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检索条件"丛书名=Lecture Notes in Civil Engineering"

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The Influence of Different Excavation Methods on Deep Foundation Pit and Surrounding Environment 1

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8th International Conference on civil engineering (ICCE)

作者： Yang, Yongming Li, Xiwen Chen, Yao China Univ Minning & Technol Sch Mech & Civil Engn Beijing Peoples R China

ISBN: (数字)9789811912603

ISBN: (纸本)9789811912603;9789811912597

Taking a deep foundation pit in Shijiazhuang, Beijing as the background of the project, combined with the excavation range of the deep foundation pit and the spatial location and geometry of the surrounding engineering bodies, FLAC3D software is used to establish a numerical model of the deep foundation pit excavation containing the deep foundation pit, surrounding buildings and underground tunnels and other engineering bodies. The numerical model truly reflects the geometric size and spatial location relationship between deep foundation pit and surrounding engineering bodies. Based on the numerical model, the numerical simulation of deep foundation pit excavation under different excavation methods was carried out. The analysis of the horizontal displacement of the support structure during the excavation of the deep foundation pit, the investigation of the surrounding buildings and surface settlement and the deformation of the metro tunnel. The influence mechanism of different excavation methods on the safety of deep foundation pit, surrounding buildings and tunnel were discussed. It is concluded that the excavation method has less influence on the deformation and displacement of the deep foundation pit and the surrounding buildings and tunnels under the condition of shallow excavation depth. As the excavation depth increases, the effect of the excavation method on the deformation of the deep foundation pit, buildings, tunnels and surface settlement increases. The layered excavation method is suitable for deep foundation pits with shallow excavation depths, while the layered section excavation method is more suitable for deep foundation pits with deep excavation depths. Deep foundation pit excavation has a smaller effect on the deformation of the tunnel. The surrounding buildings have a greater influence on the deformation during the excavation of the deep foundation pit, but the effect of the buildings on it is less than the limiting effect of the prestressing anch

关键词： Deep foundation pit Different excavation methods Complex engineering environment

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Flexible Blades Wind-Turbines: Giant Installations and System-of-Systems Approach to Optimizing Wind-Energy Farms 6th

Flexible Blades Wind-Turbines: Giant Installations and Syste...

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6th International Conference on Geotechnics, civil engineering and Structures (CIGOS)

作者： Ibrahimbegovic, Adnan Univ Technol Compiegne Ctr Rech Royallieu Chair Computat Mech Alliance Sorbonne Univ Compiegne France IUF Inst Univ France Paris France

ISBN: (纸本)9789811671609;9789811671593

In this work we seek to elaborate a couple of new concepts of off-shore and inland wind-turbines with respect to currently dominant system, which was, to a large extent, developed in Denmark and in Northern Germany. Both of these locations provide near steady winds close to optimal conditions for wind-turbines operation. For any other location, the system is far from optimal performance, mostly sitting idle waiting for optimal wind speed. This new concept to evaluate concerns the wind-turbines with flexible blades, which are easy to start for mild winds, like the leaves on a tree, but more difficult to control for strong winds, with large overall motion of flexible blades. There are multiple main scientific challenges in this work seeking a judicious combination of scientific progress in Mechanics, Control and Stochastics in order to provide the simulation tools for elaboration of such a new concept. In particular, we need to develop detailed models capable of describing the large displacements and rotations of flexible blades (including evaluation of risk to blades failure), the reduced basis approach that can furnish the optimal support for control algorithm of large overall motion of flexible blades and stochastic approach able to quantify the effects of variable wind conditions that can be obtained from measurements of wind-turbine deformations by solving an inverse problem. All these developments will be combined in simulation tools, which will be validated against experimental results and more elaborate predictive computations of underlying multiphysics problems. The main product to deliver is to achieve a novel concept of inland wind-turbines, referred to as Perpetual Mobile, which offers the optimal capacity for harvesting energy at large variations of wind speeds and for perfectly adapting to variable conditions inside wind-turbine farms. The side product to deliver concerns the simulation tools to be developed, which will also be of interest for other mult

关键词： Wind turbine Wind load Energy-conserving scheme Long-term simulation

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A Possibility of Utilizing Extra-Strong Synthetic Fiber Reinforced Concrete with Local Materials in Vietnam 6th

A Possibility of Utilizing Extra-Strong Synthetic Fiber Rein...

