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Research Progress and Outlook on Critical Characteristics of Submerged Floating Tunnels

Procedia engineering 2016年 166卷 347-354页

作者： Ding Hao Li Qinxi Jiang Shuping Li Ke China Merchants Chongqing Communications Technology Research & Design Institute Co. Ltd. Chongqing 400067 china National Engineering Laboratory for Highway Tunnel Construction Technology Chongqing 40067 china College of Civil Engineering Chongqing Jiaotong University Chongqing 400074 china

As a new traffic structural form, submerged floating tunnels are still in the initial engineering stage. To focus on the research direction as soon as possible, it is necessary to conclude and make contrastive analysis on the research results of submerged floating tunnels. The section forms, the actions of wave force and ocean current force, structural dynamic response and anchor cable stability etc of submerged floating tunnels are selected to serve as the critical indexes of characteristics or roles, being the main analysis object. Based on a great deal of research and investigation on scientific and technical literatures, the research methods, conclusions and consensuses etc are compared, and the research blank and development trend are analyzed. The results indicate: (1) the section forms are determined based on the circumstance of flowing water. An experimental study under large Reynolds number needs to be carried out in the future; (2) According to the actual environmental research, wave force can serve as one of the important bases for the determination of suspension depth; (3) The law of ocean current effect of submerged floating tunnels requires further empirical coefficient research, and fatigue damage also can serve as future research direction; (4) Dynamic response can concentrate on large-scale model experiment as well as the influence of traffic behavior in submerged floating tunnels under dynamic response; (5) Anchor cable stability can focus on vibration reduction method of anchor cable character parameters and semi-active or active vibration reduction control method of anchor cable itself; (6) The future research emphasis should be laid on the large-scale submerged floating tunnel model experiment in complex water area environment. The above conclusions point out the direction for the future research in the field.

关键词： submerged floating tunnel dynamic response section wave ocean current anchor cable

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A Real-time Web-based Wildfire Simulation System 42

A Real-time Web-based Wildfire Simulation System

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42nd Conference of the Industrial Electronics Society, IECON 2016

作者： Wu, Rui Chen, Chao Ahmad, Sajjad Volk, John M. Luca, Cristina Harris, Frederick C. Dascalu, Sergiu M. Department of Civil and Env. Engr. and Construction University of Nevada Las Vegas Las VegasNV United States Computing and Technology Anglia Ruskin University Cambridge United Kingdom Department of Geological Sciences and Engineering University of Nevada Reno RenoNV United States Department of Computer Science and Engineering University of Nevada Reno RenoNV United States

ISBN: (纸本)9781509034741

In order to simplify current fire simulation models for more wide-spread use, a Real-time Web-based Wildfire Simulation System (RWWSS) was developed. RWWSS is a web-based application that provides free access to exploring wildfire simulations. It was developed as an educational tool for the purpose of helping people understand the mechanism of fire propagation and its key impact factors, as well as for motivating fire prevention efforts. The model was implemented using the geography of the Lehman Creek watershed, Great Basin National Park, Nevada, USA. Through numerical simulation of fire propagation, the features of fire intensity, direction, and duration, based on the key factors of slope, wind, and vegetation type are estimated and presented on a 2D map. The user can change these key factors, making the application interactive. With improvements to the model RWWSS could be used for further research purposes. © 2016 IEEE.

关键词： Education Fire simulation Real time RWWSS Web-based application

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Enlightenment to Floating Tunnel of Existing Typical Submerged Tunnel

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Procedia engineering 2016年 166卷 355-361页

Currently, submerged floating tunnel still stays in scientific research stage, while many submerged tunnels have been built by use of borehole-blasting method, shield method, immersed tube method and other traditional construction methods. This paper, through wide literature research and engineering data collection, analyzes construction environment limits and typical operating diseases of submerged tunnels for various traditional construction methods, and, specific to the eight typical major water areas including Taiwan Strait, Qiongzhou Strait, Bohai Strait, Bering Strait, and Messina Strait, discusses and analyzes enlightenment to floating tunnel project of existing submerged tunnel: (1) For submerged tunnels using traditional construction method, only from the point of view of construction environment limits, existing construction experience and technology have already been not suitable for 50∼87.5% of typical major water areas, technical breakthrough or innovation is required, while floating runnel will be one of the effective options for these water areas. (2) For construction of submerged tunnels in part of major water area, combination of traditional construction method+floating method will be one effective method. (3) Water leakage, lining material degradation and rebar corrosion and expansion and other diseases and specific difficulties in maintainability and durability of structure and connection components for submerged tunnels using traditional construction method will be main operating diseases for floating tunnel.

