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Structural Performance For Wide-Shallow Beam In Shear (Comparative Study), Behiry, R. Oct 2023

Structural Performance For Wide-Shallow Beam In Shear (Comparative Study), Behiry, R.

Journal of Engineering Research

Many floor systems contain wide shallow beams to carry floor loads and transfer it to columns. For example, in bridge construction, a system of wide shallow beams (WSBs) may provide a simple and economical system to transfer loads from the slab deck to columns. In many of these design situations, it is often advantageous to use different member widths to minimize reinforcement conflicts and reduce overall congestion. This geometrical peculiarity deserves some attention and caution while dealing with the behaviour at ultimate limit states for shear and flexure. Seven wide-shallow beams with edge columns specimens were used to investigate the …

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Performance Of A Pyramid Solar Still With Stepped Trays: Experimental Approach, Ismail, M. Oct 2023

Performance Of A Pyramid Solar Still With Stepped Trays: Experimental Approach, Ismail, M.

Journal of Engineering Research

The present experimental work aims to enhance the daily productivity of solar stills. A stepped pyramidal still with three trays was fabricated and tested under Tanta conditions, Egypt in September 2016. The still was tested with the brine feed being uninterrupted in one experiment, and with intermittent brine supply in another experiment. For continuous brine supply, the accumulated distillate was 4.95 L. For intermittent brine supply, the accumulated distillate was 4.6 L. Per unit total area, the average daily distillate water productivity is 5.5 and 5.11 L/m2 for the continuous and the intermittent feed stills, respectively. In the two ways, …

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Automated Optimization Of Centrifugal Compressors “Eckardt Rotor O”, Khalil, Mohamed Oct 2023

Automated Optimization Of Centrifugal Compressors “Eckardt Rotor O”, Khalil, Mohamed

Journal of Engineering Research

Centrifugal compressors play an important role in many industries. Improving the efficiency of centrifugal compressors and extending their range has been an important subject for both engineers and researchers working in the turbomachinery field. This paper discusses the optimization of Eckardt O impeller through changing its blade angles distribution to increase its efficiency. the optimization process is performed using an automated procedure performed within ANSYS workbench. The geometry is parameterized using ANSYS design modeler, the mesh is generated using ANSYS Turbogrid and steady flow CFD results are obtained using ANSYS CFX. Optimization by genetic algorithm is done using a surrogate …

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Experimental Study Of Cotton Stalks Gasification In A Downdraft Reactor, Rabea , Karim Oct 2023

Experimental Study Of Cotton Stalks Gasification In A Downdraft Reactor, Rabea , Karim

Journal of Engineering Research

Biomass gasification process is considered a promising waste-to-energy conversion technique to eliminate the immense environmental issues accompanied with open field burning. The objective of this study is to experimentally study the dynamic behavior of an Imbert based design manufactured bench scale gasifier using cotton stalks as a feed stock. Air was employed as a gasifying agent with a biomass batch feed of 4 kg. The gasification process characteristics are evaluated in terms of lower heating value, gasification efficiency, and operation time. The applied air flow rates are (60, 100, 150, and 200 l/m) achieving varied equivalence ratios between 0.362 – …

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Numerical Study For Performance Evaluation Of Plastic Solar Air Heater With Different Cross-Sectional Configuration, Ebied, E. Oct 2023

Numerical Study For Performance Evaluation Of Plastic Solar Air Heater With Different Cross-Sectional Configuration, Ebied, E.

Journal of Engineering Research

In this research, a numerical investigation was performed on five solar air heaters with different cross-sectional shape to find the best configuration relevant to thermal performance. The selected tested shapes in this study were (circular, semi-circular, half-circle plus isosceles triangle, half circle-negative isosceles triangle shape and crescent shape) and all tested shapes hade the same absorber surface area. The effect of two parameter (velocity and solar radiation intensity) on thermal performance of solar air heater were studied numerically by ANSYS 14.0. The velocity of air was changed from 0.25 to 2.0 (m.s -1 ). Results indicated that the highest efficiencies …

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Tennessee Labor Market Report, August 2020, Goods-Producing & Service-Providing Employment, Tennessee. Department Of Labor & Workforce Development. Oct 2023

Tennessee Labor Market Report, August 2020, Goods-Producing & Service-Providing Employment, Tennessee. Department Of Labor & Workforce Development.

