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Mechanical Properties of Moso Bamboo Connections with External Clamp Steel Plates

Journal of Renewable Materials 2022年第2期10卷 487-510页

作者： Shidong Nie Song Ran Di Wu Jieyu Chen Hui Wang Qike Wei Key Laboratory of New Technology for Construction of Cities in Mountain Area(Chongqing University) Ministry of EducationChongqing400045China School of Civil Engineering Chongqing UniversityChongqing400045China Suzhou Newcity Investment and Development Co. Ltd.SuzhouChina China Metallurgical Construction Engineering Group Co. Ltd.ChongqingChina

The Moso bamboo,a renewable green building material used in various new green buildings,have received exten-sive attention with the promotion of the concept of green *** explore the mechanical properties of Moso bamboo connections with external clamp steel plates,the 16 specimens were designed by changing the bolt diameters and the end distances of the bolt *** static tension tests were conducted to investigate bearing capacities and failure modes of different connection *** on test results,three failure modes of these connections were obtained,including the shear failure of bolt shank,bearing failure of bolt hole and punch-ing shear failure of the Moso *** influence of bolt diameters and end distances of bolt holes on bearing capacities of the connections was quantitatively *** on a simplified mechanical model,the analytical models were deduced for the bolt shear failure and the bearing failure of bolt *** results showed that the predictive values are in substantial agreement with the experimental ***,the design and manufacturing suggestions are recommended for this Moso bamboo connections.

关键词： Moso bamboo connections external clamp steel plates load-carrying capacities failure modes the 5%d offset method mechanical model

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A scientometric research and critical analysis of road-rail bridge 65

A scientometric research and critical analysis of road-rail ...

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65th International Conference on Vibroengineering

作者： Yao, Gang Wu, Linjun Yang, Yang Zheng, Yuanlin Qin, Bin Chen, Yuxiao School of Civil Engineering Key Laboratory of New Technology for Construction of Cities in Mountain Area Chongqing University Chongqing400045 China Chongqing City Infrastructure Construction Investment Co. Ltd. Chongqing400045 China

With the progress of society and the development of science and technology, the development of transportation is particularly important. Therefore, the road-rail bridge has rapidly developed. We searched the relevant literature from 2002 to 2022 in the Web of Science database in order to objectively understand the research status and development trend of road-rail bridges. We use bibliometric analysis methods to analyze the year of publication, number of publications, distribution of academic journals, research institutions, application fields, analysis theories, test methods and influencing factors in the field of road-rail bridges. Using Citespace software, we analyzed 184 research articles related to road-rail bridges. Copyright © 2023 Gang Yao, et al.

关键词： Roads and streets

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Research on Quality Management and Countermeasures of Fabricated Building construction Based on SWOT Theory

Research on Quality Management and Countermeasures of Fabric...

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2022 International Conference on Algorithms, Network and Computer technology, ICANCT 2022

作者： Gao, Jia Zhu, Jiwei Wang, Xin Zhao, Jie Xi'an University of Technology School of Civil Engineering and Architecture Shaanxi Xi'an710048 China China Railway 12th Bureau Construction and Installation Engineering Co. Ltd. Shaanxi Taiyuan030000 China

With the rapid development of science and technology, the construction industry is showing the trend of informatization. BIM has emerged to bring vitality into the construction industry. This paper introduces the application of BIM software in various phases and the mainstream BIM software at home and abroad, and conducts a comparative study on each BIM software from the design phase, construction phase and operation and maintenance phase, analyses the advantages and disadvantages of each software, and helps relevant practitioners to quickly choose the appropriate software according to their needs. © 2023 Institute of Physics Publishing. All rights reserved.

关键词： Quality management

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Inspection Data Exchange and Visualization for Building Maintenance using AR-enabled BIM 39

Inspection Data Exchange and Visualization for Building Main...

