CN-122016116-A - Method and system for monitoring stress of arc beam construction structure in real time

CN122016116ACN 122016116 ACN122016116 ACN 122016116ACN-122016116-A

Abstract

The invention relates to the technical field of structural health monitoring, and discloses a method and a system for monitoring stress of an arc beam construction structure in real time. The method comprises the steps of capturing an original stress fluctuation signal from a sensing network, carrying out time domain slicing, extracting an energy peak value and an accumulated value of each slice, judging a stress event boundary according to a combination relation, and generating an event record table. Dividing construction stage segments based on the table, counting event density and time interval, and drawing stress evolution tracks of each stage by combining space coordinates to generate an evolution distribution diagram. Analyzing the distribution diagram, identifying the region where the stress track converges or diverges as a potential conduction junction, and constructing a stress conduction path radiating from the junction to the surrounding by tracking the gradient change direction of the stress value, so as to generate a stress conduction path topological structure. The invention can more accurately identify stress events and dynamically reveal the conduction path and mechanism of stress in the arc beam.

Inventors

ZHANG JUN
LUO RONGDE
GAN SHUO
CHEN GANLIN
LIU HONG
Qin Peidong

Assignees

中建五局第三建设有限公司

Dates

Publication Date: 20260512
Application Date: 20260128

Claims (10)

