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5th International Conference on Computers, Information Processing and Advanced Education, CIPAE 2024

作者： Zhang, Jian Chen, Huazhou Chen, Zhihua Meng, Xiangchong Wang, Rui Zhang, Wenling Wang, Heng Tao, Xin Zhang, Pengfei Huang, Xiaokang Pan, Guangyuan Shang, Pengfei China Construction Science and Industry Corporation LTD. Shenzhen518000 China Department of Civil Engineering Tianjin University Tianjin300000 China College of Civil Engineering Taiyuan University of Technology Taiyuan030024 China Limited Tianjin300000 China

ISBN: (纸本)9798331527662

Three-dimensional (3D) reconstruction technology plays a crucial role in various fields, especially in civil engineering, where it is essential for the monitoring and management of infrastructure such as buildings, bridges, and roads. This paper presents a simplified 3D reconstruction method specifically designed for large-span and high-precision grid structures. The method reduces computational complexity and enhances reconstruction accuracy by describing grid structure nodes with only four basic parameters: three spatial coordinates and a radius parameter. Utilizing image data captured by Unmanned Aerial Systems (UAS) and combined with deep learning algorithms, this study successfully achieved high-precision 3D reconstruction of a partial grid structure in a sports stadium in Hebei. Additionally, this paper reviews single-image 3D reconstruction methods based on deep learning, UAS-assisted 3D reconstruction techniques, and the application and challenges of 3D reconstruction technology in civil engineering. Finally, the paper discusses future research directions, including enhancing algorithm robustness, processing large-scale data, fusing multi-source data, and developing real-time reconstruction systems. © 2024 IEEE.

关键词： Stadiums

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Three-dimensional strength criterion for rocks:A review

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Energy Reviews 2024年第4期3卷 99-120页

作者： Jiacun Liu Xing Li Junjie Xiao Yachen Xie Kaiwen Xia State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation Tianjin University Tianjin300072China School of Engineering and Technology China University of Geosciences(Beijing)Beijing100083China Department of Civil and Mineral Engineering University of TorontoM5S 1A4TorontoONCanada College of Water Resources and Hydropower Sichuan UniversityChengdu610065China

Deep rocks are typically under a true-triaxial stress state. The strength of deep rock is thus dictated by both the direction and magnitude of principal stresses. The formulation of three-dimensional strength criterion for rocks is thus essential for evaluating the stability of deep-buried rock structures. With advancements in true-triaxial experimental instrumentation, several three-dimensional strength criteria have been proposed, necessitating a systematic review and consolidation of these criteria. This review first introduces the concept of three-dimensional stress state. Subsequently, classical strength criteria such as the Mohr-Coulomb Criterion, the Hoek-Brown criterion, and the Drucker-Prager criterion are reiterated. However, these traditional strength criteria inadequately describe rock strength under true-triaxial stress conditions. To better capture the influence of intermediate principal stress, hydrostatic pressure, and Lode angle on rock strength, researchers have revised classical strength criteria. Modified strength criteria and unified strength criteria based on classical formulations are also introduced. Notably, the unified strength criterion incorporates multiple single criteria and demonstrates wider applicability. Furthermore, beyond macroscopic strength criteria, this review also discusses micromechanical strength criteria, where the stress state and crack propagation govern rock mechanical behaviors. This comprehensive review may serve as a valuable source for addressing the problem of deep rock strength in energy extraction and other rock engineering applications.

关键词： True triaxial Intermediate principal stress Lode angle Strength criterion Failure envelope

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Research on the Clamping Force Performance of Cable Clamps on Long-Span Suspension Bridges Under Solar Radiation 10th

Research on the Clamping Force Performance of Cable Clamps o...

