CN107588809B - A kind of frictional high-strength bolts in rod piece connecting node fall off recognition methods - Google Patents
A kind of frictional high-strength bolts in rod piece connecting node fall off recognition methods Download PDFInfo
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Abstract
It falls off recognition methods the invention discloses the frictional high-strength bolts in a kind of rod piece connecting node, step 10) lays measuring point on rod piece connecting node splice plate, and temperature sensor and fiber Bragg grating strain sensor is arranged on each measuring point；Step 20) establishes the axial strain of each point position with the linear change rate in temperature field；Step 30) establishes linear change rate along the distribution curve of rod piece cross-sectional direction；Step 40) integrates every distribution curve that step 30) is established, and obtains corresponding integrated value；Step 50) calculate adjacent integrated values first-order difference absolute value, using its along bar axis direction distribution curve as fundamental curve；Step 60) return step 20), first-order difference absolute value is obtained in the r days real-time curves along bar axis direction；Step 70) carries out the identification that falls off to bolt using the difference of real-time curve and fundamental curve.Recognition methods of the invention can accurately identify that high-strength bolt falls off position.
Description
Technical field
The invention belongs to truss structure health monitorings and security performance assessing field, it particularly relates to arrive a kind of rod piece
Frictional high-strength bolts in connecting node fall off recognition methods.
Background technique
In high-speed railway bridge, this kind of bridge structure formal cause of steel girder bridge have concurrently compared with large span, compared with light dead-weight and compared with
The advantages that strong rigidity and be widely adopted.For example, the wide railway Guangzhou hinge in your Guangnan is across water channel grand bridge of conquering east, (2014 logical
Vehicle), Beijing-Shanghai High-Speed Railway Nanjing Foundations of Dashengguan Changjiang River Bridge (being open to traffic for 2011) and Wuhan-Guangzhou passenger-dedicated line Tianxingzhou Yangtse Bridge
(being open to traffic within 2009).The rod piece connection of high-speed railway steel girder bridge generallys use high-strength friction bolt connection mode.This company
The mode of connecing is by splice plate contact surface frictional force Transfer of Shear under the pretightning force of frictional high-strength bolts, in Anti-Sliding Design
When frictional force do not allow more than limiting condition, thus have it is shear-deformable it is small, anti-fatigue ability is strong and is suitable for bearing power lotus
The advantages that load.
However, the generally existing high-strength bolt of connecting node in high-speed railway steel girder bridge is disconnected under practical Service Environment
Split problem.For example, Nanjing Foundations of Dashengguan Changjiang River Bridge was started operation from 2011 to 2016, panel point is existing 277 sets high
Strength bolt is broken.High-strength bolt, which is broken, can not only reduce the resistant slide bearing capacity of panel point, also result in splice plate and
Redistribution phenomenon occurs for remaining high-strength bolt stress condition, and then threatens the shear transmitting of rod piece connecting node.It is existing
Studies have shown that can easily lead to remaining high-strength bolt institute after power transmission is reached a certain level than big high-strength bolt number of breaks
It is more than its shear-carrying capacity by shearing and shearing slip destruction occurs.It is supported since bridge is daily and repairs operation there are inspection cycle (examples
As Nanjing Foundations of Dashengguan Changjiang River Bridge monthly checks one time), and daily support is repaired operation and must be carried out in skylight point, and maintenance people is caused
Member can not have found in time and replace break bolt.It is de- that research at present is not yet clearly given at frictional high-strength bolts under Service Environment
Recognition methods is fallen, continues to be on active service and there is peace in the case where causing many high-speed rail bridge panel points to be still in high-strength bolt fracture
Full hidden danger.
Therefore, research frictional high-strength bolts under Service Environment fall off recognition methods, have Important Academic value and work
Cheng Yiyi.
Summary of the invention
Technical problem: being difficult to solve the problems, such as that frictional high-strength bolts fall off, and the present invention proposes a kind of rod piece connection
Whether the frictional high-strength bolts in node fall off recognition methods, taken off with the frictional high-strength bolts identified in rod piece connecting node
It falls, it is ensured that the trouble free service of bridge formation.
