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Physical,mechanical and thermal properties of vacuum sintered HUST-1 lunar regolith simulant

International Journal of Mining Science and technology 2024年第9期34卷 1243-1257页

作者： Wenbin Han Yan Zhou Lixiong Cai Cheng Zhou Lieyun Ding National Center of Technology Innovation for Digital Construction Huazhong University of Science and TechnologyWuhan 430074China School of Civil and Hydraulic Engineering Huazhong University of Science and TechnologyWuhan 430074China School of Civil Engineering and Architecture Wuhan University of TechnologyWuhan 430070China

Establishing a base on the Moon is one of the new goals of human lunar exploration in recent *** lunar regolith is one of the most potential building materials for lunar *** physical,mechanical and thermal properties of sintered lunar regolith are vital performance indices for the structural design of a lunar base and analysis of many critical mechanical and thermal *** this study,the HUST-1 lunar regolith simulant(HLRS)was sintered at 1030,1040,1050,1060,1070,and 1080℃.The effect of sintering temperature on the compressive strength was investigated,and the exact value of the optimum vacuum sintering temperature was determined between 1040 and 1060℃.Then,the microstructure and material composition of vacuum sintered HLRS at different temperatures were *** was found that the sintering temperature has no significant effect on the mineral composition in the temperature range of 1030-1080℃.Besides,the heat capacity,thermal conductivity,and coefficient of thermal expansion(CTE)of vacuum sintered HLRS at different temperatures were *** heat capacity of sintered samples increases with the increase of test temperature within the temperature range from-75 to 145℃.Besides,the thermal conductivity of the sintered sample is proportional to ***,the two temperatures of 1040 and 1050℃were selected for a more detailed study of mechanical *** results showed that compressive strength of sintered sample is much higher than tensile *** study reveals the effects of sintering temperature on the physical,mechanical and thermal properties of vacuum sintered HLRS,and these material parameters will provide support for the construction of future lunar bases.

关键词： Lunar base Lunar regolith simulant Vacuum sintering Physical properties Mechanical properties Thermal properties

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Damage detection of truss bridge elements using an enhanced pseudo-local flexibility method

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Journal of civil Structural Health Monitoring 2024年第3期14卷 615-634页

作者： Hsu, Ting-Yu Lu, Meng-Chen Yang, I-Tung Kim, Chul-Woo Chang, Kai-Chun Department of Civil and Construction Engineering National Taiwan University of Science and Technology Taipei Taiwan Department of Civil and Earth Resources Engineering Kyoto University Kyoto Japan

Vibration-based structural health monitoring aims to not only detect the occurrence of the damage but also identify the location of damage. The pseudo-local flexibility method (PLFM) is a vibration-based approach that only requires the identified modal parameters of the structure to perform damage detection. Thus, the cost of constructing a finite-element model of the structure and the modeling error of the finite-element model can be circumvented. In addition, the PLFM is based on the flexibility matrix of the structure, which is practical, because only the first few modes are required to estimate the necessary flexibility matrix and only the first few modes can be identified accurately in real applications. However, the potential damage region that is identified using the PLFM is indicated by the location of the center of the applied virtual forces, but not the potential damage elements. Hence, in this study, an enhanced PLFM (EPLFM) is proposed to improve the resolution of damage localization in the conventional PLFM. The regional rigidity ratios obtained by the PLFM are distributed to each element based on the virtual strain energy corresponding to virtual forces. The damage locations indicated by the EPLFM are marked at each element, and hence, more specific damage locations can be identified by the elements with smaller elemental rigidity ratios. Herein, the present EPLFM was numerically and experimentally validated with a simply supported steel-truss bridge. In the numerical validation, a simplified two-dimensional finite-element model for the truss structure was constructed using SAP2000 software package, and seven damage scenarios and two setups of measurement degrees of freedom (DOF) were investigated. It is found that accurate damage localization of the 2D simply supported truss structure was achieved when both the vertical and horizontal DOFs of all nodes were measured and the virtual force configurations acting on both ends of each element were used. In

关键词： Damage detection

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Necessity investigation of tie-down devices for single-pylon cable-stayed bridges to resist near-fault earthquakes with finite element models updated by vibration measurements

