Earthquake resistant design of concentrically braced steel frames

1991 ◽  
Vol 18 (5) ◽  
pp. 839-850 ◽  
Author(s):  
R. G. Redwood ◽  
V. S. Channagiri
Keyword(s):  
Structural Engineering ◽  
Steel Structures ◽  
Braced Frames ◽  
Concentrically Braced Frames ◽  
Braced Frame ◽  
Earthquake Resistant Design ◽  
Earthquake Resistant ◽  
Concentrically Braced ◽  
Engineering Steel ◽  
The Impact

New provisions of the CSA standard for steel structures (CAN/CSA-S16.1-M89) dealing with detailing of concentrically braced frames for seismic design are described and related to requirements of the National Building Code of Canada. The basis of the new requirements is outlined, and an example eight-storey frame is used to outline a methodology for the design process for a ductile braced frame and to illustrate the impact of the provisions. Key words: design, structural engineering, steel, earthquakes, braced frame, standards.

Seismic response of concentrically braced steel frames

1991 ◽  
Vol 18 (6) ◽  
pp. 1062-1077 ◽  
Author(s):  
Richard G. Redwood ◽  
Feng Lu ◽  
Gilles Bouchard ◽  
Patrick Paultre
Keyword(s):  
Structural Engineering ◽  
Nonlinear Response ◽  
Steel Structures ◽  
Frame Structures ◽  
Braced Frames ◽  
Braced Frame ◽  
Concentrically Braced ◽  
Engineering Steel ◽  
Analysis Design ◽  
Improved Design

Braced frame structures designed according to the 1990 edition of the National Building Code of Canada and the CSA standard for steel structures (CAN/CSA-S16.1-M89) are analyzed under a number of different earthquake motions. The nonlinear response is studied in the light of the design philosophy, and the validity of a number of design assumptions is examined. The study is limited to a group of eight-storey frames, located either in Victoria, British Columbia, or Montreal, Quebec, all with the same bracing configuration. A 20-storey frame in Montreal is also considered. The results suggest a number of areas in which improved design provisions could be made. Key words: analysis, design, structural engineering, steel, earthquakes, braced frames.

Earthquake resistant design of steel moment resisting frames

1990 ◽  
Vol 17 (4) ◽  
pp. 659-667 ◽  
Author(s):  
R. G. Redwood ◽  
L. Lefki ◽  
G. Amar
Keyword(s):  
Structural Engineering ◽  
Steel Structures ◽  
Steel Moment Resisting Frames ◽  
Moment Resisting Frames ◽  
Moment Resisting Frame ◽  
Earthquake Resistant Design ◽  
Earthquake Resistant ◽  
Moment Resisting ◽  
Engineering Steel ◽  
The Impact

New provisions of the CSA Standard for Steel Structures (CAN/CSA-S16.1-M89) dealing with detailing of moment resisting frames for seismic design are described and related to requirements of the National Building Code of Canada. The basis of the new requirements is outlined, and an example eight-storey frame is used to illustrate the impact of the provisions. Key words: design, structural engineering, steel, earthquakes, moment resisting frame, standards.

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.

Seismic design of steel buildings: lessons from the 1995 Hyogo-ken Nanbu earthquake

1996 ◽  
Vol 23 (3) ◽  
pp. 727-756 ◽  
Author(s):  
Robert Tremblay ◽  
Andre Filiatrault ◽  
Michel Bruneau ◽  
Masayoshi Nakashima ◽  
Helmut G. L. Prion ◽  
...  
Keyword(s):  
Seismic Design ◽  
Steel Structures ◽  
Structural Systems ◽  
Braced Frames ◽  
Steel Buildings ◽  
Concentrically Braced Frames ◽  
Framed Structures ◽  
Concentrically Braced ◽  
Moment Resisting ◽  
Column Bases

Past and current seismic design provisions for steel structures in Japan are presented and compared with Canadian requirements. The performance of steel framed structures during the January 17, 1995, Hyogo-ken Nanbu earthquake is described. Numerous failures and examples of inadequate behaviour could be observed in buildings of various ages, sizes, and heights, and braced with different structural systems. In moment resisting frames, the damage included failures of beams, columns, beam-to-column connections, and column bases. Fracture of bracing members or their connections was found in concentrically braced frames. The adequacy of the current Canadian seismic design provisions is examined in view of the observations made. Key words: earthquake, seismic design, steel structures.

