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Effect of tension and compression reinforcements on the serviceability of HSC beams with relatively small shear span to depth ratio
Joint Authors
Maghsudi, Ali Akbar
Akbarzadeh, Bengar Habib
Source
The Arabian Journal for Science and Engineering. Section B, Engineering
Issue
Vol. 32, Issue 2B (31 Oct. 2007), pp.219-238, 20 p.
Publisher
King Fahd University of Petroleum and Minerals
Publication Date
2007-10-31
Country of Publication
Saudi Arabia
No. of Pages
20
Main Subjects
Topics
Abstract AR
قمنا بتحضير 12 عمودا من الخرسانة عالية الأداء ذات عدة نسب من ρ و ρ' (نسب مختلفة من حديد الشد و الانضغاط), و ذلك لدراسة و استقصاء أداء و خدمة هذه الأعمدة عند الانثناء. و قد قمنا في أثناء الاختبار بقياس إجهاد الحديد و الخرسانة و الانحراف و عرض الشقوق على امتداد الأعمدة و من النتائج التجريبية قمنا بتحديد عزم القصور للشقوق (Icr) لأعمدة HSC, و من ثم مقارنتها ببعض النتائج النظرية.
كما قمنا بقياس عرض الشقوق و تحققنا من إمكانية تطبيق معادلات و برامج CSA و BS و ACI للخرسانة العادية (NSC) كما طبقنا ذلك للخرسانة (HSC).
و قد كانت القيم التجريبية لـ (Ics)exp للأعمدة الخرسانية (HSC) أقل من القيم النظرية (Ics)th, و ذلك لكافة البرامج المستخدمة.
و استنتجنا أنه يمكن تحسين أداء الخرسانة المقواة باستخدام خرسانة ذات قوة عالية.
و على العموم فإن معظم الأعمدة (HSC) التي تم اختبارها عند ثلاث قيم لعرض الشقوق (0.1 و 0.2 و 0.3 ملم) و استخدام معادلة ACI أدى إلى نسبة تنبؤ قدرها 50% لعرض الشقوق, لكن نتائج معادلة BS كانت محافظة أكثر من نتائج ACI.
أما استخدام معادلة CSA للأعمدة ذات نسبة تقوية عالية و منخفضة فقد أدى إلى نتائج أكثر محافظة و قيم أقرب لقيم CSA النهائية.
كما كان مقدار الانحراف الابتدائي لحديد التسلح الأفقي 9 ملم, و هذا دلالة ممتازة على جودة أداء الانحراف لخرسانة HSC.
Abstract EN
To investigate the serviceability performance of High-Strength Concrete (HSC) beams, 12 beams (L = 2 m, b = 0.
2 m, h = 0.
3 m and shear span to depth ratio of 1.
8) with different ratios of ρ and ρ' (percentage of tensile and compressive steel) were cast and tested under bending.
During the test, concrete and steel strains, deflections, and crack widths were measured at different locations along each beam.
Based on the experimental readings and observations, the cracked moment of inertia (Icr) of HSC beams was determined and the results were compared with some selective theoretical methods.
Also, the flexural crack width of the beams was measured and the applicability of ACI, BS, and CSA code for normal strength concrete (NSC) was verified for HSC beams tested.
The experimental (Icr)exp values of HSC beams were lower than the theoretical (Icr)th values from different codes.
It was concluded that, the serviceability and post serviceability performance of reinforced concrete structures can be improved using high strength concrete.
In general, for almost all HSC tested beams at three crack width (0.
1, 0.
2, 0.
3 mm) ; the use of ACI equation led to predict 50% of the crack width conservatively (the ratio of ((ωcr)th/(ωcr)exp) is greater than unity) but the results of the BS equation are conservative while compare to the ACI equation.
The use of the CSA equation for the beams of higher and lower reinforcement ratio, caused a more conservative, and a closer value respectively, to limiting values of CSA.The deflection at initial steel horizontal yield plateau, is less than 9 mm, which is a sign of excellent deflection performance of HSC beams.
American Psychological Association (APA)
Maghsudi, Ali Akbar& Akbarzadeh, Bengar Habib. 2007. Effect of tension and compression reinforcements on the serviceability of HSC beams with relatively small shear span to depth ratio. The Arabian Journal for Science and Engineering. Section B, Engineering،Vol. 32, no. 2B, pp.219-238.
https://search.emarefa.net/detail/BIM-344520
Modern Language Association (MLA)
Maghsudi, Ali Akbar& Akbarzadeh, Bengar Habib. Effect of tension and compression reinforcements on the serviceability of HSC beams with relatively small shear span to depth ratio. The Arabian Journal for Science and Engineering. Section B, Engineering Vol. 32, no. 2B (Oct. 2007), pp.219-238.
https://search.emarefa.net/detail/BIM-344520
American Medical Association (AMA)
Maghsudi, Ali Akbar& Akbarzadeh, Bengar Habib. Effect of tension and compression reinforcements on the serviceability of HSC beams with relatively small shear span to depth ratio. The Arabian Journal for Science and Engineering. Section B, Engineering. 2007. Vol. 32, no. 2B, pp.219-238.
https://search.emarefa.net/detail/BIM-344520
Data Type
Journal Articles
Language
English
Notes
Includes appendicx : p. 237-238
Record ID
BIM-344520