阅读说明：本技术 一种模拟桥梁绳索镀锌钢丝的损伤检测试验方法 (Damage detection test method for simulating galvanized steel wire of bridge rope ) 是由 孟庆领 王海良 董鹏 郭晓宇 潘鹏超 钱阳 于 2021-08-03 设计创作，主要内容包括：本发明公开一种模拟桥梁绳索镀锌钢丝的损伤检测试验方法,包括将镀锌钢丝放置在钢丝磁感应信号检测实验平台中,对其磁感应信号进行检测；将镀锌钢丝放置在试件制作平台中,制作成试件；将试件放置在钢丝磁感应信号检测实验平台中,对其磁感应信号进行检测；对采集的镀锌钢丝磁感应信号和试件磁感应信号进行分析,判定损伤程度和位置。本发明能够实现桥梁绳索镀锌钢丝损伤检测的模拟,便于对桥梁绳索镀锌钢丝进行试验研究,能够实现桥梁绳索镀锌钢丝的损伤检测研究。(The invention discloses a damage detection test method for simulating a galvanized steel wire of a bridge rope, which comprises the steps of placing the galvanized steel wire in a steel wire magnetic induction signal detection experiment platform, and detecting a magnetic induction signal of the galvanized steel wire; placing the galvanized steel wire in a test piece manufacturing platform to manufacture a test piece; placing the test piece in a steel wire magnetic induction signal detection experiment platform, and detecting the magnetic induction signal; and analyzing the collected galvanized steel wire magnetic induction signal and the test piece magnetic induction signal, and judging the damage degree and position. The invention can realize the simulation of the damage detection of the galvanized steel wire of the bridge rope, is convenient for the experimental research of the galvanized steel wire of the bridge rope and can realize the damage detection research of the galvanized steel wire of the bridge rope.)

1. A damage detection test method for simulating a galvanized steel wire of a bridge rope is characterized by comprising the following steps:

s10, placing the galvanized steel wire in a steel wire magnetic induction signal detection experiment platform, and detecting the magnetic induction signal;

s20, placing the galvanized steel wire in a test piece manufacturing platform to manufacture a test piece;

s30, placing the test piece in a steel wire magnetic induction signal detection experiment platform, and detecting the magnetic induction signal;

and S40, analyzing the collected galvanized steel wire magnetic induction signal and the test piece magnetic induction signal, and judging the damage degree and position.

2. The method for testing the damage to the galvanized steel wire of the simulation bridge rope according to claim 1, wherein in the step S20, the test piece is manufactured in the test piece manufacturing platform, and the method comprises the following steps:

firstly, weighing a galvanized steel wire by using an electronic balance;

the galvanized steel wire is connected with the positive electrode of a direct current stabilized power supply through a lead, and the negative electrode of the direct current stabilized power supply is connected with the carbon rod through a lead; the connected galvanized steel wire and the carbon rod parallelly penetrate through the two partition plates to support, the partition plates are inserted into the corrosion tank, and the carbon rod and the galvanized steel wire are immersed by using a corrosion solution; so that the direct current stabilized voltage supply, the carbon rod, the galvanized steel wire and the sodium chloride solution form a closed loop connected in series;

regulating the current of the direct current stabilized power supply to a minimum value, then regulating the voltage regulation of the direct current stabilized power supply, and setting a protection voltage; then regulating the current, wherein the direct current stabilized power supply stably outputs the set current and starts to count;

and recording the corrosion degree of the galvanized steel wire by each stage time, weighing the galvanized steel wire corroded in each stage to obtain the mass loss amount of the galvanized steel wire after corrosion, and marking the galvanized steel wires with different corrosion degrees to create the coupling damage of the corrosion fatigue of the galvanized steel wire.

3. The method for simulating the damage detection test of the galvanized steel wire of the bridge rope according to claim 2, wherein the corrosion solution is a solution with a sodium chloride concentration of 5%.

4. The method for simulating the damage detection test of the galvanized steel wire of the bridge rope according to claim 2, wherein the joint of the galvanized steel wire and the lead and the joint of the lead and the carbon rod are both bonded by waterproof tapes.

5. The method for simulating the damage detection test of the galvanized steel wire of the bridge rope according to claim 1 or 2, characterized in that the galvanized steel wire or the test piece is placed in an experimental platform for detecting magnetic induction signals of the steel wire, the magnetic induction signals are collected in a surrounding manner, the test piece is detected by moving a magnetic sensing probe, all-directional magnetic induction signal data of the test piece are collected, and the collected data are sent to a computer terminal.

