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Flexural behaviour of hookless plain bar reinforced concrete slab with pre-existing through-cracks
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DOI：10.1080/15732479.2026.2691756.png)
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Abstract
En 中文
In recent years, large-scale retrofitting of ageing infrastructure reinforced with plain bars has become increasingly common in Japan. A critical challenge during this process is the temporary hookless state of plain bars. However, research data on its mechanical behaviour is limited. To address this gap, this study investigates the flexural behaviour of a hookless plain bar reinforced concrete slab by conducting two sequential four-point bending tests in orthogonal directions on the same specimen. Multi-point strain gauges and displacement transducers were used to measure the plain bar strain and relative slip between plain bars and concrete. Measurements revealed that the loss of bond strength occurred progressively, and pre-existing through-cracks led to earlier plain bar slip. The peak load was reached when relative slip initiated in all monitored plain bars. Compared to theoretical flexural capacities calculated for deformed bars, the plain bar slab exhibited experimental capacities that were 18% lower in the first bending test and 35% lower in the second. The more pronounced reduction in the second test was likely exacerbated by pre-existing cracks and other experimental factors. These findings provide crucial data for the retrofitting design of existing plain bar reinforced concrete structures.
Keywords:
Bending test
flexural behaviour
flexural capacity
relative slip
hookless plain bar
concrete slab
pre-existing cracks
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