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BIM Implementation in Public Sector of Pakistan construction Industry

BIM Implementation in Public Sector of Pakistan Construction...

2018 International Conference on construction and Real Estate Management: Innovative technology and Intelligent construction, ICCREM 2018

作者： Ali, Babar Zahoor, Hafiz Mazher, Khwaja M. Maqsoom, Ahsen Dept. of Construction Engineering and Management National Univ. of Sciences and Technology Risalpur Campus 24080 Pakistan Dept. of Building and Real Estate Hong Kong Polytechnic Univ. Kowloon999077 Hong Kong Dept. of Civil Engineering COMSATS Institute of Information Technology Wah-Cantonment47040 Pakistan

ISBN: (数字)9780784481721

ISBN: (纸本)9780784481721

construction sector of Pakistan has rapidly developed with a higher growth rate of 9.05 percent during the period 2016-2017. However, a poor record of completing the projects in allocated time, cost, and with desired results is observed. One of the reasons for such poor performance is sticking to the traditional management practices that can be easily overcome with the implementation of building information modeling (BIM) tools. This study attempts to educate the stakeholders of the public sector of construction industry in Pakistan, as to how BIM can help them in minimizing the problems being faced during construction. BIM was implemented on a running construction project of a government hospital. The results were then presented to the key stakeholders, and they were asked to rank how BIM can help them in overcoming the problems. The stakeholders were generally convinced to use BIM on future construction projects, and agreed to take appropriate measures for BIM implementation in their departments. This research is expected to help in enhancing the performance of construction industry through BIM implementation. © 2018 American Society of civil Engineers.

关键词： construction industry

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Strengthening of RC members using post-tensioned metal straps: State of the research

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Lowland technology International 2018年第2期20卷 187-196页

作者： Imjai, T. Chaisakulkiet, U. Garcia, R. Pilakoutas, K. Construction Innovation Research Unit Dept. of Civil Engineering Rajamangala University of Technology Tawan-Ok Bangkok Thailand Dept. of Civil Engineering Rajamangala University of Technology Rattanakosin Bangkok Thailand Dept. of Civil and Structural Engineering University of Sheffield Sheffield United Kingdom

This article reviews the state of the research on a novel and cost-effective strengthening technique for substandard reinforced concrete (RC) structures that uses Post-Tensioned Metal Straps (PTMS). The technique applies active confinement around RC structures by post-tensioning metal straps using steel strapping tools as those used in the packaging industry. The literature survey in this study indicates that some research has been carried out in strengthening normal and high-strength concrete cylinders, columns, lap-spliced elements, beams in flexure, beams and joints in shear, as well as full-scale structures tested on a shake table. Analysis and design models also exist, thus indicating that the technique is reaching maturity. Overall, the experimental results available in the literature indicate that the use of PTMS strengthening is very successful at enhancing the capacity and ductility of structures. Consequently, the PTMS provide a fast and cost-effective strengthening solution in comparison to the other traditional strengthening methods. This study contributes towards a better understanding of the potential use of the PTMS technique as strengthening/retrofit solution, as well as towards highlighting future research needs. Ongoing research work on PTMS at Rajamangala University of technology Tawan-Ok is also summarised and commented upon. © 2018 International Association of Lowland technology. All rights reserved.

关键词： Metals

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Analyzing Risks in Public-Private-Partnership Projects: An Integrated Model of Sensitive Analysis and Monte Carlo Simulation

Analyzing Risks in Public-Private-Partnership Projects: An I...

