CN106934114B - Dynamic detection and evaluation method for connection state of pile-beam structure node - Google Patents
Dynamic detection and evaluation method for connection state of pile-beam structure node Download PDFInfo
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Abstract
The application aims at providing a dynamic detection and evaluation method for a node connection state of a pile-beam structure, wherein the pile-beam structure comprises a plurality of pile-beam connecting parts formed by pile base sections and beam sections, and the method comprises the following steps: determining the layout positions of a plurality of detection points on each pile beam connecting part, and arranging a detection device for monitoring each detection point on the pile beam structure; determining a corresponding vibration point according to the layout position so as to generate a vibration wave through the vibration point; and respectively obtaining the propagation speed of the vibration wave on each beam section and the propagation speed of the vibration wave from each beam section to the corresponding pile foundation section according to the time and the layout position of the vibration wave when the detection device detects the vibration wave to reach each detection point, analyzing the propagation speeds according to a mathematical statistics method to obtain an abnormal speed critical value so as to judge the abnormal pile-beam connecting part, and detecting and evaluating the abnormal pile-beam connecting part. Compared with the prior art, the method can realize effective detection of the connection state of the pile-beam structure and evaluation of the overall structure performance.
Description
Technical Field
The invention belongs to the field of constructional engineering, and particularly relates to a dynamic detection and evaluation method for a connection state of a pile-beam structure node.
Background
The pile-beam structure is a common building structure, mainly composed of beams and pile foundations, and widely applied to various building places, such as pile-beam structures like high-pile wharfs.
In the practical application process, the connection state of the pile beam structure has great influence on the stress state and displacement of the built bent frame or frame, and serious accidents can be caused by damage or collapse of the bent frame or frame. However, in the prior art, an effective detection means is lacked in a method for detecting the connection state of the pile-beam structure, so that hidden dangers are easily caused in the actual use process of the built bent frame or frame.
Therefore, how to effectively detect the connection state of the pile-beam structure is a technical problem to be solved at present.
Disclosure of Invention
In view of the above-mentioned shortcomings or drawbacks of the prior art, the present invention is directed to a method for detecting a connection state of a pile beam structure.
In order to solve the technical problem, the invention provides a method for dynamically detecting and evaluating a connection state of a node of a pile-beam structure, wherein the pile-beam structure comprises N pile-beam connection parts consisting of pile foundation sections and beam sections, wherein N is a positive integer greater than 1, and the method comprises the following steps:
step S1: determining the layout positions of M detection points on each pile beam connecting part, and arranging a detection device for monitoring each detection point on the pile beam structure, wherein M is a positive integer greater than 1; selecting corresponding vibration points on the pile beam structure according to the layout positions, and ensuring that the vibration points and the detection points are located on the same reference section, and the reference section is parallel to the central axis of each pile foundation section and penetrates through each pile foundation section so as to generate vibration waves transmitted in the pile beam structure through the vibration points;
step S2: respectively obtaining a first propagation speed of the vibration wave propagating on each beam section and a second propagation speed of the vibration wave from each beam section to the corresponding pile section according to the time for the vibration wave to reach each detection point and the layout position measured by the detection device;
step S3: analyzing the first propagation speed and the second propagation speed according to a mathematical statistical method to obtain an abnormal speed critical value, and judging whether the connection state of each pile beam connecting part is abnormal or not according to the abnormal speed critical value;
step S4: and carrying out stress detection on the structure of the pile beam connecting part with the abnormal connection state, and processing data obtained by the stress detection to obtain a pile beam numerical node model for evaluating the connection state of the pile beam connecting part.
Compared with the prior art, the invention has the following beneficial effects: the invention determines corresponding detection points on the beam section and the pile foundation section of each pile beam connecting part through corresponding layout positions, determines corresponding vibration points according to the layout positions, ensures that the vibration points are propagated on the pile beam structure and in the same plane when being propagated because the vibration points and the detection points are positioned on the same reference plane, and the reference plane is parallel to the axle wire of each pile foundation section, ensures that the distance between the vibration points and the detection points is the transmission distance actually passed by the vibration wave, accurately obtains the propagation speed of the vibration wave on each beam section and the propagation speed on the corresponding pile foundation section according to the time and the layout position when the vibration wave reaches the detection points, and further obtains an abnormal speed critical value by carrying out numerical statistics on the obtained first propagation speed and the second propagation speed through a mathematical statistics method, and judge whether the connection state of each pile beam connecting portion appears unusually with this to the accessible carries out the atress detection to the structure of unusual pile beam connecting portion, obtains corresponding pile beam numerical value node model, so that the user according to each pile beam numerical value node model, realizes effectively detecting the connection state of pile beam structure, and carries out accurate aassessment to the overall structure intensity and the performance of pile beam structure.
