Unlike casanova88 I'm very familiar with the concept of workload (as are most college lifting coaches). It's sound but it does come with a few caveats.
First, you need to build your base and increase workload
slowly.
Second, if you'll be using proper workload increases it's easier to increase by using a back-off set than to increase reps every week.
Workload is indeed calculated by multiplying your reps, sets and weight as you did. But, if you're looking to increase workload you need to increase the total number. So in your case, the second week is lower and therefore your workload is lower. So that's not increasing your workload.
There are a few methods that you can use. If you can lift 110 for 6 reps here's what you can do. Week 1 you do a specific number of sets of 4 reps (say 4 sets). Week 2 you do 4 sets fo 5 reps. And finally, week 3 you do 4 sets of 6 reps. This will mean that your workload will increase from 1760 to 2200 to 2640. From there you can progress in one of two ways.
Do one type of wave-type loading: either increase the weight a little (115lbs perhaps) and do the same thing over again; or, start over again with doing 4 reps at 110 but do 5 sets instead. Both will increase your workload in time (and like I said, this is a
slow process).
Your workload shouldn't go up all the time (if it did everyone would be hella strong), but rather you should aim at getting increases for short periods of time, taking a step back and then trying to push things up again.
Also, there's a limit to how much workload anyone can tolerate. So don't try to push yours too high.