CN-121978317-A - Method and system for detecting protective performance of concrete guardrail of expressway

CN121978317ACN 121978317 ACN121978317 ACN 121978317ACN-121978317-A

Abstract

The invention discloses a method and a system for detecting the protective performance of a concrete guardrail of an expressway, and relates to the technical field of detection of the protective performance of the concrete guardrail, comprising the steps of constructing a reference plane and obtaining the shape of a seam edge space; the method comprises the steps of combining vehicle and road parameters, calculating a small incidence deflection angle, a normal distance and a lateral clearance of the vehicle, establishing an association relation between a vehicle running state and a guardrail local geometry, calculating an equivalent invasion amount of surface contact and edge contact, combining a side-to-side relative stiffness ratio obtained by vibration measuring points, determining a critical switching state, obtaining a critical switching accessibility index based on vehicle running statistics, forming accessibility density and geometric contribution, and generating a protective performance detection result. The invention can accurately identify the high-risk sections of the expansion joints adjacent to the concrete guardrail, and improves the accuracy of the protection capability assessment.

Inventors

DING QING
LI JIBO
WEI WEI
ZOU XINYAN
DAI XIPU

Assignees

江西交投海通公路养护有限公司

Dates

Publication Date: 20260505
Application Date: 20260403

Claims (8)

