@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}
}