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10th International Conference on civil engineering, ICCE2023

作者： Cai, Yue Tian, Zhongchu Wang, Guibo Zeng, Hao Liu, Cheng School of Civil Engineering Changsha University of Science and Technology Hunan Changsha410114 China School of Civil Engineering Fujian University of Science and Technology Fujian Fuzhou350118 China China Railway Construction Bridge Engineering Bureau Group First Engineering Co. Ltd. Liaoning Dalian116000 China China Railway Construction Port and Navigation Group Co. Ltd. Guangdong Zhuhai519070 China Guizhou Provincial Transportation Construction Project Quality Supervision and Law Enforcement Detachment Guizhou Guiyang55002 China

ISBN: (纸本)9789819743544

The anti-slip performance of cable clamps is one of the important structures to ensure the safety of suspension bridges, and there is currently limited research on the influence of temperature. by using validated meteorological data, an ABAQUS thermal coupling model is established to obtain the steady-state temperature field for a representative period and apply it as a mapped field to analyze the stress results of the cable clamp-main cable structure. The analysis concludes that the derived analytical solution in this study is close to the numerical solution of the finite element method, with a maximum error of 4.2%, meeting the requirements of practical engineering. The increase in temperature of the screw itself reduces the pre-tensioning force, while the increase in structural temperature, when the screw does not experience temperature variation, can actually increase the friction force of the cable clamp to some extent, which is beneficial for improving the friction resistance of the cable clamp. During the installation of cable clamps, it is recommended to perform it at low temperatures, and the surface of the screw can be thermally insulated to maximize the increase in friction force caused by structural temperature rise. © The Author(s) 2024.

关键词： Solar radiation

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High-strength fiber reinforced concrete production with incorporating volcanic pumice powder and steel fiber: sustainability, strength and machine learning technique

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Asian Journal of civil engineering 2024年第8期25卷 6171-6187页

作者： Mehedi, Md. Tanjid Sobuz, Md. Habibur Rahman Hasan, Noor Md. Sadiqul Jabin, Jannat Ara Nijum, Nusrat Jahan Miah, Md Jihad Department of Building Engineering and Construction Management Khulna University of Engineering and Technology Khulna 9203 Bangladesh Department of Civil Engineering International University of Business Agriculture and Technology Dhaka 1230 Bangladesh School of Natural and Built Environment Queen’s University Belfast Belfast BT9 5AG United Kingdom

This study examines the properties of high-performance fiber-reinforced concrete (HPFRC) mixes fabricated with five different replacements (0%, 5%,15%,20%, and 25%) of cement with volcanic pumice powder (VPP)and 0.5% and 1% of steel fiber. The outcomes reveal that the VPP and steel fiber blends exhibited significantly higher compressive and splitting tensile strength than the control mix, where a decline in workability and enhancement in density was registered. The HPFRC fabricated with 10% VPP and 1% steel fiber produced the best mechanical performance results among all the combinations. Furthermore, to predict the natural and mechanical properties of the HPFRC as a result of the influencing factors, extensive comparative modeling was performed, and various predictive models were proposed using regressions and machine learning (ML) techniques, i.e., artificial neural network (ANN), random forest (RF). Root-mean-squared error, mean absolute percentage error, and coefficient of determination were just a few of the metrics used to assess the quality of the models. RF was shown to have the highest R² and the lowest Root Mean Squared Error (RMSE), considering it the most effective model. Considering a strategy for environmental sustainability, this study highlights the importance of minimizing carbon footprint by lowering cement consumption. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2024.

关键词： Cost and eCO2 emissions Fresh and hardened properties High-Performance Concrete Machine learning Volcanic Pumice Powder

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CONVERTING MEMBER MODELS INTO EQUIVALENT SHEAR SPRING MODELS FOR HIGH-RISE PASSIVE CONTROL BUILDINGS WITH STUD-TYPE VISCOELASTIC DAMPERS AND HYSTERETIC DAMPERS IN PARALLEL

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AIJ Journal of technology and Design 2022年第68期28卷 103-108页

作者： Kinoshita, Ryosuke Sato, Daiki Tobari, Ryota Yasunaga, Jumpei Ueki, Takuya Kaneshiro, Yosuke School of Environment and Society Tokyo Institute of Technology Japan FIRST Tokyo Institute of Technology Japan JFE Civil Engineering & Construction Corporation JFE Steel Corporation

In recent years modeling methods of equivalent shear spring models for passive control structures have been proposed. However, no methods are available for configurations with multiple kinds of dampers in parallel. Thus, in this paper, a method is proposed to create an equivalent shear spring model of passive control structures with parallel configurations of stud-type viscoelastic dampers and hysteretic dampers. The parameters of the proposed model are calculated by considering the response of the structure in four states. This paper shows that the proposed modelling method can accurately reproduce the results of time-history analysis of member models. © 2022 Architectural Institute of Japan. All rights reserved.

