Abstract
A new type of a breakwater caisson made of composite members and reinforced concrete members is now under construction. This caisson called double cells is equipped by wave dissipation blocks. Several kinds of joints exist in the caisson where tensile force due to waves is dominant. To confirm mechanical properties of these joints, static pure-tensile loading tests are carried out. Through the loading tests, the joints have enough strength capacity for design load. However dislocation between steel plate and concrete is large when reinforcement for joints is not arranged.
