Behavior of Reinforced Concrete Frames Retrofitted by Different Configurations of Concentric Steel Braces

Beiraghi, Hamid; Kheyroddi, A.; Nafechi, Z. Falaki

doi:10.1007/s40996-021-00799-1

Cited by 6 publications

(3 citation statements)

References 9 publications

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“…And after applying steel bracing, it shows a significant decrease of drift in all stories, with a reduction by 51.92% for inverted V brace and 42.92% for V brace. This is in accordance with a study conducted in India where after additional mega X bracing there was a significant drift decrease with a reduction reaching 55.23% in y direction [29]. From table 11 explains the effectivity various bracing which the effectiveness of the Inverted V brace is more than the V brace.…”

Section: B Story Drift Resultssupporting

confidence: 88%

The Performance Assessment of the Structural Bracing Model for Multi-Story Building

Anastasia,

Saputro,

Goro

et al. 2024

Int. J. Adv. Sci. Eng. Inf. Technol.

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Earthquakes are a severe issue for construction. The building collapsed due to the earthquake because it could not bear the earthquake load. Even more so, it was constructed using outdated and different building regulations that do not comply with modern building codes that account for seismic loads. As a result, disaster mitigation methods, such as retrofitting, must be implemented. Retrofitting procedures are commonly used in many developed countries. The bracing system is a typical retrofitting method used on building structures. In this study, a retrofitting program was carried out on The State Finance Building II Semarang, which was built in the 1980s, one of the old buildings in Semarang City, using a reinforced portal structure. This study's bracing system is a Concentrically Brace Frame (CBF) with Inverted V Brace and V Brace variations. The structural analysis software ETABS V.18.2.0 analyzes the building's structure. The structural review includes story drift, the P-Delta effect, and horizontal torsion irregularities. According to the results, steel bracing can minimize the period and displacement associated with story drift, making the structure more stable, with a maximum displacement reduction of 59.66% for inverted V-type steel bracing. Aside from that, steel bracing also can minimize the occurrence of torsion in the building. As a result, steel braces can be used to strengthen the structure.

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Section: B Story Drift Resultssupporting

confidence: 88%

The Performance Assessment of the Structural Bracing Model for Multi-Story Building

Anastasia,

Saputro,

Goro

et al. 2024

Int. J. Adv. Sci. Eng. Inf. Technol.

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“…Steel-Braced Reinforced Concrete (RC) Frames, which are utilized to enhance rigidity and stability against lateral forces, exemplify the complexity of modern structural systems that are not adequately captured by existing empirical models. The interactions within concentric and eccentric bracing systems are poorly represented in current building codes, leading to potential misestimations with serious implications for seismic safety and serviceability (Beiraghi et al, 2022;Cao et al, 2019;Godínez-Domínguez et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Deep symbolic regression for numerical formulation of fundamental period in concentrically steel-braced RC frames

Rahman,

Sultana,

Ahmed

et al. 2024

Asian J Civ Eng

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This research explores the use of Deep Symbolic Regression (DSR) to develop a sophisticated predictive model for the fundamental period of vibration in concentrically steel-braced reinforced concrete (RC) frames. Traditional empirical models often overlook complex interactions within structural dynamics during seismic events, a gap this study addresses by deriving tailored equations for various bracing configurations such as Cross bracing, Diagonal bracing, and Chevron bracing. The model development incorporates an iterative refinement process utilizing DSR techniques to enhance accuracy and applicability in predicting seismic responses. Further refinement and optimization are achieved using the L-BFGS-B algorithm, ensuring robustness and adherence to safety standards. Validation against actual structural data reveals that our proposed equations achieve high predictive accuracy, with R-squared values up to 0.8247 and RMSE values as low as 0.2119, consistently presenting lower error metrics across various configurations compared to those found in established seismic design standards, such as ASCE, Eurocode, and Japan's Building Standards. Comparative analyses and Bland-Altman plots confirm that the models not only match but often surpass the accuracy of traditional formulas, validating their potential as reliable tools in structural engineering for earthquake resilience planning. The findings demonstrate DSR's potential to revolutionize traditional practices in formulating empirical equations, offering a scientifically rigorous, data-driven methodology for more accurately predicting the dynamic responses of structures under seismic loads.

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“…Rahimi and Maheri (2020) examined the performance of strengthening an existing concrete frames using X steel braces, it was found that retrofitting with the addition of X steel bracing to an RC frame enhanced the global and local seismic behavior through nonlinear time history analyses. Beiraghi et al (2022) studied the responses of a 2-story frame retrofitted with different types of bracing configurations including Ʌ, V, one-story X, two-story X and combined between Ʌ and V, braces. The results show that the frame performed better in terms of stiffness and strength when the two-story X configuration was used than the other types.…”

mentioning

confidence: 99%

Seismic performance assessment of deficient RC structures retrofitted with different steel bracing systems

Bouderradji,

Dimia,

Gherabli

et al. 2023

J. Eng. Exact Sci.

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This paper discusses the use of concentric steel bracing systems as a global technique for retrofitting RC structures. A case study building with a five-story RC structure was retrofitted and tested using different types of bracing systems with different arrangements namely diagonal, X, and a combination between diagonal and X steel braces with tow arrangements. The main objective of the current study is to find out the most effective bracing system to upgrading the seismic behavior of deficient RC structures. The nonlinear static pushover and dynamic time-history analyses were carried out. The first method was applied by pushing the models until they arriving at a predefined target roof displacement. In the second method, a set of three natural earthquakes was employed to perform a dynamic time history analysis. The results indicate that the combined system of the diagonal and X braces using the second arrangement has the highest base shear and reaches the target roof displacement under pushover analysis. On the other hand, when using the response history analysis, it is the best system to reduce roof displacement compared to other techniques. However, steel braces cannot reduce the acceleration of the structure. The proposed combined system with the second arrangement is an effective retrofitting technique that has a much better seismic behavior and improves the ability to withstand even larger earthquake forces compared to other techniques.

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Behavior of Reinforced Concrete Frames Retrofitted by Different Configurations of Concentric Steel Braces

Cited by 6 publications

References 9 publications

The Performance Assessment of the Structural Bracing Model for Multi-Story Building

The Performance Assessment of the Structural Bracing Model for Multi-Story Building

Deep symbolic regression for numerical formulation of fundamental period in concentrically steel-braced RC frames

Seismic performance assessment of deficient RC structures retrofitted with different steel bracing systems

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