1. The method for detecting the protective performance of the concrete guardrail of the expressway is characterized by comprising the following steps of: S1, performing three-dimensional measurement on a concrete guardrail surface and an expansion joint, establishing a reference plane based on a three-dimensional measurement point set, and calculating a normal slight dislocation and a tangential step from a seam edge of the expansion joint to the reference plane; S2, calculating an incidence small deflection angle of the vehicle relative to a road and a normal geometric distance from the front wheel of the vehicle to a reference plane according to the course angle of the vehicle, the geometric center of the front wheel and the road direction; S3, determining a surface contact equivalent intrusion quantity according to the normal geometric distance of the front wheel of the vehicle, and determining a side contact equivalent intrusion quantity by combining a normal micro-error platform, a tangential step and an incidence small deflection angle; S4, arranging vibration measuring points at the positions of the seam edge of the expansion joint and the rail surface of the concrete guardrail, and obtaining the relative rigidity ratio of the edge surface based on vibration response; S5, generating a critical switching reachability index based on the edge-to-face relative stiffness ratio, the edge contact equivalent intrusion amount and the face contact equivalent intrusion amount; And S6, generating a protection detection result of the concrete guardrail according to the critical switching accessibility index.
2. The method for detecting the protective performance of the concrete guardrail of the expressway according to claim 1, wherein the three-dimensional measurement is performed on the surface of the concrete guardrail and the expansion joint, a reference plane is established based on a three-dimensional measurement point set, and a normal slight dislocation and a tangential step from the seam edge of the expansion joint to the reference plane are calculated, and the method comprises the following steps: Establishing a three-dimensional rectangular coordinate system in a concrete guardrail connecting area adjacent to the expansion joint, and defining arc length coordinates on a central line of the expansion joint; a temperature sensor is arranged in a concrete guardrail connecting area adjacent to the expansion joint, and temperature data are obtained; Scanning the edge of the concrete guardrail surface and the expansion joint through three-dimensional measuring equipment under each temperature data to obtain a three-dimensional measuring point set of a guardrail surface area and a three-dimensional measuring point set of the edge area; according to the space trend of the expansion joint, establishing a corresponding relation between the three-dimensional measuring points of the joint edge and the arc length coordinates to obtain the joint edge space position data; Performing plane fitting on the three-dimensional measurement point set of the fence surface area to obtain a reference plane of the concrete guardrail fence surface; Determining a normal direction perpendicular to a concrete guardrail surface in a reference plane; Determining a tangential direction which is positioned in a datum plane of a concrete guardrail fence surface and extends longitudinally along a road in the datum plane; Orthographic projection is carried out on the spatial position of the seam edge based on the reference plane, so that the spatial offset of the seam edge relative to the reference plane is obtained; Defining a component of the spatial offset in the normal direction as a normal slight stagger of the seam edge relative to the fence face; The component of the spatial offset in the tangential direction is defined as the tangential step of the seam edge relative to the rail surface.
3. The method for detecting the protective performance of the concrete guardrail of the expressway according to claim 2, wherein calculating the incidence small deflection angle of the vehicle relative to the road and the normal geometric distance of the front wheel of the vehicle to the reference plane according to the course angle of the vehicle, the geometric center of the front wheel and the road direction comprises: Acquiring the course angle of a vehicle and the space position data of the geometric center of the front wheel of the vehicle in a three-dimensional rectangular coordinate system; Acquiring spatial position data of a highway road center line in a three-dimensional rectangular coordinate system, and carrying out parameterization treatment on the road center line according to arc length coordinates to obtain spatial coordinate data of the road center line at different arc length positions and corresponding road direction angle data; determining a road arc length coordinate of the vehicle based on a minimum distance between the spatial position data of the geometric center of the front wheel of the vehicle and the spatial position data of the center line of the road; Acquiring road direction angle data corresponding to the road arc length coordinates of the vehicle, and taking the difference value between the course angle data of the vehicle and the road direction angle data as the incidence small deflection angle of the vehicle relative to the road direction; Calculating the normal geometric distance of the geometric center of the front wheel of the vehicle relative to the reference plane of the concrete guardrail fence surface based on the spatial position relation between the reference plane of the concrete guardrail fence surface and the geometric center of the front wheel of the vehicle; Calculating a lateral geometric offset distance of the vehicle relative to the road centerline in a lateral direction of the road based on the spatial position data of the road centerline and the spatial position data of the geometric center of the front wheel of the vehicle; the lateral geometric offset distance is taken as the lateral clearance between the vehicle and the guardrail.
4. The method for detecting the protective performance of the concrete guardrail of the expressway according to claim 3, wherein the method for determining the surface contact equivalent intrusion amount according to the normal geometric distance of the front wheel of the vehicle and determining the side contact equivalent intrusion amount by combining a normal micro-dislocation, a tangential step and an incidence small deflection angle comprises the following steps: If the normal geometric distance of the front wheel of the vehicle is a negative value, taking the absolute value of the normal geometric distance value as the surface contact equivalent intrusion quantity, otherwise, taking the surface contact equivalent intrusion quantity to be zero; Obtaining the geometric correction of the normal micro-dislocation along the incident direction according to the product of the cosine value of the normal micro-dislocation and the incident small deflection angle; Obtaining the geometric correction of the tangential step along the incident direction according to the product of the tangential step and the sine value of the incident small deflection angle; and adding the surface contact equivalent invasion quantity with the geometric correction quantity of the normal micro-error platform along the incidence direction and the geometric correction quantity of the tangential step difference along the incidence direction to obtain the side contact equivalent invasion quantity.
5. The method for detecting the protective performance of the concrete guardrail of the expressway according to claim 4, wherein vibration measuring points are arranged at the positions of the seam edge of the expansion joint and the surface of the concrete guardrail, the edge-to-surface relative stiffness ratio is obtained based on vibration response, and the method comprises the following steps: a first vibration measuring point is arranged at the seam edge position of the expansion joint, and a second vibration measuring point is arranged at the position of the fence surface of the concrete guardrail; Collecting vibration response data of the first vibration measuring point and the second vibration measuring point under different frequencies, and constructing an edge frequency response function of the seam edge position and a fence frequency response function of the fence position; And determining a common resonance frequency in the amplitude spectrums of the edge frequency response function and the hurdle surface frequency response function, and calculating the ratio of the amplitude of the edge frequency response function to the amplitude of the hurdle surface frequency response function at the resonance frequency to obtain the relative stiffness ratio of the side surface.
6. The method for detecting the protective performance of the concrete guardrail of the highway according to claim 5, wherein the step of generating the critical switching reachability index based on the side-to-side relative stiffness ratio, the side-contact equivalent intrusion amount and the side-contact equivalent intrusion amount comprises the steps of: multiplying the side-to-side relative stiffness ratio by the side contact equivalent intrusion amount, and subtracting the side contact equivalent intrusion amount to obtain a critical switching value; when the critical switching value is not less than zero, judging that the critical state is reached; Counting the incidence small deflection angle of the vehicle and the lateral clearance between the vehicle and the guardrail, and constructing the joint distribution of the incidence states of the vehicle and the guardrail surface; and integrating the joint distribution of the vehicles meeting the critical state and the incidence state of the fence surface to obtain the critical switching reachability index.
7. The method for detecting the protective performance of the concrete guardrail of the expressway according to claim 1, wherein the method for generating the protective detection result of the concrete guardrail according to the critical switch accessibility index comprises the following steps: discrete division is carried out on the arc length of the expansion joint to obtain an arc length discrete position set; in a preset detection time interval, time averaging is carried out on the critical switching reachability indexes corresponding to each arc length discrete position, and reachability density data corresponding to arc length coordinate positions is obtained; in a preset detection time interval, carrying out statistical average operation on products of normal micro-dislocation and incidence small deflection angle cosine values aiming at each arc length discrete position to obtain geometric contribution of the normal micro-dislocation; in a preset detection time interval, carrying out statistical average operation on products of tangential step differences and incidence small-deflection-angle sine values aiming at each arc length discrete position to obtain tangential step difference geometric contribution; And combining the reachability density value, the normal micro-staggered platform geometric contribution and the tangential step geometric contribution corresponding to each arc length discrete position to generate a protection detection result of the arc length section of the concrete guardrail.
8. A highway concrete guardrail protective performance detection system, the system comprising: the parameter reconstruction module is used for carrying out three-dimensional measurement on the concrete guardrail surface and the expansion joint, establishing a reference plane based on the three-dimensional measurement point set, and calculating a normal slight dislocation and a tangential step difference from the seam edge of the expansion joint to the reference plane; The incidence attitude module is used for calculating an incidence small deflection angle of the vehicle relative to the road and a normal geometric distance from the front wheel of the vehicle to the reference plane according to the course angle of the vehicle, the geometric center of the front wheel and the road direction; the equivalent intrusion module is used for determining the surface contact equivalent intrusion quantity according to the normal geometric distance of the front wheel of the vehicle and determining the side contact equivalent intrusion quantity by combining a normal micro-error platform, a tangential step and an incidence small deflection angle; The relative rigidity ratio module is used for distributing vibration measuring points at the positions of the seam edge of the expansion joint and the rail surface of the concrete guardrail and obtaining the relative rigidity ratio of the edge surface based on vibration response; The accessibility index module is used for generating a critical switching accessibility index based on the edge-to-face relative stiffness ratio, the edge contact equivalent intrusion quantity and the face contact equivalent intrusion quantity; And the performance detection module is used for generating a protection detection result of the concrete guardrail according to the critical switching accessibility index.