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2018 International Conference on construction and Real Estate Management: construction Enterprises and Project Management, ICCREM 2018

作者： Feng, Chong Wang, Yaowu Dept. of Construction Management Harbin Institute of Technology Harbin150001 China Key Lab of Structures Dynamic Behavior and Control Ministry of Education Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters Ministry of Industry and Information Technology China

ISBN: (数字)9780784481752

ISBN: (纸本)9780784481752

Compared with traditional financing mode of construction, public-private-partnership (PPP) mode has the great opportunity that private enterprises develop rapidly and solved the shortcomings that the amount of infrastructure investment is large and governments lack funds. Thus PPP mode is being adapted extensively. The keys to successfully implement PPP mode are effectively identifying and analyzing risks in PPP projects, in order to achieve the risk management of PPP projects. The research is aimed to establish a risk analysis model of PPP projects combining the sensitive analysis and Monte Carlo simulation. Then it uses a real case "Shijiazhuang International Exhibition Center" to verify this model and proposes strategies to deal with the main risks. The result of this case study proved effectiveness of the proposed model, which can be used in further risk analysis of PPP projects. © 2018 American Society of civil Engineers.

关键词： Risk analysis

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Patch antenna sensor rosettes for surface strain measurement

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Proceedings of the Institution of civil Engineers: Smart Infrastructure and construction 2017年第2期170卷 39-49页

作者： Li, Dan Cho, Chunhee Wang, Yang School of Civil and Environmental Engineering Georgia Institute of Technology AtlantaGA United States Department of Civil and Environmental Engineering and Construction University of Nevada Las VegasNV United States

Passive (battery-free) wireless patch antenna sensors have been developed in recent years for strain sensing, to provide convenient and low-cost instrumentation. Despite past efforts, current analytical and experimental studies have mainly focused on performance in single-axial measurement, which is simple and unrealistic from typically encountered arbitrary plane stress fields. This paper presents strain sensor rosettes made of folded patch antennas and slotted patch antennas for measuring an arbitrary surface strain (plane stress) field. The transverse strain effect of both sensors is discussed and has been validated through laboratory experiments. Multiphysics coupled simulation is conducted to describe accurately the mechanical and electromagnetic behaviours of antenna sensors. Resonance frequency shifts of the antenna sensors are used to derive the three strain components in an arbitrary plane stress scenario-that is, two normal and one shear strain components. Both numerical studies and experimental validations have been performed. © ICE Publishing: All rights reserved.

关键词： Microstrip antennas

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Improvement of fatigue durability in welded gusset joints by CF sheets using VARTM technique 9

Improvement of fatigue durability in welded gusset joints by...

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9th International Conference on Fibre-Reinforced Polymer (FRP) Composites in civil engineering, CICE 2018

作者： Thay, V. Tan, C. Nakamura, H. Matsui, T. Lin, F. Tokyo Metropolitan University Department of Civil and Environmental Engineering Tokyo Japan Toray Industries Inc. ACM Technology Department Tokyo Japan Yunnan University School of Urban Construction and Management Kunming City China

Vacuum assisted Resin Transfer Molding (VaRTM) as a composite fabricating technique can be used to apply Carbon Fiber (CF) sheets on cracked steel structures. This paper deals with the fatigue durability of typical welded gusset joints in steel bridges strengthened by externally bonded CF sheets using VaRTM technique. The strengthened operation work have been proven to be very efficient and convenient even on complex shapes of structures due to the flexibility of this method. Perfectly close contact particularly between weld beads and the CF sheets provides a great advantage on reduction of the high stress concentration which is usually occurred at the fillet weld toe at the end of gusset plate. The reduction of stress concentration at weld toe was analytically investigated, where the 3D FEM models were simulated from a number of image data taken from actual experimental specimens by digital camera. The target specimens of welded gusset plates were fabricated and subjected to cyclic load. The fatigue tests of two types of specimens, non-strengthened and strengthened specimen using VaRTM technique in the parameters of number of layers of CF sheets, have been conducted and strengthened effects have been evaluated under applied stress ranges experimentally. The result shows that the fatigue durability of welded gusset joints strengthened by CF sheets using VaRTM technique can be remarkably improved. © INTER-NOISE 2019 MADRID - 48th International Congress and Exhibition on Noise Control engineering. All rights reserved.

