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

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Carbon Nanotubes Strengthened Interphase in Textile Reinforced Mortar (TRM) Composites 10th

Carbon Nanotubes Strengthened Interphase in Textile Reinforc...

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

作者： Signorini, Cesare Interdept Res Ctr CRICT Via Vivarelli 10 I-41125 Modena Italy

ISBN: (纸本)9783030881665;9783030881658

Performance of inorganic matrix composite materials for structural purposes is strongly dependent on the matrix-to-fabric interphase bond strength. Consequently, owing to lack of congruence between the fabric and the matrix, design performance parameters are strongly penalised. Besides, yarn inner filaments (the core) easily slide over outer filaments (the sleeve) in the so-called telescopic failure. Broad experimental evidence supports the adoption of epoxy coatings to improve matrix-to-fabric strength and prevent telescopic failure, although the presence of the organic phase partially impairs the remarkable advantages associated to the inorganic matrix, such as thermal stability and water vapour permeability. Silica coatings appear as a promising alternative to traditional epoxy, by inducing localised pozzolanic reactivity, firmly linking synthetic fibres and hydraulic lime through the formation of highly cementing products at the interphase. In this work, the effect of a dispersion of multi-walled carbon nanotubes (MWCNT) in a silica nano-coating is assessed in uni-axial traction tests. The silica coating is prepared through sol-gel deposition in which carbon nanotubes are dispersed. The overall amount of carbon nanotubes in the silica sol is fixed at 0.5% wt. Silica-coated AR-glass and carbon fabric composite specimens, embedded in a commercially-available lime mortar matrix, are tested and compared. Carbon nanotubes provide a remarkable enhancement in both ultimate strength and elongation for AR-glass TRM, yielding an impressive two-fold increase in terms of strength. Differently, coated carbon fabrics composites show an increase up to 31% in terms of ductility, in view of an unexpected strength loss.

关键词： Textile Reinforced Mortar Silica nano-coating Carbon nanotubes Mechanical performance

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Influence of the Degree of Inclination of Applied Load on the Behaviour of Hybrid and FRP Elements 10th

Influence of the Degree of Inclination of Applied Load on th...

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

作者： Vadapolaite, Ausra Dakhel, Mohammad Donchev, Ted Kingston Univ London Dept Civil Engn London England

ISBN: (纸本)9783030881665;9783030881658

Steel Shear walls (SSW) are the common lateral resisting system around the world. Early stage research on utilising the beneficial properties of fibre reinforced polymers FRP to increase the strength and improve the behaviour of SSW systems is under way. The application of FRP in SSW systems merits review of the effect of this material on the behaviour of the connection between the hybrid steel/FRP infill plate and the boundary frame elements. An investigation of the influence of the degree of inclination of applied load on the behaviour of Hybrid and FRP connection elements was undertaken for the main scope of this research. This is so as to fully understand the effect of the inclined load on Hybrid and pure FRP connection elements and understand the material behaviour under such load. The Hybrid FRP/Steel and Pure FRP specimens were prepared using vacuum oven. 3 Hybrid GFRP/Steel, 3 Hybrid CFRP/Steel, 3 CFRP, 3 GFRP and 3 Steel specimens were prepared. The specimens size was kept constant of 120 mm width and 510 mm length. The infill steel plate of 0.8 mm thickness was used in the Hybrid specimens. The hybrid specimens were made from 4 layers of FRP and infill plate. The pure FRP specimens were made from 7 layers. The results of the tested samples showed that Hybrid/Steel GFRP and Pure CFRP has higher ultimate load and energy dissipation comparing to steel specimens. The Pure CFRP presented the highest ultimate load and energy dissipation than the rest of the specimens. After normalization by weight it was seen that CFRP performed the best in Energy dissipation and Ultimate load, giving the highest values. The Hybrid/steel GFRP Ultimate Load and Energy dissipation higher than Pure GFRP.

关键词： FRP Shear walls Infill plates Connections

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Numerical Study of the Quasi-static Cyclic Behaviour of Blind-Bolted Connections 10th

Numerical Study of the Quasi-static Cyclic Behaviour of Blin...