Labor Market Reports

No abstract provided.

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Why The Optimal Long-Run Tax Rate On Capital Is Zero . . . Or Very High: The Missing Explanation, Chris William Sanchirico Oct 2023

Why The Optimal Long-Run Tax Rate On Capital Is Zero . . . Or Very High: The Missing Explanation, Chris William Sanchirico

Florida Tax Review

Judd’s (1985) finding that the optimal long-run rate of tax on capital is zero—even if equity is an important social objective—has exerted substantial influence in academic and policy circles over the last several decades. Only very recently has it become clear that Judd’s zero-tax result rests on an implicitly adopted assumption about how savings responds to taxation. Working within the very same model structure, Straub and Werning (2020) demonstrate that the optimal long-term tax rate is positive and potentially large under an alternative, equally plausible assumption. This Article attempts to fill a remaining gap in the literature by providing a …

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Full Taxation: The Single Tax Emperor's New Clothes, Leopoldo Parada Oct 2023

Full Taxation: The Single Tax Emperor's New Clothes, Leopoldo Parada

Florida Tax Review

It has recently been argued in the international tax literature that the OECD Base Erosion and Profit Shifting project (BEPS) reflects and effectuates full taxation, namely an international norm that would suggest that all of a company’s income should be taxed in places where it has real business activities, representing a modern approach to the single-taxation paradigm. This Article builds upon the concept of full taxation and argues that although rhetorically attractive, the concept is still conceptually inconsistent, particularly because it is incapable of providing any hints as regards where and who should finally be taxed. Moreover, it adopts an …

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Designing Aviation Taxes Within The Eu—Chartering Ongoing Challenges And Proposing Future Solutions, Yvette Lind Oct 2023

Designing Aviation Taxes Within The Eu—Chartering Ongoing Challenges And Proposing Future Solutions, Yvette Lind

Florida Tax Review

This Article focuses on environmental taxes, specifically aviation taxes, and the challenges and limitations EU law imposes on individual EU Member States when they attempt to enforce both national and international environmental policy goals. Both the former Irish and the recently implemented Swedish aviation tax are used as comparative examples when chartering and discussing what (legal) obstacles are posed by EU law and, subsequently, the options available to individual Member States when attempting to design and implement environmental taxes. Further, common political obstacles are addressed in the Swedish and Irish case studies to further enhance the understanding of why and …

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Does Removing Quizzes Impact Student Performance In An Online Course?, John Griffith Oct 2023

Does Removing Quizzes Impact Student Performance In An Online Course?, John Griffith

Publications

Data for 295 college online introductory statistics students were examined to determine if removing four module (weekly) quizzes impacted student performance on a cumulative exam. In this research, student performance was not significantly impacted by the removal of the quizzes. The difference in the exam mean score earned by the group of students who did not take quizzes was less than 0.8 of a point lower than the exam average for students who took the quizzes prior to the exam. Withdraw rates significantly declined from 5 percent to 1 percent. Results of this study support the idea that course designers …

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Confrontare, Shivangi Rochiramani, Samrat Saha Oct 2023

Confrontare, Shivangi Rochiramani, Samrat Saha

Defensive Publications Series

This disclosure presents an innovative system and a method designed to efficiently compare vast datasets while optimizing time and cost considerations. Comprising a Learning Module and an Execution Module, the system dynamically determines optimal execution factors, ensuring resource-efficient performance. Challenges posed by extensive data and execution time are tackled by breaking tasks into stages. The system not only identifies impacted columns but also employs a proprietary Execution SQL to overcome limitations in existing techniques. A machine learning-based algorithm enhances the execution process, efficiently detecting missing and mismatched data. This integrated solution redefines data comparison, blending machine learning, advanced SQL, and …

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Smart Sounding Table Using Adaptive Neuro-Fuzzy Inference System, Osman Ünal, Nuri Akkaş Oct 2023

Smart Sounding Table Using Adaptive Neuro-Fuzzy Inference System, Osman Ünal, Nuri Akkaş

