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

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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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Flexural Analysis and Optimized Design Software for Reinforced Concrete Beams Strengthened with NSM or Externally Bonded FRP 10th

Flexural Analysis and Optimized Design Software for Reinforc...

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

作者： Rasheed, Hayder A. Abouelleil, Alaaeldin Kansas State Univ Dept Civil Engn Manhattan KS 66506 USA AEDA LLC Adv Engn Design Apps Manhattan KS 66503 USA

ISBN: (纸本)9783030881665;9783030881658

The flexural strengthening techniques of reinforced concrete beams using Externally Bonded (EB) FRP sheets or Near Surface Mounted (NSM) FRP bars have been very well established. The technology transfer has taken place into engineering design practice for two decades now through the introduction of design guidelines. However, the lack of design software in the market as well as the limited academic education of present engineers has been an obstacle against the wide spread of this technology as a preferred alternative for repair and strengthening. Recently, a US-based group has responded to this need by developing professional interactive software to analyze and design structural elements strengthened with FRP. One of the very first products that came out of this effort was the development of a detailed analysis and design tool on strengthening of RC beams. This software complies with the provisions of ACI 440.2R-17 and is available interchangeably in SI and US customary unit systems. It is capable of analyzing rectangular, T and inverted L sections strengthened with externally bonded FRP or NSM bars. It allows for one compression layer and three tension layers of steel and provides strength and serviceability calculations. It has a graphics tool for to-scale drawing of sections, and it offers a detailed professional design report. The premium version is equipped with a graphics based optimized design feature that eliminates the need to perform design iterations. Its user-friendly interface is an asset to any design office.

关键词： Design tools Flexural strengthening RC beams FRP sheets NSM bars

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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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SCS Curve Number to Model Flooding in the Upper St. Johns River Using Retrieved Remotely Sensed Precipitation from NEXRAD, and TRMM 1

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

作者： Kheimi, Marwan King Abdulaziz Univ Fac Engn Rabigh Branch Dept Civil Engn Jeddah 21589 Saudi Arabia

ISBN: (数字)9789811679209

ISBN: (纸本)9789811679209;9789811679193

The economy, environment, and society are heavily impacted by precipitation during floods, and droughts events. Recent technological advancements in satellite-retrieved, and radar precipitation products showed better resolution and coverage that resulted to sustainable data collection. Nevertheless, uncertainty and lack of consistency in information records can portrays a weakness while incorporation retrieved estimate and operational decision making. In this paper, the goal is to evaluate. Hydrologic Modeling System (HEC-HMS) to simulate one flood event to investigate the effect of watershed subdivision. The Model utilized satellite products rainfall estimator (TRMM 3B42) and NEXRAD Stage HI in the Upper St. Johns River, located in the Mid-Eastern part of Florida. While taking into consideration extreme event in August 2008. The data were collected from 5 local precipitation gages in the St. Johns River District. Using validation metrics, this data was aggregated and differentiated between in-situ based rainfall, radar, and satellite derived rainfall. The detected rainfall amounts and volume of correctly identified precipitation, NEXRAD Stage provides a better possibility for accurate estimation and variability of precipitation at this high spatial resolution. In fact, the simulation results show less accuracy in predicting flow in the study area, but overestimation in the regions. Although comparable to radar-only simulations in terms of magnitude and time-to-peak, there is no discernible improvement in predicting these quantities.

