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The effect of feedback on settling basin’s trap efficiency

ISH Journal of Hydraulic engineering 2025年第2期31卷 277-291页

作者： Kurniawan, Vittorio Civil Engineering Undergraduate Program Universitas Tarumanagara West Jakarta Indonesia

Settling basin is widely used and has been researched for a long time, yet the relationship between its trap efficiency and morphology is scarcely studied. This paper probes the effect of the morphology-hydrodynamics feedback on a settling basin’s performance using one-dimensional numerical modelling. The feedback took place when the sedimentation raised the bottom level, and it subsequently accelerated the flow velocity. The increased velocity hindered the sediments from settling thus the trap efficiency declined as the sediments filled in the settling basin. Eventually, the bed level stopped increasing when the critical shear stress was reached because the flow kept entraining the bottom particles. The equilibrium was achieved when the bottom level and the flow velocity stopped increasing. In this state, the trap efficiency fell to zero hence the settling basin was incapable of depositing sediments anymore. The feedback did not only relate the bottom level with the shear stress but with the propagation time also. The increased flow velocity transported the sediments faster thus the particles did not have time to settle. © 2025 Indian Society for Hydraulics.

关键词： Shear stress

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An integrated decision-making approach to resilience–LCC Bridge network retrofitting using a genetic algorithm-based framework

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Resilient Cities and Structures 2025年第1期4卷 16-40页

作者： Omidian, Pedram Khaji, Naser Aghakouchak, Ali Akbar Faculty of Civil and Environmental Engineering Tarbiat Modares University Tehran P.O. Box 14115-397 Iran Civil and Environmental Engineering Program of Advanced Science and Engineering Hiroshima University 1-4-1 Kagamiyama Higashi-Hiroshima Hiroshima739-8527 Japan

Bridge networks are essential components of civil infrastructure, supporting communities by delivering vital services and facilitating economic activities. However, bridges are vulnerable to natural disasters, particularly earthquakes. To develop an effective disaster management strategy, it is critical to identify reliable, robust, and efficient indicators. In this regard, Life-Cycle Cost (LCC) and Resilience (R) serve as key indicators to assist decision-makers in selecting the most effective disaster risk reduction plans. This study proposes an innovative LCC–R optimization framework to identify the most optimal retrofit strategies for bridge networks facing hazardous events during their lifespan. The proposed framework employs both single- and multi-objective optimization techniques to identify retrofit strategies that maximize the R index while minimizing the LCC for the under-study bridge networks. The considered retrofit strategies include various options such as different materials (steel, CFRP, and GFRP), thicknesses, arrangements, and timing of retrofitting actions. The first step in the proposed framework involves constructing fragility curves by performing a series of nonlinear time-history incremental dynamic analyses for each case. In the subsequent step, the seismic resilience surfaces are calculated using the obtained fragility curves and assuming a recovery function. Next, the LCC is evaluated according to the proposed formulation for multiple seismic occurrences, which incorporates the effects of complete and incomplete repair actions resulting from previous multiple seismic events. For optimization purposes, the Non-Dominated Sorting Genetic Algorithm II (NSGA-II) evolutionary algorithm efficiently identifies the Pareto front to represent the optimal set of solutions. The study presents the most effective retrofit strategies for an illustrative bridge network, providing a comprehensive discussion and insights into the resulting tactical approaches

关键词： Genetic algorithms

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The influence of plastic waste on the properties of lime-based mortars

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Frontiers of Structural and civil engineering 2025年第3期19卷 477-487页

作者： Vasiliki PACHTA Angeliki-Christina VEDINOGLOU Sofia FLEVARAKI Laboratory of Building Materials School of Civil EngineeringAristotle University of ThessalonikiThessaloniki 54124Greece Interdepartmental Program of Postgraduate Studies‘Protection Conservation and Restoration of Cultural Monuments’ Aristotle University of ThessalonikiThessaloniki 54124Greece

