یک رویکرد نظری در مورد تیر بتن مسلح پیش تنیده خارجی ضد انفجار
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یک رویکرد نظری در مورد تیر بتن مسلح پیش تنیده خارجی ضد انفجار

عنوان فارسی مقاله: تیر بتن مسلح پیش تنیده خارجی ضد انفجار: یک رویکرد نظری
عنوان انگلیسی مقاله: Blast resistance of externally prestressed RC Beam: A theoretical approach
مجله/کنفرانس: سازه های مهندسی - Engineering Structures
رشته های تحصیلی مرتبط: مهندسی عمران
گرایش های تحصیلی مرتبط: سازه، مدیریت ساخت
کلمات کلیدی فارسی: میله پیش تنیده خارجی، بارگذاری انفجاری، مدل نرخ حساس ، پاسخ دینامیکی، روش بخش لایه بندی شده
کلمات کلیدی انگلیسی: Externally prestressed beam، Blast loading، Rate-sensitive model، Dynamic response، Layered-section method
نوع نگارش مقاله: مقاله پژوهشی (Research Article)
نمایه: Scopus - Master Journal List - JCR
شناسه دیجیتال (DOI): https://doi.org/10.1016/j.engstruct.2018.10.079
دانشگاه: State Key Laboratory of Disaster Prevention & Mitigation of Explosion & Impact, Army Engineering University of PLA, Nanjing, Jiangsu 210007, China
ناشر: الزویر - Elsevier
نوع ارائه مقاله: ژورنال
نوع مقاله: ISI
سال انتشار مقاله: 2019
ایمپکت فاکتور: 3/167 در سال 2017
شاخص H_index: 104 در سال 2019
شاخص SJR: 1/69 در سال 2017
شناسه ISSN: 0141-0296
شاخص Quartile (چارک): Q1 در سال 2017
فرمت مقاله انگلیسی: PDF
تعداد صفحات مقاله انگلیسی: 14
وضعیت ترجمه: ترجمه نشده است
قیمت مقاله انگلیسی: رایگان
آیا این مقاله بیس است: بله
کد محصول: E11013
فهرست انگلیسی مطالب

Abstract


1- Introduction


2- Dynamic resistance model


3- Theoretical approach to dynamic responses of EPC beam


4- Verification of the theoretical approach


5- Parameter discussion


6- Conclusions


References

نمونه متن انگلیسی مقاله

Abstract


Externally prestressed reinforced concrete (EPC) is employed in long-span civil infrastructure, and a simplified dynamic analytical method is required to evaluate the blast-resistant performance of these EPC components. A theoretical approach is proposed that combines the elasto-viscoplastic rate-sensitive model with an improved layered-section method to predict the dynamic responses of EPC beams subjected to blast loadings, based on an equivalent single-degree-of-freedom system. A corresponding calculation program is compiled on the MATLAB platform. The proposed approach and the compiled program are validated by application to existing static and blast testing data, as well as the corresponding finite element calculation results. Three key parameters—the conventional reinforcement ratio ρs, the prestressing reinforcement ratio ρp, and the span-depth ratio l/h—that significantly affecting the dynamic responses of the EPC beam to explosion are discussed, providing useful design insights. The analytical results indicate that the determination of the three affecting parameters should be balanced to achieve a higher blast resistance in designing the EPC beam.


Introduction


External prestressing is a technique in which concrete structural members are prestressed longitudinally using tendons located entirely outside the concrete section. This technique is widely used to strengthen or rehabilitate existing concrete structures and in the construction of new concrete structures because of its superiority compared with other conventional prestressing techniques [1]. The advantages of external prestressing tendon systems include their easier tendon layout and placement, better corrosion protection, and significant contribution to restricting the deflection of long-span structures [2]. Furthermore, externally prestressed reinforced concrete (EPC) structures can potentially resist explosion, and are therefore used in key civil infrastructure, particularly in long-span concrete structures. Because of the ubiquity and importance of the external prestressing technique, the associated static behaviors have been intensively studied, including in engineering applications. The use of external prestressed tendons increases the load-carrying performance of beam components, which has been confirmed both theoretically and experimentally [3–7]. The load-bearing capacity is influenced by several factors, researchers have paid much attention to study the effects of these factors. Aparicio et al. [8] tested five monolithic and three segmental EPC beams in bending failure and in combined bending and shear failure. They observed that reducing the length of the tendon will increase the ultimate load-bearing capacity. Lou et al. [9] and El-Ariss [10] studied the flexural behavior of EPC beams, the results showed that high span-to-depth ratios led to a significant decrease in the eccentricity and therefore resulted in reduced rigidity and lower flexural capacity. The setting of the external tendons has a great influence on the load-bearing capacity of structures. Ghallab and Beeby [11] found that the ultimate stress in the external tendon was slightly affected by the internal bonded steel ratio, and was significantly affected by the value of the prestress, the number of deviators, the concrete strength, and the ratio of the distance between deviators to the span. Cao et al.

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