Preliminary Design of Low-Rise Buildings Stiffened with Buckling-Restrained Braces by a Displacement-Based Approach

2009 ◽  
Vol 25 (1) ◽  
pp. 185-211 ◽  
Author(s):  
Amador Teran-Gilmore ◽  
Neftali Virto-Cambray
Keyword(s):  
Mexico City ◽  
Seismic Design ◽  
Mechanical Characteristics ◽  
Ground Motions ◽  
Flexural Behavior ◽  
Preliminary Design ◽  
Lake Zone ◽  
Buckling Restrained Braces ◽  
Displacement Based ◽  
Story Building

A displacement-based methodology for the preliminary design of a system of buckling-restrained braces is introduced. The methodology applies to the case of low-rise buildings, whose dynamic response is not significantly influenced by global flexural behavior or higher modes. The methodology is applied to the preliminary design of a five-story building located in the Lake Zone of Mexico City. From the evaluation of the global mechanical characteristics of the building and of its seismic performance when subjected to ground motions generated in that zone, it is concluded that the proposed methodology yields an adequate level of seismic design.

Displacement-Based Preliminary Design of Tall Buildings Stiffened with a System of Buckling-Restrained Braces

2011 ◽  
Vol 27 (1) ◽  
pp. 153-182 ◽  
Author(s):  
Amador Teran-Gilmore ◽  
Guillermo Coeto
Keyword(s):  
Dynamic Response ◽  
Mexico City ◽  
Seismic Performance ◽  
Mechanical Characteristics ◽  
Tall Buildings ◽  
Preliminary Design ◽  
Lake Zone ◽  
Buckling Restrained Braces ◽  
Displacement Based ◽  
Story Building

A displacement-based methodology for the preliminary design of a system of buckling-restrained braces is introduced. The methodology applies to the case of tall buildings, whose dynamic response is significantly influenced by global flexural drift mode and higher modes. The methodology is applied to the preliminary design of a 24-story building located in the Lake Zone of Mexico City. From the evaluation of the global mechanical characteristics of the building and of its seismic performance, it is concluded that the proposed methodology yields tall buildings that adequately satisfy predefined deterministic performance levels.

A Displacement-Focused Seismic Design of Mixed Building Systems

2002 ◽  
Vol 18 (4) ◽  
pp. 689-718 ◽  
Author(s):  
Tom Paulay
Keyword(s):  
Reinforced Concrete ◽  
Seismic Design ◽  
Preliminary Design ◽  
Design Strategies ◽  
Displacement Ductility ◽  
Building Systems ◽  
Concrete Building ◽  
Displacement Based ◽  
Mixed Systems ◽  
Prediction Of Displacements

A postulated prediction of displacements in ductile reinforced concrete building systems is based on a redefinition of basic structural properties. Contrary to the ability of traditional techniques, the proposed approach permits displacement limits, relevant to ductile mixed systems, i.e., those with markedly differing components, to be established before details, such as strengths, are addressed. This should lead to significant benefits at the stage of preliminary design. Acceptable displacement limits, associated with currently introduced direct displacement-based seismic design strategies, can be readily and simply established. Similarly, limits of displacement ductility demands on components and the system, associated with current force-based approaches, can be estimated already as part of the preliminary design.

Seismic response of long-period sites: lessons from the September 19, 1985, Mexican earthquake

1988 ◽  
Vol 25 (1) ◽  
pp. 128-137 ◽  
Author(s):  
W. D. Liam Finn ◽  
Andrew M. Nichols
Keyword(s):  
Shear Modulus ◽  
Mexico City ◽  
Seismic Design ◽  
Site Response ◽  
Ground Motions ◽  
Critical Role ◽  
Delta Area ◽  
Design Spectra ◽  
Acceleration Data

The implications for seismic design in Canada, of the acceleration data recorded at a number of sites in Mexico City during the September 19, 1985, earthquake, were investigated. The conditions for amplification of low-level incoming ground motions at deep sites were identified, in particular, the critical role of variation in shear modulus with shear strain. The current procedure for determining site-specific ground motions was evaluated and major sources of uncertainty in the results were identified. Criteria for selecting representative input motions for site response studies are recommended based on results of analyses of Mexico City sites. A comparative study of sites in the Fraser Delta area of British Columbia showed that offshore subduction earthquakes should be considered when developing design spectra for deep sites in the delta. Key words: earthquakes, seismic design, ground motions, shear modulus, design spectra.

scholarly journals Damping Reduction Factors for Crustal, Inslab, and Interface Earthquakes Characterizing Seismic Hazard in Southwestern British Columbia, Canada