关键词： Viscoelasticity

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Approaches for Teaching Shear Analysis and Design of Reinforced Concrete

Approaches for Teaching Shear Analysis and Design of Reinfor...

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Best Practices and Lessons Learned for Teaching Concrete Materials and Reinforced Concrete 2021

作者： Lovell, Matthew D. Floyd, Royce W. Dymond, Benjamin Z. Hover, Kenneth C. The Department of Civil and Environmental Engineering Rose-Hulman Institute of Technology United States The School of Civil Engineering and Environmental Science The University of Oklahoma United States The Department of Civil Engineering Construction Management and Environmental Engineering Northern Arizona University United States Cornell University IthacaNY United States

ISBN: (纸本)9781641952361

This paper presents an overview of shear analysis and design based on the ACI 318-19 Building Code Requirements for Structural Concrete as it relates to an introductory reinforced concrete course. The important content related to this topic is summarized and several effective active learning strategies and pedagogical resources are presented to augment and enhance student learning for this challenging topic. The description of each active learning activity also includes a discussion of the underlying pedagogical theory, an estimate of preparation and implementation time, and recommendations for implementation. The paper also highlights lessons learned from the authors based on observations from several years of instruction. © 2023 American Concrete Institute. All rights reserved.

关键词： Reinforced concrete

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Floating forest:A novel breakwater-windbreak structure against wind and wave hazards

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Frontiers of Structural and civil engineering 2021年第5期15卷 1111-1127页

作者： Chien Ming WANG Mengmeng HAN Junwei LYU Wenhui DUAN Kwanghoe JUNG School of Civil Engineering The University of QueenslandQueensland 4072Australia Department of Civil Engineering Monash UniversityVictoria 3168Australia Hyundai Engineering and Construction Technology Research CentreSeoul 03058Korea

A novel floating breakwater-windbreak structure(floating forest)has been designed for the protection of vulnerable coastal areas from extreme wind and wave loadings during storm *** modular arch-shaped concrete structure is positioned perpendicularly to the direction of the prevailing wave and *** structure below the water surface acts as a porous breakwater with wave scattering *** array of tubular columns on the sloping deck of the breakwater act as an artificial forest-type windbreak.A feasibility study involving hydrodynamic and aerodynamic analyses has been performed,focusing on its capability in reducing wave heights and wind speeds in the lee *** study shows that the proposed 1 km long floating forest is able to shelter a lee area that stretches up to 600 m,with 40%–60%wave energy reduction and 10%–80%peak wind speed reduction.

关键词： floating structure breakwater windbreak hydrodynamic CFD

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Efficiency of Using Recycled Coarse Aggregate for Internal Curing of Blended Cement Concretes 12

Efficiency of Using Recycled Coarse Aggregate for Internal C...

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12th ACI/RILEM International Conference on Cementitious Materials and Alternative Binders for Sustainable Concrete, ICCM 2024

作者： Viacheslav, Troian Volodymyr, Gots Alex, Bruno Rafal, Panek Flatt Robert, J. Department of Technology of Building Structures and Products Kyiv National University of Construction and Architecture Ukraine Department of Technology of Building Structures and Products The Faculty of Construction and Technology Kyiv National University of Construction and Architecture Ukraine Department of Civil Environmental and Geomatic Engineering ETH Zurich Switzerland ETH Zürich Switzerland

