Seismic performance of buckling-restrained braced frames with varying beam-column connections

Ghowsi, Ahmad Fayeq; Sahoo, Dipti Ranjan

doi:10.1007/s13296-013-4003-0

Cited by 33 publications

(4 citation statements)

References 5 publications

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“…They also mentioned that the reason for using masonry walls is to reduce drift in frames equipped with buckling restrained braces. Fayeq et al [17] investigated the seismic performance of frames with buckling restrained braces with changes in beam-to-column connections. Kiggins et al [18] examined residual drift in frames with buckling restrained braces as a dual system.…”

Section: Figure 1 Ideal Stress-strain Behavior Of Superelastic Shapementioning

confidence: 99%

Analyzing the Explosive Behavior of a Buckling Restrained Brace Frame Made of Shape Memory Alloy by Using Finite Element Method

2023

International Journal of Science and Engineering Applications

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In this study, we investigate the behavior of a buckling restrained brace frame made of a shape memory alloy when subjected to explosive loads. To accomplish this, we initially loaded a conventional braced frame with a span of 6 meters and a height of 3 meters with explosive forces. The simulation and validation processes will be conducted using the ABAQUS software. After validating the results, we examine eight additional models using ABAQUS software. These models are divided into four groups. In each group, the first sample is constructed from plain steel alloy, while the second sample is made from a shape memory alloy with identical specifications to the first sample. In the first group, the explosive load is set at 10 kilograms, in the second group, it is 30 kilograms, in the third group, it is 50 kilograms, and in the final group, the mass of the explosive material is 100 kilograms. The analysis results reveal that as the amount of explosive material increases, displacement and stress in the samples rise. The displacement increases significantly in the last set of samples (with 100 kilograms of explosive material). By incorporating shape memory alloy into the samples, especially with lower quantities of explosive material, it is possible to partially restore the structure to its initial state, thereby reducing the severity of damage inflicted upon it. Even with higher amounts of explosive material, a substantial level of restoration can be achieved, further minimizing structural damage.

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Section: Figure 1 Ideal Stress-strain Behavior Of Superelastic Shapementioning

confidence: 99%

Analyzing the Explosive Behavior of a Buckling Restrained Brace Frame Made of Shape Memory Alloy by Using Finite Element Method

2023

International Journal of Science and Engineering Applications

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“…The performance of the structure is conventionally evaluated based on Engineering Demand Parameters (EDPs) 28 and the comparison between their demand values and acceptance criteria (also referred to as capacity limits). Most research studies focusing on fragility assessment (e.g., 6, 7, 9, 29) consider global EDPs, as they allow estimating structural and non‐structural damage states with relatively low computational efforts. Among others, the inter‐storey drift ratio (IDR) is a widely adopted global EDP, as it is used as a proxy to synthetically describe the local damage in the structure.…”

Section: Introductionmentioning

confidence: 99%

Influence of the design objectives on the seismic performance of steel moment resisting frames retrofitted with buckling restrained braces

Gutiérrez‐Urzúa

Freddi

2022

Earthq Engng Struct Dyn

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Buckling restrained braces (BRBs) represent an effective strategy for the seismic retrofit of existing steel moment resisting frames (MRFs), as they contribute to increasing the strength and ductility capacity of the structure. However, current design strategies do not provide recommendations on how the performance increase is achieved. Prioritising either the increase of strength or ductility capacity has an impact on the damage evolution and affects the overall performance of the structure. A low increase of strength typically requires larger exploitation of the ductility capacity (i.e., damage) of the existing structure, while a high increase of strength produces a significant increase of stiffness, which is often accompanied by an increase of the seismic demands that may limit the effectiveness of the retrofitting solution. The present study assesses the impact of these decisions on the overall performance of steel MRFs retrofitted with BRBs. For this purpose, two MRFs with several BRB retrofitting configurations are used as case study structures. Finite Element Models are built in OpenSees and assessed through Incremental Dynamic Analyses to account for the record‐to‐record variability. Fragility relationships are derived based on local Engineering Demand Parameters (EDPs) to describe structural and non‐structural damage, as well as path‐dependent damage indicators (i.e., residual drifts and cumulative ductility in BRBs). A comparison of the overall performance of the structures is carried out in terms of risk estimates for a high seismicity location.

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“…Ariyaratana and Fahnestock [15] noted that the reserve strength provided by the moment-resisting connections within a BRBF and/or an SMRF, in parallel with the BRBF used to create a dual system configuration, played a critical role in the residual displacement response and soft-story mechanism of BRBFs. Similarly, Ghowsi and Sahoo [16] investigated the effect of beam-column connections on the overall seismic response of a medium-rise BRBF. Sahoo and Chao [17] proposed a stiffness-based design for BRBFs to control the residual interstory drifts by increasing the elastic story stiffness using column sections with a higher moment of inertia, which is essentially a dual system.…”

Section: Introductionmentioning

confidence: 99%

Damage Concentration Effect of Multistory Buckling‐Restrained Braced Frames

Wang

Feng

et al. 2019

Advances in Civil Engineering

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Due to the low postyield stiffness of buckling-restrained braces (BRBs), multistory buckling-restrained braced frames (BRBFs) subjected to earthquakes are prone to lateral deformations and damage concentrations at certain stories, which is deemed a damage concentration effect (DCE). A series of nonlinear pushover analyses and response history analyses are conducted to investigate the key factors affecting the DCE of BRBFs. Two comparisons of the DCE are performed for different types of structures and different beam-to-column connections in the main frame (MF). These comparisons show that BRBFs equipped with BRBs as the main earthquake resistance system have a more serious DCE than the traditional moment-resisting frame or conventional braced frame and that the MF stiffness significantly affects the structural residual displacement and DCE. Then, parametric analyses are performed to investigate the influence of two stiffness distribution parameters (in the horizontal and vertical directions) on the DCE of a 6-story BRBF dual system designed according to the Chinese seismic code. The results show that increasing the MF stiffness and avoiding abrupt changes in the BRB stiffness between stories can effectively mitigate the DCE of BRBFs. Finally, the correlations between various damage performance indices are analyzed. A low statistical correlation between the peak and residual drift responses can be observed in BRBFs. Therefore, it is recommended that the DCE be considered in BRBF design.

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Seismic performance of buckling-restrained braced frames with varying beam-column connections

Cited by 33 publications

References 5 publications

Analyzing the Explosive Behavior of a Buckling Restrained Brace Frame Made of Shape Memory Alloy by Using Finite Element Method

Analyzing the Explosive Behavior of a Buckling Restrained Brace Frame Made of Shape Memory Alloy by Using Finite Element Method

Influence of the design objectives on the seismic performance of steel moment resisting frames retrofitted with buckling restrained braces

Damage Concentration Effect of Multistory Buckling‐Restrained Braced Frames

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