挫屈束制支撐構架設計概要與工程應用

Seismic Design and Applications of Buckling-restrained Braced Frames

吳安傑(An-Chien Wu) ； 林保均(Ming-Chieh Chuang) ； 莊明介(Pao-Chun Lin) ； 蔡克銓(Keh-Chyuan Tsai)

《結構工程》 30卷1期 (2015/03) Pp. 11-33

https://doi.org/10.6849/SE.201503_30(1).0002

摘要

挫屈束制支撐（buckling-restrained brace, BRB）可由習見之營建材料與工藝製造，利用BRB構成的挫屈束制支撐構架（buckling-restrained braced frame, BRBF）能很經濟地提升抗震所需之勁度、強度與韌性。本文說明BRB的構造原理與設計原則，介紹常見的BRB組成與接合類型，闡明核心消能段長度比對BRB等效勁度及核心消能段應變量的影響。除了介紹BRBF系統設計流程外，亦說明設計BRB邊界梁柱構件應特別注意的細節，並提出BRB接合板設計與破壞檢核建議。本文也介紹由國家地震工程研究中心全球首創之雲端設計軟體，利用設計實例示範本軟體在BRB構件及接合的設計功能。最後以國內近年來10件應用BRB之實際工程案為例，介紹國內工程師對BRB所制訂的品質檢核與性能驗證試驗方式，並利用其中10組BRB反覆載重驗證試驗結果說明BRB應具備之受力變形行為與合格標準。

關鍵字

挫屈束制支撐 ； 鋼制震裝置 ； 等效勁度 ； 接合板 ； 梁柱開合效應 ； 耐震設計 ； 容量設計

並列摘要

Buckling-restrained braces (BRBs) can be conveniently fabricated using common construction materials and techniques. Buckling-restrained braced frames (BRBFs) employing BRBs offer desirable seismic resistant lateral strength, stiffness and ductility. This paper introduces the basic concept, key design principles, the various compositions and connection details of BRBs. Effects of the ratio between the BRB yield region length and the brace work point-to-work point length on the BRB axial effective stiffness, the frame yield story drift, and the BRB core strain level are illustrated. This paper discusses the design procedures of the BRBF system, the capacity design principle of the columns and beams adjacent to the BRBs. Recommendations on the design of gussets are also given. The effectiveness of an innovative cloud service, Brace on Demand (BOD), for automated design of BRBs and end connections is demonstrated. Qualifying test results of 10 practical BRBs randomly selected from recent 10 application projects are discussed to demonstrate how Taiwan engineers practice the BRB quality control for building construction projects. Acceptance criteria of the BRB qualifying tests are presented.

並列關鍵字

buckling-restrained brace ； hysteretic damper ； effective stiffness ； gusset connection ； frame action effect ； seismic design ； capacity design