Design of optimal feedback for structural control This book addresses problems in optimal structural control. It provides solutions and techniques for optimal control design problems related to passive and semi active controlled structures. Optimal control theory is used in order to solve these problems in a rigorous manner. Modern theoretical notions such as dissipativity and passivity of dynamic systems are discussed in the context of the addressed problems. Novel solutions for optimal passive and semi active control design problems are derived and verified by rigorous theoretical derivations and numerical simulations of typical civil structures which are subjected to different types of dynamic excitations