挫屈束制支撐局部挫屈與構架耐震效益分析研究

A Study of Local-Buckling BRB and Cost Performance of BRBF

魏志毓(Chih-Yu Wei)

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(2006年)

https://doi.org/10.6342/NTU.2006.01905

摘要

經歷多年的研究與推廣，集眾多優點的挫屈束制支撐（BRB）已逐漸受到重視，但在因應BRB快速成長的同時，仍有研發更經濟、更有利於大量生產，且於地震過後能檢測之BRB構件的需求。本研究發展預鑄式挫屈束制支撐，並以「挫屈束制支撐斷面尺寸規格化」做為目標，提出一簡單的計算公式，使BRB能呈現更經濟與更具空間配置之優勢。構架系統分析與設計部份，由於建築物耐震設計規範要求斜撐構架採較小之基本振動週期，常導致須考慮較同高度的抗彎矩構架更大的設計地震力，斜撐系統是否仍具有良好的經濟效益與耐震性能，實有再探討的必要。
本研究的項目主要包括：(1)研發組合型以及可拆型預鑄式挫屈束制支撐構件並探討其力學行為。(2)藉由BRB局部挫屈試驗，推導BRB所需的混凝土強度需求估算公式，並藉由核心寬厚比 、混凝土厚度 以及混凝土強度 的關係，探討BRB規格化之設計方法。(3)建置BRB構件與接合設計程式，提供工程師方便且迅速之設計工具。(4)提出完整設計案例，比較韌性抗彎矩構架（MRF）、偏心斜撐構架（EBF）與挫屈束制支撐構架（BRBF）的經濟性、可靠性與耐震性能等研究。
試驗顯示新開發的預鑄式挫屈束制支撐具穩定的遲滯反應。所推導之BRB圍束混凝土強度需求估算公式，以核心鋼板材料為 為例， ，混凝土強度需求與其厚度成反比，相較於前人所提出之混凝土強度需求與厚度成正比之理論較適用於工程應用。另所提出之BRB構件與接合設計程式以及支撐規格化參考表，可使應用技術已成熟的BRB，設計時更為簡便。最後利用非線性結構分析程式進行構架系統動態反應歷時模擬，發現斜撐系統能有效控制結構系統受地震時的樓層側位移角，其中以BRBF具有強烈地震下能量集中於斜撐消釋而梁柱構件多保持彈性的優勢，整體用鋼量多寡依序為，MRF、EBF與BRBF。

關鍵字

挫屈束制支撐 ； 預鑄式 ； 局部挫屈 ； 混凝土強度

並列摘要

After many years of study and promotion, the Buckling Restrained Braces (BRB) had been subjected to a value gradually in recent years. In order to produce the products more efficiently and economically in a large quantities and it can be measured after the earthquake. This research use a simple formula based on the goal “standardizing BRB section size’’ developing Precast BRB. In other words, it is going to be more economically and saving spaces. The part of frame system analysis and design, the seismic restraint design code often has lower period of brace frames, it often results in needing higher design load than the same height of Moment Resisting Frame. This research also studied the economic benefits and the performance of seismic of brace frames.
The objectives of this study include: (1) Researching and developing combined and removable type of Precast BRB and probe its mechanics behavior and the characteristic of seismic. (2) Deriving the necessary demand formula for the concrete intensity, using the relation between core proportion of thickness and width ( ) and the thickness ( ) and intensity ( ) of concrete, probe the BRB standardizes method. (3) Constructing the BRB design program, offers more convenient and efficiency design environment to the engineer. (4) Proposing the case study, and comparing the research of the economy, dependability and seismic performance of Moment Resisting Frame (MRF), Eccentrically Braces Frame (EBF), and Buckling Restrained Braces Frame (BRBF).
The results showed that the Precast BRB developed a fully hysteresis and dissipate large amounts of energy. The necessary demand formula for concrete intensity, such as the material of ASTM A572 Grade 50 of core plate, . In engineering application, the concrete intensity is in inverse proportion to thickness is much correct than in direct proportion by predecessor proposing. Moreover, the BRB design program and the standardizing form can make BRB application technology belongs to ripe stage and more convenient design. Finally, using the inelastic structure analysis program PISA3D do the non-linear dynamic time history analysis, resulted the brace frames can effective control the story drift, and the BRB can stably absorb the energy without failing, and the beams and columns have elastic response. Furthermore, the orders from the maximum steel weight to the minimum steel weight are, MRF, EBF, and BRBF.

並列關鍵字

Buckling Restrained Braces ； Precast, Local-Buckling ； Concrete Strength

參考文獻

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