Further, step S1 includes the following steps: each beam section is provided with at least two detection points which are respectively positioned at two sides of the corresponding pile foundation section, each pile foundation section is provided with at least one detection point, and the detection points on every two adjacent pile foundation sections are positioned at the same side; the detection points arranged on the beam sections are positioned on the same straight line, and the straight line penetrates through the intersection part of each pile foundation section and the corresponding beam section; the vibration point is located on the straight line or the pile foundation section. Therefore, the path of the vibration wave propagated on the beam section is propagated along the straight line direction passing through each detection point, the distance between every two adjacent detection points on each beam section and the distance between the detection point on each pile foundation section and the detection point on the corresponding beam section are the distance for the vibration wave to pass through, and the first propagation speed and the second propagation speed can be measured only according to the distance between every two adjacent detection points on each beam section, the distance between the detection point on each pile foundation section and the detection point on the corresponding beam section and the measured time on each detection point, so that the detection of workers is facilitated, and the detection precision is improved.
Further, step S3 includes the following steps: step S31: counting all the obtained first propagation speeds and second propagation speeds, averaging the corresponding first propagation speeds and second propagation speeds on the pile-beam connecting parts, and taking the average value as the propagation speed of the vibration wave on the pile-beam connecting part; step S32: carrying out mathematical analysis on the propagation speed of the vibration wave on each pile beam connecting part to obtain an abnormal speed critical value, wherein the abnormal speed critical value comprises an abnormal critical maximum value and an abnormal critical minimum value; step S33: comparing and judging the abnormal speed critical value with the propagation speed of the vibration wave on each pile beam connecting part; step S34: if the propagation velocity value of the vibration wave on the corresponding pile beam connecting part is larger than the abnormal critical minimum value and smaller than the abnormal critical maximum value, judging that the connection state of the pile beam connecting part is normal; otherwise, judging that the connection state of the pile beam connecting part is abnormal. And analyzing the numerical values of the first propagation speed and the second propagation speed in a mathematical statistics mode to obtain an abnormal speed critical value, and judging whether the connection state of the connecting parts of the pile beams is normal or not.
Further, step S4 includes the following steps: step S41; determining test areas on the beam section and the pile foundation section of the abnormal pile-beam connecting part, setting corresponding stress detection points on the test areas, and detecting the stress detection points through the detection device; step S42: processing the stress change data of the detection device on the detected stress detection point according to a corresponding material mechanics formula, and respectively calculating a beam distribution coefficient and a pile foundation distribution coefficient through a bending moment distribution coefficient calculation formula and an axial force distribution coefficient calculation formula; step S43: drawing a beam distribution coefficient time-course curve and a pile foundation distribution coefficient time-course curve according to the beam distribution coefficient, the pile foundation distribution coefficient and corresponding test time; step S44: obtaining corresponding beam distribution coefficient representative values and pile foundation distribution coefficient representative values according to the beam distribution coefficient time-course curve and the pile foundation distribution coefficient time-course curve; step S45: and taking the beam distribution coefficient representative value and the pile foundation distribution coefficient representative value as node numerical values to adjust a pile beam numerical node model which is simulated and established according to the measured data on the abnormal pile beam connecting part, and evaluating the connecting state of the abnormal pile beam connecting part according to the adjusted pile beam numerical node model.
Therefore, the cross beam distribution coefficient representative value and the pile foundation distribution coefficient representative value are obtained through the obtained cross beam distribution coefficient time-course curve and the pile foundation distribution coefficient time-course curve, and the cross beam distribution coefficient representative value and the pile foundation distribution coefficient representative value are used as node numerical values to adjust the pile beam numerical node model, so that a user can better evaluate the connection state of the abnormal pile beam connecting part by adjusting the pile beam numerical node model, the accuracy of an evaluation result is improved, and a worker is prompted to process the abnormal pile beam connecting part according to the evaluation result.
Further, there are the following substeps in the step of step S41: selecting two opposite cross beam test sections which are respectively positioned at two sides of a pile foundation section on a cross beam section of an abnormal pile-beam connecting part, wherein the plane of the cross beam test section is vertical to the length direction of the cross beam section, and selecting a pile foundation test section on the pile foundation section, and the plane of the pile foundation test section is vertical to the length direction of a pile foundation section; symmetrical stress detection points are arranged on two opposite sides of the cross beam testing section and are distributed at equal intervals; the cross section of the pile foundation test is provided with symmetrical stress detection points which are distributed in an encircling manner at equal intervals. Through the distribution and measurement mode, the distribution and the operation of workers are facilitated, the stress generated when the pile foundation test section and the beam test section are stressed can be accurately measured, and the stress can be accurately calculated according to the corresponding formula, so that the precision and the test efficiency of the measurement result are improved.
Further, in order to accurately evaluate the connection state of the abnormal pile beam connection portion, there are the following sub-steps in the step of S42: respectively calculating the bending moment and the axial force on the cross beam test section and the pile foundation test section at the corresponding moment by a bending moment calculation formula and an axial force calculation formula; respectively calculating the bending moment and the axial force through a bending moment distribution coefficient formula and an axial force distribution coefficient formula to obtain the beam distribution coefficient and the pile foundation distribution coefficient; the beam distribution coefficient comprises a beam bending moment distribution coefficient and a beam axial force distribution coefficient, and the pile foundation distribution coefficient comprises a pile foundation bending moment distribution coefficient and a pile foundation axial force distribution coefficient.
