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Influence of pier height on the safety of trains running on high-speed railway bridges during earthquakes

Journal of Central South University 2024年第6期31卷 2102-2115页

作者： NIE Yu-tao GUO Wei JIANG Li-zhong YU Zhi-wu ZENG Chen WANG Yang HE Xu-en REN Shao-xun HUANG Ren-qiang LIANG Guang-yue LI Chang-qing School of Civil Engineering Central South UniversityChangsha 410075China National Engineering Research Center of High-speed Railway Construction Technology Central South UniversityChangsha 410075China

Sudden earthquakes pose a threat to the running safety of trains on high-speed railway bridges,and the stiffness of piers is one of the factors affecting the dynamic response of train-track-bridge *** this paper,a experiment of a train running on a high-speed railway bridge is performed based on a dynamic experiment system,and the corresponding numerical model is *** reliability of the numerical model is verified by ***,the experiment and numerical data are analyzed to reveal the pier height effects on the running safety of trains on *** results show that when the pier height changes,the frequency of the bridge below the 30 m pier height changes greater;the increase of pier height causes the transverse fundamental frequency of the bridge close to that of the train,and the shaking angle and lateral displacement of the train are the largest for bridge with 50 m pier,which increases the risk of derailment;with the pier height increases from 8 m to 50 m,the derailment coefficient obtained by numerical simulations increases by 75% on average,and the spectral intensity obtained by experiments increases by 120% on average,two indicators exhibit logarithmic variation.

关键词： pier height high-speed railway bridge running safety numerical model

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Comparative Analysis of Human Traits and Tendencies: General vs. Specialty Contractor Project Managers

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International Journal of construction Education and Research 2024年第3期20卷 284-300页

作者： Kassa, Rebecca Ogundare, Tolulope Ibilola Lines, Brian Smithwick, Jake Sullivan, Kenneth Department of Civil Environmental and Architectural Engineering University of Kansas KS United States Department of Engineering Technology and Construction Management University of North Carolina at Charlotte Charlotte NC United States School of Sustainable Engineering and Built Environment Arizona State University Tempe AZ United States

construction project managers (PMs) are critical team players in safeguarding project success. construction organizations heavily rely on their PMs to inspire and motivate their teams to accomplish projects. However, labor turnover, changing demographics, and a shortage of skilled talent are common challenges in the industry. PMs transition between jobs in search of better opportunities. Labor turnover distresses project success, pressurizes team performance, and reduces organizational profitability. This study proposes using human traits assessments to evaluate the variations between job roles in construction. Understanding this sets a more positive work environment and improves teamwork, communication, and employee retention techniques. In assessing the differences between general contractor project managers (GC PMs) and specialty contractor project managers (specialty PMs), this study found that the traits and characteristics of individuals working in different roles can vary considerably. Significant differences in personality characteristics, emotional intelligence, and behavioral traits were identified. construction companies may use human traits assessments to aid employee retention and talent development. Employees can better comprehend their work environments and smoothly transfer between roles in the industry as they learn the demands of the different job roles. © 2023 Associated Schools of construction.

关键词： behavior emotional intelligence human traits personality Project manager

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A comparative study on liquefaction assessment of Rajarhat area of Kolkata by using different approaches 5th

A comparative study on liquefaction assessment of Rajarhat a...

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5th International Symposium on Cone Penetration Testing, CPT 2022

作者： Halder, Abhipriya Das, Kaustav Nandi, Saptarshi Bandyopadhyay, Kaushik Department of Civil Engineering Narula Institute of Technology India Department of Construction Engineering Jadavpur University India

