Infrastructure Engineering - Research Publications

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    Life-cycle performance of aluminium cladding panels in resisting hailstorms
    Shi, S ; Lam, N ; Cui, Y ; Lu, G ; Gad, E ; Zhang, L (Elsevier, 2024-05)
    This paper delves into cumulative damage on aluminium cladding panels attributed to hailstorms throughout the lifespan of the installations. 40 gas gun tests subjecting the cladding panel to repeated impact were undertaken for the purpose of studying cumulative damage behaviour. Insights from these tests were integrated into a hail size distribution model to characterise the probabilistic distribution of permanent indentation resulted from multiple hailstorm events. A life-cycle analysis framework was subsequently introduced, incorporating the natural variability of hailstone sizes and dynamic response of claddings to repeated ice impact. Intervention criterion can be established based on knowledge of the accumulation of permanent indentation into the cladding panels. Proactive actions are recommended should the indentations become visible to prevent worsening damage. Randomness of hailstorm occurrences was considered using hazard function which can be inferred from historical observations. Practical application of the proposed model is illustrated through case studies of two Australian states, coupled with comparative analyses highlighting key factors influencing cladding performance. The ability to account for stochasticity distinguishes the presented framework from existing deterministic approaches.
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    How to improve the effects of knowledge governance on individual learning across projects: From the perspective of relational capital
    Zhang, X ; Shen, W ; Tang, W ; Duffield, CF ; Hui, FKP ; Zhang, L ; Lou, C (Elsevier BV, 2024-01)
    Supportive knowledge management and good relationships are both important aspects for enhancing individual learning across projects, however little research has presented a systematic theory on the cause-effect relationships between the above themes. With support of data collected from the industry survey, this study has established and validated a conceptual model that maps individual learning outcomes on knowledge governance, learning intention and relational capital from a holistic view. The results reveal that a supportive knowledge governance system could significantly promote individual learning across projects, and this effect is mainly achieved by inspiring individuals’ learning intention. This study also demonstrates that the relational capital can enhance the relationship between knowledge governance and individual's learning intention. The outcomes advance the theory of knowledge management by presenting the conceptual model that helps answer the question: "How can knowledge governance and relational capital improve individual learning across projects?" The results can also guide participants to have superior project performance with assistance of experience and knowledge from different projects in practice.
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    Running the Codification Gauntlet: Why Intent Alone Cannot Afford the Codification of Project Learnings
    Ferres, GM ; Moehler, R (SAGE Publications, 2024-02-01)
    This article presents a first synthesis of the ability to codify challenges that constrain project learning codification and, in turn, limit the sharing of learnings between projects at scale. An improved understanding of these challenges supports the externalized sharing of project learnings, between communities of practice, that can scale beyond the temporal, geographical, and organizational barriers that constrain personalized sharing. Through an integrative cross-domain literature review, a learning codification gauntlet of seven key ability to codify challenges is reconceptualized, and significant new research gaps are identified for further investigation, including: the operation of identified challenges in practice, challenge interrelationships, and challenge-cumulative effects on project-to-project learning outcomes.
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    Effects of mat composition and pressing time on citric acid-bonded ultra-low-density hemp hurd particleboard
    Fehrmann, J ; Belleville, B ; Ozarska, B ; Ismayati, M ; Dwianto, W (Elsevier, 2024-04-01)
    This study investigated the feasibility of using citric acid (CA) as a biobased and formaldehyde-free binder for producing ultra-low-density (320 to 338 kg/m3) hemp hurd particleboard (ULHPB). Mechanically decorticated hemp hurd chips were milled and then separated into fine (F), medium (M), and coarse (C) particle sizes. Three particle size mixes (PSM) were used to fabricate the panels: 100% C, 100% M, and a 50/50% mixture of CM. Each PSM was combined with low and high CA contents (20 and 30 wt%) and subjected to short and long pressing times (8 and 12 min) at 200 °C. Physico-mechanical characteristics were evaluated following Australian standard AS/NZS 1859.1 (2017) for reconstituted wood-based panels. Thermo-chemical analyses were performed to understand the properties of the raw hurd and to investigate the binding mechanisms in CA-ULHPB. The PSM had a significant impact on panel expansion (springback), internal bond strength (IB), water absorption (WA), and thickness swelling (TS) in most CA-ULHPB variants. PSM-C panels exhibited superior IB when pressed with 30 wt% CA for 12 min. The effect of PSMs diminished for WA and TS but CA content and pressing time remained highly significant. Py-GC/MS, FTIR spectroscopy and TGA indicated the formation of ester linkages with carbohydrate-derived OH-groups and the involvement of lignin moieties in the CA-ULHPB. This research identified optimal panel compositions and processing parameters for fabricating environmentally friendly composite panels using CA as a natural adhesive and hemp hurd as an agricultural by-product. The panels exhibited excellent properties and would be well suited as core layers in lightweight sandwich composites given their ultra-low-density range.
