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

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Torsional Behavior of Reinforced Concrete Members Wrapped with CFRP Sheets 10th

Torsional Behavior of Reinforced Concrete Members Wrapped wi...

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

作者： Lenwari, Akhrawat Soysak, Siwakorn Thongchom, Chanachai Chulalongkorn Univ Fac Engn Dept Civil Engn Composite Struct Res Unit Bangkok 10330 Thailand Thammasat Univ Thammasat Sch Engn Dept Civil Engn Pathum Thani 12120 Thailand

ISBN: (纸本)9783030881665;9783030881658

This paper presents the torsional behavior of reinforced concrete (RC) members fully wrapped with carbon fiber-reinforced polymer (CFRP) sheets. A total of twelve rectangular RC specimens of identical cross sections were tested under pure torsion (beams) or combined axial compression and torsion (columns). In the case of column specimens, an axial force simulating the service loads was applied before CFRP strengthening and maintained constant during the static test under torsion. The magnitude of axial force was 25% of the nominal compressive strength. Therefore, test variables included the presence of axial force (beam or column), stirrup spacing (75 or 150 mm), hook angle (90 or 135 degrees) of the closed stirrups, and presence of CFRP sheets. Test results showed that the externally bonded CFRP sheets significantly increased the cracking, yielding, and maximum torsional moment capacities of RC beams and columns. The full wrap configuration enhanced the maximum torsional moment capacity by up to 190% and 116% for RC beams and columns, respectively. Also, the use of 135-degree hook for closed-stirrups was more effective than 90-degree hook for both unwrapped and CFRP-wrapped members. Finally, the effective CFRP strain equation by fib 1 4 correlated better with RC beams than columns.

关键词： Torsion Fiber-reinforced polymers Strengthening Reinforced concrete members Full wrapping

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Modelling Residential House Pricing Using Regression Analysis

Modelling Residential House Pricing Using Regression Analysi...

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

作者： Sridhar, M. B. Sathyanathan, R. SRM Inst Sci & Technol Dept Civil Engn Kattankulathur 603203 Tamil Nadu India

ISBN: (纸本)9789811658396;9789811658389

The paramount ingredient for the socio-economic development of any country is the land and buildings. An accurate appraisal of these land and buildings' value has a colossal effect on the state's economy. Still, the value of these buildings has been outrageous with realtors' emergence. Various computational techniques have been employed to resolve the issue of the appraisal of the value. The factor analysis, correlation analysis and linear regression analysis are employed in this paper in order to model the residential house prices. This study is to be carried out in the Chengalpattu neighbourhood, where the modelling of the residential house prices is considered. All the factors which account for house price were determined. The modelling is performed by taking the market prices and the various factors that account for the valuation using various software.

关键词： House pricing Regression Urban density

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Mechanical Characterization of GFRP Through Experimental Dynamic Testing 10th

Mechanical Characterization of GFRP Through Experimental Dyn...

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

作者： Beserra, Jesse Gaspar, Cassio Cardoso, Daniel Pontifical Catholic Univ Rio de Janeiro Dept Civil & Environm Engn Rio De Janeiro Brazil

ISBN: (纸本)9783030881665;9783030881658

The use of pultruded glass-fiber reinforced polymer (GFRP) has increased in recent years, with important applications for footbridges, bridge decks, cooling towers, among other. The mechanical characterization of GFRP in terms of elastic properties is often carried out by means of destructive static tests specified in international standards, but it may be a quite tedious activity given the number of properties to be determined. An alternative approach consists in the use of non-destructive techniques based on dynamic testing, also known as experimental modal analysis (EMA). This work aims to identify the dynamic properties of thin-walled GFRP members regarding their natural frequencies, mode shapes and damping ratios. These experimental dynamic characteristics obtained for a C-channel beam are, then, used to determine specific material elastic properties back-calculated using numerical optimization process. It is shown that the properties determined through dynamic testing are in relatively good agreement with those obtained from classical destructive tests. This non-destructive technique is an alternative approach for the mechanical characterization of GFRP members, especially important for low cost in situ quality control.

关键词： Glass-fiber reinforced polymer Dynamic testing Experimental modal analysis Mechanical characterization

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Quality Control & Field Guidelines for Using Non-identical Mixed GPS in Surveying Project: EGYPT Case Study Antennas 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： Hosny, Mohamed M. Ayaad, Samy Elwany, Mohamed H. El-Ghazouly, Hassan G. King Abdulaziz Univ Civil & Environm Engn Dept Jeddah Saudi Arabia Alexandria Univ Dept Transportat Alexandria Egypt

ISBN: (数字)9789811679209

ISBN: (纸本)9789811679209;9789811679193

Nowadays, GNSS accuracy has reached a level where the remaining error sources could be identified as the effect caused by phase center variations (PCV) of the antenna. The correction of PCV effect is generally important for GNSS observations and should be greatly considered when using mixed antenna design. Mixed antenna usage within the same project may degrades the observations accuracy severely. This research shows that using mixed antennas within the same projects may degrades the 3D coordinates accuracy severely. A certain combination and field guidelines for the study case are outlined within this research.

