Hi Miyamoto,
There is a pressure thrust exist in tied expansion joint also, but that presusre thrust is taken care by the tie rods, so generally it woun't have any effect on your calcualtion.

Tie Rods: - are the devices which usually in the form of rods or bars, attached to the expansion joint assembly whose primary function is to continuously restrain the full pressure thrust during normal operation while permitting only lateral deflection. Angular rotation can be accommodated only if two tie rods are used and located 90 degrees opposed to the direction of rotation. I hope this will help you!!

Regards,
R.K.