Technical solution: in order to solve the above technical problems, the embodiment of the present invention provides the friction in a kind of rod piece connecting node
Type high-strength bolt falls off recognition methods, and this method comprises the following steps:
Step 10) lays measuring point on rod piece connecting node splice plate, and temperature sensor and optical fiber light is arranged on each measuring point
Grid strain transducer is monitored and is acquired using temperature sensor the temperature field on connecting node splice plate, answered using fiber grating
Become sensor to monitor and acquire the axial strain on connecting node splice plate；
Step 20) establishes the axial strain of each point position with the linear change rate in temperature field；
Step 30) establishes linear change rate along the distribution curve of rod piece cross-sectional direction using lagrange-interpolation；
Step 40) integrates every distribution curve that step 30) is established, and obtains corresponding integrated value；
Step 50) calculate adjacent integrated values first-order difference absolute value, using its along bar axis direction distribution curve as base
This curve；
Step 60) return step 20), first-order difference absolute value is obtained in the r days real-time curve D along bar axis directionx,r；
The r days within rod piece military service initial stage；By the 1st day first-order difference absolute value along the distribution curve D of coordinate xx,1, as a scale
Fundamental curve of the score value along bar axis direction；
Step 70) carries out the identification that falls off to bolt using the difference of real-time curve and fundamental curve.
As preference, the step 10) is specifically included: setting rod piece connecting node includes n row m column friction-type bolt, row
Direction be rod piece axial direction, the directions of column is rod piece cross-sectional direction；On splice plate between each column friction-type bolt
Temperature sensor and fiber Bragg grating strain sensor are evenly arranged along column direction, wherein l column temperature sensor and fiber grating
The arrangement quantity of strain transducer is 2n, l=1,2 ..., m-1；The monitoring time section of temperature field and axial strain is rod piece clothes
0 point to 6 points of morning, sample frequency 1Hz of the 1st day of labour initial stage, the measuring point of temperature sensor and fiber Bragg grating strain sensor
Sum is 2 (m-1) n.
As preference, the step 20) is specifically included: establishing the axial strain of each point position as shown in formula (1)
With the linear change rate in temperature field:
In formula, kl,i,dIndicate linear change of i-th of the measuring point of l column in 0 point to 6 points of axial strain in the d days with temperature field
Rate, N indicate Tl,i,dData count, Tl,i,d(j) T is indicatedl,i,dIn j-th of value, Tl,i,dIndicate that i-th of measuring point of l column exists
The d days 0 point of temperature datas monitored to 6 points, Sl,i,d(j) S is indicatedl,i,dIn j-th of value, Sl,i,dIndicate l column i-th
Measuring point in the d days 0 point to 6 points axial strain data monitored, i=1,2 ..., 2n；D=d1+ 1, d1Indicate that step 60) returns
The number of step 20)；d1Initial value be 0.
