1 Abstract In the last decades there is an increasing interest and investigation in the area of control applied to civil engineering structures. It’s been shown that it is possible to improve structural performance by providing control devices that use sensors information to modify the dynamic properties. An integrated cable-stayed bridge and control strategy system is designed in view of improving safety against dynamic loading, in particular pedestrian vibration. The design problem concerns the optimization with goals of minimum cost, stresses, accelerations and displacements. It is cast as a multi-objective optimization and a Pareto solution is sought. An entropy-based technique is used to find the minimax solution by minimizing a convex scalar function. Keywords: cable stayed, structural control, multi-objective optimization, integrated design. 1 Introduction Traditionally, structures and their control devices are designed separately. An integrated optimum design is proposed here for a cable stayed pedestrian bridge. Tzan and Pantelides [1] presented a methodology to optimally design an active frame subject to seismic excitation, the objective being minimize the structural volume with constraints of story drift and stresses. Khot [2] proposed an approach to optimally design integrated space systems using multi-objective optimization with goals of minimum volume, control force and time to suppress oscillations. In 2008 Cimellaro et al. [3] illustrated a two-stage optimization procedure for designing active steel frames. In 2009 Cimellaro et al. [4] extended their work to account for inelastic structures. Steel footbridges are usually very flexible structures this, added to their low inherent damping, amplifies their response under dynamic loading. SETRA [5] published a Paper 167 Optimum Design of Active and Passive Cable Stayed Footbridges F.L.S. Ferreira 1 and L.M.C. Simoes 2 1 Department of Civil Engineering University of Oporto, Portugal 2 Department of Civil Engineering University of Coimbra, Portugal ©Civil-Comp Press, 2010 Proceedings of the Tenth International Conference on Computational Structures Technology, B.H.V. Topping, J.M. Adam, F.J. Pallarés, R. Bru and M.L. Romero, (Editors), Civil-Comp Press, Stirlingshire, Scotland