引用

6th International Conference on Geotechnics, civil engineering and Structures (CIGOS)

作者： Dinh Van Hiep Nguyen Cong Thang Nguyen Van Khanh Aihara, Masaya Nozawa, Tadaaki Nomura, Tadashi Hanoi Univ Civil Engn 55 Giai Phong Str Hanoi Vietnam Vietnam Japan Engn Consultants 243A De La Thanh Str Hanoi Vietnam SE Corp Shinjuku Ku 6-5-1 Nishi Shinjyuku Tokyo Japan

ISBN: (纸本)9789811671609;9789811671593

Extra-Strong Synthetic Fiber Reinforced Concrete is one of ultra-high performance concrete products which are applied for special structures and for prestressed concrete structures. Although the product has its supper advantage for practical applications, its cost is extremely expensive, especially for developing countries like Vietnam. Therefore, the objective of this study is to utilize local materials (i.e. cement, sand and mineral admixtures) to lower the cost and enable developing countries to apply the product. Through the experiment assignment with local materials provided in Vietnam, we have examined the capacity of workability, compressive strength, flexural strength, elastic modulus, and split tensile strength. Based on experimental results, the possibility of utilizing Extra-Strong Synthetic Fiber Reinforced Concrete with the local materials have been validated according to the comparison with original products.

关键词： UHPC ESCON Local materials Developing countries

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FRP Confined Concrete: What, Why, and How? 10th

FRP Confined Concrete: What, Why, and How?

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10th International Conference on Fibre-Reinforced Polymer (FRP) Composites in civil engineering (CICE)

作者： Feng, Peng Yang, Jia-Qi Li, Zhiyuan Tsinghua Univ Dept Civil Engn Beijing 100084 Peoples R China China Univ Min & Technol Beijing Sch Mech & Civil Engn Beijing 100083 Peoples R China

ISBN: (纸本)9783030881665;9783030881658

The post-yield hardening (PYH) behaviour is an important character of FRP confined concrete which has been studied by researchers worldwide for decades. In the phenomenon-based level, the authors propose a 3D geometrical method to interpret the mechanisms of analysis-oriented models. This method unifies most existing analysis- and design-oriented models. For the mechanism-based study, the physical behaviour of the FRP confined concrete is revealed by X-ray computed tomography (CT), and the initiation and propagation of the internal cracks are captured by the scanned images. Further, path dependency of FRP confined high-strength concrete (HSC) and nonlinear biaxial behaviour of FRP tube are modelled using the 3D geometrical method. Finally, this paper provides an introduction to the recent development of composite structural elements from the authors' research group, which can maximize the confining efficiency and can improve the structural performance significantly.

关键词： Confined concrete Analysis-oriented model CT scanning Biaxial behaviour Composite structures

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Seismic Performance of SDOF System with a Negative Stiffness-Inerter System 10th

Seismic Performance of SDOF System with a Negative Stiffness...

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10th International Conference on the Behaviour of Steel Structures in Seismic Areas (STESSA)

作者： Yang, Jia-qi Sun, Fei-Fei Tongji Univ Dept Struct Engn Shanghai Peoples R China Tongji Univ State Key Lab Disaster Reduct Civil Engn Shanghai Peoples R China

ISBN: (纸本)9783031038136;9783031038112;9783031038105

The seismic mitigation performance of the negative stiffness-inerter system (NSIS) is investigated by frequency-domain analysis and time-history analysis. In the NSIS, the inerter is connected with a dashpot and a negative stiffness (NS) spring in parallel, which amplifies the stroke of the dashpot. Therefore, the inerter and the NS provide a significant damping magnification effect, and this feature is desired for reducing the structural responses effectively when subjected to earthquakes. The closed-form expressions of optimal parameters for an uncontrolled SDOF system with NSIS are proposed by the "fixed point" method. Then, the performance of NSIS is evaluated under actual earthquakes. Results show that the optimal NSIS can substantially reduce the displacement and acceleration responses of the SDOF system simultaneously under far-field earthquakes. For instance, the seismic responses for most structural period ranges can be reduced by 20%-55%. Besides, the seismic mitigation capacity of the inerter system (IS), the negative stiffness amplifying damper (NSAD), and the NSIS are compared, and these three systems utilize the optimal parameters. The results show that when the structural period is smaller than one sec, the displacement responses of NSIS are 20% less than the IS and 11.1% less than the NSAD. And, the acceleration reduction ability of the NSIS is better than the IS but worse than the NSAD.

