A Study of Local-Buckling BRB and Cost Performance of BRBF
Date Issued
2006
Date
2006
Author(s)
Wei, Chih-Yu
DOI
zh-TW
Abstract
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.
Subjects
挫屈束制支撐
預鑄式
局部挫屈
混凝土強度
Buckling Restrained Braces
Precast, Local-Buckling
Concrete Strength
Type
thesis
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