scholarly journals A Corrosion Detection Method for Steel Strands Based on LC Electromagnetic Resonance

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Yong Huang ◽  
Hang Zhang ◽  
Benniu Zhang ◽  
Xingxing Li ◽  
Xiaoyu Sang ◽  
...  
Keyword(s):  
Corrosion Rate ◽  
Resonance Frequency ◽  
Steel Wire ◽  
Resonance Method ◽  
Resonance Circuit ◽  
Corrosion Detection ◽  
Prestressing Force ◽  
Electromagnetic Resonance ◽  
Healthy State ◽  
Practical Engineering

At present, prestress detection is a worldwide problem. Corrosion has an important impact on the accuracy of the stress detection results of prestressed tendons. Once the steel strands in service is corroded, stress corrosion will occur, which seriously affects the safe operation of the prestressed structure. Based on the LC electromagnetic resonance circuit to detect the prestressing force of steel strands, this research has been successfully applied to the detection of the corrosion rate of steel strands, which lays the foundation for the nondestructive detection of the healthy state of steel strands in the existing structure. In this study, the steel strands were regarded as an external inductor embedded in the LC resonance circuit. After the steel strands was corroded, its electromagnetic characteristics would change, and this change was manifested by the resonance frequency. In this paper, the regular change of the resonance frequency caused by the change of the inductance of the steel wire after corrosion was explained theoretically, and a theoretical model of the relationship between the electromagnetic resonance frequency and the corrosion rate was established. In this study, it was proved through experiments that the LC electromagnetic resonance method can accurately detect the overall corrosion degree of bare steel stranded wires, and a fitting formula for corrosion detection of steel stranded wires was established. Through the analysis and exploration of the test data and test phenomena, it has been found that the action mechanism of the stranded wire decreases with the increase of the corrosion rate and the inductance thereof, which leads to the increase of the resonance frequency. The discovery of these laws will provide an improved basis for the prestress detection of in-service steel strands by LC resonant circuits and make the method to be further applied to practical engineering.

scholarly journals Smart Sensing of PSC Girders Using a PC Strand with a Built-in Optical Fiber Sensor

2021 ◽  
Vol 11 (1) ◽  
pp. 359
Author(s):  
Sung Tae Kim ◽  
Hyejin Yoon ◽  
Young-Hwan Park ◽  
Seung-Seop Jin ◽  
Soobong Shin ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Prestressed Concrete ◽  
Steel Wire ◽  
Optical Fiber Sensor ◽  
Fiber Reinforced Polymer ◽  
Bridge Structure ◽  
Fbg Sensor ◽  
Prestressing Force ◽  
Reinforced Polymer ◽  
Loading Tests

This paper presents a multi-functional strand capable of introducing prestressing force in prestressed concrete (PSC) girders and sensing their static and dynamic behavior as well. This innovative strand is developed by replacing the core steel wire of the strand used in PSC structures with a carbon fiber-reinforced polymer (CFRP) wire with a built-in optical Fiber Bragg Grating (FBG) sensor. A full-scale girder specimen was fabricated by applying this multi-function strand to check the possibility of tracking the change of prestressing force at each construction stage. Moreover, dynamic data could be secured during dynamic loading tests without installing accelerometers and made it possible to obtain the natural frequencies of the structure. The results verified the capability to effectively manage the prestressing force in the PSC bridge structure by applying the PC strand with a built-in optical sensor known for its outstanding practicability and durability.

Analysis the Flexural Properties of RC Beams Strengthened by High Strength Steel Wire Mesh and Polymer Mortar Using the Finite Element

2013 ◽  
Vol 444-445 ◽  
pp. 1067-1071
Author(s):  
Li Ping Sun ◽  
Zheng Liu ◽  
Yan Zi Liu
Keyword(s):  
High Strength Steel ◽  
Steel Wire ◽  
High Strength ◽  
Wire Mesh ◽  
Flexural Properties ◽  
Rc Beams ◽  
Reinforced Beams ◽  
Practical Engineering ◽  
Polymer Mortar ◽  
Steel Wire Mesh

The high strength steel wire mesh and polymer mortar reinforcement technology has the advantages of high strength, high temperature resistance,corrosion,resistant, etc. In this paper,we analysis the flexural properties of RC beams strengthened by it using ANSYS.To bear the same moment in the same area of the reinforcement steel strand, and then get effect of different span and different reinforcement methods (comparative beam, direct reinforced beams,and secondary load of reinforced beams) on flexural load-carrying capacity and deflection, then compare and analysis,and draws the conclusion which can provide reference for practical engineering.

scholarly journals Dipole moments and molecular structure. Part I.— A simple resonance method for the measurement of dielectric constants