关键词： floating tunnel submerged tunnel strait disease operation

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Progressive failure processes of reinforced slopes based on general particle dynamic method

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Journal of Central South University 2015年第10期22卷 4049-4055页

作者：赵毅周小平钱七虎 State Key Laboratory of Coal Mine Disaster Dynamics and Control (Chongqing University) School of Civil Engineering Chongqing University Key Laboratory of New Technology for Construction of Cities in Mountain Area of Ministry of Education (Chongqing University) Engineering Institute of Engineering Crops PLA University of Science and Technology

In order to resolve grid distortions in finite element method(FEM), the meshless numerical method which is called general particle dynamics(GPD) was presented to simulate the large deformation and failure of geomaterials. The Mohr-Coulomb strength criterion was implemented into the code to describe the elasto-brittle behaviours of geomaterials while the solid-structure(reinforcing pile) interaction was simulated as an elasto-brittle material. The Weibull statistical approach was applied to describing the heterogeneity of geomaterials. As an application of general particle dynamics to slopes, the interaction between the slopes and the reinforcing pile was modelled. The contact between the geomaterials and the reinforcing pile was modelled by using the coupling condition associated with a Lennard-Jones repulsive force. The safety factor, corresponding to the minimum shear strength reduction factor "R", was obtained, and the slip surface of the slope was determined. The numerical results are in good agreement with those obtained from limit equilibrium method and finite element method. It indicates that the proposed geomaterial-structure interaction algorithm works well in the GPD framework.

关键词： general particle dynamic algorithm（GPD） slope stability progressive failure process geomaterial-structure interaction

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Influence of aggregate type and chemical admixtures on frost resistance of lightweight mortars

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AIP Conference Proceedings 2017年第1期1866卷

作者： Beata Klimek Marcin K. Widomski Danuta Barnat-Hunek 1Department of Construction of Built Heritage Faculty of Civil Engineering and Architecture Lublin University of Technology Nadbystrzycka Street 40 20-618 Lublin Poland 2Faculty of Environmental Engineering Lublin University of Technology Nadbystrzycka Street 40b 20-618 Lublin Poland 3Department of Construction Faculty of Civil Engineering and Architecture Lublin University of Technology Nadbystrzycka Street 40 20-618 Lublin Poland

The aim of studies presented in this paper covered analyses of type of lightweight aggregate as well as aeration and hydrophobic admixtures influence on absorbability and frost resistance of heat-insulating mortars applied in the energy-efficient construction. In the presented research, expanded perlite (EP) and expanded clay aggregate (ceramsite) were used as lightweight aggregates. The measurements of the basic mechanical and physical characteristics of tested mortars were performed, including, inter alia, compressive and flexural tensile strength, density, effective (open) and total porosity, absorbability, thermal conductivity as well as frost resistance after 25 cycles of freezing and thawing. Substitution of some part of sand fraction by the lightweight aggregates, expanded clay aggregate or perlite, resulted in changes in physical properties of the tested mortars. The observed decrease in density (specific weight), coefficient of heat transport and strength parameters were simultaneously accompanied by the increase in absorbability. Researches concerning frost resistance of mortars containing ceramsite and perlite showed the improved frost resistance of mortar utilizing perlite. Most of the tested mortars shoved satisfactory frost resistance, only samples of mortar containing ceramsite and aeration admixture were destroyed. The significant influence of aerating admixture on frost resistance of mortars was determined. Hydrophobic siloxanes addition failed to adequately protect the mortars against frost erosion, regardless the type of applied aggregate.

