Generating high spectral consistent endurance time excitations by a modified time-domain spectral matching method

Zhang, Ruifu; Zhang, Luqi; Pan, Chao; Chen, Qingjun; Wang, Yanchao

doi:10.1016/j.soildyn.2021.106708

Cited by 14 publications

(3 citation statements)

References 38 publications

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“…As shown in Figure 5, to determine the target time series e, it was tried to use the mean spectrum of ASCE41-17 matching of these functions with the mean range of the set (GM1), which is shown in Table 6. By using new approach for ETA method [38][39], time-domain spectral matching algorithm was modified and utilized in several time durations. Furthermore, the matching precision is significantly enhanced, and the computation time is attenuated.…”

Section: Endurance Time Methodsmentioning

confidence: 99%

The Effect of Dolphin Echolocation-Fuzzy Logic Controller in Semi-active control of structural systems by using endurance time method

2023

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An adaptive fuzzy-logic -controller (FLC) is proposed to actuate MR damper smartly. Minimizing the excessive responses of building should be considered as a multi-objective optimization problem. The new generation structural systems should be designed based on seismic performance level. Designing based on performance requires dynamic, heavy and repetitive time history analyses. The endurance time analysis method (ETA) is a modern dynamic method based on the performance of the structure, which leads to the reduction of time and number of structural analyses. To investigate the efficiency of Dolphin Echolocation-Fuzzy Logic Controller (DE-FLC) and ETA, several ET simulations were performed. The seismic responses of 11th-story benchmark building equipped with MR dampers were investigated in two cases of seven time-history analysis and six generation of ET functions. By using Dolphin echolocation, the optimal arrangement and the number of sensors and dampers is determined. The proposed DE-FLC controller demonstrates its efficiency by reducing the excessive displacement under seismic excitations in comparison with uncontrolled case and classical FLC. Furthermore, the results demonstrate that sixth generation of ETA can simulate responses of several time-history analyzes well with proper accuracy, without necessitating any several computational burden.

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Section: Endurance Time Methodsmentioning

confidence: 99%

The Effect of Dolphin Echolocation-Fuzzy Logic Controller in Semi-active control of structural systems by using endurance time method

2023

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“…Such median floor response time histories are obtained from the system seismic time history analysis with the median ground input motions. There are many scientific studies for the ground input motions [19][20][21][22], but the seismic input motions considered in the load definition are based on the required design spectrum by the regulatory bodies such as US NRC RG-1.60 [23].…”

Section: Load Definition At Component Supportsmentioning

confidence: 99%

Study on Inelastic Strain-Based Seismic Fragility Analysis for Nuclear Metal Components

2021

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The main purpose of this study is to investigate the feasibility of the seismic fragility analysis (FA) with the strain-based failure modes for the nuclear metal components retaining pressure boundary. Through this study, it is expected that we can find analytical ways to enhance the high confidence of low probability of failure (HCLPF) capacity potentially contained in the conservative seismic design criteria required for the nuclear metal components. Another goal is to investigate the feasibility of the seismic FA to be used as an alternative seismic design rule for beyond-design-basis earthquakes. To do this, the general procedures of the seismic FA using the inelastic seismic analysis for the nuclear metal components are investigated. Their procedures are described in detail by the exampled calculations for the surge line nozzles connecting hot leg piping and the pressurizer, known as one of the seismic fragile components in NSSS (Nuclear Steam Supply System). To define the seismic failure modes for the seismic FA, the seismic strain-based design criteria, with two seismic acceptance criteria against the ductile fracture failure mode and fatigue-induced failure mode, are used in order to reduce the conservatism contained in the conventional stress-based seismic design criteria. In the exampled calculation of the inelastic seismic strain response beyond an elastic regime, precise inelastic seismic analyses with Chaboche’s kinematic and Voce isotropic hardening material models are used. From the results of the seismic FA by the probabilistic approach for the exampled target component, it is confirmed that the approach of the strain-based seismic FA can extract the maximum seismic capacity of the nuclear metal components with more accurate inelastic seismic analysis minimizing the number of variables for the components.

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“…Since ET references contend that using merely one or two of these records, results in wrong responses, for obtaining more precise and accurate results, all of them must be imposed to the structure and the maximum of absolute of their response time histories (not the mean or median of them), shall be utilized [17]. However, recently there is a growing interest in producing and utilizing a single ETEF with the help of special mathematical procedures such as the spectral matching method [18].…”

Section: Structural Responses and Performing The Comparisonmentioning

confidence: 99%

Estimating the response of concrete moment frames subjected to individual ground motions using Endurance Time excitation functions fitted to average acceleration response spectra

Davari

Estekanchi

2021

Scientia Iranica

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Generating high spectral consistent endurance time excitations by a modified time-domain spectral matching method

Cited by 14 publications

References 38 publications

The Effect of Dolphin Echolocation-Fuzzy Logic Controller in Semi-active control of structural systems by using endurance time method

The Effect of Dolphin Echolocation-Fuzzy Logic Controller in Semi-active control of structural systems by using endurance time method

Study on Inelastic Strain-Based Seismic Fragility Analysis for Nuclear Metal Components

Estimating the response of concrete moment frames subjected to individual ground motions using Endurance Time excitation functions fitted to average acceleration response spectra

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