Can I connect TTL gates directly to the address bus of a Z80 CPU?
When the Z80 was young, 74LS was the commonly-used logic family.  You should be able to connect a few 74LS inputs (say 3 or 4) to each Z80 address line without problems.

If you really need to drive 14 74LS inputs from one Z80 output, you should probably add a buffer between the Z80 and your 14 inputs, so the Z80 only sees a single load on that output.