As preference, the step 30) was specifically included: for the d days linear change rate k of ll,i,d, by kl,1,d,
kl,2,d,...,kl,2n-1,d,kl,2n,dAs interpolation knot, the linear change rate edge l is established using lagrange-interpolation
The distribution curve of rod piece cross-sectional direction, as shown in formula (2):
In formula, y indicates the coordinate along rod piece cross-sectional direction, and y value is the real number in section [1,2n]；kl,y,dIndicate the
Distribution curve of the linear change rate of l along coordinate y；L (y, i) indicates kl,y,dLagrange interpolation coefficient, as shown in formula (3):
As preference, the step 40) is specifically included: being distributed using formula (4) to every
Curve is integrated along coordinate y, obtains the integrated value I of every curvel,d:
As preference, the step 50) is specifically included: by the integrated value I of every curvel,dAccording to rod piece axial position
It is arranged, obtains integral value sequence qd=[I1,d、I2,d、…、Im-1,d]；Before first integrated value in integral value sequence
With the trailing zero of the last one integrated value, integrated value zero padding sequence Q is obtainedd=[0, I1,d、I2,d、…、Im-1,d,0]；Utilize formula
(5) calculating integral value zero padding sequence QdFirst-order difference absolute value:
Dt,d=| Qd(t+1)-Qd(t) | formula (5)
In formula, Dt,dIndicate t-th of first-order difference absolute value in the d days, t=1,2 ..., m, Qd(t) integrated value is indicated
Zero padding sequence QdIn t-th of value, Qd(t+1) integrated value zero padding sequence Q is indicateddIn (t+1) a value,
All first-order difference absolute values constitute sequence W=[D1,d,D2,d,...,Dm,d], by each value in sequence W as drawing
Ge Lang interpolation knot calculates first-order difference absolute value along the distribution curve of bar axis direction using formula (6):
In formula, x indicates the coordinate along bar axis direction, and x value is the real number in section [1, m]；Dx,dIndicate the one of the d days
Distribution curve of the order difference absolute value along coordinate x；Dt,dIndicate t-th of first-order difference absolute value in the d days；J (x, t) is indicated
Dx,dLagrange interpolation coefficient, as shown in formula (7):
As preference, the step 70) is specifically included: calculating real-time curve D using formula (8)x,rWith fundamental curve Dx,1
Between difference curve Cx,r:
Cx,r=Dx,r-Dx,1Formula (8)
T is substituted into x, t-th of difference C at the r days 0 point to 6 of morning is obtainedt,r, t expression t column friction-type bolt；
If Ct,rLess than threshold value, then show that there are dropping situations for t column frictional high-strength bolts；
If Ct,rMore than or equal to threshold value, then show that the installation of t column frictional high-strength bolts is firm.
As preference, the threshold value is-Dt,1/5。
The utility model has the advantages that compared with prior art, the invention has the following advantages that under practical Service Environment, steel girder bridge
The generally existing high-strength bolt of connecting node in rod piece falls off problem, however research at present not yet clearly provides high-strength bolt and falls off
Recognition methods can only increase the inspection frequency of high-strength bolt, find as early as possible by can be shortened the daily feeding inspection cycle for repairing operation
Simultaneously replacement is replenished in time in the high-strength bolt of fracture, and the node is kept to be in normal stress.But it supports and repairs since bridge is daily
Operation is there are inspection cycle, and daily support is repaired operation and must be carried out in skylight point, causes service personnel that can not find in time simultaneously
Break bolt is replaced, so that high-speed rail bridge panel point continues to be on active service and there is safety in the case where being still in high-strength bolt fracture
Hidden danger.Therefore, the present invention is based on true temperature field and strain effect monitoring data, proposes in a kind of rod piece connecting node
The precise recognition method that high-strength bolt falls off can accurately identify that high-strength bolt falls off position, compensate for research at present and exist
High-strength bolt, which falls off, identifies the research blank of aspect, must be widely popularized and be applied in practical projects.
Detailed description of the invention
Fig. 1 is the friction-type connection node schematic diagram of Foundations of Dashengguan Changjiang River Bridge in the embodiment of the present invention；
Fig. 2 is certain block splice plate schematic diagram of connecting node in the embodiment of the present invention；
Fig. 3 is the absolute value sequence [D of first-order difference in the embodiment of the present invention1,1,D2,1,...,Dm,1] schematic diagram；
Fig. 4 is first-order difference absolute value in the embodiment of the present invention along the fundamental curve and real-time curve chart of bar axis direction；
T-th of difference C when Fig. 5 is the r days 0 point to 6 of morning in the embodiment of the present inventiont,rCurve graph.
Specific embodiment
Technical solution of the present invention is described in detail below.
Frictional high-strength bolts in a kind of rod piece connecting node of the embodiment of the present invention fall off recognition methods, including as follows
Step:
Step 10) lays measuring point on rod piece connecting node splice plate, and temperature sensor and optical fiber light is arranged on each measuring point
Grid strain transducer is monitored and is acquired using temperature sensor the temperature field on connecting node splice plate, answered using fiber grating
Become sensor to monitor and acquire the axial strain on connecting node splice plate.
