1. INTRODUCTION QUAY STRUCTURES ARE CATEGORIZED INTO SOME WIDESPREAD SYSTEMS: PILE AND DECK, SOLDIER PILE, AND GRAVITY QUAYWALLS. THE SOLDIER PILE QUAYWALL IS CONSIDERED AS THE BASE CASE FOR THE SHAHID BEHESHTI PORT DEVELOPMENT PROJECT. ANOTHER ALTERNATIVE, HOWEVER, IS THE BLOCK TYPE QUAYWALL WHOSE SEISMIC PERFORMANCE IS DISCUSSED IN THIS PAPER.