The increasing consumption of plastics, and the threat of environmental impact of their disposal, renders the management of their waste of interest. In the present study, an effort has been made to investigate the influence of waste polyvinyl chloride (PVC) and polypropylene (PP) of various origin in lime-based mortars, applied in the restoration of traditional structures. Nine mortar compositions (based on lime and natural pozzolan) were designed, manufactured and tested, in which natural aggregates were partially substituted by waste plastics (in proportions of 12.5% and 25% v/v of aggregates). According to the research results, shrinkage deformations were reduced in the short term in all modified compositions, porosity showed slight changes, while apparent specific gravity and capillary absorption index were decreased. Mechanical properties were enhanced in the case of the PVC and the lower PP flakes addition (12.5% v/v), while compressive strength was reduced around 5%–25% in the higher proportion (25% v/v). Generally, it could be asserted that the 12.5% v/v proportion of waste plastics offered benefit, and in particular PVC addition was beneficial in terms of physico-mechanical properties, rendering the exploitation of plastic waste in lime-based systems feasible.

关键词： plastic waste lime mortars pozzolan polypropylene polyvinyl chloride

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Experimental Investigation for a Novel Bio-Inspired Scour Countermeasure

Experimental Investigation for a Novel Bio-Inspired Scour Co...

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Geotechnical Frontiers 2025: Geotechnics of Natural Hazards

作者： Castillo, Rodolfo Kulesza, Stacey Rhode-Barbarigos, Landolf Civil Engineering Program Texas State Univ. San MarcosTX United States Dept. of Civil Architectural and Environmental Engineering Univ. of Miami MiamiFL United States

ISBN: (数字)9780784485996

Bridge scour poses a persistent threat to infrastructure durability, necessitating the development of novel, eco-friendly solutions to complement traditional protection methods. One potential solution developed at the University of Miami is SEAHIVE, a system of hexagonal hollow concrete prisms with perforations on each face. SEAHIVE elements have been used as a sustainable estuarine and marine revetment to mitigate wave energy along seawalls emulating beehives. SEAHIVE elements also provide habitat for displaced ecosystems, such as hybrid coral reefs and mangrove tree planters. In this study, we describe the experimental setup and results to evaluate the ability of SEAHIVE elements in reducing local scour at bridge piers. Specifically, this study evaluated the local scour development around three configurations of a SEAHIVE monopile compared to a circular monopile through scaled physical testing in the Texas State University flume. By quantifying the equilibrium scour depth and the volume of the scour hole around SEAHIVE monopiles, the research contributes valuable insights into the use of SEAHIVE for scouring protection and the ability of novel sustainable and eco-friendly solutions in enhancing infrastructure durability. © ASCE.

关键词： Bridge piers

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Identification of Green Construction Indicators and Project Performance in Green Construction Based Project Management Using the Delphi Method 8th

Identification of Green Construction Indicators and Project ...

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8th International Conference on civil engineering, ICOCE 2024

作者： Istri Mas Pertiwi, I.G.A. Zaika, Yulvi Negara, Kartika Puspa Solimun Agung Wibowo, M. Brawijaya University Malang Indonesia Doctoral Program of Civil Engineering Brawijaya University Malang Indonesia Department of Civil Engineering Brawijaya University Malang Indonesia Department of Statistic Brawijaya University Malang Indonesia Diponegoro University Semarang Indonesia Departemen of Civil Engineering Diponegoro University Semarang Indonesia

ISBN: (纸本)9789819759095

A green-oriented project management system will be different from projects in general. Differences occur in the planning process to the construction process. To support sustainable and environmentally friendly development, it is very necessary to implement green buildings. For this reason, the Indonesian government, through the Public Works and Public Housing (PUPR) Ministry, has standards regarding green buildings in the form of indicators of green construction variables as requirements for green building certification. Green construction practices also influence performance achievements, such as cost, schedule, quality, environmental, and occupational health and safety (OHS) performance, hereinafter referred to as project performance variables. The aim of the research is to identify green construction indicators that will be applied and project performance indicators that will be used to assess project performance in green construction based project management. There are 17 indicators from the results of previous research synthesis. Meanwhile, the project performance variables obtained were nine cost performance items, five schedule performance items, six quality performance items, and eight OHS performance items. Analysis using the Delphi method, the first round was carried out to identify indicators for each variable that were ranked in the high category. The second round was to obtain consensus from all respondents. The Delphi survey was conducted using Google Form on 20 respondents representing all stakeholders in the construction services industry and project owners with a five-point Likert scale. The analysis resulted in 17 indicators identified in the initial survey being highly rated for application to green projects. Meanwhile, for project performance, the results obtained were nine cost performance items, four schedule performance items, six quality performance items, and seven K3 performance items identified in the initial survey which received high rat

