利用輸出誤差法進行中間層隔震建築物之系統識別

System Identification of Building with Mid.-Floor Seismic Isolation by Using Output-error method

黃承康(Cheng-Kang Huang)

指導教授 ： 田堯彰

國立臺灣大學/工學院/土木工程學研究所/碩士(2010年)

https://doi.org/10.6342/NTU.2010.02473

摘要

摘要

本文旨在建立一個中間層隔震建築的分析模式與其識別流程，期能以一改良式簡化的模型，識別出具物理意義的結構物參數。文中以集中質量的方式，將一個中間層隔震建築物簡化為四自由度的系統；四個自由度分別為上部結構水平單軸方向位移、隔震層上方樓板水平單軸方向位移、下部結構水平單軸方向位移及等值基礎水平單軸方向位移。上部結構以等效線性模態質量法，將多自由度系統轉換為單自由度系統；分析時，假設上部結構及下部結構之力學行為為線性，而隔震層的LRB行為則是非線性，並以Masing準則加以描述，簡化為雙線性模式。隔震層的阻尼參照「臺大土木新館結構計算書」假設為非線性阻尼，其餘自由度為線性阻尼，等值基礎部分則以一組等值的勁度及阻尼模擬中間層建築與土壤互制效應，並假設基礎的力學行為為線性，利用輸出誤差法(Output-error method)在個別自由度處，識別出上部結構、下部結構及等值基礎的線性參數，以及LRB的非線性參數。
在數值範例部份，各自由度的質量、勁度、阻尼參數依據土木新館結構計算書自行估算，利用NEWMARK線性加速度法，以TAP089EW921之地表加速度為輸入，求得各自由度反應，並以此為量測資料，進行識別，以此過程作為驗證識別理論與改良式識別模型。
最後，藉由台灣大學土木工程學系暨研究所新建大樓結構物強震監測系統裝設計畫所取得的歷時資料，作為實例識別之量測值，進行實例分析；同時將整段歷時分段，進行分段性識別，比較整段性與分段性識別的結果。經由識別結果與量測歷時間誤差指標的計算，以驗證識別流程的可靠性。

關鍵字

系統識別 ； 中間層隔震建築 ； 輸出誤差法 ； 土壤結構互制

並列摘要

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.

並列關鍵字

System identification ； mid-story isolation building ； output-error method ； soil-structure interaction

參考文獻

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