System Identification of Building with Mid.-Floor Seismic Isolation by Using Output-error method
Date Issued
2010
Date
2010
Author(s)
Huang, Cheng-Kang
Abstract
Abstract
The objective of the research is to establish a system identification procedure of mid-story isolation building to identify the meaningful parameters of building with simplified building model. The research simplifies the mid-story isolation building as four degree of freedom system by using lump mass method. The four degree of freedom systems are superstructure, floor above isolation system, substructure and equivalent foundation, respectively. By using effective modal mass and effective modal height method, the multiple degrees of freedom system for superstructure are divided into single degree of freedom system. Assuming the mechanical behaviors of superstructure and substructure are linear, and the behavior of isolation story is non-linear; further, the behavior of isolation story is simplified from non-linear to bilinear behavior by using massing criteria. The damping of isolation story is assumed as non-linear damping in the research, the other freedoms are linear damping. As for the equivalent foundation, a set of equivalent damping and spring is adopted to simulate the soil-structure interaction of the mid-story isolation building, and the mechanic behavior of foundation is assumed as linear; finally, the Output-error method is applied to each degree of freedom to identify the linear parameter of superstructure, substructure and equivalent foundation, and the non-linear parameter of LRB.
In numerical examples section, according to the 「Structural computation statement in the New Research Building of Civil Engineering department of Nation Taiwan University」, mass, stiffness, damping parameter of each degree of freedom can be estimated voluntarily. Following the research regards the ground acceleration of TAP089EW921 earthquake as input data, and then the Newmark’s linear acceleration method is used to obtain the behavior of each degree of freedom. Subsequently, regarding the behavior of each degree of freedom as measurement data, the identification procedure is executed to verify the suitability of identification theory and modified identification model.
The data gathered by Strong Motion Instrumentation Program in the New Research Building of Civil Engineering department of Nation Taiwan University is adopted as measurement data to implement practical analysis, both the single and multi-section identification are accomplished and discussed in the research. Finally, the reliability of the identification procedure is verified by calculating the error indicators between the result of identification procedure and measurement data.
Subjects
System identification
mid-story isolation building
output-error method
soil-structure interaction
Type
thesis
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