ISBN: (纸本)9781032312590

Liquefaction potential assessment is of particular significance to geotechnical engineers in order to evaluate the risks for construction of high rise buildings, railway embankments, canal, road embankments, earth dams etc. in areas susceptible to liquefaction. Investigations were made at Rajarhat area of Kolkata, India by means of CPT, DMT, SPT and SDMT measurements. The main purpose of carrying out these tests is to grab a relatively rare opportunity to compare the results of all these methods for arriving at a conclusive evidence in predicting liquefaction. It was found that the results of all the in-situ techniques were relatively consistent in predicting liquefaction within a depth range of 0 to 17.0 m below the ground surface. CPT, DMT, SPT and SDMT are basically field-based in-situ tests for measurements of important geotechnical parameters and also provide reliable data for assessment of liquefaction potential of a site. In recent times Finite Element Method based (FEM), a powerful viable alternative tool is available to the geotechnical engineers for application in various fields. In the present investigation, an attempt has been made to study the assessment of liquefaction based on the numerical simulation using Finite element software in addition to all the field techniques mentioned before. The main objective of the present study is to evaluate the correlation between factor of safety against liquefaction using different in-situ test approaches as well as the FEM tool. Finally, the paper presents the correlation between the depth and factor of safety for this particular Rajarhat area of Kolkata for understanding the vulnerability of this area to liquefaction. © 2022 the Author(s).

关键词： Finite element method

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Two-year growth of Deep Underground Science and engineering: A perspective

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Deep Underground Science and engineering 2024年第4期3卷 383-384页

作者： Jianguo Wang Chunfai Leung Heping Xie Xiaozhao Li Na Yue Qingping Hou Jihong Wang School of Mechanics and Civil Engineering China University of Mining and TechnologyXuzhouChina Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province School of Civil EngineeringShaoxing UniversityShaoxingChina Center for Offshore Research and Engineering National University of SingaporeSingapore Institute of Deep Earth Sciences and Green Energy Shenzhen UniversityShenzhenChina College of Water Resource and Hydropower Sichuan UniversityChengduChina State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering China University of Mining and TechnologyXuzhouChina Editorial Office of Deep Underground Science and Engineering China University of Mining and TechnologyXuzhouChina

Deep Underground Science and engineering(DUSE)launched its first issue in September 2022 as a quarterly *** far,it has published 106 articles with nine issues and online early *** volume of received manuscripts increases by 50%each year and over 200 manuscripts were received by 28th of November *** the early period,DUSE authorship came from five countries and now reaches 29 *** articles have been downloaded over 97000 times by readers from 170 countries/*** is indeed encouraging to note that DUSE has been admitted to different indices,including ESCI(August 2024),EI(March 2024),Scopus(July 2023),and DOAJ(May 2023).Its CiteScore in Scopus was 2.2 in 2023 and increased to 5.1 at the mid-November *** first impact factor from the Web of Science will be available in *** is growing to be a rapidly recognized international journal by readers in deep underground research and practice.

关键词： journal admitted underground

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Seeking the adsorption of tetracycline in water by Fe-modified sludge biochar at different pyrolysis temperatures

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Environmental Science and Pollution Research 2024年第25期31卷 36702-36715页

作者： Jin, Hanyu Song, Zhongxian Luo, Yulong Mao, Yanli Yan, Qun Huang, Zhenzhen Kang, Haiyan Yan, Xu Xing, Jiajing Wu, Yongle Henan University of Urban Construction Henan Key Laboratory of Water Pollution Control and Rehabilitation Technology Pingdingshan467000 China School of Civil and Surveying Engineering Jiangxi University of Science and Technology Ganzhou341000 China Faculty of Innovation and Design City University of Macao 999078 China

The composite material SBC-Fe-x with sludge and Fe3+ was developed by different calcination temperatures (600, 700, and 800 °C) for the removal of tetracycline (TC). The adsorption rates of SBC-Fe-600, SBC-Fe-700, and SBC-Fe-800 were 77.5%, 89%, and 91%, respectively. Furthermore, the Langmuir model indicated that the maximum adsorption capacity of SBC-Fe-700 (157.93 mg/g) was three times greater than that of SBC-Fe-600. The conclusions were confirmed by a series of characterizations that SBC-Fe-700 showed a larger specific surface area, well-developed pore structure, rich oxygen-containing functional groups and a high degree of graphitization. The results of pH experiments indicated the broad applicability of SBC-Fe-700 for TC adsorption. In addition, SBC-Fe-700 suggested outstanding performance in different water environments. This work produced a feasible adsorbent for the removal of TC, and a new direction for sludge resource utilization was proposed. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Carbon

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Effect of Curing Conditions on the Mechanical Properties and Permeability of Concrete Incorporating Sulfate-Resistant Admixture 3rd

Effect of Curing Conditions on the Mechanical Properties and...

