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Study on the energy evolution mechanism of low-temperature concrete under uniaxial compression

Research in Cold and Arid Regions 2022年第3期14卷 162-172页

作者： QinYong Ma Kweku Darko Forson School of Civil Engineering and Architecture Anhui University of Science and TechnologyHuainanAnhui 232001China Engineering Research Center of Underground Mine Construction Ministry of EducationAnhui University of Science and TechnologyHuainanAnhui 232001China

In order to study the mechanical properties and energy evolution of low-temperature concrete during uniaxial compres‐sion, a uniaxial compression test was performed on concrete. In addition, the evolution laws of compressive strength, deformation modulus and total energy, elastic potential energy, dissipated energy and peak energy of concrete in the process of deformation and failure are analyzed. The effects of age and temperature on low-temperature concrete is analyzed from the perspective of energy. Test results show that temperature improves the strength and deformation of concrete to varying degrees. When cured for 28 days, the compressive strength and deformation modulus of concrete at −20 ℃ is increased by 17.98% and 21.45% respectively, compared with the compressive strength and deformation modulus at room temperature of 20 ℃. At the point of failure of the concrete under uniaxial compression, the total damage energy and the dissipation energy both increase, while the developed elastic strain energy increases and then decreases. Increase in curing duration tends to increase the total destruction energy of concrete, peak point elastic strain energy, peak point dissipation energy, and peak point total energy. Whereas increase in curing durations, has shown to decrease the total destruction energy of concrete, the peak point elastic strain energy, peak point dissipation energy, and peak point total energy. The peak point strain energy reflects the ability of low-temperature concrete to reasonably resist damage. By using the principle of energy analysis to study the deformation process of concrete, it provides research methods and ideas for the deformation analysis of this type of material under load.

关键词： low-temperature concrete uniaxial compression mechanical properties energy mechanism dissipated energy

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Computational Modeling of Cured-in-Place Structural Liner for Aged Pipeline Rehabilitation

Computational Modeling of Cured-in-Place Structural Liner fo...

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ASCE Inspire 2023: Infrastructure Innovation and Adaptation for a Sustainable and Resilient World

作者： Duan, Junyi Tao, Chengcheng Huang, Ying School of Construction Management Technology Purdue Univ. West LafayetteIN United States Dept. of Civil Construction and Environmental Engineering North Dakota State Univ. FargoND United States

ISBN: (数字)9780784485163

ISBN: (纸本)9780784485163

Pipeline infrastructure is crucial to help economic growth across the country. Pipelines are used to gather, transport, and distribute water, oil, or gas to end-use consumers. More than half of the pipelines in the US have been in service for more than 60 years. Cured-in-place pipe (CIPP) structural liner is a trenchless rehabilitation method to repair aged underground pipelines. Carbon fiber-reinforced polymer (CFRP) is a popular liner material used to rehabilitate and improve the service of pipelines. To investigate the effect of CFRP liner on pipeline maintenance and rehabilitation, we simulate the mechanical properties of CFRP liner for damaged pipeline rehabilitation through three-dimensional finite element analysis. A parametric study is conducted to demonstrate the effect of liner thickness and in-pipe pressure on the performance of the CFRP liner rehabilitation. The computational modeling results exhibit the relationship between liner thickness and rehabilitation effect, and the stress concentration location at the damaged area. The results of the paper can be applied for the optimal design of CIPP liner and enhanced sustainability and resilience of the US pipeline systems. © 2023 by the American Society of civil Engineers. All Rights Reserved.

关键词： Pipelines

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Prototyping of digitally manufactured thin glass composite façade panels 8

Prototyping of digitally manufactured thin glass composite f...

