پاسخ لرزه ای فریم های RC تحت بار چرخه ای با فرکانس پایین
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پاسخ لرزه ای فریم های RC تحت بار چرخه ای با فرکانس پایین

عنوان فارسی مقاله: تأثیر پرکننده‌های بنائی بر پاسخ لرزه ای فریم های RC تحت بار چرخه ای با فرکانس پایین
عنوان انگلیسی مقاله: Influence of masonry infills on seismic response of RC frames under low frequency cyclic load
مجله/کنفرانس: سازه های مهندسی - Engineering Structures
رشته های تحصیلی مرتبط: مهندسی عمران
گرایش های تحصیلی مرتبط: زلزله، مدیریت ساخت، سازه
کلمات کلیدی فارسی: پرکننده های بلوک های بتنی سبک اسفنجی (ALC)، فریم های RC، پاسخ لرزه ای، نیروی اندرکنش، پایه هم ارز
کلمات کلیدی انگلیسی: Aerated lightweight concrete (ALC) blocks infills، RC frames، Seismic response، Interaction force، Equivalent strut
نوع نگارش مقاله: مقاله پژوهشی (Research Article)
نمایه: Scopus - Master Journals List - JCR
شناسه دیجیتال (DOI): https://doi.org/10.1016/j.engstruct.2018.12.083
دانشگاه: School of Civil Engineering, Qingdao University of Technology, 11Fushun Rd, Qingdao 266033, China
ناشر: الزویر - Elsevier
نوع ارائه مقاله: ژورنال
نوع مقاله: ISI
سال انتشار مقاله: 2019
ایمپکت فاکتور: 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
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
کد محصول: E11499
رفرنس: دارای رفرنس در داخل متن و انتهای مقاله
فهرست انگلیسی مطالب

Abstract


1- Introduction


2- Experimental investigation


3- Seismic performance of frames


4- Analysis of test result


5- Conclusions and recommendations


References

نمونه متن انگلیسی مقاله

Abstract


This paper presents an investigation on the seismic behavior of four reinforced concrete (RC) frames. The study is focused on the effect of the Aerated Lightweight Concrete (ALC) blocks infills on the seismic performance of the RC frames and the interaction between infills and surrounding frames. Four RC frames include a control specimen, frame with full-filled infills, frame with large window openings, and frame with eccentric door openings. Based on the low frequency cyclic loading experiments, hysteretic dissipation ability, stiffness degradation, characteristic displacement and load, failure pattern, flexural moments of columns, effective slab width, required ratio of column-to-beam strength, and column shear force are experimentally investigated and analyzed. Tests results indicate that the strength, the initial stiffness and the area of the hysteretic loop at the same load step were influenced significantly by infills when compared with the frame without masonry infills. This effect was reduced due to the large openings in the frame with infills. The column and beam mixed hinges failure was observed in the frame without infills while shear failure appeared at column ends in frames with infills. The testing results also show that inflection points were shifted to columns top because of the infills. Column shear forces were increased significantly due to the diagonal strut effect. Recommendations on useful effective slab width, the required ratio of column-to-beam strength and the equivalent strut width are made to take masonry infills into consideration in design.


Introduction


Masonry infills are frequently used in reinforced concrete (RC) structures. Since they are normally considered as architectural elements, the role of infills is underestimated in design code [1-4]. Seismic damage investigation indicated that RC frames were damaged showing “strong beam-weak column” failure, shear failure, and joint failure, which went against the original design intention. During strong earthquakes, the majority of RC frames collapsed or suffered a soft story failure due to few infills in the first floor (Fig. 1) [5]. Disproportionate openings led to short-column shear failure (Fig. 2) [6]. These damages illustrate that the infills have a significant effect on the whole structure and cannot be ignored. Thus, more researches should be carried out to understand the role of infills during strong earthquakes. During the last few decades, experimental studies on RC frames with masonry infills under static loads were carried out. Around 1960s, Polyakov [7] and Holmes [8] first found that brick infills could increase the strength and stiffness of frames, which brought infills effect into the sight of researchers. In order to compare seismic performance of RC frames with different infill materials and load routines, Bertero [9] carried out quasi-static cyclic load and monotonic load tests of 1/3 scaled 3-1/2 stories frames, Bertero [9] pointed out that the initial lateral stiffness, maximum lateral resistance, and effective viscous damping coefficient of frames increased significantly due to the effect of infills. Zovkic [10] also pointed out that the seismic performance was greatly influenced by the material of the infills. Armin [11] considered other influence factors such as strength of infills with respect to bounding frames, panel aspect ratio and vertical loads.

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