6. The method as claimed in claim 5, wherein the magnetic field is excited by the magnetic sensor through the magnetic field of the galvanized steel wire and the magnetic induction signal passing through the galvanized steel wire is collected in the experimental platform for detecting the magnetic induction signal of the steel wire.

7. The method for detecting and testing the damage of the galvanized steel wire of the simulated bridge rope according to claim 6, wherein in step S10, the galvanized steel wire is placed in a steel wire magnetic induction signal detection experiment platform, and the magnetic induction signal of the galvanized steel wire is detected; establishing a corresponding data shaft according to the length of the galvanized steel wire, arranging transverse positioning coordinates of the galvanized steel wire on the data shaft, and recording magnetic induction signal data of the galvanized steel wire at a corresponding position at each positioning coordinate position;

in step S40, placing the test piece in a steel wire magnetic induction signal detection experiment platform, and detecting the magnetic induction signal; and recording the magnetic induction signal data of the test piece at the corresponding position at each positioning coordinate position according to the data shaft of the galvanized steel wire.

8. The method for detecting and testing the damage to the galvanized steel wire of the simulation bridge rope according to claim 7, wherein in the step S40, the collected magnetic induction signals are analyzed, and the method comprises the following steps:

s41, calculating the cross-sectional area of the galvanized steel wire or the test piece through magnetic induction intensity; respectively calculating a galvanized steel wire magnetic induction signal and a test piece magnetic induction signal to obtain the cross-sectional area of the galvanized steel wire or the test piece at each transverse positioning coordinate point on the data shaft;

s42, according to the cross-sectional area H of the galvanized steel wire at each transverse positioning coordinate point_{in_i}And cross-sectional area H of the test piece_{test_i}Comparing to obtain the difference value deltaH of the cross-sectional area_i＝H_{in_i}-H_{test_i}；

S43, according to the difference of the cross-sectional area Delta H_iAnd judging the damage degree, and determining the damage position according to the positioning coordinate points with the cross-sectional area difference.

9. The method for simulating the damage detection test of the galvanized steel wire of the bridge rope according to claim 8, wherein the cross-sectional area of the galvanized steel wire or the test piece is calculated as follows:

the cross-sectional area of the galvanized steel wire is H_{in_i}＝B_{in_i}Mu,/mu; wherein, B_{in_i}Positioning the magnetic induction intensity of the galvanized steel wire of the coordinate point for the ith;

the cross-sectional area of the test piece is H_{test_i}＝B_{test_i}Mu,/mu; wherein, B_{test_i}And (5) the magnetic induction intensity of the test piece of the ith positioning coordinate point, and mu is the magnetic conductivity of the galvanized steel wire.

Technical Field

The invention belongs to the technical field of bridge rope detection, and particularly relates to a damage detection test method for simulating a galvanized steel wire of a bridge rope.

Background

With the rapid development of the road traffic industry in China, a large-span cable bearing system bridge spanning wider rivers, canyons and rivers is widely constructed. The cable-stayed bridge, the suspension bridge and most of tied arch bridges are bridges taking a tensioned cable or a chain cable as a main bearing component, and the three bridge types have the advantages of large span, clear stress and beautiful line shape, and are the preferred objects for the construction of large-span bridges. Most of the bridges are cable bearing system bridges, a cable member is taken as one of key bearing members, and the durability of the bridges is greatly reduced due to damage and degradation of the cable member along with the increase of service time. When external water vapor and corrosive water enter the cable and cannot be discharged for a long time, the high-strength steel wire bundles inside the cable are corroded to different degrees, and the mechanical property of the steel wire is further reduced. Fatigue performance is reduced under the repeated action of wind and vehicle load, and when the corrosion of the internal steel wire reaches a certain degree, the cable can be subjected to brittle fracture. At present, the damage degree and the damage position of the galvanized steel wire in the cable cannot be accurately detected so as to judge the service life of the galvanized steel wire of the bridge cable.

The galvanized steel wire is an important component of the bridge rope, and the actual bridge rope is huge, so that the bridge rope can not be disassembled for experimental research, and great obstruction is brought to the research on new exploration of the galvanized steel wire. Especially, when magnetic detection is required to be applied to detection of bridge rope galvanized steel wires, detection in the field is greatly limited.

