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مقاوم سازی لرزه ای ستون ها

عنوان فارسی مقاله: الگوریتم طراحی بهینه برای مقاوم سازی لرزه ای ستون های RC با تکنیک پوشش فولادی
عنوان انگلیسی مقاله: Optimal design algorithm for seismic retrofitting of RC columns with steel jacketing technique
مجله/کنفرانس: پروسیدیا ساخت – Procedia Manufacturing
رشته های تحصیلی مرتبط: مهندسی عمران
گرایش های تحصیلی مرتبط: سازه، زلزله
کلمات کلیدی فارسی: پوشش فولادی، محصور، منحنی تنش و کشش، OpenSEES، بهینه سازی
کلمات کلیدی انگلیسی: steel jacketing، confinement، stress-strain curve، OpenSEES، optimization
نوع نگارش مقاله: مقاله پژوهشی (Research Article)
نمایه: Scopus
شناسه دیجیتال (DOI): https://doi.org/10.1016/j.promfg.2020.02.245
دانشگاه: Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129, Turin, Italy
ناشر: الزویر - Elsevier
نوع ارائه مقاله: ژورنال
نوع مقاله: ISI
سال انتشار مقاله: 2020
ایمپکت فاکتور: 1.587 در سال 2019
شاخص H_index: 18 در سال 2020
شاخص SJR: 0.313 در سال 2019
شناسه ISSN: 2351-9789
شاخص Quartile (چارک): Q2 در سال 2019
فرمت مقاله انگلیسی: PDF
تعداد صفحات مقاله انگلیسی: 8
وضعیت ترجمه: ترجمه نشده است
قیمت مقاله انگلیسی: رایگان
آیا این مقاله بیس است: خیر
آیا این مقاله مدل مفهومی دارد: ندارد
آیا این مقاله پرسشنامه دارد: ندارد
آیا این مقاله متغیر دارد: ندارد
کد محصول: E14983
رفرنس: دارای رفرنس در داخل متن و انتهای مقاله
فهرست انگلیسی مطالب

Abstract


۱٫ Introduction


۲٫ Case study


۳٫ Proposed optimization framework


۴٫ Results of the optimization for the case study


۵٫ Conclusions


References

نمونه متن انگلیسی مقاله

Abstract


Steel jacketing (SJ) of beams and columns is widely employed as retrofitting technique to provide additional deformation and strength capacity to existing reinforced concrete (RC) frame structures. The latter are many times designed without considering seismic loads, or present inadequate seismic detailing. The use of SJ is generally associated with non-negligible costs depending on the amount of structural work and non-structural manufacturing and materials. Moreover, this kind of intervention results in noticeable downtime for the building. This paper presents a new optimization framework which is aimed at obtaining minimization of retrofitting costs by optimizing the position and the amount of steel jacketing retrofitting. The proposed methodology is applied to the case study of a 3D RC frame realized in OpenSEES and handled within the framework of a genetic algorithm. The algorithm iterates geometric and mechanical parameters configurations, based on the outcomes of static pushover analysis, in order to match the optimal retrofitting solution, intended as the one minimizing the costs and, at the same time, maintaining a specified safety level. Results of the proposed framework will provide optimized location and amount of steeljacketing reinforcement. It is finally shown that the use of engineering optimization methods can be effectively used to limit retrofitting costs without a substantial modification of structural safety.


Introduction


Steel jacketing is a widely employed technique to improve strength and deformation capacity reinforced concrete (RC) elements presenting critical conditions with respect to seismic and gravity loads condition Steel jacketing of columns is arranged in two possible ways. The first provides a full connection between the steel cage and the slab. In this case, besides the confinement effect, additional flexural strength is provided. For the cases in which full connections are not simple to be realized, steel jacketing is arranged by simply providing the cages. Also in this case a some additional flexural resistance is provided because of friction [1], but the most significant effect is related to the increase of column deformation capacity as consequence of confinement. Experimental and numerical investigations have been carried out by researches for both for the first typology of arrangement (e.g. [2-4]) and for the second one (e.g. [1,6-9]). Despite the effectiveness, it must be also said that steel jacketing is an invasive strengthening technique. In fact, its application to columns provides demolition and reconstitution of portions of masonry infills and plaster. Structural optimization is widely recognized as a valuable computational tool allowing engineers identifying cost-effective design solutions controlling design parameters, and several seismic design optimization applications for steel and RC structures are available in the literature (e.g. [10-17]). At the same time, the issue of the optimization of retrofitting interventions for RC structures has not been investigated many times in the past.

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