关键词： GNSS Quality control Quality assurance Mixed antennas

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Cost Analysis of Different Scenarios for Extracting Groundwater Contamination 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 Salamah, Sultan K. Hassan, Mohd Ikhmal Haqeem King Abdulaziz Univ Fac Engn Rabigh Branch Dept Civil Engn Jeddah 21589 Saudi Arabia Taibah Univ Fac Engn Dept Civil Engn Madinah Saudi Arabia Univ Tun Hussein Onn Malaysia Fac Civil Engn & Built Environm Batu Pahat 86400 Johor Malaysia

ISBN: (数字)9789811679209

ISBN: (纸本)9789811679209;9789811679193

Groundwater is an essential product for arid and semi-arid with dry climate region. The essence of groundwater is portrayed in areas where is low precipitation amount is occurred. Therefore, protecting the recharged aquifer from contamination plays a huge role to provide clean and easy to use pumped water for agricultural, industrial, commercial, and public use. In this paper, a conceptional of different scenarios is used to minimize the cost of extraction and transported plume pollutants from groundwater. The Interactive Groundwater model (IGW) has been implemented in Volusia County, north of Orlando area by utilizing parameters of hydraulic conductivity, storativity (specific yield) and layers depth from the SSURGO soil database. Also, the results of the model were compared with USGS groundwater levels from nearby well. The flow rates are grounded on the hydraulic conductivities (K), which have an initial average value of 11.3 m(3)/day, and it is randomly varied throughout the domain using spectral distribution function, the thickness (b), and the hydraulic gradient (h) comprises the boundary conditions for the modeled area. Three different scenarios have been adopted based on the EPA technical report to seek cost efficient and realistic scenario of removing pollutants. The model has depicted that the best-case scenario to implement is three injection wells and two pumping wells to get the best results needed.

关键词： Groundwater modeling Groundwater contamination Plume transport

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Research on Improvement Calculation Method of Design Thrust of Anti Slide Pile 1

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8th International Conference on civil engineering (ICCE)

作者： Hou, Xiaoqiang Liu, Jierui Wang, Xinfei Zhou, Zhongren Jia, Honglu Lanzhou Jiaotong Univ Sch Civil Engn Lanzhou 730070 Peoples R China China Construct Rd & Bridge Grp Co Ltd Shijiazhuang 050001 Hebei Peoples R China

ISBN: (数字)9789811912603

ISBN: (纸本)9789811912603;9789811912597

At present, based on the transfer coefficient method, most of the anti-slide pile design thrusts are calculated by the overload method and the strength reserve method respectively. Many algorithms only consider the remaining sliding force behind the pile and the safety factor that meets the requirements of the design conditions. Generally, the safety factor is the safety factor of the sliding slope behind the pile after the anti slide pile is reinforced. For the entire landslide, there are two safety factors before and after the pile, which is not the design safety factor target value, and there is a big difference between the safety factor and the treatment goal required by the specification. Through the study of the pile-soil interaction of anti-slide piles, it is believed that in addition to the active residual sliding force transmitted by the blocks behind the pile, the anti-slide piles are simultaneously subjected to the passive residual anti-sliding force transmitted upwards by the blocks in front of the pile. The stress analysis shows that: Firstly, according to the different active and passive properties of anti-sliding force transmission and sliding force transmission, the mechanical model of anti-sliding force transmission is studied, and the calculation formula of anti-sliding force transmission coefficient is derived;Secondly, It is believed that the anti-slide pile provides horizontal thrust to the landslide, and two components of the sliding surface direction and the vertical sliding surface direction are generated. The balance equation is established and the overload method and the strength reserve method of anti-slide pile thrust calculation formula are derived;Thirdly, according to the principle of setting piles in the anti-slip section, the optimal location of anti-slide piles are proposed;Fourthly, after verification of cases, the safety factors before and after the piles calculated by the overload method are basically equal, and consistent with t

关键词： Anti-sliding pile Design thrust Anti-sliding force transmission coefficient Location selection condition Safety factor

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Experimental Study on Flexural Behaviour of ECC-Concrete Composite Beams Strengthened with Carbon Fiber Sheet 10th

Experimental Study on Flexural Behaviour of ECC-Concrete Com...

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

作者： Tang, Rong Wang, Yi Ge, Wenjie Yan, Weihua YangZhou Univ Coll Civil Engn & Sci Yangzhou 225127 Jiangsu Peoples R China

ISBN: (纸本)9783030881665;9783030881658

In order to study the flexural behaviour of steel reinforced engineered cementitious composite (ECC)-concrete composite beams strengthened by carbon fiber sheet (CFS). Totally 12 ECC-concrete composite beam specimens with three types of ECC height replacement ratios strengthened by different layers of sheet and anchorage method (with and without CFS hoops) were made and their static flexural performance tests were conducted. The effect of layers of CFS, ECC height replacement ratio and anchorage method on the bearing capacity, deflection, crack and failure mode of strengthened ECC-concrete composite beams were investigated. The test results show that compared with the unstrengthen beams, the crack width of strengthened ECC-concrete composite beam and the bearing capacity increased by 63% with the increase in the number of reinforced layers. The ultimate bearing capacity of the beams strengthened with CFS hoops increased by 8.6% when compared with that of counterpart without CFS hoops.