Further, the distance between two adjacent detection points on each cross beam section is the same; the distances from the detection points on the pile foundation sections to the corresponding beam sections are the same. The positions of the detection points can be conveniently and uniformly distributed by workers, and the first propagation speed and the second propagation speed can be conveniently calculated, so that the calculation efficiency is improved, and the time is saved.
Further, the vibration point is excited in a knocking mode. The vibration is excited in a knocking mode to replace a machine to generate a vibration source, so that the position of a vibration point can be freely selected by a worker, the actual operation is facilitated, and the detection cost can be saved.
Further, after the step S3, the method further includes the following steps: generating a vibration wave propagated in the pile beam structure through the vibration point again, obtaining a retested first propagation speed and a retested second propagation speed according to data measured by the detection device on the abnormal pile beam connecting part, and taking the average value of the first propagation speed and the second propagation speed as the retested propagation speed of the vibration wave on the pile beam connecting part; and comparing the propagation speed of the retest with the critical value of the abnormal speed to judge whether the pile-beam connecting part needs to be subjected to stress detection. By the method, the phenomenon that measurement errors occur due to external factors such as abnormal assembly of the detection device and the like, so that unnecessary time waste is caused can be avoided.
Further, in step S1, the method further includes the following sub-steps: the method comprises the following steps of dividing M detection points on each pile beam connecting part into at least three groups, wherein the number of the detection points in each group is at least three, and M is larger than 9. Therefore, by arranging a plurality of groups of detection points on each pile beam connecting part, a plurality of first propagation velocity values and second propagation velocity values can be obtained on each pile beam connecting part in each test, so that the propagation velocity values of the vibration waves can be obtained through a statistical method in the following process.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
FIG. 1: the invention discloses a flow chart of a dynamic detection and evaluation method of a pile beam structure node connection state in a first embodiment;
FIG. 2: a partial structural schematic of a reference section of a single pile beam connection of a first embodiment of the invention;
FIG. 3: a flowchart of judging a connection state of an abnormal pile-beam connection portion according to the first embodiment of the present invention;
FIG. 4: a flowchart of a first embodiment of the present invention for detecting and evaluating an abnormal pile-beam connection;
FIG. 5: a schematic structural diagram of a test area according to a first embodiment of the present invention;
FIG. 6: the distribution schematic diagram of each stress detection point on the cross beam test section of the first embodiment of the invention;
FIG. 7: the distribution schematic diagram of each stress detection point on the pile foundation test section in the first embodiment of the invention.
Detailed Description
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
A first embodiment of the present invention provides a method for dynamically detecting and evaluating a joint connection state of a pile-beam structure including a plurality of pile-beam connection portions each formed of a pile base section and a beam section, as shown in fig. 1, the method including the steps of:
step S1: the method comprises the steps of determining the layout positions of a plurality of detection points on each pile beam connecting part, and arranging a detection device for monitoring each detection point on the pile beam structure.
And selecting corresponding vibration points on the pile beam structure according to the layout position, ensuring that the vibration points and the detection points are positioned on the same reference section, and the reference section is parallel to the central axis of each pile foundation section and penetrates through each pile foundation section so as to generate vibration waves propagated in the pile beam structure through the vibration points, and if the vibration waves can be excited in a knocking mode.
Step S2: and respectively obtaining a first propagation speed of the vibration wave propagating on each beam section and a second propagation speed from each beam section to the corresponding pile section according to the time and the layout position of the vibration wave reaching each detection point measured by the detection device.
Step S3: analyzing the first propagation speed and the second propagation speed according to a mathematical statistic method to obtain an abnormal speed critical value, and obtaining an abnormal first propagation speed or an abnormal second propagation speed according to the abnormal speed critical value to judge whether the connection state of the connecting parts of the pile beams is abnormal or not;
step S4: and carrying out stress detection on the structure of the pile beam connecting part with the abnormal connection state, and processing data obtained by the stress detection to obtain a pile beam numerical node model for evaluating the connection state of the pile beam connecting part.
According to the above, the corresponding detection points are determined on the beam section and the pile foundation section of each pile beam connecting part through the corresponding layout positions, the corresponding vibration points are determined according to the layout positions, and the vibration points and the detection points are positioned on the same reference section, and the section is parallel to the central axis of each pile foundation section, so that the vibration points can be ensured to be transmitted on the pile beam structure and in the same plane during transmission, the distance between the vibration points and the detection points is ensured to be the transmission distance actually passed by the vibration wave, the transmission speed of the vibration wave on each beam section and the transmission speed to the corresponding pile foundation section can be accurately obtained according to the time and the layout positions used when the vibration wave reaches the detection points, the obtained transmission speed can be subjected to numerical statistics by a mathematical statistics method to obtain an abnormal speed critical value, and whether the connection state of each pile beam connecting part is abnormal or not can be judged according to the obtained abnormal speed critical value, thereby the accessible carries out the atress to the structure of unusual pile beam connecting portion and detects, obtains the pile beam numerical value node model that corresponds to in the user according to each pile beam numerical value node model, realize the effective detection to the connection state of pile beam structure, and carry out accurate aassessment to the overall structure intensity and the performance of pile beam structure.
