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Influence of bearing coefficient in cold-formed stainless steel bolted connection

ce/papers 2021年第2-4期4卷 148-155页

作者： Sobrinho, Kelvin da Silva, André T. Rodrigues, Monique C. Henriques, José A. Lima, Luciano R. da Vellasco, Pedro C. G. PGECIV - Civil Engineering Post-Graduate Program UERJ – State University of Rio de Janeiro Brazil Structural Engineering Department UERJ – State University of Rio de Janeiro Brazil Construction Engineering Research Group IIW Faculty Hasselt University Belgium

The connections play an important role in the overall behaviour of the structures. Therefore an adequate structural design taking into account both safe and economic criterion is necessary. The structural design of stainless steel bolted connections using actual codes can provide inadequate design capacity mainly due to the use of similar rules based on analogies from mild carbon structures. Thus, the purpose of this paper is to evaluate the structural response of stainless bolted connections considering the steel grade austenitic 304. Experimental and numerical analyses have been carried out considering bolted connection under bearing failure. In details, the study cases were subjected to two shear planes with thin-plate and thick-plate. In these cases, the occurrence of curling failures is possible. A detailed study involving the geometric parameters adopted by design equations of bolted stainless steel connections was made. The outcomes showed a reduction of the ultimate capacity characterised by out-plane deformation. In addition, the current codes led to significant difference when compared to both experimental and numerical results. © 2021 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

关键词： Structural design

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Index Risk of Sanitation (IRS) Modeling to Determine Domestic Waste Water System 1

Index Risk of Sanitation (IRS) Modeling to Determine Domesti...

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1st International Conference on Industrial Revolution 4.0 and Its Application in Science, Technology, engineering, Education, and Mathematics, ICSTEEM 2019 and 3rd Global Research on Sustainable Transport and Logistics, Grostlog 2019

作者： Rooslan Edy Santosa, Florianus Dwi Atmoko, Arief Arifin, Bustomi Narotama University Department of Civil Engineering Surabaya Jawa Timur60117 Indonesia Narotama University Department of Law Surabaya Jawa Timur60117 Indonesia Program Study of Law Faculty of Law Narotama University Narotama University Department of Education and Science Surabaya Jawa Timur60117 Indonesia

Indonesian government through National Medium Development Term Plan (2015-2019) aims 100% easy access of clean and fresh drink water, and 100% decent access of sanitation. The present study aims to determine index risk of sanitation modeling (IRS) of domestic waste water as an effort in achieving the target of Universal Access 2020. Discriminants that resulted from the present study are: Z1 = -41.86 - (1,16*IRS) + (0,07*PM) + (0,16*PP) + (0,11*PWM) dan Z2 = 6.74 + (1,54*IRS) + (0,01*PM) + (0,21*PP) - (0,26*PWM) in which it is used to determine domestic waste water system. Variables that influence this system are index risk of sanitation (IRS), female participant (PP), poor people (PWM), and beneficiary (PM). When the equation mentioned above is applied into 154 districts in Surabaya, the result will be as follow: 1) Based on Domestic Waste Water System there are 57 districts (37,01%) that can be included into communal system, 31 (20,13%) districts are included into domestic IPAL system and 66 districts (42,86%) are included into combination between communal and IPAL system. © Published under licence by IOP Publishing Ltd.

关键词： Pulse width modulation

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Design prototype of audio guidance system for blind by using raspberry pi and fuzzy logic controller 2

Design prototype of audio guidance system for blind by using...

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2nd International Conference on Mechanical, Electronics, Computer, and Industrial Technology, MECnIT 2018

作者： Ma'muriyah, Ni'matul Yulianto, Andik Lili Electrical Engineering Study Program Faculty of Industrial Technology Universitas Internasional Batam Indonesia

With almost 3.75 million people with visually impaired in Indonesia, according to statistical data shown that most of them not live in prosperity. To increase their productivity they need an assistive device that's allows them to navigate freely. This paper presents a novel Audio guidance system for blind in the shape of simple bag with earphone for giving them an audio guidance efficiently and safety. Different with other audio guidance, we propose a simple system consist of Raspberry Pi Camera and Ultrasonic Sensor as input, Raspberry Pi, Earphone and Power bank. This system is initiated by providing a voice command of the direction where the blind person must walk or go through, so they can avoid from obstacles. We also apply Fuzzy Logic Controller (FLC) to detect the obstacles along they walk by using 3 ultrasonic sensors. The experimental result shows that by using FLC and interfacing by Raspberry Pi the proposed system can effectively to detect the obstacles and give direction with 2.32% distance error. © 2019 Published under licence by IOP Publishing Ltd.

