CN-121994433-A - Suspension bridge suspender damage identification and positioning method based on main cable morphological variation

CN121994433ACN 121994433 ACN121994433 ACN 121994433ACN-121994433-A

Abstract

The invention relates to the technical field of suspension bridge suspenders and discloses a suspension bridge suspender damage identification and positioning method based on main cable morphological variation, comprising the following steps of S1, obtaining the position of a connecting line central point between main cable intersection points at two sides; S2, obtaining relative displacement of the intersection points of the main cables of the suspension bridge, S3, repeating S1-S2 to obtain relative displacement of the intersection points of the main cables of the suspension bridge, obtaining a relative displacement change diagram of the intersection points of the main cables, wherein the abscissa is the number of the suspension bridge, the ordinate is the relative displacement, S4, when the intersection points of the main cables are in an M shape, the damage of the suspension rod is vertical damage, the corresponding abscissa at the inward bending position of the M-shaped line is the corresponding damaged suspension rod, when the intersection points of the main cables are in a W shape, the damage of the suspension rod is transverse damage, and the corresponding abscissa at the outward bending position of the W-shaped line is the corresponding damaged suspension rod. The invention can know the condition of the suspender in time and prevent and maintain the suspension bridge.

Inventors

ZHOU YIN
WEN XIN
CHEN XUAN
Huang Longhang
ZHANG HONG
WANG YUE
XIE HOULI
ZHOU JIANTING
LIAO YUAN
TANG QIZHI
YANG JIPENG
YANG CHANGXI

Assignees

重庆交通大学
湖北省交通规划设计院股份有限公司
重庆市建设信息中心
重庆市九龙坡区建设事务中心

Dates

Publication Date: 20260508
Application Date: 20260209

Claims (8)

1. The suspension bridge suspender damage identification and positioning method based on the main cable morphological variation is characterized by comprising the following steps of: s1, obtaining the connection center point position between main cable intersection points on two sides of a suspender through main cable intersection points on two sides of the suspender of a suspension bridge; s2, crossing point of main cable of the suspender through suspension bridge The difference between the actual position of the time point and the position of the central point obtains the initial displacement of the intersection point of the main cable of the suspension rod, and the intersection point of the main cable of the suspension rod passes through the suspension bridge Obtaining the deformation displacement of the intersection point of the main cable of the suspension rod by the difference between the actual position of the time point and the position height of the central point, wherein the difference between the deformation displacement and the initial displacement is the relative displacement; S3, repeating the steps S1-S2 to obtain relative displacement of corresponding main cable intersection points of all suspension rods of the suspension bridge, and obtaining a main cable intersection point relative displacement change diagram with the horizontal coordinates as the suspension rod numbers and the vertical coordinates as the relative displacement according to the relative displacement of all main cable intersection points of the suspension bridge; S4, when the line in the main cable intersection point relative displacement change diagram is M-shaped, the damage of the suspender is vertical damage, and the corresponding abscissa at the inward bending position in the M-shaped line is the suspender with corresponding damage; When the intersection point of the main cable is in a W shape relative to the line in the displacement change diagram, the damage of the suspender is the transverse damage, and the corresponding abscissa at the outwards bent position in the W-shaped line is the suspender with the corresponding damage.
2. The method for identifying and positioning the suspension bridge boom damage based on the morphological variation of the main cable according to claim 1, wherein when the line in the main cable intersection point relative displacement variation graph is M-shaped, the vertical damage comprises boom broken wire or anchor loosening.
3. The method for identifying and positioning the suspension bridge boom damage based on the morphological variation of the main cable according to claim 1, wherein the line in the main cable intersection relative displacement variation graph is W-shaped, and the lateral damage comprises cable clamp slippage.
4. The method for identifying and positioning the suspension bridge suspender damage based on the main cable morphological variation as claimed in claim 2, wherein in S4, if the line in the main cable intersection point relative displacement variation graph only presents an M shape, the suspender damage is single suspender broken wire or single suspender anchor loosening; if the line in the main cable intersection point relative displacement change graph presents a plurality of M shapes, the suspender damage is that a plurality of suspender broken wires or a plurality of suspender anchors are loosened.
5. The method for identifying and positioning the suspension bridge suspender damage based on the main cable morphological variation as set forth in claim 3, wherein in S4, if the line in the main cable intersection point relative displacement variation graph only presents a W shape, the suspender damage is single cable clamp slippage; If the intersection point of the main cable is relatively displaced, the line in the change graph shows a plurality of W shapes, and the suspender is damaged to slide as a plurality of cable clamps.
6. The method for identifying and locating damage to a suspension bridge boom based on morphological variation of a main cable according to claim 1, wherein when a line in a graph of the relative displacement variation of the intersection points of main cables is M-shaped, if the relative displacement of the intersection point of main cable corresponding to one boom is smaller than a preset threshold value, respectively, the boom is the damaged boom, namely the M-shaped inward bending point, as shown in formulas (1) and (2), (1), (2), In the formulas (1) and (2), Is the first The corresponding main cable intersection point of the boom is relatively displaced, Is the first The corresponding main cable intersection point of the boom is relatively displaced, Is the first The corresponding main cable intersection point of the boom is relatively displaced, Is a preset threshold.
7. The method for identifying and locating damage to a suspension bridge boom based on morphological variation of a main cable according to claim 1, wherein when a line in a graph of the relative displacement variation of the intersection points of main cables is W-shaped, if the relative displacement of the intersection point of main cable corresponding to one boom is greater than a preset threshold value, respectively, the boom is the damaged boom, namely the W-shaped outward bending point, as shown in formulas (3) and (4), (3), (4), In the formulas (3) and (4), Is the first The corresponding main cable intersection point of the boom is relatively displaced, Is the first The corresponding main cable intersection point of the boom is relatively displaced, Is the first The corresponding main cable intersection point of the boom is relatively displaced, Is a preset threshold.
8. The method for identifying and positioning the suspension bridge boom damage based on the morphological variation of the main cable according to claim 1, wherein in S4, one half of the initial displacement of the intersection point of the main cable of the boom is set as a serious damage threshold, if the absolute value of the relative displacement of the intersection point of the main cable corresponding to the inward bending point in the M shape is smaller than a preset serious damage threshold, the boom is partially broken, and if the absolute value of the relative displacement of the intersection point of the main cable corresponding to the inward bending point in the M shape is larger than the preset serious damage threshold, the anchor is loosened or the boom is completely broken.