In addition, in the present embodiment, as a preferable mode, the vibration is generated by knocking instead of generating the vibration source by the machine, which not only facilitates the free selection of the position of the vibration point by the worker for the practical operation, but also saves the detection cost. The detection device mainly comprises a plurality of acceleration sensors arranged on corresponding detection points, test equipment in communication connection with the acceleration sensors, and a processing device in communication connection with the test equipment. In the present embodiment, the communication connection may be implemented by wire connection, wireless communication connection, and the like, and preferably, the wireless communication connection is implemented in the present embodiment, so as to facilitate the arrangement of the detection device on the pile beam structure and save the cost. The time for the vibration wave to reach the detection point can be obtained according to the moment when the acceleration sensor detects the vibration generated on the detection point. The testing device in the first detecting device may be a multifunctional Recorder such as TMR (Tokyo Multi-Recorder), and the processing device may be an intelligent terminal such as a desktop computer and a notebook computer for processing data output from the testing device.
Specifically, as shown in fig. 2, in the present embodiment, step S1 further includes the following steps:
each beam section is at least provided with two detection points (such as a detection point B and a detection point C shown in figure 2) which are respectively positioned at two sides of the corresponding pile foundation section, each pile foundation section is at least distributed with one detection point (such as a detection point D shown in figure 2), and the detection points on every two adjacent pile foundation sections are positioned at the same side.
Wherein, the detection points arranged on each beam section are positioned on the same straight line, and the straight line passes through the intersection part of each pile foundation section and the corresponding beam section. In the present embodiment, when the vibration point is actually provided, the vibration point may be located on the straight line or on the pile foundation section, but it is preferable that the vibration point is provided on the straight line in the present embodiment, and only this will be described as an example.
Therefore, by the arrangement mode, the path of the vibration wave propagating on the beam section is propagated along the straight line direction passing through each detection point, and further, the distance between every two adjacent detection points on each beam section and the distance between the detection point on each pile foundation section and the detection point on the corresponding beam section are the distance for the vibration wave to pass through, so that the first propagation speed and the second propagation speed can be measured only according to the distance between every two adjacent detection points on each beam section, the distance between the detection point on each pile foundation section and the detection point on the corresponding beam section and the measured time on each detection point, the detection of workers is facilitated, and the detection precision is improved.
In detail, in this embodiment, preferably, the distances between two adjacent detection points on each beam section are the same. The distances from the detection points on the pile foundation sections to the corresponding beam sections are the same.
Therefore, the arrangement mode not only facilitates the unified arrangement of the positions of the detection points by the staff, but also facilitates the calculation of the first propagation speed and the second propagation speed, so that the calculation efficiency is improved, and the time is saved.
Specifically, as shown in fig. 2, as a preferred layout, two detection points are provided on each beam section (e.g., detection point B and detection point C shown in fig. 2), one detection point is provided on each pile section (e.g., detection point D shown in fig. 2), and the detection point on each pile section and the corresponding vibration point are always located on the same side of the central axis of each pile section. So that the vibration point (such as vibration point G shown in FIG. 2) on each pile beam connecting part is positioned on the same side of the central axis of the pile section, and the distance between the detection points on the beam section and the pile section on the section, such as the distance (L) between detection point B and detection point D in FIG. 2b+Ld) The actual propagation path of the vibration point passing through the two detection points (detection point B and detection point D) is shown. Therefore, the calculation of the second propagation speed is facilitated, the diameter specification of the pile foundation section (the pile foundation section is a cylinder generally) does not need to be considered in the measuring process, the measuring error caused by different diameters of the pile foundation sections is avoided, and the calculating efficiency is improved.
In detail, as shown in fig. 2, let the arrival time of the vibration wave at point B be TbTime to C is TcTime to D point is Td. Wherein the distance (L) between the detection point B and the detection point Cb+LC) And the propagation velocity of the vibration wave in the node area is divided into the beam propagation velocity and the beam-to-pile propagation velocity, the propagation velocity of the vibration wave can be calculated according to the following formulas (1) and (2), wherein the first propagation velocity is assumed as VhThe second propagation velocity is VvThen, then
Therefore, as shown in fig. 3, step S3 further includes the following steps:
step S31: and counting all the obtained first propagation speeds and second propagation speeds, averaging the corresponding first propagation speeds and second propagation speeds on the pile beam connecting parts, and taking the average value as the propagation speed of the vibration wave on the pile beam connecting parts.
Step S32: and carrying out mathematical analysis on the propagation speed of the vibration wave on each pile beam connecting part to obtain an abnormal speed critical value, wherein the abnormal speed critical value comprises an abnormal critical maximum value and an abnormal critical minimum value.
Step S33: and comparing and judging the abnormal speed critical value with the propagation speed of the vibration wave on each pile beam connecting part.