关键词： Fuzzy logic

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Detecting AI-Generated Text in Educational Content: Leveraging Machine Learning and Explainable AI for Academic Integrity

arXiv

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arXiv 2025年

作者： Najjar, Ayat A. Ashqar, Huthaifa I. Darwish, Omar A. Hammad, Eman Faculty of Modern Science Arab American University 13 Zababdeh P.O Box 240 Jenin Palestine Civil Engineering Department Arab American University 13 Zababdeh P.O Box 240 Jenin Palestine Artificial Intelligence Program Fu Foundation School of Engineering and Applied Science Columbia University 500 W 120th St New YorkNY10027 United States Information Security and Applied Computing Eastern Michigan University 900 Oakwood St YpsilantiMI48197 United States iSTAR Lab Engineering Technology & Industrial Distribution Texas A&M University 400 Bizzell St College StationTX77840 United States

This study seeks to enhance academic integrity by providing tools to detect AI-generated content in student work using advanced technologies. The findings promote transparency and accountability, helping educators maintain ethical standards and supporting the responsible integration of AI in education. A key contribution of this work is the generation of the CyberHumanAI dataset, which has 1000 observations, 500 of which are written by humans and the other 500 produced by ChatGPT. We evaluate various machine learning (ML) and deep learning (DL) algorithms on the CyberHumanAI dataset comparing human-written and AI-generated content from Large Language Models (LLMs) (i.e., ChatGPT). Results demonstrate that traditional ML algorithms, specifically XGBoost and Random Forest, achieve high performance (83% and 81% accuracies respectively). Results also show that classifying shorter content seems to be more challenging than classifying longer content. Further, using Explainable Artificial Intelligence (XAI) we identify discriminative features influencing the ML model's predictions, where human-written content tends to use a practical language (e.g., use and allow). Meanwhile AI-generated text is characterized by more abstract and formal terms (e.g., realm and employ). Finally, a comparative analysis with GPTZero show that our narrowly focused, simple, and fine-tuned model can outperform generalized systems like GPTZero. The proposed model achieved approximately 77.5% accuracy compared to GPTZero's 48.5% accuracy when tasked to classify Pure AI, Pure Human, and mixed class. GPTZero showed a tendency to classify challenging and small-content cases as either mixed or unrecognized while our proposed model showed a more balanced performance across the three classes. © 2025, CC BY.

关键词： Adversarial machine learning

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Backflow characteristics at Palu estuary as the impact of bed subsidence after the 2018 earthquake and Tsunami

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AIP Conference Proceedings 2023年第1期2643卷

作者： I. Gede Tunas Muh. Galib Ishak Rudi Herman Setiyawan Yassir Arafat 1Master of Civil Engineering Program Faculty of Engineering Universitas Tadulako Jalan Soekarno-Hatta Km. 9 Palu Central Sulawesi 94117 Indonesia

The Palu River in Central Sulawesi is one of the rivers prone to flooding in Indonesia, especially in the middle and downstream segments. The intensity of flooding has also increased after the 2018 Earthquake and Tsunami due to bed subsidence around Palu Bay triggered by the earthquake. This paper intends to investigate the impact of configuration changes and bed subsidence on flow characteristics, particularly the upstream return flow associated with high tide. Hydrodynamic simulations have been performed for tracing the water level profile upstream using the HEC-RAS Package. The simulation was applied for three conditions: minimum discharge, average discharge and maximum discharge, and it established high tide levels as a condition of the downstream boundary. The high tide level is defined as the simulation boundary because high tides generally cause inundation in the estuary due to backflow during both low and high flows. The simulation results based on the geometry of the river after the 2018 earthquake and tsunami show that the backflow to the upstream of the Palu River due to high tides has been seen in all three simulation conditions. High tide has triggered the longest return flow at minimum discharge reaching nearly 3 km upstream with varying heights along the water level profile. This backflow has the potential to cause bottom silting due to reduced flow velocity.

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Role of green building developer and owner in sustainability construction: Investigating the relationships between green building key success factors and incentives 3

Role of green building developer and owner in sustainability...

