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

@article{85,
title = {Design Philosophy for Buildings’ Comfort-Level Performance},
author = {Nanang Gunawan Wariyatno and Han Ay Lie and Fu-Pei Hsiao and Buntara Sthenly Gan},
url = {https://ojs.imeti.org/index.php/AITI/article/view/7309},
doi = {https://doi.org/10.46604/aiti.2021.7309},
year = {2021},
date = {2021-05-27},
journal = {Advances in Technology Innovation},
volume = {6},
number = {3},
pages = {157 - 168},
abstract = {The data reported by Japan Meteorological Agency (JMA) show that the fatal casualties and severe injuries are due to heavy shaking during massive earthquakes. Current earthquake-resistant building standards do not include comfort-level performance. Hence, a new performance design philosophy is proposed in this research to evaluate the quantitative effect of earthquake-induced shaking in a building. The earthquake-induced response accelerations in a building are analysed, and the response accelerations related with the characteristic property of the building are used to evaluate the number of Seismic Intensity Level (SIL). To show the indispensability of the newly proposed comfort-level design philosophy, numerical simulations are conducted to evaluate the comfort level on different floors in a building. The results show that the evaluation of residents’ comfort levels should be considered in the current earthquake-resistant building design codes.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{84b,
title = {Seismic behavior and failure modes of non-ductile three-story reinforced concrete structure: A numerical investigation},
author = {
Banu A. Hidayat and Hsuan-Teh Hu and Fu-Pei Hsiao and Ay Lie Han and Lisha Sosa and Li-Yin Chan and Yanuar Haryanto},
url = {http://www.techno-press.org/content/?page=article&journal=cac&volume=27&num=5&ordernum=6},
doi = {http://dx.doi.org/10.12989/cac.2021.27.5.457},
year = {2021},
date = {2021-05-05},
journal = {Computers and Concrete},
volume = {27},
number = {5},
pages = {457-472},
abstract = {Reinforced concrete (RC) buildings in Taiwan have suffered failure from strong earthquakes, which was magnified by the non-ductile detailing frames. Inadequate reinforcement as a consequence of the design philosophy prior to the introduction of current standards resulted in severe damage in the column and beam-column joint (BCJ). This study establishes a finite element analysis (FEA) of the non-ductile detailing RC column, BCJ, and three-story building that was previously tested through a tri-axial shaking table test. The results were then validated to laboratory specimens having the exact same dimensions and properties. FEA simulation integrates the concrete damage plasticity model and the elastic-perfectly plastic model for steel. The load-displacement responses of the column and BCJ specimens obtained from FEA were in a reasonable agreement with the experimental curves. The resulting initial stiffness and maximum base shear were found to be a close approximation to the experimental results. Also, the findings of a dynamic analysis of the three-story building showed that the time-history data of acceleration and displacement correlated well with the shaking table test results. This indicates the FEA implementation can be effectively used to predict the RC frame performance and failure mode under seismic loads.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{81b,
title = {Load-carrying capacity and failure mode of composite steel-concrete truss element under monotonic loading},
author = {Nanang Gunawan Wariyatno and Yanuar Haryanto and Ay Lie Han and Buntara Sthenly Gan and Gathot Heri Sudibyo},
url = {https://iopscience.iop.org/article/10.1088/1757-899X/982/1/012032},
doi = {https://doi.org/10.1088/1757-899X/982/1/012032},
year = {2021},
date = {2021-05-01},
journal = {IOP Conf. Series: Materials Science and Engineering},
volume = {982},
number = {1},
pages = {1-6},
abstract = {Composite steel-concrete trusses are among the most economical systems for building, particularly for greater spans, allowing proper internal space utilization without limiting columns. This paper examines 12 lab tests on two types of composite steel-concrete truss elements compared with the conventional steel truss element as a control specimen. The experiments investigate the load-carrying capacity of the truss element with different configurations under monotonic loading. The study on the specimen's failure modes was based on the welded joints. The obtained results were compared with analytical evaluations of typical resisting mechanisms of steel-concrete composite, reinforced concrete, and steel structures with updated Indonesian design codes. The basic features of the steel-concrete truss elements discussed quantitatively and qualitatively.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{82,