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Structure and Infrastructure engineering 2025年第4期21卷 563-578页

作者： Chen, Chien-Chou Wu, Wen-Hwa Kusbiantoro, Arief Lai, Gwolong Department of Civil and Construction Engineering National Yunlin University of Science and Technology Yunlin Taiwan Graduate School of Engineering Science and Technology National Yunlin University of Science and Technology Yunlin Taiwan

This paper aims to thoroughly investigate the necessity of designing tie-down devices at the boundaries of cable-stayed bridges to sustain near-fault earthquakes. The medium-span Chi-Lu Bridge, the long-span Kao-Pin-Hsi Bridge and the low-pylon Ma-Zu Bridge are chosen for a broad coverage. The finite element models for these three bridges are first updated with ambient vibration measurements and then modified by considering the compression-only feature of bearings to suit for seismic analyses. For Chi-Lu Bridge, the possibility of its deck to vertically jump out of the shear keys at the girder-pier connection under an exceptional near-fault earthquake is explicitly verified. The subsequent lateral swung of deck end in this case is further found to reach a significant level that can easily induce the damages near the pylon-deck intersection observed in the Chi-Chi earthquake. Therefore, the installation of tie-down devices is suggested for a medium-span cable-stayed bridge like Chi-Lu Bridge. In the case of Kao-Pin-Hsi Bridge, the analyzed results indicate that the capacity of tie-down devices originally designed to limit the uplift movement produced by live loads is not satisfactory to resist near-fault earthquakes. As for Ma-Zu Bridge, the corresponding results demonstrate that the addition of tie-down devices is normally not necessary. © 2023 Informa UK Limited, trading as Taylor & Francis Group.

关键词： Vibration measurement

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Automated vision-based post-earthquake safety assessment for bridges using STF-PointRend and EfficientNetB0

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Structural Health Monitoring 2024年第2期23卷 776-795页

作者： Cheng, Min-Yuan Sholeh, Moh Nur Harsono, Kenneth Department of Civil and Construction Engineering National Taiwan University of Science and Technology Taipei Taiwan

Bridges are critical transportation infrastructure in Taiwan that are at high risk of structural damage during major earthquake incidents. The structural health monitoring method currently used to assess bridge safety nationwide is labor-intensive and expensive to implement. In this study, a novel automated bridge safety assessment system was developed to facilitate post-earthquake bridge inspections using symbiotic organism search-transfer learning-PointRend (STF-PointRend) for component and damage type detection, EfficientNetB0 for damage level detection, and earthquake resistance index for safety assessment. In the case studies, the STF-PointRend model obtained good testing results, with global mean Intersection over Union values of 76.31 and 75.47% for bridge-component and damage-type detections. Furthermore, the EfficientNetB0 model obtained an average F1 score of 0.86 for damage-level detection in the testing results. The developed model was used to conduct a safety evaluation of two bridges (Lempenge I and Luk I) that had suffered damage in a 2018 earthquake in Palu, Indonesia. The earthquake-resistance scores of 56.15 and 53.21 respectively earned by the two bridges indicate that both require immediate maintenance. © The Author(s) 2023.

关键词： Image recognition

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ConXR: A Comparative Participatory Platform for construction Progress Monitoring

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Journal of The Institution of Engineers (India): Series A 2024年第2期105卷 249-259页

作者： Sindhu Pradeep, Megha Reja, Varun Kumar Varghese, Koshy Building Technology and Construction Management Division Department of Civil Engineering Indian Institute of Technology Madras Chennai600036 India Faculty of Engineering and IT University of Technology Sydney Sydney Australia

Existing progress monitoring systems in the construction industry rely heavily on manual data entry and have limited visualization capabilities. Although several researchers have attempted to address these deltas through various automated technologies, their practical implementation in sites has not reached its full potential. This could be achieved through easy-to-implement platforms that facilitate automated data capture and visual representation of progress, thereby providing a better understanding of the project status and facilitating improved project controls. Furthermore, features to visualize the performance of multiple crews will enable comparative analysis and establish improved benchmarks for the project goals. ConXR, a platform that integrates automated data capture, an extended reality environment for progress visualization, and comparative participant analysis, is proposed. ConXR is designed to be a structured platform that displays as-planned and as-built models generated from the automatically acquired data. In ConXR, crews are designated as the players within a competitive environment to enable comparative performance assessment in each construction stage. The architecture and development details of the platform are presented, along with an illustration of its application. The interactive features of ConXR have the potential to establish and achieve improved progress targets based on preceding crew performances. Furthermore, ConXR can enable immersive progress visualization of automatically acquired data as digital models. The novelty of ConXR lies in its comparative participatory features that enable crew performance evaluation by engaging them in an environment where constraints and their impacts are documented in a structured form. © The Institution of Engineers (India) 2024.

