Experimental investigation of shear walls using carbon fiber reinforced polymer bars under cyclic lateral loading

Qi, Zhao; Zhao, Jun; Dang, Juntao; Chen, Jiwei; Shen, Fuqiang

doi:10.1016/j.engstruct.2019.04.052

Cited by 43 publications

(6 citation statements)

References 10 publications

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“…Mohamed et al [17] conducted an experimental investigation on the seismic behavior of shear walls reinforced with glass fiber reinforced polymer (GFRP) bars, and the result indicated that GFRP bar reinforced shear walls achieved reasonable strength and deformation requirements in addition to excellent recoverable deformation of up to a lateral drift of 2%. Zhao et al [18,19] verified the validity and applicability of using CFRP bars as longitudinal reinforcing bars in the edge zones of wall panel to reduce the residual deformation and damage.…”

Section: Introductionmentioning

confidence: 98%

Experimental study on seismic behavior of concrete walls with external magnetorheological dampers

Zhao

Luo

Zhang

et al. 2023

Smart Mater. Struct.

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A reinforcing method for developing a kind of shear wall with both excellent self-centering capacity and high energy dissipation was presented, in which carbon fiber reinforced polymer (CFRP) bars or steel strands were longitudinally placed to provide a restoring effect, while magnetorheological (MR) dampers were externally coupled with wall panels to provide extra energy dissipation. To verify the feasibility of this method, three slender concrete walls were tested under reversed cyclic lateral loading while subjected to constant axial compression with an axial load ratio of 0.26, of which one was reinforced with CFRP bars, the second one was reinforced with CFRP bars and two external MR dampers, and the third one was reinforced with steel strands and two external MR dampers. The results indicated that the test walls possessed remarkable load-resisting capacities even when the lateral drift was as large as 1.8% as well as a lateral deformation recovery rate of 74%–89% after unloading. Owing to external MR dampers, the initial stiffness and ductility were increased by 28.3% and 29.8%, respectively. In addition, a specific quantitative analysis showed that the dampers could increase the cumulative energy dissipation of shear walls by 16.6%, of which the contribution provided by MR damper was 64.8%, confirming the effectiveness of MR dampers in improving energy dissipation while preserving the self-centering capacity.

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Section: Introductionmentioning

confidence: 98%

Experimental study on seismic behavior of concrete walls with external magnetorheological dampers

Zhao

Luo

Zhang

et al. 2023

Smart Mater. Struct.

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“…A study on innovative methods to reduce residual displacement in coupled shear walls (CSWs) by Abbaszadeh and Chaallal [3] found that using fully wrapped FRP and vertical layers of EB-FRP can reduce inter-story drift, beam rotation, and residual inter-story drift in the walls located in Canadian seismic zones. In addition, various research studies have investigated alternative techniques for reducing residual deformation in shear walls, such as CFRP grids [19], hybrid CFRP grids-steel [20], and CFRP bars [21]. Nevertheless, there has been no emphasis on reducing residual displacement and increasing resilience and self-centering in pre-existing SSWs by employing EB-FRP sheets.…”

Section: Introductionmentioning

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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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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“…Song et al [40] performed experiments to evaluate the cyclic behavior of a hybrid approach combining CFRP grids and steel in six large-scale shear walls. Zhao et al [41] demonstrated that CFRP bars are an effective alternative to low-yield strain steel bars in reducing residual deformation in RC shear walls.…”

Section: Introductionmentioning

confidence: 99%

Resilience of Medium-to-High-Rise Ductile Coupled Shear Walls Located in Canadian Seismic Zones and Strengthened with Externally Bonded Fiber-Reinforced Polymer Composite: Nonlinear Time History Assessment

Abbaszadeh

Chaallal

2023

J. Compos. Sci.

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Coupled shear walls (CSWs) are structural elements used in reinforced concrete (RC) buildings to provide lateral stability and resistance against seismic and wind forces. When subjected to high levels of seismic loading, CSWs exhibit nonlinear deformation through cracking and crushing in concrete and yielding in reinforcements, thereby dissipating a significant amount of energy, leading to their permanent deformation. Externally bonded fiber-reinforced polymer (EB-FRP) sheets have proven to be effective in strengthening RC structures against various loading and environmental conditions. In addition, their high strength-to-weight ratio makes them an attractive solution as they can be easily applied without significantly increasing the structure’s weight. This study investigates the effectiveness of using EB-FRP sheets to reduce residual displacement in CSWs during severe earthquake loadings. Two series of 15-story and 20-story CSWs in Western and Eastern Canadian seismic zones, which serve as representative models for medium- and high-rise structures, were evaluated through nonlinear time history analysis. The numerical simulation of all CSWs and strengthened elements was carried out using the RUAUMOKO 2D software. The findings of this study provided evidence of the effectiveness of EB-FRP sheets in reducing residual deformation in CSWs. Additionally, significant reductions in the rotation of the coupling beams (CBs) and the inter-story drift ratio were observed. The results also revealed that bonding vertical FRP sheets to boundary elements and confining enhancement by wrapping CBs and wall piers is a very effective configuration in mitigating residual deformations.

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Experimental investigation of shear walls using carbon fiber reinforced polymer bars under cyclic lateral loading

Cited by 43 publications

References 10 publications

Experimental study on seismic behavior of concrete walls with external magnetorheological dampers

Experimental study on seismic behavior of concrete walls with external magnetorheological dampers

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

Resilience of Medium-to-High-Rise Ductile Coupled Shear Walls Located in Canadian Seismic Zones and Strengthened with Externally Bonded Fiber-Reinforced Polymer Composite: Nonlinear Time History Assessment

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