scholarly journals The Effect of Local Fuse on Behavior of Concentrically Braced Frame by a Numerical Study

2018 ◽  
Vol 4 (3) ◽  
pp. 655 ◽  
Author(s):  
Ali Kachooee ◽  
Mohammad Ali Kafi ◽  
Mohsen Gerami
Keyword(s):  
Seismic Response ◽  
Numerical Study ◽  
Numerical Models ◽  
Compressive Loading ◽  
Braced Frames ◽  
Concentrically Braced Frames ◽  
Reduced Cross Section ◽  
Braced Frame ◽  
Concentrically Braced Frame ◽  
Concentrically Braced

The concentrically braced frames (CBFs) are one of the most widely used lateral load-resisting systems. Seismic performance of these structures has a weakness that is due to the brace buckling at a lower loading than the ultimate compressive loading capacity. In this paper, attempt is made to enhance the seismic response of CBFs through utilizing a local fuse. For this purpose, first the formulation of fuse area and length are presented. Then based on this formulation, several numerical models have been built and analyzed to examine the effect of implementing this fuse on seismic response of CBFs. From the analyses results, it is found that if the reduced cross-section fuse (RCF) is properly designed and also the end of brace is fixed, the CBFs with equal energy dissipation capacity, that are equipped with this fuse exhibit a better ductility than the customary CBFs.

EXPERIMENTAL STUDY OF INNOVATIVE COMPOSITE BUCKLING-RESTRAINED FUSE FOR CONCENTRICALLY BRACED FRAMES UNDER CYCLIC LOAD

2018 ◽  
Vol 5 (2) ◽  
Author(s):  
Masoud Mohammadi ◽  
Mohammad Ali Kafi ◽  
Ali Kheyroddin ◽  
Hamid Reza Ronagh
Keyword(s):  
Cyclic Load ◽  
Lateral Displacement ◽  
Steel Structures ◽  
High Energy ◽  
Braced Frames ◽  
Concentrically Braced Frames ◽  
Concentrically Braced ◽  
Hysteretic Damper ◽  
High Energy Absorption ◽  
Thin Steel Plate

Concentrically Braced Frames (CBFs) are among the most commonly used lateral resisting systems utilized in the construction of steel structures due to their rigidity, low lateral displacement and ease of implementation. However, the lack of ductility due to the buckling that occurs in the bracing elements before yielding is their main disadvantage. This study presents an innovative Composite Buckling Restrained Fuse (CBRF) to be used as a bracing segment in concentrically braced frames that improves the ductility and eliminates premature buckling. The proposed CBRF with relatively small dimensions is a hysteretic damper consisting of thin steel plate core and extra tensile elements embedded in a composite encasement. Two CBRF samples are designed and tested experimentally. The results indicate that the proposed structural fuse has a ductile behaviour with high energy absorption and sufficient strength along with a reasonably stable hysteretic response under cyclic load.

scholarly journals A Comparative Study on the Behavior of Steel Moment-Resisting Frames with Different Bracing Systems Based on a Response-Based Damage Index

2018 ◽  
Vol 4 (6) ◽  
pp. 1354 ◽  
Author(s):  
Kamran Karsaz ◽  
Seyed Vahid Razavi Tosee
Keyword(s):  
Damage Index ◽  
Steel Structures ◽  
Braced Frames ◽  
Initial Stiffness ◽  
Concentrically Braced Frames ◽  
Braced Frame ◽  
Under Five ◽  
Seismic Rehabilitation ◽  
Moment Resisting Frames ◽  
Moment Resisting

Seismic rehabilitation of existing buildings is one of the most effective ways to reduce damages under destructive earthquakes. The use of bracings is one of techniques for seismic rehabilitation of steel structures. In this study we aimed to investigate the seismic performance of three 5, 10 and 15-storey steel structures with moment-resisting frames designed three dimensionally in ETABS 2015 application based on first edition of Iranian Standard 2800. Their damage under five ground motions was evaluated using response-based damage model proposed by Ghobara et al. (1999). Then, the structures were rehabilitated with different bracing systems (X, eccentric and concentric V and inverted-V) and, again, their damage under five earthquakes were evaluated and compared with those of moment resisting frames. The pushover analysis results indicated that X-braced frame was the least ductile system but had highest initial stiffness and yield stress. In low-rise building, X-braced frames showed better performance among studied bracing systems compared to moment resisting frames, while mid and high-rise buildings with eccentrically braced  frame (EBF) showed the best behavior against earthquakes with the least damage. Moreover, it was found out that EBFs’ performance increases by increasing storey height, but for concentrically braced frames (CBFs) it was decreased. We concluded that the use of response-based damage models can be a suitable procedure for estimating the vulnerability of steel structures rehabilitated with bracing system.