关键词： Carbon fiber sheet (CFS) Engineered cementitious composite (ECC) Concrete Composite beam Flexural behaviour

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Sustainable Rice Supply Chain Management in the Mekong Delta of Vietnam: The Role of Regional Rice Logistics Centre 6th

Sustainable Rice Supply Chain Management in the Mekong Delta...

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

作者： Nguyen Thi Binh Bui Thi Ly Foreign Trade Univ 91 Chua Lang Hanoi Vietnam Foreign Trade Univ 91 Lang Thuong Hanoi Vietnam

ISBN: (纸本)9789811671609;9789811671593

The study aims at investigating and assessing the impacts of the logistics centre on sustainable development of the rice supply chain in the Mekong Delta of Vietnam. In order to achieve these objectives, the current situation of rice logistics including the overall supply chains from production in theMekong Delta to consumption is described. Potential rice logistics centre in the context the Mekong Delta will be compiled, and the importance of this measure is examined by conducting an expert interview survey based on theMulti-Criteria Assessment (MCA) method. According to the results, the initiative of establishing a rice logistics centre located close to the centralized rice production areas in theMekong Delta is expected toward more inland waterway use, thereby reducing the number of ton-km for road. In addition to this, the intervention would improve remarkably the social-economic efficiency through reducing total logistics cost and emission cost for the rice industry of Vietnam.

关键词： Rice supply chain management Impact assessment Multi-criteria assessment method

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Factors of Obsolescence Affecting Adaptively Reused Shophouses in the Core Zone of Melaka, Malaysia 1

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

作者： Ab Rashid, Nor Syahila Heath, Tim Univ Sains Islam Malaysia USIM Fac Engn & Built Environm Dept Architecture Bandar Baru Nilai Nilai 71800 Negeri Sembilan Malaysia Univ Nottingham Fac Engn Dept Architecture & Built Environm Univ Pk Nottingham NG7 2RD England

ISBN: (数字)9789811686672

ISBN: (纸本)9789811686672;9789811686665

Fast economic growth and restructuring has resulted in a large number of obsolete buildings in large cities. Many of these buildings represent different eras and building typologies. Some, such as the distinctive shophouses of Southeast Asia, are important heritage legacies. The desire to undertake research related to the obsolescence of shophouses arises from the abandonment and demolition of many of these unique urban assets. Consequently, the aim of this paper is to examine the dimensions of obsolescence in adaptively reused shophouses in the Core Zone of Melaka. This research uses qualitative method through semi-structured interviews to gather information from three case study buildings. These three case study buildings were made up of shophouses which were converted into boutique hotels. NVivo software was employed to assist analysis for the collected data. The research findings indicate that functional and social obsolescence are the most dominant factors influencing all of the case study buildings. Further research is required to find the best formulas for revitalising and converting obsolete shophouses in this area for suitable uses, as this can inform policy and the success of the adaptive reuse of shophouses in the future.

关键词： Building obsolescence Adaptive reuse Traditional shophouses Melaka world heritage site Core zone of Melaka

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Bond Performances of SRG Composites: Experimental and Numerical Investigation 10th

Bond Performances of SRG Composites: Experimental and Numeri...

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

作者： Ombres, Luciano Verre, Salvatore Univ Calabria Dept Civil Engn Arcavacata Di Rende Italy

ISBN: (纸本)9783030881665;9783030881658

The Steel Reinforced Grout (SRG) composite system represents a newly developed promising technique for strengthening existing reinforced concrete and masonry structures. The SRG composite was comprised of steel fiber strips embedded within two layers of inorganic matrix. Nevertheless, the matrix is responsible for the stress-transfer in composites. The experimental results present in literature show a slippage of the fibers and fracture of the external matrix layer at the fiber-matrix interface. This is a critical phenomenon in structural strengthening applications. The present paper presents the results of an experimental and numerical investigation on the bond performances of the SRG system bonded to concrete substrate. The FE analysis was developed using Abaqus-code with a bond slip model present in literature. In addition, the aim of the FE analysis was to predict the behavior of concrete joints strengthened with SRG composites. The parameters of the bond slip model law were calibrated on the results of the experimental campaign. The experimental campaign was focused on the concrete joint strengthened with SRG, in particular, the tests were conducted by a single lap direct shear test varying the bonded length. Finally, the comparison between the numerical and experimental curves was carried out in terms of peak load.

关键词： Numerical model SRG Direct shear test/bond Concrete joints

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