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3rd International Conference on Structural Health Monitoring and engineering Structures, SHM and ES 2023

作者： Dang, Bao-Loi Doan, Long The Van Hai, Nguyen Phan, Duy Nguyen Nguyen-Xuan, Hung Dang, Viet Quoc Faculty of Civil Engineering Mientrung University of Civil Engineering Tuy Hoa City Viet Nam Quality Management Department of Transport Construction Phu Yen Department of Transportation Tuy Hoa City Viet Nam Faculty of Civil Engineering School of Technology Van Lang University Ho Chi Minh City Viet Nam CIRTech Institute HUTECH University Ho Chi Minh City Viet Nam Faculty of Infrastructural Engineering-Technology Mientrung University of Civil Engineering Tuy Hoa City Viet Nam

ISBN: (纸本)9789819703982

Concrete needs an adequate time and proper curing condition to reach its potential strength and durability. Curing is a vital procedure that keeps concrete at a sufficient moisture content and temperature throughout the hydration of the cementitious material, allowing the required qualities of concrete to develop. This paper presents an experimental investigation on the influence of different curing conditions, i.e., drying, water, and curing with seawater on the mechanical properties and permeability of concrete containing a sulfate-resistant admixture up to an age of 28 days. Two concrete mixtures with and without sulfate-resistant admixture were prepared with a constant water-to-cement ratio of about 0.37. It has been found that the inclusion of the sulfate-resistant admixture is effective in enhancing the compressive and splitting tensile strengths as well as the impermeability of concrete at 28 days, regardless of the curing conditions. Additionally, the results suggest that the concrete should be cured by immersion in water for up to 28 days, rather than other curing conditions, in order to obtain the best performance before being exposed to other environments such as drying or marine environments. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Sulfur compounds

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Surface water treatment using Acanthus sennii stem

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International Journal of Energy and Water Resources 2024年第4期8卷 451-460页

作者： Alemu, S.G. Bulcha, A.T. Ayele, A.T. Yirdaw, A.D. Wasie, A.M. Leta, M.K. Geleta, D. Sime, C.H. Ethiopian Construction Design and Supervision Works Corporation (ECDSWC) Addis Ababa Ethiopia Oda Bultum University Institute of Technology Chiro Ethiopia Engineering Corporation of Oromia (ECO) Addis Ababa Ethiopia Jimma University Institute of Technology Faculty of Civil and Environmental Engineering Jimma Ethiopia

Surface water is prone to pollution from diverse pollutants and necessitates treatment processes before it can be safely utilized as drinking water. Its treatment involves the use of various synthetic compounds, both organic and inorganic in nature. However, using organic and inorganic compounds is prohibitively expensive for rural area communities in developing countries. As a result, the goal of this research is to treat surface water with a natural coagulant, the Acanthus sennii stem. Acanthus sennii stem is a type of plant traditionally used as a natural coagulant and medicine in rural area communities. To identify the performance of this plant in surface water treatment, a stem sample of the A. sennii was taken and processed as a paste for laboratory use. Sample water with initial turbidity of 173 Nephelometric Turbidity Units (NTU) was collected and divided into five 500 mL beakers. Then, dosages of A. sennii stem coagulant (3 g, 4 g, 6 g, 13 g, and 20 g) were given to each beaker of sample water, and a coagulation–flocculation test was done in a jar at room temperature. Turbidity removal, total coliform reduction, and color removal effectiveness of the 3 g dosage added to 500 mL were 97.45%, 95.34%, and 94.67%, respectively. The coagulant also lowered the sample water total dissolved solids and conductivity. The dosage of 3 g per 500 mL of raw water was the optimum dosage. Based on this laboratory analysis, A. sennii plant can be used as a natural coagulant. © The Author(s), under exclusive licence to Iranian Society of Environmentalists (IRSEN) and Science and Research Branch, Islamic Azad University 2023.