Journal of Marine Science and Technology–Taiwan

Marine engineers measure the liquid level (sounding depth) to calculate the volumetric content of a ship's tank. The sounding depth is determined using an ullage pipe located at specific points on the tanks. To estimate the accurate volume of liquid, considering the ship's trim and heel conditions, engineers use a tank table (sounding table) consisting of hundreds of pages. However, this method is time-consuming and lacks intermediate values for sounding depth, trim, and heel. Ship designers recommend to use linear interpolation for intermediate values, yet this process is also time-consuming. This paper proposes the implementation of an Adaptive Neuro-Fuzzy Inference …

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Case Study Of Coastal Erosion And Measures At Kezailiao Coast, Taiwan, Tai-Wen Hsu, Yi-Tse Tu, Jen-Yi Chang Oct 2023

Case Study Of Coastal Erosion And Measures At Kezailiao Coast, Taiwan, Tai-Wen Hsu, Yi-Tse Tu, Jen-Yi Chang

Journal of Marine Science and Technology–Taiwan

This paper examines major factors of coastal erosion and measures against beach erosion at Kezailiao Coast, Taiwan. Typical examples of coastal erosion due to natural or man-made factors are reviewed. Case studies of countermeasure for beach erosion are addressed. We further analyze and discuss historical shoreline and coastal cliff recession as a result of the attack of storm surges and waves. The coastline mainly made up of cliffs (2-3m high), made of soft, easily eroded boulder sand and clay. In total, 3km of land have been lost since 1951, including villages and farm buildings. The most important impacts of beach …

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Wearable Sensor-Based Walkability Assessment At Ferry Terminal Using Machine Learning: A Case Study Of Mokpo, Korea, Jungyeon Choi, Hwayoung Kim Oct 2023

Wearable Sensor-Based Walkability Assessment At Ferry Terminal Using Machine Learning: A Case Study Of Mokpo, Korea, Jungyeon Choi, Hwayoung Kim

Journal of Marine Science and Technology–Taiwan

Walkability assessments are becoming more popular, as walking offers numerous health, environmental, and economic benefits to communities. However, previous studies on ferry terminal walkability assessment have been inadequate. This study aimed to develop a wearable sensor system to automatically assess walkability at ferry terminals without conducting surveys. We applied seven machine learning (ML) classifiers to detect different walking environments, including flat ground (FG), downhill slope (DS), uphill slope (US), and uneven surface (UE). The ML models were evaluated across different combinations of classes: 2-class (FG vs. UE), 3-class (U) (FG vs. US vs. UE), 3-class (D) (FG vs. DS vs. …

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Application Of Blockchain Technology In Aquaculture Management, Yu-Jen Pan, Hsin-Pei Shieh Oct 2023

Application Of Blockchain Technology In Aquaculture Management, Yu-Jen Pan, Hsin-Pei Shieh

Journal of Marine Science and Technology–Taiwan

In recent years, food safety has become a growing concern in Taiwanese society. To ensure efficient management of the supply chain within the L Aquatic Products company, it is imperative to employ reliable technical support in establishing an effective traceability management system. The traceability of products can provide managers with valuable insight into the intricacies of the supply chain. By establishing a dependable food traceability system, brand trust can be strengthened, and consumers can inquire about the movement of aquatic products within the supply chain. Blockchain technology offers features such as traceability, accountability, transparency, reliability, trust, privacy, and security, making …

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Production Of Ground Granulated Blast-Furnace Slag Cement: Energy And Carbon Reduction Efficiency Of Cement-Grinding System, Kuan-Hung Lin, Chung-Chia Yang Oct 2023

Production Of Ground Granulated Blast-Furnace Slag Cement: Energy And Carbon Reduction Efficiency Of Cement-Grinding System, Kuan-Hung Lin, Chung-Chia Yang

Journal of Marine Science and Technology–Taiwan

This study used clinker, ground granulated blast-furnace slag (GGBS), and gypsum in a cement-grinding system to produce GGBS cement (GCE). Gypsum was used as the alkaline activator to modify the surface area of GCE and increase its compressive strength. The results revealed that the use of the gypsum activator and the modification of the surface area of GCE effectively increased the formerly inadequate compressive strength of GCE (GGBS > 60%) in the early stage. In addition, energy consumption data were obtained during the production of GCE and Portland cement (PCE) by the cement-grinding system. The calculations concerning the production proportions indicated …

