Abstract
This paper investigates numerically and experimentally the performance of reinforced concrete (RC) beam with unequal depths subjected to combined bending and shear. Such beams can geometrically be considered for unleveled reinforced concrete (RC) floor slab-beam system. However, it may generate critical disturbances in stress flow at the re-entrant corner (i.e. location of drop in beam depth). This research investigates the use of shear reinforcement and geometric properties to enhance cracking characteristics, yielding, ultimate load-carrying capacity, and exhibiting ductile failure mode. Ten reinforced concrete (RC) beams were constructed and tested experimentally considering the following key parameters: recess length, depth of smaller beam nib, and amount and layout of shear reinforcement at re-entrant corner. Finite element analysis (FEA) with material non-linearity was conducted in two RC beams that were tested experimentally to validate the computer modelling. The FEA models were then extended to conduct a parametric study to investigate the influence of geometric parameters (beam shape and width) and amount and arrangement of shear reinforcement on the structural response. Results confirmed that geometric properties and ratio of shear reinforcement at the re-entrant region significantly affect the behavior of reinforced concrete beam with unequal depths in terms of first cracking, yielding level, ultimate load carrying capacity and mode of failure.
Highlights
Reinforced concrete (RC) beams with constant depth are commonly employed in reinforced concrete (RC) structures
Few researchers investigated the effect of span-to-depth ratio and shear span-to-depth ratio on the shear strength of concrete beams including the D-regions and dapped ends (Hu and Wu 2018; Choi et al 2018; Qeshta et al Hamoda et al Int J Concr Struct Mater (2019) 13:55
5 Conclusion This paper investigates the behavior of RC beam with unequal depths in the form of cracking load, yield load, ultimate carrying capacity and crack pattern
Summary
Reinforced concrete (RC) beams with constant depth are commonly employed in RC structures. Another type of concrete beam with unequal depth is the one used in precast concrete beams and girders at their supports which is referred to as “dapped-end beams” (Hawileh et al 2017). Such beam configuration is outside the scope of the current research. Few researchers investigated the effect of span-to-depth ratio and shear span-to-depth ratio on the shear strength of concrete beams including the D-regions and dapped ends
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