Beams in Shear - Unified Theory of Concrete Structures - page 373

V exp / V cal ratios of beams using UH method Figure 8.20

than 500 mm (20 in.) as large, and those less than 500 mm (20 in.) as small. The V exp / V cal

ratios of the 58 large specimens (Mattock and Kaar, 1961; Lyngberg, 1976; Robertson and
Duranni, 1987; Kaufman and Ramirez, 1988; Rangan, 1991; Shahawy and Batchelor, 1996;
Ma et al. 2000; and Laskar et al. 2006) are then plotted in Figure 8.21. It can be seen that
the V exp /

V cal ratios of large specimens vary from 1.0 to about 1.5, much less than the scatter
observed in Figure 8.20. Apparently, the strength ratios of the 90 small specimens are more
conservative and have larger scatter. Besides the effect of specimen size on the shear strength,
the wide scatter of V exp /

V cal ratios is anticipated, because the smaller beams tend to be those
tested earlier, while the larger beams were tested more recently.

Figure 8.21 V exp / V cal ratios of large beams using UH method