If your input is really 20VAC, then the peak-to-peak voltage will be ~28.3v, and at the rated source load, you should see around 24.5v average on the cap C3.Here is the circuit attached what i have tested...
You show R1 as 11 Ohms. To get 1A current through R1 will require 11v. If you were trying to output 15v, there would be 1.363.. Amperes current flowing through R1.... and also tried with the 7815 regulator. Even though the during load regulation the output is decreasing to 8V and load current is 1A.
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