Toggle buckling-restrained brace systems and a corresponding design method for the seismic retrofit of bridge bents

2020 ◽  
Vol 221 ◽  
pp. 110996
Author(s):  
Yan Shi ◽  
Zhengwu Zhong ◽  
Hongguo Qin ◽  
Jianping Han ◽  
Zhiguo Sun
Keyword(s):  
Design Method ◽  
Seismic Retrofit ◽  
Buckling Restrained Brace ◽  
Bridge Bents

Innovative Use of Profiled Steel Plates for Seismic Structural Performance

2005 ◽  
Vol 8 (3) ◽  
pp. 247-257 ◽  
Author(s):  
Y. Fukumoto ◽  
T. Takaku ◽  
T. Aoki ◽  
K. A. S. Susantha
Keyword(s):  
Numerical Analysis ◽  
Seismic Performance ◽  
Structural Design ◽  
Design Method ◽  
Steel Plates ◽  
Structural Performance ◽  
Cyclic Testing ◽  
Beam Columns ◽  
Bridge Bents ◽  
Hot Rolled

This paper presents the innovative use of hot-rolled thickness-tapered mill products, longitudinally profiled (LP) plates, for the seismic performance of bridge bents of single and portal framed piers. The study involves the inelastic cyclic testing and numerical analysis of tested beam-columns and portal frames in order to evaluate the effects of tapering ratios of LP plates, penetration of yielding, and number of locally buckled panels on their structural ductility. A structural design method is proposed for the portal frames having LP panels under cyclic loadings.

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.

Seismic Retrofit of Spatial Structures Using Buckling Restrained Brace

2018 ◽  
Vol 18 (4) ◽  
pp. 105-111
Author(s):  
Hee-Suk Moon ◽  
◽  
Gee-Chul Kim ◽  
Joo-Won Kang ◽  
Joon-Ho Lee
Keyword(s):  
Seismic Retrofit ◽  
Spatial Structures ◽  
Buckling Restrained Brace

scholarly journals SEISMIC RETROFIT OF EXISTING TELE COMMUNICATION TOWER USING BUCKLING RESTRAINED BRACE(Structures)

2005 ◽  
Vol 11 (22) ◽  
pp. 179-184 ◽  
Author(s):  
Yasuo OOKOUCHI ◽  
Toru TAKEUCHI ◽  
Shiro KATO ◽  
Kazuaki SUZUKI
Keyword(s):  
Seismic Retrofit ◽  
Buckling Restrained Brace

scholarly journals Seismic Retrofit of an Existing Reinforced Concrete Building with Buckling-restrained Braces

2021 ◽  
Vol 15 (1) ◽  
pp. 203-225
Author(s):  
Massimiliano Ferraioli ◽  
Angelo Lavino ◽  
Carmine Molitierno ◽  
Gennaro Di Lauro
Keyword(s):  
Reinforced Concrete ◽  
Uniform Distribution ◽  
Design Method ◽  
Time History ◽  
Seismic Retrofit ◽  
Time History Analysis ◽  
Performance Criteria ◽  
Ductility Demand ◽  
History Analysis ◽  
Buckling Restrained Braces

Background: The seismic retrofitting of frame structures using hysteretic dampers is a very effective strategy to mitigate earthquake-induced risks. However, its application in current practice is rather limited since simple and efficient design methods are still lacking, and the more accurate time-history analysis is time-consuming and computationally demanding. Aims: This paper develops and applies a seismic retrofit design method to a complex real case study: An eight-story reinforced concrete residential building equipped with buckling-restrained braces. Methods: The design method permits the peak seismic response to be predicted, as well as the dampers to be added in the structure to obtain a uniform distribution of the ductility demand. For that purpose, a pushover analysis with the first mode load pattern is carried out. The corresponding story pushover curves are first idealized using a degrading trilinear model and then used to define the SDOF (Single Degree-of-Freedom) system equivalent to the RC frame. The SDOF system, equivalent to the damped braces, is designed to meet performance criteria based on a target drift angle. An optimal damper distribution rule is used to distribute the damped braces along the elevation to maximize the use of all dampers and obtain a uniform distribution of the ductility demand. Results: The effectiveness of the seismic retrofit is finally demonstrated by non-linear time-history analysis using a set of earthquake ground motions with various hazard levels. Conclusion: The results proved the design procedure is feasible and effective since it achieves the performance objectives of damage control in structural members and uniform ductility demand in dampers.

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