Abstract :
In this work an algorithm is developed for the optimal design of simply supported prestressed concrete girders subjected to the stress and deflection constraints of the ACI code specifications. The objective is to minimize the total cost of the symmetrical I-section girder, considering cost of concrete, prestressing and mild steel. The design variables considered are, width and thickness of flange, width and depth of web, tendon layout, and area of prestressing and mild steel. Explicit constraints on the design variables are developed on the basis of geometric requirements, practical conditions for construction, and code restrictions. The technique for optimization used is modified Box Complex method; applied for the first time to prestressed concrete girders and has proven as an efficient tool for finding the optimal design of simply supported prestressed concrete girders.
Keyword :
Optimization; Box Complex Method; Prestressed concrete girders; Minimum cost; ACI-Code.