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This paper describes the Benchmark Problem for controlled cable-stayed bridges. The benchmark in
question is the first to be related directly to bridges. It follows on from past experience and
experimentation, devoted to buildings, developed at an international level. These past experiences focused
upon buildings subjected to wind and earthquake excitation. In this paper seismic excitation is explored in
relation to bridges.
Three different schemes of active control are compared with each other. Their performance is also
compared with the two most widely used passive control systems which summarize present energy