CN116362616A - Evaluation index and evaluation method for detecting collision protection grade of waveform beam guardrail - Google Patents
Evaluation index and evaluation method for detecting collision protection grade of waveform beam guardrail Download PDFInfo
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- CN116362616A CN116362616A CN202310346227.0A CN202310346227A CN116362616A CN 116362616 A CN116362616 A CN 116362616A CN 202310346227 A CN202310346227 A CN 202310346227A CN 116362616 A CN116362616 A CN 116362616A
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- 238000011156 evaluation Methods 0.000 title claims abstract description 40
- 238000012360 testing method Methods 0.000 claims abstract description 47
- 238000000034 method Methods 0.000 claims abstract description 28
- 230000004044 response Effects 0.000 claims abstract description 20
- 238000011065 in-situ storage Methods 0.000 claims abstract description 16
- 230000003993 interaction Effects 0.000 claims abstract description 14
- 239000002689 soil Substances 0.000 claims abstract description 14
- 238000001514 detection method Methods 0.000 claims abstract description 12
- 238000009659 non-destructive testing Methods 0.000 claims abstract description 12
- 238000009933 burial Methods 0.000 claims abstract description 9
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 8
- 230000005284 excitation Effects 0.000 claims abstract description 8
- 239000010959 steel Substances 0.000 claims abstract description 8
- 238000011158 quantitative evaluation Methods 0.000 claims abstract description 6
- 238000010998 test method Methods 0.000 claims abstract description 4
- 230000001066 destructive effect Effects 0.000 claims description 5
- 238000005259 measurement Methods 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 4
- 238000012423 maintenance Methods 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 3
- 238000013461 design Methods 0.000 claims description 3
- 238000010835 comparative analysis Methods 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 2
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
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- G06Q10/0639—Performance analysis of employees; Performance analysis of enterprise or organisation operations
- G06Q10/06393—Score-carding, benchmarking or key performance indicator [KPI] analysis
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
Abstract
The invention provides an evaluation index and an evaluation method for detecting the collision protection level of a waveform beam guardrail, wherein the standard value of the transverse resistance of an upright post under different working conditions is obtained as the evaluation index based on the test method of the transverse resistance trolley of a pile foundation; measuring the physical dimension of the guardrail in situ by means of the existing measuring tool upright post burial depth measuring instrument, the corrugated plate center height measuring instrument, the steel plate thickness measuring instrument, the guardrail upright post spacing measuring instrument and the bolting quantitative evaluation method; measuring the column-soil interaction response parameters in situ by using a force hammer excitation test and a structural dynamic characteristic identification method; the physical size and the column-soil interaction response parameters are used as the input of a column transverse resistance in-situ nondestructive testing instrument to obtain the transverse resistance of the actual guardrail column; and comparing the standard value with the measured value to realize the in-situ nondestructive testing of the protection grade of the guardrail of the waveform beam. Compared with the prior art, the invention has the beneficial effects that: the existing detection method is utilized to realize the in-situ nondestructive detection of the collision protection level of the wave beam guardrail.
Description
Technical Field
The invention relates to the field of nondestructive testing, in particular to an evaluation index and an evaluation method for detecting the collision protection level of a waveform beam guardrail.
Background
The current Highway guardrail safety performance evaluation Standard (JTG/TF 83-01-2013) adopts a real vehicle test to evaluate the guardrail protection grade. The waveform beam guardrails of each grade are used for selecting small-sized coaches, medium (large) coaches and medium (large) vans with different qualities and different speeds according to the protection grade to carry out the real-vehicle collision test according to the application road sections. However, the real vehicle crash test is a destructive test, requires specialized equipment, and consumes a lot of manpower, material resources, and financial resources.
With the development of nondestructive testing technology, the technology for detecting the height, the burial depth of the upright posts, the thickness of materials and the integrity of components of the guardrail is fully developed, the physical size of the corrugated beam guardrail can be rapidly obtained, and the dynamic response parameters of the pile foundation structure based on the excitation of the force hammer can also be rapidly used for quantitatively evaluating the interaction of the post and soil. Therefore, the transverse resistance of the guardrail upright post can be used as an evaluation standard value through the existing detection technology, the transverse resistance of the actual guardrail upright post is used as a detection value, and whether the guardrail achieves the standard protection capability or not is judged through comparison analysis, so that the guardrail protection grade is evaluated.