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3rd International Conference on Eco engineering Development, ICEED 2019

作者： Berawi, Mohammed Ali Basten, Van Latief, Yusuf Crévits, Igor Civil Engineering Department Faculty of Engineering Universitas Indonesia Kampus Baru UI Depok16424 Indonesia Program of Civil Engineering Study Institut Sains Dan Teknologi Pradita Scientia Business Park Tower i Tangerang Gading Serpong Indonesia Laboratoire d'Automatique de Mécanique et d'Informatique Industrielles et Humaines Université de Valenciennes et du Hainaut-Cambrésis Le Mont Houy Valenciennes Cedex 959313 France

Adaptation to the concept of sustainability is a problem in developing countries, especially in terms of the level of knowledge, economic capability, environmental conditions, and regional policies. These four aspects become exogenous variables in this study to examine the role of green building concepts in sustainable concepts in building construction. Qualitative and quantitative methods become a way to prove the hypothesis of this study by using SEM-PLS as an analysis tool. The sample in this study limits the building developers and owners to assess aspects that affect the sustainability of the green building concept and obtain an overview of the incentive models they expect. The results of this study indicate the level of knowledge of building developers and building owners affects the ability of building management to achieve a sustainable concept. Besides, the aspect of sustainability has an impact on the acquisition of both internal and external incentives for developers and building owners. Specific incentive models that developers and owners expect are accelerating licensing and building certification and reducing property tax. The government also supports the provision of property tax compared to value-added tax because it is a controlling tool in implementing green building concepts. © 2020 Published under licence by IOP Publishing Ltd.

关键词： Sustainable development

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Assessment and optimization of As(V) adsorption on hydrogel composite integrating chitosan-polyvinyl alcohol and Fe3O4 nanoparticles and evaluation of their regeneration and reusable capabilities in aqueous media

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Science of the Total Environment 2023年 855卷 158877页

作者： Weerasundara, Lakshika Ok, Yong Sik Kumarathilaka, Prasanna Marchuk, Alla Bundschuh, Jochen School of Civil Engineering and Surveying Faculty of Health Engineering and Sciences University of Southern Queensland West Street ToowoombaQLD4350 Australia Korea Biochar Research Centre & Division of Environmental Sciences and Ecological Engineering Korea University Seoul Korea Republic of Institute for Life Sciences and the Environment University of Southern Queensland West Street ToowoombaQLD4350 Australia Doctoral Program in Science Technology Environment and Mathematics Department of Earth and Environmental Sciences National Chung Cheng University 168 University Rd. Min-Hsiung Chiayi County62102 Taiwan

A modified chitosan-polyvinyl alcohol (PVA) hydrogel was developed by incorporating Fe3O4 nanoparticles. Four chitosan-Fe3O4 (ChFe) hydrogel types were developed based on chitosan:Fe3O4 ratio as 1:0, 1:1, 1:0.5 and 1:0.25. Batch sorption experiments were conducted with different pH, dosage, kinetics, and isotherms. The exhausted ChFe hydrogels were evaluated for their regeneration and reuse capability with different acids and bases. The best hydrogel for arsenic (V) [As(V)] adsorption was 1:0.5 ratio ChFe hydrogel. The highest As(V) adsorption (89 %) was at pH 4 and the adsorption capacity gradually decreased with increasing solution pH. Within the pH 4–6 range, the hydrogel surface became positively charged due to protonation of –NH2 and –OH groups in the polymer chain and the positive surface attracted H2AsO4− and HAsO42− oxyanions. The experimental kinetic data was well-fitted to the Elovich model (R2 of 0.99) while the Freundlich isotherm model best described the isotherm data (R2 of 0.97). The models predicted chemisorption mechanisms on ChFe hydrogel composites. Electrostatic attractions with –NH3+ and –OH2+, ligand-exchange inner-sphere complexes formation and bidentate corner-sharing (2C) and bidentate edge-sharing (2E) trimetric surface complexes formation have been proposed as the adsorption mechanism of As(V) into ChFe hydrogel. 0.1 M CH3COOH showed the best regeneration pattern with 75, 96, 81, 53 and 43 % of 1st, 2nd, 3rd, 4th and 5th adsorption respectively. Because of this re-usable capability, the As(V) adsorption capacity is not a single value from one adsorption cycle, but a cumulative value of several adsorption cycles and it was 17.39 mg/g for five adsorption cycles. Open for regeneration and reuse, no post-treatment is needed for adsorbent-water separation, allow applications of the ChFe hydrogel composite in a wide range of applications such as water filtration and purification systems. The modification with ChFe further expands the application

关键词： Nanoparticles

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Green building incentive model during design recognition to ensure the reliability of green building operation and maintenance achievement 3

Green building incentive model during design recognition to ...