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

作者： de Mesquita, Afonso Trindade Bonina de Mesquita, Afonso Bonina Univ Lisbon Inst Super Tecn Lisbon Portugal Univ Coimbra Dept Civil Engn ISISE Coimbra Portugal

ISBN: (纸本)9783031038136;9783031038112;9783031038105

This paper reports on a numerical study carried out to evaluate the quasi-static cyclic response of three endplate joints using hollo-bolts and non-concrete-filled tubular columns. The present research follows an experimental program involving monotonic tests of 22 specimens, covering different sets of connections and configurations. This study introduces a numerical prevision of the behaviour of the joints' components when subjected to both tension and shear originated by a cyclic loading, indicating that without proper reinforcement, these joints cannot be used in zones with high seismicity, given their weakness. Numerical simulations using ANSYS software are compared against the experimental monotonic tests to ensure results concordance and reliability. The purpose of this paper is to present and discuss the numerical descriptions of the main response characteristics including hysteretic loops, stiffness and strength degradation, pinching effects, energy dissipation, among other structural properties. The models indicated that the HBM20 have sufficient mechanical strength, but the column's plasticity is too large to ensure a proper dynamic response when large moments are applied. However, due to their fast assembly and aesthetical design, new solutions are being implemented to increase the strength and resistance of these joints in order to meet the earthquake design requirements. The most relevant components of these joints that increase their structural properties are also mentioned. These findings allow having a deeper understanding of the behaviour of these connections in seismic scenarios and the results serve as a basis for a future experimental campaign dedicated to evaluate the dynamics of non-concrete-filled blind-bolted connections.

关键词： FEM Cyclic behaviour Endplate connection Blind-bolts

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Numerical Study of the Long-Term Settlement of Screw-Shaft Pile Reinforced Subgrade Under Cyclic Train Load 4th

Numerical Study of the Long-Term Settlement of Screw-Shaft P...

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4th International Conference on Transportation Geotechnics (ICTG)

作者： Li, Fu-Hao Zhang, Xiao-Lei Feng, Shi-Jin Tongji Univ Dept Geotech Engn Key Lab Geotech & Underground Engn Minist Educ Shanghai 200092 Peoples R China

ISBN: (纸本)9783030772383;9783030772376

High-speed railways (HSR) set strict limits on subgrade settlement. Excessive settlement, especially the differential settlement at the transition part between viaduct lines and embankment lines, could lead to discomfort on HSR trains and even accidents like derailments. Thus, proper ground treatment measures are inevitably needed. Screw-shaft pile reinforced subgrade was adopted in the transition section of Yancheng-Nantong HSR. However, limited research has been done to investigate the performance of screw-shaft pile reinforced subgrade. In this paper, numerical models were established to analyze the performance, especially the long-term settlement, of the reinforced subgrade. It was found that shaft-screw pile reinforced subgrade could control the long-term settlement better than the traditional shaft pile subgrade. The advantage becomes greater when the train speed increases. Moreover, the application of shaft-screw pile reinforced subgrade could reduce the material usage by about 10%. Briefly, shaft-screw reinforced subgrade could satisfy the settlement control requirements and achieve greater cost efficiency in sandy subgrades.

关键词： Shaft-screw pile Reinforced subgrade Long-term settlement Dynamic train load

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A Study on the Assessment of Risk Management in High-Rise Buildings

A Study on the Assessment of Risk Management in High-Rise Bu...

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

作者： Raamkumar, J. S. Indhu, B. SRM Inst Sci & Technol Dept Civil Engn Kattankulathur 603203 Tamil Nadu India

ISBN: (纸本)9789811658396;9789811658389

Construction activities in general, high-rise building construction in particular, come with a variety of risks. The reason for the enhanced risk factors could be attributed to the complexity and dynamic nature of the construction work involving high-rise buildings. Construction activities in high-rise buildings accounts for the majority of the accidents every year. In this work, an effort is taken to accurately assess and analyze different risk management factors like Physical Factors (PF), Organizational Factor (OF), Work Environment (WE), Safety Environment (SE), Design Factors (DF), Safety Protection (SP), Safety Behavior (SB), and Quality Factor (QF) in the construction of high-rise buildings in Chennai, Tamil Nadu. The study used quantitative survey method to collect the data from the key stakeholders. To study the influence of different risk management factors, 250 responses from construction personnel, clients, contractors and consultants were collected and analyzed using statistical tools. The reliability analysis show that all the risk management factors have Cronbach's Value above 0.7, indicating that the factors are reliably measuring the underlying constructs. The results of the empirical analysis show that work environment is the most dominant factor affecting the risk management in construction projects based on the mean value. Based on the CFA-SEM analysis, it is inferred that all the factors like Work Environment (WE), Physical Factors (PF), Organizational Factor (OF), Safety Environment (SE), Design Factors (DF), Safety Behavior (SB), Quality Factor (QF), and Safety Protection (SP) contributes significantly to the Risk Management Factors at 0.01 level. CFA Analysis shows that Design Factors (B = 0.880), Physical Factors (B = 0.866) and Safety Environment (B = 0.847) have significant contribution toward Risk Management Factors at 0.01 level. The findings of the study have several implications for managing risk factors in the high-rise building const