1. The method for monitoring the stress of the arc beam construction structure in real time is characterized by comprising the following steps of: Capturing an original stress fluctuation signal from a sensing network arranged on an arc beam structure, performing time domain slicing on the original stress fluctuation signal, extracting an energy peak value and an energy accumulated value of stress fluctuation in each time slice, judging the starting and ending boundaries of a stress event according to the combination relation of the energy peak value and the energy accumulated value, and generating a stress occurrence event record table; Dividing a time axis of the whole construction process into a plurality of continuous construction stage fragments based on the stress occurrence event record table, counting the density of stress occurrence events and the time interval of adjacent events in each construction stage fragment, and drawing the evolution track of the stress on the structure in the construction stage fragment by combining the space coordinate information of the arc beam to generate a construction stage stress evolution distribution map; analyzing the stress evolution distribution diagram of the construction stage, identifying a space region in which the stress evolution track shows converging or diverging characteristics, marking the space region as a potential stress conduction junction, and constructing a stress conduction path radiating from the potential stress conduction junction to surrounding monitoring points by tracking the change direction of the stress value gradient to generate a stress conduction path topological structure.
2. The method for monitoring stress of an arc beam construction structure in real time according to claim 1, wherein the stress occurrence event record table comprises a unique identification code of a stress event, an event start time stamp, an event end time stamp, an energy peak amplitude and an energy accumulation total amount, the construction stage stress evolution distribution map comprises a construction stage number, a stage internal stress event density cloud map, a stage time span and a structural space stress track line, and the stress conduction path topological structure comprises a conduction path identification, a path start pivot coordinate, a path node sequence and a path-to-node conduction direction.
3. The method for monitoring stress of an arc beam construction structure in real time according to claim 1, wherein the step of generating the stress evolution distribution map in the construction stage comprises the following steps: reading the starting time stamp and the ending time stamp of all the events in the stress occurrence event record table, defining a continuous time interval with the event interval smaller than a construction stage division threshold value as a construction stage segment based on natural clustering of the events on a time axis, and distributing a stage number for each construction stage segment; For each construction stage segment, all the stress occurrence event records contained in the construction stage segment are called, the structural space coordinates corresponding to each event are extracted, the number of the stress events in unit area or unit length is calculated, and the stress event density distribution of the construction stage segment on the structure is generated; And connecting points which are similar in density and are continuous in space according to the density distribution of the stress events to form a closed contour representing a stress activity area, tracking a central position moving connecting line of the closed contour between segments in different construction stages, and generating a stress evolution distribution diagram in the construction stage.
4. The method for monitoring the stress of the arc beam construction structure in real time according to claim 3, wherein the step of generating the topology structure of the stress conduction path comprises the following steps: Analyzing each closed contour in the stress evolution distribution diagram of the construction stage, calculating a gradient vector of the accumulated total energy of each point stress event in the contour, identifying a streamline which is clear in a gradient vector field and converged at a certain point or a plurality of points, and marking the convergence point of the streamline as a potential stress conduction junction; Tracking from each potential stress conduction junction along the gradient vector field streamline which diverges outwards, recording the positions of all monitoring points which the streamline passes, and arranging the monitoring points in sequence according to the streamline direction to form a complete path from the junction to the tail end; And distributing independent identifiers for each complete path, recording the space coordinates of all nodes on the paths and the direction relation among the nodes, and summarizing all path information to generate a stress conduction path topological structure.
5. The method for monitoring the stress of the arc-shaped beam construction structure in real time according to claim 4, wherein the method further comprises the following steps: matching the topological structure of the stress conducting path with a real-time stress occurrence event record table, determining to which stress conducting path the newly occurring stress event belongs, calculating the relative position and energy contribution degree of the stress occurrence event on the path, and generating a stress event and conducting path association mapping table; and according to the stress event and conduction path association mapping table, counting the sum of energy peaks and event occurrence frequency of all stress events flowing through the stress conduction path in the last evaluation time window for each stress conduction path, evaluating the current activity level and energy load level of the stress conduction path, and generating a path real-time state evaluation report.
6. The method for monitoring the stress of the arc beam construction structure in real time according to claim 5, wherein the step of generating the real-time state evaluation report of the passage is specifically: Setting a sliding time window for each conduction path defined in the stress conduction path topological structure, and acquiring all stress occurrence event records falling into the sliding time window in real time; Screening all stress events belonging to a current evaluation conduction path according to the stress event and conduction path association mapping table, calculating the sum of energy peaks of the events as an intra-window energy load value of the stress conduction path, and simultaneously counting the number of the events as the intra-window event active frequency; Comparing the energy load value in the window with a preset energy load threshold, comparing the active frequency of the event in the window with a preset active frequency threshold, and combining the two comparison results to judge whether the current conduction path is in an idle state, a normal load state or an overload early warning state, so as to generate a path real-time state evaluation report.
7. The method for monitoring the stress of the arc-shaped beam construction structure in real time according to claim 6, wherein the method further comprises the following steps: Based on the real-time state evaluation report of the channel, conducting channels marked as overload early warning states are monitored in a key way, historical stress release rates of all nodes on the conducting channels are analyzed, stress accumulation trend at the tail ends of the channels under the current load is predicted, and a stress release and dredging strategy for the conducting channels is formed; and dynamically adjusting the sampling frequency and the signal gain of the sensing network corresponding to the key nodes on the conducting path according to the stress release dredging strategy, and generating a series of auxiliary construction suggestion operation sequences for relieving stress accumulation.
8. The method for monitoring the stress of the arc beam construction structure in real time according to claim 7, wherein the forming step of the stress release and dredging strategy specifically comprises the following steps: Extracting historical stress time course data of all nodes on the stress conduction path aiming at each conduction path marked as an overload early warning state in the real-time state evaluation report of the path, and fitting a curve model of the stress value of each node in a stress release stage along with time; calculating stress wave transfer delay and release rate attenuation coefficients from a pathway starting hub to an end node based on the curve models of all nodes, and simulating a curve of stress accumulation of the end node over time in a future period of time under the current continuous energy load input; And judging whether the stress accumulation curve of the end node exceeds a structural safety threshold according to the simulated stress accumulation curve of the end node in the future period, if so, planning and adjusting the loading sequence or rate of the upstream construction to generate a stress release dredging strategy comprising specific intervention time and operation parameters.
9. The method for monitoring the stress of the arc-shaped beam construction structure in real time according to claim 8, wherein the method further comprises the following steps: converting the stress release grooming strategy into a specific monitoring task instruction set, wherein the monitoring task instruction set comprises a target conduction path identifier, a key node list, enhanced sampling parameters and an expected stress change mode; and executing the monitoring task instruction set, performing enhanced monitoring on the target conduction path, comparing the acquired enhanced monitoring data with the expected stress change mode in real time, and dynamically fine-adjusting the operation parameters in the stress release and dredging strategy according to the comparison result to form closed-loop control.
10. A real-time monitoring system for stress of an arc beam construction structure, comprising a memory, a processor and a computer program stored in the memory and running on the processor, characterized in that the processor, when executing the computer program, realizes the steps of the real-time monitoring method for stress of an arc beam construction structure according to any one of claims 1 to 9.

