@article{nokey,

title = {Experimental Investigation on the Failure Behavior of Carbon Fiber Reinforced Polymer (CFRP) Strengthened Reinforced Concrete T-beams},

author = {Junaedi Utomo and Muhammad Nur Khusyeni and Windu Partono and Ay Lie Han and Buntara S. Gan},

url = {https://ced.petra.ac.id/index.php/civ/article/view/23978},

doi = {https://doi.org/10.9744/ced.23.2.115-122},

issn = {1979-570X},

year  = {2021},

date = {2021-10-05},

journal = {Civil Engineering Dimension},

volume = {23},

number = {2},

pages = {115-122},

abstract = {Carbon Fiber Reinforced Polymers (CFRP) are widely used as external concrete reinforcement. The behavior of T-beams strengthened in shear and flexure using CFRP sheets and plates was studied to analyze the load carrying capacity and failure mode as compared to conventional concrete members. The bonding response of the plate-to-concrete was investigated by comparing a specimen with a plate anchored at the far ends, one without anchoring. The sheets were in situ wet lay-up, the plate was pre-impregnated and pultruded during manufacturing. The test result suggested that this integrated strengthening method notably improved the load-carrying capacity, it was also demonstrated that anchoring had a positive but insignificant effect on the moment capacity and deformation. The influence of anchoring was noteworthy from the point of view that it shifted the failure mode from debonding to CFRP plate rupture. The most important factors influencing the behavior of CFRP strengthened beams are outlined.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {The Influence of External CFRP String Reinforcement on The Behavior of Flexural RC Elements},

author = {Junaedi Utomo and Nauval Rabbani and Sri Tudjono and Ay Lie Han and Sukamta},

url = {https://journal.uir.ac.id/index.php/JGEET/article/view/5685},

doi = {10.25299/jgeet.2021.6.3.5685},

issn = {2541-5794},

year  = {2021},

date = {2021-09-17},

journal = {JGEET (Journal of Geoscience, Engineering, Environment, and Technology)},

volume = {6},

number = {3},

pages = {141 - 146},

abstract = {External reinforcement is an excellent method for improving the load carrying capacity and ductility behaviour of reinforced concrete members in flexure. Enhancement becomes a necessity when current standards mandate a higher performance compared to older codes. External reinforcement is an environmentally friendly and sustainable solution, since demolition and re-building could be postponed, and the building can be used while work in conducted on the members. Carbon Fiber Reinforced Polymers (CFRP), having a low weight-to-volume ratio and an excellent resistance to corrosion, can be used as external reinforcement to effectively increase the flexural and shear strength of a member. To evaluate the effectiveness of CFRP strings, two types of reinforced concrete T-beams were tested. The specimens consist of a strengthened member in both shear and flexure using CFRP wraps and CFRP strings, and a conventional reinforced concrete beam. The specimens were subjected to a one-point-loading system to simulate high shear stresses in combination with a maximum bending moment at mid-point. The installation of CFRP strings was conducted using the Near Surface Mounted (NSM) method, while the sheets were Externally Bonded Reinforcement (EBR). The strings and sheets were impregnated and pultruded on side. The test results showed that the strings and wraps substantially increased the ultimate load carrying capacity and ductility of the member. The ultimate load enhancement was found to be 32% from 117kN to 154kN, and the vertical deformation improved 25% from 16 mm to 20 mm. The failure mode was characterized by initial debonding of the strings in the interface between the strings and the epoxy, followed by string-rupture. The two strings ruptured concurrently, due to stress re-distribution within the member.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {The development of A Simulation Tool for Numerical Modelling of High Flexure and High Shear Reinforced Concrete Elements},

