System Identification of a Building with Mid-Floor Seismic Isolation Using Bouc-Wen Model

• Main Authors: Bo-Tsang Wu, 吳柏蒼
• Other Authors: 田堯彰
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/07614116902163865629

碩士 === 國立臺灣大學 === 土木工程學研究所 === 99 === This thesis constructs a system identification procedure of building with mid-story isolation , expecting to identify physical parameters of a building with a simplified modal. We used lump mass method, simplifying a building with mid-story isolation 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 degree of freedom to single degree of freedom. Linear mechanical behavior is assumed in superstructure and substructure; nonlinear mechanical behavior is assumed in isolation story, following the Bouc-Wen modal. Besides, in equivalent foundation part, to describe the soil structure interaction system with the Soil Spring Method. Soil and structure is a simplified impedance between the spring and damping, and assume that the reaction is a non-linear response. We used Output-error method to identify superstructure’ s, substructure’s , Bouc-Wen modal in floor above isolation’s and equivalent foundation’s parameters. In numerical example, we considered structural calculation to evaluate four degree of freedoms’ stiffness and damping, and we input TAP089EW921 to state spacement to calculate the response of all degree of freedom. We used the response to identify the parameters. By numerical example, we hope to improve the accurate of the modal and the reasonable of the procedure. Finally, the reliability of present procedure was verified by calculating the error index between the measured data and identified results from new Civil Engineering Building at NTU