Steel structures damage from the Christchurch earthquake series of 2010 and 2011

2011 ◽  
Vol 44 (4) ◽  
pp. 297-318 ◽  
Author(s):  
Charles Clifton ◽  
Michel Bruneau ◽  
Greg MacRae ◽  
Roberto Leon ◽  
Alistair Fussell
Keyword(s):  
Steel Structures ◽  
Braced Frames ◽  
Concentrically Braced Frames ◽  
Eccentrically Braced Frames ◽  
Satisfactory Performance ◽  
Concentrically Braced ◽  
Earthquake Series ◽  
Moment Resisting ◽  
Industrial Storage ◽  
Storage Racks

This paper presents preliminary field observations on the performance of selected steel structures in Christchurch during the earthquake series of 2010 to 2011. This comprises 6 damaging earthquakes, on 4 September and 26 December 2010, February 22, June 6 and two on June 13, 2011. Most notable of these was the 4 September event, at Ms7.1 and MM7 (MM as observed in the Christchurch CBD) and most intense was the 22 February event at Ms6.3 and MM9-10 within the CBD. Focus is on performance of concentrically braced frames, eccentrically braced frames, moment resisting frames and industrial storage racks. With a few notable exceptions, steel structures performed well during this earthquake series, to the extent that inelastic deformations were less than what would have been expected given the severity of the recorded strong motions. Some hypotheses are formulated to explain this satisfactory performance.

Preliminary report on steel building damage from the Darfield earthquake of September 4, 2010

2010 ◽  
Vol 43 (4) ◽  
pp. 351-359 ◽  
Author(s):  
Michel Bruneau ◽  
Myrto Anagnostopoulou ◽  
Greg MacRae ◽  
Charles Clifton ◽  
Alistair Fussell
Keyword(s):  
Preliminary Report ◽  
Steel Structures ◽  
Building Damage ◽  
Braced Frames ◽  
Concentrically Braced Frames ◽  
Seismic Demands ◽  
Eccentrically Braced Frames ◽  
Concentrically Braced ◽  
Steel Building ◽  
Steel Tanks

This paper presents preliminary findings based on the performance of various steel structures during the Darfield earthquake of September 4, 2010, including concentrically braced frames, eccentrically braced frames, steel tanks, and steel houses. With a few exceptions, steel structures performed well during this earthquake, but much of this is attributed to the fact that seismic demands from the Darfield earthquake were generally lower than considered in their design.

Application of low yield strength steel on controlled plastification ductile concentrically braced frames

2001 ◽  
Vol 28 (5) ◽  
pp. 823-836 ◽  
Author(s):  
Cheng-Cheng Chen ◽  
Shyh-Yeang Chen ◽  
Jiunn-Jye Liaw
Keyword(s):  
Yield Strength ◽  
Steel Structures ◽  
Lateral Force ◽  
Force Distribution ◽  
Test Results ◽  
Braced Frames ◽  
Concentrically Braced Frames ◽  
Concentrically Braced Frame ◽  
Concentrically Braced ◽  
Distribution Requirement

The hysteretic behavior of buckling inhibited braces (BIBs) (or unbonded braces) made of low yield strength steel is investigated experimentally. Test results from four large-scale specimens showed that the BIB is able to prevent early buckling and cracking that occur in conventional braces and develop to the full capacity the strength, ductility, and energy-dissipation capacity of the steel used. In addition, the use of low yield strength steel results in small yield deformation and dramatic strain hardening of the BIB. Earthquake simulation tests of a 0.4-scale three-storey ductile concentrically braced frame (DCBF), which employed low yield strength steel BIBs as concentric braces, were carried out. Test results verified the applicability of the BIB and the high seismic performance of the DCBF. The idea of controlled plastification worked well. In addition, both the 70% lateral-force distribution requirement of the Uniform Building Code and the 30% lateral-force distribution requirement of CAN/CSA-S16.1-94 seem unnecessary for a DCBF system.Key words: concentrically braced frames, earthquake-resistant structures, braces, steel structures.

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