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Modeling interfacial failure in 3D-printed concrete via peridynamics

International Journal of Mechanical Sciences 2025年

作者： Yuhang Duan Chuan Wang Binbin Yin K.M. Liew Department of Architecture and Civil Engineering City University of Hong Kong Kowloon Hong Kong China School of Mechatronic Engineering Southwest Petroleum University Chengdu Sichuan 610500 China Department of Civil and Environmental Engineering The Hong Kong Polytechnic University Hong Kong China Centre for Nature-Inspired Engineering City University of Hong Kong Kowloon Hong Kong China

Given its superior merits, 3D-printed concrete (3DPC) has transformative implications for the development of digital and green buildings. However, the poor interfacial properties of 3DPC may hinder the widespread adoption of 3DPC, as the construction industry is inherently risk-averse. To address this challenge, we propose a robust peridynamics model to predict interlayer bond strength and realistic crack propagation paths accurately. Assuming that the pore structure in the interfacial region is the primary factor affecting interfacial adhesion, a novel interfacial-controlled peridynamics model is developed using poroelasticity. By introducing a straightforward relation between interface and matrix fracture energy, our numerical model gains another significant advantage: its simplicity, as only one coefficient needs to be calibrated. The effectiveness and reliability of the proposed framework are validated through several numerical examples. Furthermore, as a first attempt, we investigate the interfacial failure of 3DPC, considering the filament heterogeneity under complex loading patterns. The competition between crack penetration and kinking modes of 3DPC is investigated. The results show that such competition significantly influences the final damage distribution, thereby offering valuable guidance for early prevention strategies. The present work provides deeper insights into the interfacial fracture behavior of 3DPC and lays the theoretical groundwork for its practical and large-scale implementation.

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Experimental methodology for measuring the structural dynamic transmission damping of a cultural heritage tower

Experimental methodology for measuring the structural dynami...

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IMEKO International Conference on Metrology for Archaeology and Cultural Heritage, MetroArchaeo 2017

作者： Diaferio, Mariella Foti, Dora Giannoccaro, Nicola Ivan Ivorra, Salvador Polytechnic of Bari Department of Civil Engineering and Architecture Bari Italy University of Salento Department of Innovation Engineering Lecce Italy University of Alicante Department of Civil Engineering Alicante Spain

ISBN: (纸本)9781510858183

This paper presents the dynamic experimental campaign carried out on simple model related to a stocky masonry clock tower situated in the Swabian Castle of Trani (Italy). The main objective of this paper is, after estimating the main frequencies and vibration modes of the considered structure, defining the influence on the structural damping dynamic transmission of the frequency of excitement. At this aim, firstly, an accelerations' record has been acquired simultaneously in 23 points of the tower at different levels, both due to environmental vibrations and to a series of sinusoidal forced vibrations applied at the base by using a pneumatic shaker device specify designed for the tests. © (2017) by the International Measurement Confederation (IMEKO). All rights reserved.

关键词： Structural dynamics

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Pedestrian-level wind and gust around buildings with a ‘lift-up' design:Assessment of influence from surrounding buildings by adopting LES

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建筑模拟（英文版） 2019年第6期12卷 1107-1118页

作者： Jianlin Liu Xuelin Zhang Jianlei Niu K.T.Tse School of Architecture Design and PlanningThe University of SydneySydneyAustralia Department of Civil and Environmental Engineering The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina School of Architecture Design and PlanningThe University of SydneySydneyAustralia Department of Building Services Engineering The Hong Kong Polytechnic UniversityHung HomHong KongChina

An architectural feature,'lift-up'(or elevated)design,has been reported as an effective design to improve weak pedestrian-level wind(PLW)conditions in a subtropical high-density *** design provides a semi-outdoor space under the elevated building which allows wind to penetrate through,but the influence of surrounding buildings on its performance has been rarely *** study aims to assess the influence of surrounding buildings on the PLW around an elevated ***(large eddy simulation)approach is applied after validation against the previous wind tunnel *** studies have confirmed and proven the accuracy of LES for the simulations,with the correlation coefficients R above 0.89 between the predictions and the ***,the differences of flow fields are assessed around a single elevated building and a building array with an open space,a building and an elevated building respectively in the *** indicate that wind amplification exists within the semi-outdoor space under the elevated building in all conditions although this effect is partially lowered by the surrounding *** fields of turbulence intensity and gust wind speed around the surrounded elevated building are investigated by *** findings can be helpful for using the 'lift-up' design to improve wind and thermal comfort at pedestrian level.

