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Abstract

In order to design an infrastructure of an elevated bridge, first a target ductility factor .mu.d and target natural period T.sub.d for the infrastructure are set in connection with an assumed earthquake motion. Subsequently, a yield seismic coefficient for the target ductility factor .mu..sub.d and target natural period T.sub.d is obtained from a yield seismic coefficient spectrum for the assumed earthquake motion as a design seismic coefficient K.sub.h. On the other hand, a target yield rigidity K.sub.d corresponding to the target natural period T.sub.d is obtained. Subsequently, the design seismic coefficient K.sub.h is used to obtain a design horizontal load bearing capacity H.sub.d and a displacement corresponding to the design horizontal load bearing capacity H.sub.d is obtained as a design yield displacement .delta..sub.d from the target yield rigidity K.sub.d. Subsequently, the design horizontal load bearing capacity H.sub.d is distributed into a horizontal force H.sub.f to be borne by the RC rigid frame and a horizontal force H.sub.b to be borne by the damper-brace. Next, member sections of the RC rigid frame and the damper-brace are set so that the RC rigid frame and the damper-brace resist the horizontal forces H.sub.f, H.sub.b with ultimate load bearing capacities and displacements corresponding to the horizontal forces H.sub.f, H.sub.b equal the product of the design yield displacement .delta..sub.d and target ductility factor .mu..sub.d, that is, .delta..sub.d.mu..sub.d.

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