关键词： Visualization

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PREDICTION OF DAMPER ENERGY DISSIPATION AND MAXIMUM RESPONSE OF STRUCTURES WITH NONLINEAR VISCOELASTIC DAMPERS CONSIDERING PERFORMANCE DEGRADATION

Journal of Structural and Construction Engineering

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Journal of Structural and construction engineering 2023年第806期88卷 598-608页

作者： Tobari, Ryota Sato, Daiki JFE Civil Engineering & Construction Corporation FIRST Tokyo Institute of Technology Japan

In response estimation of seismic control structures, it is necessary to consider the performance degradation of dampers due to long-period seismic motion. In this paper the focus is given to structures with shear strain dependent nonlinear viscoelastic dampers. A method is proposed to predict the damper dissipated energy considering performance degradation in earthquakes. The dissipated energy is used to predict the maximum deformation response of the structure using existing energy methods. New expression are proposed for the evaluation of the equivalent number of cycles and the effective damper deformation ratio. The accuracy of these prediction methods is then evaluated. © 2023 Architectural Institute of Japan. All rights reserved.

关键词： Shear strain

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Inter-particle bonding mechanisms in biopolymer-hydrogel stabilized granular soils: A microscopic perspective

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Geomechanics and engineering 2025年第2期41卷 275-285页

作者： Lee, Sojeong Chang, Ilhan Korea Standard Construction Center Korea Institute of Civil engineering and Building Technology Goyang10223 Korea Republic of Department of Civil Systems Engineering Ajou University Suwon16499 Korea Republic of

Biopolymer-based soil treatment (BPST) enhances soil strength through biofilm matrix formation within soil voids. This study investigates the effects of biopolymer concentration, porosity, and soil packing conditions on biopolymer distribution and connectivity after dehydration. Laboratory experiments assessed the degree of biopolymer filling (DoBF), final condensed biopolymer concentration, and biopolymer film connectivity under simple cubic and rhombohedral packing conditions. The results show that higher initial biopolymer concentrations increase final biopolymer volume, though not proportionally due to threshold effects. Rhombohedral packing results in higher final condensed biopolymer concentrations than simple cubic packing, despite having lower DoBF values, while biopolymer connectivity peaks at an optimal porosity (n ≈ 0.35). Further analysis revealed a strong correlation between biopolymer matrix formation and soil mechanical properties, including uniaxial compressive strength (UCS), cohesion, and friction angle. UCS was found to decrease with increasing porosity, and a predictive model was developed using experimental data. The rhombohedral and simple cubic packing conditions respectively define the upper and lower bounds of the shear parameters. A back-calculation approach confirmed that DoBF provides the most accurate estimation of friction angle and UCS, reinforcing its importance as a key parameter in soil stabilization. These findings emphasize the need for optimized biopolymer concentration and soil structure adjustments to enhance reinforcement efficiency. The study offers valuable guidance for geotechnical applications, enabling the development of optimized biopolymer injection strategies that enhance mechanical performance and promote efficient material utilization. © 2025 Techno-Press, Ltd.

关键词： Compressive strength

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Integration of construction Progress Monitoring Results using AI Image Recognition from Multiple Cameras onto A BIM 41

Integration of Construction Progress Monitoring Results usin...

