<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>Tall buildings have unique seismic challenges, particularly the P-delta effect. This can cause an increase in loads on certain parts of the structure, leading to potential instability or collapse. The solution is to use buckling restrained bracing (BRB) systems, which improve the lateral strength of the structure and control the P-delta effect. The present study aimed to determine the effectiveness of various brace configurations in reducing the seismic response of a 50-story reinforced concrete structure, with a focus on P-delta effects. To achieve this, linear dynamic analysis (response spectrum analysis) was conducted using E-TAB software. The selection of bracing configuration, however, depends upon the seismic zone. For this reason, five distinct configurations (X-pattern, inverted V, forward inclined, zig-zag, and bare frame) are considered for the analysis of buildings in different seismic zones. A building model was employed to study the behaviour of a structure with and without BRB to compare the parameters of storey drift, story displacement, diaphragm drift, story shear, story stiffness, and story acceleration using E-TAB software. Results showed that both Type-4 and Type-2 braces perform similarly in several aspects in seismic zones III and V. However, Type-2 braces perform slightly better in terms of storey stiffness-Y, with a lower difference of 39-40 % compared to Type-4 braces with a difference of 49 %.</p>
</abstract>

Tall buildings have unique seismic challenges, particularly the P-delta effect. This can cause an increase in loads on certain parts of the structure, leading to potential instability or collapse. The solution is to use buckling restrained bracing (BRB) systems, which improve the lateral strength of the structure and control the P-delta effect. The present study aimed to determine the effectiveness of various brace configurations in reducing the seismic response of a 50-story reinforced concrete structure, with a focus on P-delta effects. To achieve this, linear dynamic analysis (response spectrum analysis) was conducted using E-TAB software. The selection of bracing configuration, however, depends upon the seismic zone. For this reason, five distinct configurations (X-pattern, inverted V, forward inclined, zig-zag, and bare frame) are considered for the analysis of buildings in different seismic zones. A building model was employed to study the behaviour of a structure with and without BRB to compare the parameters of storey drift, story displacement, diaphragm drift, story shear, story stiffness, and story acceleration using E-TAB software. Results showed that both Type-4 and Type-2 braces perform similarly in several aspects in seismic zones III and V. However, Type-2 braces perform slightly better in terms of storey stiffness-Y, with a lower difference of 39-40 % compared to Type-4 braces with a difference of 49 %.

Analytical Study of Buckling Restrained Braced Frames in Different Seismic Zone Using ETABS

Civil and Environmental Engineering

This work is licensed under the Creative Commons Attribution 4.0 International License.

Tall buildings have unique seismic challenges, particularly the P-delta effect. This can cause an increase in loads on certain parts of the structure, leading...

Analytical Study of Buckling Restrained Braced Frames in Different Seismic Zone Using ETABS

Published Online: May 12, 2023

Page range: 426 - 443

DOI: https://doi.org/10.2478/cee-2023-0038

Keywords
BRBs, Buckling restrained brace, Seismic zone, P-delta, Linear dynamic

© 2023 Aparna Shiny Gottem et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Analytical Study of Buckling Restrained Braced Frames in Different Seismic Zone Using ETABS

Published Online: May 12, 2023

Page range: 426 - 443

DOI: https://doi.org/10.2478/cee-2023-0038

KeywordsBRBs, Buckling restrained brace, Seismic zone, P-delta, Linear dynamic

© 2023 Aparna Shiny Gottem et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Keywords
BRBs, Buckling restrained brace, Seismic zone, P-delta, Linear dynamic