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

共 6935 条记录，以下是4691-4700 订阅

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Application Research and Structural Optimization of Vibration Isolation of Row Piles in High-Speed Railway Based on the Concept of Phononic Crystal 4th

Application Research and Structural Optimization of Vibratio...

引用

4th International Conference on Transportation Geotechnics (ICTG)

作者： Chen, Xiaobin Tang, Hao Cent South Univ Sch Civil Engn Changsha 410075 Peoples R China

ISBN: (纸本)9783030772383;9783030772376

Phononic crystal is a new type of functional material, which can shield elastic waves at different frequencies by properly setting the parameters and distribution of constituent material. Based on the phononic crystal theory, this paper uses the finite element software COMSOL multi-physics to calculate the band gap characteristics of three-dimensional periodic row piles structure and discusses the influence of soil density, elastic modulus, radius of row piles, configuration mode and section shape. The results show that the radius of row piles and the elastic modulus of soil are the main factors affecting the band gap;the appropriate section shape can be selected according to the frequency range that one needs to shield and the amount of material that is needed to use. Compared with the periodic pile barrier in a square configuration, the pile in a triangle configuration can obtain a higher initial bound frequency, terminal bound frequency and a bigger band gap width. The research results are expected to provide some reference for the vibration isolation design of high-speed railway.

关键词： High-speed railway vibration Phononic crystal Vibration isolation performance Numerical simulation Band gap characteristics

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Structural Performance of All-Composite GFRP Bridge Girder 10th

Structural Performance of All-Composite GFRP Bridge Girder

引用

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

作者： Siwowski, Tomasz W. Rajchel, Mateusz Kulpa, Maciej Rzeszow Univ Technol Fac Civil Environm Engn & Architecture Rzeszow Poland

ISBN: (纸本)9783030881665;9783030881658

A very good application of FRP composites has been proved in case of hundreds of pedestrian bridges. However, there exists only very few of all-composite bridges that are suited for the heavy traffic load classes. The innovative idea of an all-composite girder-deck structural system for small bridges suited for the heavy traffic load classes has been proposed and experimentally tested under static and dynamic load. The all-composite bridge girder is combined with a U-shaped open box with slightly inclined webs and two top flanges and a sandwich slab bonded to the top flanges with epoxy adhesive. The composite action of both elements under service load was assumed in the design of the bridge superstructure. The top and bottom flanges of the box were made of solid GFRP composites whereas the webs were made in form of the sandwich panels with PVC foam layer in-between two GFRP laminates. The sandwich bridge deck slab consisted of two GFRP laminates and PUR foam core stiffened with the internal vertical GFRP ribs. To increase the torsional stiffness of the girder and to prevent buckling of webs, internal diaphragms were placed and bonded along the length of the girder. The most important issues in structural behavior of all-composite bridges are: girder stiffness, ultimate strength, failure mode, strength of its longitudinal adhesive joints and global safety factor. These performance characteristics of the new all-composite bridge girder have been evaluated on the basis of static load tests carried out on the full-scale model. After comprehensive laboratory testing, which had revealed expected structural performance, the girder was used in the first Polish all-composite bridge.

关键词： All-composite bridge girder Structural testing Stiffness Strength Safety factor

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Reliability Analysis of Structures Subjected to Seismic Excitation Using a Deep Learning-Based Surrogate Model 6th

Reliability Analysis of Structures Subjected to Seismic Exci...