The step 10) specifically includes: setting rod piece connecting node includes n row m column friction-type bolt, and capable direction is rod piece
Axial direction, the direction of column are rod piece cross-sectional direction；Along column direction on splice plate between each column frictional high-strength bolts
It is evenly arranged temperature sensor and fiber Bragg grating strain sensor, wherein l column temperature sensor and fiber grating strain sensor
The arrangement quantity of device is 2n.When arranging quantity is 2n, it can more reflect splicing plate temperature and strain along rod piece cross section comprehensively
The characteristic distributions in direction.L=1,2 ..., m-1；The monitoring time section of temperature field and axial strain is the 1 of rod piece military service initial stage
0 point to 6 points, sample frequency 1Hz of its morning, the measuring point sum of temperature sensor and fiber Bragg grating strain sensor is 2 (m-
1)n.At 0 point to 6 of morning, rod piece temperature field is more uniform, can be effectively prevented from the interference of complicated gradient temperature field.
Step 20) establishes the axial strain of each point position with the linear change rate in temperature field.
The step 20) specifically includes: establishing the axial strain of each point position as shown in formula (1) with the line in temperature field
Property change rate:
In formula, kl,i,dIndicate linear change of i-th of the measuring point of l column in 0 point to 6 points of axial strain in the d days with temperature field
Rate, N indicate Tl,i,dData count, Tl,i,d(j) T is indicatedl,i,dIn j-th of value, Tl,i,dIndicate that i-th of measuring point of l column exists
The d days 0 point of temperature datas monitored to 6 points, Sl,i,d(j) S is indicatedl,i,dIn j-th of value, Sl,i,dIndicate l column i-th
Measuring point in the d days 0 point to 6 points axial strain data monitored, i=1,2 ..., 2n；D=d1+ 1, d1Indicate that step 60) returns
The number of step 20)；d1Initial value be 0.For example, temperature sensor and fiber Bragg grating strain sensor on each measuring point every
1s acquires a temperature value and strain value respectively, and there are one-to-one relationships for the temperature field of each measuring point and axial strain.
Step 30) establishes linear change rate along the distribution curve of rod piece cross-sectional direction using lagrange-interpolation.
The step 30) specifically included: for the d days linear change rate k of ll,i,d, by kl,1,d,kl,2,d,...,
kl,2n-1,d,kl,2n,dAs interpolation knot, the linear change rate of l is established along rod piece cross section using lagrange-interpolation
The distribution curve in direction, as shown in formula (2):
In formula, y indicates the coordinate along rod piece cross-sectional direction, and y value is the real number in section [1,2n]；kl,y,dIndicate the
Distribution curve of the linear change rate of l along coordinate y；L (y, i) indicates kl,y,dLagrange interpolation coefficient, as shown in formula (3):
Step 40) integrates every distribution curve that step 30) is established, and obtains corresponding integrated value.
The step 40) specifically includes: being integrated to every distribution curve along coordinate y using formula (4), obtains every song
The integrated value I of linel,d:
Step 50) calculate adjacent integrated values first-order difference absolute value, using its along bar axis direction distribution curve as base
This curve.
The step 50) specifically includes: by the integrated value I of every curvel,dIt is arranged, is obtained according to rod piece axial position
To integral value sequence qd=[I1,d、I2,d、…、Im-1,d]；Integral value sequence in first integrated value before and the last one
The trailing zero of integrated value obtains integrated value zero padding sequence Qd=[0, I1,d、I2,d、…、Im-1,d,0]；Since first row friction-type is high
Splice plate strain on the left of strength bolt and the splice plate on the right side of last column frictional high-strength bolts strain equal very little, therefore do not have
Strain transducer is installed on the splice plate of this position at two, but is needed when falling off to frictional high-strength bolts and carrying out discriminance analysis
This position at two is used, therefore before first integrated value in integral value sequence and the last one integrated value trailing zero.
