Estimating of Torsional Capacity of Self Compacting concrete Beams

Document Type : Research Article

Authors

1 Assistant Professor, Department of Civil Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran

2 MSc Student, Department of Civil Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran

Abstract

This paper expresses the effects of silica fume, super plasticizer and GFRP on the torsional strength of self-compacting concrete (SCC) beams. SCC and control concrete mix designs in this study are based on 20 different mixes with the water-cement ratios of 0.35 and 0.45. For Torsion tests, beams with the dimensions of 40 × 10 × 10 cm were casted. To determine the compressive strength and Pundit tests, Cubic specimens with the dimensions of 10 × 10 × 10 cm and standard cylindrical specimens with the dimensions of 15 × 30 cm height were made and cured for 28 days before testing.  The obtained experimental results show that the effect of silica fume in w/c=0.45 was more than the other on torsional capacity was. The torsional strength of concrete beams with GFRP was increased about 43%. The error of estimating the compressive strength of concrete by pundit test was 2%. In addition, the existing equations for estimating the torsional strength of ordinary concrete can be used for Self Compacting concrete.

Keywords

References

[1]اس. اچ. احمد، اس. پی. شاه،”بتنهای توانمند و کاربرد آنها“، ترجمه دکتر موسی مظلوم دکتر علی اکبر - رمضانیانسور، دانشگاه شهید رجایی، تهران، 1383 .
[2]طاحونی، شاپور،”طراحی ساختمانهای بتن مسلح بر مبنای آئین نامه بتن ایران آبا“، انتشارات دانشگاه تهران، تهران، – 1390 .
[3]دفتر تدوین و ترویج مقررات ملی ساختمان،”مقررات ملی ساختمان، مبحث نهم، طرح و اجرای ساختمانهای بتن آرمه“،وزارت مسکن و شهرسازی،388 .
[4]سازمان مدیریت و برنامه ریزی کشور،”نشریه شماره  126 راهنمای آئین نامه بتن ایران آبا“، معاونت امورفنی، دفتر امور فنی و تدوین معیارها، انتشارات سازمان مدیریت و برنامه ریزی.
[5]رنجبر، اسدالله،”بررسی مدول گسیختگی بتن خود متراکم“،پایان نامه کارشناسی ارشد، دانشکده عمران، دانشگاه تربیت دبیر شهید رجایی، تهران، 1390 [6]شکرچی زاده، محمد و نیکلاس علی لیبر، مهرداد ماهوتیان،علیرضا محبی، و یکتا بهرادی،”آزمایشهای بتن خودتراکم و تفسیر نتایج بدست آمده در برآورد پایداری بتن تازه“، اولین کارگاه تخصصی بتن خودتراکم، دانشگاه تهران، تهران، 1385 .
[7] Shekarchi, M., Liber, N. A., Khoshnazar, R., Bagherzadeh chehreh, A., Babanezahad Mamaghani, S. K., “Highly flowable concrete made with different aggregate gradation”, Proceeding of the International Symposium on HSC- HPC Conference, Japan, 2008.
[8] Nunes S., Figueiras H., Oliveira P. M. Coutinho J. S. and Figueiras J., “A methodology to assess robustness of SCC mixtures”, Cement ans Concrete Research, 36, pp. 2115- 2122, 2006.
[9] Chalioris, CE, “Tests and analysis of reinforced concrete beams under torsion retrofitted with FRP strips”, In Proceedings 13th computational
methods and experimental measurements, pp. 633– 42, 2007.
[10] Hii AKY, Al-Mahaidi R, “An experimental and numerical investigation on torsional strengthening of solid and box-section RC beams using CFRP laminates”, Composite Structures,75, pp. 213– 21, 2006.
[11] Hii AKY, Al-Mahaidi R, “Torsional capacity of CFRP strengthened reinforced concrete beams”, Journal of Composites for Construction, 11(1), pp. 71– 80, 2007.
[12] Jing M, Raongjant W, Li Z, “Torsional strengthening of reinforced concrete box beams using carbon fiber reinforced polymer”, Composite Structures,78, pp. 264– 70, 2007.
[13] Khaloo, A. R., M. R. Hosuseinian, “Evaluation of properties of silica fume for use in concrete”, International Conference on concrete, Dundee, Scotland, 1999.
[14] Khayat, K. H., K. Manai, A. Trudel, “In situ mechanical properties of wall elements using self- compacting concrete”, ACI Materials JOURNAL, pp. 491- 500, 1997.
[15] Duval, R., E. H. Kardi, “Influence of silica fume on the workability And the compressive strength of high-performance concrete”, cement and concrete research Journal, Vol. 28, Issue. 4, pp. 533- 547, 1998.
[16] Emadi, A., Liber, N. A., Mehdipour, I., Vahdani, M., Dara, S, “SCC mixture with different aggregate gradation and limestone powder”, 5th international RILEM Symposium on Self-Compacting Concrete, Ghent, Belgium, pp. 155- 162, 2007.
[17] kamura, H, “Self- Compacting high performance Concrete”, Concrete International, pp. 50- 54, 1997.
[18] Koehler E. P., Fowler D. W, “Summary of concrete workability Test methods”, ICAR report, pp. 39- 40, 2003.
[19] Chen JF., Teng JG, “Shear capacity of FRP-strengthened RD beams FRP debonding”, Constr Build Mater, 17 pp. 27– 41, 2003.
[20] Tsonos AG., Stylianidis KH, “Pre-earthquake and post-earthquake strengthening of R/C structural  subassemblages using GFRP (in Greek)”, Sci Rev Ktirio, pp.41- 50, 2001.
[21] Ghobarah A., Ghorbel MN., Chidiac SE, “Upgrading torsional resistance of reinforced concrete beams using fiber-reinforced polymer”, J Compos Constr ASCE, pp. 63- 257, 2002.
[22] Chalioris CE, “Experimental study of the torsion of reinforced concrete members”, Struct Eng Mech, pp. 37- 713, 2006.
[23] Jing M., Grunberg J, “Mechanical Analysis of reinforced concrete box beam strengthened with carbon fiber sheets under combined actions”, Compos Struct, pp. 94- 488, 2006.
[24] Karayannis CG, “Nonlinear analysis and tests of steel-fiber concrete beams in torsion”, Struct Eng Mech, pp. 38- 323, 2000.
[25] Karayannis CG., Chalioris CE; “Strength of prestressed concrete beams in torsion”, Struct Eng Mech, pp. 80– 165, 2000.
[26] Gunneswara Rao TD., Rama Seshu D, “
Torsional response of fibrous reinforced concrete members: Effect of single type of reinforcement”, Constr Build Mater, 92– 187, 2006.

Files

Share

How to cite

Statistics