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Automatic Side-By-Side View For Web Applications That Refer To External Content, N/A Oct 2023

Automatic Side-By-Side View For Web Applications That Refer To External Content, N/A

Defensive Publications Series

In many contexts, such as legal removal requests, price comparison, etc., users that view online content in a browser need to switch between a main tool (e.g., a legal removals tool) and other content (e.g., content for which a complaint is received). Such switching imposes a significant burden on the user and can lead to errors. This disclosure describes a browser extension/plug-in that provides an “in-context review” button that, upon selection by a user, opens the URL (e.g., content that is subject of a complaint) in a second browser window that is displayed adjacent to the main window, e.g., that …

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Time And Context Variable Topologies (Tcvt) For Sustainability-Aware Network Operational Focus Modes, Carlos M. Pignataro, Madhan Sankaranarayanan, Nagendra Kumar Nainar, Akram Sheriff, Jaganbabu Rajamanickam Oct 2023

Time And Context Variable Topologies (Tcvt) For Sustainability-Aware Network Operational Focus Modes, Carlos M. Pignataro, Madhan Sankaranarayanan, Nagendra Kumar Nainar, Akram Sheriff, Jaganbabu Rajamanickam

Defensive Publications Series

Techniques are presented herein that leverage the concept of Time-Variant Routing (TVR) to create time and context variable topologies (TCVTs) that offer a scalable and versatile solution for supporting a proportional response to changes in a network’s traffic levels, allowing a network operator to maximize sustainability gains in a network having variable, tidal, and periodic traffic. Aspects of the presented techniques encompass sub-topological planes (which can be made available to a topology as a function of time), network operational focus modes (which employ such planes to create objective-optimized topologies), and mappings between the two. The techniques allow an optimal set …

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A Method For Frictionless Signature-Based High-Risk Permissions Management On Computing Devices And System Thereof, John Markh Oct 2023

A Method For Frictionless Signature-Based High-Risk Permissions Management On Computing Devices And System Thereof, John Markh

Defensive Publications Series

The present disclosure provides a method for frictionless signature-based high-risk permissions management on computing devices. The method includes an onboarding process involving the inclusion of new software vendors by the OS or MDM vendor, a process that verifies vendor legitimacy and the necessity of their access to sensitive resources. During onboarding, the OS or MDM vendor generates an "upload key," securely provided to the software vendor, and an "app signing key," securely retained within the vendor's Key Management System (KMS). Further, the method includes releasing or publishing applications to a digital distribution service managed by the OS or MDM vendor …

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Space Vector Pwm Technique For Three- To Seven-Phase Ac-To-Ac Power Converters: Analysis And Experimental Verifications, Essa Eddin M. Rashad,, Sherif M. Dabour,, S. M. Allam Oct 2023

Space Vector Pwm Technique For Three- To Seven-Phase Ac-To-Ac Power Converters: Analysis And Experimental Verifications, Essa Eddin M. Rashad,, Sherif M. Dabour,, S. M. Allam

Journal of Engineering Research

This paper presents Pulse Width Modulation (PWM) control technique for three to seven-phase ac-to-ac power converters. These proposed PWM techniques are based on Indirect Space Vector Modulation (ISVM), which model the converter as two independent stages perform rectification and inversion stages. Two schemes of ISVM are proposed. The first scheme maximizes the voltage transfer ratio (VTR) of the converter but it produces unwanted low order harmonics. The second scheme generates sinusoidal output voltage waveforms; the cost is a reduction in the VTR of this configuration in linear mode. The viability of the proposed technique is proved using experimental results.