关键词： Negative stiffness Inerter Fixed-point method Time-history analysis

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Parametric Study and Finite Element Modelling of Damage-Free Self-centring Column Bases with Different Structural Properties 10th

Parametric Study and Finite Element Modelling of Damage-Free...

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10th International Conference on the Behaviour of Steel Structures in Seismic Areas (STESSA)

作者： Elettore, Elena Freddi, Fabio Latour, Massimo Rizzano, Gianvittorio Univ Salerno Dept Civil Engn Salerno Italy UCL Dept Civil Environm & Geomat Engn London England

ISBN: (纸本)9783031038136;9783031038112;9783031038105

Many recent research studies have focused on the development of innovative seismic-resilient structural systems to reduce repair costs and downtime in the aftermath of severe earthquake events. In this regard, dealing with steel Moment Resisting Frames (MRFs), recent experimental and numerical studies have demonstrated the benefits deriving from the replacement of conventional full-strength column bases (CBs) with innovative damage-free and self-centring CBs, for both damage and residual drifts reductions. Although several technologies have been conceived, studied, and experimentally tested in this direction, only a few research studies investigated the significant properties of the connections influencing the self-centring capability of these systems. Focusing on a damage-free self-centring steel CB previously investigated by the authors, the present study performs a parametric analysis to evaluate the influence of some design parameters on the seismic performance of steel Moment Resisting Frames (MRFs). Three CB configurations belonging to different casestudy MRFs are investigated. Finite element (FE) models of the CB configurations have been designed and developed in the ABAQUS, considering sixteen different cases for each configuration. The FE analysis confirms the effectiveness of the theoretical design methodology and provides additional insights to improve the design requirements.

关键词： Finite element analysis Parametric Self-centring column bases Structural properties

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Experimental Evidences and Numerical Modelling of SRG Systems Under Uniaxial Load 10th

Experimental Evidences and Numerical Modelling of SRG System...

引用

10th International Conference on Fibre-Reinforced Polymer (FRP) Composites in civil engineering (CICE)

作者： Roscini, Francesca Malena, Marialaura de Felice, Gianmarco Roma Tre Univ Dept Engn Rome Italy

ISBN: (纸本)9783030881665;9783030881658

Modern repairing and retrofitting methods for existing structures make use of composite materials, consisting of high strength textiles and a matrix, which can be either polymeric or inorganic. These kinds of techniques are largely applied to masonry structures, since they significantly improve structural performance with a small increase of weight and a minimum invasiveness. However, the application of organic gluing agents on masonry has revealed some well-known drawbacks, which are almost all overcome resorting to inorganic matrixes, namely cement or lime mortars. An entire class of composites has been thus identified as TRM (Textile Reinforced Mortars) or FRCM (Fibre Reinforced Cementitious Matrices). Among them, Steel Reinforced Grouts (SRG) are characterized by Ultra High Tensile Strength Steel (UHTSS) cords embedded in mortar matrix and their use to improve the structural performance of existing historical masonry buildings is becoming more and more diffused. Qualification tests and acceptance criteria for SRG have been defined. SRG system has been studied in terms of mechanical characteristics, experimental application and documents on SRG properties and performances are actually available for both design and research purposes. A lot of work has been done but despite this, some aspects regarding the interaction between steel and mortar matrix systems need to be still investigated. In this document the results of an experimental campaign carried out on different SRG systems obtained varying the number of cords, the density of steel textile and the typology of mortar matrix (lime based and cementitious) are presented. Experimental investigations have been planned by means of direct tensile tests and lap tensile tests. Numerical simulations of direct tensile tests are also presented, aiming at identifying some peculiar aspects of the response of such a type of composite systems.

关键词： SRG Tensile behaviour Overlap Modelling

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Influence of Processing Conditions on the Mechanical Behavior of Mineral-Impregnated Carbon-Fiber (MCF) Made with Geopolymer 10th

Influence of Processing Conditions on the Mechanical Behavio...