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Energy Storage System Comparison for mini electrical Bus

Energy Storage System Comparison for mini electrical Bus

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International Symposium on Power Electronics, Electrical Drives, Automation and Motion

作者： F. Ciancetta A. Ometto A. Rotondale G. D'Ovidio C. Masciovecchio A. Dannier Dept. of Industrial and Information Engineering and Economics University of L'Aquila Department of Civil Construction-Architectural and Environmental Engineering University of L'Aquila Department of Electrical and Information Technology Engineering University of Naples Federico II

ISBN: (纸本)9781509020683

The paper concerns the analysis of urban electrical mini-bus power configurations based on two different energy storage systems. Full electrochemical battery power solution and hybrid power configuration based on battery and fuel cell are considered, modelled and analyzed. Performance analyses are carried out by modeling the two different powered mini-buses running along the same drive cycle experimentally tested in actual traffic conditions. The results are compared and discussed in term of performance.

关键词： Electric vehicles Urban transport Fuel cell

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Development of a window-cleaning robot powered by new renewable energy capable of continuous operation during obstacle avoidance

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International Journal of Sustainable Building technology and Urban Development 2016年第3-4期7卷 214-218页

作者： Kim, Kyoontai Jun, Younghun Construction System Research Centre Korea Institute of Civil Engineering and Building Technology Gyeonggi-Do South Korea

In recent years, many luxurious buildings have been built in South Korea. Luxury shops and services such as health clinics, fitness centres, beauty salons and banks–which place a high importance on their image–have moved onto the second, third, fourth and fifth floors of buildings. For the owners of these businesses, it is important to keep their windows clean–not to mention the shop itself. However, it is hard for them to clean their windows as often as they want, when their shops are located on the second floor of a building or higher. The aim of this study is to establish the performance criteria for an external window-cleaning robot that uses new renewable energy, and to develop a driving mechanism that meets such criteria. Through an interview with experts and research on the current state of related technology, the performance criteria for the robot were defined, and then the driving mechanism for its implementation was developed. The possibility of avoiding any obstacles without a stop was identified, but it is evaluated that there are limits to its applicability in that the system became more complex and more energy was consumed when implementing this functionality. © 2017 Informa UK Limited, trading as Taylor & Francis Group.

关键词： cleaning robot construction automation maintenance new renewable energy window cleaning

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Influence of Selected Stakeholders of construction Investment Projects on the Course of Project

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IOP Conference Series: Materials Science and engineering 2017年第7期245卷

作者： Jadwiga Bizon-Górecka Jarosław Górecki Department of Construction Engineering and Management Faculty of Civil and Environmental Engineering and Architecture University of Science and Technology Bydgoszcz Al. prof. S. Kaliskiego 7 85-796 Bydgoszcz Poland.

The article presents an entity perspective of the construction investment projects. In a course of the project there are stakeholders who have an indirect influence (e.g. decision-makers in the selection of projects) or a direct influence (e.g. members of the project team). An intuitive opinion about a significant influence of project stakeholders on the project's course encouraged the authors to undertake a research in this area. The article illustrates the initial phases of the construction project life cycle in a perspective of the entities and, in particular, a role of different stakeholders in making decisions that affect a course of the project. An analysis of the structure of the construction project life cycle makes a substantial involvement of various subjects in the initial phases of the project, i.e. in an initial phase and during a creation of the structures. A key point is to underline the factors of decision-making by the participants of the construction process. It was indicated that the stakeholders have a different impact on the course of the project. In large projects, which have many stakeholders, their role in the implementation of the investment project can vary, depending on the life cycle of the project. They can have positive or negative impacts on achieving the project objectives. The paper presents the results of 100 surveys made among participants of the building processes, executors of the construction projects in the Kuyavian-Pomeranian region. The study was conducted in December 2016 and January 2017. It revealed what is the impact of individual stakeholders of the construction projects on the course of the project. A special attention was paid to a complex relationship between objectives of the project and stakeholders' goals. A great care to the smallest possible number of risks, which may arise from the different objectives of the project and its stakeholders' goals, should be focused on the augmentation of correlation of measures of

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EU-GUGLE: A sustainable renovation for smarter cities from a pilot project

Green Energy and Technology

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Green Energy and technology 2017年 353-382页

