Flexural performance of precast circular reinforced concrete members with intermediate connection filled with ultra-high-performance-concrete

Hamoda, Ahmed; Ahmed, Mizan; Ghalla, Mohamed; Liang, Qing Quan; Abadel, Aref A.

doi:10.1016/j.cscm.2023.e02386

Cited by 12 publications

(3 citation statements)

References 27 publications

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“…The tangential action is considered by using penalty function friction model with a penalty friction coefficient of 0.6. 33,34…”

Section: Description Of Finite Element Modelmentioning

confidence: 99%

Seismic behavior of prefabricated frame with special‐shaped concrete‐filled steel tubular columns and H‐shaped steel beams

Zhang,

Wang,

Dong

et al. 2024

Structural Concrete

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To realize the prefabricated structure of special‐shaped concrete‐filled steel tubular (CFST) column frame and enhance the level of indoor room utilization, this paper proposed a novel prefabricated frame with special‐shaped CFST columns and H‐shape steel beams connection with side plate. To investigate seismic behavior of this prefabricated frame structure, a 2‐story and 2‐bay CFST frame specimen was fabricated and tested under reversed cyclic loading. The failure mode, hysteresis behavior, degradation of lateral stiffness and bearing capacity, ductility and energy dissipation were analyzed. Experiment results indicated that failure mode presented strong columns and weak beams. Hysteresis curve of frame showed fully shuttle‐shaped. The mean story drift angle was 1/36 at ultimate stage. Equivalent viscous damping coefficient was 0.038–0.464. The bearing capacity degradation was relatively gentle, but the overall stiffness degradation was more obvious. It suggested that the frame had proper seismic and energy dissipation property. After the test, the seismic property of test frame was further investigated through the numerical simulation approach. The failure mode and skeleton curve obtained from the simulation were nearly consistent with test results, indicating that numerical analysis results were precise and with high reference meaning.

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“…The tangential action is considered by using penalty function friction model with a penalty friction coefficient of 0.6. 33,34…”

Section: Description Of Finite Element Modelmentioning

confidence: 99%

Seismic behavior of prefabricated frame with special‐shaped concrete‐filled steel tubular columns and H‐shaped steel beams

Zhang,

Wang,

Dong

et al. 2024

Structural Concrete

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“…It was found that the column fails due to the buckling of the steel bar and the possibility of shear failure at the bottom of the columns is unlikely. Recently, Hamoda et al (2023a) carried out tests on PC beams with intermediate connection under flexural loading. Normal Concrete (NC), Strain Hardening Cementitious Composite (SHCC), and Ultra-High-Performance-Concrete (UHPC) were used to cast intermediate connection.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigations of precast circular reinforced concrete slender columns with intermediate connection

Hamoda,

Ahmed,

Abadel

et al. 2023

Advances in Structural Engineering

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This paper carries out experimental and numerical investigations on the axial performance of circular Reinforced Concrete (RC) precast slender columns with an intermediate connection. A series of tests are carried out to study the effects of longitudinal reinforcement ratio (ρ), and embedded length of steel bars (Lb) of precast columns on their axial performance under concentric loading. Test results show that increasing the reinforcement ratio and the embedded length of the precast columns significantly improves the axial performance of the precast slender columns. Nonlinear finite element models (FEM) are developed to simulate the performance of the columns experimentally observed. The accuracy of the FEM is validated against the test results and found to reasonably predict the axial performance of tested columns.

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“…Currently, different methods are used in strengthening the concrete members. 29,30 The researcher primarily used steel plates bonded to the column via epoxy, 31 but this method led to severe corrosion issues. Handling long and heavy steel plates on the construction site proved difficult.…”

Section: Introductionmentioning

confidence: 99%

Rehabilitation of post‐heated rectangular reinforced concrete columns using different strengthening configuration

Abadel

2023

Structural Concrete

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It is common knowledge that increased temperatures have a negative impact on the axial load‐capacity and stiffness of reinforced concrete (RC) rectangular columns. This is something that is commonly acknowledged. For the purpose of restoring the axial capacity and stiffness of heat‐damaged RC columns, it is absolutely essential to carefully pick a suitable method for strengthening and repairing the columns. This research paper investigates the performance of various strengthening methods, such as the use of carbon fiber‐reinforced polymer (CFRP) jackets with near‐surface mounted (NSM) steel bars and a combination of welded wire mesh (WWM) and CFRP strengthening techniques, for the rehabilitation of RC rectangular columns that have been damaged due to exposure to high temperatures. Specifically, the paper focuses on the performance of these methods in relation to the rehabilitation of RC rectangular columns. There were three groups of tested RC rectangular columns: pre‐heated and unstrengthened, post‐heated and unstrengthened, and post‐heated and strengthened. Over a period of 3 h, 600°C was applied to the heated columns. Both a scheme utilizing a combination of unidirectional CFRP strips and NSM steel bars and another utilizing a combination of unidirectional CFRP strips and WWM were evaluated. Axial compression tests were performed on each column until failure occurred. The experimental test outcomes revealed that exposure to high elevated temperatures led to a decrease in the axial load‐carrying capacity of 38.6% and a decrease of 75.9% in initial stiffness, compared to unheated RC columns. Both strengthening schemes proved effective in restoring and surpassing the initial load‐carrying capacity of undamaged RC rectangular columns by an average of 35%. Notably, the combination of CFRP strips and WWM exhibited superior performance in restoring the initial stiffness of post‐heated RC rectangular columns, representing a novel finding. The strengthening scheme employing WWM and CFRP recovered 61.3% of the lost axial strength caused by high temperature, while the NSM/CFRP scheme restored 34.5% of the lost axial strength. In addition, the utilization of NSM in combination with CFRP strips as well as utilization of the WWM and CFRP systems leads to stiffness enhancement of 52.1% and 123.7%, respectively, when compared to post‐heated and unstrengthened RC columns. However, the study's findings have clearly shown that combination of WWM and CFRP strips is efficient in enhancing the strength of heated and unheated damage RC beams.

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Flexural performance of precast circular reinforced concrete members with intermediate connection filled with ultra-high-performance-concrete

Cited by 12 publications

References 27 publications

Seismic behavior of prefabricated frame with special‐shaped concrete‐filled steel tubular columns and H‐shaped steel beams

Seismic behavior of prefabricated frame with special‐shaped concrete‐filled steel tubular columns and H‐shaped steel beams

Experimental and numerical investigations of precast circular reinforced concrete slender columns with intermediate connection

Rehabilitation of post‐heated rectangular reinforced concrete columns using different strengthening configuration

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