Description

Method and system for monitoring stress of arc beam construction structure in real time Technical Field The invention relates to the technical field of structural health monitoring, in particular to a method and a system for monitoring stress of an arc beam construction structure in real time. Background In the construction process of complex structures such as arc beams, real-time and accurate monitoring of the internal stress state is a key for ensuring construction safety and structural performance. The prior art generally implements monitoring by distributing a sensor network over a structure, continuously collecting stress or vibration signals. For identifying stress events, conventional methods mainly rely on setting a fixed amplitude threshold or performing simple filtering processing on a signal, and determining an event when the signal amplitude exceeds a preset threshold. Under the conditions of large noise interference and variable signal characteristics of a construction environment, the method can easily misjudge a transient noise peak as an effective event, or can not effectively capture slow stress change with lower amplitude but continuously accumulated energy, so that the event identification accuracy and integrity are insufficient. After discrete stress event data are obtained, existing analysis means focus on static display of stress values of monitoring points or generation of stress cloud images based on numerical interpolation. The means can statically reflect the stress magnitude and the spatial distribution at a specific moment, but cannot describe the continuous evolution trend of the stress state in the time dimension, and cannot reveal the dynamic transmission process of the stress in the structural space. For a structure with a nonlinear arc Liang Zhechong force flow path, a static distribution diagram cannot clearly indicate the evolution source of a stress concentration region, and it is difficult to judge how stress is transmitted from a high-stress region to other parts, so that understanding of the evolution of the overall mechanical behavior of the structure stays at a representation level. Disclosure of Invention The invention aims to provide a method and a system for monitoring stress of an arc beam construction structure in real time, which are used for solving the problems in the background technology. In order to achieve the above purpose, the invention provides a method for monitoring stress of an arc beam construction structure in real time, which comprises the following steps: Capturing an original stress fluctuation signal from a sensing network arranged on an arc beam structure, performing time domain slicing on the original stress fluctuation signal, extracting an energy peak value and an energy accumulated value of stress fluctuation in each time slice, judging the starting and ending boundaries of a stress event according to the combination relation of the energy peak value and the energy accumulated value, and generating a stress occurrence event record table; Dividing a time axis of the whole construction process into a plurality of continuous construction stage fragments based on the stress occurrence event record table, counting the density of stress occurrence events and the time interval of adjacent events in each construction stage fragment, and drawing the evolution track of the stress on the structure in the construction stage fragment by combining the space coordinate information of the arc beam to generate a construction stage stress evolution distribution map; analyzing the stress evolution distribution diagram of the construction stage, identifying a space region in which the stress evolution track shows converging or diverging characteristics, marking the space region as a potential stress conduction junction, and constructing a stress conduction path radiating from the potential stress conduction junction to surrounding monitoring points by tracking the change direction of the stress value gradient to generate a stress conduction path topological structure. Preferably, the stress occurrence event record table comprises a unique identification code of a stress event, an event starting time stamp, an event ending time stamp, an energy peak amplitude and an energy accumulation total amount, the construction stage stress evolution distribution map comprises a construction stage number, a stage internal stress event density cloud chart, a stage time span and a structural space stress track line, and the stress conduction path topological structure comprises a conduction path identification, a path starting pivot coordinate, a path node sequence and a node-to-node conduction direction. Preferably, the step of generating the stress evolution distribution map in the construction stage specifically includes: reading the starting time stamp and the ending time stamp of all the events in the stress occurrence event record table, defining a continuous time i