Seismic Collapse Risk Assessment and FRP Retrofitting of RC Coupled C-Shaped Core Walls Using the FEMA P695 Methodology

Arabzadeh, Hamid; Galal, Khaled

doi:10.1061/(asce)st.1943-541x.0001820

Cited by 23 publications

(12 citation statements)

References 27 publications

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“…According to the results, R3-SSW achieved a remarkable 39% reduction in RIDR for the 15-story wall, compared to a 22% reduction in the 20-story wall. This disparity can be attributed to the greater efficiency of EB-FRP in enhancing stiffness in shorter walls, a trend that previous studies have corroborated [3,54].…”

Section: Residual Displacement Of Walls 621 Walls In Vancouvermentioning

confidence: 84%

“…Firstly, it arises from the confinement effect and flexural strengthening, which effectively enhances the post-yield stiffness in these structural elements. Secondly, adopting strengthening schemes reduces the structural vibration period, collectively leading to an amplified shear demand on the walls [3,11,47,55]. In Eastern Canada, the 20-story wall, denoted as R1-SSW, R2-SSW, and R3-SSW, experienced increases in base shear demand by 7%, 10%, and 14%, respectively.…”

Section: Shear Force Demandmentioning

confidence: 99%

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The Use of Externally Bonded Fibre Reinforced Polymer Composites to Enhance the Seismic Resilience of Single Shear Walls: A Nonlinear Time History Assessment

Abbaszadeh,

Chaallal

2024

J. Compos. Sci.

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In medium- to high-rise buildings, single shear walls (SSWs) are often used to resist lateral force due to wind and earthquakes. They are designed to dissipate seismic energy mainly through plastic hinge zones at the base. However, they often display large post-earthquake deformations that can give rise to many economic and safety concerns within buildings. Hence, the primary objective of this research study is to minimize residual deformations in existing SSWs located in the Western and Eastern seismic zones of Canada, thereby enhancing their resilience and self-centering capacity. To that end, four SSWs of 20 and 15 stories, located in Vancouver and Montreal, were meticulously designed and detailed per the latest Canadian standards and codes. The study assessed the impact of three innovative strengthening schemes on the seismic response of these SSWs through 2D nonlinear time history (NLTH) analysis. All three strengthening schemes involved the application of Externally Bonded Fiber Reinforced Polymer (EB-FRP) to the shear walls. Accordingly, a total of 208 NLTH analyses were conducted to assess the effectiveness of all strengthening configurations. The findings unveiled that the most efficient technique for reducing residual drift in SSWs involved applying three layers of vertical FRP sheets to the extreme edges of the wall, full FRP wrapping the walls, and full FRP wrapping of the plastic hinge zone. Nevertheless, it is noteworthy that implementing these strengthening schemes may lead to an increase in bending moment and base shear force demands within the walls.

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Section: Residual Displacement Of Walls 621 Walls In Vancouvermentioning

confidence: 84%

Section: Shear Force Demandmentioning

confidence: 99%

The Use of Externally Bonded Fibre Reinforced Polymer Composites to Enhance the Seismic Resilience of Single Shear Walls: A Nonlinear Time History Assessment

Abbaszadeh,

Chaallal

2024

J. Compos. Sci.

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“…The model scheme used for the 20‐story tall wall prototype in Figure 4 consisted of four displacement‐based elements for each story height, as recommended from previously validated models to accurately simulate the flexural response of slender walls 9,10 . Shear deformations can account for approximately 10% of the total measured lateral deformations, 2,11 so equivalent linear‐elastic zero‐length shear springs were introduced at one‐fourth and three‐fourths height of story height to account for the shear response.…”

Section: Model Descriptionmentioning

confidence: 99%

Investigation of reinforcement curtailment in tall lightly reinforced structural concrete walls

Deng,

Henry

2024

Structural Design Tall Build

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SummaryRecent studies have investigated the impact of minimum longitudinal reinforcement limits on the ductility of the plastic hinge region of reinforced concrete (RC) walls, resulting in revised minimum reinforcement limits in design standards. The objective of this research was to investigate the influence of the longitudinal reinforcement distribution or termination rules for the additional reinforcement at the end regions of the wall up the wall height on the response of taller lightly RC walls. A model utilizing a displacement‐based fiber element was developed and validated against tested walls with a range of longitudinal reinforcement contents. Pushover analyses were then conducted on a 20‐story wall prototype to investigate the sensitivity of key design parameters, including axial load pattern, curtailment heights of the longitudinal reinforcement in the plastic hinge region, reinforcement content at wall base, reinforcement strain‐hardening ratio, and the length over which the reinforcement curtailment occurred. The results indicate that the current minimum reinforcement provisions in ACI 318–19 are insufficient to prevent reinforcement yielding outside the plastic hinge region at the wall base.

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“…Using seismic probability risk assessment and probabilistic seismic demand analysis (PSDA) on experimental data, they determined the seismic demand levels and the corresponding fragility curves. Arabzadeh and Galal [29] investigated the sensitivity and effect Assessment of fragility curve for steel frame construction under different categories of earthquakes of fiber-reinforced polymer (FRP) retrofitting on the seismic collapse of the system for various tensional effect levels and determined the practical strengthening layout produced by FRP and advanced fragility curves. Faghihmaleki et al [30] examined a probabilistic framework for the multi-hazard risk associated with the collapse limit state of a G+8 RC moment frame with a shear wall using the Seismostruct software under the blast and seismic loading conditions and generated fragility curves.…”

Section: Introductionmentioning

confidence: 99%

Assessment of fragility curve for steel frame construction under different categories of earthquakes

Lakušić¹

2022

JCE

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The aim of this study is to investigate the effect of two categories of earthquake events on the fragility curves of steel building construction (structures with different number of stories) by considering relative lateral displacement as a damage criterion. The categories used to describe the change in the relative lateral position were chosen to be slight, moderate, extensive, and complete. Increased seismic demand increases the probability of exceeding. In other words, the greater the maximum earthquake acceleration, the higher is the probability of exceeding (PoE). In a 3-story structure, the increase in PGA increases the PoE of the structure at extensive failure levels. The fragility curves for the 2nd category earthquakes show a shift from the sleeping mode (gradual increase) to the standing state (rapid increase) compared to the 1st-class earthquakes in the 5-story model. Increasing the number of stories increases the PoE of extensive and large failures. The PoE of the extensive mode in the 7-story model was 10 and 15.5 % higher than that in the 5- and 3-story models, respectively. However, for the complete damage state, the PoE in the 5-story model was 6 and 7 % more than that in the 7- and 3-story models, respectively. Therefore, it can be concluded that increasing the number of stories increases the PoE, but this increase is more evident for the extensive failure level.

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Seismic Collapse Risk Assessment and FRP Retrofitting of RC Coupled C-Shaped Core Walls Using the FEMA P695 Methodology

Cited by 23 publications

References 27 publications

The Use of Externally Bonded Fibre Reinforced Polymer Composites to Enhance the Seismic Resilience of Single Shear Walls: A Nonlinear Time History Assessment

The Use of Externally Bonded Fibre Reinforced Polymer Composites to Enhance the Seismic Resilience of Single Shear Walls: A Nonlinear Time History Assessment

Investigation of reinforcement curtailment in tall lightly reinforced structural concrete walls

Assessment of fragility curve for steel frame construction under different categories of earthquakes

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