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Frontiers of Structural and Civil Engineering

ISSN 2095-2430

ISSN 2095-2449(Online)

CN 10-1023/X

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Front. Struct. Civ. Eng.    2015, Vol. 9 Issue (2) : 154-162    https://doi.org/10.1007/s11709-015-0296-8
RESEARCH ARTICLE
Experimental and statistical investigation of a new concrete-composite beam with encased polymer tube wrapped by FRP
Abdelmadjid SI SALEM(),Souad AIT TALEB,Kamal AIT TAHAR
Laboratory LaMoMS, the University Mouloud Mammeri of Tizi Ouzou, Tizi Ouzou 15000, Algeria
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Abstract

A new concrete-composite beam with high mechanical performances to weight ratio is developed in this study. The proposed design technique consists to embed a cylindrical polymer tube wrapped by a GFRP Jacket in the mechanically ineffective concrete tensile zone. An experimental investigation is carried out on composite beams under bending loads until failure to evaluate the flexural capacity and the corresponding failure mechanisms. Based on the experimental results, statistical and preliminary reliability analyses using the FORM method are performed to assess the safety margin of the new beam. The confrontation between test and simulation results shows a satisfactory agreement, and represents a promising revelation regarding the improvement in terms of strength and ductility of such design compared to conventional reinforced concrete beams with traditional one.
Keywords design      GFRP-Jacket      polymer tube      test      reliability analysis     
Corresponding Author(s): Abdelmadjid SI SALEM   
Online First Date: 16 June 2015    Issue Date: 30 June 2015
 Cite this article:   
Abdelmadjid SI SALEM,Souad AIT TALEB,Kamal AIT TAHAR. Experimental and statistical investigation of a new concrete-composite beam with encased polymer tube wrapped by FRP[J]. Front. Struct. Civ. Eng., 2015, 9(2): 154-162.
 URL:  
https://academic.hep.com.cn/fsce/EN/10.1007/s11709-015-0296-8
https://academic.hep.com.cn/fsce/EN/Y2015/V9/I2/154
Fig.1  Developed beam specimen. (a) Longitudinal view; (b) composite cross section (unit: mm)
Fig.2  Used composite materials for the experimental procedure. (a) GRFP fabric; (b) polymer tube wrapped by a GFRP Jacket
component amount/(kg·m–3)
cement CPJ 42.5 350
fine aggregate 824,36
course aggregate 1024,23
water/cement ratio 0,57
super plasticizer 5 L
Tab.1  Mix proportions of the used concrete
composite materials thickness /mm Young modulus/MPa tensile stress /MPa ultimate tensile strain/‰
GFRP fabric 1.00 82 000 1400 5.6
E-glass sheet 1.12 62 000 140 4.9
epoxy resin STR 0.97 2 800-3 200 35 2.2
polymer tube 2.00 2 400 21 10.4
steel bar / 210 000 235 10
Tab.2  Composite materials properties
Fig.3  Average stress–strain curves for various used composites
Fig.4  Experimental behavior of the polymer tube
specimens type initial crack load/kN ultimate load/kN initial crack load deflection/mm ultimate load deflection/mm failure mechanisms
mean standard mean standard mean standard mean standard
C-B 7.54 0.21 8.89 0.28 1.65 0.06 1.91 0.08 Brittle failure
C-T-B 5.32 0.83 7.23 0.33 1.34 0.09 1.67 0.11 Brittle failure a)
R-C-B 13.37 0.43 14.12 0.93 1.53 0.11 3.12 0.21 Flexural failure b)
C-C-B 20.51 0.95 21.41 0.74 1.81 0.13 5.32 0.13 Flexural & shear failure c)
Tab.3  Average test results of all specimens
Fig.5  Rupture loads and deflections for all tested beams
Fig.6  Confrontation of Load- mid-span deflection curves
Fig.7  Failure mechanisms of the concrete composite beams (C-C-Bs)
Fig.8  Failure mechanisms of the reference beams. (a) R-C-B; (b) C-T-B
tested specimens mean value /kN coefficient of variation/% associated P-value range of COV for a 95% of confidence interval/%
C-B 8.89 3.14% 0.98 ±4.47
C-T-B 7.23 4.56% 0.85 ±5.25
R-C-B 14.12 6.58% 0.48 ±14.01
C-C-B 21.41 3.45% 0.88 ±11.81
Tab.4  Random variables modeling of resisting loads
Fig.9  Superimposed Normal distribution of the generated sample for the resisting and acting load, corresponding to the C-C-B
Fig.10  Reliability index evolution as function the flexural capacity
Fig.11  Reliability index versus loads ratio
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