关键词： Green buildings

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Leveraging AI to Enhance XR in the AEC Industry

Leveraging AI to Enhance XR in the AEC Industry

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International Conference of Sustainable Development and Smart Built Environments, SDSBE 2024

作者： Alizadehsalehi, Sepehr Hadavi, Ahmad Project Management Program Northwestern University EvanstonIL United States Department of Civil and Environmental Engineering Northwestern University EvanstonIL United States

ISBN: (纸本)9789819640508

The Architecture, engineering, and Construction (AEC) industry will benefit significantly from integrating Artificial Intelligence (AI) and Extended Reality (XR) technologies. This paper explores the immense potential of AI-enhanced XR in tackling the industry challenges. While AI and XR are currently employed independently, this paper proposes a framework for their integration, aiming to optimize resource allocation, elevate safety protocols, and enhance project accuracy. Supported by a SWOT analysis, the study presents practical implications and proposed use cases showcasing the application of AI and XR in AEC projects. The paper provides a strategic roadmap for integrating AI-driven XR, emphasizing its potential to drive immediate and sustainable advancements in construction practices and set new industry benchmarks for innovation and efficiency. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Project management

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Diagnosis of pathological manifestations in popular housing of COHAB in Caruaru, Pernambuco: a forensic approach

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Journal of Building Pathology and Rehabilitation 2025年第1期10卷 1-17页

作者： Lima Júnior, Humberto Correia da Silva Medeiros, Iálysson Barbosa, Felipe Augusto Almeida de Lima, Douglas Mateus Graduate Program in Civil and Environmental Engineering Technology Center Academic Center of Agreste Federal University of Pernambuco Marielle Franco Avenue Nova Caruaru Pernambuco Caruaru 55014-900 Brazil

The construction of Social Interest Housing through housing programs is a crucial government investment aimed at reducing housing deficits and ensuring housing rights for low-income populations. However, despite driving the growth of the construction industry, historically these constructions have faced pathological manifestations. The term "pathology" in this context refers to defects, non-conformities, and failures in constructions. Thus, this study is aimed at examining the pathological manifestations in social interest housing provided by the Popular Housing Company (COHAB-PE), focusing on popular residences built with subsidies targeted at housing programs in Caruaru, in the rural area of Pernambuco. The study, classified as exploratory and documentary following technical procedures, aims to analyze and identify recurring patterns of structural problems in popular housing. This was carried out through the analysis of 36 residences located in Caruaru, all of residential nature. The results underscore the need to investigate such issues, highlighting anomalies mostly related to construction errors, such as the lack of appropriate structural elements and waterproofing in foundations. The proposed technical solutions aim to ensure residents' safety. The lack of compliance with standards and the recurrence of the same problems over time and across different construction companies indicate a systemic failure in construction methods. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2025.

关键词： Construction flaws Expert reports Social interest housing Structural anomalies Technical solutions

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Numerical Modeling of C45 Steel to Predict the Temperature Ranges for Activation of Dynamic Strain Aging at Different Strain Rates 8th

Numerical Modeling of C45 Steel to Predict the Temperature R...

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8th International Conference on Manufacturing, Material and Metallurgical engineering, ICMMME 2024

作者： Hassan, Arhum Abed, Farid Materials Science and Engineering Program College of Arts and Sciences American University of Sharjah Sharjah26666 United Arab Emirates Department of Civil Engineering American University of Sharjah Sharjah26666 United Arab Emirates

