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17 Figure 15. Influence of concrete strength on shear capacity. useful for predicting the capacity for the types of members effort required to use these tools to obtain an evaluation of for which no experimental test data is available. Before the the shear capacity. Some of the most promising available use of any analytical tool, the accuracy and reliability of the tools are Response 2000 (15), ABAQUS (47), VecTor2, tool must first be assessed by making comparisons with DIANA (48), and ATENA (49). existing experimental test data. A further consideration is the 1.2.7 Design Cases A further way to evaluate design methods is to compare the required strengths of shear reinforcement (pv fy Av fy /bv s) by the different design methods for a large database of design cases. Ideally, these cases would represent the range and fre- quency of members built using the given design provisions. Comparing the required amount of shear reinforcement by dif- ferent design approaches for each design case can reveal where prospective provisions may be unconservative or overly con- servative. It is also useful to compare these required strengths of shear reinforcement ( pv fy) with the strength determined using analysis tools such as Response 2000. 2 Shear Strees, V/(bv d v) (MPa) 1.5 CSA 1994 As = 1.95% Experimental bw d 1 M/V = 0.635 m 0.5 ACI code 0 0 5 10 15 20 25 Axial Tension Stress, N/(bv dv) (MPa) Figure 16. Influence of axial compression on shear capacity. Figure 17. Influence of axial tension on shear capacity.