下部剛性指定せん断型構造物モデルの混合型逆定式化による地震時応答制約剛性設計

概要

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A new seismic stiffness design method is developed for an elastically supported composite shear building model. A hybrid inverse eigenmode problem is formulated first for the corresponding undamped model. All the floor masses of the model and the stiffnesses of the support spring and the lower stories are prescribed. Then the stiffnesses of the upper stories are found for a specified lowest eigenvalue and a specified set of lowest-mode interstory-drift components in the upper stories. Sufficient conditions are introduced and proved for a specified eigenvalue and a specified set of interstory-drift components in the upper stories to provide positive stiffnesses of the upper stories and to be those in the lowest eigenvibration. A problem of eigenvalue analysis and its inverse problem are combined in this hybrid inverse eigenmode formulation. lt is finally shown that this formulation is quite useful in developing a seismic stiffness design method for elastically supported composite shear building models.
1994-01-30