CN-121982870-A - Multisource deformation monitoring and early warning method and system for construction stage of super high-rise large overhanging concrete structure

CN121982870ACN 121982870 ACN121982870 ACN 121982870ACN-121982870-A

Abstract

The application discloses a multisource deformation monitoring and early warning method and system in a construction stage of a super high-rise large cantilever concrete structure, and belongs to the technical field of concrete structure construction early warning. The early warning method abandons the traditional fixed threshold method based on Gaussian distribution assumption, models tail characteristics of shaping residual errors by utilizing generalized pareto distribution, can adaptively adjust the early warning threshold according to statistical characteristics of real-time data, and effectively reduces the reporting missing risk of sudden and hidden damages by matching with a grading mechanism of trend early warning and extremum warning, thereby remarkably improving the safety guarantee level of the construction process.

Inventors

TANG YUEHUA
ZHANG XINXIANG
LI ZEYAO
ZENG WEIMING
HE XUN
TANG NA
HU BINGYU
YIN CHEN

Assignees

四川省建筑机械化工程有限公司
四川省建筑科学研究院有限公司

Dates

Publication Date: 20260505
Application Date: 20260409

Claims (10)

1. The multisource deformation monitoring and early warning method for the construction stage of the super high-rise large cantilever concrete structure is characterized by comprising the following steps of: S1, establishing a refined finite element model of a super high-rise cantilever structure, and constructing a rigidity topological state space based on a preset construction working condition sequence to generate a dynamic physical reference sequence changing along with working conditions; S2, acquiring multisource sensing data of the super high-rise cantilever structure in real time, calculating physical deviation by combining the dynamic physical reference sequence, decomposing the physical deviation by using a modal decomposition algorithm, and extracting an environmental trend item and a high-frequency residual error item; s3, establishing a metabolism gray prediction model to perform rolling prediction on the environmental trend item, calculating a shaping residual error, and eliminating non-damaging drift caused by environmental and time-varying factors; and S4, modeling the tail features of the shaping residual errors based on extremum statistical distribution, calculating a dynamic grading early warning threshold value, and triggering corresponding early warning response according to the comparison result of the real-time shaping residual errors and the dynamic grading early warning threshold value.
2. The multi-source deformation monitoring and early warning method for the construction stage of the super high-rise large cantilever concrete structure according to claim 1 is characterized in that the step S1 of constructing a rigidity topological state space comprises the steps of defining a discretized construction working condition sequence, enabling each working condition to correspond to a specific stage in a construction process, enabling or killing corresponding units in each working condition by means of a unit enabling and killing technology in finite element analysis, calculating a theoretical displacement field under the working condition, and introducing a time correction coefficient reflecting the shrinkage creep influence of concrete to correct the theoretical displacement field so as to generate the dynamic physical reference sequence.
3. The multi-source deformation monitoring and early warning method for the construction stage of the super high-rise large cantilever concrete structure is characterized in that the step S2 of extracting an environmental trend item and a high-frequency residual item comprises the steps of calculating a difference value between multi-source sensing data acquired in real time and the dynamic physical reference sequence to be used as a physical deviation, decomposing the physical deviation by utilizing an adaptive noise complete set empirical mode decomposition algorithm to obtain an intrinsic mode function component and a residual component, calculating the correlation between each intrinsic mode function component and environmental temperature data, reconstructing the component with the correlation higher than a preset threshold value as the environmental trend item, and reconstructing the other components as the high-frequency residual item.
4. The multi-source deformation monitoring and early warning method for the construction stage of the super high-rise large cantilever concrete structure is characterized in that the step S3 is characterized in that a metabolism gray prediction model is built, wherein the method comprises the steps of selecting the nearest data point as a modeling sequence, building a whitening differential equation describing the development trend of the sequence, estimating model parameters by using a least square method, solving a time response function to obtain an environmental impact predicted value at the next moment, removing the oldest data and adding new data after new data are obtained, updating the model parameters in real time, and calculating the difference value between the physical deviation and the environmental impact predicted value to be used as the shaping residual.
5. The multi-source deformation monitoring and early warning method for the construction stage of the super high-rise large cantilever concrete structure according to claim 1 is characterized in that the step S4 of calculating the dynamic grading early warning threshold comprises the steps of selecting data exceeding a basic noise level in the shaping residual as a super threshold sequence, estimating scale parameters and shape parameters of generalized pareto distribution in real time by using a maximum likelihood estimation method, and combining the scale parameters and the shape parameters according to a preset extremely high risk probability to obtain the dynamic early warning threshold which dynamically changes along with time.
6. The method for monitoring and early warning multi-source deformation of the super high-rise large cantilever concrete structure at construction stage according to claim 5, wherein the step S4 of triggering corresponding early warning response comprises the steps of triggering a first-stage trend early warning when the mean value of the real-time shaping residual errors is monitored to be changed, and triggering a second-stage extreme value alarm when a single real-time shaping residual error value is monitored to exceed the dynamic early warning threshold value.
7. The multi-source deformation monitoring and early warning system for the construction stage of the super high-rise large overhanging concrete structure is characterized by comprising a physical reference construction module, a data acquisition and decoupling module, a residual shaping and trend elimination module and a dynamic early warning decision module, wherein the physical reference construction module is used for establishing a refined finite element model of the super high-rise overhanging structure, constructing a rigidity topological state space based on a construction working condition sequence and generating a dynamic physical reference sequence which changes along with the working condition, the data acquisition and decoupling module is used for acquiring multi-source sensing data in real time, calculating physical deviation by combining the dynamic physical reference sequence, extracting an environmental trend item and a high-frequency residual item by using a modal decomposition algorithm, the residual shaping and trend elimination module is used for establishing a metabolism gray prediction model to conduct rolling prediction on the environmental trend item, calculating shaping residual errors and eliminating non-damaging drift caused by environmental and time-varying factors, and the dynamic early warning decision module is used for modeling tail features of the shaping residual errors based on extreme value statistical distribution, calculating dynamic grading early warning thresholds and triggering early warning responses according to comparison results of the real-time shaping residual errors and the thresholds.
8. The multi-source deformation monitoring and early warning system for the construction stage of the super high-rise large cantilever concrete structure according to claim 7 is characterized in that the data acquisition and decoupling module is connected with a multi-source sensor network, the sensor network comprises a global navigation satellite system receiver, a fiber grating sensor, a temperature sensor and a wind speed meter, wherein the global navigation satellite system receiver is used for acquiring three-dimensional displacement data of key nodes of the cantilever structure, the fiber grating sensor is used for acquiring strain data of key components, the temperature sensor and the wind speed meter are used for acquiring environmental temperature and wind speed data, and the data acquisition and decoupling module is further used for carrying out time synchronization and resampling processing on all acquired data.
9. The multi-source deformation monitoring and early warning system for the construction stage of the super high-rise large cantilever concrete structure according to claim 7, wherein the physical reference construction module comprises a preset concrete creep prediction model for calculating a time correction coefficient which changes with time so as to correct the dynamic physical reference sequence.
10. The multi-source deformation monitoring and early warning system for the construction stage of the super high-rise large cantilever concrete structure according to claim 7, wherein the dynamic early warning decision module is configured to evaluate the risk of damage evolution according to the real-time estimated variation trend of the generalized pareto distribution shape parameter, and dynamically adjust the dynamic hierarchical early warning threshold according to the preset risk probability.