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8th International Conference on the Architectural and Structural Application of Glass, CGC 2022

作者： Pfarr, Daniel Louter, Christian Institute of Building Construction Faculty of Civil Engineering Technische Universität Dresden Dresden Germany Structural Design & Building Engineering Faculty of Civil Engineering & Geosciences Delft University of Technology Delft Netherlands

The use of thin glass promises to enable a variety of construction industry pursuits. In addition to the ecological benefits of more efficient use of resources, architects can anticipate new design freedoms with thin glass. Based on the sandwich theory, the flexible thin glass can be combined with a 3D-printed open-cell polymer core to form a very rigid yet lightweight composite element. This paper presents an exploratory attempt on the digital manufacturing of thin glass composite façade panels with an industrial robot. It explains the idea of a digital "file-to-factory"-workflow which includes Computer-Aided Design (CAD), engineering (CAE) and Manufacturing (CAM). The research shows a parametric design process to enable the seamless integration of digital analytic tools. Furthermore, this process shows the potentials and challenges of the digital manufacturing of a thin glass composite panel. Here, partial production steps executed by an industrial robot arm, such as large-format additive manufacturing, mechanical surface preparation, bonding and assembly process are explained. Finally, a first insight into mechanical properties of the composite panel are experimentally and numerically investigated and evaluated under surface load. The general concept of the digital design and manufacturing workflow as well as the results of the experimental study provide the background for the integration of further form-finding and analysis methods as well as the implementation of extensive mechanical investigations in future research. © The Author(s) 2023.

关键词： 3D printing

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Suitable Passive Design Strategies for Residential High-rise Buildings in Sri Lanka 9

Suitable Passive Design Strategies for Residential High-rise...

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9th International Multidisciplinary Moratuwa engineering Research Conference, MERCon 2023

作者： Perera, Udara Sachinthana Tharaka, M.G.I. Weerasuriya, A.U. Lewangamage, C.S. Ruparathna, R. Mallawaarachchi, R. Sri Lanka Institute of Information Technology Department of Civil Engineering Malabe Sri Lanka University of Moratuwa Department of Civil Engineering Katubedda Sri Lanka Hong Kong Metropolitan University Department of Construction and Quality Management Ho Man Tin Hong Kong University of Windsor Department of Civil and Environmental Engineering Windsor Canada Sri Lanka Technological Campus Department of Civil Engineering Padukka Sri Lanka

ISBN: (纸本)9798350345216

Despite the potential to reduce Energy Use Intensity (EUI), passive design strategies (PDS) have been sparsely integrated into residential high-rise buildings in Sri Lanka partly due to the lack of scientific lnowledge available for the construction industry professionals. To bridge this knowledge gap, this study presents a set of guidelines for choosing suitable PDSs for residential high-rise buildings in Sri Lanka. The guidelines are based on the findings of local (LSA) and global (GSA) sensitivity analyses, which evaluated seven popular PDSs in the Sri Lankan construction industry. LSA revealed how EUI varied with PDSs and the most and least reductions for low e-coating on glasses (WS) and multiple glazing (GU). GSA ranked WS and GU as the most and least influential PDSs and categorized the seven PDSs into three groups based on the effect of PDS on EUI in the presence of other PDSs. An evaluation of sir PDSs: five combinations and one individual PDS (WS) suggested the combinations should be established between the most influential parameters in the same group to marimize EUI saving. A significant difference in popularity and efficiency was found for the seven PDSs, as the most popular PDSs are the least effective in saving EUI. © 2023 IEEE.

关键词： construction industry

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Punching Shear Behavior of HSC Slab–Column Connection Under Cyclic Loading

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Transactions of the Indian National Academy of engineering 2023年第1期9卷 155-173页

作者： Onse, Assefa Erkocho Aure, Temesgen Wondimu Department of Civil Engineering College of Architecture and Civil Engineering Addis Ababa Science and Technology Addis Ababa Ethiopia Department of Civil Engineering College of Engineering Centre of Excellence in Construction Quality and Technology Addis Ababa Science and Technology University Addis Ababa Ethiopia

