کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
266024 504341 2015 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of fibre aspect ratio on the torsional behaviour of steel fibre-reinforced normal weight concrete and lightweight concrete
ترجمه فارسی عنوان
اثر نسبت ابعاد فیبر به رفتار پیچشی فولاد فیبر تقویت شده وزن بتن سبک و سبک وزن بتن
کلمات کلیدی
بتن مسلح فیبری، بتن سبک، وزن معمولی، پوسته کف خرما، فیبر فولاد، تورفتگی
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات مهندسی ژئوتکنیک و زمین شناسی مهندسی
چکیده انگلیسی


• Steel fibre reinforcement compensated the weaker tensile strength of OPSC by producing tensile strength and brittleness ratio relative to the NWFRC mixes.
• OPSC produced a twist at failure of 0.143 rad/m, which was 280% of that of the NWC beam and hence showed better torsional ductility.
• The cracking torque, ultimate torque, ultimate twist, twist at failure and torsional toughness of OPSFRC beams were improved compared to the control OPSC.
• The addition of steel fibre significantly reduced the crack widths of both the NWFRC and OPSFRC specimens.

The emergence of torsion studies is attributed to the increasing demand for the aesthetic design of curved structural members; however, they are limited in respect of lightweight concrete. Oil Palm Shell Concrete (OPSC) has been researched in Malaysia, which is known to produce a sustainable lightweight concrete by using locally available oil palm shell waste. This study aims to compare the torsional behaviour between the normal weight concrete (NWC) and OPSC, and to investigate the effects of steel fibre of varying aspect ratio – 55, 65 and 80 – in both types of concrete. The results showed that OPSC is more ductile in torsion than the NWC beam, with a twist at failure 2.8 times that of NWC. The steel fibre reinforcement compensated the weak tensile strength of OPSC and enhanced the mechanical properties, torsional strength and ductility, toughness and crack resistance of the OPSFRC specimens. The effect of the aspect ratio is evident from the OPSFRC-80 mix reinforced with steel fibre of aspect ratio 80, which produced the highest ultimate torque, twist at failure and torsional toughness of 8.60 kN m, 0.179 rad/m and 1.074 kN m/m, respectively. In addition, equations are proposed to predict the cracking and ultimate torques to improve the torsion design of lightweight concrete.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Engineering Structures - Volume 101, 15 October 2015, Pages 24–33
نویسندگان
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