scholarly journals Seismic Response and Design of Steel Multi-Tiered Concentrically Braced Frames of the Conventional Construction Category in Moderate Seismic Regions of Eastern Canada

2021 ◽  
Author(s):  
Eshagh Derakhshan Houreh ◽  
Ali Imanpour
Keyword(s):  
Seismic Response ◽  
Seismic Design ◽  
Design Method ◽  
Braced Frames ◽  
Concentrically Braced Frames ◽  
Eastern Canada ◽  
Concentrically Braced ◽  
Seismic Regions ◽  
Moderate Seismic Regions ◽  
Seismic Design Method

This paper examines the seismic behaviour of steel Multi-Tiered Concentrically Braced Frames (MT-CBFs) of the Conventional Construction category (Type CC) in moderate seismic regions of eastern Canada and proposes a new seismic design method for such structures. A total of 32 prototype MT-CBFs part of a single-storey building are selected and designed in accordance with the 2019 Canadian steel design standard (CSA S16-19) provisions for Type CC structures, excluding the design requirements prescribed for frames taller than 15m, namely the amplification of seismic forces varying by the frame height and the amplification of the column factored seismic force. Nonlinear response history analyses are then performed to examine their seismic response. The results confirmed that tiers experience limited lateral deformation, intermediate horizontal struts are required between tiers, and columns are subjected to combined axial force and bi-axial bending, which in some cases led to column buckling. The results are used to propose a new seismic design method in the framework of CSA S16.

A Simplified Seismic Design Method for Limited-Ductility Steel Multi-Tiered Concentrically Braced Frames in Moderate Seismic Regions

2021 ◽  
Author(s):  
Eshagh Derakhshan Houreh ◽  
Ali Imanpour
Keyword(s):  
Design Method ◽  
Design Procedure ◽  
Efficient Design ◽  
Braced Frames ◽  
Concentrically Braced Frames ◽  
Seismic Behaviour ◽  
Analysis And Design ◽  
Concentrically Braced ◽  
Seismic Regions ◽  
Moderate Seismic Regions

Steel Multi-Tiered Concentrically Braced Frames (MT-CBFs) represent a bracing configuration where two or more concentric bracing panels are stacked between the ground and roof levels in tall single-storey buildings. A large proportion of MT-CBFs in Canada are located in low-to-moderate seismic regions (Seismic Category 0 – 3) where Limited Ductility CBFs are often preferred in design. Nevertheless, brace tensile yielding may not occur in all tiers of such frames. Additionally, the analysis and design procedure adopted by the 2019 Canadian steel design standard (CSA S16-19) can become tedious in tall frames with multiple panels. In this paper, the seismic behaviour of Limited Ductility MT-CBFs in moderate seismic regions of Canada is examined to propose a simplified design method. A set of 16 prototype MT-CBFs is designed in accordance with CSA S16-19, excluding the design requirements prescribed for MT-CBF columns. Nonlinear dynamic analyses are then performed to examine their seismic response. Finally, an efficient design method is proposed in the framework of CSA S16-19.

Three-segment steel brace for seismic design of concentrically braced frames

2017 ◽  
Vol 137 ◽  
pp. 211-227 ◽  
Author(s):  
Onur Seker ◽  
Bulent Akbas ◽  
Pinar Toru Seker ◽  
Mahmoud Faytarouni ◽  
Jay Shen ◽  
...  
Keyword(s):  
Seismic Design ◽  
Braced Frames ◽  
Concentrically Braced Frames ◽  
Concentrically Braced

Code provisions for seismic design for concentrically braced steel frames

1992 ◽  
Vol 19 (6) ◽  
pp. 1025-1031 ◽  
Author(s):  
R. G. Redwood ◽  
A. K. Jain
Keyword(s):  
Seismic Design ◽  
Structural Engineering ◽  
Steel Frames ◽  
Braced Frames ◽  
Concentrically Braced Frames ◽  
Braced Frame ◽  
Concentrically Braced ◽  
Interstorey Drift ◽  
Available Information ◽  
Steel Braced Frame

Extensive research into the inelastic seismic response of concentrically braced frames and their components has been carried out in the last two decades. This knowledge has now been incorporated into seismic design practice in several countries, notably the U.S.A., Canada, and New Zealand. In this paper, design specifications from these three countries, which derive largely from the same body of research, are compared. The basic design philosophy for concentrically braced steel frames, loading, and member detailing are examined. It is concluded that, in general, the Canadian specifications are in conformity with the available information and have many similar features to codes of the other countries. Significant differences exist in the classification of braced frames, between interstorey drift requirements, in the treatment of dual structural systems, and to a lesser extent in member detailing requirements. Some features of Canadian codes meriting review are identified. Key words: structural engineering, earthquakes, standards, steel, braced frame, ductility, concentric bracing, dual system.

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