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39th International Symposium on Automation and Robotics in construction, ISARC 2022

作者： Park, J. Chang, S. Lee, H. Cho, Y.K. School of Civil and Environmental Engineering Georgia Institute of Technology United States School of Construction Management Technology Purdue University United States Construction Technology Department BRICON LAB Korea Republic of

ISBN: (纸本)9789526952420

After the COVID-19 outbreak, a new concept of building maintenance (BM) systems is needed because current approaches highly rely on physical contact between workers, engineers, and managers. It imposes health and safety risks as increasing concerns about infections and spreads. This adds burdens to take unavoidable close contact and health risks to building owners, occupants, workforce, and society at large. In this respect, a new BM system was developed that enables reliable virtual communication and reduces BM response times by filling gaps between users and building managers. The proposed system is based on a concept of a cyber-physical system (CPS) using augmented reality (AR) and building information modeling (BIM) to promote non-contact building management. In this system, AR plays an important role in inspecting and visualizing defects in the real world, and the detected defect information is stored and managed by cloud-based BIM in cyberspace. This paper focuses on data visualization and management in the CPS-based non-contact building management system. A cloud-based database and mobile application are developed for data management purposes. In addition, this paper presents BIM data exchange and visualization in AR applications. Target image-based localization and tracking in BIM are also tested. The test results showed that the model alignment and localization accuracy are reliable for building maintenance works. Using the new BM mechanism, we expect that the related workers, building owners, and occupants will experience a reliable building maintenance process based on CPS-based information exchange from both users and facility managers while maintaining social distance. © 2022 International Association on Automation and Robotics in construction.

关键词： Augmented reality

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Strength and Durability Evaluation of Bacteria-Based Self-Healing Concrete

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Iranian Journal of Science and technology - Transactions of civil engineering 2025年 1-13页

作者： Zamba, Duresa Dubale Mohammed, Tesfaye Alemu Getu, Yiglet Mebrat Tufa, Dereje Hailu Civil Engineering Department Addis Ababa Science and Technology University Addis Ababa Ethiopia Construction Quality and Technology Center of Excellence Addis Ababa Science and Technology University Addis Ababa Ethiopia Medical Biochemistry Ethiopian Biodiversity Institute Addis Ababa Ethiopia Molecular Biology Ethiopian Biodiversity Institute Addis Ababa Ethiopia

Concrete is susceptible to cracking under tension, which can lead to structural deterioration due to the penetration of acidic solutions and chemicals. Self-healing concrete presents an innovative solution by autonomously repairing surface cracks, reducing the need for costly and time-consuming maintenance. This study investigates the potential of Bacillus cereus in enhancing the self-healing and durability properties of C25-grade concrete. B. Cereus bacteria (10⁸ cells/ml) were utilized, and mechanical tests were conducted on both bacterial and control concrete specimens. Six pre-cracked samples from each group were monitored using a 3D optical microscope, and over 60 specimens were tested after 56 days of curing. Results showed that after 28 days, bacterial concrete exhibited increased compressive strength (16.67%), and flexural strength (8.59%) compared to control concrete. After 56 days, acid and salt resistance improved by 5.51% and 7.28%, respectively. Bacterial concrete also demonstrated 28.99% lower water absorption. The addition of bacteria resulted in a regain of compressive strength (17.88%, 5.29%, and 3.63% at 50%, 80%, and 100% loading, respectively) after 28 days. Analysis with a 3D microscope revealed increased white crystal precipitates, indicating effective crack filling facilitated by B. Cereus bacteria and calcite precipitation. These findings demonstrate that B. Cereus-based self-healing concrete enhances mechanical strength and durability, offering a sustainable and cost-effective alternative for resilient infrastructure. This novel technology holds significant potential for extending the lifespan of concrete structures and reducing maintenance demands. © The Author(s), under exclusive licence to Shiraz University 2025.

关键词： Bacillus cereus Bacteria-based Durability Mechanical strength Self-healing concrete

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Research on optimization and Simulation of Fire Emergency Evacuation Path Based on Improved Ant Colony Algorithm for Large Public Buildings 8

Research on optimization and Simulation of Fire Emergency Ev...