title = {Seismic Retrofitting of Irregular Pre-80s Low-rise Conventional RC Building Structures},
author = {Han Ay Lie and Junaedi Utomo and Hsuan-Teh Hu and Lena Tri Lestari},
url = {https://ced.petra.ac.id/index.php/civ/article/view/23577},
doi = {https://doi.org/10.9744/ced.23.1.9-19},
issn = {1410-9530},
year = {2021},
date = {2021-04-20},
journal = {Civil Engineering Dimension},
volume = {23},
number = {1},
pages = {9-19},
abstract = {A resilience and seismic safety evaluation method of under-qualified concrete structures designed based on codes prior to the introduction of earthquake provisions is presented. A numerical method for evaluating and improving a structure’s performance and resilience through jacketing and Carbon Fiber Reinforced Polymers (CFRP) retrofitting was developed. The model analyzed the structure’s existing condition, inadequate elements were identified, and segments that required strengthening were determined. Retrofitting and external reinforcing techniques were applied, and their effectiveness evaluated. Elements identified as insufficient were subjected to a strengthening iteration process to ensure that all qualifications were fulfilled. It was proven that the numerical simulation was accurate, cost-effective and time-saving in evaluating deficient structures and the effectiveness of their strengthening methods. The numerical model and analysis in conjunction with the technology of jacketing and CFRP retrofitting provide a fast and straightforward solution for older structures in ameliorating their resilience and overall performance},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{88,
title = {Nonlinear 3D Model of Double Shear Lap Tests for the Bond of Near-surface Mounted FRP Rods in Concrete Considering Different Embedment Depth},
author = {Yanuar Haryanto and Hsuan-Teh Hu and Ay Lie Han and Fu-Pei Hsiao and Charng-Jen Teng and Banu Ardi Hidayat and Laurencius Nugroho},
url = {https://pp.bme.hu/ci/article/view/17309},
doi = {https://doi.org/10.3311/PPci.17309},
year = {2021},
date = {2021-04-06},
journal = {Periodica Polytechnica Civil Engineering},
abstract = {The utilization of near-surface mounted Fiber Reinforced Polymer (FRP) reinforcement as a method of strengthening in reinforced concrete structures has increased considerably in recent years. Moreover, the application of double-shear lap tests for this rein- forcement method leads to the achievement of a local bond-slip behavior in a bonded joint. This research, therefore, focused on 3-D modeling of this type of test to suitably characterize the bond mechanics between FRP rods and concrete at various embedment depth. The use of different alternatives to represent the interface between the FRP rod and concrete were analyzed after which a comparison was drawn between the numerical finite element (FE) simulations and experimental measurements. The results showed the prediction of the load–slip corresponded with the data obtained from the experiment. Finally, the proposed model has the ability to express the relationship between the penalty stiffness parameters in shear direction Kss = (Ktt) and the embedment depth of FRP rods.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{87,
title = {Enhancement of flexural performance of RC beams with steel wire rope by external strengthening technique},
author = {Yanuar Haryanto and Ay Lie Han and Hsuan-Teh Hu and Fu-Pei Hsiao and Banu Ardi Hidayat and Arnie Widyaningrum},
url = {https://www.tandfonline.com/doi/pdf/10.1080/02533839.2021.1871651?needAccess=true},
doi = {https://doi.org/10.1080/02533839.2021.1871651},
year = {2021},
date = {2021-02-02},
journal = {Journal of the Chinese Institute of Engineers},
volume = {44},
number = {3},
pages = {193-203},
abstract = {Reinforced concrete structures around the world need repairing or strengthening at some stage in their lifetimes for different reasons. Steel wire rope is one of the potential materials to strengthen reinforced concrete structures do to its high strength, lightweight, and high flexibility properties. This research was, therefore, conducted to investigate a relatively new technique to strengthen reinforced concrete beams using external steel wire ropes. This involved testing five beam specimens under a four-point bending configuration for failure, and the strengthening effects of external wire ropes on their performance were also studied. The results showed the ultimate load capacity was also significantly enhanced up to 250% compared to the control specimen. Moreover, the stiffness and energy absorption capacity of the strengthened specimens were improved due to the external strengthening technique. This means reinforced concrete beams strengthened with external steel wire rope are capable of fulfilling the flexural performance required for reinforced concrete structures.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{84,