author = {Nuroji and Mhd. Rony Asshidiqie and Sukamta and Han Ay Lie

},

url = {https://ejournal.undip.ac.id/index.php/teknik/article/view/32683},

doi = {https://doi.org/10.14710/teknik.v42i2.32683},

issn = {2460-9919},

year  = {2021},

date = {2021-08-31},

urldate = {2021-08-31},

journal = {Jurnal Ilmiah Bidang Ilmu Kerekayasaan},

volume = {42},

number = {2},

pages = {106 - 116},

abstract = {The weakness of full-scale testing of reinforced concrete elements in a laboratory is the long period, both to prepare and test specimens and the high-cost, resulting in a limited number of specimens. The heavy specimen creates another difficulty during set-up. Data accuracy depends on apparatus precision, laboratory conditions, and the technicians' expertise in experimenting. A finite element model was constructed to simulate a reinforced concrete element subject to high flexure and shear stresses induced by vertical and horizontal forces to overcome these constraints. The model can further be utilized to evaluate the effects of independent variables on the behavior of the member. The model was validated both numerically and experimentally to ensure accuracy and precision. The numerical validation was conducted through a sensitivity analyses process on the finesses of meshing and loading incrementation. At the same time, the load-deformation data and the crack propagation of identical laboratory-tested elements were utilized for validation of the experimental data. It was proven that the developed model predicts the behavior of the beam to a high degree of correctness. The model can further be used as a tool for analyses in the field.

},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{95,

title = {Numerical parametric study on the flexural capacity of reinforced concrete beams strengthened with non-metallic materials},

author = {Yanuar Haryanto And Hsuan-teh Hu And Ay L. Han And Fu-pei Hsiao And Nanang G. Wariyatno And Banu A. Hidayat},

url = {https://hanaylie.id/wp-content/uploads/2021/08/16_4_37.pdf

http://jestec.taylors.edu.my/V16Issue4.htm},

year  = {2021},

date = {2021-08-01},

journal = {Journal of Engineering Science and Technology (JESTEC)},

volume = {16},

number = {4},

pages = {3295 - 3311},

abstract = {A modified compression field theory and models developed with Response-2000 using the theory were applied to the prediction of the flexural capacity of reinforced concrete beams strengthened with the assistance of non-metallic material such as bamboo. Data were retrieved from earlier studies conducted in 2017 and two RC beams were used as specimens with one designed as the control beam (BC) while the other was strengthened through a near-surface mounted technique using four bamboo strips (BB). The study showed the accuracy of the models developed in predicting the responses of load-deflection up to the peak load, but underestimated figures were generally obtained from the predictions of beam ductility with an average of 34.41% difference. The models also provided conservative predictions of the flexural capacity for the beams with the ratios of 1.16 and 1.04 for BC and BB respectively. Moreover, the model developed was observed to be efficient in making quick and accurate predictions on the flexural strength based on a normalized mean square error (NMSE) of 0.006 and also has the ability to determine the conditions with the potential to cause the collapse of the reinforced concrete beams. Furthermore, the validated model was later used

to study the impact of bamboo diameter, concrete compressive strength, and steel reinforcement ratio on strengthened beams behaviour.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{86,

title = {Negative moment region flexural strengthening system of RC T-beams with half-embedded NSM FRP rods: a parametric analytical approach},

author = {Yanuar Haryanto and Hsuan-Teh Hu and Ay Lie Han and Fu-Pei Hsiao,Charng-Jen Teng and Banu Ardi Hidayat and Nanang Gunawan Wariyatno},

url = {https://www.tandfonline.com/doi/full/10.1080/02533839.2021.1936646},

doi = {https://doi.org/10.1080/02533839.2021.1936646},

issn = {2158-7299},

year  = {2021},

date = {2021-06-21},

journal = {Journal of the Chinese Institute of Engineers },

abstract = {Fiber Reinforced Polymer (FRP) rods are considered to be the most effective in retrofitting to increase the strength of reinforced concrete (RC) structures through Near-Surface Mounted (NSM) technique. There are, however, frequent cases encountered by engineers where the embedment depth mandated by ACI 440.2 R-08 code is not achievable in the field implementation. It has also been discovered that it is more challenging to strengthen the negative moment region of concrete members in comparison with the positive region. This research was conducted to determine the behavior of RC T-beams strengthened in the negative moment region using half-embedded NSM FRP rods. The findings were associated with the Modified Compression Field Theory (MCFT) which was applied in the analytical models. The model proposed was validated through a comparison with previous experimental study that showed half-embedded NSM FRP was effective as another method in comparison with the conventional soffit strengthening systems in retrofitting RC T-beams in the negative moment region, and good agreement was obtained. After that, a parametric analysis was initiated to determine the influence of FRP rod diameters, the compressive strength of concretes, the ratio of steel reinforcement as well as the materials used for the FRP on the flexural behavior of strengthened beams.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}