2016 ◽  
Vol 32 (1) ◽  
pp. 45-74 ◽  
Author(s):  
Poulad Daneshvar ◽  
Najib Bouaanani ◽  
Katsuichiro Goda ◽  
Gail M. Atkinson
Keyword(s):  
British Columbia ◽  
Seismic Hazard ◽  
Seismic Design ◽  
Ground Motions ◽  
Seismic Protection ◽  
Frequency Content ◽  
Displacement Spectra ◽  
Protection Systems ◽  
Displacement Based ◽  
Reduction Factors

High-damping displacement spectra and corresponding damping reduction factors ( η) are important ingredients in seismic design and analysis of structures equipped with seismic protection systems, as well as in displacement-based design methodologies. In this study, we investigated η factors for three types of earthquake characterizing seismic hazard in southwestern British Columbia, Canada: shallow crustal, deep inslab, and interface subduction. We used a large and comprehensive database including records from recent relevant earthquakes, such as the 2011 Tohoku event. Our key observations were as follows: (1) there is negligible dependence of η on soil class; (2) there is significant dependence of η on the frequency content and duration of ground motions that characterize the different record types, and (3) η is dependent on period, particularly for inslab events. Period-dependent equations were proposed to predict η for damping ratios between 5% and 30% corresponding to the three event types.

Direct Displacement Based Seismic Design of High Rise Structures with Strengthened Stories (II) - Application

2011 ◽  
Vol 250-253 ◽  
pp. 2186-2195
Author(s):  
Ke Jia Yang ◽  
Lin Zhu Sun ◽  
Lian Meng Chen
Keyword(s):  
Seismic Design ◽  
Mechanical Characteristics ◽  
Design Method ◽  
Design Procedure ◽  
High Rise ◽  
New Ideas ◽  
Earthquake Action ◽  
Displacement Based ◽  
Seismic Design Method ◽  
Displacement Based Seismic Design

Based on mechanical characteristics of high rise structures with strengthened stories, the author performed direct displacement based seismic design on a high rise structure with 2 strengthened stories according to the direct displacement based seismic design principle. The performance levels are set to be “serviceability” under medium earthquake and “life safety” under major earthquake, respectively. The design procedures are with the following features: (1) Definition and selection of “key” stories are based on mechanical characteristics of high rise structures with strengthened stories; (2) Determination of mode number and calculation of horizontal earthquake action verified the availability of the design procedure; (3) some new ideas are proposed to improve the earthquake action calculation and structural performance control. The design procedure verified the effectiveness, feasibility and availability of the proposed direct displacement based seismic design method.

fib Bulletin 25. Displacement-based seismic design of reinforced concrete buildings

2003 ◽  
Author(s):  
G. Michele Calvi ◽  
Daniel P. Abrams ◽  
Hugo Bachmann ◽  
Shaoliang Bai ◽  
Patricio Bonelli ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Seismic Design ◽  
Reinforced Concrete Buildings ◽  
Concrete Buildings ◽  
Displacement Based ◽  
Displacement Based Seismic Design

Evaluation of floor acceleration demands from the 2017 Mexico City code seismic provisions using a continuous elastic model and records of instrumented buildings

2020 ◽  
Vol 36 (2_suppl) ◽  
pp. 213-237
Author(s):  
Miguel A Jaimes ◽  
Adrián D García-Soto
Keyword(s):  
Mexico City ◽  
Seismic Design ◽  
Soft Soil ◽  
Response Spectra ◽  
Elastic Model ◽  
Ground Acceleration ◽  
Nonstructural Components ◽  
Floor Response Spectra ◽  
Instrumented Buildings ◽  
Floor Acceleration

This study presents an evaluation of floor acceleration demands for the design of rigid and flexible acceleration-sensitive nonstructural components in buildings, calculated using the most recent Mexico City seismic design provisions, released in 2017. This evaluation includes two approaches: (1) a simplified continuous elastic model and (2) using recordings from 10 instrumented buildings located in Mexico City. The study found that peak floor elastic acceleration demands imposed on rigid nonstructural components into buildings situated in Mexico City might reach values of 4.8 and 6.4 times the peak ground acceleration at rock and soft sites, respectively. The peak elastic acceleration demands imposed on flexible nonstructural components in all floors, estimated using floor response spectra, might be four times larger than the maximum acceleration of the floor at the point of support of the component for buildings located in rock and soft soil. Comparison of results from the two approaches with the current seismic design provisions revealed that the peak acceleration demands and floor response spectra computed with the current 2017 Mexico City seismic design provisions are, in general, adequate.

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