پیوندهای مفید
آمار
| تعداد نشریات | 8 |
| تعداد شمارهها | 435 |
| تعداد مقالات | 5,634 |
| تعداد مشاهده مقاله | 7,427,849 |
| تعداد دریافت فایل اصل مقاله | 6,215,919 |
Experimental Investigation of the Effect of Hybrid fibers on Lightweight Concrete Beams Reinforced with GFRP Bars | ||
| AUT Journal of Civil Engineering | ||
| مقاله 11، دوره 3، شماره 2، اسفند 2019، صفحه 233-242 اصل مقاله (742.39 K) | ||
| نوع مقاله: Research Article | ||
| شناسه دیجیتال (DOI): 10.22060/ajce.2019.15474.5542 | ||
| نویسندگان | ||
| seyedehsan vakili1؛ peyman homami* 2؛ M. Reza esfahani3 | ||
| 1PhD Student, Department of Civil Engineering, Kharazmi University, Tehran, Iran | ||
| 2Kharazmi University | ||
| 3Ferdowsi University of Mashhad | ||
| چکیده | ||
| The main purpose of this study investigated the effects of hybrid use of micro glass fiber (GF), micro polypropylene fiber (PF) and macro steel fiber (SF) on the flexural capacity, energy absorption, ultimate load carrying, failure mode and ductility behavior of lightweight aggregate concrete (LWC) beams reinforced with glass fiber reinforced polymer (GFRP) bars. A total of eight beams with a rectangular cross-section and 100 mm wide × 200 mm deep × 1500 mm long, were cast and tested up to failure under four-point bending. The correction factor (φ) calculated compared with American design codes of ACI 440.1R-06 and ISIS design manual No. 3. The φ factor for beams made of hybrid PF, SF into the LWC mixes (PSLWC) and reinforced with 0.9 ρfb; where ρfb is the balanced reinforcement ratio of the GFRP bars is approximately 1.38 times to the φ factor for beams made of hybrid GF, PF into the LWC mixes (GPLWC) and hybrid GF, SF added into the LWC mixes (GSLWC) that reinforced with 0.9 ρfb. The results experimental showed the ultimate load-carrying capacity increased 5% to 49%, with increasing reinforcement ratio from 0.9 ρfb to 1.4 ρfb. According to experimental observations, failure modes in the beams made of GPLWC, GSLWC and PSLWC also reinforced with 0.9 ρfb failure modes coincides with the failure modes ACI 440.1R-06. The results indicate that the use of GPLWC, GSLWC and PSLWC at beams reinforced with GFRP bars improves the flexural capacity, ultimate load carrying, energy absorption and ductility. | ||
| کلیدواژهها | ||
| Hybrid Fibers؛ Macro Steel Fiber؛ Micro Polypropylene and Glass Fiber؛ Lightweight Aggregate Concrete (LWC)؛ GFRP Bars | ||
| مراجع | ||
|
[1] Committee, A. (2006). “Guide for the design and construction of structural concrete reinforced with FRP bars.” 440.1 R.
[2] Shafigh, P., et al. (2011). “A new method of producing high strength oil palm shell lightweight concrete.” Materials & Design 32(10): 4839-4843.
[3] Ma, H., et al. (2013). “Study on mechanical properties of steel fiber reinforced autoclaved lightweight shell- aggregate concrete.” Materials & Design (1980-2015) 52: 565-571.
[4] Oktay H., et al. (2015). “Mechanical and thermophysical properties of lightweight aggregate concretes.” Constr. Build. Mater. 96: 217-225.
[5] Soner G., (2018). “The effect of polyamide fibers on the strength and toughness properties.” Constr. Build. Mater. 173: 394–402.
[6] Bogas, J. A. and A. Gomes (2015). “Non-steady- state accelerated chloride penetration resistance of structural lightweight aggregate concrete.” Cement and Concrete Composites 60: 111-122.
[7] Bilodeau, A., et al. (2004). “Optimization of the type and amount of polypropylene fibres for preventing the spalling of lightweight concrete subjected to hydrocarbon fire.” Cement and Concrete Composites 26(2): 163-174.
[8] Libre, N. A., et al. (2011). “Mechanical properties of hybrid fiber reinforced lightweight aggregate concrete made with natural pumice.” Construction and Building Materials 25(5): 2458-2464.
[9] Campione G., and L. La Mendola, (2004). “Behavior in compression of lightweight fiber reinforced concrete confined with transverse steel reinforcement.” Cem. Concr. Compos. 26(6): 645-656.
[10] Domaga-a, L. (2011). “Modification of properties of structural lightweight concrete with steel fibers.” Journal of Civil Engineering and Management 17(1): 36-44.
[11] Chen, B. and J. Liu (2005). “Contribution of hybrid fibers on the properties of the high-strength lightweight concrete having good workability.” Cement and Concrete Research 35(5): 913-917.
[12] Li, J., et al. (2017). “Comparison of flexural property between high performance polypropylene fiber reinforced lightweight aggregate concrete and steel fiber reinforced lightweight aggregate concrete.” Construction and Building Materials 157: 729-736.
[13] Qian, C. and P. Stroeven (2000). “Development of hybrid polypropylene-steel fiber-reinforced concrete Cement and Concrete Research 30(1): 63-69.
[14] Khaloo, A., et al. (2014). “Mechanical performance of self-compacting concrete reinforced with steel fibers.” Construction and Building Materials 51: 179- 186.
[15] Hamoush, S., et al. (2010). “Deflection behavior of concrete beams reinforced with PVA micro-fibers.” Construction and Building Materials 24(11): 2285- 2293.
[16] Zhu, H., et al. (2018). “Flexural behavior of partially fiber-reinforced high-strength concrete beams reinforced with FRP bars.” Construction and Building Materials 161: 587-597.
[17] Jun Li, J., et al. (2017). “Investigation on flexural toughness evaluation method of steel fiber reinforced lightweight aggregate concrete.” Construction and Building Materials 131: 449-458.
[18] Lee J.-H., et al., (2017). “Flexural capacity of fiber reinforced concrete with a consideration of concrete strength and fiber content” Constr. Build. Mater. 138: 222-231.
[19] Iran), I. I. o. S. a. I. R. o. (2000). “Specification for Portland cement.” ISIRI Number 389.
[20] Standard, A. (2015). “Standard Test Method for Slump of Hydraulic-Cement Concrete.” ASTM Annual Book of ASTM Standards.
[21] Standard, BS. (1983). “Method for determination of compressive strength of concrete cubes concrete specimens.” BS 1881-116:1983.
[22] Taly, N., et al. (2006). Reinforced concrete design with FRP composites, CRC press.
[23] Kakizawa, T., et al. (1993). “Flexural behavior and energy absorption of carbon FRP reinforced concrete beams.” Special Publication 138: 585-598.
[24] Canada, Intelligent Sensing for Innovative Structures (ISIS), (2007). “Design Manual No. 3. Reinforcing concrete structures with fiber reinforced polymers.” | ||
|
آمار تعداد مشاهده مقاله: 966 تعداد دریافت فایل اصل مقاله: 511 |
||