1932 ◽  
Vol 136 (829) ◽  
pp. 251-255 ◽  
Keyword(s):  
Molecular Structure ◽  
Dipole Moment ◽  
Dipole Moments ◽  
Resonance Method ◽  
Dielectric Constants ◽  
Present Communication ◽  
Dilute Solutions ◽  
Resonance Circuit ◽  
Low Resistance ◽  
Voltage Resonance

Numerous types of resonance methods for the measurement of dielectric constants have been described by different investigators. That detailed in the present communication has no claim to originality, but it is a simple, whilst at the same time reliable, form, which has proved to be very useful for the measurement of the dielectric constants of dilute solutions for the purpose of dipole moment determination. A fairly powerful oscillator is used, enabling the valveless resonance circuit to be some distance removed from it, whilst still receiving ample “pick-up” for the measurements. Resonance in the pick-up circuit is detected by means of a low-resistance thermo-junction, introduced directly into the circuit. The resistance thus introduced does not damp the oscillation unduly. The very small conductivity of the solvent liquids employed does not produce any appreciable error owing to the current resonance not occurring at the same tuning capacity as the voltage resonance.

Experiment on the Deformation of the Reinforced Concrete Beam NSM Prestressed Steel Spiral Ribs

2011 ◽  
Vol 94-96 ◽  
pp. 1278-1285
Author(s):  
Chun Sheng Zhang ◽  
Mei Xiang Zhang ◽  
Ya Hong Ding
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Concrete Beams ◽  
Steel Wire ◽  
Reinforced Concrete Beam ◽  
Concrete Cover ◽  
Reinforced Concrete Beams ◽  
Practical Engineering ◽  
General Deformation ◽  
Good Agreement

A new reinforcement technology with prestressed helical rib steel wire bonded in sawed grooves in the concrete cover is presented, based on the deficiency of the presented reinforcement methods. Four test beams NSM prestressed steel spiral ribs are tested in this paper. The stiffness expression of the reinforced concrete beams in different stages is derived and the stiffness formulas of the reinforced concrete beams are gained, based on the general deformation principles of reinforced concrete beams and the characteristics of the reinforced concrete beam NSM prestressed steel spiral ribs. The results of the calculation and the experimental results show good agreement. It shows that the reinforced concrete beam NSM prestressed steel spiral ribs can effectively delay the development of cracks, reduce the component deformation and increase its stiffness. The results provide an experimental basis for the reinforcement method in practical engineering applications.

Experimental Research on Mechanical Properties of ALC Wallboard

2011 ◽  
Vol 368-373 ◽  
pp. 423-427
Author(s):  
Yan Min Yang ◽  
Yi Ran Zhang
Keyword(s):  
Mechanical Properties ◽  
Experimental Research ◽  
Lightweight Concrete ◽  
Steel Wire ◽  
Impact Resistance ◽  
Wall Material ◽  
Composite Sandwich ◽  
Practical Engineering ◽  
Bending Capacity ◽  
Building Wall

The new building wall material solid composite sandwich panel consists of panel and inserted layer material-steel wire nets of composite light bar, and it is called ALC ( Autoclaved Lightweight Concrete) wallboard. The transportation, installation of ALC wallboard is required to meet certain strength requirement, and the wallboard can carry the aseismatic behavior and the bending capacity when it is laid into the wall. Therefore, in order to ensure the ALC wallboard can be better applied in practical engineering, the experimental research need to be done on the wallboard mechanical properties, such as impact resistance, hanging force, bending resistance, etc.

Optimization of Capacitor Copper Plate for Dielectric Heating to Eliminate Insect

2013 ◽  
Vol 343 ◽  
pp. 101-105
Author(s):  
Kongsak Ratniyomchai ◽  
Samran Santalunai ◽  
Thanaset Thosdeekoraphat ◽  
Chanchai Thongsopa
Keyword(s):  
Resonance Frequency ◽  
Copper Plate ◽  
Fast Time ◽  
Power Transfer ◽  
Dielectric Heating ◽  
Plate Material ◽  
Resonance Circuit

This paper presents the optimization of dielectric heating by using capacitor copper plate material. It has dimension of 50x50 mm. and the distance between plates is 3 mm. This work is used for preheating of insect and pests. Considering the RLC resonance circuit and the power per heating area, the rice weevils are used for sample dielectric. While the power transfer is varied from 10 - 80 watt and resonance frequency at 65 MHz for analysis, the rice weevils are died when the power transfer are more than 70 watt in 1 second. Moreover, It the power transfer is decrease, the period of time is increase. Approximate 10 watt of power transfer, the plate copper has less power so the rice weevils are breaking. Therefore, the power transfer has an effect on the heating area, which is the relation of the fast time.

scholarly journals Fractal, Scale Free Electromagnetic Resonance of a Single Brain Extracted Microtubule Nanowire, a Single Tubulin Protein and a Single Neuron