Disclosure of Invention

In order to solve the problems, the invention provides a damage detection test method for simulating a galvanized steel wire of a bridge rope, which can realize the simulation of the damage detection of the galvanized steel wire of the bridge rope, is convenient for the test research of the galvanized steel wire of the bridge rope and can realize the damage detection research of the galvanized steel wire of the bridge rope.

In order to achieve the purpose, the invention adopts the technical scheme that: a damage detection test method for simulating a galvanized steel wire of a bridge rope comprises the following steps:

s10, placing the galvanized steel wire in a steel wire magnetic induction signal detection experiment platform, and detecting the magnetic induction signal;

s20, placing the galvanized steel wire in a test piece manufacturing platform to manufacture a test piece;

s30, placing the test piece in a steel wire magnetic induction signal detection experiment platform, and detecting the magnetic induction signal;

and S40, analyzing the collected galvanized steel wire magnetic induction signal and the test piece magnetic induction signal, and judging the damage degree and position.

Further, in step S20, the method for manufacturing a test piece in the test piece manufacturing platform includes:

firstly, weighing a galvanized steel wire by using an electronic balance;

the galvanized steel wire is connected with the positive electrode of a direct current stabilized power supply through a lead, and the negative electrode of the direct current stabilized power supply is connected with the carbon rod through a lead; the connected galvanized steel wire and the carbon rod parallelly penetrate through the two partition plates to support, the partition plates are inserted into the corrosion tank, and the carbon rod and the galvanized steel wire are immersed by using a corrosion solution; so that the direct current stabilized voltage supply, the carbon rod, the galvanized steel wire and the sodium chloride solution form a closed loop connected in series;

regulating the current of the direct current stabilized power supply to a minimum value, then regulating the voltage regulation of the direct current stabilized power supply, and setting a protection voltage; then regulating the current, wherein the direct current stabilized power supply stably outputs the set current and starts to count;

and recording the corrosion degree of the galvanized steel wire by each stage time, weighing the galvanized steel wire corroded in each stage to obtain the mass loss amount of the galvanized steel wire after corrosion, and marking the galvanized steel wires with different corrosion degrees to create the coupling damage of the corrosion fatigue of the galvanized steel wire.

Further, the etching solution is a solution with a sodium chloride concentration of 5%.

Furthermore, the joint of the galvanized steel wire and the lead and the joint of the lead and the carbon rod are both bonded by waterproof adhesive tapes to prevent the galvanized steel wire and the lead from contacting with the solution.

The invention adopts an economical and reasonable mode to carry out electrochemical accelerated electrolytic corrosion on the galvanized steel wire, and compared with a salt spray corrosion test box, the invention reduces the economic cost and the time cost. Under the condition of electrifying, the galvanized steel wire can generate galvanic reaction when contacting with electrolyte solution, the galvanized coating layer firstly reacts to lose electrons and is oxidized to generate electrochemical corrosion, and steel in the galvanized coating layer completely reacts is in contact reaction with the electrolyte solution. The sodium chloride solution with the concentration of 5% is used as the electrolyte solution, so that the zinc-plated steel wire is easier to obtain, low in cost and good in conductivity, and can better contact and react with the zinc-plated steel wire. The galvanized steel wire and the carbon rod are arranged in parallel and have the same length, so that the reaction product precipitation after the reaction is reduced, and the influence of uneven contact between the galvanized steel wire and the electrolyte solution is reduced. The galvanized steel wire part needing to be protected is wrapped and covered by the waterproof adhesive tape to be protected, and is isolated from being contacted with the electrolyte solution, so that the galvanized steel wire can be subjected to ideal local corrosion. The corrosion degree of the galvanized steel wire is controlled by adjusting the current and the corrosion time of the direct current stabilized voltage power supply.

Further, place galvanized steel wire or test piece in the experiment platform that detects steel wire magnetic induction signal, encircle and gather magnetic induction signal, detect the test piece through removing the magnetic sensing probe, gather the all-round magnetic induction signal data of test piece to send data transmission to the computer end will gather.

Furthermore, in the experimental platform for detecting the steel wire magnetic induction signals, the magnetic sensor excites the magnetic field through the magnetic field of the galvanized steel wire and collects the magnetic induction intensity signals passing through the galvanized steel wire.

Further, in step S10, the galvanized steel wire is placed in a steel wire magnetic induction signal detection experiment platform, and the magnetic induction signal is detected; establishing a corresponding data shaft according to the length of the galvanized steel wire, arranging transverse positioning coordinates of the galvanized steel wire on the data shaft, and recording magnetic induction signal data of the galvanized steel wire at a corresponding position at each positioning coordinate position;

in step S40, placing the test piece in a steel wire magnetic induction signal detection experiment platform, and detecting the magnetic induction signal; and recording the magnetic induction signal data of the test piece at the corresponding position at each positioning coordinate position according to the data shaft of the galvanized steel wire.

