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RISS 인기검색어
- 검색키워드
- 저자 : Sonia E. Ruiz (검색결과 5 건)
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Demands and distribution of hysteretic energy in moment resistant self-centering steel frames
Arturo López-Barraza,Sonia E. Ruiz,Alfredo Reyes-Salazar,Edén Bojórquez 국제구조공학회 2016 Steel and Composite Structures, An International J Vol.20 No.5
Post-tensioned (PT) steel moment resisting frames (MRFs) with semi-rigid connections (SRC) can be used to control the hysteretic energy demands and to reduce the maximum inter-story drift (<i>γ</i>). In this study the seismic behavior of steel MRFs with PT connections is estimated by incremental nonlinear dynamic analysis in terms of dissipated hysteretic energy (<i>E<sub>H</sub></i>) demands. For this aim, five PT steel MRFs are subjected to 30 long duration earthquake ground motions recorded on soft soil sites. To assess the energy dissipated in the frames with PT connections, a new expression is proposed for the hysteretic behavior of semi-rigid connections validated by experimental tests. The performance was estimated not only for the global <i>E<sub>H</sub></i> demands in the steel frames; but also for, the distribution and demands of hysteretic energy in beams, columns and connections considering several levels of deformation. The results show that <i>E<sub>H</sub></i> varies with <i>γ</i>, and that most of <i>E<sub>H</sub></i> is dissipated by the connections. It is observed in all the cases a log-normal distribution of <i>E<sub>H</sub></i> through the building height. The largest demand of <i>E<sub>H</sub></i> occurs between 0.25 and 0.5 of the height. Finally, an equation is proposed to calculate the distribution of <i>E<sub>H</sub></i> in terms of the normalized height of the stories (<i>h</i>/<i>H</i>) and the inter-story drift.
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Reliability over time of wind turbines steel towers subjected to fatigue
Emilio A. Berny-Brandt,Sonia E. Ruiz 한국풍공학회 2016 Wind and Structures, An International Journal (WAS Vol.23 No.1
A probabilistic approach that combines structural demand hazard analysis with cumulative damage assessment is presented and applied to a steel tower of a wind turbine. The study presents the step by step procedure to compare the reliability over time of the structure subjected to fatigue, assuming: a) a binomial Weibull annual wind speed, and b) a traditional Weibull probability distribution function (PDF). The probabilistic analysis involves the calculation of force time simulated histories, fatigue analysis at the steel tower base, wind hazard curves and structural fragility curves. Differences in the structural reliability over time depending on the wind speed PDF assumed are found, and recommendations about selecting a real PDF are given.
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Reliability over time of wind turbines steel towers subjected to fatigue
Berny-Brandt, Emilio A.,Ruiz, Sonia E. Techno-Press 2016 Wind and Structures, An International Journal (WAS Vol.23 No.1
A probabilistic approach that combines structural demand hazard analysis with cumulative damage assessment is presented and applied to a steel tower of a wind turbine. The study presents the step by step procedure to compare the reliability over time of the structure subjected to fatigue, assuming: a) a binomial Weibull annual wind speed, and b) a traditional Weibull probability distribution function (PDF). The probabilistic analysis involves the calculation of force time simulated histories, fatigue analysis at the steel tower base, wind hazard curves and structural fragility curves. Differences in the structural reliability over time depending on the wind speed PDF assumed are found, and recommendations about selecting a real PDF are given.
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Response transformation factors for deterministic-based and reliability-based seismic design
Edén Bojórquez,Juan Bojórquez,Sonia E. Ruiz,Alfredo Reyes-Salazar,Juan Velázquez-Dimas 국제구조공학회 2013 Structural Engineering and Mechanics, An Int'l Jou Vol.46 No.6
One of the main requirements of the seismic design codes must be its easy application by structural engineers. The use of practically-applicable models or simplified models as single-degree-offreedom (SDOF) systems is a good alternative to achieve this condition. In this study, deterministic and probabilistic response transformation factors are obtained to evaluate the response in terms of maximum ductility and maximum interstory drifts of multi-degree-of-freedom (MDOF) systems based on the response of equivalent SDOF systems. For this aim, five steel frames designed with the Mexican City Building Code (MCBC) as well as their corresponding equivalent SDOF systems (which represent the characteristics of the frames) are analyzed. Both structural systems are subjected to ground motions records. For the MDOF and the simplified systems, incremental dynamic analyses IDAs are developed in first place, then, structural demand hazard curves are obtained. The ratio between the IDAs curves corresponding to the MDOF systems and the curves corresponding to the simplified models are used to obtain deterministic response transformation factors. On the other hand, demand hazard curves are used to calculate probabilistic response transformation factors. It was found that both approaches give place to similar results.
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Response transformation factors for deterministic-based and reliability-based seismic design
Bojorquez, Eden,Bojorquez, Juan,Ruiz, Sonia E.,Reyes-Salazar, Alfredo,Velazquez-Dimas, Juan Techno-Press 2013 Structural Engineering and Mechanics, An Int'l Jou Vol.46 No.6
One of the main requirements of the seismic design codes must be its easy application by structural engineers. The use of practically-applicable models or simplified models as single-degree-of-freedom (SDOF) systems is a good alternative to achieve this condition. In this study, deterministic and probabilistic response transformation factors are obtained to evaluate the response in terms of maximum ductility and maximum interstory drifts of multi-degree-of-freedom (MDOF) systems based on the response of equivalent SDOF systems. For this aim, five steel frames designed with the Mexican City Building Code (MCBC) as well as their corresponding equivalent SDOF systems (which represent the characteristics of the frames) are analyzed. Both structural systems are subjected to ground motions records. For the MDOF and the simplified systems, incremental dynamic analyses IDAs are developed in first place, then, structural demand hazard curves are obtained. The ratio between the IDAs curves corresponding to the MDOF systems and the curves corresponding to the simplified models are used to obtain deterministic response transformation factors. On the other hand, demand hazard curves are used to calculate probabilistic response transformation factors. It was found that both approaches give place to similar results.
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