关键词： Construction safety High-rise building projects Risk management factors

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Laboratory Model Test of Eco-Concrete Slab Slope Protection 8th

Laboratory Model Test of Eco-Concrete Slab Slope Protection

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8th International Conference on civil engineering (ICCE)

作者： Chen, Hao Wang, Fengchi Xu, Gang Guo, Lilong Shenyang Jianzhu Univ Sch Civil Engn Shenyang Peoples R China

ISBN: (纸本)9789811912603;9789811912597

In order to study the protective effects of eco-concrete slope and the influencing factors of eco-concrete slope deformation. The displacement characteristics and ultimate bearing capacity of the slope model under different geometric parameters are obtained through the laboratory model test of eco-concrete slope protection, and the influence laws of slope deformation under different protection slope conditions are summarized, as well as the influence laws of soil compaction, soil moisture content and slope ratio on the horizontal displacement restraint capacity and stability of the slope. Compared with the unprotected slope, the ultimate load of the reinforced concrete slab slope and the ordinary concrete slab slope are increased by 2.2 times and 2.4 times respectively, and the horizontal displacement restraint capacity of the slope is increased by 29.3% and 51.6% respectively. The moisture content, compactness and slope gradient of slope soil have a certain influence on the deformation restraint capacity of slope protected by vegetation concrete slab.

关键词： Eco-concrete Moisture content Compactness Slope gradient

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Evaluating on Time Performance of Urban Bus Services in Southern States of Peninsular of Malaysia 5th

Evaluating on Time Performance of Urban Bus Services in Sout...

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

作者： Abu Bakar, Muhammad Fadhlullah Norhisham, Shuhairy Azman, Tengku Nor Azeruddin Tengku Nor Saad, Noorazizun Mohd Azlan, Nor Najwa Irina Mohd Shkuri, Nur Syafiqah Mohd Yukawa, Sotaro Syamsir, Agusril Univ Tenaga Nas Coll Engn Kajang 43000 Selangor Malaysia Univ Tenaga Nas Coll Comp & Informat Kajang 43000 Selangor Malaysia Univ Tenaga Nas Coll Energy Econ & Social Sci Kajang 43000 Selangor Malaysia Univ Tenaga Nas IEI Kajang 43000 Selangor Malaysia Osaka Univ Commerce Fac Econ 4-1-10 Mikuriya Higashiosaka Osaka 5778505 Japan

ISBN: (纸本)9789811686672;9789811686665

Rapid urbanization had given a big impact on continuous development and major expansion of urban and population. As the number getting population getting increase caused the amount of traffic on the road. High number of traffic users in urban area were increase tremendously and caused a huge traffic impact particularly during weekday. Then, the bus services should be assessed on operation aspects on the punctuality which also known as on time performance of bus service in urban area. Therefore, this paper will present the study of evaluating the on-time performance of urban bus services in southern state Peninsular of Malaysia. The data of on time performance have been taken at main terminal at capital city of each states such as, Johor Bahru, Bandaraya Melaka and Seremban. Transit Capacity and Quality of Service Manual (TCRPM) has been stated as a specific guidelines and key indicators to determine and analysed the quality service of bus performance in selected area. There was one focused in this study specific areas would be focused on these studies namely on time performance factors attributes. The results shows that the total of departure in Johor Bahru, Bandaraya Melaka and Seremban were 652, 135 and 200 respectively. Meanwhile, percentage of on time departure daily in Johor Bahru, Bandaraya Melaka and Seremban were 66.17%, 56.15%, and 71.04% respectively. The average of percentage of on time departure daily for all routes were 71.04%. The mean of quality of service (QOS) of on time performance for Johor Bahru, Melaka and Seremban were classified as a QOS E, E and D respectively. Operators should monitor the on-time performance for bus services to ensure the passenger's trustworthiness and satisfaction towards bus services remined at the optimum level. Proper information should be installed at the bus terminal in order passenger and users always updated on routes information such as schedule, departure lane, and etc. The output of this studies can be used by op

关键词： Urban bus services Quality of services On time performance

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Finite Element Analysis of Impact Load on Reinforced Concrete 6th

Finite Element Analysis of Impact Load on Reinforced Concret...