Chinese patent CN 104568617A discloses a method for evaluating impact resistance of highway anti-collision guardrail plate, according to the principle that the collision energy of real vehicle test is equal to the collision energy between drop hammer and guardrail plate, the drop hammer mass and drop hammer release height are adjusted, and the deformation of guardrail plate is observed to determine the impact resistance of guardrail plate. The method is a destructive collision test, the guardrail plate is damaged after impact and cannot be used, the interaction relation between guardrail posts and soil is not considered, and the collision protection grade of the corrugated beam guardrail cannot be evaluated by the method.
Chinese patent CN 115219324A discloses a rapid assessment method for the protection capability of a highway wave beam guardrail, a relation model between the top thrust F, the horizontal displacement s and the protection energy Q acting on the wave beam guardrail is constructed, the response displacement of a wave beam plate along the top thrust direction can be recorded by measuring the horizontal displacement of a loading plate, the record of the top thrust in the pushing process of the wave beam guardrail is realized by a pressure sensor arranged at the rear side of a pushing jack, and finally the assessment of the protection capability of the wave beam guardrail is realized by constructing the relation among the top thrust, the response displacement and the protection energy of the wave beam guardrail. The method adopts a quasi-static loading mode of the jack, and omits the strain rate effect of the steel; the method is a destructive test and can not realize nondestructive detection.
Disclosure of Invention
The invention aims to solve the problem that the protection grade of a waveform beam guardrail cannot be evaluated when a newly built road waveform beam guardrail is subjected to completion acceptance and the built road waveform beam guardrail is subjected to active maintenance, and provides an evaluation index and an evaluation method for detecting the collision protection grade of the waveform beam guardrail.
S1: making a trolley test plan for obtaining the transverse resistance of the upright post;
s2: obtaining a standard value of the transverse resistance of the upright post at a specific installation position under a specific working condition by using a trolley test;
s3: measuring the column spacing by using a column spacing measuring instrument; measuring the burial depth of the upright post by adopting an upright post burial depth detection instrument; measuring the central height of the corrugated plate by adopting a corrugated plate central height measuring instrument; measuring the thickness of each part of the guardrail by adopting a steel plate thickness gauge; the reliability of the current bolting is evaluated by adopting a bolting state quantitative evaluation method;
s4: acquiring dynamic response parameters of column-soil interaction by adopting a force hammer excitation response test and a structural power recognition method;
s5: the measurement results obtained in S3 and S4 are used as input parameters of a nondestructive testing instrument for the transverse resistance of the upright post to obtain a field upright post transverse resistance measurement value;
s6: and (5) analyzing the measured value of the S5 and the standard value of the S1 to evaluate the collision protection level of the guardrail of the waveform beam.
Preferably, the evaluation index of the collision protection level of the wavy beam guardrail is a transverse resistance standard value of the upright post of the wavy beam guardrail.
Preferably, the method for acquiring the standard value of the transverse resistance of the guardrail column of the wave beam is a trolley test; the trolley impact head is in a quarter cylinder shape; and the contact surface of the impact head and the upright post is covered by a three-dimensional force sensor.
Preferably, the trolley test plan in the step S1 is a trolley test plan required under standard working conditions (including collision conditions, guardrail structure dimensions, guardrail installation dimensions and roadbed conditions) in combination with highway traffic safety facility design rules, highway guardrail safety performance evaluation standards and highway roadbed construction technical specifications.
Preferably, the physical dimensions of the guardrail obtained in the step S3 are obtained by a column spacing measuring instrument, a column embedding depth detecting instrument, a corrugated plate center height measuring instrument, a steel plate thickness measuring instrument and a quantitative assessment method of the bolting state.
Preferably, the pillar-soil interaction dynamic response parameters obtained in step S4 are obtained by a force hammer excitation response test and a structural power recognition method.