Description

Method and system for detecting protective performance of concrete guardrail of expressway Technical Field The invention relates to the technical field of concrete guardrail protective performance detection, in particular to a method and a system for detecting the protective performance of a concrete guardrail of an expressway. Background Along with the continuous improvement of expressway traffic and vehicle running speed, concrete guardrails arranged at bridge, tunnel entrance and roadbed splicing positions become important anti-collision facilities for restraining running tracks of uncontrolled vehicles and reducing accidents beyond the road side. Especially in the adjacent connected region of bridge expansion joint, receive structure temperature variation, concrete shrinkage creep, support displacement, construction error and long-term traffic load repetitive effect's influence, guardrail fence face and expansion joint edge position appear local high difference, vertical dislocation and linear geometric discontinuity phenomenon such as unsmooth easily, and the inside reinforcing bar anchor of this region and construction detail have the difference with ordinary continuous fence face simultaneously, and overall rigidity and atress transfer path are more complicated. When a vehicle passes through a road section near an expansion joint at a higher speed, a certain incidence deflection angle and a certain transverse deflection are generated on the vehicle relative to the road direction due to driving operation deviation, crosswind disturbance and road surface flatness change, once the vehicle contacts with a local geometric discontinuous part, the vehicle is possibly induced to be changed from a rail surface to be in concentrated contact close to a joint edge, the risk of collision of the guardrail is increased, and therefore, special detection and evaluation of protective performance are required to be carried out on the adjacent concrete guardrail connecting area of the expansion joint. The existing inspection of the protection capability of the concrete guardrail of the expressway is based on the checking calculation of the anti-collision grade or the small amount of real vehicle collision test in the design stage, and the disease condition of the guardrail is mainly judged by visual inspection, local geometric measurement or simple static detection means in the operation stage. The method generally regards the adjacent area of the expansion joint as the same structure with the common straight guardrail, does not consider the relation between geometric fluctuation of the seam edge, the change of the connecting rigidity of the guardrail, the incident angle of the vehicle, the lateral clearance and other operation parameters, is difficult to quantify the boundary conditions of the centralized contact transition from the surface contact to the seam edge of the vehicle under different driving working conditions, and meanwhile, lacks the sectional risk distribution information along the arc length direction of the expansion joint, is difficult to identify the local weak area in time and provides basis for fine maintenance and reinforcement. Disclosure of Invention The invention aims to solve the problem that in the prior art, the protection performance of a bridge expansion joint adjacent to a concrete guardrail connecting area is difficult to quantitatively evaluate and identify a local high-risk section under the condition of comprehensively considering the influence of the space form, the running state and the connecting rigidity of the guardrail, and provides a detection method and a detection system for the protection performance of the concrete guardrail of an expressway. In order to solve the problems existing in the prior art, the invention adopts the following technical scheme: a highway concrete guardrail protective performance detection method comprises the following steps: S1, performing three-dimensional measurement on a concrete guardrail surface and an expansion joint, establishing a reference plane based on a three-dimensional measurement point set, and calculating a normal slight dislocation and a tangential step from a seam edge of the expansion joint to the reference plane; S2, calculating an incidence small deflection angle of the vehicle relative to a road and a normal geometric distance from the front wheel of the vehicle to a reference plane according to the course angle of the vehicle, the geometric center of the front wheel and the road direction; S3, determining a surface contact equivalent intrusion quantity according to the normal geometric distance of the front wheel of the vehicle, and determining a side contact equivalent intrusion quantity by combining a normal micro-error platform, a tangential step and an incidence small deflection angle; S4, arranging vibration measuring points at the positions of the seam edge of the expansion joint and the rail surface of the concrete guar