Further, in step S40, analyzing the collected magnetic induction signal includes:

s41, calculating the cross-sectional area of the galvanized steel wire or the test piece through magnetic induction intensity; respectively calculating a galvanized steel wire magnetic induction signal and a test piece magnetic induction signal to obtain the cross-sectional area of the galvanized steel wire or the test piece at each transverse positioning coordinate point on the data shaft;

s42, according to the cross-sectional area H of the galvanized steel wire at each transverse positioning coordinate point_{int_i}And cross-sectional area H of the test piece_{test_i}Comparing to obtain the difference value deltaH of the cross-sectional area_i＝H_{int_i}-H_{test_i}；

S43, according to the difference of the cross-sectional area Delta H_iAnd judging the damage degree, and determining the damage position according to the positioning coordinate points with the cross-sectional area difference.

Further, the cross-sectional area of the galvanized steel wire or the test piece is calculated as follows:

the cross-sectional area of the galvanized steel wire is H_{int_i}＝B_{int_i}Mu,/mu; wherein, B_{int_i}Positioning the magnetic induction intensity of the galvanized steel wire of the coordinate point for the ith;

the cross-sectional area of the test piece is H_{test_i}＝B_{test_i}Mu,/mu; wherein, B_{test_i}And (5) the magnetic induction intensity of the test piece of the ith positioning coordinate point, and mu is the magnetic conductivity of the galvanized steel wire.

The beneficial effects of the technical scheme are as follows:

the method simulates the corrosion of the galvanized steel wire in the bridge cable in the using process by adopting an electrochemical principle, and judges the corrosion degree of the galvanized steel wire by controlling the current magnitude and the duration of the galvanized steel wire. The galvanized steel wire is damaged at different positions and different degrees by the above operation, the galvanized steel wire is loaded on a steel wire magnetic force platform designed by a user to detect the damage of the galvanized steel wire, and the damage degree and the damage position of the galvanized steel wire can be effectively determined by analyzing a galvanized steel wire magnetic induction signal and a test piece magnetic induction signal.

The invention realizes the simulation of the damage detection of the galvanized steel wire of the bridge rope, is convenient for the experimental research of the galvanized steel wire of the bridge rope, can realize the damage detection research of the galvanized steel wire of the bridge rope and provides important theory and experimental support for the later electromagnetic detection of the bridge rope.

Drawings

FIG. 1 is a schematic flow chart of a damage detection test method for simulating a galvanized steel wire of a bridge rope according to the invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described with reference to the accompanying drawings.

In this embodiment, referring to fig. 1, the invention provides a damage detection test method for simulating a galvanized steel wire of a bridge rope, which includes the steps of:

s10, placing the galvanized steel wire in a steel wire magnetic induction signal detection experiment platform, and detecting the magnetic induction signal;

s20, placing the galvanized steel wire in a test piece manufacturing platform to manufacture a test piece;

s30, placing the test piece in a steel wire magnetic induction signal detection experiment platform, and detecting the magnetic induction signal;

and S40, analyzing the collected galvanized steel wire magnetic induction signal and the test piece magnetic induction signal, and judging the damage degree and position.

As an optimization scheme of the above embodiment, in step S20, the method for manufacturing a test piece in the test piece manufacturing platform includes the steps of:

firstly, weighing a galvanized steel wire by using an electronic balance;

the galvanized steel wire is connected with the positive electrode of a direct current stabilized power supply through a lead, and the negative electrode of the direct current stabilized power supply is connected with the carbon rod through a lead; the connected galvanized steel wire and the carbon rod parallelly penetrate through the two partition plates to support, the partition plates are inserted into the corrosion tank, and the carbon rod and the galvanized steel wire are immersed by using a corrosion solution; so that the direct current stabilized voltage supply, the carbon rod, the galvanized steel wire and the sodium chloride solution form a closed loop connected in series;

regulating the current of the direct current stabilized power supply to a minimum value, then regulating the voltage regulation of the direct current stabilized power supply, and setting a protection voltage; regulating the current to 0.5A, wherein the direct current stabilized power supply stably outputs the current of 0.5A at the moment, and counting is started;

controlling the corrosion degree of the galvanized steel wire by using the time recorded by a timer, wherein the corrosion degree is respectively 6h, 12h, 18h and 24 h; and weighing the galvanized steel wire corroded in each stage to obtain the mass loss amount of the galvanized steel wire after corrosion, and marking the galvanized steel wires with different corrosion degrees to create the coupling damage of the corrosion fatigue of the galvanized steel wire.