title = {Investigation on Structural Behaviour of Bamboo Reinforced Concrete Slabs under Concentrated Load},
author = {Yanuar Haryanto and Nanang Gunawan Wariyatno and Hsuan-Teh Hu and Ay Lie Han and Banu Ardi Hidayat},
url = {http://www.ukm.my/jsm/pdf_files/SM-PDF-50-1-2021/22.pdf
},
doi = {http://dx.doi.org/10.17576/jsm-2021-5001-22},
year = {2021},
date = {2021-01-30},
journal = {journal of Sains Malaysiana (SCI)},
volume = {50},
number = {1},
pages = {227-238},
abstract = {Reinforced concrete is perhaps the most widely used building material in the world. However, the materials used
for reinforcement of concrete i.e. steel is quite expensive and scarcely available in the developing world. As a result,
bamboo is considered to be a cheaper replacement with high tensile strength. This research investigated the structural
behaviour of bamboo-reinforced concrete slabs used for footplate foundation subjected to concentrated load. For
this purpose, four different reinforced concrete slab panels were developed and analyzed. The influence of replacing
steel with bamboo for the reinforcement of concrete slabs on their structural behaviour was assessed by determining
the load-deflection characteristics, the ultimate load, the stiffness, the ductility, the cracking pattern, and the energy
absorption capacity. The results showed that in comparison to steel reinforced concrete slabs, the strength of 82% can
be acquired by the bamboo reinforced slabs. Furthermore, ductility demonstrated by the two types of specimens was
almost equivalent i.e. up to 93%. Those indicated that the structural behaviour demonstrated by bamboo reinforced
slabs is quite comparable to that of steel reinforced concrete slabs. Therefore, bamboo can prove to be a promising
substitute for steel in concrete reinforcement. Future studies may further examine this opportunity},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{79b,
title = {Flexural strength of concrete-galvalume composite beam under elevated temperatures},
author = {Agus Maryoto and Han Ay Lie and Hendrik Marius Jonkers},
url = {http://www.techno-press.org/?page=container&journal=cac&volume=27&num=1},
year = {2021},
date = {2021-01-03},
journal = {Computers and Concrete},
volume = {27},
number = {1},
pages = {13-20},
abstract = {In this paper, the elevated temperature on a concrete-galvalume composite beam's flexural strength based on the numerical and experimental methods is investigated. The strategy is to perform modeling and simulation of the flexural test based on finite element method (FEM) at room temperature and validate its results by using experiments at the same temperature. With material constants and boundary conditions set-up provided from the validation, we model and simulate the same flexural tests for the composite at higher temperatures. The study concludes that the flexural strength of the beam decreases at higher temperature. Additionally, it was shown that cracking moments is very sensitive to the temperature fluctuation and the failure modes are sensitive with respect to the elevated temperature.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{79,
title = {Seismic performance of non-ductile detailing RC frames: An experimental investigation},
author = {Banu A. Hidayat and Hsuan-Teh Hu and Fu-Pei Hsiao and Ay Lie Han and Panapa Pita and Yanuar Haryanto
},
url = {http://www.techno-press.org/content/?page=article&journal=eas&volume=19&num=6&ordernum=6
http://dx.doi.org/10.12989/eas.2020.19.6.485},
year = {2020},
date = {2020-12-01},
journal = {Earthquakes and Structures},
volume = {19},
number = {6},
pages = {485-498},
abstract = {Non-ductile detailing of Reinforced Concrete (RC) frames may lead to structural failure when the structure is subjected to earthquake response. These designs are generally encountered in older RC frames constructed prior to the introduction of the ductility aspect. The failure observed in the beam–column joints (BCJs) and accompanied by excessive column damage. This work examines the seismic performance and failure mode of non-ductile designed RC columns and exterior BCJs. The design was based on the actual building in Tainan City, Taiwan, that collapsed due to the 2016 Meinong earthquake. Hence, an experimental investigation using cyclic testing was performed on two columns and two BCJ specimens scaled down to 50%. The experiment resulted in a poor response in both specimens. Excessive cracks and their propagation due to the incursion of the lateral loads could be observed close to the top and bottom of the specimens. Joint shear failure appeared in the joints. The ductility of the member was below the desired value of 4. This is the minimum number required to survive an earthquake with a similar magnitude to that of El Centro. The evidence provides an understanding of the seismic failure of poorly detailed RC frame structures.
},
keywords = {},
pubstate = {published},
tppubtype = {article}
}