An experimental study on the flexural behavior of heavily steel reinforced beams with high-strength concrete

doi:10.1007/s11709-014-0237-y

Front Struc Civil Eng

2014, Vol. 8

Issue (1) : 46-56 https://doi.org/10.1007/s11709-014-0237-y

RESEARCH ARTICLE

An experimental study on the flexural behavior of heavily steel reinforced beams with high-strength concrete

Yasser SHARIFI¹(

), Ali Akbar MAGHSOUDI²

1. Department of Civil Engineering, Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran; 2. Department of Civil Engineering, Shahid Bahonar University of Kerman, Kerman, Iran

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Abstract

In recent years, an emerging technology termed high-strength concrete (HSC) has become popular in construction industry. Present study describes an experimental research on the behavior of high-strength concrete beams in ultimate and service state. Six simply supported beams were tested, by applying comprising two symmetric concentrated loads. Tests are reported in this study on the flexural behavior of high-strength reinforced concrete (HSRC) beams made with coarse and fine aggregate together with Microsilica. Test parameter considered includes effect of being compressive reinforcement. Based on the obtained results, the behavior of such members is more deeply reviewed. Also a comparison between theoretical and experimental results is reported here. The beams were made from concrete having compressive strength of 66.81–77.72 N/mm² and percentage reinforcement ratio (ρ/ρ_b) in the range of 0.56% – 1.20%. The ultimate moment for the tested beams was found to be in a good agreement with that of the predicted ultimate moment based on ACI 318-11, ACI 363 and CSA-04 provisions. The predicted deflection based classical formulation based on code provisions for serviceability requirements is found to underestimate the maximum deflection of HSC reinforced beams at service load.

Keywords high-strength concrete (HSC) members flexural behavior reinforced concrete experimental results ultimate moment

Corresponding Author(s): SHARIFI Yasser,Email:y.sharifi@vru.ac.ir

Issue Date: 05 March 2014

Cite this article:

Yasser SHARIFI,Ali Akbar MAGHSOUDI. An experimental study on the flexural behavior of heavily steel reinforced beams with high-strength concrete[J]. Front Struc Civil Eng, 2014, 8(1): 46-56.

URL:

https://academic.hep.com.cn/fsce/EN/10.1007/s11709-014-0237-y
https://academic.hep.com.cn/fsce/EN/Y2014/V8/I1/46

Tab.1 Testing program detail of tested beam [,]

Tab.2 Concrete mix proportion

Fig.1 (a) Details of tested beam; (b) details of sections for beams B6 and BC6; (c) details of sections for beams B7 and BC7; (d) details of sections for beams B8 and BC8; (e) testing arrangement

Fig.2 (a) Crack propagation of beam B6 under load; (b) collapse of beam BC6 under Load; (c) crack propagation of beam BC7 under Load

Fig.3 (a) Load-tensile strain of beams BC6-BC8 in midspan; (b) load-compressive strain of beams BC6-BC8 in midspan

Fig.4 Beam cross section and strain distribution

Fig.5 Behavior of neutral axis depth under load

Tab.3 Experimental neutral axis depth measured at cracking, yield and ultimate loads

Tab.4 Experimental and theoretical bending moment of tested beams

Tab.5 Experimental measurements and ultimate curvature of tested beams

Fig.6 Deflection beams curves of midspan load

Fig.7 Curvature beams curves of midspan moment

Tab.6 Experimental and theoretical cracking bending moment of tested beams

Fig.8 Modules of rupture versus compressive strength of concrete of tested beams

Tab.7 Experimental and predicted deflection at service load

Tab.8 Experimental and theoretical cracked moment of inertia

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