Experimental study on shear behavior of reinforced concrete beams with web horizontal reinforcement

doi:10.1007/s11709-014-0080-1

Front. Struct. Civ. Eng.

2014, Vol. 8

Issue (4) : 325-336 https://doi.org/10.1007/s11709-014-0080-1

RESEARCH ARTICLE

Experimental study on shear behavior of reinforced concrete beams with web horizontal reinforcement

Dong XU(

),Yu ZHAO,Chao LIU

Department of Bridge Engineering, Tongji University, Shanghai 200092, China

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Abstract

In determining the shear capacity of reinforced concrete beams, current codes do not provide any calculation method to evaluate the influence of web horizontal reinforcement, although they exist as structural reinforcements (or skin reinforcement). The present paper comprises results of 11 reinforced concrete beams in an effort to investigate the influence of web horizontal reinforcement on the shear behavior of reinforced concrete beams. The primary design variables are the shear-span-depth ratio, different reinforcement ratio of stirrups and web horizontal reinforcement. Influence of web horizontal reinforcement on crack patterns and failure mode was studied. It was found that web horizontal reinforcement can increase the shear capacity of the beams and restrain growth of inclined cracks effectively. Test results are very valuable, as very few references of shear tests can be found focusing on the effect of web horizontal reinforcement on the shear capacity of the beams.

Keywords reinforced concrete beam shear strength web horizontal reinforcement experiments

Corresponding Author(s): Dong XU

Online First Date: 12 December 2014 Issue Date: 12 January 2015

Cite this article:

Dong XU,Yu ZHAO,Chao LIU. Experimental study on shear behavior of reinforced concrete beams with web horizontal reinforcement[J]. Front. Struct. Civ. Eng., 2014, 8(4): 325-336.

URL:

https://academic.hep.com.cn/fsce/EN/10.1007/s11709-014-0080-1
https://academic.hep.com.cn/fsce/EN/Y2014/V8/I4/325

Tab.1 Details of the beam specimens

Fig.1 Elevation and cross section of beam specimens in series R40 (unit: mm)

Fig.2 Elevation and cross section of beam specimens in series R25. (a) R25-1/2; (b) R25-3/4 (unit: mm)

Fig.3 Elevation and cross section of beam specimens in series T40. (a) T40-1; (b) T40-2; (c) T40-3 (unit: mm)

Tab.2 Concrete composition and elasticity modulus

Tab.3 Properties of reinforcing bars

Fig.4 Instrumentations in test beams. (a) strain gauges attached to steel reinforcements; (b) strain gauges attached to concrete and LVDTs

Fig.5 Test layout

Fig.6 Crack patterns in test series R40. (a) R40-1; (b) R40-2; (c) R40-3; (d) R40-4

Fig.7 Crack patterns in test series R25. (a) R25-1; (b) R25-2; (c) R25-3; (d) R25-4

Fig.8 Crack patterns in test series T40. (a) T40-1; (b) T40-2; (c) ; (d) T40-3

Fig.9 Strain results of test beam R40-1. (a) strain gauges attached to horizontal reinforcement; (b) strain value

Fig.10 Strain results of test beams in Series T40. (a) strain gauge distribution in longitudinal flexural reinforcement; (b) relation between strain in longitudinal flexural reinforcement and applied load: Beam T40-1 only with stirrups; Beam T40-2 with grid reinforcement

Tab.4 Summary of different shear procedures

Tab.5 Comparisons between experimental results and theoretical predictions from different design procedures

Tab.6 Notations

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