Step S34: and if the propagation velocity value of the vibration wave on the corresponding pile beam connecting part is larger than the abnormal critical minimum value and smaller than the abnormal critical maximum value, judging that the connection state of the pile beam connecting part is normal.
Otherwise, judging that the connection state of the pile beam connecting part is abnormal.
Therefore, it is easy to find that the numerical values of the first propagation speed and the second propagation speed are analyzed in a mathematical statistics mode to obtain an abnormal speed critical value, and whether the connection state of the connection parts of the pile beams is normal or not is judged according to the abnormal speed critical value.
In detail, in the analysis process, according to actual needs, multiple sets of tests can be performed on each pile beam connecting part, and at least three sets of tests are performed, wherein preferably, the number of detection points in each set can be 3, the similar layout is adopted, and preferably, after the test is completed, the first propagation speed and the second propagation speed in each set on each pile beam connecting part are calculated, and when the range difference does not exceed 30% of the average value, the average value is taken as the propagation speed Vn of the vibration wave on each pile beam connecting part, wherein n represents the serial number of the measured pile beam connecting part. When the range exceeds 30% of the average value, the number of groups to be tested is increased, such as six groups, five groups and the like, the test is carried out again, the reason why the range is too large is analyzed, and the propagation speed is determined by combining the specific conditions of engineering.
Arranging the obtained corresponding propagation velocities on the connecting parts of the pile beams in sequence from large to small, namely V1≥V2≥…Vn≥Vn+1Not less than …. Remove the above V one by oneiAfter k minimum values and k' maximum values in the sequence, statistical calculations were performed according to the following equations (3) to (6).
V01＝Vm-λ*Sx(3)
V02＝Vm+λ*Sx(4)
Wherein i, k and k' are positive integers, VmIs a ViMean value of the sequence after removal of k minimum and k' maximum values, SxIs the variance, V01Is an abnormal critical minimum value, V02The abnormal critical maximum value is obtained, and the reference coefficient lambda value is obtained according to the following table 1.
TABLE 1 statistical number (n-k-k') and corresponding lambda value
As can be seen from table 1, the minimum data V in the sequence of k ═ 0, k ═ 1, k ═ 2, and k ═ 2 … … will be counted for the smallest number of sequences participating in the statisticsn-kAnd an abnormal critical minimum value V01Making a comparison when Vn-k≤V01In time, minimum data V is culledn-k。
Maximum data V(k'+1)And an abnormal critical maximum value V02Making a comparison when Vk'+1≥V02Time-culling maximum data V(k'+1)。
Removing one data each time, repeating the calculation steps (3) to (6) for the sequence formed by the residual data until Vn-k＞V01、Vk'+1＜V02. For all satisfy Vi≤V01、Vi≥V02The test data of (2) are all abnormal data.
In addition, it should be noted that the above-mentioned λ value can be obtained by referring to item 10.5.3 of JGJ 106-.
As shown in fig. 4, step S4 further includes the steps of:
step S41: and determining test areas on the beam section and the pile foundation section of the abnormal pile-beam connecting part, setting corresponding stress detection points on the test areas, and detecting the stress detection points through a detection device.
Step S42: and processing the stress change data of the detection device at the detected stress detection point according to a corresponding material mechanics formula, and respectively calculating the beam distribution coefficient and the pile foundation distribution coefficient through a bending moment distribution coefficient calculation formula and an axial force distribution coefficient calculation formula.
Step S43: and drawing a beam distribution coefficient time-course curve and a pile foundation distribution coefficient time-course curve according to the beam distribution coefficient, the pile foundation distribution coefficient and the corresponding test time.
Step S44: and obtaining corresponding representative values of the beam distribution coefficients and the pile foundation distribution coefficients according to the time-course curve of the beam distribution coefficients and the time-course curve of the pile foundation distribution coefficients.
Step S45: and taking the beam distribution coefficient representative value and the pile foundation distribution coefficient representative value as node numerical values to adjust a pile beam numerical node model which is simulated and established according to the measured data on the abnormal pile beam connecting part, and evaluating the connecting state of the abnormal pile beam connecting part according to the adjusted pile beam numerical node model.
Therefore, the cross beam distribution coefficient representative value and the pile foundation distribution coefficient representative value are obtained through the obtained cross beam distribution coefficient time-course curve and the pile foundation distribution coefficient time-course curve, and the cross beam distribution coefficient representative value and the pile foundation distribution coefficient representative value are used as node numerical values to adjust the pile beam numerical node model, so that a user can better evaluate the connection state of the abnormal pile beam connecting part by adjusting the pile beam numerical node model, the accuracy of an evaluation result is improved, and a worker is prompted to process the abnormal pile beam connecting part according to the evaluation result.
Wherein, the following substeps are also present in the step of step S41: as shown in FIG. 5, two beam testing sections (beam testing section A shown in FIG. 5) are selected on the beam section of the abnormal pile-beam connecting part, wherein the two beam testing sections are opposite and respectively positioned at two sides of the pile section0And beam test section B0) And the plane of the cross beam testing section is vertical to the length direction of the cross beam section.