关键词： Welds

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Model experimental study on GFRP anchor reinforcement and soil deformation

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Journal of Physics: Conference Series 2021年第1期2044卷

作者： Xu-mian Lin Yue Qin Lin-liang OuYang Hai-yang Jiang Jin-jian Yang Chao Chen Dacheng Kechuang Foundation Construction Co. Ltd. Wuhan Hubei 430040 China School of Civil Engineering and Architecture Wuhan University of Technology Wuhan Hubei 430070 China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan Hubei 430071 China Agile Real Estate Property Co. Ltd. Guangzhou Guangdong 510623 China

Due to the application of reinforced anchor technology in soil reinforcement, the anchor after long-term use will have serious corrosion, which greatly affects the safety of the engineering structure, leading to engineering accidents. In this paper, GFRP (Glass Fiber Reinforced Polymer) anchor is used instead of reinforced bolt for the pull-out experiment. In order to investigate the deformation of the soil around the GFRP anchor solid in the process of drawing, this paper improves the traditional indoor model pull-out experiment of GFRP anchor and introduces PIV (Particle Image Velocimetry) technology and its application to the analysis of soil deformation in the process of drawing.

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Heavy Machinery Operators: Necessary Competencies to Reduce construction Accidents

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IOP Conference Series: Earth and Environmental Science 2021年第1期641卷

作者： J K Bedi R A Rahman Z Din Faculty of Civil Engineering Technology Universiti Malaysia Pahang Lebuhraya Tun Razak 26300 Kuantan Pahang Malaysia Earth Resources and Sustainability Centre Universiti Malaysia Pahang Lebuhraya Tun Razak 26300 Kuantan Pahang Malaysia Department of Construction Management University of Houston 4734 Calhoun Rd Houston TX 77204 United States

The construction industry has been consistently performing poorly in safety resulting in substantial human and economic losses globally. The hazard related to heavy machinery operations can lead to injury or fatality of operators, workers, or visitors. Thus, safety training of heavy machinery operators (HMOs) is crucial to perform their tasks safely on construction projects. HMOs face various risks due to complex work environments at a job site such as the presence of other workers, material flow, equipment motion, and temporary structures that limit the space for heavy machinery. This research identifies the causes of accidents and competencies required to eliminate these accidents associated with heavy machinery operators. To achieve that, interview data with fifteen construction project managers are analyzed. This study's findings suggest that the causes of heavy machinery accidents include insufficient maintenance, negligence of operators, inadequate training, human factor, and site condition. Conversely, the competencies to mitigate heavy machinery accidents are knowledge of safety incentives and penalties from safety training, the ability to conduct safety briefing, inspect heavy machinery and site conditions, and communication skills. Industry practitioners and researchers can use these findings to enhance construction productivity by creating a safe working environment at construction sites.

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Strength prediction using ANN for concrete with Marble and Quarry dust

Strength prediction using ANN for concrete with Marble and Q...

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International Conference on Intelligent Computing and Communication for Smart World (I2C2SW0)

作者： S. Anandaraj Jessy Rooby Gobinath Ravindran Arun Kumar Beerala Vikram Mulukalla Swathi Koduri Department of Civil Engineering Hindustan Institute of Technology and Science Chennai India Department of Civil Engineering and Center for construction method and Materials S R Engineering College Warangal India Department of Civil Engineering S R Engineering College Warangal India

ISBN: (纸本)9781538694336

Modern construction material research is picking impetus in the recent two decades; a greater number of admixtures and combinations were tried by bountiful researchers across the globe. In this work an attempt is made to obtain the strength characteristics by using Soft computing techniques in the marble and quarry dust impregnated concrete. Strength characteristics of concrete is studied with reference to the addition of the above-mentioned admixtures and the results were given as input parameters. 28 days compressive strength of concrete with varying marble and quarry dust content is utilized as input data for the neural network and a model is created which is used to predict the strength. To prepare the ANN model the results are taken and the values obtained are mean square propagation and the testing, training, validation and for overall propagation the values are 0.99793, 0.99577, 0.9927 and 0.99073 and the best validation performance is 0.023295 at epoch 7 respectively for MD and for QD the values are 0.9974, 0.94374, 0.94445 and 0.947 and the best validation performance is 0.035578 at epoch 4 respectively. It is found that neural network can be utilized effectively to predict the strength characteristics of concrete.

