مقاله انگلیسی بازیابی تغییر شکل تیرهای بتن مسلح ساخته شده با سنگدانه های درشت بازیافتی
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مقاله انگلیسی بازیابی تغییر شکل تیرهای بتن مسلح ساخته شده با سنگدانه های درشت بازیافتی

عنوان فارسی مقاله: بازیابی تغییر شکل تیرهای بتن مسلح ساخته شده با سنگدانه های درشت بازیافتی
عنوان انگلیسی مقاله: Deformation recovery of reinforced concrete beams made with recycled coarse aggregates
مجله/کنفرانس: سازه های مهندسی - Engineering Structures
رشته های تحصیلی مرتبط: مهندسی عمران
گرایش های تحصیلی مرتبط: سازه، زلزله، مدیریت ساخت
کلمات کلیدی فارسی: بتن سنگدانه بازیافتی، عملکرد خمشی، بازیابی تغییر شکل، قابلیت بازیابی، بازیابی انحراف طولانی مدت، تجزیه و تحلیل ترک خورده، سختی بتن
کلمات کلیدی انگلیسی: Recycled aggregate concrete - Flexural performance - Deformation recovery - Recoverability - Long-term deflection recovery - Cracked analysis - Concrete stiffness
نوع نگارش مقاله: مقاله پژوهشی (Research Article)
نمایه: Scopus - Master Journals List - JCR
شناسه دیجیتال (DOI): https://doi.org/10.1016/j.engstruct.2021.113482
دانشگاه: Department of Civil Engineering, Universidade da Coruna, Spain
ناشر: الزویر - Elsevier
نوع ارائه مقاله: ژورنال
نوع مقاله: ISI
سال انتشار مقاله: 2022
ایمپکت فاکتور: 4.773 در سال 2020
شاخص H_index: 141 در سال 2021
شاخص SJR: 1.567 در سال 2020
شناسه ISSN: 0141-0296
شاخص Quartile (چارک): Q1 در سال 2020
فرمت مقاله انگلیسی: PDF
تعداد صفحات مقاله انگلیسی: 13
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
آیا این مقاله فرضیه دارد: ندارد
کد محصول: E15833
رفرنس: دارای رفرنس در داخل متن و انتهای مقاله
فهرست مطالب (انگلیسی)

Highlights


Abstract


Keywords


1. Introduction


2. Research significance and objectives


3. Experimental program


3.1. Concrete specimens


3.2. Test setup and instrumentation


3.3. Concrete properties and test parameters


4. Results and discussion


4.1. Concrete deformations: Strains and deflections


4.2. Recovery strains


4.3. Deflection recovery


4.4. Analysis of uncracked and cracked concrete beams


5. Conclusions


CRediT authorship contribution statement


Declaration of Competing Interest


Acknowledgments


References

بخشی از مقاله (انگلیسی)

Abstract


The purpose of this research is to analyse the long-term deformations of reinforced concrete beams made of recycled coarse aggregates (RCA), using four different replacement ratios, 0%, 20%, 50% and 100%. For said purpose, three different loading stages were carried out: firstly, loading and sustained load for 1300 days, secondly, unloading and recovery where the deformations were registered over a one year period, and lastly, testing the concrete beams up to failure in order to analyse the effect of recycled aggregates on pre-cracked concrete members. The results led to the analysis of deformations under sustained load, as well as those produced after removing the load and the performance of pre-cracked members, while identifying the effect of recycled coarse aggregates on concrete performance in terms of plastic deformation, recoverability and concrete stiffness, and also on structural design.


1. Introduction


In recent years, the use of construction and demolition waste as aggregates for structural concrete has been widely studied. Numerous authors have contributed to the increasing knowledge in this field, analysing the structural performance of recycled concrete and its properties, such as mechanical strength, modulus of elasticity, creep and shrinkage or durability [1], [2], [3]. As a result, several expressions and methods have been assessed for the design of structural concrete using recycled aggregates [4], [5], [6], [7], [8], [9], [10], [11], [12]. Most authors deal with the short and long-term behaviour of concrete while considering only the influence of creep and shrinkage [13], [14], [15] and very few include the ageing effect of concrete, its different cracking behaviour or its ability to recover from deformations after a load is varied or removed [16].


As common concrete structures are usually submitted to load variations during their service life, it is important to consider the effect of creep over time, including not only loading periods but also unloading the stages and the recoverability of concrete. As mentioned by Rossi et al. [17] understanding the behaviour of concrete structures is greatly simplified by the numerical modelling of their mechanical behaviour. However, progress needs to be made to predict the long-term behaviour of concrete with sufficient accuracy. In order to determine the deformational mechanism, it is also important to analyse the effect of cracking and residual strain i.e. the irreversible part of strain. Many factors influence deformation and the ability of concrete to recover after unloading. Once the hysteretic recovery has finished, the residual deformation can be defined as plastic deformation. Additionally, it can be assumed that concrete deformations under loading are mainly due to creep, especially for long periods of loading and therefore, the ability of deformations to recover after unloading is closely linked to creep recovery.

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