关键词： Precipitation Hydrologic modeling Satellite modeling Remote sensing

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Analysis on Recognizability and Legibility of Urban Virtual Environment in Virtual Reality Through Cognitive Maps 1

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5th International Conference on Architecture and civil engineering 2021 (ICACE)

作者： Zaini, Atta Idrawani Yazit, Raja Nur Syaheeza Raja Goh, Nurakmal Abdullah Gregory, Zayn Al-Abideen Embi, Mohamed Rashid Univ Malaysia Sarawak Fac Built Environm Sarawak Malaysia Univ Teknol Malaysia Fac Built Environm & Surveying Skudai Malaysia

ISBN: (数字)9789811686672

ISBN: (纸本)9789811686672;9789811686665

Schematizing the most optimum level of details (LOD) in virtual environments (VEs) is a relevant endeavour as scale in virtual reality (VR) is not provisional but instead is locked at full scale. This paper compares recognizability and legibility of four 3D models of the same site in Melaka each with a different LOD. This informs whether different VEs' LOD can lead to different cognitive readings among respondents. Free-recall technique was used to evaluate cognitive knowledge of N = 96 respondents, with N = 24 respondents in each of the four VEs. Each respondent was asked to draw a map indicating visual cues from their minds. The cognitive maps in each treatment were then analysed using content analysis. The first coding scheme derived word frequencies to imply recognizability. The second scheme derived quality and relationships between elements to imply legibility. The contents were then compared among the different groups. We suggest that LOD may have some influence on cognitive understanding to varying degrees depending on the task and stage of navigation taken place.

关键词： Virtual environments Cognitive mapping Virtual reality Urban legibility Level of details

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Structural Performance of All-Composite GFRP Bridge Girder 10th

Structural Performance of All-Composite GFRP Bridge Girder

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

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

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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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Study of Slope Failure in North Sumatera: Case Study Medan-Berastagi Road 1

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

作者： Hastuty, Ika Puji Ahmad, Fauziah Roesyanto Asmirza, Moh Sofian Mulia, Ahmad Perwira Anas, Ridwan Univ Sumatera Utara Dept Civil Engn Dr Mansyur 58 Medan Baru Sumatera Utara 20153 Indonesia Univ Sains Malaysia Sch Civil Engn Engn Campus Nibong Tebal 14300 Pulau Pinang Malaysia

ISBN: (数字)9789811679209

ISBN: (纸本)9789811679209;9789811679193

North Sumatra is one of the areas where landslides often occur. The road along Medan-Berastagi is a landslide-prone area that has a rough topography with undulating hillside reliefs and slope angle between 60 degrees and 90 degrees. The literature on landslide susceptibility analysis in Sibolangit and Karo areas, where the two areas are located along Medan-Berastagi road, will be reviewed in this paper. This article presents summary review and classification of the main approaches that have been developed in Sibolangit and Karo as the parameters, methodologies, and tools used to obtain a landslide hazard map. The results of the review will be validated using landslide events that have occurred in 2020 by direct field observations.

关键词： Slope failure Landslide Risk Hazard Geographic Information System (GIS)

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Influence of Matrix Strength on the Pullout Behavior of High Strength Steel Fibers 6th

Influence of Matrix Strength on the Pullout Behavior of High...

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

作者： Ngoc-Thanh Tran Diu-Huong Nguyen Ho Chi Minh City Univ Transport Fac Civil Engn Ho Chi Minh City Vietnam

ISBN: (纸本)9789811671609;9789811671593

This study investigates the effects of matrix strength on the pullout behavior of steel fibers by performing single pullout test. Two types of high strength steel fibers, smooth and twisted fiber, were embedded in three different concrete matrices with compressive strengths of 28 MPa (normal concrete), 84 MPa (highstrength concrete), and 180 MPa (ultra-high-strength concrete). The results showed that twisted fibers embedded in both normal concrete and high-strength concrete produced slip hardening behavior while smooth fiber in all concrete matrices generated slip softening behavior. As the matrix strength increased, the pullout resistance of fibers increased if they could maintain pullout mode. However, the pullout resistance of twisted fiber in ultra-high-strength concrete deteriorated immediately after the fiber was broken. Twisted fibers produced higher pullout resistance in normal and highstrength concrete but lower pullout resistance in ultra-high-strength concrete than smooth fibers. Twisted fiber showed the best performance in high-strength concrete whereas smooth fiber did in ultra-high-strength concrete.

关键词： Pullout behavior Steel fiber Ultra-high-strength concrete Pullout mode . Breakage mode

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