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.

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.

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 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.

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.

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.

scholarly journals ANALISA PERBANDINGAN STRUKTUR BAJA 3 LANTAI MENGGUNAKAN SYSTEM CBF DAN EBF DENGAN METODE PUSH OVER ANALYSIS

2020 ◽  
Vol 12 (2) ◽  
pp. 75-81
Author(s):  
Sumaidi Sumaidi ◽  
Wahyu Kartini ◽  
Anna Rumintang
Keyword(s):  
Braced Frames ◽  
Concentrically Braced Frames ◽  
Eccentrically Braced Frames ◽  
Drift Ratio ◽  
Concentrically Braced

Indonesia merupakan termasuk negara yang berada di ring of fire dan di beberapa batas lempeng tektonik, sehingga tingkat risiko terjadinya gempa bumi sangatlah tinggi.Analisa struktur yang digunakan yaitu perbandingan sistem concentrically braced frames (CBF) dan eccentrically braced frames (EBF) berdasarkan pada peraturan struktur tahan gempa. Hasil analisis menunjukkan Daktilitas struktur dengan sistem CBF lebih kecil daripada sistem EBF. Struktur dengan sistem CBF lebih kaku dan kokoh dibandingkan dengan sistem EBF. Daktilitas yang bagus adalah yang bernilai lebih dari 1, sehingga struktur tidak mudah runtuh. Pada kondisi linier, sistem CBF memiliki perilaku atau kinerja yang lebih baik ditunjukkan dengan penggunaan material, displacement maksimum dan drift ratio yang lebih kecil. Pada kondisi nonlinier, sistem ini (EBF)  memiliki perilaku maupun kinerja yang lebih baik terbukti dengan penyerapan energi dan daktilitas yang lebih baik.

scholarly journals Performance of steel structures during the 1994 Northridge earthquake

1995 ◽  
Vol 22 (2) ◽  
pp. 338-360 ◽  
Author(s):  
Robert Tremblay ◽  
André Filiatrault ◽  
Peter Timler ◽  
Michel Bruneau
Keyword(s):  
Current Knowledge ◽  
Steel Frames ◽  
Steel Structures ◽  
Northridge Earthquake ◽  
Braced Frames ◽  
Concentrically Braced Frames ◽  
Load Paths ◽  
Concentrically Braced ◽  
Moment Resisting ◽  
Observed Damage

The performance of concentrically braced steel frames and moment resisting steel frames during the January 17, 1994, Northridge, California, earthquake is examined. Most of the observations made during the reconnaissance visits confirmed the current knowledge on the inelastic response of these structural systems. This permits the anticipation of proper seismic behavior for buildings designed according to the seismic provisions that have been recently introduced in the Canadian building code and standard for steel structures. In some cases, however, the observed damage raised concerns that should be addressed in future investigations or next editions of these codes. Preventing potentially hazardous nonstructural damage, avoiding premature nonductile failures anywhere along the lateral load paths, limiting structural and nonstructural damage due to brace buckling, and accounting for the vertical ground motion are among those issues. Key words: earthquake, seismic, steel, concentrically braced frames, moment resisting frames, weld.

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