Evaluation of code compliant/non-compliant ECC-RC IMRF structures

Khan, Fasih Ahmed; Khan, Sajjad Wali; Rashid, Muhammad Mahbubur; Rizwan, Muhammad; Fahim, Muhammad; Shahzada, Khan; Ahmad, Naveed; Badrashi, Yasir Irfan; Qazi, Samiullah; Said, Imad

doi:10.1016/j.istruc.2021.03.070

Cited by 4 publications

(2 citation statements)

References 27 publications

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“…Only one-time history was used to study the dynamic behaviour and amplitude was scaled from 5% to 100% for the excitation of the model up to the near-collapse state. This method of constructing force-displacement capacity curve used in other studies (Ahmad et al, 2018a(Ahmad et al, , 2018b(Ahmad et al, , 2019Akbar et al, 2018;Khan et al, 2021;Rizwan et al, 2020;Ullah et al, 2020) was considered appropriate and hence used in the current study as well. The time history had a maximum PGA equal to 0.57 g, with a maximum velocity of 518 mm/s and a maximum displacement of 90 mm.…”

Section: Input Excitation and Loading Protocolsmentioning

confidence: 99%

Seismic performance of RC-ECC composite frame by eliminating shear reinforcement in beam-column joint: Shake table tests

Khan

2022

Advances in Structural Engineering

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The inherent vulnerability of beam-column joints to seismic loading and steel congestion are two major research problems connected with beam-column joints of moment-resisting frames. The experimental study presented herein addresses these research questions and seeks to solve them by using Polyvinyl Alcohol based Engineered Cementitious Composite (PVA-ECC) in beam-column joints without transverse shear reinforcement. The study included the manufacture and shake table testing of two 1:3 reduced scale one bay two-story moment-resisting frame models using simulated earthquake motions. To evaluate the performance of ECC beam-column joints without shear reinforcement, two frame models, one with and the other without shear reinforcement in the beam-column joints, were prepared and tested. The acceleration time history record of the 1994 Northridge Earthquake USA was used for the excitation of specimens at different levels to produce progressive damage up to the near collapse state. The observed damage mechanism of tested models was recorded, and the response parameters, including floor displacement and acceleration, were measured. The measured data was processed to develop a lateral force-displacement envelope curve for the supposed prototype frames and calculate their seismic design factors (ductility, overstrength, and response modification). Comparison of the seismic performance parameters of the two prototype frames reveal that the ECC beam/column joint without shear ties performed marginally inferior to the ECC beam-column joints having shear ties but it still achieved a 75% larger R-factor compared with the code specified value.

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Section: Input Excitation and Loading Protocolsmentioning

confidence: 99%

Seismic performance of RC-ECC composite frame by eliminating shear reinforcement in beam-column joint: Shake table tests

Khan

2022

Advances in Structural Engineering

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“…This significant tensile strength of ECC is of great importance in improving structural performance in terms of deformation and load-carrying capacities [11]. Strategic use of ECC in conventional reinforced concrete members is found to be very useful [12] in addressing the inherent weaknesses in conventional concrete: from poor ductility and low tensile strength to low energy absorption capacity to lack of self-healing and sulphate-resistant capability [13][14][15][16][17]. The experimental studies carried out by some authors showed that the inherent brittleness of concrete could be overcome through such materials.…”

Section: Introductionmentioning

confidence: 99%

Flexural Performance of Composite RC Beams Having an ECC Layer at the Tension Face

Khan

Ali²,

Khan³

et al. 2023

Period. Polytech. Civil Eng.

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This paper presents an experimental study on the flexural behavior of composite Reinforced Concrete (RC) beams having a monolithic Engineered Cementitious Composites (ECC) layer at the tension face. Due to the brittle nature of normal concrete, clear cover on the tension side of beam cracks results in spalling and corrosion of reinforcement. The proposed technique overcomes the inherent brittle behavior of normal concrete with the incorporation of ECC on the tension face. This also helps in reducing bond-splitting, cover-spalling, and buckling of reinforcement in RC flexural members. For testing purposes, six full-scale beam specimens (225 mm x 300 mm x 2400 mm) with the same reinforcement were cast and tested. Out of six, two specimens were made of conventional concrete, whereas the remaining four (two each) had an ECC layer of 75mm and 100mm thick at the tension face respectively. Each specimen was installed with three strain gauges (one each at the midspan top & bottom surface of concrete and one midspan rebar on the tension face) and one LVDT at midspan. The samples were then subjected to simple monotonic loading under a third-point bending test as per ASTM C78. The load-displacement, stress-strain and moment-curvature curves were obtained for all the tested specimens. It was found that ECC-strengthened beam samples displayed an increased flexural performance at first crack, yield, and ultimate load-carrying capacity as compared to conventional RC specimens. Whereas a better crack arrest with even distribution of cracks and improvement in ductility was observed for the ECC-strengthened composite beams.

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Seismic performance of deficient reinforced concrete frames retrofitted with eccentric steel braces

Pervez

Khan

Alam

et al. 2022

Innov. Infrastruct. Solut.

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Evaluation of code compliant/non-compliant ECC-RC IMRF structures

Cited by 4 publications

References 27 publications

Seismic performance of RC-ECC composite frame by eliminating shear reinforcement in beam-column joint: Shake table tests

Seismic performance of RC-ECC composite frame by eliminating shear reinforcement in beam-column joint: Shake table tests

Flexural Performance of Composite RC Beams Having an ECC Layer at the Tension Face

Seismic performance of deficient reinforced concrete frames retrofitted with eccentric steel braces

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