Optimal Stiffness Distribution Of Mid-storey Isolated
Buildings Considering Storey Drift And
Floor Acceleration Response
Author(s)
M. Kohiyama & K. Takano
Abstract
This paper formulates a response prediction formula based on complex modal
superposition and frequency response functions of single-degree-of-freedom
systems for both storey drift and floor acceleration of a mid-storey-isolated
building under the assumption of white noise input. This study verifies that the
proposed formula can estimate the seismic response of a building accurately,
even if a system includes the overdamped mode, by comparing the same with the
results of a time-history analysis. To support the structural design of a midstorey-
isolated building, the proposed formula is applied to an optimal design
problem, which considers the objective function of acceleration response in a
superstructure and constraints on storey drifts. A genetic algorithm is employed
to obtain the optimal stiffness distribution and damping coefficient of the
isolation layer. This study confirms that the acceleration response of the optimal
design is successfully reduced, with other responses remaining within acceptable
ranges.
Keywords: mid-storey-isolated buildings, performance-based design, floor
acceleration response, complex complete quadratic combination method, overdamped
vibration.
Keywords
mid-storey-isolated buildings, performance-based design, flooracceleration response, complex complete quadratic combination method, overdampedvibration
Related Book
Other papers in this volume
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