Utilize formula (5) calculating integral value zero padding sequence QdFirst-order difference absolute value:
Dt,d=| Qd(t+1)-Qd(t) | formula (5)
In formula, Dt,dIndicate t-th of first-order difference absolute value in the d days, t=1,2 ..., m, Qd(t) integrated value is indicated
Zero padding sequence QdIn t-th of value, Qd(t+1) integrated value zero padding sequence Q is indicateddIn (t+1) a value, all first-order differences
Absolute value constitutes sequence W=[D1,d,D2,d,...,Dm,d], it regard each value in sequence W as Lagrange's interpolation node, utilizes formula
(6) first-order difference absolute value is calculated along the distribution curve of bar axis direction:
In formula, x indicates the coordinate along bar axis direction, and x value is the real number in section [1, m]；Dx,dIndicate the one of the d days
Distribution curve of the order difference absolute value along coordinate x；Dt,dIndicate t-th of first-order difference absolute value in the d days；J (x, t) is indicated
Dx,dLagrange interpolation coefficient, as shown in formula (7):
Step 60) return step 20), first-order difference absolute value is obtained in the r days real-time curve D along bar axis directionx,r；
The r days within rod piece military service initial stage；By the 1st day first-order difference absolute value along the distribution curve D of coordinate xx,1, as a scale
Fundamental curve of the score value along bar axis direction.
Step 70) carries out the identification that falls off to bolt using the difference of real-time curve and fundamental curve.
The step 70) specifically includes: calculating real-time curve D using formula (8)x,rWith fundamental curve Dx,1Between difference it is bent
Line Cx,r:
Cx,r=Dx,r-Dx,1Formula (8)
T is substituted into x, t-th of difference C at the r days 0 point to 6 of morning is obtainedt,r, the t expression high-strength spiral shell of t column friction-type
Bolt；
If Ct,rLess than threshold value, then show that there are dropping situations for t column frictional high-strength bolts；
If Ct,rMore than or equal to threshold value, then show that the installation of t column frictional high-strength bolts is firm.
Wherein, the threshold value is preferably-Dt,1/5.When threshold value is-Dt,1When/5, it can preferably identify that friction-type is high-strength
The dropping situations of bolt.
In the embodiment of the present invention, frictional high-strength bolts fracture can change the Strain Distribution situation in splice plate, therefore logical
The Variation Features of splice plate Strain Distribution situation under the practical Service Environment of real-time capture are crossed, and establish frictional high-strength bolts fracture
Internal association characteristic between position and splice plate Strain Distribution situation Variation Features can realize that frictional high-strength bolts are broken
Identification.
Below by taking the frictional high-strength bolts of Nanjing Foundations of Dashengguan Changjiang River Bridge fall off identification as an example, illustrate of the invention specific
Implementation process.
Step 10): rod piece be on active service initial stage the 1st day 0 point to 6 points of morning, to the temperature field on connecting node splice plate
Long term monitoring and data acquisition are carried out with axial strain；
Some rod piece connecting node of Nanjing Foundations of Dashengguan Changjiang River Bridge is as shown in Figure 1.The node is located at Nanjing and wins customs director completely
The top boom position of the side Jiang great Qiao purlin span centre position, this node are the box-type section node with ribbed stiffener and the edge of a wing, altogether include 728
A frictional high-strength bolts and 24 pieces of splice plates.Certain block splice plate of this connecting node (only investigates its symmetrical portion as shown in Figure 2
Point).The symmetric part of this splice plate includes that (wherein capable direction is rod piece axial direction, column to 8 row, 10 column frictional high-strength bolts
Direction be rod piece cross-sectional direction), be evenly arranged temperature along column direction on the splice plate between each column frictional high-strength bolts
Sensor and fiber Bragg grating strain sensor are spent, wherein the arrangement number of l column temperature sensor and fiber Bragg grating strain sensor
Amount is 16, l=1,2 ..., 9.The monitoring time section of temperature field and axial strain is the 1st day morning 0 at rod piece military service initial stage
O'clock to 6 points, sample frequency 1Hz, the measuring point total number of temperature sensor and fiber Bragg grating strain sensor is 144；
Step 20): the axial strain of each point position is calculated with the linear change rate in temperature field；
Temperature sensor and fiber Bragg grating strain sensor on each measuring point every 1s acquire respectively a temperature value and
Strain value, therefore there are one-to-one relationships for the temperature field of each measuring point and strain.Establish each point position as shown in formula (1)
Axial strain with temperature field linear change rate:
In formula, d=d1+ 1, d1Indicate step 60) return step 20) number；d1Initial value be 0.It is calculated when first time
When, kl,i,dFor kl,i,1。kl,i,1Indicate i-th of measuring point of l column on day 10 point to 6 points of axial strain with the linear of temperature field
Change rate.