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    Introducing HyPeak: An international network on hydropeaking research, practice, and policy
    Alp, M ; Batalla, RJ ; Dolores Bejarano, M ; Boavida, I ; Capra, H ; Carolli, M ; Casas-Mulet, R ; Costa, MJ ; Halleraker, JH ; Hauer, C ; Hayes, DS ; Harby, A ; Noack, M ; Palau, A ; Schneider, M ; Schonfelder, L ; Tonolla, D ; Vanzo, D ; Venus, T ; Vericat, D ; Zolezzi, G ; Bruno, MC (WILEY, 2023-03)
    Abstract An increase in the demand for renewable energy is driving hydropower development and its integration with variable renewable energy sources. When hydropower is produced flexibly from hydropower plants, it causes rapid and frequent artificial flow fluctuations in rivers, a phenomenon known as hydropeaking. Hydropeaking and associated hydrological alterations cause multiple impacts on riverine habitats with cascading effects on ecosystem functioning and structure. Given the significance of its ecological and socio‐economic implications, mitigation of hydropeaking requires an inter‐ and transdisciplinary approach. An interdisciplinary network called HyPeak has been conceived to enrich international research initiatives and support hydropower planning and policy. HyPeak has been founded based on exchange and networking activities linking scientists from several countries where hydropeaking has been widespread for decades and numerous studies dedicated to the topic have been carried out. HyPeak aims to integrate members from other countries and continents in which hydropower production plays a relevant role, and grow to be a reference group that provides expert advice on the topic to policy‐makers, as well as researchers, stakeholders, and practitioners in the field of hydropeaking.
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    A macro-element model for predicting the combined load behaviour of spudcan foundations in clay overlying sand
    Wang, Y ; Cassidy, MJ ; Bienen, B (Thomas Telford Ltd., 2021-10-26)
    A macro-element model for predicting the load–displacement behaviour of a spudcan foundation in clay overlying sand when subjected to combined vertical, horizontal and moment loading is introduced. Observations from detailed drum centrifuge tests that measured the effect of the underlying sand layer on the foundation behaviour are combined with finite-element results and theoretical developments to derive the components of the model. The yield surface defined by the centrifuge test results suggests that as the spudcan nears the underlying sand layer, the absolute horizontal capacity remains relatively constant, while the vertical and moment capacities increase at approximately the same normalised rate. The model is demonstrated to accurately predict foundation behaviour by retrospectively simulating the experimental results. This macro-element model has the advantage that it can be integrated into the structural analyses of jack-up platforms required for site-specific assessments.
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    Probabilistic failure envelopes of strip foundations on soils with non-stationary characteristics of undrained shear strength
    Shen, Z ; Pan, Q ; Chian, SC ; Gourvenec, S ; Tian, Y (ICE Publishing, 2023-08-01)
    This paper investigates probabilistic failure envelopes of strip foundations on spatially variable soils with profiles of undrained shear strength, su, linearly increasing with depth using lower-bound random finite-element limit analysis. The spatially variable su is characterised by a non-stationary random field with linearly increasing mean and constant coefficient of variation (COV) with depth. The deterministic uniaxial capacities and failure envelopes are first derived to validate the numerical models and provide a reference for the subsequent probabilistic analysis. Results indicate that the random field parameters COVsu (the COV of su) and Δ(dimensionless autocorrelation distance) have a considerable effect on the probabilistic normalised uniaxial capacities, which alters the size of the probabilistic failure envelopes. However, an insignificant effect of COVsu and Δon the shape of probabilistic failure envelopes is observed in the V-H, V-M and H-M loading spaces, such that failure envelopes for different soil variabilities can be simply scaled by the uniaxial capacities. In contrast to COVsu and Δ, the soil strength heterogeneity index κ = μkB/μsu0 has the lowest effect on the probabilistic normalised uniaxial capacity factors, but the highest effect on the shape of the probabilistic failure envelopes. A series of expressions is proposed to describe the shape of deterministic and probabilistic failure envelopes for strip foundations under combined vertical, horizontal and moment (V-H-M) loading.
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    Excavator 3D pose estimation using deep learning and hybrid datasets
    Assadzadeh, A ; Arashpour, M ; Li, H ; Hosseini, R ; Elghaish, F ; Baduge, S (ELSEVIER SCI LTD, 2023-01)
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    The significance of octane numbers to hybrid electric vehicles with turbocharged direct injection engines
    Zhou, Z ; Yang, Y ; Brear, M ; Kar, T ; Leone, T ; Anderson, J ; Shelby, M ; Lacey, J (ELSEVIER SCI LTD, 2023-02-15)
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    Integrating asset-specific flood vulnerability assessments with value-based preservation processes to develop the Heritage Building Flood Robustness Toolkit
    Snelling, R ; Rismanchi, B ; Holzer, D (ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER, 2024-03-01)