Simulation of Endurance Time Excitations via Wavelet Transform

Mashayekhi, ‪Mohammadreza; Estekanchi, Homayoon E.; Vafai, Hassan A.

doi:10.1007/s40996-018-0208-y

Cited by 16 publications

(18 citation statements)

References 24 publications

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“…Recent applications of the wavelet transform in the field of civil engineering are readily found in several types of research, including the one related to the dynamic analysis of structures, damage detection, and system identification . Readers are referred to the work of Mashayekhi et al for more details on finding how DWT can be employed for simulation of new ETEF functions. In this study, the first eight levels of the wavelet are considered; therefore, decision variables calreduce to 512.…”

Section: Simulation Of Endurance Time Excitation Functionsmentioning

confidence: 99%

Development of an alternative PSO‐based algorithm for simulation of endurance time excitation functions

Mashayekhi

Harati

Estekanchi

2019

Engineering Reports

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This paper presents a particle swarm optimizer for production of endurance time excitation functions (ETEFs). These excitations are intensifying acceleration time histories that are used as input motions in endurance time (ET) method. The accuracy of the ET methods heavily depends on the accuracy of ET excitations. Unconstrained nonlinear optimization is employed to simulate these excitations. Particle swarm optimization (PSO) method as an evolutionary algorithm is examined in this paper to achieve a more accurate ETEF, where optimal parameters of the PSO are first determined using a parametric study on the involved variables. The proposed method is verified and compared with the trust‐region‐reflective method as a classical optimization method and imperialist competitive algorithm as a recently developed evolutionary method. Results show that the proposed method leads to more accurate ET excitations.

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Section: Simulation Of Endurance Time Excitation Functionsmentioning

confidence: 99%

Development of an alternative PSO‐based algorithm for simulation of endurance time excitation functions

Mashayekhi

Harati

Estekanchi

2019

Engineering Reports

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“…ETA is an innovative dynamic analysis in which structures are subjected to endurance time excitation functions (ETEFs)—intensifying acceleration functions. Seismological parameters of the ETEFs were found to be well correlated with the ones related to the real GMs . Figure depicts an ETEF record named ETA20inx01.…”

Section: Introductionmentioning

confidence: 81%

An investigation on the interaction of moment‐resisting frames and shear walls in RC dual systems using endurance time method

Estekanchi

Harati

Mashayekhi

2018

Structural Design Tall Build

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Summary Reinforced concrete (RC) dual systems are composed of RC moment‐resisting frames (MRFs) and RC shear walls, where MRFs are barely designed to handle gravity loads. Investigations have demonstrated that shear walls exert negative effects on the upper part of MRFs. In this paper, the interaction of shear walls and MRFs is inspected using endurance time (ET) method. ET is a dynamic time history‐based pushover procedure in which structures are exposed to a set of predefined intensifying ET acceleration functions. In this method, seismic performance of the considered structure is assessed based on earthquake return periods; during which, required predefined seismic performance objectives are fulfilled. In this study, several buildings with RC dual systems were designed based on the conventional codes. Next, their nonlinear duplicates were generated for the application of the ET analysis. It was revealed that shear wall elements impose considerable rotational demands—exceeding the criteria established by ASCE41‐13—on the beams and columns, especially those located on the upper parts of the buildings. This paper puts forth and reviews certain methods to cushion the negative effects brought about by RC shear walls, along with a detailed discussion on their merits and demerits.

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“…The challenging part of this method lies in generating the endurance time excitation functions (ETEFs), Figure 3a. Initial generation of ETEFs were only based on acceleration and displacement response spectra [58], while the recent advances in the simulation of ETEFs can be found in Mashayekhi and Estekanchi [59], and Mashayekhi et al [60][61][62], where the functions were optimized in the time and frequency domains accounting for the acceleration and displacement response spectra, as well as the nonlinear displacement, absorbed hysteretic energy, number of effective cycles, etc. Unconstrained nonlinear optimization is used to simulate ETEFs.…”

Section: Endurance Time Analysismentioning

confidence: 99%

On the Dynamic Capacity of Concrete Dams

et al. 2019

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The purpose of this joint contribution is to study the maximum dynamic load concrete dams can withstand. The so-called "dynamic capacity functions" for these infrastructures seems now technically and commercially feasible thanks to the modern finite element techniques, hardware capabilities, and positive experiences collected so far. The key topics faced during the dynamic assessment of dams are also discussed using different point of view and examples, which include: the selection of dynamic parameters, the progressive level of detail for the numerical simulations, the implementation of nonlinear behaviors, and the concept of the service and collapse limit states. The approaches adopted by local institutions and engineers on the subject of dam capacity functions are discussed using the authors' experiences, and an overview of time and resources is outlined to help decision makers. Three different concrete dam types (i.e., gravity, buttress, and arch) are used as case studies with different complexities. Finally, the paper is wrapped up with a list of suggestions for analysts, the procedure limitations, and future research needs.

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Simulation of Endurance Time Excitations via Wavelet Transform

Cited by 16 publications

References 24 publications

Development of an alternative PSO‐based algorithm for simulation of endurance time excitation functions

Development of an alternative PSO‐based algorithm for simulation of endurance time excitation functions

An investigation on the interaction of moment‐resisting frames and shear walls in RC dual systems using endurance time method

On the Dynamic Capacity of Concrete Dams

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