Step 30): linear change rate is established along the distribution curve of rod piece cross-sectional direction using lagrange-interpolation；
For the d days linear change rate k of ll,i,d, by kl,1,d,kl,2,d,...,kl,2n-1,d,kl,2n,dAs interpolation section
Point establishes the linear change rate of l along the distribution curve of rod piece cross-sectional direction, such as formula (2) using lagrange-interpolation
It is shown:
In formula, y indicates the coordinate along rod piece cross-sectional direction, and y value is the real number in section [1,16] range.
Step 40): integrating every distribution curve and obtains corresponding integrated value: bent to every distribution using formula (4)
Line is integrated along coordinate y, obtains the integrated value I of every curvel,d:
Step 50): calculating the first-order difference absolute value of adjacent integrated values, using its along bar axis direction distribution curve as base
This curve:
By the integrated value I of every curvel,dIt is arranged according to rod piece axial position, obtains integral value sequence qd=[I1,d、
I2,d、…、Im-1,d]；Trailing zero before first integrated value in integral value sequence with the last one integrated value, is accumulated
Score value zero padding sequence Qd=[0, I1,d、I2,d、…、Im-1,d,0]；Since the splice plate on the left of first row frictional high-strength bolts is answered
Become and last column frictional high-strength bolts on the right side of splice plate strain equal very little, therefore not at this at two position splice plate
Upper installation strain transducer, but need when falling off to frictional high-strength bolts and carrying out discriminance analysis to use this position at two, because
This integral value sequence in first integrated value before and the last one integrated value trailing zero.
Utilize formula (5) calculating integral value zero padding sequence QdFirst-order difference absolute value:
Dt,d=| Qd(t+1)-Qd(t) | formula (5)
All first-order difference absolute values constitute sequence W=[D1,d,D2,d,...,Dm,d], by each value in sequence W as drawing
Ge Lang interpolation knot calculates first-order difference absolute value along the distribution curve of bar axis direction using formula (6):
In formula, J (x, t) indicates Dx,dLagrange interpolation coefficient, as shown in formula (7):
For first day, formula (5) calculating integral value zero padding sequence Q is utilizeddFirst-order difference absolute value:
Dt,d=| Qd(t+1)-Qd(t) | formula (5)
All first-order difference absolute values constitute sequence [D in 1st day1,1,D2,1,...,Dm,1], such as the histogram in Fig. 3
It is shown.By D1,1,D2,1,...,Dm,1As Lagrange's interpolation node, a 1st day scale is calculated using formula (6) and formula (7)
Divide absolute value along the distribution curve of bar axis direction:
In formula, x indicates that x value is the real number in section [1, m] range along the coordinate along bar axis direction；Dx,1Indicate one
Order difference absolute value along coordinate x distribution curve (as x=t, Dx,1As t-th of first-order difference absolute value Dt,1)；J(x,t)
Indicate Dx,1Lagrange interpolation coefficient.By Dx,1As difference value along the basic distribution curve of bar axis direction, such as the void in Fig. 4
Shown in line.
Step 60): return step 20), first-order difference absolute value is obtained in the r days real-time curve D along bar axis directionx,r；
The r days within rod piece military service initial stage；By the 1st day first-order difference absolute value along the distribution curve D of coordinate xx,1, as a scale
Fundamental curve of the score value along bar axis direction.
