System Identification of Buildings with Mid-Story Isolation Considering Soil-Structure Interaction
Date Issued
2009
Date
2009
Author(s)
Chen, Chung-Li
Abstract
This thesis constructs a system identification procedure of buildings with mid-story isolation, expecting to identify physical parameters of a building with a simplified model. We used lump mass method, considering only single axial horizontal degree of freedom. With these assumptions, we can simplify a building with mid-story isolation include basement structure into a four degree of freedom system. These degrees of freedom are superstructure, floor above isolation system, substructure and equivalent foundation. For the superstructure, concepts of effective modal mass and effective modal height are adopted to simplify multiple degrees of freedom to single degree of freedom. Linear mechanical behavior is assumed in superstructure and substructure; nonlinear mechanical behavior is assumed in isolation story, meanwhile simplified into bilinear behavior with Masing criteria. Besides, a set of equivalent damping and spring, assumed to have linear mechanical behavior, was adopted to simulate soil-structure interaction, estimating proper equivalent foundation parameters with empirical equations. Output-error method was applied to identify linear and bilinear parameters of all degrees of freedom. Different from previous researches which demands to fix a certain parameter in order to obtain the other, this thesis obtains both parameters at the same time. The advantages of this procedure are: improvement of the identity value accuracy; and decreasing of manual control errors. Finally, the reliability of the present procedure was verified by calculating the error index between the results from the present procedure and ETABS’s dynamic analysis of the new Civil Engineering Building at NTU.
Subjects
system identification
buildings of mid-story isolation
output-error method
soil-structure interaction
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-98-R96521225-1.pdf
Size
23.32 KB
Format
Adobe PDF
Checksum
(MD5):9dac84be4ff763743905a93d2d89ccca