The absence of beams in flat slab systems usually lead to excessive deformation of the slab and punching shear failure at the slab–column connection. Several researches have been conducted to enhance the connection region. The main objective of this research is to investigate the punching shear behavior of a slab–column connection using high-strength concrete (HSC) in the critical section of the connection under cyclic loading. Nonlinear finite element analysis for normal- and high-strength concrete in ABAQUS/Standard is used to simulate the slab–column connections. The accuracy of the model is verified using experimental results conducted by other researchers. The control specimen for the current study is developed from the validation specimen by providing high-strength concrete at the critical section, and a steel section in the column. Then an extensive parametric study has been investigated to evaluate the effects of slab thickness, gravity shear ratio, column aspect ratio, and prestressing force. The results indicated that, despite the increase in the lateral load-carrying capacity, the HSC slab thickness decreases the drift capacity of the connection. Also, the specimens with increased slab thickness from 200 to 300 mm and column aspect ratio from 1 to 2 increased the energy dissipation and the initial stiffness of the connection by about 4%, 47%, 43%, and 35%, respectively. However, the specimen with an increased gravity shear ratio from 0.3 to 0.6 decreased the energy dissipation at failure and initial stiffness degradation capacity of the HSC slab–column connection by 4% and 13%, respectively. The prestressing force increased the initial stiffness and energy dissipation more than the control specimen and moved the crack away from the critical section.

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Enhancement of the mariculture wastewater treatment based on the bacterial-microalgal consortium

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Materials Science for Energy Technologies 2022年 5卷 110-115页

作者： Xie, Binghan Li, Zhipeng Si, Dashuai Yang, Xiaodong Qu, Xiankun Liang, Heng Yan, Zhongsen You, Hong State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology Harbin150090 China School of Marine Science and Technology Harbin Institute of Technology at Weihai Weihai264209 China The Second Construction Limited Company of China Construction Eighth Engineering Division Jinan250014 China College of Civil Engineering Fuzhou University Fuzhou350116 China

Though bacterial-microalgal consortium (BM) system showed significant advantages for the mariculture wastewater treatment, how the high saline to the degradation of nitrogen, phosphorus and organic component shift need to be further investigated. In this study, three systems including the microalgae system (MA), activated sludge system (AS) and BM were parallel operated. The mariculture wastewater treatment performance and the shifts of soluble microbial products (SMPs) components were compared among the above systems. The result showed that the highest removals of NH4+-N (92.78%), PO43−-P (79.47%) and total organic carbon (TOC) (81.67%) were obtained in the BM system. This result demonstrated that the confederate effect between bacteria and microalgae showed satisfying mariculture wastewater treatment performance compared to the individual MA or AS system. In terms of the SMP production, the high salinity resulted in much SMP accumulation (178.89 mg/L of protein and 71.35 chancinmg/L of carbohydrate) in the MA system. Fortunately, the high salinity inhibition effect was dramatic reduction with less SMP accumulation in the BM system. The EEM result showed amounts of macromolecular organics of protein (aromatic-like substances and tryptophan-like substances) were the main components in the MA system, which were much higher than that in the AS and BM system. This indicated the macromolecular protein-like matters could not be removed absolutely based the individual MA system. Comparatively, the composition of SMP was shifted by the bacterial-microalgal consortium with less humic-like matters and tryptophan-like matters production in the BM system. The less SMP release had advantage to the stable operation of the bacterial-microalgal consortium. Hence, the bacterial-microalgal consortium contributed to a much stable micro-ecological environment formation for enhancing the high salinity mariculture wastewater treatment performance © 2021

关键词： Microalgae

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Marine Predator Algorithm-based Sliding Mode Control of a Novel Motion Simulator for High Column Sloshing Experiments

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船舶力学 2024年第12期28卷 1835-1848页

作者： DU Zun-feng CHEN Xiang-yu BAI Hao ZHU Hai-ming HAN Mu-xuan State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation School of Civil EngineeringTianjin UniversityTianjin 300350China Power China Northwest Engineering Corporation Limited Xi’an 710065China Nanhai Engineering Branch CNOOC Energy Development Equipment Technology Co.Ltd.Zhanjiang 524057China

Sloshing experiment is crucial to determine the reaction performance of regeneration columns on an offshore floating platform.A novel type of column motion simulating device and a Marine Predator Algorithm-based Sliding Mode Controller(MPA-SMC)are proposed for such sloshing *** simulator consists of a Stewart platform and a steel *** Stewart platform is located at the column's center of gravity(CoG)and supported by the steel *** platform's hydraulic servo system is controlled by a sliding mode controller with parameters optimized by MPA to improve robustness and precision.A numerical sloshing experiment is conducted using the proposed device and *** results show that the novel motion simulator has lower torque during the column sloshes,and the proposed controller performs better than a well-tuned PID controller in terms of target tracking precision and anti-interference capability.