Assuming that the 3rd column and the 4th column frictional high-strength bolts in Fig. 2 were fallen off at the r days of rod piece military service initial stage.
Be on active service 0 point to 6 points of the r days mornings of initial stage in rod piece, on connecting node splice plate temperature field and axial strain grow
Monitoring data are substituted into step 20)~step 50), obtain first-order difference absolute value in the r days realities along bar axis direction by phase monitoring
When curve Dx,r, as shown by the bold lines in fig.
Step 70): the identification that falls off is carried out to bolt using the difference of real-time curve and fundamental curve: is calculated using formula (8) real
When curve Dx,rWith fundamental curve Dx,1Between difference curve Cx,r:
Cx,r=Dx,r-Dx,1Formula (8)
T is substituted into x, t-th of difference C at the r days 0 point to 6 of morning is obtainedt,r, as shown in Figure 5.T-th of difference Ct,r
Size determine the dropping situations of t column frictional high-strength bolts.Threshold value is-Dt,1/5.As can be known from Fig. 4:
As t=3, as can be known from Fig. 4: D3,r=0.33, D3,1=2.31.Therefore C3,r=D3,r-D3,1=0.33-2.31=-
1.98 ,-D3,1/ 5==-0.42；As t=4, as can be known from Fig. 4: D4,r=0.39, D4,1=2.22.Therefore C4,r=D4,r-D4,1
=0.39-2.22=-1.83 ,-D4,1/ 5=-0.40.C as can be seen that work as t=3, when 4t,rIt is significantly less than-Dt,1/ 5, then table
There are dropping situations with the 4th column frictional high-strength bolts for bright 3rd column.
Above embodiments be only the present invention program is further elaborated with, read the embodiment of the present invention it
Afterwards, those of ordinary skill in the art belong to the present patent application right to the modification and replacement of various equivalent forms of the invention and want
The range of protection defined by asking.
Claims (6)
- The recognition methods 1. frictional high-strength bolts in a kind of rod piece connecting node fall off, which is characterized in that this method includes such as Lower step:Step 10) lays measuring point on rod piece connecting node splice plate, and temperature sensor is arranged on each measuring point and fiber grating is answered Become sensor, the temperature field on connecting node splice plate is monitored and acquired using temperature sensor, is passed using fiber grating strain Sensor monitors and acquires the axial strain on connecting node splice plate；Step 20) establishes the axial strain of each point position with the linear change rate in temperature field；Step 30) establishes linear change rate along the distribution curve of rod piece cross-sectional direction using lagrange-interpolation；Step 40) integrates every distribution curve that step 30) is established, and obtains corresponding integrated value；Step 50) calculate adjacent integrated values first-order difference absolute value, using its along bar axis direction distribution curve as substantially bent Line；The step 50) specifically includes: by the integrated value I of every curvel,dIt is arranged, is integrated according to rod piece axial position Value sequence qd=[I1,d、I2,d、…、Im-1,d]；Integral value sequence in first integrated value before and the last one integrated value Trailing zero, obtain integrated value zero padding sequence Qd=[0, I1,d、I2,d、…、Im-1,d,0]；Utilize formula (5) calculating integral value zero padding Sequence QdFirst-order difference absolute value:Dt,d=| Qd(t+1)-Qd(t) | formula (5)In formula, Dt,dIndicate t-th of first-order difference absolute value in the d days, t=1,2, m, Qd(t) integral value complement is indicated Null sequence QdIn t-th of value, Qd(t+1) integrated value zero padding sequence Q is indicateddIn (t+1) a value,All first-order difference absolute values constitute sequence W=[D1,d,D2,d,...,Dm,d], each value in sequence W is bright as glug Day interpolation knot calculates first-order difference absolute value along the distribution curve of bar axis direction using formula (6):In formula, x indicates the coordinate along bar axis direction, and x value is the real number in section [1, m]；Dx,dIndicate the d days scales Divide absolute value along the distribution curve of coordinate x；Dt,dIndicate t-th of first-order difference absolute value in the d days；J (x, t) indicates Dx,d's Lagrange interpolation coefficient, as shown in formula (7):Step 60) return step 20), first-order difference absolute value is obtained in the r days real-time curve D along bar axis directionx,r；The r days Within rod piece military service initial stage；By the 1st day first-order difference absolute value along the distribution curve D of coordinate xx,1, as first-order difference value edge The fundamental curve of bar axis direction；Step 70) carries out the identification that falls off to bolt using the difference of real-time curve and fundamental curve；The step 70) specifically includes: Real-time curve D is calculated using formula (8)x,rWith fundamental curve Dx,1Between difference curve Cx,r:Cx,r=Dx,r-Dx,1Formula (8)T is substituted into x, t-th of difference C at the r days 0 point to 6 of morning is obtainedt,r, t expression t column friction-type bolt；If Ct,rLess than threshold value, then show that there are dropping situations for t column frictional high-strength bolts；If Ct,rMore than or equal to threshold value, then show that the installation of t column frictional high-strength bolts is firm.