关键词： urban microclimate pedestrian-level wind LES (large eddy simulation),'lift-up' design surrounding buildings

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Fractional damping effects on the transient dynamics of the Duffing oscillator

arXiv

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arXiv 2022年

作者： Coccolo, Mattia Seoane, Jesús M. Lenci, Stefano Sanjuán, Miguel A.F. Nonlinear Dynamics Chaos and Complex Systems Group Departamento de Física Universidad Rey Juan Carlos Tulipán s/n Móstoles Madrid28933 Spain Department of Civil and Building Engineering and Architecture Polytechnic University of Marche Ancona60131 Italy Department of Applied Informatics Kaunas University of Technology Studentu 50-415 KaunasLT-51368 Lithuania

We consider the nonlinear Duffing oscillator in presence of fractional damping which is characteristic in different physical situations. The system is studied with a smaller and larger damping parameter value, that we call the underdamped and overdamped regimes. In both we have studied the relation between the fractional parameter, the amplitude of the oscillations and the times to reach the asymptotic behavior, called asymptotic times. In the overdamped regime, the study shows that, also here, there are oscillations for fractional order derivatives and their amplitudes and asymptotic times can suddenly change for small variations of the fractional parameter. In addition, in this latter regime, a resonant-like behavior can take place for suitable values of the parameters of the system. These results are corroborated by calculating the corresponding Q−factor. We expect that these results can be useful for a better understanding of fractional dynamics and its possible applications as in modeling different kind of materials that normally need complicated damping terms. Copyright © 2022, The Authors. All rights reserved.

关键词： Damping

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Explicit geometric construction of sparse inverse mass matrices for arbitrary tetrahedral grids

arXiv

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arXiv 2020年

作者： Pitassia, Silvano Trevisan, Francesco Specogna, Ruben University of Udine Polytechnic Department of Engineering and Architecture EMCLab via delle scienze 206 Udine33100 Italy

The geometric reinterpretation of the Finite Element Method (FEM) shows that Raviart–Thomas and Nédélec mass matrices map from degrees of freedoms (DoFs) attached to geometric elements of a tetrahedral grid to DoFs attached to the barycentric dual grid. The algebraic inverses of the mass matrices map DoFs attached to the barycentric dual grid back to DoFs attached to the corresponding primal tetrahedral grid, but they are of limited practical use since they are dense. In this paper we present a new geometric construction of sparse inverse mass matrices for arbitrary tetrahedral grids and possibly inhomogeneous and anisotropic materials, debunking the conventional wisdom that the barycentric dual grid prohibits a sparse representation for inverse mass matrices. In particular, we provide a unified framework for the construction of both edge and face mass matrices and their sparse inverses. Such a unifying principle relies on novel geometric reconstruction formulas, from which, according to a well-established design strategy, local mass matrices are constructed as the sum of a consistent and a stabilization term. A major difference with the approaches proposed so far is that the consistent term is defined geometrically and explicitly, that is, without the necessity of computing the inverses of local matrices. This provides a sensible speedup and an easier implementation. We use these new sparse inverse mass matrices to discretize a three-dimensional Poisson problem, providing the comparison between the results obtained by various formulations on a benchmark problem with analytical solution. © 2020, CC BY.

关键词： Inverse problems

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CFD simulation of anti-fogging coatings performance in refrigerated display cabinets

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Journal of Physics: Conference Series 2021年第1期1868卷 012002-012002页

作者： P D'Agaro G Croce N Suzzi Polytechnic Department of Engineering and Architecture University of Udine Italy

A numerical procedure for the simulation of both fogging and the defogging process on the glass door of a vertical refrigeration display cabinet for chilled food is presented. The large scale problem within the cabinet (convective air flow and heat transfer, moisture mass transport, unsteady conduction through a multi-glazed door) is modelled via a commercial CFD code, whereas the water layer is modelled, via in-house user defined routines, as a collection of tiny droplets in order to take into account the surface wetting properties, the latent heat contributions and the area effective wet fraction. Local water layer equivalent thickness and time needed for the complete defogging are evaluated for different indoor conditions. The influence of anti-fog coatings is investigated comparing different droplets contact angle, from 30° to 90°.

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Visual defect detection for historical building preservation

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Expert Systems with Applications 2025年 291卷

作者： Mengqiu Cheng Xinting Zhang Leihua Xia Junming Chen Jiayuan Xie Zongfang Ma Qing Li School of Mechanical and Electrical Engineering Xi’an University of Architecture and Technology Xi’an China School of Information and Control Engineering Xi’an University of Architecture and Technology Xi’an China Department of Computing Hong Kong Polytechnic University Hong Kong SAR China Faculty of Humanities and Arts Macau University of Science and Technology Macau China Department of Mathematics The University of Hong Kong Hong Kong SAR China

