實尺寸三層樓挫屈束制支撐CFT柱構架擬動態試驗行為與分析

Pseudo Dynamic Performance and Analysis of A Full Scale CFT/BRB Composite Frame

蕭博謙(Po-Chien Hsiao)

指導教授 ： 蔡克銓

國立臺灣大學/工學院/土木工程學研究所/碩士(2004年)

https://doi.org/10.6342/NTU.2004.00261

摘要

摘 要
經過近幾年來對於挫屈束制支撐(BRB)之相關研究，可以證實此種消能斜撐確實為一種十分有效的耐震消能元件。因其在受壓時並不會產生挫屈的現象，所以在反覆加載之下可以產生相當飽滿的遲滯迴圈行為，同時消散大量的能量。近幾年來在台灣、日本與美國此種斜撐皆已漸漸被廣泛的使用。
但在過去的相關研究當中，挫屈束制支撐往往是以單軸拉壓的方式進行構件試驗，而在構架試驗方面略顯不足。此外，若要能夠真實反應出斜撐於結構物中不同樓層之行為，採用一樓一跨的試驗模式已不足夠，必須以三層樓之構架來進行試驗才能更確實的呈現出真實結構之行為。
因此，本研究即為一個實尺寸三層樓之挫屈束制支撐構架試驗，希望透過如此的試驗更加了解挫屈束制支撐於結構中之行為。而本研究的主要項目有：1)探討整體構架之行為，將試驗結果與分析軟體所預測之結果以誤差分析的方式作比較，且進一步改善預測分析之模型，以建立更準確之解析模型，可提供未來分析模擬之參考。2)檢討挫屈束制支撐於構架當中是各項行為表現，包括接合板之行為與分析、斜撐消能情形、斜撐累積塑性韌性表現、斜撐端部轉角、不平衡力與斜撐韌性等。3)以構件試驗的方式，研究新式脫層材料與脫層厚度對挫屈束制支撐之行為影響。希望透過本次的試驗與分析結果，提供未來相關研究與相關規範之參考依據。

關鍵字

誤差分析 ； 位移設計法(DSD) ； 鋼管混凝土柱(CFT) ； 挫屈束制支撐(BRB)

並列摘要

In recent years, a lot of researches concerning BRB(Buckling Restrained Braces) confirmed that BRBs are effective components resisting earthquakes. It’s because the BRBs won’t buckle with applied compression axial force, they can develop full hysteresis and dissipate lots of energy. BRBs have been used gradually in recent years including Taiwan, Japan and United States.
In past researches, the experiments of BRBs were always component tests by applying axial tension or compression force. The braced frame tests were insufficient. Furthermore, an one-story one-bay specimen is not enough to react the actual behavior of common structures. An 3-story specimen is needed to exactly present the behavior of real structures.
Therefore, the specimen of this research is a full-scale 3-story 3-bay composite structure, using concrete filled steel tube (CFT) columns in a buckling restrained braced (CFT/BRB) frame. The specimen was tested using pseudo dynamic test procedures and internet testing techniques. There are some topics in the thesis: 1) Finding the global response of the 3-stories frame, and discussing the error between experimental results and analytic responses(Prediction). The error analysis is helpful for modifying the analysis models(Simulation). 2) Discussing several items relating to BRBs behavior, including behavior of gusset, dissipated energy, CPD, end rotation, unbalanced load and ductility of BRBs. 3) By component testing, research a new type of unbonding material and how the thickness of unbonding material affect the behavior of BRBs. Help the discussions above is useful for the relative research in the future.
From experiment, we found the gussets buckle without stiffeners. After adding stiffeners at the edges of gusset, the buckling of gussets never occurred. In the analysis, abbreviating the distance between the end of BRBs and the surface of nearby beam or column is also helpful to avoid the gusset buckling. Besides, BRBs behave well in the frame. They take about 80% of story shear, and dissipate the most of imported earthquake energy. By discussing CPD of braces, it confirm that BRBs can take many large earthquakes without failure. The end rotation of BRBs is existent, and that can be estimate. In the research of the new unbonding material(asphalt), it’s proved that the thickness of unbonding material is the primary factor affecting the difference between tension and compression force. Asphalt can take the place of silicone rubber, it substantially reduce the cost of braced manufacture.

並列關鍵字

Buckling Restrained Braces ； Error Analysis

參考文獻

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3. Cheng,J.J.R., Yam,M.C.H.(1998),”Design and Behavior of Gusset Plate Connections.”JCSR, Vol.46.

12. Tsai, K.C., Weng, Y.T., Lin, S.L. and Goel, S. (2004), “Pseudo-dynamic Test of A Full-scale CFT/BRB Frame: Part 1 - Performance Based Specimen Design”, Proceedings, Paper No. 750, 13th World Conference on Earthquake Engineering, Vancouver, Canada.

2. Chen, C.H., Hsiao, P.C., Lai, J.W., Lin, M.L., Weng, Y.T., and Tsai K.C. (2004). “Pseudo-Dynamic Test of a Full-Scale CFT/BRB Frame: Part 2 - Construction and Testing”, Proceedings, Paper No. 2175, 13th World Conference on Earthquake Engineering, Vancouver, Canada.

4. Cheng,J.J.R., Yam,M.C.H., and Hu,S.Z.(1994),”Elastic Buckling Strength of Gusset Plate Connections.” Journal of Structural Engineering, ASCE, Vol.120, No.2, pp.538~559.