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41st International Symposium on Automation and Robotics in construction, ISARC 2024

作者： Hsieh, Chang-Cheng Chen, Hung-Ming Chen, Wan-Yu Wu, Ting-Yu Department of Civil & Construction Engineering National Taiwan University of Science and Technology Taiwan Department of Civil & Construction Engineering National Taiwan University of Science and Technology Taiwan Department of Civil & Construction Engineering National Taiwan University of Science and Technology Taiwan

ISBN: (纸本)9780645832211

This study merges artificial intelligence (AI) image recognition technology with Building Information Modeling (BIM), to develop a prototype system for the automation and visualization of construction site progress control. Our focus is the strategic deployment of multiple construction site surveillance cameras using a BIM model to encompass the entirety of the construction site. Following the capture of camera images, the application of object detection techniques within AI image recognition locates all actively constructed objects in the images, subsequently identifying the construction phases to which these objects belong. By integrating multiple camera perspectives from the site into a BIM model, the results of AI detection are automatically inputted into the corresponding components of the model. Finally, real-time on-site progress information obtained from the BIM model is compared with the progress schedule, and the comparative results are visually presented on the BIM model components in distinct colors. Through this visual approach, managerial personnel can intuitively and instantly control the construction progress. © 2024 ISARC. All Rights Reserved.

关键词： Visualization

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Finite element model of a cable-stayed bridge updated with vibration measurements and its application to investigate the variation of modal frequencies in monitoring

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Structure and Infrastructure engineering 2024年第5期20卷 760-770页

作者： Wu, Wen-Hwa Chen, Chien-Chou Kusbiantoro, Arief Lai, Gwolong Department of Civil and Construction Engineering National Yunlin University of Science and Technology Yunlin Taiwan Graduate School of Engineering Science and Technology National Yunlin University of Science and Technology Yunlin Taiwan

Ambient vibration measurements of a cable-stayed bridge in Taiwan were first conducted to identify its dominant modal parameters with a reliable stochastic subspace identification algorithm recently developed. A finite element model is then constructed based on the identified frequencies and shape vectors of four vertically bending, one torsional, and one horizontally bending modes. This model is also updated by adjusting the girder-pier connection with the addition of a rotational spring to reflect the actual conditions and its accuracy is demonstrated with less than 1% of error for the first two vertically bending modes. As a solid application for probing the environmental effects in structural health monitoring, the vibration measurements of 24 hours were further conducted and combined with the well calibrated model to investigate the controlling factor for its variation in modal frequencies. It is found that the frequencies of the first two vertically bending modes are closely correlated to the root-mean-square velocity representing the traffic excitation intensity. Moreover, it is shown with the updated model that the daily variations in the frequencies of the first two vertically bending modes can be reasonably simulated by modifying the coefficient of the rotational spring merely in a limited range. © 2022 Informa UK Limited, trading as Taylor & Francis Group.

关键词： Structural health monitoring

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Local impact factor assessment for deck slabs of steel–concrete composite bridge system with twin girders

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Frontiers of Structural and civil engineering 2024年第12期18卷 1937-1950页

作者： Libin YANG Weibing PENG Yingjie NING Xueliang LIU Ertugrul TACIROGLU College of Civil Engineering Zhejiang University of TechnologyHangzhou 310014China Zhejiang Communications Construction Group Co.Ltd. Hangzhou 310000China Department of Civil and Environmental Engineering University of CaliforniaLos AngelesCA 90095USA

The steel-concrete composite bridge system with twin girders,referred to as a steel plate composite girder bridge,is widely adopted for short-to medium-span highway bridges due to its ability to enable rapid prefabrication and construction in bridge *** the structural design of steel plate composite girder bridges,which are wide but shallow in depth,their deck slabs are vulnerable to vertical impacts from vehicle *** performance may be negatively affected by excessive dynamic displacement of deck *** is difficult to assess the dynamic response of the deck slabs by existing methods,since traditional specifications only use a global impact factor to describe the dynamic effect of moving vehicles on the bridge as a whole,regardless of the local dynamic effect on the deck ***,this study aims to assess the local dynamic effect of moving vehicles on the deck slabs of steel plate composite beam bridges using field tests and finite-element methods.A systematic approach was employed to analyze parameters influencing bridge-vehicle ***,an improved method was presented to calculate the local impact factor and parametric studies were *** findings indicated that the local impact factor of deck slabs is significantly greater than the global impact *** surface roughness is the most significant parameter affecting deck slab dynamic behavior.

关键词： steel plate composite girder bridge deck slab local impact factor field test finite-element modeling parametric study

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