Design method and behavior factor for steel frames with buckling restrained braces

2012 ◽  
Vol 42 (8) ◽  
pp. 1243-1263 ◽  
Author(s):  
Melina Bosco ◽  
Edoardo M. Marino
Keyword(s):  
Design Method ◽  
Steel Frames ◽  
Behavior Factor ◽  
Buckling Restrained Braces ◽  
And Behavior

scholarly journals Geometric Parameters and Behavior Factor of Knee-Braced Steel Frames Using Nonlinear Static Pushover (NSP) Analyses

2016 ◽  
Vol 10 (11) ◽  
pp. 110
Author(s):  
Majid Anoushehei ◽  
Farhad Daneshjoo
Keyword(s):  
Steel Frames ◽  
Resistance Coefficient ◽  
Reduction Factor ◽  
Geometric Parameters ◽  
Braced Frame ◽  
Behavior Factor ◽  
Seismic Force ◽  
Force Reduction Factor ◽  
Nonlinear Static ◽  
And Behavior

During the recent years, the new knee-braced frame (KBF) system has been interested to achieve a proper seismic behavior. Briefly introducing KBF, the present study evaluates the geometric parameters and behavior factor of multi-story knee-braced steel frames. The studied models include three-, five- and eight-story steel CBFs, EBFs and KBFs. Using linear static analyses, the present study evaluates lateral stiffness of knee-braced frames and plots their co-stiffness curves. Using co-stiffness curves, then, the best range is determined for geometric parameters of KBFs to achieve the proper stiffness. In addition, ductility-related seismic force reduction factor (Rμ), incremental resistance coefficient (RS), and behavior factor (R) are calculated for the frames using incremental nonlinear static analyses, and compared with the corresponding concentric and eccentric frames.

A unified earthquake-resistant design method for steel frames using arma models

1991 ◽  
Vol 20 (5) ◽  
pp. 483-501 ◽  
Author(s):  
Izuru Takewaki ◽  
Joel P. Conte ◽  
Stephen A. Mahin ◽  
Karl S. Pister
Keyword(s):  
Design Method ◽  
Steel Frames ◽  
Arma Models ◽  
Earthquake Resistant Design ◽  
Earthquake Resistant

scholarly journals Seismic design and analysis of reinforced concrete buckling-restrained braced frame buildings with multi-performance criteria

2019 ◽  
Vol 15 (10) ◽  
pp. 155014771988135
Author(s):  
Yanchao Yue ◽  
Tangbing Chen ◽  
Yongtao Bai ◽  
Xiaoming Lu ◽  
Yan Wang ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Seismic Design ◽  
Design Method ◽  
Performance Criteria ◽  
Main Beam ◽  
Frame Structures ◽  
Concrete Frame ◽  
Buckling Restrained Brace ◽  
Buckling Restrained Braces ◽  
Line Design

Buckling-restrained braces play a critical role as the first-defendant line in dissipating seismic energy and are often used in concrete frame structures to ensure that the main beam–column members are “undamaged” or significantly elastic during medium earthquakes. The design of the reinforced concrete frame structures with buckling-restrained brace is generally based on the assumption of shear deformation of the structure. The conventional seismic design considers the “second-defendant line design” based on the geometric relationship between the axial deformation and strength of buckling-restrained braces and stratified deformation. This article proposes iterative optimization of the buckling-restrained brace design method and layout scheme based on the nonlinear structural response of the calibrated numerical model, and then approximates the nonlinear structure scheme using a linear method. Time history analyses are performed to prove that the linear design method is highly conservative for estimating seismic intensity, and the proposed design method provides more efficient damage distributions in frame components. The results of the nonlinear performance evaluation and energy analysis indicate that the method proposed in this article can meet the performance design requirements achieving multi-performance criteria.

Displacement-Based Seismic Design of Steel Frames Strengthened by Buckling-Restrained Braces

2012 ◽  
Vol 217-219 ◽  
pp. 1114-1118 ◽  
Author(s):  
Marco Valente
Keyword(s):  
Steel Frames ◽  
Design Procedure ◽  
Steel Frame ◽  
Seismic Retrofitting ◽  
Target Displacement ◽  
Earthquake Excitation ◽  
Capacity Spectrum ◽  
Buckling Restrained Braces ◽  
Displacement Based ◽  
Nonlinear Dynamic Analyses

This study presents a displacement-based design procedure for seismic retrofitting of steel frames using buckling-restrained braces (BRB) to meet a given target displacement in the framework of the capacity spectrum method. The seismic performance of a six-storey steel frame equipped with BRB is investigated. Different storey-wise BRB distribution methods are proposed and the influence on the results of the design procedure is analyzed. Nonlinear dynamic analyses demonstrate the efficacy of the design procedure showing the improvements achieved by the retrofitting intervention using BRB. The maximum top displacement registered for the retrofitted frame under earthquake excitation coincides with the target displacement obtained in accordance with the design procedure. The introduction of buckling-restrained braces enhances the earthquake resistance of the steel frame, providing significant energy dissipation and the stiffness needed to satisfy structural drift limits.

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