Experimental study on shear performance of reinforced concrete superposed beams with overlapping hoops

Document Type

Article

Publication Date

12-5-2015

Abstract

Eight superposed reinforced concrete beams were tested to study their shear failure modes, shear capacities, deformation characteristics and superposed interface slips affected by various stirrup forms, shear span ratios and stirrup ratios. The results indicate that generally the superposed beams with overlapping hoops have the same shear capacity and deformation characteristic under serviceability states as those of the beams with conventional closed stirrups. The failure modes of the beams having shear span ratio of 2.62 are slightly different, in terms of the interface slip, from those beams with conventional closed stirrups; while as for the beams having shear span ratio of 1.50, the failure modes are nearly the same. In order to reduce the composite surface sliding, the construction quality of the composite surface should be controlled strictly. The overlapping hoops can be applied to the superposed beams subjected to combined bending and shear, and the shear capacity of the superposed beams with overlapping hoops under monotonic loads can be calculated according to the Code for design of concrete structures GB 50010-2010.

Publication Source (Journal or Book title)

Jianzhu Jiegou Xuebao/Journal of Building Structures

First Page

286

Last Page

291

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