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Improving Power System Performance Using Demand-Side Management Within Smart Grids Environment, Ahmed Rifaat Azmy,, A. Barakatand,, A. Abaza Oct 2023

Improving Power System Performance Using Demand-Side Management Within Smart Grids Environment, Ahmed Rifaat Azmy,, A. Barakatand,, A. Abaza

Journal of Engineering Research

This paper introduces a method to improve the performance of power systems using demand side management to overcome the problems of increasing load demand. Defining suitable demand reduction levels can cause a significant enhancement for the entire network. Therefore, the sensitivity factors related to each load centre are defined to rank the load centres according to their priority. According to these factors, the best required load reduction can be obtained at each load centre. The recommended reduction level has to ensure overcoming the problems associated with the voltage profile and transmission lines overloading due to the increase in load demand. …

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Bach Array Linear Generator For Wave Energy Converters, Ahmed E. Elgebaly, , Mohamed K. El-Nemr Oct 2023

Bach Array Linear Generator For Wave Energy Converters, Ahmed E. Elgebaly, , Mohamed K. El-Nemr

Journal of Engineering Research

linear generators have been proposed as a proper power takeoff system for direct-drive wave energy conversion. Coupled directly to a reciprocating wave energy device, it was declared that linear generators could be a valuable replacement for hydraulic and pneumatic systems. In this paper, the design and performance evaluation of permanent magnet linear generator that implements Halbach array arrangement is established. The designed generator is suitable for direct energy extraction from sea waves at small wave amplitude. The electromagnetic design is performed using finite element method and space harmonic analysis. A comparative study is performed between Halbach array and conventional air-cored …

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Impact Of Large Penetration Of Wind Energy On The Performance Of Electric Power Systems, A. S. Zalhaf,, Ayman Hoballah,, Ahmed Rifaat Azmy Oct 2023

Impact Of Large Penetration Of Wind Energy On The Performance Of Electric Power Systems, A. S. Zalhaf,, Ayman Hoballah,, Ahmed Rifaat Azmy

Journal of Engineering Research

Wind energy represents one of the most important renewable energy resources that can support electrical power systems. Behaviour of wind turbines following contingencies may deteriorate system stability. This requires an extensive analysis of the possible effect of wind energy on the entire power system performance. This paper investigates the effect of wind energy on power system dynamic response. This is achieved by replacing conventional generators gradually by wind turbine (WT). Also, the optimal location of WT has been determined by checking influence on steady state operation. In addition, the effect on total fuel cost is considered to determine the optimal …

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Solar Energy For Seawater Desalination: Review Of Economics, Abd Elnaby Kabeel,, Emad M. S. El-Said, Essa Eddin M. Rashad Oct 2023

Solar Energy For Seawater Desalination: Review Of Economics, Abd Elnaby Kabeel,, Emad M. S. El-Said, Essa Eddin M. Rashad

Journal of Engineering Research

Major desalination processes consume a large amount of energy derived from oil and natural gas as heat and electricity, while emitting harmful CO2. Solar desalination has emerged as a promising solar energy-powered technology for producing fresh water. This paper will provide an overview of the economics of solar desalination with an emphasis on the Saudi fact in order to estimate the economic benefits of it in comparison with other desalination systems.

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Maximum Power Tracking Of A Grid-Connected Wind-Driven Brushless Doubly-Fed Reluctance Generator Using Scalar Control, Mohamed G. Mousa,, S. M. Allam, Oct 2023

Maximum Power Tracking Of A Grid-Connected Wind-Driven Brushless Doubly-Fed Reluctance Generator Using Scalar Control, Mohamed G. Mousa,, S. M. Allam,

Journal of Engineering Research

This paper presents a scalar volt per hertz (v/f) control technique for maximum power tracking of a grid-connected wind-driven Brushless Doubly-Fed Reluctance Generator (BDFRG). The proposed generator has two stator windings namely; power winding, directly connected to the grid, and control winding, connected to the grid through a bi-directional converter. The presented control technique is based on the abc-axis and dq-axis dynamic model of BDFRG. A detailed abc-axis and dq-axis dynamic model, by which the dynamic behaviour of the BDFRG can be successfully predicted under different operating conditions, is presented. In addition, a soft starting method is suggested to avoid …

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Web-Based Duplicate Records Detection With Arabic Language Enhancement, Azza Abd Al-Elah Higazy,, Amany M. Sarhan,, Tarek E. El-Tobely Oct 2023

Web-Based Duplicate Records Detection With Arabic Language Enhancement, Azza Abd Al-Elah Higazy,, Amany M. Sarhan,, Tarek E. El-Tobely

