Subassemblage test of buckling-restrained braces with H-shaped steel core

2014 ◽  
Vol 24 (4) ◽  
pp. 243-256 ◽  
Author(s):  
Do-Hyun Kim ◽  
Chang-Hwan Lee ◽  
Young K. Ju ◽  
Sang-Dae Kim
Keyword(s):  
Steel Core ◽  
Buckling Restrained Braces

scholarly journals Modification of Buckling Restrained Braces and Evaluating the Deflection Amplification Factor

2021 ◽  
Vol 9 (VI) ◽  
pp. 4564-4572
Author(s):  
Preena Praveen
Keyword(s):  
Elastic Deformation ◽  
Amplification Factor ◽  
Sudden Change ◽  
Framed Structures ◽  
Steel Core ◽  
Buckling Restrained Braces ◽  
Global Buckling ◽  
Tension And Compression ◽  
Ductile Steel ◽  
Deflection Amplification Factor

Buckling is a main problem in every structure. It is a sudden change in shape or deformation of a structural component under load. Under moderate to severe earthquakes, buckling of compressive braces may cause damage to the joints and connections. So Buckling-Restrained Braces (BRBs) have been widely implemented in framed structures to reduce damage during severe earthquakes. Unlike conventional braces that buckle under compression, the core of BRBs yields both in tension and compression under the restraining effect of the casing. A typical buckling-restrained brace (BRB) is composed of a ductile steel core, which is designed to yield in both tension and compression. To avoid global buckling in compression, the steel core is usually wrapped with a steel casing, which is subsequently filled with mortar or concrete. So in this work the deflection amplification factor of these braces are found out. As DAF predicts the maximum capacity of the structure, so a deep study in this field is necessary. DAF is the ratio of in-elastic deformations to elastic deformation. So after finding the DAF of these BRBs and by knowing the elastic deformation of the structure we can easily find the in-elastic deformation. For this works the analysis are carried out using etabs and abaqus software.

Experimental optimization studies on steel core lengths in buckling restrained braces

2011 ◽  
Vol 67 (8) ◽  
pp. 1244-1253 ◽  
Author(s):  
Masoud Mirtaheri ◽  
Ali Gheidi ◽  
Amir Peyman Zandi ◽  
Pejman Alanjari ◽  
Hamid Rahmani Samani
Keyword(s):  
Experimental Optimization ◽  
Steel Core ◽  
Buckling Restrained Braces

Shaking Table Test of Structure With Reinforced Buckling Restrained Braces

2005 ◽  
Author(s):  
C. S. Tsai ◽  
Wen-Shin Chen ◽  
Kuei-Chi Chen
Keyword(s):  
Shaking Table Test ◽  
Dynamic Testing ◽  
Steel Structure ◽  
Shaking Table ◽  
Test Results ◽  
Buckling Restrained Brace ◽  
Steel Core ◽  
Shaking Table Testing ◽  
Buckling Restrained Braces ◽  
Seismic Loadings

The traditional brace elements will buckle when subjected to severe earthquakes. Many researchers have been trying to overcome this disadvantage of the traditional brace element since 1970’s. Many types of braces have been developed without buckling under large compressive forces called the buckling restrained brace BRB, or unbonded brace. This type brace includes a steel core, a case that encases the steel core and brace projection, and can enhance both the stiffness and hysteretic damping of a structure to resist seismic loadings. Recently, some investigators have carried out the researches focusing on the procedure of designing buckling restrained braces, quasi dynamic testing and the methods of the connection between the buckling restrained brace and main structure. But, these results can not reflect the effects of the structure with buckling restrained braces during earthquakes. Therefore, the shaking table testing should be done to examine the effects of new BRBs on the seismic responses of a structure. In this study, the reinforced buckling restrained braces were installed on a three-story scaled steel structure in Feng Chia University to perform a series of shaking table tests. The test results illustrate that the new unbond braces provide good protection for structures during earthquakes.

Bending Deformation of the Steel Core of Buckling-Restrained Braces

2016 ◽  
Author(s):  
Mitsumasa Midorikawa ◽  
Shunsuke Hishida ◽  
Mamoru Iwata ◽  
Taichiro Okazaki ◽  
Tetsuhiro Asari
Keyword(s):  
Bending Deformation ◽  
Steel Core ◽  
Buckling Restrained Braces

Experimental performance of buckling-restrained braces with steel cores of H-section and half-wavelength evaluation of higher-order local buckling

2016 ◽  
Vol 20 (4) ◽  
pp. 641-657 ◽  
Author(s):  
Wei Li ◽  
Bin Wu ◽  
Yong Ding ◽  
Junxian Zhao
Keyword(s):  
Local Buckling ◽  
Higher Order ◽  
Gradual Change ◽  
Test Results ◽  
The Core ◽  
Buckling Restrained Brace ◽  
Steel Core ◽  
Half Wavelength ◽  
Buckling Restrained Braces ◽  
Theory Of Plates

To prevent lower-order local buckling of H-section steel core, an improved type of buckling-restrained braces named buckling-restrained brace with H-section steel core was proposed by the authors. This article further investigates the effect of configuration details on seismic performance of buckling-restrained braces with H-section steel core and compares two half-wavelength calculation methods for higher-order local buckling of H-section steel core. First, quasi-static cyclic tests are described on two newly designed buckling-restrained braces with H-section steel cores and another buckling-restrained brace with flat steel core. Then, Bleich’s and Lundquist’s methods are reviewed for evaluating half wavelength of higher-order local buckling based on elastoplastic buckling theory of plates and compared with the test results of four buckling-restrained braces with H-section steel core including the two from a previous test. It is found from the test results that due to H-section steel core’s higher self-stability, the compression force fluctuation was not observed on the hysteretic loops of buckling-restrained brace with H-section steel core with even larger clearance but on the buckling-restrained brace with flat core. The buckling-restrained brace with H-section steel core was also advantageous over the buckling-restrained brace with flat core in terms of having lower compression strength adjustment factor β. A stopper in the middle of the core member and the gradual change of cross section of the core plate around the end of stiffeners could help to improve the fatigue performance of buckling-restrained braces. The test results also confirmed that Lundquist’s theory was more reliable for evaluating the half wavelength of higher-order local buckling for H-section steel core.

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