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Employee Perceptions of the COVID-19 Pandemic Management in construction Sector: A Survey-Based Study of Bangladesh

Journal of Operations and Strategic Planning 2023年第1期6卷 7 - 27页

作者： Showaib Ahmed Chowdhury Shahrin Islam Department of Building Engineering and Construction Management Rajshahi University of Engineering and Technology (RUET) Rajshahi Bangladesh Department of Civil Engineering Daffodil International University (DIU) Dhaka Birulia Bangladesh

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Semiarid Terrain Alteration for Converting Dryland into Arable Land - construction and Earthmoving Perspectives 39

Semiarid Terrain Alteration for Converting Dryland into Arab...

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

作者： Alamaro, M. Louis, J. Teizer, J. Department Earth Atmospheric and Planetary Sciences Massachusetts Institute of Technology United States School of Civil and Construction Engineering Oregon State University United States Department of Civil and Mechanical Engineering Technical University of Denmark Denmark

ISBN: (纸本)9789526952420

Close to 15% of the world's surface area is semiarid where 1.1 billion of the most vulnerable people on earth live. In contrast to arid, semiarid regions have substantial rainfall albeit it quickly evaporates and therefore vegetation and biomass growth are limited. A new concept calls for terrain alteration by earth moving to construct north-south slopes where on the northern slope in the northern hemisphere solar irradiation is reduced, causing in turn a reduction in evapotranspiration (ET), allowing for cultivation. The dimension of the slopes (or ridges) is on the order of 5-10 meters and its slope angle is in the range of 15-20 degrees. This paper provides the motivation for such development and an overview of the necessary research and development for implementation. It also focuses specifically on the topic of earthmoving operations that are involved, the equipment it requires, and discusses the potential for employing robotics and automated construction methods to improve the economic and environmental feasibility of such an endeavor. © 2022 International Association on Automation and Robotics in construction.

关键词： Cultivation

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Modelling and analysis on bearing capacity of asphalt pavement in dense traffic flow of urban areas

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International Journal of Industrial and Systems engineering 2021年第3期38卷 378-392页

作者： Song, Minglei Liu, Zhongwei School of Civil and Transportation Engineering Henan University of Urban Construction Henan Pingdingshan467036 China School of Mechanical Engineering Hunan University of Technology Zhuzhou412007 China

Aiming at the problems of low fitting degree and high complexity between the research results and the actual situation, the bearing capacity model of asphalt pavement in dense traffic flow area based on combination forecasting is put forward. Cellular automata is used to calculate the relative position and speed change of vehicles in the popularisation process. According to Orkut model, the relative position and speed change of each vehicle on the road is calculated and analysed. Through calculation and analysis, the vehicle load concentration value is obtained. The experimental results show that the SSE, MAE, MSE and complexity coefficient of the bearing capacity model for asphalt pavement in heavy flow area based on combined prediction are lower than 0.05, lower than 0.15, lower than 0.16 and lower than 0.2, which are the minimum values in the comparison method, indicating that the model has high accuracy, low complexity and good reliability. Copyright © 2021 Inderscience Enterprises Ltd.

关键词： Bearing capacity

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TransFlowLog: Log Anomaly Detection Based on Transformer Encoder and Interflow Decoder 29

TransFlowLog: Log Anomaly Detection Based on Transformer Enc...

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29th IEEE International Conference on Parallel and Distributed Systems, ICPADS 2023

作者： Lin, Zaichao Lu, Siyang Han, Ningning Wang, Dongdong Wei, Xiang Wang, Mingquan Beijing Jiaotong University School of Computer and Information Technology Beijing China University of Central Florida Department of Civil Environmental and Construction Engineering OrlandoFL United States Beijing Jiaotong University School of Software Engineering Beijing China China Academy of Launch Vehicle Technology Beijing China

ISBN: (纸本)9798350330717

Logs are valuable resources that record the health status of systems. Analyzing logs to uncover and investigate abnormal behaviors has become an essential approach of ensuring system security. However, some potential anomalies may be missed when performing log anomaly detection, and even a seemingly insignificant abnormal behavior can lead to a series of severe anomalies or continuous negative impact on the performance of systems. Therefore, the reliability and security of systems are facing significant challenges. To address this issue, in this study, we propose TransFlowLog, an Encoder-Decoder architecture-based approach for log anomaly detection. It utilizes the Transformer Encoder, a state-of-the-art sequence modeling technique, to comprehensively understand contextual relationships using self-attention mechanism. Moreover, we introduce the Interflow Decoder, which considers information exchange between channels in embedded log sequences. The Interflow Decoder enhances the features encoded by the Transformer Encoder in both sequence and channel dimensions, thereby capturing interdependence between different channels. Comparative experiments conducted on three real-world datasets demonstrate the effectiveness of the proposed method, as it achieves higher F1-score and reduces the number of false negatives. © 2023 IEEE.