关键词： Acanthus sennii Natural coagulant Surface water purification Water treatment

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Removal of heavy metals from contaminated foundry sand through repeated soil-washing

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International Journal of Sustainable engineering 2021年第1期14卷 39-45页

作者： Imteaz, Monzur Alam Arulrajah, Arul Department of Civil and Construction Engineering Swinburne University of Technology Melbourne Australia

This paper presents investigations on the effectiveness of repeated washing in removing heavy metals from contaminated Foundry Sand (FS) sample collected from a recycling company in Melbourne. It is found that after repeated wash-offs, concentrations of heavy metals reduce significantly and these reductions for all the tested metals follow logarithmic trends. Results are compared with other contemporary findings on the physical separation of heavy metals from contaminated soil. Also, it is observed that higher the concentration of metals found in the initial leaching solution, higher the rate of reduction of concentration in subsequent leaching. Using logarithmic relationship, best-fit equations for the reductions of heavy metals’ concentrations through repeated wash-offs were derived. Using such equations, it is possible to work out a number of washing cycles required for a particular heavy metal to wash it up to the requirement of any particular regulatory authority. In regards to the effect of soil depth on accumulated pollutants’ concentrations, it is found that the concentrations of heavy metals in the leachate linearly vary with the depth of FS column used for testing. © 2019 Informa UK Limited, trading as Taylor & Francis Group.

关键词： Heavy metals

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Standard Components Query System Based on Logical Filtering and Semantic Retrieval 8th

Standard Components Query System Based on Logical Filtering ...

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8th International Conference on Advances in construction Machinery and Vehicle engineering, ICACMVE 2023

作者： Huang, Ziyan Bian, Yongming Yang, Meng School of Mechanical Engineering Tongji University Shanghai201804 China National Engineering Technology Research Center for Prefabrication Construction in Civil Engineering Tongji University Shanghai200092 China Shanghai Engineering Research Center for Safety Intelligent Control of Building Machinery Shanghai200032 China

ISBN: (纸本)9789819718757

The establishment of a robust standard components database is essential in various industries to streamline product development and ensure quality. This paper presents a system for querying standard components data, leveraging the power of logical filtering and semantic retrieval. The structured approach of this system includes a well-defined database structure, logical filtering capabilities at different data levels, and advanced semantic retrieval techniques. The outputs of the system demonstrate its effectiveness in handling user queries, analysing unstructured data, and providing meaningful feedback based on logical filtering outcomes. This research contributes to the efficient utilization of standard components data through an innovative and powerful digital query system. © The Author(s) 2024.

关键词： Search engines

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High-strength high-performance concrete incorporating different macro fiber types and contents: engineering and durability performance

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Journal of the Chinese Institute of Engineers, Transactions of the Chinese Institute of Engineers,Series A 2024年第1期47卷 81-95页

作者： Vu, Viet-Hung Nguyen, Minh-Hieu Hwang, Chao-Lung Huynh, Trong-Phuoc Campus in Ho Chi Minh City University of Transport and Communications Ho Chi Minh City Viet Nam Vinh Long Department of Construction Vinh Long Viet Nam Taiwan Building Technology Center National Taiwan University of Science and Technology Taipei Taiwan Faculty of Civil Engineering College of Engineering Can Tho University Can Tho Viet Nam

Generating a synergistic response by combining the advantages of different fiber types in concrete is of current scholarly interest. This study investigated the effects of different hooked-end steel fiber (SF) volume fractions up to 1.6% and three macro fiber types including polypropylene (PP), SF, and typical hybrid fibers (HF: 50% SF + 50% PP) at a fixed dosage of 1.6% on properties of high-strength high-performance concrete (HSHPC). A novel densified mixture design algorithm was used to incorporate a high quantity of fly ash and rice husk ash as an eco-binder. Results showed the specimens with added macro SF exhibited improved mechanical strength, dynamic modulus of elasticity and rigidity, and lower drying shrinkage while the ones with added PP exhibited reductions in compressive strength and dynamic modulus. Interestingly, the incorporation of macro fibers, regardless of fiber type and content, reduced electrical resistivity, ultrasonic pulse velocity and increased the total charge passed in the chloride ion penetration test, resulting in likely underestimation of the reinforcement corrosion resistance, especially for SF specimens. The findings also confirm that HF demonstrating synergistic response may be effective and creative in improving most of the concrete characteristics, contributing to the efficient use of HSHPC in real-world structures. © 2023 The Chinese Institute of Engineers.

关键词： Steel fibers

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