引用

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

作者： Manh-Hung Ha Trong-Phu Nguyen Duc-Minh Hoang Viet-Hung Dang Natl Univ Civil Engn Hanoi Vietnam

ISBN: (纸本)9789811671609;9789811671593

Reliability of structures subjected to seismic loading is a persistent and challenging task as it requires performing the dynamic analysis of structures and repeating these analyses multiple times with variables sampled from predefined distributions via the Monte Carlo simulation method. Thus, this study proposed a surrogate model as an alternative for the Finite Element Method in forecasting the structure's response to earthquakes. The proposed method consists of four main steps: (i) using experimental data from the literature to calibrate a reliable numerical model, (ii) leveraging the numerical model to generate sufficient data for data-driven method, (iii) elaborating a deep learning architecture dedicated to forecasting structure's response to earthquake using the lastest advent of Deep Learning in handling time-series data, namely, self-attention mechanisms, and (iv) estimating the reliability of the structure of interest. The efficiency and effectiveness of the proposed approach are demonstrated in detail through an example of a 3D steel frame prone to ground motions, showing a reduction up to 180 fold in computational time compared to the plain Monte Carlo simulation using the conventional Finite Element Method, with less than 5% error.

关键词： Reliability analysis Earthquake Surrogate model

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Numerical Simulation of Water Impoundment at a High Arch Dam Site 1

引用

4th International Conference on Numerical Modelling in engineering (NME)

作者： Detournay, Christine Meng, Guotao Hou, Jing Xu, Jianrong Cheng, Zhao Peterson, Ryan Cundall, Peter Itasca Consulting Grp Inc Minneapolis MN 55401 USA PowerChina Huadong Engn Corp Ltd Hangzhou 311122 Zhejiang Peoples R China Hydrochina Itasca Res & Dev Hangzhou 311122 Zhejiang Peoples R China

ISBN: (数字)9789811681851

ISBN: (纸本)9789811681851;9789811681844

In a former study, water impoundment at a high arch dam (located in southwest China) was simulated using fluid-mechanical elasto-plastic analyses to predict deformation mechanisms taking place at the scale of the valley (Hou et al., IOP Conf Ser: Earth Environ Sci 570:022033, 2020). In this continuation work, we reviewthe findings, clarify themechanism of valley deformation caused by changes in impoundment level, and present the results of a sensibility study that accounts for the presence of drainage volumes at the site. With no account for drainage volumes, the model predicts valley expansion along measuring lines upstream from the dam, and valley contraction downstream. Also, valley contraction increases with measuring line elevation. Valley deformation occurs during changes of impoundment;this reflects the mechanical response to the change in dead weight of standing impoundment water. Deformation also takes place at constant impoundment level;this is caused by large-scale water seepage under and around the dam in the valley banks. A decrease in impoundment level generates a relative increase in valley contraction in the model, both upstream and downstream of the dam. This behavior is explained by the mechanical relaxation of lateral pressure that acts on the valley banks when the impoundment level is reduced. With drainage domains (associated with tunnels and powerhouse caverns) accounted for in the model, it was expected that the associated drop in fluid pressure would reduce the predicted valley contraction in the dam vicinity. Indeed, in this case, a mechanism of valley expansion is predicted to develop along all monitoring lines in the model.

关键词： civil engineering Dam impoundment Valley contraction/Expansion mechanisms Numerical study Fluid-mechanical analysis

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Numerical Investigation on the Boiling Stability of Sheet Piles Supported Excavations in Cohesionless Soil 6th

Numerical Investigation on the Boiling Stability of Sheet Pi...

引用

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

作者： Dang, Liet Khabbaz, Hadi Univ Technol Sydney UTS Sch Civil & Environm Engn Ultimo NSW Australia

ISBN: (纸本)9789811671609;9789811671593

This paper presents the findings of numerical investigations on the boiling stability against seepage failure of a sheet piled cofferdam supported excavation in cohesionless soil. Anumerical analysis based on the finite element method using both plane strain and three-dimensional model was conducted to investigate the influence of seepage force on the stability of supported excavation. The results of this numerical analysis were validated with the report data of a case study on seepage force induced boiling failure inside a sheet pile cofferdam in support of deep excavations. Subsequently, a parametric study was undertaken to evaluate further the influence of different design parameters, including size of excavations against excavated level and penetration depths, on the boiling stability by seepage force of sheet piledcofferdam supported excavations in sand. The numerical results demonstrated that the cofferdam stability against seepage failure significantly improvedwith an increase in the cofferdam size. Meanwhile, shallower sheet-pile penetration and deeper excavation level in the cofferdam base were found to have a substantial influence on the excavation base stability when the size effect of cofferdam was taken into consideration. Consequently, possible and practical solutions to improve the boiling stability of sheet pile-supported excavations are also proposed in this investigation.