Wherein, symmetrical stress detection points are arranged on two opposite sides of the cross beam testing section and are distributed at equal intervals, as shown in fig. 5, 6 and 7, the cross beam testing section A0Six stress detection points A are arranged on the device1、A2、A3、A4、A5、A6And beam test section B0Stress detection point B shown1、B2、B3、B4、B5、B6) Wherein a cross section A is tested on the cross beam0Upper, stress detection point A1、A3、A5On the same side of the beam section, and A2、A4、A6On the other side of the beam section, and A1And A2Symmetrically arranged, A3And A4Symmetrically arranged, A5And A6Symmetrically arranged, and the distance between two adjacent stress detection points on the same side is d, and the neutral axis of the beam section and the stress detection point A are assumed1、A2Is L, and a cross-beam test section B0In this way, the same layout is adopted.
Similarly, one pile base section is also selectedThe pile foundation testing section is preferably selected, and the plane of the pile foundation testing section is perpendicular to the length direction of the pile foundation section, as shown in fig. 2 and 5, the pile foundation section in the embodiment is a circular pile, so that the selected pile foundation testing section C is similar to a circumferential surface0Is provided with C1、C2、C3、C4Four symmetrical stress detection points which are arranged around the pile circumference of the pile foundation section at equal intervals, wherein the stress detection points C1And C4Symmetrically arranged, stress detection points C2And C3The pile foundation is symmetrically arranged, detection points are arranged on the periphery of the pile foundation at intervals of one fourth of the length of the circumference of the pile foundation, and the distance between the neutral axis of the pile foundation and the left end of the pile foundation is assumed to be L.
Thus, when the beam is acted by the dynamic force, the dynamic strain of each stress detection point is measured to obtain the strain time course curve of each stress detection point, and the strain time course curve is calculated according to the formulas (7) to (12) to obtain A0、B0、C0Bending moment time-course curves and axial force time-course curves of the three test sections.
To A0、B0In the section, assuming that the upper part of the beam is pressed and the lower part is pulled, the dynamic strain generated by the stress detection points arranged on the test section of each beam meets the conditions of the following material mechanics formulas (7) to (10):
wherein, in the above formula，ε12、ε34、ε56Respectively as stress detection points A1Stress detection point A2Mean value therebetween, stress detection point A3Stress detection point A4Mean value therebetween, stress detection point A5Stress detection point A6Mean value therebetween, or respectively, stress detection point B1And stress detection point B2Mean value therebetween, stress detection point B3And stress detection point B4Mean value therebetween, stress detection point B5And stress detection point B6Average value in between;
EIL-beam bending stiffness;
a, the area of a cross beam test section;
e-modulus of elasticity of the beam;
IL-the moment of inertia of the beam test section to the beam neutral axis;
m is bending moment generated on the cross beam test section;
n-beam tests the axial force on the section.
Similarly, according to the calculation mode, the pile foundation test section C0The conditions of the material mechanics equations (11) and (12) are also satisfied:
from this, the pile foundation test section C can be obtained0The bending moment and the axial force are as follows:
wherein, in the above formula, ∈1、ε4、ε23Respectively as stress detection points C1Stress detection point C4Strain value of (2), stress detection point C2And stress detection point C3Average value of strain of (a).
E′IL' -pile foundation bending stiffness;
a' — area of pile foundation test section;
r is the radius of the pile foundation test section;
e' -the modulus of elasticity of the pile foundation test section;
IL' -moment of inertia of the pile foundation test section to the beam neutral axis;
m' -bending moment generated on the test section of the pile foundation;
n' -axial force borne on a pile foundation test section.
Therefore, by the distribution and measurement mode, the layout and the operation of workers are facilitated, the stress generated when the pile foundation test section and the beam test section are stressed can be accurately measured, and the stress can be accurately calculated according to the corresponding formula, so that the precision and the test efficiency of the measurement result are improved.
In addition, in order to accurately evaluate the connection state of the abnormal pile beam connection portion, there are the following substeps in the step of step S42:
and respectively calculating the bending moment and the axial force on the cross beam test section and the pile foundation test section at the corresponding moment through a bending moment calculation formula and an axial force calculation formula, such as the formula (10) and the formula (12).
And respectively calculating the beam distribution coefficient and the pile foundation distribution coefficient according to the following bending moment distribution coefficient formula and axial force distribution coefficient formula such as the following formulas (13) to (16). The beam distribution coefficient comprises a beam bending moment distribution coefficient and a beam axial force distribution coefficient, and the pile foundation distribution coefficient comprises a pile foundation bending moment distribution coefficient and a pile foundation beam axial force distribution coefficient.
Wherein in the above formula, MA、MB、MCRespectively is A0、B0、C0Bending moment value at the section;
FA、FB、FCrespectively the crossbeam test section A0Crossbeam test section B0Pile foundation beam test section C0The value of the axial force;
KAB-distributing the coefficients for the beam bending moments;
K′AB-distributing coefficients for beam axial forces;
KAc-distributing coefficients for pile foundation bending moments;
K′Ac-distributing coefficients for pile foundation axial forces.
