A performance-based design method for high-rise buildings using reduction and inverse expansion of frame models

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The purpose of this research is to develop a rational and practical computer aided structural design system, which is intended to maximize the efficiency of structural engineers, for high-rise buildings (including those with passive dampers). The main results of our research include:(1) We have proposed an optimum design method for a 3D building frame having lubber isolators and viscous dampers at a mid story. The basic idea behind the proposed optimum design method is to expand a shear frame model to a full frame model composed of beam elements. This is an inverse approach to the reduction of the full frame model to the share frame model, which is often used in ordinary structural design.(2) We have extended the optimum design method developed last year for building structures based on "the calculation of response and limit strength," which was introduced in the Japanese building code-revised in 2000, by taking into account the effect of response amplification in the ground surface.(3) A new stiffness design method has been developed for shear buildings subject to a design earthquake with non-monotonic displacement spectrum. The objective function that is a combination of the fundamental natural period which represents 'cost' and the level of the maximum displacements which represents 'performance' is introduced into the design method to find a set of story stiffness under response constraints. We have further extended this method so that it can deal with multiple design earthquakes.