关键词： anomaly detection Encoder-Decoder architecture self-attention systems reliability

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Pressure deviation monitoring and early warning in large integrated tower crane support system for super high-rise buildings

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Measurement: Sensors 2024年 31卷

作者： Pan, Xi Zhao, Tingsheng School of Civil and Hydraulic Engineering Huazhong University of Science and Technology Hubei Wuhan430074 China General Engineering Institute of Shanghai Construction Group Shanghai Construction Group Co. Ltd. Shanghai200080 China

In super high-rise buildings, the integration of large tower cranes with climbing platforms can enhance the construction efficiency. However, this integration mode significantly increases the load on the tower crane support system (TCSS). Current low-precision manual construction methods can lead to uneven pressures at the support points, potentially causing structural damage and serious accidents. This study proposes a method for monitoring, providing warnings, and optimizing deviations in TCSS pressure to ensure safe and controlled operations. Large-load sensors have been developed to monitor the pressure on TCSS in super-high-rise building projects. The pressure tests revealed that the uneven load distributions at the support points differed significantly from the simulation results. The safety of large integrated construction equipment can be ensured by considering the uneven distribution coefficients of the support pressure and improving the design accuracy of the support points. © 2024 The Authors

关键词： Towers

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Operational Modal Analysis and Finite Element Model Updating of a 53-Story Building 39th

Operational Modal Analysis and Finite Element Model Updating...

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39th IMAC, A Conference and Exposition on Structural Dynamics, 2021

作者： Avci, Onur Alkhamis, Khalid Abdeljaber, Osama Hussein, Mohammed Civil Construction and Environmental Engineering Iowa State University AmesIA United States Department of Civil and Architectural Engineering Qatar University Doha Qatar Department of Building Technology Linnaeus University Växjö Sweden

ISBN: (纸本)9783030771423

This paper presents Operational Modal Analysis (OMA) and Finite Element (FE) model updating of a tall structure. Located in the West Bay area of Doha (Qatar), the structure was constructed between 2012 and 2016. It is a reinforced concrete building with shear wall cores located towards the center of the building plan. With 53 stories above the ground and 2 stories below ground, the 230 m (755 ft) tall building is being used for residential and hotel purposes. The material presented here is arguably the first published work on large-scale dynamic testing of a civil structure in Qatar. The wireless sensors used for testing are state-of-the-art equipment that can capture very low frequencies, something that cannot be accomplished with most of the conventional accelerometers available in the market. © 2022, The Society for Experimental Mechanics, Inc.

关键词： Structural dynamics

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Novel dynamic test system for simulating high-speed train moving on bridge under earthquake excitation

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Journal of Central South University 2022年第8期29卷 2485-2501页

作者： LIU Han-yun YU Zhi-wu GUO Wei JIANG Li-zhong School of Civil Engineering Central South UniversityChangsha 410075China National Engineering Research Center of High-Speed Railway Construction Technology Changsha 410075China

China’s high-speed railways are always facing the potential damage risk induced by strong *** the route design concept of“using bridge instead of embankment”has also greatly increased the probability of high speed trains moving on bridges when a strong earthquake *** the past decades,a bunch of theoretical and numerical studies have been conducted in the seismic dynamic field of high-speed ***,the effective dynamic test system for verifying the given method and theoretical results is still ***,a novel dynamic test system(DTS)consisting of a shaking table array and a train-pass-bridge reduced-scale model is proposed in this *** some crucial technical problems discussion,the effectiveness of similar design scheme and the feasibility of reduced-scale DTS are elaborated,and then the detailed DTS structures are given and displayed as *** this basis,the demonstration tests are conducted and compared with the numerical *** results show that the proposed DTS is accurate and ***,the DTS can provide a new physical simulation approach to study the high-speed train’s running safety on bridges under earthquakes and can also provide a reference for the construction of related systems.