Preferably, the etching solution is a solution with a sodium chloride concentration of 5%.

Preferably, the joint of the galvanized steel wire and the lead and the joint of the lead and the carbon rod are both bonded by waterproof adhesive tapes to prevent the galvanized steel wire and the lead from contacting with the solution.

The invention adopts an economical and reasonable mode to carry out electrochemical accelerated electrolytic corrosion on the galvanized steel wire, and compared with a salt spray corrosion test box, the invention reduces the economic cost and the time cost. Under the condition of electrifying, the galvanized steel wire can generate galvanic reaction when contacting with electrolyte solution, the galvanized coating layer firstly reacts to lose electrons and is oxidized to generate electrochemical corrosion, and steel in the galvanized coating layer completely reacts is in contact reaction with the electrolyte solution. The sodium chloride solution with the concentration of 5% is used as the electrolyte solution, so that the zinc-plated steel wire is easier to obtain, low in cost and good in conductivity, and can better contact and react with the zinc-plated steel wire. The galvanized steel wire and the carbon rod are arranged in parallel and have the same length, so that the reaction product precipitation after the reaction is reduced, and the influence of uneven contact between the galvanized steel wire and the electrolyte solution is reduced. The galvanized steel wire part needing to be protected is wrapped and covered by the waterproof adhesive tape to be protected, and is isolated from being contacted with the electrolyte solution, so that the galvanized steel wire can be subjected to ideal local corrosion. The corrosion degree of the galvanized steel wire is controlled by adjusting the current and the corrosion time of the direct current stabilized voltage power supply.

As the optimization scheme of the embodiment, the galvanized steel wire or the test piece is placed in an experiment platform for detecting steel wire magnetic induction signals, the magnetic induction signals are collected in a surrounding mode, the test piece is detected by moving the magnetic induction probe, all-dimensional magnetic induction signal data of the test piece are collected, and the collected data are sent to the computer.

In the experimental platform for detecting the steel wire magnetic induction signals, the magnetic field is excited by the magnetic sensor through the magnetic field of the galvanized steel wire, and the magnetic induction intensity signals passing through the galvanized steel wire are collected.

In step S10, the galvanized steel wire is placed in a steel wire magnetic induction signal detection experiment platform, and the magnetic induction signal is detected; establishing a corresponding data shaft according to the length of the galvanized steel wire, arranging transverse positioning coordinates of the galvanized steel wire on the data shaft, and recording magnetic induction signal data of the galvanized steel wire at a corresponding position at each positioning coordinate position;

in step S40, placing the test piece in a steel wire magnetic induction signal detection experiment platform, and detecting the magnetic induction signal; and recording the magnetic induction signal data of the test piece at the corresponding position at each positioning coordinate position according to the data shaft of the galvanized steel wire.

Wherein, carry out the analysis to the magnetic induction signal of gathering, include the step:

s41, calculating the cross-sectional area of the galvanized steel wire or the test piece through magnetic induction intensity; respectively calculating a galvanized steel wire magnetic induction signal and a test piece magnetic induction signal to obtain the cross-sectional area of the galvanized steel wire or the test piece at each transverse positioning coordinate point on the data shaft;

calculating the cross-sectional area of the galvanized steel wire or the test piece:

the cross-sectional area of the galvanized steel wire is H_{int_i}＝B_{int_i}Mu,/mu; wherein, B_{int_i}Positioning the magnetic induction intensity of the galvanized steel wire of the coordinate point for the ith;

the cross-sectional area of the test piece is H_{test_i}＝B_{test_i}Mu,/mu; wherein, B_{test_i}And (5) the magnetic induction intensity of the test piece of the ith positioning coordinate point, and mu is the magnetic conductivity of the galvanized steel wire.

S42, according to the cross-sectional area H of the galvanized steel wire at each transverse positioning coordinate point_{int_i}And cross-sectional area H of the test piece_{test_i}Comparing to obtain the difference value deltaH of the cross-sectional area_i＝H_{int_i}-H_{test_i}；

S43, according to the difference of the cross-sectional area Delta H_iAnd judging the damage degree, and determining the damage position according to the positioning coordinate points with the cross-sectional area difference.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.