ISBN: (纸本)9781641952507

It is known that the use of recycled coarse aggregates (RCA) can raise a variety of problems, which are mainly due to the porosity of the old mortar contained in RCA. One of the simpler ways to solve these problems is the pre-wetting of RCA, which allows not only to minimize disadvantages, but also to obtain the advantages associated with the effect of internal curing. Undoubtedly, the strongest positive effect of pre-wetted RCA is on the rheology of recycled concrete. But there are also possible positive effects of internal curing for strength and durability of blended cement concretes, which require longer curing times compared to normal portland cement concrete. In this paper, we mostly study influence of porous RCA on the rheology of cement paste, based on slag cement with a 75% slag content. For this purpose, the absorption properties of RCA of different sizes were studied. Form this, mathematical dependences of workability of cement systems on W/C and time could be obtained. These further underline the positive effect of pre-wetting of RCA with regard to retaining the workability of cementitous systems. This lays the basis for a broader study of pre-wetting RCA on rheology of mixtures, strength and durability to be covered in future publications. © 2024 American Concrete Institute. All rights reserved.

关键词： Slag cement

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Determining Soil Parameters in Deep Excavation Using Displacement Inverse Analysis Method 12

Determining Soil Parameters in Deep Excavation Using Displac...

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12th Academic Conference of Geology Resource Management and Sustainable Development, GRMSD 2024

作者： Li, Fangang Zhao, Xiaopeng Feng, Xiaojian Ruan, Jinsong Wang, Yixian Anhui Gourgen Traffic Construction Co. Ltd. Hefei230041 China School of Civil Engineering Hefei University of Technology Hefei230009 China

ISBN: (纸本)9798331314545

In deep foundation engineering, accurately determining key parameters of soil is crucial for the accuracy of analysis results. The correction of soil layer parameters is of great significance for studies such as deep and large foundation engineering. Taking a deep and large foundation engineering project as an example, this paper determines the key parameters of the soil layer through sensitivity analysis and designs an orthogonal experiment to obtain samples. It then conducts numerical simulations for analysis. A neural network is established to map the surface settlement with soil layer parameters, thereby inverting the soil layer parameters. Combining the measured settlement data, the paper verifies the precision of the inverted parameters using the inverse analysis model. The research results show that using the inverted soil layer parameters for the forward analysis yields surface settlement that closely matches the measured values, with a maximum error of only 8.22%. This indicates that the inverse analysis method based on parameter sensitivity analysis and BP neural network can effectively reflect the mapping relationship between surface settlement and soil layer parameters. Therefore, the methods and results of this study have guiding significance for similar engineering design and implementation. © 2024 Proceedings of the 12th Academic Conference of Geology Resource Management and Sustainable Development, GRMSD 2024. All rights reserved.

关键词： Sensitivity analysis

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Vertical temperature gradients of concrete box girder caused by solar radiation in Sichuan-Tibet railway

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Journal of Zhejiang University-Science A(Applied Physics & engineering) 2022年第5期23卷 375-387页

作者： Tao SHI Xing-wang SHENG Wei-qi ZHENG Ping LOU School of Civil Engineering Central South UniversityChangsha 410075China National Engineering Research Center of High-Speed Railway Construction Technology Changsha 410075China MOE Key Laboratory of Engineering Structures of Heavy Haul Railway Central South UniversityChangsha 410075China

Spatial and temporal temperature variations are critical for concrete box girders,and non-uniform temperature distributions induced by solar radiation depend on the structural shapes and shadows cast on *** have been many studies of temperature distributions and temperature gradients of concrete box girders,but few have considered a high altitude plateau climatic *** this study,the nonlinear temperature distributions of concrete box girders in the Sichuan-Tibet railway caused by solar radiation were investigated based on experimental analysis,real-time shadow-selection algorithm,and finite element ***,a vertical temperature gradient model of the concrete box girders was *** vertical temperature gradient values first rise,then decrease,and finally rise again from Chengdu to Lhasa,with samples forming a normal *** recommended vertical temperature gradient value was 25℃with a confidence interval of 95%.This provides a reference for the design and maintenance of concrete box girders on the Sichuan-Tibet railway.

关键词： Concrete box girder Solar radiation Temperature gradient Sichuan-Tibet railway Probability statistics

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