关键词： strong earthquake high-speed train shaking table test dynamic test system similar design bridge

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A co-simulation method for the train-track-bridge interaction analysis under earthquake using Simpack and OpenSees

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Journal of Central South University 2022年第8期29卷 2791-2806页

作者： TANG Jian-yuan GUO Wei WANG Yang LI Jun-long ZENG Zhe-feng School of Civil Engineering Central South UniversityChangsha 410075China National Engineering Research Center of High-speed Railway Construction Technology Changsha 410075China

Under high-level earthquakes,bridge piers and bearings are prone to be damaged and the elastoplastic state of bridge structural components is easily accessible in the train-track-bridge interaction(TTBI)*** the complexity and structural non-linearity of the TTBI system under earthquakes,a single software is not adequate for the coupling ***,in this paper,an interactive method for the TTBI system is proposed by combining the multi-body dynamics software Simpack and the seismic simulation software OpenSees based on the Client-Server architecture,which takes full advantages of the powerful wheel-track contact analysis capabilities of Simpack and the sophisticated nonlinear analysis capabilities of *** on the proposed Simpack and OpenSees co-simulating train-track-bridge(SOTTB)method,a single-span bridge analysis under the earthquake was conducted and the accuracy of co-simulation method was verified by comparing it with results of the finite element ***,the TTBI model is built utilizing the SOTTB method to further discuss the running safety of HST on multi-span simply supported bridges under *** results show that the SOTTB method has the advantages of usability,high versatility and accuracy which can be further used to study the running safety of HST under earthquakes with high intensities.

关键词： train-track-bridge system co-simulation SOTTB client-server running safety

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Damage-Controlling Seismic Design of Low- and Mid-Rise RC Buildings Considering Mainshock-Aftershock Sequences

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Structures 2023年 57卷

作者： Nugroho, Lorddy Zefanya Chiu, Chien-Kuo Department of Civil and Construction Engineering National Taiwan University of Science and Technology Taipei City10607 Taiwan

Recently, the modified equivalent linearization method (MELM) is used to estimate the maximum deformation response for a structure under a near-fault or far-fault earthquake. However, most works in which the equivalent linearization method is used consider only one earthquake event. When a reinforced concrete (RC) building structure is damaged by a mainshock, which is the main seismic event of an earthquake, its stiffness and strength are reduced by concrete cracking and rebar yielding and then its period is longer in the sequent seismic events or so-called aftershock. Therefore, for seismic design of low- and mid-rise RC building structures, this work is aim to propose a simplified method that can be used to quantify the damage that is subjected to an MSAS sequence in a near-fault or far-fault earthquake using MELM. Additionally, a formula that can be used to do the damage-controlling seismic design considering an MSAS sequence is also suggested. © 2023 Institution of Structural Engineers

关键词： Reinforced concrete

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Optimization Model of Maintenance Scheduling Problem for Heritage Buildings with Constraint Programming

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Buildings 2023年第7期13卷 1867页

作者： Liu, Shu-Shun Utami, Putri Budiwirawan, Agung Arifin, Muhammad Faizal Ardhiansyah Perdana, Fernanda Sarwatatwadhika Department of Civil and Construction Engineering National Yunlin University of Science & Technology Yunlin 640 Taiwan Department of Civil Engineering Universitas Negeri Semarang Semarang50229 Indonesia

The preservation and maintenance of ancient buildings, particularly heritage buildings, is a complex process that requires careful consideration of several aspects, including maintenance plans and budget availability. An effective long-term maintenance plan is crucial for preserving the historical value and condition of these buildings. The primary purpose of such a plan is to limit building deterioration, maintain optimal building performance, minimize operational costs and ensure budget constraints are met. This study introduces an innovative methodology to optimize maintenance strategies for heritage buildings in various scenarios, including normal conditions and the aftermath of possible catastrophic events. The proposed methodology compares different parameters, such as building conditions, building service life and various types of maintenance interventions. However, budget availability poses a significant challenge in many case studies, and addressing budgetary constraints is notoriously difficult. Limited budgets may hinder the implementation of desired maintenance activities, necessitating optimization of the maintenance plan to overcome these issues. To address these challenges, this study utilizes constraint programming (CP) as an optimization tool. Constraint programming is a powerful optimization methodology that addresses combinatorial problems by formulating them as mathematical models and handling the associated constraints. By representing the problem as one or more instances of the Constraint Satisfaction Problem (CSP), constraint programming enables efficient and effective problem solving. The proposed CP model proves to be a valuable tool in solving maintenance scheduling problems for heritage buildings. The results of this study are intended to assist decision makers in developing long-term maintenance plans for heritage building preservation. © 2023 by the authors.

关键词： Budget control

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