作者： Morishita, Naomi Heidenreich, Michael Hemmers, Rosa Vankann, Maria Sahakari, Tiina Vainio, Terttu Pagliano, Lorenzo Treberspurg, Martin Österreicher, Doris TU Wien Research Center for Building Physics and Sound Protection Institute for Building Construction and Technology Karlsplatz 13 Vienna1040 Austria Department of Civil Engineering and Natural Hazards Civil Engineering Institute Sustainable Constructions Working Group University of Natural Resources & Life Sciences Peter-Jordan-Straße 82 Vienna1190 Austria SynergieKomm Agency for Sustainability and Innovation Schumannstraße 35 BonnD-53113 Germany Stabsstelle Klimaschutz Lagerhausstraße 20 AachenD-52064 Germany Ecofellows Ltd. Tampere Finland VTT Technical Research Centre of Finland Ltd. Espoo Finland End-use Efficiency Research Group Energy Department Politecnico di Milano Via Lambruschini 4 Milan20156 Italy

The European building stock is mature, and expanding cities need inclusive and innovative renovation solutions for all citizens while intensifying city densification. The European project EU-GUGLE aims to reduce primary energy consumption by 40-80 % and increase renewable energy use by 25 % through nearly zero-energy building renovation models for initiating large-scale, Europe-wide replication in cities and communities. About 200,000 m2 of residential and public buildings are being refurbished by implementing a balanced mix of technical, socio-economic, and financial solutions adapted to local needs. Six EU partner cities are participating, each revitalizing an urban district: Aachen, Bratislava, Milan, Sestao, Tampere, and Vienna. The comprehensive integrated approach used in EU-GUGLE is in line with the European Smart City initiative, and each participating city has created nearly zero-energy Smart City master plans based upon lowest-energy thermal renovations coupled with innovative renewable energy services incorporating every aspect of smart district life. All stages of the planning, construction, and post-occupancy phases of the large-scale district renewals are being documented, monitored, and evaluated to create sustainable district renovation methodologies for "smart renovations for smart cities" to meet the objectives of the European Commission’s Smart Cities and Communities Initiative for reducing greenhouse gas emissions by 40 % within the European Union by 2020. The paper outlines the approach each city has taken and highlights case studies of the individual solutions created in three of the six cities. © Springer International Publishing Switzerland 2017.

关键词： Energy utilization

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Application of Crushed Concrete in Geotechnical engineering – Selected Issues

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IOP Conference Series: Earth and Environmental Science 2017年第2期95卷

作者： Jacek Kawalec Slawomir Kwiecien Anton Pilipenko Jarosław Rybak Silesian University of Technology Faculty of Civil Engineering ul. Akademicka 2A 44 - 100 Gliwice Poland Moscow State University of Civil Engineering Department of Construction Materials 26 Yaroslavskoye Shosse Moscow Russia Wrocław University of Science and Technology Faculty of Civil Engineering Wyb. Wyspiańskiego 27 50-370 Wrocław Poland

The reuse of building materials becomes an important issue in sustainable engineering. As the technical requirements for civil engineering structures changes with time and the life time is limited, the need of building new objects meets the necessity of recycling of the existing ones. In the case of steel structures, the possibility of recycling is obvious, also in the case of wooden constructions, the possibility of 'burning' solves the problem. The concrete waste is generated mainly as a result of the demolition and reconstruction of residential and industrial buildings. These types of waste are basically made from crushed rocks and cement minerals and contain non-hydrated cement particles in its composition. Concrete poses a lot of problems mainly for two reasons. It is difficult to crush, heavy and hard to transport and demanding in reuse. Different fractions (particle sizes) may be used for different purposes. Starting from very fine particles which can be used in concrete production, through regular 16-300 mm fractions used to form new fills and fill the mats, up to very irregular mixtures used to form stone columns by means of Impulse Compaction or in Dynamic Replacement. The presented study juxtaposes authors experience with crushed concrete used in civil engineering, mainly in geotechnical projects. Authors' experiences comprise the application of crushed concrete in the new concrete production in Russia, changing pulverized bridge into the fill of mesh sacks, or mattresses used as an effective way to protect the shoreline and the New Orleans East land bridge after Katrina storm (forming a new shoreline better able to withstand wave actions), and finally the use of very irregular concrete fractions to form stone columns in week soils on the example of railway and road projects in Poland. Selected case studies are presented and summarized with regard to social, technical and economic issues including energy consumption needed for proposed technologies and dy

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