Journal of Engineering Research

Sharing data between organizations has growing importance in many data mining projects. Data from various heterogeneous sources often has to be linked and aggregated in order to improve data quality. The importance of data accuracy and quality has increased with the explosion of data size. The first step to ensure the data accuracy is to make sure that each real world object is represented once and only once in a certain dataset which called Duplicate Record Detection (DRD). These data inaccuracy problems exist due to due to several factors including spelling, typographical and pronunciation variation, dialects and special vowel and …

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Te Integration Of Water Hydrodynamics Modelling And Remote Sensing Data To Improve The Water Circulation Of Lake Manzala, Egypt, M. A. Bek, , Sameh B. Elkafrawy, , I. S. Lowndes,, D. M. Hargreaves Oct 2023

Te Integration Of Water Hydrodynamics Modelling And Remote Sensing Data To Improve The Water Circulation Of Lake Manzala, Egypt, M. A. Bek, , Sameh B. Elkafrawy, , I. S. Lowndes,, D. M. Hargreaves

Journal of Engineering Research

This paper presents the preliminary results of the application of the ocean model (FVCOM) to replicate the hydrodynamic flows experienced within Lake El-Manzala, Egypt. The construction of this model is used to characterize the ecosystem of this shallow brackish lake and assess a range of sustainable water management strategies. Lake El-Manzala is the largest of the Egyptian shallow coastal lakes on the fringe of the Mediterranean Sea. The lake currently supports 30% of the fresh water fish farm production of Egypt. In recent years the aquatic health of the lake has significantly deteriorated due to an increase in the contamination …

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Behaviour Of High Strength Concrete Composite Slabs With Different End Anchorages, Emad Etman, Mohamed A. Dabaon, Ahmed M. Taha Oct 2023

Behaviour Of High Strength Concrete Composite Slabs With Different End Anchorages, Emad Etman, Mohamed A. Dabaon, Ahmed M. Taha

Journal of Engineering Research

This study is performed to investigate experimentally the behaviour of steel deck composite slabs with different end anchorages. End anchorage as a type of shear connection for composite slabs plays an important role to prevent relative slip between concrete and steel deck. The presented composite slab specimens are made of high strength concrete and loaded at a specific shear span. Objectives of this study is to evaluate experimentally load carrying capacity, end slip, mode of failure, shear bond capacity, and the end anchorage contribution to the whole composite slab behaviour. Research also presents a comparison between the experimental results and …

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Experimental Shear Resistance Evaluation Of Ordinary And Perfobond Y-Shaped Shear Connectors, Mohamed A. Dabaon, , M. H. El-Boghdadi, , O. F. Kharoob, , A. H. El Gendy Oct 2023

Experimental Shear Resistance Evaluation Of Ordinary And Perfobond Y-Shaped Shear Connectors, Mohamed A. Dabaon, , M. H. El-Boghdadi, , O. F. Kharoob, , A. H. El Gendy

Journal of Engineering Research

Composite structures refer to two load carrying structural members that are integrally connected and deforming as a single unique unit using shear connectors. The use of shear connectors enhances the development of longitudinal shear forces at the steel-concrete interface. The objective of this research is to study the structural behavior of a proposed separated Y-shaped shear connector. The suggested investigated Y-shaped shear connector is intended to be an improvement to the structural response of the conventional perfobond shear connector. Accordingly, this paper carries out six push-out tests on the separated Y-shaped shear connector according to EC4. The experimental work is …

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Behavior Of Reinforced Concrete Continuous Beams Strenghened With Near Surface Mounted Reinforcement, A. Khalil, , Emad Etman,, A. H. El-Masry Oct 2023

Behavior Of Reinforced Concrete Continuous Beams Strenghened With Near Surface Mounted Reinforcement, A. Khalil, , Emad Etman,, A. H. El-Masry

Journal of Engineering Research

Using Near Surface Mounted (NSM) technique for flexural strengthening of reinforced concrete continuous beams became particularly attractive for researchers and applicators. Due to the existence of carbon fiber reinforced polymer (CFRP)laminates as external strengthening it is subjected to severe damage resulting from mechanical and environmental conditions. There is limited experimental work investigating the behavior of reinforced concrete continuous beams strengthened using NSM technique.This paper presents an experimental investigation of the behavior of reinforced concrete continuous beams strengthened with near surface mounted (NSM) technique in the hogging and sagging moment region. The main variable was changing the lengths of the NSM …

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