ISBN: (纸本)9783031782947

This work predicts the temperature ranges for dynamic strain aging (DSA) activation in C45 steel at various strain rates through constitutive modeling and finite element (FE) simulations. DSA is often defined by a sudden increase in a metal’s strength when subjected to specific combinations of strain rates and temperatures due to the interaction of the diffused solute atoms with dislocations, and there is currently no effective constitutive model in the literature that can explain DSA physically. The current study offers a modification to the Voyiadjis–Abed (VA) model, which is used to predict DSA activation in C45 steel, in order to address this limitation. The modified constitutive model considers the diffusion kinetics and concentration of solute atom along the dislocation cores. The developed model was able to capture the activation of DSA in C45 steel at strain rates of 0.0015/s-0.15/s and temperature ranges of 500 K-750 K, which was found to be caused by carbon solute atoms. Additionally, FE simulations were carried out in ABAQUS through subroutine coded as VUMAT to validate the modified VA model’s prediction abilities. The results obtained compare effectively with the available experimental data. By integrating physical and microstructural features, the modified constitutive VA model can effectively capture the increase in flow stress due to the activation of DSA. This enables further investigation and progress in understanding the behavior of metals under specified temperature and strain rate conditions. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2025.

关键词： Digital elevation model

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Navigating Legal Frameworks for National Resilience: A Comparative Analysis of Key Disaster Management Laws in Thailand and Japan 4

Navigating Legal Frameworks for National Resilience: A Compa...

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4th International Symposium on Instrumentation, Control, Artificial Intelligence, and Robotics, ICA-SYMP 2025

作者： Laosunthara, Ampan Thongthip, Ratchaneekorn Krutphong, Kodchakorn School of Environment and Society Institute of Science Tokyo Tokyo Japan Disaster Preparedness Mitigation and Management Department of Civil & Infrastructure Engineering Pathumthani Thailand Environmental Engineering and Disaster Management Program Mahidol University Kanchanaburi Thailand

ISBN: (纸本)9798331505400

This study compares the disaster management laws of Thailand and Japan. The research reveals significant differences in legislative approaches, reflecting each country's unique historical, and governance contexts. Japan's law demonstrates a more comprehensive approach to the disaster management cycle and stakeholder involvement, with integrated financial provisions. Thailand's law emphasizes organizational aspects. Both prioritize response measures but show potential gaps in addressing preparedness and mitigation phases. The study identifies areas for further investigation, including financial measures, and international cooperation approaches. This comparative analysis offers valuable insights into both countries' ongoing development of disaster management systems and highlights potential areas for mutual learning and improvement in disaster risk reduction strategies. Creating resilience in the society through the core of the government working and stakeholders' given authorities. © 2025 IEEE.

关键词： Disaster prevention

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Performance Evaluation of Unpaved Roads Stabilized with Composite Geosynthetic Made of Recycled Plastic Geogrid and Nonwoven Geotextile

Performance Evaluation of Unpaved Roads Stabilized with Comp...

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Geotechnical Frontiers 2025: Foundations, Retaining Structures, and Geosynthetics

作者： Hasheminezhad, Araz Ceylan, Halil Kim, Sunghwan Tutumluer, Erol Dept. of Civil Construction and Environmental Engineering Program for Sustainable Pavement Engineering and Research Iowa State Univ. AmesIA United States Institute for Transportation Iowa State Univ. AmesIA United States Dept. of Civil and Environmental Engineering Univ. of Illinois at Urbana-Champaign UrbanaIL United States

ISBN: (数字)9780784485972

This paper presents recent findings from an ongoing research study to evaluate the effectiveness of a geosynthetic made from recycled plastic for stabilizing unpaved roads. In the state of Iowa, USA, two full-scale test sections were constructed: one stabilized with a newly developed composite geosynthetic, and the other serving as a control. This innovative geocomposite combines a geogrid made from recycled plastic and a nonwoven geotextile. Following construction, these unpaved test sections were exposed to real traffic loads that included trucks and implements of husbandry (farm equipment). The performance of reinforced unpaved roads was assessed using Lightweight Deflectometer (LWD) tests and field California Bearing Ratio (CBR) data collected using a clegg impact soil tester (CIST). The results indicated that unpaved roads stabilized with the geocomposite significantly reduced permanent deformation during the evaluation period. These findings suggest good potential of the geocomposite for enhancing unpaved road performance, pending further validation through continuous monitoring and evaluation of the test sections over longer periods. © ASCE.

关键词： Soil testing

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