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

作者： Singh, Indrajeet Dev, Nirendra Pal, Shilpa Visalakshi, Talakokula Delhi Technol Univ Dept Civil Engn Delhi India Bennett Univ Dept Civil Engn Greater Noida India

ISBN: (纸本)9789811671609;9789811671593

Over the past few years, studies have been carried out on cement less geopolymer concrete due to its substantial reduction in carbon footprint. Limited literature is available about impact resistance of geopolymer reinforced concrete. This study focuses on low and high-velocity impact simulations on reinforced concrete(RC) beam and slab. A spherical ball of standard size has been used as an impactor. The impact load has been applied on the conventional and geopolymer reinforced concrete beam and slab, and the deformation responses of these specimens have been analyzed. ANSYS Explicit Dynamics 19.2 software was used for the finite element analysis of the specimens. The findings show that the geopolymer concrete shows better performance against impact resistance.

关键词： Finite element Low and high velocity impact Geopolymer concrete

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Numerical Analysis of a Novel Circular Anchor System for Prestressed CFRP Plates 10th

Numerical Analysis of a Novel Circular Anchor System for Pre...

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

作者： Dai, Shaolei Liu, Yue Tan, Cheng Han, Song Shang Horse Construct Co Ltd Shanghai Peoples R China Beijing Univ Technol Coll Architecture & Civil Engn Beijing Peoples R China

ISBN: (纸本)9783030881665;9783030881658

Prestressed carbon fiber reinforced polymer (CFRP) has been proved effective on flexural strengthening and crack repairing of reinforced concrete beams. Various types of anchor systems were develop for prestressing CFRP composites. However, few studies were conducted for thick and wide CFRP plates. Under this background, a novel circular anchor system for popular 3 by 50 mm CFRP plates was developed and tested. Experimental results showed that the novel circular anchor system had a capacity of 297 kN, which is higher than those with small sections, and a 80% usage of CFRP tensile strength was achieved. The capacity of circular anchors is significantly affected by magnitude of interference, tooth pattern and wedge angles. A non-linear finite element model was developed to investigate mechanical performance of circular anchor system. Parameter study was performed to optimize the design of the new anchor system. Numerical results showed that wedge angle and tooth pattern dominated the failure mode and anchor strength of circular shaped anchor system.

关键词： Presstressed CFRP Anchorage system Circular wedge Numerical analysis

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Development of Deep Learning Neural Network for Estimating Pile Bearing Capacity 6th

Development of Deep Learning Neural Network for Estimating P...

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

作者： Tuan Anh Pham Duy Hung Nguyen Hong-Anh Thi Duong Univ Transport Technol Hanoi 100000 Vietnam

ISBN: (纸本)9789811671609;9789811671593

Accurate determination of bearing capacity is one of the key issues in pile foundation design. However, the estimation of the pile bearing capacity base on in-site test methods showed time-consuming and costly. Thus, the main object of this study is to applyMachine Learning (ML) method, namely Deep Neural Network (DNN) to predict the axial load capacity. Atotal of 472 static pile load test reports collected from constructions in Ha Nam province were used to build the model in which ten factors and the destructive load on the pile head is considered the single output variable. The original data is divided into three parts, including the training set (60%), the validation set (20%), and the testing set (20%) to build, validate, and test the model respectively. In particular, the best DNN model architecture is determined by a grid search technique. To verify the performance ofDNNmodels, various methods named root mean squared error (RMSE) and R-squared (R2) were used. The results showed that the DNN model of two hidden layers achieved superior performance (average R2 = 0.897, RMSE = 108.515) in the prediction of pile bearing capacity compared to other DNN network architectures. This study can offer pile foundation design engineers an effective tool to quickly predict the axial load capacity of the driven piles.

关键词： Deep neural network Axial bearing capacity of pile Grid search technique

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