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8th International Conference on Computational Intelligence and Applications, ICCIA 2023

作者： Jia, Shilong Zhao, Lei Yang, Dong Sun, Lei Liang, Bo Shenyang Architecture University School of Civil Engineering Shenyang China Education Technology Co. Ltd Shenzhen Yangwang Future Shenzhen China Construction Eighth Engineering Bureau Co. Ltd Northeast Branch of China Shenyang China North Branch of China Construction Eighth Engineering Bureau Co. Ltd Baoding China

ISBN: (纸本)9798350339741

Starting from the ant colony algorithm and introducing heuristic functions, node selection strategies, and pheromone updates to improve the ant colony algorithm and make it provide a scientific basis for evacuation after a fire. The ant colony algorithm is improved to make it more suitable for the path optimization of emergency evacuation in large public buildings. The improved ant colony algorithm is used to solve the case, and the superiority of the improved ant colony algorithm and the feasibility of the path optimization algorithm are verified. Under the guidance of the improved ant colony algorithm, the evacuation path was visualized by programming with unity3D. © 2023 IEEE.

关键词： Heuristic algorithms

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Performance evaluation of alkali activated slag based recycled aggregate pervious concrete

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Materials Today: Proceedings 2023年

作者： Basavana Gowda, S.N. Kumar Goudar, Sharan Thanu, H.P. Monisha, B. Department of Civil Engineering Bapuji Institute of Engineering and Technology Davanagere India Department of Civil Engineering National Institute of Technology Calicut India Department of Construction Technology and Management JSS Science and Technology University Mysuru India

The present study attempts, a detailed evaluation of the strength performance of Alkali Activated Slag based Pervious Concrete (AASPC) mixes, containing fly ash and ground granulated blast furnace slag (GGBS) as binders. Fly ash and GGBS, by-product obtained from thermal power plants and steel industries respectively, is incorporated in the AASPC mixes as a full replacement to ordinary Portland cement (OPC). Initially OPC and AASPC mixes are designed to obtain M30 grade. OPC based pervious concrete is considered as control concrete. Pervious concrete is a type of concrete that has a high-water permeability and a higher void content than regular concrete. Experiments investigates the effect of the addition of Recycled Coarse Aggregate (RCA) on the physical and mechanical properties of alkali activated pervious concrete. Certain physical test has been conducted on recycled coarse aggregate to check the quality of aggregates, RCA varying percentage in 0, 25, 50, 75 and 100%, in the mixes. All mixes of alkali activated pervious concrete includes 50% of GGBS and 50% of fly ash from total binder content. Alkali activators used are, sodium hydroxide pellets and sodium silicate liquid. Workability of the alkali activated pervious concrete has a low slump value compare to the control concrete, but the workability of pervious concrete with cement is equal to alkali activated pervious concrete and workability will decreases with increase in RCA percentage because has a high capacity of water absorption. Compressive strength of alkali activated pervious concrete has increased by 23% compared to the OPC based pervious concrete and then there will be a decrease in compressive strength with increase in RCA percentage. The flexural strength and split tensile strength results for both the alkali activated pervious concrete and OPC based concrete shows almost similar values. Permeability and void ratio results shown increase with increase in RCA percentage in AASPC. © 2024 Elsevier L

关键词： Compressive strength

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Borehole reinforcement based on polymer materials induced by liquid-gas phase transition in simulating lunar coring

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International Journal of Mining Science and technology 2025年第3期35卷 383-398页

作者： Dingqiang Mo Tao Liu Zhiyu Zhao Liangyu Zhu Dongsheng Yang Yifan Wu Cheng Lan Wenchuan Jiang Heping Xie State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing 400044China Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization College of Civil and Transportation EngineeringShenzhen UniversityShenzhen 518060China Institute of New Energy and Low-Carbon Technology Sichuan UniversityChengdu 610065China State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering Sichuan UniversityChengdu 610065China College of Polymer Science and Engineering Sichuan UniversityChengdu 610065China Shenzhen Key Laboratory of Deep Engineering Science and Green Energy Institute of Deep Earth Sciences and Green EnergyShenzhen UniversityShenzhen 518060China