Preferably, in step S5, the column transverse resistance measurement is obtained using a column transverse resistance in situ nondestructive testing instrument.
Preferably, the steps S3, S4, S5, S6 are in-situ tests, and the test object and the test background are evaluation tests of the protection level of the wavy beam guardrail during the completion acceptance of the newly built highway facility and the active maintenance of the established highway facility.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that: the problem that the protection grade of the waveform beam guardrail cannot be evaluated when the waveform beam guardrail of the newly-built highway is subjected to completion acceptance and active maintenance is solved by utilizing the existing nondestructive testing technology.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the present patent, and the technical aspects of the present invention are further described below with reference to the drawings and examples.
Example 1:
for a typical corrugated beam guardrail, a quantitative evaluation is made on the collision protection level thereof through the following steps.
S1: and (3) making a trolley test plan for acquiring the transverse resistance of the upright post. Firstly, the structural size, the installation position, the real vehicle test condition and the roadbed condition of each protection level waveform beam guardrail are determined by referring to highway traffic safety facility design rules, expressway guardrail safety performance evaluation standards and highway roadbed construction technical specifications. Thus completing the test planning of the trolley for obtaining the transverse resistance of the upright post.
S2: and (3) utilizing a collision test platform to expand a destructive collision test for the trolley test planned in the step (S1) to obtain the standard value of the transverse resistance of the guardrail upright post. The method comprises the steps of adopting a test trolley with a quarter cylinder-shaped impact head, covering the contact surface of the impact head and a stand column by using a three-dimensional force sensor, adopting an off-line data acquisition system arranged at the tail end of the trolley to acquire and store data of the three-dimensional force sensor, and matching with an off-line data processing system. Before the collision test starts, the off-line data acquisition system adopts a wired communication mode, and is matched with a test computer and upper computer control software installed on the test computer to set related parameters; in the test, the off-line data acquisition system synchronously acquires the data of the three-dimensional force sensor and stores the data in real time; after the test, the off-line data acquisition and recording system is taken down, the stored data is downloaded to the test computer through network cable communication, and the collision force data is read by utilizing data processing software and analyzed and processed.
S3: the method for testing the collision protection level of the wave beam guardrail in the field comprises the following steps:
s31: measuring the column spacing by using a column spacing measuring instrument; measuring the burial depth of the upright post by adopting an upright post burial depth detection instrument; measuring the central height of the corrugated plate by adopting a corrugated plate central height measuring instrument; measuring the thickness of each part of the guardrail by adopting a steel plate thickness gauge; and (3) evaluating the reliability of the current bolting by adopting a quantitative assessment method of the bolting state, and finally recording the physical dimensions of all the waveform beam guardrails.
S32: and acquiring dynamic response parameters of the column-soil interaction by adopting a force hammer excitation response test and a structural dynamic recognition method.
S33: and S31 and S32 are used for obtaining physical dimensions of the wave beam guard rail and dynamic response parameters of column-soil interaction as input of a column transverse resistance in-situ nondestructive testing instrument to obtain actual transverse resistance of the column.
S34: and (3) comparing and analyzing the actual measured value in the step (S33) with the standard value in the step (S2) to realize the in-situ nondestructive evaluation of the actual collision protection level of the wave beam guardrail.
The invention provides an evaluation index and an evaluation method for detecting the collision protection level of a waveform beam guardrail, wherein the standard value of the transverse resistance of an upright post under different working conditions is obtained as the evaluation index based on the test method of a transverse resistance trolley of a pile foundation; with the help of existing measuring tools: the physical dimensions of the guardrails are measured in situ by a vertical column burial depth detection instrument, a corrugated plate center height measuring instrument, a steel plate thickness measuring instrument, a guardrail vertical column spacing measuring instrument and a bolting quantitative evaluation method; measuring the column-soil interaction response parameters in situ by using a force hammer excitation test and a structural dynamic characteristic identification method; the physical size and the column-soil interaction response parameters are used as the input of a column transverse resistance in-situ nondestructive testing instrument to obtain the transverse resistance of the actual guardrail column; and comparing the standard value with the measured value to realize the in-situ nondestructive testing of the protection grade of the guardrail of the waveform beam. Compared with the prior art, the technical scheme of the invention has the beneficial effects that: the existing detection method is utilized to realize the in-situ nondestructive detection of the collision protection level of the wave beam guardrail.