- The recognition methods 2. frictional high-strength bolts in rod piece connecting node described in accordance with the claim 1 fall off, feature exist In the step 10) specifically includes: setting rod piece connecting node includes n row m column friction-type bolt, and capable direction is that rod piece is axial Direction, the direction of column are rod piece cross-sectional direction；It is evenly arranged on splice plate between each column friction-type bolt along column direction Temperature sensor and fiber Bragg grating strain sensor, wherein the arrangement of l column temperature sensor and fiber Bragg grating strain sensor Quantity is 2n, l=1,2 ..., m-1；The monitoring time section of temperature field and axial strain is that the 1st day of rod piece military service initial stage is insulted 0 point to 6 points of morning, sample frequency 1Hz, the measuring point sum of temperature sensor and fiber Bragg grating strain sensor is 2 (m-1) n.
- 3. the frictional high-strength bolts in rod piece connecting node fall off recognition methods according to claim 2, feature exists In the step 20) specifically includes: establishing the axial strain of each point position as shown in formula (1) with the linear change in temperature field Rate:In formula, kl,i,dIndicate linear change rate of i-th of the measuring point of l column in 0 point to 6 points of axial strain in the d days with temperature field, N indicates Tl,i,dData count, Tl,i,d(j) T is indicatedl,i,dIn j-th of value, Tl,i,dIndicate i-th of measuring point of l column at the d days 0 point of temperature data monitored to 6 points, Sl,i,d(j) S is indicatedl,i,dIn j-th of value, Sl,i,dIndicate that i-th of measuring point of l column exists The d days 0 point to 6 points axial strain data monitored, i=1,2 ..., 2n；D=d1+ 1, d1Indicate step 60) return step 20) number；d1Initial value be 0.
- The recognition methods 4. frictional high-strength bolts in rod piece connecting node described in accordance with the claim 3 fall off, feature exist In the step 30) specifically includes: for the d days linear change rate k of ll,i,d, by kl,1,d,kl,2,d,...,kl,2n-1,d, kl,2n,dAs interpolation knot, point of the linear change rate of l along rod piece cross-sectional direction is established using lagrange-interpolation Cloth curve, as shown in formula (2):In formula, y indicates the coordinate along rod piece cross-sectional direction, and y value is the real number in section [1,2n]；kl,y,dIndicate that l is arranged Distribution curve of the linear change rate along coordinate y；L (y, i) indicates kl,y,dLagrange interpolation coefficient, as shown in formula (3):
- 5. the frictional high-strength bolts in rod piece connecting node fall off recognition methods according to claim 4, feature exists In the step 40) specifically includes: being integrated to every distribution curve along coordinate y using formula (4), obtain every curve Integrated value Il,d:
- The recognition methods 6. frictional high-strength bolts in rod piece connecting node described in accordance with the claim 1 fall off, feature exist In the threshold value is-Dt,1/5。
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