I think the idea that there's a specific rep range for strength is a misnomer. The whole 1-5 for strength, 6-12 for hypertrophy thing indicates that, in general, with more volume you'll build muscle and with more intensity you'll optimise your use of that muscle. When you look at programs like Coan's classic 12 week peak (working from 10's through to a 1RM), it's not as if the first half of the program isn't building strength, even though the strength produced will be seen most profoundly in the lower rep ranges at the end of the program.