From the above, it can be seen that the beam bending moment distribution coefficient K is obtainedABAnd beam axial force distribution coefficient K'ABPile foundation bending moment distribution coefficient KAcAnd pile foundation axial force distribution coefficient K'AcAnd drawing a cross beam distribution coefficient time course curve (namely a cross beam bending moment distribution coefficient time course curve and a cross beam axial force distribution coefficient time course curve) and a pile foundation distribution coefficient time course curve (namely a pile foundation bending moment distribution coefficient time course curve and a pile foundation axial force distribution coefficient time course curve) through related processing devices by taking the time as an abscissa and the corresponding distribution coefficient as an ordinate.
After the four types of distribution coefficient curves are obtained, the stationary sections on each distribution coefficient curve are determined, the mean value of the distribution coefficients corresponding to the stationary sections is taken as a representative value of the beam distribution coefficient (namely, a representative value of the beam bending moment distribution coefficient and a representative value of the beam axial force distribution coefficient), a representative value of the pile distribution coefficient (namely, a representative value of the pile bending moment distribution coefficient and a representative value of the pile axial force distribution coefficient), a pile node numerical model is adjusted according to the representative value of each distribution coefficient on the abnormal pile-beam connecting part (established according to data and parameters measured by the abnormal pile-beam connecting part), each representative value of the distribution coefficient is taken as a node rigidity value of the abnormal pile-beam connecting part, the numerical model is adjusted, and the connecting state of the abnormal pile-beam connecting part is evaluated according to the numerical model.
In addition, it is worth mentioning that the detection device further comprises strain sensors disposed on corresponding strain detection points, and each strain sensor is in communication connection with the testing equipment in the detection device.
The second embodiment of the present invention provides a method for dynamically detecting and evaluating the connection state of a node of a pile beam structure, and is a further improvement of the first embodiment, and the improvement is that in this embodiment, after step S3, the method further includes the following steps: generating a vibration wave propagated in the pile beam structure through the vibration point again, obtaining a retested first propagation speed and a retested second propagation speed according to data measured by the detection device on the abnormal pile beam connecting part, and taking the average value of the first propagation speed and the second propagation speed as the retested propagation speed of the vibration wave on the pile beam connecting part;
and comparing the propagation speed of the retest with the critical value of the abnormal speed to judge whether the pile-beam connecting part needs to be subjected to stress detection.
In particular, as a preferred mode, if the value of the propagation velocity measured in duplicate is between the above-mentioned abnormal critical minimum values V01And an abnormal critical maximum value V02And if not, carrying out stress detection on the structure of the pile-beam connecting part.
If the above-mentioned retest steps are repeated, the propagation velocity value of the second retest is still in the abnormal critical minimum value V01And an abnormal critical maximum value V02And if not, the structure of the pile beam connecting part is subjected to stress detection.
According to the above, by adopting the method, the phenomenon that measurement errors occur due to external factors such as abnormal assembly of the detection device and the like, so that unnecessary time waste is caused, can be avoided.
The above embodiments are merely to illustrate the technical solution of the present invention, not to limit the same, and the present invention has been described in detail with reference to the preferred embodiments. It will be understood by those skilled in the art that various modifications and equivalent arrangements may be made without departing from the spirit and scope of the present invention and it is intended to cover the appended claims.
Claims (9)
1. A method for dynamically detecting and evaluating the connection state of a pile-beam structure node, wherein the pile-beam structure comprises N pile-beam connecting parts consisting of pile foundation sections and beam sections, wherein N is a positive integer greater than 1, and the method comprises the following steps:
step S1: determining the layout positions of M detection points on each pile beam connecting part, and arranging a detection device for monitoring each detection point on the pile beam structure, wherein M is a positive integer greater than 1; selecting corresponding vibration points on the pile beam structure according to the layout positions, and ensuring that the vibration points and the detection points are located on the same reference section, and the reference section is parallel to the central axis of each pile foundation section and penetrates through each pile foundation section so as to generate vibration waves transmitted in the pile beam structure through the vibration points;
step S2: respectively obtaining a first propagation speed of the vibration wave propagating on each beam section and a second propagation speed of the vibration wave from each beam section to the corresponding pile section according to the time for the vibration wave to reach each detection point and the layout position measured by the detection device;
step S3: analyzing the first propagation speed and the second propagation speed according to a mathematical statistical method to obtain an abnormal speed critical value, and judging whether the connection state of each pile beam connecting part is abnormal or not according to the abnormal speed critical value;
step S4: carrying out stress detection on the structure of the pile beam connecting part with the abnormal connection state, and processing data obtained by the stress detection to obtain a pile beam numerical node model for evaluating the connection state of the pile beam connecting part;
wherein, the step S4 further includes the following steps:
step S41: determining test areas on the beam section and the pile foundation section of the abnormal pile-beam connecting part, setting corresponding stress detection points on the test areas, and detecting the stress detection points through the detection device;
step S42: processing the stress change data of the detection device on the detected stress detection point according to a corresponding material mechanics formula, and respectively calculating a beam distribution coefficient and a pile foundation distribution coefficient through a bending moment distribution coefficient calculation formula and an axial force distribution coefficient calculation formula;
step S43: drawing a beam distribution coefficient time-course curve and a pile foundation distribution coefficient time-course curve according to the beam distribution coefficient, the pile foundation distribution coefficient and corresponding test time;
step S44: obtaining corresponding beam distribution coefficient representative values and pile foundation distribution coefficient representative values according to the beam distribution coefficient time-course curve and the pile foundation distribution coefficient time-course curve;
step S45: and taking the beam distribution coefficient representative value and the pile foundation distribution coefficient representative value as node numerical values to adjust a pile beam numerical node model which is simulated and established according to the measured data on the abnormal pile beam connecting part, and evaluating the connecting state of the corresponding pile beam connecting part according to the adjusted pile beam numerical node model.