Lunar core samples are the key materials for accurately assessing and developing lunar ***,the difficulty of maintaining borehole stability in the lunar coring process limits the depth of lunar ***,a strategy of using a reinforcement fluid that undergoes a phase transition spontaneously in a vacuum environment to reinforce the borehole is *** on this strategy,a reinforcement liquid suitable for a wide temperature range and a high vacuum environment was developed.A feasibility study on reinforcing the borehole with the reinforcement liquid was carried out,and it is found that the cohesion of the simulated lunar soil can be increased from 2 to 800 kPa after using the reinforcement ***,a series of coring experiments are conducted using a selfdeveloped high vacuum(vacuum degree of 5 Pa)and low-temperature(between-30 and 50℃)simulation *** is confirmed that the high-boiling-point reinforcement liquid pre-placed in the drill pipe can be released spontaneously during the drilling process and finally complete the reinforcement of the *** reinforcement effect of the borehole is better when the solute concentration is between0.15 and 0.25 g/mL.

关键词： Lunar coring Reinforcement fluid Borehole reinforcement Drill bit cooling

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Effect of elevated temperature on the mechanical properties of geopolymer concrete: a critical review

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Discover civil engineering 2024年第1期1卷 1-12页

作者： Rihan, Mohammed Ali M. Onchiri, Richard Ocharo Gathimba, Naftary Sabuni, Bernadette Pan African University Institute for Basic Sciences Technology and Innovation Hosted at the Jomo Kenyatta University of Agriculture and Technology Nairobi Kenya Civil Engineering Department Faculty of Engineering University of Kordofan El Obeid Sudan Department of Building and Civil Engineering Technical University of Mombasa (TUM) Mombasa Kenya Department of Civil Construction and Environmental Engineering Jomo Kenyatta University of Agriculture and Technology Juja Kenya Department of Civil and Structural Engineering Masinde Muliro University of Science and Technology Kakamega Kenya

The need for concrete is increasing exponentially due to the growing population and fast urbanization. The primary constituent in concrete is ordinary Portland cement (OPC). Producing cement involves a significant quantity of embodied energy and leads to the release of greenhouse gases. Geopolymer concrete (GPC) was created to address the adverse environmental effects of carbon dioxide emissions (CO2) and the overdependence on fossil fuels in cement production. In addition to reducing environmental consequences, geopolymer concrete shows outstanding resistance to higher temperatures compared to OPC concrete, which maintains temperatures up to 1200 °C. This review investigates the field of GPC, focusing on its ability to withstand high temperatures. It briefly reviews geopolymer concrete's mechanical properties at high temperatures. It has been observed that residual compressive strength, which is essential in high-temperature GPC studies, generally increases to 150–350 °C but decreases beyond 400 °C because of microcrack formation. Moreover, enhanced tensile strength is demonstrated up to 300 °C, with a noticeable decrease above 800 °C. This study emphasizes the potential of geopolymer concrete for improving fire protection measures in the building industry.

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Influence of sodium hydroxide (NaOH) molarity on fresh properties of self-compacting slag-based geopolymer concrete containing recycled aggregate

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Materials Today: Proceedings 2022年 56卷 1733-1737页

作者： Younis, Khaleel H. Department of Surveying and Road Construction Erbil Technology College Erbil Polytechnic University Erbil Iraq Civil Engnieering Department College of Engineering Tishk International University Erbil Iraq

The present study is an attempt to examine the feasibility of developing a sustainable self-compacting concrete (SCC) made with geoploymer binder and recycled aggregate. The study explores the effects of four sodium hydroxide (SH) molarities (8 M, 10 M, 12 M and 14 M) on the fresh properties of self-compacting slag-based geopolymer concrete. Eight slag-based geopolymer concrete mixtures were examined. These mixes are divided into two groups: GPN group in which the mixtures are made with natural aggregate (NA) and GPR group in which the mixtures are made with recycled aggregate (RA). Each group includes four mixes made with the four mentioned SH molarities. The mixtures were examined for its flowability, passing ability, viscosity and segregation resistance and the results were tested against the EFNARC recommendations for SCC. It was concluded that recycled aggregate and the molarity of sodium hydroxide affects the fresh properties of SCC. But, developing self-compacting slag-based geopolymer concrete that meets the limits of EFNARC is feasible. © 2021

关键词： Sodium hydroxide

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