The irrigation project of Abadan will supply fresh water through the three flat dams in the NW of the Persian Gulf. Circular cofferdam is located in the Bahmanshir River upstream in 2007. Cell dam and ship lock walls are constructed using sheet piling and Pipe-Pin-Micro (PPM) piles on the steel walls. Next step is required to design ship lock concrete bed. It should have compatible behavior with the sheet walls, micro piles and gelatin concrete. The main purpose is transfer the extra bending moment of waterway impact from sheet walls into the concrete bed. It is mentioned that steel walls and concrete bed will operate individually without any connections with each other. Also, tangency joints will resolve the problems such as structural bed connection and steel wall thermal enlargement. In addition the bed and walls must perform independently. Artificial intelligence design (AID) will introduce a new joint with variable stiffness to transfer the impact loads into the bed (Turk Joint, TJ). According to the exerted load function, stiffness may be varied. In the concrete bed, each part of members will be simulated to determine the divided forces into the steel bars, spiral stirrups and steel pipes by step stiffness method (SSM). Concrete Bed is free from any connection with sheet walls. Tangency joint could be installed to absorb the variable bending moments by double cane action.
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