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3rd International Conference on Eco engineering Development, ICEED 2019

作者： Berawi, Mohammed Ali Basten, Van Latief, Yusuf Crévits, Igor Civil Engineering Department Faculty of Engineering Universitas Indonesia Kampus Baru UI Depok16424 Indonesia Program of Civil Engineering Study Institut Sains Dan Teknologi Pradita Scientia Business Park Tower i Gading Serpong Tangerang Indonesia Laboratoire d'Automatique de Mécanique et d'Informatique Industrielles et Humaines Université de Valenciennes et du Hainaut-Cambrésis Le Mont Houy Valenciennes Cedex 959313 France

A low number in green building development cause the building construction will have an immense direct and indirect impact on future generations. This paper identified the optimum incentive model driving the building efficiency achievement in green building operation and maintenance. Critical factors that influence building consultant and contractor decision in green building design and construction toward the operation and maintenance achievement planned were analysed using partial least square structural equation modelling (PLS-SEM) methods. Precisely, the study modelled the regional policy affecting building efficiency achievement in the developing country. This research already identified the way of green building stakeholders' operations and maintenance in the capital city of Indonesia. Quantitative method using case study analysis already validated for the questionnaire data. The PLS-SEM indicated that sustainable in green building implementation and sustainability has significant causal effects on the regional policy of building the life cycle. Among these factors, tax exemption, expedited permit, and floor to area ratio were significant. The regional policy indicators in green building implementation have the most significant effect on building efficiency achievement. © 2020 Published under licence by IOP Publishing Ltd.

关键词： Developing countries

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Comparison of Wind Load on Standard Steel Truss Bridge Based on Indonesian Bridge Loading Codes

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IOP Conference Series: Earth and Environmental Science 2022年第1期998卷

作者： M. Suangga Sularno Civil Engineering Department Faculty of Engineering Bina Nusantara University Jakarta Indonesia 11480 Master Program in Civil Engineering Tarumanagara University Jakarta Indonesia 11480

The truss bridge is a type of bridge that is widely used in Indonesia because of its practicality and can be constructed in short period of time. The relatively light weight of the truss bridge structure also facilitates the transportation of superstructure materials to bridge locations located in remote areas. The dimensions of the large truss bridge and the relatively light weight cause the figure bridge to be vulnerable to wind loads. Meanwhile, the bridge loading regulations including wind load is continuing to change. Previous design code BMS 1992 and SNI T 02 2005 has been superseded with SNI 1725 2016. One of the main changes to the loading regulations is related to the magnitude and how wind loads are calculated and applied to the bridge structure. This study will compare the magnitude of the wind load in the previous loading regulations in Indonesia with the latest regulations and also with wind loading according to AASHTO on steel truss bridges. A 60-class standard steel truss bridge from the Ministry of Public Works which is used for Case study. The results showed that there was a significant increase in wind loading by applying SNI 1725 2016 loading regulations

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Calibration of 100 A/50mA instrument current transformer energy meter using bisection method 2

Calibration of 100 A/50mA instrument current transformer ene...

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2nd IEEE International Conference on Innovative Research and Development, ICIRD 2019

作者： Bimantoro, Renardi Ardiya Rahardjo, Amien Husnayain, Faiz Aryani, Dwi Riana Hudayala, Chairul Universitas Indonesia Department of Electrical Engineering Faculty of Engineering Depok16424 Indonesia Energy System Engineering Master Study Program Faculty of Engineering Universitas Indonesia Depok16424 Indonesia

ISBN: (纸本)9781728128252

Instrument current transformers (CTs) are widely used in various types of electrical energy measurement. Eddy current losses, losses of hysteresis, a saturation of CT, and inevitable flux leaks could lead to errors including errors in the ratio and phase angle. Improving the accuracy of CT measurement could be achieved in many ways. In this study, a bisection calibration method to overcome the error by implementing correction factor integrated with the Arduino codes is investigated. The reliability of this system has been tested in two different situations, which are a constant and variable load experiments. The result shows that the readout of the developed instrument using 100 A/50mA CT could achieve the deviation value of less than 2%, confirming the excellence accuracy of energy meter. © 2019 IEEE.

关键词： Electric instrument transformers

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