关键词： Concrete Aggregates civil engineering Training Artificial neural networks Neurons Data models

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Big-data driven building retrofitting: An integrated Support Vector Machines and Fuzzy C-means clustering method

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IOP Conference Series: Earth and Environmental Science 2020年第4期588卷

作者： Weizhuo Lu Kailun Feng Department of Civil Environmental and Natural Resources Engineering Luleå University of Technology Department of Construction Management Harbin Institute of Technology Harbin 150009 China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin 150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin 150090 China

It has become a mainstream to use physical models to quantify expected energy savings from alternative retrofit methods and technologies. However, they are not suitable for predicting energy use of buildings when detailed and specified input parameters are unavailable. The overall purpose of the research is to support the stakeholders in taking decisions on refurbishments options when not all of physical information is available, in order to achieve the Swedish Energy Agency's measurements of near-zero energy buildings. The research will transfer big data from Swedish Energy Performance Certificates for building retrofitting. A Support Vector Machines and Fuzzy C-means clustering (SVM-FCM) integrated machine learning algorithm is used directly to extract the case-specific knowledge from EPC big data regarding building characteristics and energy saving of retrofit measures. It enables to prioritize retrofit measures and compute their expected energy savings for buildings. This proposed data driven method is an attempt of taking advantage of big data for practical building retrofit selection.

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Study of the matrix-fiber bond behavior of carbon and glass FRCM composites 9

Study of the matrix-fiber bond behavior of carbon and glass ...

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9th International Conference on Fibre-Reinforced Polymer (FRP) Composites in civil engineering, CICE 2018

作者： Sneed, L.H. D'Antino, T. Gonzalez-Libreros, J.H. Carloni, C. Pellegrino, C. Missouri University of Science and Technology Department of Civil Architectural and Environmental Engineering 1401 North Pine St. RollaMO65409 United States Politecnico di Milano Department of Architecture Built Environment and Construction Engineering Piazza Leonardo Da Vinci 33 Milan20133 Italy University of Padova Department of Civil Environmental and Architectural Engineering Via F. Marzolo 9 Padua35131 Italy University of Bologna Department of Civil Chemical Environmental and Materials Engineering Viale Risorgimento 2 Bologna40136 Italy

Strengthening and retrofitting of existing reinforced concrete (RC) elements have been gaining interest in recent decades. Among the strengthening solutions available, fiber reinforced composites present certain advantages, such as high strength-to-weight ratio and low invasivity, which make them attractive in some applications. In particular, fiber reinforced polymer (FRP) composites have been successfully employed for bending and shear strengthening and for confinement of axially loaded elements, however they suffer from UV degradation, (relatively) high temperature exposure, and cannot be applied onto wet surfaces. To overcome these limitations, which are mostly related to the use of organic binders (usually epoxy resins), a new type of composite comprised of a fiber mesh embedded within an inorganic matrix has recently been developed and is referred to as fiber reinforced cementitious matrix (FRCM) composites. While FRCM composites have proven effective for strengthening RC elements, each specific composite presents a different behavior and needs to be properly characterized. In this paper, the results of single-lap direct-shear tests of carbon and glass FRCM-concrete joints are presented and discussed. Specimens with different composite bonded lengths were tested in an attempt to identify the effective bond length of each composite. The debonding stress experimentally obtained for carbon FRCM composites is also compared with that obtained through a fracture mechanics approach based on fiber strains measured on the same material using strain gauges bonded to the longitudinal fibers. © 2019 9th International Conference on Fibre-Reinforced Polymer (FRP) Composites in civil engineering, CICE 2018. All Rights Reserved.

关键词： Epoxy resins

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