Effect of casting method and shear span-to-depth ratio on the behaviour of Ultra-High Performance Concrete cross arms for high voltage transmission lines

2010 ◽  
Vol 32 (8) ◽  
pp. 2210-2220 ◽  
Author(s):  
Raafat El-Hacha ◽  
Hani Abdelazeem ◽  
Ignacio Cariaga
Keyword(s):  
High Voltage ◽  
Transmission Lines ◽  
High Performance ◽  
High Performance Concrete ◽  
Ultra High Performance Concrete ◽  
Casting Method ◽  
Shear Span ◽  
Depth Ratio ◽  
High Voltage Transmission

scholarly journals High-strength concrete with new organic mineral complex admixture

2019 ◽  
Vol 265 ◽  
pp. 01003
Author(s):  
Makhmud Abu-Khasan ◽  
Valentina Soloviova ◽  
Dmitry Soloviov
Keyword(s):  
Reinforced Concrete ◽  
High Voltage ◽  
Transmission Lines ◽  
High Performance ◽  
Mineral Admixture ◽  
Line Lattice ◽  
Organic Mineral ◽  
The Creation ◽  
High Voltage Transmission ◽  
Lattice Towers

There are the great problems of the concrete for high voltage the transmission lines obtaining. One of them is the creation of reinforced concrete centrifugally spun transmission towers with enhanced reliability and durability for high-voltage transmission lines having voltage of 110-750 kV. The second problem is the creation of high-quality reinforced concrete foundations to fix overhead electric line lattice towers in the ground because more than 50% of operated reinforced concrete towers and foundations are in need of repair or were put into repair. A complex high-performance organic mineral admixture for tower bodies of high-voltage transmission lines is developed. The main components of the admixture are polycarboxylate polymere and silica sol. It insures increased compressive strength and tensile strength in bending, freeze resistance, waterproofing and corrosive resistance. The obtained positive results allow to reduce a compression zone width and a crack growth width. The paper can be useful for not only the transport construction but and for concrete obtaining with special properties at any fields.

An Artificial Intelligence Based Current Measurement Technique in High Voltage Power Transmission and Distribution Lines using Pyro-Sensors

2021 ◽  
Vol 4 (2) ◽  
pp. 94-99
Author(s):  
Ali Rehman ◽  
Zeeshan Najam Khan ◽  
Muhammad Siddique ◽  
Muhammad Shahzad ◽  
Makhdoom Muhammad Naeem ◽  
...  
Keyword(s):  
Neural Network ◽  
Artificial Intelligence ◽  
High Voltage ◽  
Transmission Lines ◽  
High Performance ◽  
Power Transmission ◽  
Heat Waves ◽  
Current Transformer ◽  
Distribution Lines ◽  
High Voltage Transmission

High voltage transmission lines are the fundamental element in order to transfer electricity from the power plant/grid to consumers. The frequency, current and voltage are the key figures to sustain the absolute quality of the power transmission, and maintaining such high performance requires smart solutions and equipment like Current Transformer (CT) & Potential Transformer (PT). This proposed work enlightens an inception to monitor current in the high voltage transmission lines by using pyro-sensors, machine learning (ML) techniques and artificial intelligence (AI). Using pyro-sensors around the transmission/distribution lines, data will be gathered about the heat waves (infrared waves) generated by the electric current in the transmission/distribution line. The proposed methodology uses this data to be processed by neural network based artificial intelligent algorithm to evaluate the amount of current in the transmission line. The claim about the authenticity of the proposed technique is tested and verified by MATLAB simulation neural network toolbox.

scholarly journals High-strength Concrete with new organic mineral complex admixture

2018 ◽  
Vol 193 ◽  
pp. 03019 ◽  
Author(s):  
Mahmud Abu-Khasan ◽  
Valentina Solovyova ◽  
Dmitry Solovyov
Keyword(s):  
Reinforced Concrete ◽  
High Voltage ◽  
Transmission Lines ◽  
High Performance ◽  
Mineral Admixture ◽  
Line Lattice ◽  
Organic Mineral ◽  
The Creation ◽  
High Voltage Transmission ◽  
Lattice Towers

There are the great problems of the concrete for high voltage the transmission lines obtaining. One of them is the creation of reinforced concrete centrifugally spun transmission towers with enhanced reliability and durability for high-voltage transmission lines having voltage of 110-750 kV. The second problem is the creation of high-quality reinforced concrete foundations to fix overhead electric line lattice towers in the ground because more than 50% of operated reinforced concrete towers and foundations are in need of repair or were put into repair. A complex high-performance organic mineral admixture for tower bodies of high-voltage transmission lines is developed. The main components of the admixture are polycarboxylate polymere and silica sol. It insures increased compressive strength and tensile strength in bending, freeze resistance, waterproofing and corrosive resistance. The obtained positive results allow to reduce a compression zone width and a crack growth width. The paper can be useful for not only the transport construction but and for concrete obtaining with special properties at any fields.

Flexural design of precast, prestressed ultra-high-performance concrete members

PCI Journal ◽  
2020 ◽  
Vol 65 (6) ◽  
pp. 35-61
Author(s):  
Chungwook Sim ◽  
Maher Tadros ◽  
David Gee ◽  
Micheal Asaad
Keyword(s):  
Prestressed Concrete ◽  
High Performance ◽  
High Performance Concrete ◽  
Limit State ◽  
Design Guidelines ◽  
Design Tool ◽  
Supplementary Cementitious Materials ◽  
Ultra High Performance Concrete ◽  
Concrete Members ◽  
Cylinder Strength

Ultra-high-performance concrete (UHPC) is a special concrete mixture with outstanding mechanical and durability characteristics. It is a mixture of portland cement, supplementary cementitious materials, sand, and high-strength, high-aspect-ratio microfibers. In this paper, the authors propose flexural design guidelines for precast, prestressed concrete members made with concrete mixtures developed by precasters to meet minimum specific characteristics qualifying it to be called PCI-UHPC. Minimum specified cylinder strength is 10 ksi (69 MPa) at prestress release and 18 ksi (124 MPa) at the time the member is placed in service, typically 28 days. Minimum flexural cracking and tensile strengths of 1.5 and 2 ksi (10 and 14 MPa), respectively, according to ASTM C1609 testing specifications are required. In addition, strain-hardening and ductility requirements are specified. Tensile properties are shown to be more important for structural optimization than cylinder strength. Both building and bridge products are considered because the paper is focused on capacity rather than demand. Both service limit state and strength limit state are covered. When the contribution of fibers to capacity should be included and when they may be ignored is shown. It is further shown that the traditional equivalent rectangular stress block in compression can still be used to produce satisfactory results in prestressed concrete members. A spreadsheet workbook is offered online as a design tool. It is valid for multilayers of concrete of different strengths, rows of reinforcing bars of different grades, and prestressing strands. It produces moment-curvature diagrams and flexural capacity at ultimate strain. A fully worked-out example of a 250 ft (76.2 m) span decked I-beam of optimized shape is given.

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