Description

Multisource deformation monitoring and early warning method and system for construction stage of super high-rise large overhanging concrete structure Technical Field The invention belongs to the technical field of concrete structure construction early warning, and particularly relates to a multisource deformation monitoring and early warning method and system in a super high-rise large cantilever concrete structure construction stage. Background The super high-rise large overhanging concrete structure is used as an important component of a modern urban landmark building, the construction process is complex, the period is long and the structure is obviously affected by the environment, and the structure can be subjected to a plurality of key working conditions such as template erection, concrete layered pouring, support system conversion and unloading, secondary loading and the like in the construction stage, and the structure is accompanied with continuous change of load paths and frequent switching of boundary conditions. Meanwhile, the concrete material has time-varying characteristics such as early-age shrinkage creep and the like, and the construction site environment such as temperature, sunlight, wind load and the like is complex and changeable. The conventional construction monitoring technology mainly depends on traditional manual measuring means such as total stations, level gauges and the like or adopts a single type of sensor to carry out point type monitoring, and the traditional methods have remarkable defects when facing to a super high-rise large overhanging structure, namely firstly, the conventional monitoring is often simply compared based on a static design reference value, and the structural rigidity mutation caused by construction working condition switching such as supporting unloading and normal deformation drift caused by material time-varying characteristics are ignored, so that a large number of false positives or false negatives are easy to generate. Secondly, the periodic deformation interference of the monitoring data caused by environmental noise such as temperature is serious, and the traditional filtering method is difficult to effectively decouple the environmental effect from the tiny abnormality caused by the real damage of the structure, so that early warning is delayed. Again, the existing early warning threshold is usually a fixed value based on experience or gaussian distribution assumption, and cannot adapt to the non-stationary characteristic of the structural response in the construction process, and it is difficult to capture an extreme abnormal event with low occurrence probability but serious consequences. Therefore, a multisource deformation monitoring and early warning method and system in the construction stage of the super high-rise large cantilever concrete structure, which can adapt to complex time-varying working conditions and can accurately eliminate environmental interference, are needed. Disclosure of Invention In order to solve the defect problems in the technical scheme, the invention aims to provide a multisource deformation monitoring and early warning method and system for a super high-rise large cantilever concrete structure in the construction stage. In order to achieve the above purpose, the first aspect of the present invention provides a method for monitoring and early warning multisource deformation in a construction stage of a super high-rise large cantilever concrete structure, comprising the following steps: s1, establishing a refined finite element model of the super high-rise cantilever structure, and constructing a rigidity topological state space based on a construction working condition sequence to generate a dynamic physical reference sequence changing along with the working condition. The refined finite element model needs to accurately define the geometric dimension, material property and boundary condition of the component, and particularly, for the concrete component, a material constitutive model reflecting the time-varying characteristic of the concrete component needs to be adopted. The construction working condition sequenceThe continuous construction process is discretized into a series of quasi-static structural states. Through the dead unit technology, aiming at each working conditionActivating or killing corresponding units, calculating theoretical displacement field under the working conditionStress field。 The dynamic physical reference sequenceThe rigidity mutation caused by working condition switching and the concrete early-age shrinkage creep effect are combined, and the calculation formula is as follows: Wherein, the To reflect the time-dependent coefficients of creep and contraction effects. And S2, acquiring multisource sensing data of the super high-rise cantilever structure in real time, calculating physical deviation by combining a dynamic physical reference sequence, carrying out modal decomposition on the ph