关键词： Deep excavation Numerical modeling boiling failure Seepage

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Capturing the Flexibility Value of Infrastructure: A Case Example of a Road Project 6th

Capturing the Flexibility Value of Infrastructure: A Case Ex...

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

作者： Tuan Anh Nguyen Nhu Phien Nguyen Natl Univ Civil Engn Hanoi Vietnam

ISBN: (纸本)9789811671609;9789811671593

Road infrastructures have high uncertainties due to unique and longlasting characteristics, and these uncertainties, such as varied market demands, environmental and demographic changes, lead to the obsolescence of infrastructures. This creates the need for modern road infrastructures to be designed and built with a certain level of flexibility. Flexibility refers to the ability to adjust or change with future circumstances. Considering the potential case of road expansion, this paper investigates the viability of incorporating flexibility into road projects. The proposed financial valuation approach of flexible infrastructure is illustrated via the probabilistic cash flow approach of options analysis. This approach is straightforward, requires minimal financial and mathematical knowledge, and offers a practical way to create flexibility for road projects. As a case example of Lo Te-Rach Soi highway project, the paper considers incorporating flexibility on the two-stage development of a road project, adding extra lanes for road expansion. The results, calculated on the case example, show that incorporating flexibility is financially viable. Although this conclusion on the viability of flexible infrastructure cannot be drawn generally due to limitations of a particular given case example, it is shown that the proposed approach is suggestive and applicable to evaluate the flexibility value of built-in flexible infrastructure.

关键词： Flexibility Options analysis Expansion Cash flow Road project

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Public Private Partnership for Transport Infrastructure Investment: Critical Success Factors and Lessons Learnt from Projects in the Context of Developing Countries 6th

Public Private Partnership for Transport Infrastructure Inve...

引用

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

作者： Nguyen, Tiep Hallo, Leonie Gunawan, Indra Nguyen, M-Duc Ho Chi Minh City Univ Transport Ho Chi Minh City Vietnam Univ Adelaide Adelaide SA Australia

ISBN: (纸本)9789811671609;9789811671593

Public-private partnerships (PPPs) represent an important channel that attracts the participation of private sponsors to invest in transport infrastructure systems in developing countries. PPPs are increasing as an innovative tool to remedy the lack of the dynamics of traditional investment channels of public governments and to stimulate the development of transport infrastructure via the encouragement of participation by private investors. PPP projects are established based on the cooperation rules of public and private sectors on the basic of pursuing common goals;and leveraging their joint resources regarding the competencies and strengths of each actor. However, the poor quality of collaboration mechanisms between public agencies and private organizations is considered to be one of the main causes leading to project delays and the need for unexpected renegotiations, which results in unforeseeable events beyond the control of the contractual parties. Thus, this paper focuses on reviewing the implementation of PPP projects in developing countries to provide a holistic picture of PPP contractual negotiations and identify potential risks and associated consequences during the project stages. A systematic review has been conducted and more than one hundred research papers from 2000 to 2020 have been selected for analysis and synthesis. The initial findings of this study show that political support, legal-financial risk allocation, shared authority and responsibility, communication channels, and conflict resolution are critical factors contributing to the success or failure of the collaborationmechanism between parties in PPP projects. These factors should be examined carefully during investment policy development to improve the success rate of PPP projects and attract the participation of private sector investors.

关键词： Public-private partnerships Transport infrastructure Project risks

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Design of Metal Shear Panels for Seismic Protection of RC Buildings 10th

Design of Metal Shear Panels for Seismic Protection of RC Bu...

