Based on the discretized continuum-type optimality criteria (DCOC), algorithms are developed to find the minimum cost designs of multispan RC T-beams having either a uniform section along each span or a uniform section for all the spans. However, the steel ratio is allowed to vary freely along the length of the beam. The design variables are therefore the depth and the steel ratio. The total cost includes the costs of concrete, reinforcing steel and formwork. The design constraints include limits on the maximum deflection in a given span, and on the bending and shear strength, in addition to upper and lower bounds on design variables. Several numerical examples are solved. Whenever possible, the designs are compared with those obtained by NLP methods in. The optimum designs satisfy the requirements of the CEB/FIB model code or Australian standard AS 3600-1988.

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