Making use of brace overstrength to improve the seismic response of multistorey split-X concentrically braced steel frames

2006 ◽  
Vol 33 (8) ◽  
pp. 1005-1021 ◽  
Author(s):  
Martin Lacerte ◽  
Robert Tremblay
Keyword(s):  
Seismic Response ◽  
Dynamic Instability ◽  
Design Method ◽  
Steel Frames ◽  
Design Guidelines ◽  
Quebec City ◽  
Axial Loads ◽  
Buckling Instability ◽  
Inelastic Demand ◽  
Concentrically Braced

This paper presents a study on the inelastic seismic response of multistorey split-X concentrically braced steel frames. Structures with different plan areas and heights are examined for Victoria, British Columbia, and Québec City, Quebec. Structures designed according to current code provisions are found to develop a concentration of inelastic demand over their height, which can lead to dynamic instability. This behaviour was more pronounced for the taller and larger structures located in western Canada. A design method is proposed to mitigate the concentration of inelastic deformations by a proper selection of the bracing members. P–Δ effects also need to be included in the design. Guidelines are also proposed for the accumulation of brace-induced axial loads for column design. Structures up to 12 storeys designed according to the proposed method are found to exhibit a stable inelastic response and storey drifts within acceptable limits.Key words: bracing member, braced steel frame, buckling, instability, seismic, storey drift.

Seismic response of concentrically braced dual steel frames

1993 ◽  
Vol 20 (4) ◽  
pp. 672-687 ◽  
Author(s):  
A. K. Jain ◽  
R. G. Redwood ◽  
Feng Lu
Keyword(s):  
Seismic Response ◽  
Steel Frames ◽  
Dual System ◽  
Seismic Load ◽  
Braced Frame ◽  
Moment Resisting Frame ◽  
Inelastic Analysis ◽  
Concentrically Braced ◽  
Moment Resisting ◽  
The Impact

Concentrically braced steel frames are one of the most commonly used structural systems because of their structural efficiency, simplicity to analyze and design, and ease of construction and repair. Canadian design codes provide specifications for their design under seismic loading based on the large amount of knowledge related to their seismic response accumulated over the past two decades. This paper examines the impact of a dual system with a moment resisting frame acting in parallel with the concentrically braced frame. Four different frames were designed in accordance with the National Building Code of Canada and CSA-S16.1-M89, and their inelastic responses are studied under the action of both monotonically increasing load and seismic load. The relative strengths and stiffnesses of the frames comprising the dual systems were varied. The ductility demands on members, and overall building deflections and storey drifts, were examined under the action of ten earthquake records. It is concluded that improved performance such as reduced ductility demand and improved uniformity of the distribution of yield throughout the structure can be achieved. However, the stiffness and strength in the moment resisting frame necessary to provide marked improvement must be a significant proportion of those of the braced frame. Key words: structural engineering, earthquakes, inelastic analysis, concentric bracing, dual system, steel, buckling.

Assessment of the Seismic Response of Concentrically-Braced Steel Frames

2015 ◽  
pp. 327-344 ◽  
Author(s):  
Brian M. Broderick ◽  
Jamie Goggins ◽  
Darko Beg ◽  
Ahmet Y. Elghazouli ◽  
Philippe Mongabure ◽  
...  
Keyword(s):  
Seismic Response ◽  
Steel Frames ◽  
Concentrically Braced
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