Modeling of Precast Reinforced Concrete Beam-column Joints Under Cyclic Loading

Tarabia, Ahmed M.; Etman, Emad; Allam, Said M.; Aboelhassan, Mohamed Gamal

doi:10.1080/13632469.2021.1964651

Cited by 3 publications

(3 citation statements)

References 29 publications

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“…To predict the cyclic behavior of bolted-type precast reinforced beam-column connections. Ahmed Tarabia et al (2021) proposed a non-linear finite element model that takes into account the effects of reinforcing bar slip, relative rotation, in-elastic shear response, and interface shear transfer in the beam-column joint. According to the verified model results, the precast bolted connection with shear reinforcement in the shear key zone had about 50% less shear slip, more initial stiffness, and better energy dissipation than the precast bolted specimen without shear reinforcement (A. M. Tarabia, Etman, Allam, & Aboelhassan, 2021).…”

Section: Literature Reviewmentioning

confidence: 99%

Cyclic performance of emulative precast beam to column con-nection with corbel using dowel bar

Rajeswari

KP²

2022

rdlc

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The objective of this study is to examine the seismic performance of exterior and interior types of an emulative precast beam to column connection, constructed with grouted steel dowel bar and cast-in-situ concrete under quasi-static reversed cyclic loading. The dowel bar connection between the precast structural elements is achieved by inserting the dowel bar into the column corbel's holes and the precast portion of the beam. To secure the dowel bar's anchorage, these holes are packed with non-shrinkage grout and then cast-in-situ concreting is done in the joint core and the entire upper segment of the precast beam. In the past, particularly after an earthquake in the Emilia-Romagna region of Italy in May 2012 (Ercolino, Magliulo, & Manfredi, 2016), witnessed damage to precast reinforced concrete structures was more likely to occur in the precast beam-column joint section. Hence, it’s essential to improve the performance of the beam-column joint to withstand all possible lateral load combinations, which are to be included in the design and detailing of the precast structural components. This study analyzed an eight-story RC frame building for earthquake loading using Staad.Pro software. The exterior and interior types of proposed beam-column connections were designed and detailed using the design forces and moments computed by the Staad.Pro analysis, in accordance with the Indian standard codes (IS 456, 2000), (IS 1893, 2016)and (IS 13920, 2016). The beam-column joint behavior under quasi-static cyclic loading was studied using one-third scaled-down test specimens, i.e., monolithic (MBC-EJ & MBC-IJ) and emulative beam-column (EBC-EJ & EBC-IJ) exterior and interior joints. In that proposed emulative connection, the structural continuity and compatibility between the precast elements were achieved through the corbel with the dowel bar and cast-in-situ concreting. The test specimen’s ultimate and yield load carrying capacity, energy dissipation capacity, stiffness degradation, and ductility parameters were determined based on the obtained load-displacement hysteresis relationship. Based on the findings, the precast exterior joint specimens (EBC-EJ) were found to be 14.36% more ductile and 13.23% more energy dissipative than monolithic exterior joint specimens (MBC-EJ). Similarly, precast interior joint specimens (EBC-IJ) outperformed monolithic interior joint specimens (MBC-IJ) by 6.27% more ductility and 16.86% more energy dissipation. Therefore, the experimental results confirmed that using grouted dowel bars and wet concreting in the joint area enhances rigidity and structural continuity, as well as improves the ultimate strength of precast connections to a level that closely resembles typical monolithic beam-column joints.

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Section: Literature Reviewmentioning

confidence: 99%

Cyclic performance of emulative precast beam to column con-nection with corbel using dowel bar

Rajeswari

KP²

2022

rdlc

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“…On column, there is no axial force applied throughout the period of testing. [33][34][35] At both, push and pull direction, displacement regulated hysteric loading was applied on the samples. The load cell and linear variable differential transformer (LVDT) used to estimate the loading as well as displacement.…”

Section: Hysteric Testmentioning

confidence: 99%

“…The beam remains straight in the position and becomes tightly attached with the device. On column, there is no axial force applied throughout the period of testing 33–35 . At both, push and pull direction, displacement regulated hysteric loading was applied on the samples.…”

Section: Sample Properties and Test Proceduresmentioning

confidence: 99%

Experimental investigation on hysteric loading characteristics of fly ash as fractional substitute of cement in reinforced concrete beam‐column connection at curing of 90 days

Shaw

Ghosh

Dey

et al. 2021

Structural Concrete

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Fly ash becomes a fine gray particles consisting generally of globular, smooth particles available in coal-fired power stations. In this work, the seismic performance of beam-column connection (BCC) has been examined by applying fly ash as a surrogate of cement. Five different samples of BCC's, with or without admixtures were casted as well as examined in order to obtain the hysteric loading characteristics for a curing period of 90 days. The tested samples designed for M25 grade of concrete having water-binder ratio maintaining as 0.4. From the study, it has been found that BCC sample having 20% fly ash along with super plasticizer subjected to 90 days curing (i.e., BCC sample of 20FAS90) exhibits a better performance as compared to the other tested samples. The BCC sample of 20FAS90 showed higher displacement as compared to controlled concrete without fly ash and super plasticizer at 90 days (Control90). Also, from the experimental work, it has been found that 20FAS90 sample possesses 18% higher ductility as well as 70% higher energy dissipation than the Control90 sample. Additionally, regarding brittleness index (BI) of 20FAS90 sample exhibits 25% lower as compared to Control90 sample. Furthermore, the stiffness degradation of the sample becomes slightly higher than the controlled concrete. Therefore, the paper essentially highlights the importance of fly ash and super plasticizer on the dynamic performance of the BCC samples at 90 days curing period such that an advanced mix design criterion could be put forward for optimum replacement of cement leading to higher safety aspects.

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