مقاله انگلیسی رایگان در مورد ساختمانهای جدا شده با الاستومر – الزویر 2019

 

مشخصات مقاله
ترجمه عنوان مقاله قابلیت اطمینان ساختمانهای جدا شده با الاستومر تحت زمین لرزه های تاریخی با / بدون اثرات هدایتی رو به جلو
عنوان انگلیسی مقاله Reliability of elastomeric-isolated buildings under historical earthquakes with/without forward-directivity effects
انتشار مقاله سال 2019
تعداد صفحات مقاله انگلیسی 18 صفحه
هزینه دانلود مقاله انگلیسی رایگان میباشد.
پایگاه داده نشریه الزویر
نوع نگارش مقاله
مقاله پژوهشی (Research Article)
مقاله بیس این مقاله بیس نمیباشد
نمایه (index) Scopus – Master Journals List – JCR
نوع مقاله ISI
فرمت مقاله انگلیسی  PDF
ایمپکت فاکتور(IF)
3.604 در سال 2018
شاخص H_index 114 در سال 2019
شاخص SJR 1.628 در سال 2018
شناسه ISSN 0141-0296
شاخص Quartile (چارک) Q1 در سال 2018
مدل مفهومی ندارد
پرسشنامه ندارد
متغیر دارد
رفرنس دارد
رشته های مرتبط مهندسی عمران
گرایش های مرتبط زلزله، سازه
نوع ارائه مقاله
ژورنال
مجله / کنفرانس سازه های مهندسی – Engineering Structures
دانشگاه  Department of Civil Engineering, İstanbul University – Cerrahpaşa, Avcılar Campus, 34320 Avcılar, İstanbul, Turkey
کلمات کلیدی تجزیه و تحلیل قابلیت اطمینان، عدم قطعیت، روش شبیه سازی مونته کارلو، عملکرد لرزه ای، جداسازی پایه ای، اثرات هدایتی رو به جلو، زمین لرزه های نزدیک گسل
کلمات کلیدی انگلیسی Reliability analysis، Uncertainty، Monte Carlo simulation method، Seismic performance، Base isolation، Forward directivity effects، Near-fault earthquakes
شناسه دیجیتال – doi
https://doi.org/10.1016/j.engstruct.2019.05.081
کد محصول  E12442
وضعیت ترجمه مقاله  ترجمه آماده این مقاله موجود نمیباشد. میتوانید از طریق دکمه پایین سفارش دهید.
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فهرست مطالب مقاله:
Abstract
1. Introduction
2. Mathematical model
3. Ground motion records
4. Time history and reliability analyses
5. Conclusions
Acknowledgments
References

 

بخشی از متن مقاله:
Abstract

Deviations from nominal design values of mechanical characteristics of seismic isolators are inevitable due to uncertainties and/or errors in material properties, element dimensions, construction methods, quality control, and/or installation steps, etc. In addition, due to uncertainties existing in active fault mechanisms affecting the site and local soil conditions, earthquake ground motions show record-to-record variability. Moreover, environmental conditions and/or time-dependent factors such as aging, temperature, and travel, etc. may also cause additional deviations in nominal values of characteristics of seismic isolators and thus in structural responses over the service life of structures. Therefore, in order to capture the dynamic behavior of base-isolated buildings realistically and design reliable base-isolated buildings, influence of such uncertainty should be taken into account. In this study, seismic reliability of realistic fully three-dimensional benchmark multi-story buildings equipped with nonlinear isolation systems is investigated under historical near-fault earthquakes. In order to take into account the uncertainties in the isolation system characteristics, pre-yield stiffness, post-yield stiffness, and yield displacement parameters are assumed as random variables, while the record-to-record variability nature of the ground motions is considered by using large sets of historical near-fault ground motions with or without forward-directivity effects. Two different levels of nominal isolation periods are taken into account while three different levels of uncertainty are considered for the random isolator characteristics. The reliability of the buildings is investigated in terms of structural integrity, isolation system safety, and the safety of the vibration-sensitive contents of the buildings using the peak bearing displacements and the peak floor accelerations obtained from the nonlinear time history analyses conducted in the framework of the Monte Carlo simulations. The plots including the average reliabilities for the displacement and the acceleration limit values provide a comprehensive picture in terms of the reliability level of the structural systems and of the vibration sensitive contents.

Introduction

Seismically isolated structures are generally mission-critical structures housing vibration-sensitive equipment which must go on serving even during an earthquake. However, such equipment may fail if floor accelerations sustained during such motions exceed certain limit values. In addition, the isolators may fail different failure modes [1] and endanger safety of the whole structure. Isolation system displacements may exceed the design limits for the base displacements and therefore cause buckling and/or rupture of isolators may occur [2]. Buckling is a specific concern for stability of elastomeric isolators when the critical axial load capacities of the isolators are exceeded along with the increases in the horizontal isolator displacements [3,4]. In such a case, the subject isolator displacements become unconstrained and increase freely [5]. In another failure mode, cavitation damages occur at a critical tensile stress value inside a rubber layer and gain importance for horizontal displacement levels corresponding to shear strains above 100% [6,7]. Finally shear failure could be observed at very high shear (i.e., on the order of approximately 300–500%) strain levels [4,8,1]. Above all these, in case one of the abovementioned failure modes occur in a significant number of isolators almost simultaneously, this may lead to the collapse of the whole isolation system [1]. Therefore, for obtaining reliable seismically isolated structural systems, it is economically and sometimes vitally important to determine the actual mechanical properties of isolation elements, which are used in the dynamic analyses of the subject systems, and take into account the factors that may lead to deviations in those mechanical characteristics.

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