2020 ◽  
Vol 4 (2) ◽  
pp. 11 ◽  
Author(s):  
Komal Saxena ◽  
Pushpendra Singh ◽  
Pathik Sahoo ◽  
Satyajit Sahu ◽  
Subrata Ghosh ◽  
...  
Keyword(s):  
Resonance Frequency ◽  
Information Integration ◽  
Self Similarity ◽  
Frequency Pattern ◽  
Scale Free ◽  
Electromagnetic Resonance ◽  
Time Domains ◽  
Tubulin Protein ◽  
Work Supports ◽  
The Brain

Biomaterials are primarily insulators. For nearly a century, electromagnetic resonance and antenna–receiver properties have been measured and extensively theoretically modeled. The dielectric constituents of biomaterials—if arranged in distinct symmetries, then each vibrational symmetry—would lead to a distinct resonance frequency. While the literature is rich with data on the dielectric resonance of proteins, scale-free relationships of vibrational modes are scarce. Here, we report a self-similar triplet of triplet resonance frequency pattern for the four-4 nm-wide tubulin protein, for the 25-nm-wide microtubule nanowire and 1-μm-wide axon initial segment of a neuron. Thus, preserving the symmetry of vibrations was a fundamental integration feature of the three materials. There was no self-similarity in the physical appearance: the size varied by 106 orders, yet, when they vibrated, the ratios of the frequencies changed in such a way that each of the three resonance frequency bands held three more bands inside (triplet of triplet). This suggests that instead of symmetry, self-similarity lies in the principles of symmetry-breaking. This is why three elements, a protein, it’s complex and neuron resonated in 106 orders of different time domains, yet their vibrational frequencies grouped similarly. Our work supports already-existing hypotheses for the scale-free information integration in the brain from molecular scale to the cognition.

Effects of Structural Behavior on Electromagnetic Resonance Frequency of a Superconducting Radio Frequency Cavity

2007 ◽  
Vol 23 (3) ◽  
pp. 187-196 ◽  
Author(s):  
M.-C. Lin ◽  
Ch. Wang ◽  
L.-H. Chang ◽  
M.-K. Yeh ◽  
F.-S. Kao
Keyword(s):  
Radio Frequency ◽  
Resonance Frequency ◽  
Frequency Shift ◽  
Liquid Helium ◽  
Coefficient Of Thermal Expansion ◽  
External Pressure ◽  
Load Variations ◽  
Electromagnetic Resonance ◽  
Superconducting Radio Frequency ◽  
External Loads

AbstractDuring operation, a superconducting radio frequency cavity is cooled down to below critical superconducting temperature by liquid helium. Thus it is under external pressure by liquid helium while an ultrahigh vacuum inside. Being a niobium-made shell structure, the SRF cavity's shape and consequently the electromagnetic resonance frequency are sensitive to external load variations. A CESR-III 500MHz superconducting radio frequency cavity is illustrated to investigate this relationship. A simulation that links the calculations on mechanical structure and radio frequency electromagnetic field with the finite element code ANSYS® is demonstrated herein. The changes of electromagnetic resonance frequency associated with external loads and mechanical properties of niobium are studied systematically. A complete understanding on the mechanism is thus achieved. The computed results also indicate that the electromagnetic resonance frequency increases as the cavity is either cooled to cryogenic temperature or stretched longitudinally, while the reduction of the helium vessel pressure also raises the resonance frequency. Besides, the electromagnetic resonance frequency shift is ruled by the coefficient of thermal expansion when the cavity is cooled from room temperature to liquid helium temperature. Young's modulus and thickness of the cavity wall dominate the structure stiffness and thus also affect the frequency shift.

Temperature Effect on Pseudomonas Aeruginosa Growth and Its Presence on Corrosion of Steel Wire Rope

2020 ◽  
Vol 1010 ◽  
pp. 92-97
Author(s):  
Nurhaziqah Hasim ◽  
Nur Syuhada Azmi ◽  
Wan Fahmin Faiz Wan Ali ◽  
Esah Hamzah ◽  
Adibah Yahya ◽  
...  
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Corrosion Rate ◽  
Ph Value ◽  
Steel Wire ◽  
Wire Rope ◽  
Bacterial Activity ◽  
Effect Of Temperature ◽  
Solution Interface ◽  
Corrosion Pitting ◽  
Corrosion Of Steel

Bacterial can initiate, accelerate, and/or inhibit corrosion processes through a number of different ways, including modification of the localized environment at the metal/solution interface by causing pitting attack. In this work, the effect of temperature on bacteria (P.Aeruginosa sp) growth will be investigated the nature of bacteria before further investigated its corrosion effect on steel wire rope. It is found that the bacteria grew actively at 30°C. The pH value was also changed from 7 to 8. The corrosion rate with the presence of bacteria has been found increased from 9.95 x 10-7 mdy to 4.884 x 10-5 mdy. While corrosion pitting is found directly proportional to the bacterial activity.

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