2. The method for dynamically detecting and evaluating the connection state of a node of a pile-beam structure according to claim 1, wherein the step S1 further comprises the steps of:
each beam section is provided with at least two detection points which are respectively positioned at two sides of the corresponding pile foundation section, each pile foundation section is provided with at least one detection point, and the detection points on every two adjacent pile foundation sections are positioned at the same side;
the detection points arranged on the beam sections are positioned on the same straight line, and the straight line penetrates through the intersection part of each pile foundation section and the corresponding beam section;
the vibration point is located on the straight line or the pile foundation section.
3. The method for dynamically detecting and evaluating the connection state of a node of a pile-beam structure according to claim 1, wherein the step S3 further comprises the steps of:
step S31: counting all the obtained first propagation speeds and second propagation speeds, averaging the corresponding first propagation speeds and second propagation speeds on the pile beam connecting parts, and taking the average value as the propagation speed of the vibration wave on the pile beam connecting part;
step S32: carrying out mathematical analysis on the propagation speed of the vibration wave on each pile beam connecting part to obtain an abnormal speed critical value, wherein the abnormal speed critical value comprises an abnormal critical maximum value and an abnormal critical minimum value;
step S33: comparing and judging the abnormal speed critical value with the propagation speed of the vibration wave on each pile beam connecting part;
step S34: if the propagation velocity value of the vibration wave on the corresponding pile beam connecting part is larger than the abnormal critical minimum value and smaller than the abnormal critical maximum value, judging that the connection state of the pile beam connecting part is normal;
otherwise, judging that the connection state of the pile beam connecting part is abnormal.
4. The method for dynamically detecting and evaluating the connection state of a node of a pile beam structure according to claim 1, wherein the following substeps are further present in the step of step S41:
selecting two opposite cross beam test sections which are respectively positioned at two sides of a pile foundation section on a cross beam section of an abnormal pile-beam connecting part, wherein the plane of the cross beam test section is vertical to the length direction of the cross beam section, and selecting a pile foundation test section on the pile foundation section, and the plane of the pile foundation test section is vertical to the length direction of a pile foundation section;
symmetrical stress detection points are arranged on two opposite sides of the cross beam testing section and are distributed at equal intervals; the pile foundation test section is provided with symmetrical stress detection points which are distributed in an encircling manner at equal intervals.
5. The method for dynamically detecting and evaluating the connection state of the nodes of the pile-beam structure according to claim 1, wherein the distances between two adjacent detection points on each beam section are the same;
the distances from the detection points on the pile foundation sections to the corresponding beam sections are the same.
6. The method for dynamically detecting and evaluating the connection state of the nodes of the pile-beam structure according to claim 1, wherein the vibration points are excited by means of knocking.
7. A method for dynamically detecting and evaluating the connection state of a node of a pile beam structure according to claim 1, wherein the following substeps are further present in the step S41: and generating vibration waves through the vibration points again, and respectively obtaining a corresponding first propagation speed and a corresponding second propagation speed according to the time and the layout position of the vibration waves which are measured by the detection device when the vibration waves reach each detection point on the abnormal pile beam connecting part.
8. The method for dynamically detecting and evaluating the connection state of a node of a pile-beam structure according to claim 1, wherein after the step S3, the method further comprises the following steps:
generating a vibration wave propagated in the pile beam structure through the vibration point again, obtaining a retested first propagation speed and a retested second propagation speed according to data measured by the detection device on the abnormal pile beam connecting part, and taking the average value of the first propagation speed and the second propagation speed as the retested propagation speed of the vibration wave on the pile beam connecting part;
and comparing the propagation speed of the retest with the critical value of the abnormal speed to judge whether the pile-beam connecting part needs to be subjected to stress detection.
9. The method for dynamically detecting and evaluating the connection state of a node of a pile beam structure according to claim 1, wherein in the step S1, the method further comprises the following substeps:
the method comprises the following steps of dividing M detection points on each pile beam connecting part into at least three groups, wherein the number of the detection points in each group is at least three, and M is larger than 9.
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