load was defined by lateral force method, modal response spectrum, non-linear time-history analysis and pushover analysis. The time-history analysis is represented by accelerograms. There were made linear and non-linear calculations.

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“…Finally, Faroughi and Hosseini (2011) have proposed a method for quick time history analysis of linear systems by using the modified Inverse Fourier Transform of the accelerogram [6], which makes it possible to perform the analysis by consuming only around 20% of the usual time of the conventional seismic response analysis, with a very little error, mostly less than 5%.…”

Section: Introductionmentioning

confidence: 99%

Simplification of Earthquake Accelerograms for Rapid Time History Analysis Based on the Impulsive Load Concept

Hosseini¹,

Mirzaei²

2014

Proceedings of the 4th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Simplification of Earthquake Accelerograms for Quick Time History Analyses by using Their Modified Inverse Fourier Transforms

Cited by 5 publications

References 0 publications

Simplification of earthquake accelerograms for quick nonlinear time history analyses by using modified Inverse Fourier Transform

Simplification of earthquake accelerograms for quick nonlinear time history analyses by using modified Inverse Fourier Transform

Comparison of Methods Used for Seismic Analysis of Structures

Simplification of Earthquake Accelerograms for Rapid Time History Analysis Based on the Impulsive Load Concept

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