关键词： regeneration column sloshing experiment motion simulator Stewart platform sliding mode control marine predator algorithm

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Desalination of Highly-Mineralized Mine Water Using MoS2/CP@Al and AC@Al CDI 4

Desalination of Highly-Mineralized Mine Water Using MoS2/CP@...

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4th International Conference on Green Energy, Environment and Sustainable Development, GEESD 2023

作者： Wei, Benlong Liu, Bohao Liu, Zhuannian College of Geology and Environment Xi'an University of Science and Technology Shaanxi Xi'an710054 China Department of Civil Engineering Construction Management and Environmental Engineering Northern Arizona University FlagstaffAZ15600 United States

ISBN: (纸本)9781643684260

The desalination of highly-mineralized mine water exists problems of complex processes and high operating costs. In order to simplify the treatment procedures and enhance the desalination efficiency, this study adopted MoS2/CP@Al composite as cathode and AC@Al as an anode to assemble CDI cell for deionization. Under the optimum condition of 1.8 V applied voltage, 1 mm electrode distance and flow rate for 5 mL min-1, the rate of desalination of highly-mineralized mine water could reach 72.6%. Additionally, the research on the deionization mechanism found that MoS2/CP@Al electrode stored cations through reversible ion intercalation. © 2023 IOS Press BV. All rights reserved.

关键词： Molybdenum compounds

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A critical appraisal of recent research in multi-domain indoor-environmental exposure 18

A critical appraisal of recent research in multi-domain indo...

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18th Healthy Buildings Europe Conference 2023: Beyond Disciplinary Boundaries

作者： Mahdavi, Ardeshir Berger, Christiane Institute of Building Physics Services and Construction Faculty of Civil Engineering Sciences Graz University of Technology Graz Austria Department of Architecture Design and Media Technology Aalborg University Aalborg Denmark

ISBN: (纸本)9781713877158

The insufficient availability of evidence-based guidance in practical treatment of multi-domain exposure situations in indoor environments has motivated multiple efforts to conceive and conduct studies on the combined effects of multiple factors on occupants' perception and evaluation of indoor-environmental quality. However, the research strategies that are being currently considered and in part implemented for this purpose may be subject to certain simplifications and misconceptions that would limit their ultimate conclusiveness and utility. The present discussion intends to highlight a number of such issues and encourage thus efforts toward a more robust framework for conducting research and developing standards regarding multi-domain exposure patterns in indoor environments and their implications for occupants' health and comfort. © Healthy Buildings Europe 2023. All rights reserved.

关键词： Architectural design

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Evaluation of Fatigue Properties of Mixed Asphalt Based on Linear Amplitude Scanning Test

Evaluation of Fatigue Properties of Mixed Asphalt Based on L...

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2023 International Conference on Applied Mechanics, Materials Physics, and engineering Structures, MMPES 2023

作者： Shen, Shun Liu, Fuming Su, Heng Peng, Jiayuan School of Civil and Architectural Engineering Nanchang Institute of Technology Nanchang330099 China Jiangxi Yichun Highway Construction Group Co. LTD 336099 China

In order to study the effects of asphalt regenerators on the fatigue properties of mixed asphalt, linear amplitude scanning (LAS) test was designed and four types of regenerators (non-petroleum regenerators NRA and NRB, petroleum regenerators PR and bio-oil based regenerators BR) were mixed. The VECD theory analysis method was used to evaluate the miscible asphalt with different regeneration agents, different new asphalt and different old asphalt. The results showed that: In the process of asphalt regeneration, the peak value of the stress-strain curve will move to the lower right corner. The fatigue factor in the fatigue damage curve decreases slowly with the increase of the internal damage coefficient as the degree of asphalt aging increases. The stress sensitivity of SBS modified asphalt is lower than that of matrix asphalt, and the strain range of LAS test involving modified asphalt needs to be expanded. It can be seen that NRA is the best, BR is the second, NRA and PR are poor. © Published under licence by IOP Publishing Ltd.

关键词： Stress-strain curves

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