A state-of-knowledge review on the endurance time method

Estekanchi, Homayoon E.; Mashayekhi, ‪Mohammadreza; Vafai, Hassan A.; Ahmadi, Goodarz; Mirfarhadi, S. Ali; Harati, Mojtaba

doi:10.1016/j.istruc.2020.07.062

Cited by 50 publications

(27 citation statements)

References 49 publications

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“…Similarly, a linear scaling should be applied at all other times. This requirement can be formulated as follows [8]…”

Section: Et Excitation Functionsmentioning

confidence: 99%

“…Obviously, these simplifications are not an inherent part of the concept behind the ET method, but are just being made in order to synthesize a preliminary ETEF function [8]. Analytical approaches to find acceleration functions that satisfy conditions such as Equation ( 1) are formidably complicated [12,30,31].…”

Section: Et Excitation Functionsmentioning

confidence: 99%

“…In another effort, modal pushover analysis (MPA) [1,6,7] is used instead of real RHA [5]. Endurance Time (ET) method is a response history based analysis procedure that can be used for estimating the seismic response of structures at different excitation levels in each response history [8]. In the ET method, a particular ground motion named acceleration function, tries to simulate minor, moderate, and major earthquakes throughout its duration in a single record [9].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Application of endurance time method in damage assessment of concrete moment frames

Baniassadi

Estekanchi

2020

NMCE

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Nonlinear Time History (NTH) analysis is currently the most reliable method for estimating structural behavior. Considerable computational demand and complexity of this method may cause difficulty for its routine practical application. Based on the Methodology of Endurance Time (ET) method, it can estimate the nonlinear response of structures with a much lower computational cost. In this research, the reliability of the ET method in the analysis of concrete moment frames will be discussed. The results of the ET method are compared with those acquired from the NTH method by considering some energy Engineering demand parameters(EDP) like base shear roof displacement. Furthermore, the accuracy of this method for estimating damage in structures was evaluated by considering inter story Drift, Park-Ang, and Bozorgnia-Bertero models as samples of damage indices. It is observed that the nonlinear dynamic response of structures and damage indices can be estimated by the ET method with reasonable accuracy.

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“…Similarly, a linear scaling should be applied at all other times. This requirement can be formulated as follows [8]…”

Section: Et Excitation Functionsmentioning

confidence: 99%

Section: Et Excitation Functionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Application of endurance time method in damage assessment of concrete moment frames

Baniassadi

Estekanchi

2020

NMCE

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“…The success of performing the ET method depends on the correct generation of the ET excitation functions (ETEFs). The ETEFs should be created in such a way they can be employed to anticipate the effects of real ground motion [11][12][13]. In this research, the optimum slip load of FDDs was calculated according to their Efficiency Index (EFI) in steel frames.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of efficiency index of friction energy dissipation devices using endurance time method

Shirkhani

Azar

Basim

2020

NMCE

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Various methods have been presented to improve the performance of buildings against earthquakes. Friction damper device is one of the energy dissipation devices that appropriately absorbs and dissipates the input energy and decreases displacements. In this paper, the possibility of using endurance time method to determine the efficiency index and optimum slip load for these dampers was investigated by comparing the results of endurance time and nonlinear time history analyses. The efficiency indexes acquired from the average of results for nonlinear time history and endurance time analyses were close to each other. In this research, by assuming identical optimum slip load for the dampers in all stories, the normalized damper strength was increased in a number of equal steps ranging from zero to one to determine the efficiency index of dampers in each step. Then, the optimum slip load of dampers in the steel frames was calculated according to the minimum efficiency index of dampers. As a result, employing the endurance time method instead of a high number of nonlinear time history analyses is also possible, and using the endurance time method diminishes 57% of computational endeavors. Lastly, a relation for acquiring the optimum slip load of the friction damper devices in steel structures was proposed in terms of the weight of the structures. After adding optimal FDDs to the structures and investigating the effectiveness of the dampers, it was concluded that by using endurance time excitation function with better energy consistency, the endurance time results could be improved.

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“…It was shown that the valuebased design approach significantly increases the total economic value. Recently, a review of endurance time method, its concepts and applications has been carried out by Estekanchi et al [49]. In this research, by combining the uniform deformation theory and endurance time method, which are fast and accurate methods, a method is proposed for designing a structure that provides uniform deformation to the structure at all desired seismic hazard levels and utilizes the material's capacity more optimally.…”

Section: Introductionmentioning

confidence: 99%

The application of endurance time method for optimum seismic design of steel moment-resisting frames using the uniform deformation theory

Miri

Riahi

Mahmoudy

2020

NMCE

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The optimum seismic design of structures is one of the biggest issues for engineers to build resistant and economic structures. In this research, the application of the endurance time method in optimum performance design of steel moment-resisting frames using the uniform deformation method is evaluated. First, three steel moment-resisting frames with 3, 7 and 12 stories are considered. After that, the structures are optimized by endurance time method analysis and the uniform deformation theory, under a series of acceleration functions. Also, results are compared with the results of time history analysis based on earthquakes. The results revealed that endurance time method and time history analysis of earthquakes at low and moderate seismic hazard levels are well matched, while this adjustment does not exist for high seismic hazard level. In addition, the optimum structure at one hazard level does not lead to optimum structure in other hazard levels. To have the best performance at different hazard levels, the frames should be optimized at the moderate seismic hazard level. In order to optimize the structure at all seismic hazard levels, the GAP dampers can be used. These dampers should be effective after a specified drift at the lower seismic hazard level. In addition, the best values for convergence power of the uniform deformation method are between 0.05 to 0.15 for this purpose. By using such dampers, it is possible to have uniform drift distribution at different seismic hazard levels.

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A state-of-knowledge review on the endurance time method

Cited by 50 publications

References 49 publications

Application of endurance time method in damage assessment of concrete moment frames

Application of endurance time method in damage assessment of concrete moment frames

Evaluation of efficiency index of friction energy dissipation devices using endurance time method

The application of endurance time method for optimum seismic design of steel moment-resisting frames using the uniform deformation theory

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