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  3. Buckling analysis of composite columns reinforced with various fibers based on mechanical properties obtained from laboratory samples

Buckling analysis of composite columns reinforced with various fibers based on mechanical properties obtained from laboratory samples

Number of pages: 19 File Format: word File Code: 32287
Year: 2011 University Degree: Master's degree Category: Research Methodology
Tags/Keywords: Buckling analysis - Composite columns - Fiber concrete - Fibers - Hydraulic structures - Unreinforced concrete - wear
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  • Summary of Buckling analysis of composite columns reinforced with various fibers based on mechanical properties obtained from laboratory samples

    Mechanical Engineering

    Master thesis proposal

    -Introduction

    The use of fibers in concrete started about 50 years ago and their use in various fields has increased day by day. Adding fibers to the mixing design improves the mechanical properties of concrete and the behavior of the structure after cracking. It also increases the softness and malleability of the section. In general, fiber-reinforced concrete can be expected to improve parameters related to compressive, tensile, bending, shear, dynamic, impact, waterlogging and creep, resistance to freezing and thawing, wear, cavitation, and erosion.

    Today, fiber concrete is used for many applications such as road paving, bridge walkways, industrial floors, vibration machine foundations, Dam overflows, relaxation ponds, concrete sewer pipes, tunnel linings, etc. It is used [1].

    1-1 Fiber concrete and hydraulic structures

    Fiber concrete has been used in many cases in the series of dams and relaxation ponds. Compared to those made with plain concrete, such structures show significant resistance to cavitation, wear and erosion. The results of tests and field applications show that concrete reinforced with steel fibers has 3 times the life of plain concrete under high-speed water flow [1]. This basic weakness of concrete can be overcome by installing steel reinforcement and forming reinforced concrete and providing the required tensile force. It should be noted that in many cases, the direction of the tensile force is not precisely known, and due to the small cross-sectional area of ??the reinforcement compared to concrete, the idea of ??creating a homogeneous and isotropic cross-section is not correct [2]. In order to create homogeneous conditions and reduce the weakness of concrete against its elasticity and fragility as much as possible, the use of thin and relatively long fibers that are randomly distributed in the concrete mixing plan (SFRC) [1], has become common in the past few decades [3]. The presence of fibers in concrete can solve the weakness of concrete in tension to some extent and prevent the spread of cracks by integrating concrete and creating tensile properties.

    (Images and diagrams are available in the main file)

    -Introduction

    The use of fibers in concrete started about 50 years ago and their use in various fields is increasing day by day. is Adding fibers to the mixing design improves the mechanical properties of concrete and the behavior of the structure after cracking. It also increases the softness and malleability of the section. In general, fiber-reinforced concrete can be expected to improve parameters related to compressive, tensile, bending, shear, dynamic, impact, waterlogging and creep, resistance to freezing and thawing, wear, cavitation, and erosion.

    Today, fiber concrete is used for many applications such as road paving, bridge walkways, industrial floors, vibration machine foundations, Dam overflows, relaxation ponds, concrete sewer pipes, tunnel linings, etc. It is used [1].

    1-1 Fiber concrete and hydraulic structures

    Fiber concrete has been used in many cases in the series of dams and relaxation ponds. Compared to those made with plain concrete, such structures show significant resistance to cavitation, wear and erosion. The results of tests and field applications show that concrete reinforced with steel fibers has 3 times the life of plain concrete under high-speed water flow [1]. This basic weakness of concrete can be overcome by installing steel reinforcement and forming reinforced concrete and providing the required tensile force.It should be noted that in many cases, the direction of the tensile force is not precisely known, and due to the small cross-sectional area of ??the reinforcement compared to concrete, the idea of ??creating a homogeneous and isotropic cross-section is not correct [2]. In order to create homogenous conditions and reduce the weakness of concrete against its elasticity and brittleness as much as possible, the use of thin and relatively long fibers that are randomly distributed in the concrete mixing plan (SFRC) [1], has become common in the past few decades [3].

