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Elastic-plastic Analysis of Steel Braced Frame

Author: ChenLin
Tutor: XiaoYan
School: Hunan University
Course: Structural Engineering
Keywords: BRB Pushover Nonlinear dynamic time history analysis Performance CO2emission Energy consumption
CLC: TU391
Type: Master's thesis
Year: 2013
Downloads: 73
Quote: 0
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Abstract


Steel braced frame holds both the virtues of steel frame system and bracesystem,such as lightness, high strength and enhanced lateral stiffness. As normalbrace buckling under pressure, the utilization of supporting steel frame is restricted inseismic fortification zone. Buckling restrained brace (BRB) offer lateral restriction tothe steel core to avoid buckling when it is suffered big pressure or pull, and the steelcore always yield. BRB, with enhanced lateral stiffenss and higher earthquake energydissipation capacity, it can be used in seismic mitigation and retrofitting of structure.Nonlinear static analysis for steel frame, normal braced frame and BRB bracedframe were carried out by Sap2000and Perform-3D.Analysis the results of the topdisplacement, maximum layer displacement angle, base shear-drift diagrams. Adoptthe methods recommended by ATC-40to determine the structure response under thedifferent earthquake levels. Nonlinear dynamic time history analysis was then used.The structure is evaluated by the method of Performance Based Seismic Design.Compare the Performance-Based Seismic Design with the current design methodof Strength Based Seismic Design, PBSD method can be more rationality, economyand safety.The CO2emission and energy consumption of steel braced frame system is half ofreinforced concrete structure. Taking into account various factors, such as, materialexpenses, construction cost and so on, steel braced frame structure is economical touse.

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