Modular tied eccentrically braced frames for improved seismic response of tall buildings

2019 ◽  
Vol 155 ◽  
pp. 370-384 ◽  
Author(s):  
L. Chen ◽  
R. Tremblay ◽  
L. Tirca
Keyword(s):  
Seismic Response ◽  
Tall Buildings ◽  
Braced Frames ◽  
Eccentrically Braced Frames

Seismic Response of Eccentrically Braced Frames

1980 ◽  
Vol 106 (4) ◽  
pp. 843-860
Author(s):  
Ashok K. Jain ◽  
Subhash C. Goel
Keyword(s):  
Seismic Response ◽  
Braced Frames ◽  
Eccentrically Braced Frames

scholarly journals Validation of a Design Procedure for Failure Mode Control of EB-Frames: Push-Over and IDA Analyses

2013 ◽  
Vol 7 (1) ◽  
pp. 193-207 ◽  
Author(s):  
Luigi Mastrandrea ◽  
Elide Nastri ◽  
Vincenzo Piluso
Keyword(s):  
Seismic Response ◽  
Failure Mode ◽  
Design Procedure ◽  
High Energy ◽  
Collapse Mechanism ◽  
Braced Frames ◽  
Link Length ◽  
Eccentrically Braced Frames ◽  
Ductility Demand ◽  
Global Type

The paper is devoted to the investigation of the seismic response of eccentrically braced frames characterised by links having different length. In addition, the analysed structures have been designed according to a methodology, already proposed by the authors, aiming to guarantee a collapse mechanism of global type. Therefore, the results of the nonlinear analyses herein presented provide the validation of the proposed design procedure, by testifying that all the designed structures exhibit a global failure mode where all the links are yielded while all the columns remain in elastic range with the exception of the base section of first storey columns, leading to high energy dissipation capacity and global ductility. Furthermore, two different distributions of the link lengths are examined. The first one is characterised by short links with uniform lengths along the height of the structure. The second one is characterised by the use of link elements having different length at the different storeys which are selected to assure the same value of the non-dimensional link length. The seismic response of EB-Frames with such distributions of the link length is investigated by means of both push-over analyses and dynamic non-linear analyses. The comparison of the performances is mainly carried out in terms of plastic hinges distribution, local ductility demand and frame lateral stiffness.

Design and seismic behaviour of taller eccentrically braced frames

2010 ◽  
Vol 37 (2) ◽  
pp. 195-208 ◽  
Author(s):  
Sanda Koboevic ◽  
Simona Olivia David
Keyword(s):  
Seismic Response ◽  
Seismic Performance ◽  
Control Design ◽  
Design Criteria ◽  
Braced Frames ◽  
Local Response ◽  
Shear Forces ◽  
Seismic Behaviour ◽  
Eccentrically Braced Frames ◽  
Global And Local

This paper describes a study of the seismic behaviour of taller eccentrically braced frames (EBFs). Chevron-type EBFs with shear-critical links are designed for 14-, 20-, and 25-storey buildings in Montreal and Vancouver. For each location the importance of different design criteria is discussed and an appropriate design sequence is proposed. It was found that ductility requirements did not control design. For Vancouver, buildings member selection was mostly influenced by the inelastic inter-storey drift requirements whereas for Montreal ensuring the global frame stability was critical. The seismic response of these frames to the sets of earthquake records calibrated to match design spectra is described. The seismic performance for Vancouver frames was found to be adequate, except that in the upper storeys the inelastic link deformations and shear forces exceeded values anticipated in design. For the Montreal structures, all global and local response indicators remained well below the design limits.

Evaluation of Seismic Response Factors for Eccentrically Braced Frames Using FEMA P695 Methodology

2016 ◽  
Vol 32 (1) ◽  
pp. 303-321 ◽  
Author(s):  
Ahmet Kuşyılmaz ◽  
Cem Topkaya
Keyword(s):  
Seismic Response ◽  
Amplification Factor ◽  
Numerical Study ◽  
Braced Frames ◽  
Response Factors ◽  
Eccentrically Braced Frames ◽  
Collapse Probability ◽  
Collapse Models ◽  
Deflection Amplification Factor

This paper reports details of a numerical study undertaken to evaluate seismic response factors for steel eccentrically braced frames (EBFs) using the FEMA P695 methodology. Six archetypes were designed by making use of the current U.S. specifications, and their behavior was assessed by making use of nonsimulated collapse models. Results indicate that the current values of response factors result in designs with higher collapse probabilities than expected. Two modifications were developed to bring the collapse probability of these archetypes to acceptable levels. The first modification is on the deflection amplification factor while the second one is on the response modification coefficient. Six archetypes were redesigned using the proposed modifications and reevaluated using the FEMA P695 methodology. The results indicate that the proposed modifications are adequate to satisfy the target collapse probability. Maximum and cumulative link rotation angles were observed to be less than the predefined limits.

scholarly journals Seismic rocking effects on a mine tower under induced and natural earthquakes

2021 ◽  
Vol 21 (2) ◽  
Author(s):  
Piotr Adam Bońkowski ◽  
Juliusz Kuś ◽  
Zbigniew Zembaty
Keyword(s):  
Seismic Response ◽  
Ground Motion ◽  
Ground Surface ◽  
Tall Buildings ◽  
Earthquake Ground Motion ◽  
Seismic Action ◽  
Seismic Effects ◽  
Copper Ore ◽  
Rotational Components ◽  
Natural Earthquakes

AbstractRecent research in engineering seismology demonstrated that in addition to three translational seismic excitations along x, y and z axes, one should also consider rotational components about these axes when calculating design seismic loads for structures. The objective of this paper is to present the results of a seismic response numerical analysis of a mine tower (also called in the literature a headframe or a pit frame). These structures are used in deep mining on the ground surface to hoist output (e.g. copper ore or coal). The mine towers belong to the tall, slender structures, for which rocking excitations may be important. In the numerical example, a typical steel headframe 64 m high is analysed under two records of simultaneous rocking and horizontal seismic action of an induced mine shock and a natural earthquake. As a result, a complicated interaction of rocking seismic effects with horizontal excitations is observed. The contribution of the rocking component may sometimes reduce the overall seismic response, but in most cases, it substantially increases the seismic response of the analysed headframe. It is concluded that in the analysed case of the 64 m mining tower, the seismic response, including the rocking ground motion effects, may increase up to 31% (for natural earthquake ground motion) or even up to 135% (for mining-induced, rockburst seismic effects). This means that not only in the case of the design of very tall buildings or industrial chimneys but also for specific yet very common structures like mine towers, including the rotational seismic effects may play an important role.

Sign in / Sign up

Export Citation Format

Share Document