Advancements in automated building defect detection technology are essential for preserving historical architecture. Although existing intelligent technologies have made notable progress in detecting defects in modern residential buildings, their application to historical buildings faces significant challenges due to the complexity of structures, material diversity, and long-term natural and human-induced deterioration. This study focuses on historical buildings in Guangzhou, China, and introduces a dedicated task for detecting defects in such buildings. To support this task, a high-quality, customized dataset has been developed as a research foundation. To address challenges such as image blurriness during data collection and the complex structural characteristics of historical buildings, this study proposes a baseline model named Deblur-DetNet. The model employs a two-stage approach that integrates image deblurring and defect detection, significantly enhancing both accuracy and robustness. Experimental results demonstrate that the proposed method performs exceptionally well in the task of historical building defect detection, particularly in identifying fine-grained defects. This research provides robust technical support for the protection and restoration of historical buildings and establishes a solid foundation for further studies in cultural heritage preservation. Our dataset is available at https://***/file/d/1-9NiAw0hzomWHOA9RMEMXOOwIq5HScPx/view?usp=sharing .

关键词： Computer vision Defect detection Historical building Image deblurring technology

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The non-smooth story of different masonry towers damaged by the central Italy seismic sequence of 2016 7

The non-smooth story of different masonry towers damaged by ...

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7th International Conference on Computational Methods in Structural Dynamics and Earthquake engineering, COMPDYN 2019

作者： Clementi, F. Ferrante, A. Giordano, E. Lenci, S. Department of Civil and Building Engineering and Architecture Polytechnic University of Marche via Brecce Bianche Ancona60131 Italy

ISBN: (纸本)9786188284463

The Non-Smooth Contact Dynamics method (NSCD) has been applied to the study of the seismic response of different belfries inside the epicentral zone of the last Centre Italy earthquakes of August and October 2016. According to this model, the masonry towers have been modelled as a system of rigid blocks, and since the contacts between blocks are governed by the Signorini's impenetrability condition and by dry-friction Coulomb's law, the towers exhibit discontinuous dynamics. The NSCD method has proved to be a powerful tool for investigating the dynamics induced by ground seismic accelerations. Indeed, the numerical results have given a deep insight into the seismic vulnerability of these damaged towers, confirming several possible failure mechanisms. Copyright © 2019 COMPDYN Proceedings. All rights reserved.

关键词： Towers

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Advanced seismic analyses of "apennine churches" stroked by the central italy earthquakes of 2016 by the non-smooth contact dynamics method 6th

Advanced seismic analyses of "apennine churches" stroked by ...

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6th International Conference on Mechanics of Masonry Structures Strengthened with Composite Materials, MuRiCo6 2019

作者： Ferrante, Angela Ribilotta, Elisa Giordano, Ersilia Clementi, Francesco Lenci, Stefano Department of Civil and Building Engineering and Architecture Polytechnic University of Marche via Brecce Bianche Ancona60131 Italy

ISBN: (纸本)9783035715651

The dynamic behaviour and the seismic vulnerability of different masonry "Apennine Churches", dramatically damaged by the last shocks sequence of 2016 that occurred in Central Italy, have been studied in this paper by means of advanced 3D numerical analyses with the Discrete Element Method (DEM). Thus, a discontinuous approach has been used to assess the dynamic properties and the vulnerability of the masonry structure, through large deformations regulated by the Signorini’s law, concerning the impenetrability between the rigid bodies, and by the Coulomb’s law, regarding the dry-friction model. The major purpose of this study is to highlight that relevant data on the real structural behaviour of historical masonry can be provided through advanced numerical analyses. The comparison between the results of the numerical simulation and the survey of the existing crack pattern of the churches permitted to validate the used approach. Finally, from the results and conclusions of these cases study, it is possible to affirm that the used methodology can be applied to a wide variety of historical masonry structure in Europe. © 2019 Trans Tech Publications Ltd, Switzerland.

关键词： Finite difference method

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Damage survey and advanced seismic analyses of different masonry churches after the central Italy earthquake of 2016 7

Damage survey and advanced seismic analyses of different mas...

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7th International Conference on Computational Methods in Structural Dynamics and Earthquake engineering, COMPDYN 2019

作者： Clementi, F. Giordano, E. Ferrante, A. Lenci, S. Department of Civil and Building Engineering and Architecture Polytechnic University of Marche via Brecce Bianche Ancona60131 Italy

ISBN: (纸本)9786188284463

This study presents a detailed failure analysis of different masonry churches, which were severely damaged during the 2016 Centre of Italy seismic sequence, using nonlinear (i.e., kinematic limit and pushover) analyses. The main aims of the numerical investigations are: (i) to carry out a sufficiently wide sensitivity study on different specific case studies to have an insight into the role played by the geometry - which is always unique for churches - and by the irregularities;(ii) to validate or address the limits of applicability of the most widespread conventional static approaches recommended by Italian Code. Copyright © 2019 COMPDYN Proceedings. All rights reserved.

关键词： Earthquakes

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