Description

Suspension bridge suspender damage identification and positioning method based on main cable morphological variation Technical Field The invention relates to the technical field of suspension bridge suspenders, in particular to a suspension bridge suspender damage identification and positioning method based on main cable morphological variation. Background The suspender is used as a key component for connecting a main cable and a main girder of the suspension bridge, the safety performance of the suspender is critical to the whole bridge, the suspension bridge at home and abroad is in accident caused by the suspender problem, most of the suspender is caused by suspension rod wire breakage, the loosening of an anchor of the suspender (the loosening of the anchor caused by the reduction of clamping force due to corrosion, loosening of clamping pieces and the like of the anchor rod) and the slipping of a cable clamp (the suspender is connected with the main cable through the cable clamp, and the cable clamp is caused to slip when the corrosion and loosening of a cable clamp bolt occur). The damage of the suspension rod can cause obvious change of the suspension rod force, reduce the safety reserve of the suspension rod and the main beam, and even greatly influence the normal use and the safety performance of the suspension bridge. The boom damage identification and positioning can timely prevent catastrophic accidents, prolong the service life of the bridge and reduce the cost of the whole life cycle, for example, through accurate positioning damage, targeted repair measures (such as boom replacement and anti-corrosion treatment) are adopted, the cost of replacing a single boom only accounts for one thousandth of the reconstruction cost of the whole bridge, and the whole life of the bridge can be remarkably prolonged. The damage identification and positioning of the suspension bridge boom is a multi-technology fusion comprehensive diagnosis process. In the prior art, the frequency of the suspender is measured by a vibration analysis method to reversely calculate the tension of the suspender, so that the quick general investigation and the primary positioning of the internal damage such as steel wire fracture, corrosion and the like are realized. Secondly, the unmanned aerial vehicle is used for carrying a high-definition camera for visual inspection, and the artificial intelligent image recognition technology is combined to accurately recognize and position the defects of cracks, rust and the like on the surface of the boom. However, vibration analysis is easily affected by environmental factors (such as temperature change), so that the frequency measurement precision is reduced, particularly in the early stage of the damage of a suspension rod, the rigidity and the quality change are tiny, the frequency change is not obvious, the accurate identification of early damage is difficult to realize, secondly, visual inspection relies on manual interpretation or AI image identification, the non-surface visible damage such as release in the anchor of the suspension rod and sliding of the hidden part of a cable clamp cannot be effectively detected, the inspection of an unmanned aerial vehicle is greatly limited by weather conditions, inspection dead areas exist, and in addition, the existing method is mostly specific to single damage types (such as only wire breakage identification or cable clamp sliding detection), and the comprehensive discrimination capability of different damage modes (such as wire breakage, anchor release and transverse damage such as cable clamp sliding) is lacked, so that the overall health state of the suspension rod is difficult to be systematically estimated, and the omission or misjudgment may be caused. Disclosure of Invention In order to overcome the defects of the prior art, the invention aims to provide the suspension bridge suspender damage identification and positioning method based on the main cable morphological variation, which avoids the influence of environmental factors, and can timely know the condition of the suspension bridge suspender, thereby judging the safety performance of the suspension bridge, preventing and maintaining the suspension bridge, prolonging the service life of the bridge and reducing the life cycle cost. The technical scheme adopted by the invention is as follows, the suspension bridge suspender damage identification and positioning method based on the main cable morphological variation comprises the following steps: s1, obtaining the connection center point position between main cable intersection points on two sides of a suspender through main cable intersection points on two sides of the suspender of a suspension bridge; s2, crossing point of main cable of the suspender through suspension bridge The difference between the actual position of the time point and the position of the central point obtains the initial displacement of the intersection point of