Abstract




 
   

IJE TRANSACTIONS A: Basics Vol. 32, No. 4 (April 2019) 474-483    Article in Press

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  A SIMPLE APPROACH TO PREDICT THE SHEAR CAPACITY AND FAILURE MODE OF FIX-ENDED REINFORCED CONCRETE DEEP BEAMS BASED ON EXPERIMENTAL STUDY
 
A. Arabzadeh and R. Hizaji
 
( Received: January 07, 2019 – Accepted: March 07, 2019 )
 
 

Abstract    Reinforced Concrete (RC) deep beams are commonly used in structural design to transfer vertical loads when there is a vertical discontinuity in the load path. Due to their deep geometry, the force distribution within the RC deep beams is very different than the RC shallow beams. There are some strut and tie model (STM) already been developed for RC deep beams. However, most of these models are developed for RC deep beams with the simply supported boundary condition, which do not apply for RC deep beams with the fix-ended condition. In this paper, five fixed-end RC deep beams have been tested experimentally which were subjected to monotonic and cyclic loads. Also, a simple STM was proposed to simulate the load capacity and failure mode of fix-ended RC deep beams. The proposed STM has the main strut and sub struts to simulate the force distribution within the RC deep beams. This STM were verified using five fixed-end RC deep beams subjected to monotonic and cyclic loads and compared to the response of 31 additional independent experimental tests. The result shows the newly proposed STM can simulate the load capacity and failure mode of fix-ended RC deep beams very well.

 

Keywords    Fix-ended Deep Beam; Strut and Tie Model; Shear Failure; Cyclic Load

 

چکیده   

تیرهای عمیق بتن عمیق بتن مسلح عمدتا در طراحی سازه هایی که در مسیر انتقال قائم بار، ناپیوستگی وجود دارد، استفاده می شود. با توجه به هندسه عمیق آنها، توزیع نیرو درون تیرهای عمیق بسیار متفاوت از تیرهای معمولی است. در چند دهه اخیر چندین مدل خرپایی برای تحلیل این تیرها ارائه شده است که اغلب آنها برای تیرهای عمیق دو سرساده قابل استفاده است و برای نیرهای عمیق دو سرگیردار مناسب نیستند. در این مقاله، پنج تیرعمیق دو سرگیردار بتنی تحت بارهای یکنوا و چرخه‌ای آزمایش شده اند. همچنین، یک مدل خرپایی ساده برای پیش بینی ظرفیت باربری و حالت شکست این نوع تیرها ارائه شده است. مدل پیشنهاد شده دارای دستکهای فشاری اصلی و فرعی جهت شبیه سازی توزیع نیرو درون تیرهای عمیق دو سرگیردار می باشد. برای اعتبارسنجی مدل پیشنهادی علاوه بر نتایج نمونه های آزمایش شده در این مقاله، از نتایج 31 آزمایشهای موجود در ادبیات استفاده شده است. نتایج این آزمایشها نشان می دهد که مدل جدید پیشنهاد شده می تواند ظرفیت بارگذاری و حالت شکست تیرهای عمیق دو سرگیردار را با دقت بسیار خوبی پیش بینی نماید.

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