せん断型地盤で支持されたせん断棒型構造物の指定地震時変形に対する剛性設計

概要

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A new seismic stiffness design method is developed for a shear-beam super structure supported by a shear-beam ground. Mean peak shear deformation of the combined shear beam subjected to a set of spectrum-compatible ground motions defined at the bedrock is evaluated by the modal combination rule due to Yang et al. A hybrid inverse eigenmode problem is formulated for the corresponding undamped model and a closed-form solution to the problem is derived. It is shown that this hybrid inverse formulation plays a central role in developing a stiffness design method of the super beam structure. Fundamental characteristics of this stiffness design and the effect of ground stiffness on the design of super beam structures are disclosed. Several design examples are presented to demonstrate the usefulness of this design method and time-history response analysis is performed to demonstrate the accuracy of this method.
1995-04-30