Beams in Shear - Unified Theory of Concrete Structures - page 374

V exp / V cal ratios of large beams using ACI method Figure 8.22

8.3.6.2 ACI and AASHTO Shear Design Methods

The V exp / V cal ratios of the 58 large specimens according to the ACI method (see Section

8.3.1.1) are plotted in Figure 8.22. The V exp / V cal ratios vary from 1.0 to about 2.0. Obviously,

the accuracy of the ACI method in predicting the shear strengths is not as good as the UH
method. This is because the ACI method is strongly influenced by the small and older test spec-
imens, while the UH method places more emphasis on the large and more recent specimens.
The V exp /

V cal ratios of the 58 large specimens according to the AASHTO method (see
Section 8.3.1.2) are plotted in Figure 8.23. The V exp / V cal ratios in this figure have very large

Figure 8.23 V exp / V cal ratios of large beams using AASHTO method