It should be understood that the above-described embodiments of the present invention are provided by way of example only and are not intended to limit the scope of the invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (7)
1. An evaluation index and an evaluation method for detecting collision protection grade of a waveform beam guardrail are characterized in that: the standard value of the transverse resistance of the upright post under different working conditions is obtained by using a test method based on the transverse resistance trolley of the pile foundation as an evaluation index; the physical size of the guardrail and the dynamic response parameters of column-soil interaction are measured in the field by means of the existing measuring tool and measuring method, and the actual column transverse resistance value is obtained by taking the physical size of the guardrail and the dynamic response parameters of column-soil interaction as the input of a column transverse resistance in-situ nondestructive testing instrument; the on-site nondestructive detection of the collision protection level of the waveform beam guardrail is realized through the comparative analysis of the actual measured value and the standard value, and the specific implementation steps are as follows:
s1: making a trolley test plan for obtaining the transverse resistance of the upright post;
s2: obtaining a standard value of the transverse resistance of the upright post at a specific installation position under a specific working condition by using a trolley test;
s3: measuring the column spacing by using a column spacing measuring instrument; measuring the burial depth of the upright post by adopting an upright post burial depth detection instrument; measuring the central height of the corrugated plate by adopting a corrugated plate central height measuring instrument; measuring the thickness of each part of the guardrail by adopting a steel plate thickness gauge; the reliability of the current bolting is evaluated by adopting a bolting state quantitative evaluation method;
s4: acquiring dynamic response parameters of column-soil interaction by adopting a force hammer excitation response test and a structural power recognition method;
s5: the measurement results obtained in S3 and S4 are used as input parameters of a nondestructive testing instrument for the transverse resistance of the upright post to obtain a field upright post transverse resistance measurement value;
s6: and (3) through analyzing the measured value of the S5 and the standard value of the S1, the nondestructive evaluation of the field collision protection level of the wave-shaped beam guardrail is realized.
2. The evaluation index and the evaluation method for detecting the collision protection level of the wavy beam guardrail according to claim 1, wherein the evaluation index is a guardrail column transverse resistance standard value.
3. The evaluation index and the evaluation method for detecting the collision protection level of the wavy beam guardrail according to claim 1, wherein the trolley test plan in the step S1 is combined with the requirements of highway traffic safety facility design, expressway guardrail safety performance evaluation standard and highway subgrade construction technical specification to determine the required trolley test scheme under standard working conditions.
4. The evaluation index and the evaluation method for detecting the collision protection level of the wavy beam guardrail according to claim 1, wherein the trolley test method in the step S2 is a destructive collision test, a real vehicle collision test is required, and a quarter cylinder trolley collision head is adopted; and the contact surface of the impact head and the upright post is covered by a three-dimensional force sensor.
5. The evaluation index and the evaluation method for detecting the collision protection level of the wavy girder guard rail according to claim 1, wherein the tool and the method for obtaining the physical dimension of the wavy girder guard rail in the step S3 are a column spacing measuring instrument, a column embedding depth detecting instrument, a wavy girder center height measuring instrument, a steel plate thickness gauge and a quantitative evaluation method for the bolting state.
6. The evaluation index and the evaluation method for detecting the collision protection level of the wavy beam guardrail according to claim 1, wherein the tool and the method for acquiring the post-soil interaction dynamics response parameters in the step S4 are a force hammer excitation response test and a structural power recognition method.
7. The evaluation index and the evaluation method for detecting the collision protection level of the wavy girder guardrail according to claim 1, wherein the steps S3, S4, S5 and S6 are in-situ tests, and the test object and the test background are evaluation tests of the protection level of the wavy girder guardrail during completion acceptance of new highway facilities and active maintenance of established highway facilities.
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| CN202310346227.0A CN116362616A (en) | 2023-04-03 | 2023-04-03 | Evaluation index and evaluation method for detecting collision protection grade of waveform beam guardrail |
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