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

作者： de Matteis, Gianfranco Ferraioli, Massimiliano Raimo, Rocco Lavino, Angelo Bencivenga, Pasquale Univ Campania Luigi Vanvitelli Dept Architecture & Ind Design Via San Lorenzo I-81031 Aversa Italy Univ Campania Luigi Vanvitelli Dept Engn DI Via Roma 9 I-81031 Aversa Italy

ISBN: (纸本)9783031038136;9783031038112;9783031038105

Many studies in literature proved the excellent hysteretic behaviour of metal shear panels that exhibited large ductility and energy dissipation capacity under cyclic loading. The lack of standardized design procedures has seriously limited their use for seismic retrofitting of RC buildings. This paper develops a passive control design method for RC structures added with metal shear panels. The simplified method is based on a single-degree-of-freedom idealization and an optimum equivalent stiffness distribution to arrange the metal shear panels over the height of the building. The design method is validated through implementation in two different building cases. Its effectiveness is demonstrated through nonlinear dynamic analyses focusing on the effects of the cyclic behaviour of the metal shear panels.

关键词： RC buildings Seismic retrofit Metal shear panels Design method

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Green Smart System Based on AI for Ammonia and Hydrogen Eco-Friendly Use in Naval Transport from Protected Wetlands 1

引用

3rd International Conference on Green Environmental engineering and Technology (IConGEET) / 7th International Conference on Green Design and Manufacture (IConGDM)

作者： Deak, Gyorgy Georgescu, Tudor Banica, Cosmin-Karl Burlacu, Iasmina-Florina Urloiu, Irina Zakarya, Irnis Azura Natl Inst Res & Dev Environm Protect Bucharest IN 294 Splaiul Independentei6th Dist Bucharest 060031 Romania Hypertech SRL Giurgiu 080013 Romania Wing Comp Grp SRL Bucharest 060782 Romania Univ Malaysia Perlis Ctr Excellence Geopolymer & Green Technol CEGeoGT Sustainable Environm Res Grp SERG Kangar 01000 Perlis Malaysia

ISBN: (数字)9789811679209

ISBN: (纸本)9789811679209;9789811679193

Shipping is one of the major pressures that have a negative impact on conservation efforts in protected wetlands in Romania. Based mainly on the use of fossil fuels, shipping activities contribute significantly to water and air pollution. Reducing the carbon footprint by implementing ammonia and hydrogen on board has gained increasing interest in recent years, but innovative solutions are still needed to be competitive with traditional fuels. This paper is presented a green smart system based on Artificial Intelligence (AI) for ammonia and hydrogen eco-friendly use in naval transport. The preliminary test results showed that the proposed engine efficiency is almost over a half, thus the proposed solution is presenting a great potential of application in naval transport as a green solution towards zero CO2 emissions economy, but it requires further improvements by refining the command and control software and by introducing a control of the hydrogen gas injection.

关键词： Ammonia/hydrogen fuel cells Artificial Intelligence Electric propulsion/thermal engines Carbon-free naval transport Protected wetlands areas

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Innovation in Cements-Can We Meet Future Construction Needs Sustainably? 6th

Innovation in Cements-Can We Meet Future Construction Needs ...

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

作者： Provis, John L. Univ Sheffield Dept Mat Sci & Engn Sheffield S1 3JD S Yorkshire England

ISBN: (纸本)9789811671609;9789811671593

There has been an enormous growth in the volume and scope of technical analysis of alternative cements, accompanied by claims of "sustainability", during the past decade. Some of this growth has been accompanied by real-world actions in terms of commercialization, trials, and deployment. However, there are a very large number of lines of investigation-some of which appear extremely promising from environmental and technical perspectives-that have not yet been translated into reality. This presentation will address some of the key drivers for a sustainable future in cement technology, with a particular focus on alkali-activated materials, including comments on the pathways by which some of the evident potential of these materials can be unlocked for the benefit of society.

关键词： Cement Concrete Sustainability

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