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Analysis on Structure System of Bucking-restrained Braced Steel Frame

Author: HeZhongCai
Tutor: WangZhan
School: South China University of Technology
Course: Structural Engineering
Keywords: BRBs Buckling Stiffness of braces triple-steel tube BRBs
CLC: TU391
Type: Master's thesis
Year: 2011
Downloads: 192
Quote: 1
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Abstract


As China is a quake-prone country, the structure ant seismic design has been very important. Because the frame-supported structure can resist earthquake effectively, this kind of structure type has become more widely used. However, buckling would usually happen when general brace is pressed under seismic action. People found that lots of steel frame with general brace bore more serious damage because the brace generated buckling during the 1994 Northridge Earthquake and the 1995 Kobe Earthquake. In order to improve the anti-seismic performance of brace, researchers from Japan invent a new type of brace- Buckling-Restrained Braces (BRBs)Through setting up appropriate restraints for the general braces, BRBS could restrain its buckling under compression rather than its axial deformation that the full cross-section of BRBs would yield and the buckling would not happen on braces. By reasonable design, the BRBs could not only supply lateral stiffness for the structure but also reduce even avoid the damage of building by means of its hysteretic dissipated energy when the BRBs yield before the structure.Firstly, the invention and development about BRBs are introduced in this paper. Stability theory about this kind of brace is explained as well. Then, finite element modeling to a special kind of BRBs-triple-steel tube BRBs is carried out and this paper proposes some recommendation for the design of this kind brace.Then, experiments of two steel frames with BRBs are designed. The effect of BRBs on steel frame is investigated by analyzing the result of experiment. The stiffness of BRBs has obvious effect on stress of steel frame. Besides, the horizontal stiffness that BRBs supplies for steel frame need reduce some degree.Finally, the effects of BRBs with different stiffness on structure is simulated by general finite element analysis software ANSYS and that confirm the conclusion of experiments. Effects of BRBs with different stiffness on structure and the discount of horizontal stiffness that BRBs supplies for steel frame are system analyzed with this software. Besides, the influence of different arrangement of BRBs on energy dissipation of structural system is analyzed. This paper supplies some advisements for the design of structural system with BRBs in the end.

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CLC: > Industrial Technology > Building Science > Building structure > Metal structures > Steel
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