Research Papers
Elongation of reinforced concrete beam-columns with and without slab
A P McBride - University of Auckland
The elongation of reinforced concrete beams is investigated. Previous research where elongation has been observed is summarised. Two three-bay, single-storey beam-column units were designed according to the requirements of 3101 (1982). A scale factor of one third was used for the units. The two units were identical except that the first unit contained a cast insitu slab. Each unit was tested under displacement controlled, inelastic cyclic conditions so that the effect of the slab on the behaviour of the beam-column unit could be determined. These tests showed that the presence of the slab had no significant effect on the elongation of the unit. Secondary effects arising from elongation were observed and accounted for. In addition, the first unit was also used to illustrate the effective width of the slab contribution to the flexural strength of the beam. It was found that the requirements of 3101 (1982) were likely to underestimate this contribution to strength.
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