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10th International Conference on Fibre-Reinforced Polymer (FRP) Composites in civil engineering (CICE)

作者： Zhao, Jitong Liebscher, Marco Schneider, Kai Junger, Dominik Mechtcherine, Viktor Tech Univ Dresden Inst Construct Mat D-01062 Dresden Germany

ISBN: (纸本)9783030881665;9783030881658

Mineral-impregnated carbon-fiber (MCF) composites are for the construction industry a promising alternative to steel reinforcement or conventional fiber-reinforced polymer (FRP) composites due to their high mechanical performance over a wide temperature range, corrosion resistance, and high technological flexibility. For an efficient industrial fabrication of MCF, a long-range processing window need to be secured for the reactive impregnation suspensions. In this regard geopolymers offer great potential since - similar to organic thermosettings - they require thermal curing to accelerate polymerization, enabling quickly high early strengths. To this end, the presented article is envisaged to study the impact of curing regimes and processing technology on the microstructure and mechanical properties of MCF. The MCFs were fabricated automated and continuously with a geopolymer-suspension and subsequently treated at elevated temperatures. Moreover, a helical winding was applied around the freshly pultruded bundle to profile the reinforcement surface, increase its "green" strength and handleability as well as its subsequent bond behavior towards concrete matrices. The produced samples were thermally "activated" at 75 degrees C for up to 8 h only, to promote the geopolymerization process. With prolonged curing, a gradual increase in flexural and tensile properties was observed, confirmed by microscopic analyses showing a more reacted matrix microstructure with 8 h of curing time. The applied helical winding yielded a slight decrease in flexural performance, but densified the matrix microstructure of the MCF, proven by mercury intrusion porosity measurements. Finally, uniaxial tensile tests presented that the mechanical properties of such produced MCF reinforcements are in the same range as conventional FRPs.

关键词： Carbon-fiber composite Mineral impregnation Geopolymer Automated processing

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Optimising CFRP Recycling via Arrhenius-Type Kinetic Behaviour Analysis 10th

Optimising CFRP Recycling via Arrhenius-Type Kinetic Behavio...

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10th International Conference on Fibre-Reinforced Polymer (FRP) Composites in civil engineering (CICE)

作者： Wei, Y. Hadigheh, S. A. Univ Sydney Fac Engn Sch Civil Engn Sydney NSW 2006 Australia

ISBN: (纸本)9783030881665;9783030881658

Pyrolysis method is one of the promising methods which can be used for reclaiming of clean carbon fibres from CFRP composites. To further improve this recycling method, kinetic behaviour of CFRP decomposition needs to be investigated. By monitoring and analysing the weight loss of CFRP during thermal degradation, the activation energy (E) of composites is determined by Arrhenius-type model-free (Friedman method) and curve fitting methods (Coats-Redfern method). Results show that the decomposition of the CFRP is a complex two-stage reaction. During the first stage, approximately 75% of epoxy matrix is removed. In this stage, pyrolysis of composite remains efficient up to around 425 degrees C where above 55% of resin is removed. Within this temperature range, analysis of kinetic energy confirms that a higher conversion rate and lower activation energy can be achieved by using lower heating rate. The outcomes contribute to optimisation of design parameters and development of highly efficient and cost effective CFRP recycling method using pyrolysis technique.

关键词： CFRP recycling Pyrolysis Thermal degradation Activation energy Arrhenius-type kinetic behaviour

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Introducing Safety on Construction Industry Along with Lean Construction Hypothesis

Introducing Safety on Construction Industry Along with Lean ...

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International Conference on Advances in Construction Materials and Management (ACMM)

作者： Anandh, S. Nachiar, S. Sindhu Abeshek, C. S. Sai Mariappan, Preethiba SRM Inst Sci & Technol Dept Civil Engn Chengalpattu 603203 Tamil Nadu India

ISBN: (纸本)9789811658396;9789811658389

The construction industry being a very competitive sector throughout the world, the companies mainly aim in giving an outstanding outcome without any obstacles. From the journals studied, it was analyzed that the main obstacles faced by the industries are due to unexpected accidents which eventually affect the work operation and which can be controlled by introducing safety abstraction along with lean construction ideology. The paper mainly aims in the development of a methodology that can be practiced which helps in the enhancement of safety in the construction industry when lean concepts are implemented, which eventually reduces the accidents in the construction. It is found that by implementing lean construction concepts, the safety in the construction industry has been increased thus reducing the accidents on the construction site which enhances the productivity of the company providing the required outcome.

关键词： Safety Construction Accidents

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