  • Contents & References of Buckling analysis of composite columns reinforced with various fibers based on mechanical properties obtained from laboratory samples

    List:

    - Introduction

    1-1 History of refrigeration and air conditioning system. 2

    1-1-1 Artificial refrigeration. 3

    1-1-2 Thermal refrigeration systems. 15

    1-1-3 Vortex tube systems. 16

    1-1-4 Working principles of compression systems. 17

    1-1-5 Techniques used in refrigeration systems to reduce energy consumption. 19

    1-1-5-1 Inverter for air conditioning systems. 19

    1-1-5-2 Solar Split. 21

    1-1-5-3 Use of sensors. 23

    1-1-5-3-1 Temperature sensitive resistance or RTD 23

    1-1-5-3-2 thermistor. 24

    1-1-5-3-3 laser photocell sensor. 25

    1-2 objectives and necessity of doing the thesis. 25

    1-3 outline of the thesis. 26

    2- Principles of intelligent refrigeration system design and sensor selection

    2-1 Objectives and necessity of intelligent refrigeration system design. 29

    2-2 Checking the types of human detection sensors. 30

    2-2-1 Ultrasonic sensors. 30

    2-2-2 Use of webcam (Webcam) and Open CV (Open Source Computer Vision). 32

    2-2-3 Passive infrared sensors PIR (Passive infrared sensor). 35

    2-2-4 Use of IR (Infra Red) thermometer sensor. 40

    2-3 review and selection of suitable infrared sensor. 45

    2-4 requirements for intelligent system design and sensor placement. 48

    3- Design and construction of intelligent refrigeration system

    3-1 design and algorithm of operation of intelligent system. 53

    3-2 components of intelligent built human recognition system. 55 3-2-1 Microcontroller 55 3-2-2 Infrared thermometer sensor Mlx90614bci 57 3-2-3 LCD display 57 3-2-4 Servo motor 58 3-2-5 Power unit 61 3-2-6 Alarms 62

    3-2-7 Base system. 63

    3-3 functional program of the device. 63

    4- Tests and results obtained in the intelligent refrigeration system

    4-1 results of the tests of the intelligent refrigeration system. 67

    4-2 Comparison of mercury thermometer with infrared thermometer sensor. 74

    4-3 Reproducibility test. 76

    4-4 Comparison of the performance of a refrigeration system using From the intelligent system and without using the intelligent system. 77

    5- Discussion and conclusion

    1-5 Discussion and conclusion. 81

    List of references. By carrier software.96

     

     

     

     

    Source:

     

     

    [1] Nahste.ac.uk "Cullen William (1710-1790) physician, chemist and metallurgist". Retrieved 20 January 2012.

     

    [2] Burstall, Aubrey ."A History of Mechanical Engineering. The MIT Press". ISBN 0-262-5. 2001

     

    [3] Grant. "Boyle, David". In Stephen, Leslie. Dictionary of National Biography 6. London: Smith, Elder & Co. pp. 109–110. [4] Margaret Ingels, "Willis Haviland Carrier: father of air conditioning, Country Life" Press, 1952, [5] Arora, Ramesh Chandra. "Mechanical vapor compression refrigeration". Refrigeration and Air Conditioning. New Delhi, India: PHI Learning [6 by J. M. Bumsted. "Dictionary of Manitoba Biography". Winnipeg: University of Manitoba Press, 1999. Page revised: 6 May 2009

    [7] Walker, Jearl. "The madness of stirring tea". The Flying Circus of Physics. John Wiley & Sons, Inc. p. 97

    [8] Ross Montgomery. "Fundamentals of HVAC Control Systems" ashrae. 2010

    [9] Richard E. Sonntag, Claus Borgnakke, and Gordon J. Van Wylen. "Fundamentals of thermodynamics". UG/GGS Information service, Inc. sixth edition. P 436. 2003

    [10] Victor Streeter "Fluid Mechanics". Publisher: McGraw-Hill. 3rd Edition. (1962)

    [11] Yunus A. Cengel & John M. Cimbala "Fluid Mechanics: Fundamentals and Applications" Publisher: McGraw-Hill.  Edition: 3rd. 2013

    [12] Martin A. Green and Anita Ho-Baillie, "Forty three percent composite split-spectrum concentrator solar cell efficiency", ARC Photovoltaics Center ofGreen and Anita Ho-Baillie, "Forty three percent composite split-spectrum concentrator solar cell efficiency", ARC Photovoltaics Center of Excellence, University of New South Wales, Australia, 2010

                      

    [13] Jack Holman. "Heat Transfer" McGraw-Hill. tenth edition. Jan 13, 2009

    [14] William J. Coad & Roland H. Howell "Principles of Heating, Ventilating, and Air Conditioning" 7th edition. Ashrae. 2013

    ]15 [Dr. Seyed Ebrahim Hosseini, "Industrial Control 1383", Dibagaran Publications, Tehran, page 179 to 188.

Buckling analysis of composite columns reinforced with various fibers based on mechanical properties obtained from laboratory samples
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