Research On Structural Deformation Monitoring Of Construction Process In Nanning China Resources Center

With the progress of society and the rapid development of the economy,super high-rise buildings continue to refresh the city’s skyline,and the structural system is becoming more and more complex,which brings great challenges to the construction of super high-rise buildings.The various loads,construction techniques and external factors during the construction period of super high-rise buildings have a great influence on the structural deformation.Therefore,it is necessary to carry out real-time deformation monitoring on the construction process of super high-rise buildings,denoising and analyzing the monitoring data,and combining The theoretical analysis of the deformation state of super high-rise buildings provides technical guidance for the safety and damage identification of super high-rise buildings.Based on the “Guangxi First High-rise Building” – Nanning China Resources Center under construction,this paper studies the construction site deformation monitoring program suitable for the project,establishes the finite element analysis model of the Nanning China Resources Center stage construction,and carries out the whole process construction simulation.Research and comparison with field measured data;proposed wavelet-adaptive Kalman filter combination analysis model,and applied it in this super high-rise project,achieved good results,the specific content is as follows:(1)Detailed description of the construction monitoring plan for structural displacement of the Nanning China Resources Center,and the establishment of three levels of plane control network for structural displacement monitoring of the Nanning China Resources Center.Before the main structure is capped,the whole station ismonitored by the combination of external measurement and internal control method.After the structure is capped,the total station and GPS combined monitoring method are used to monitor the horizontal displacement for a long time.(2)Establishing the finite element model of Nanning China Resources Center to carry out the whole process construction simulation study,and analyze the changes of vertical displacement and displacement difference of the core and outer frame columns of the tower during construction.The results show that with the increase of floor height,the maximum vertical displacement of the floor does not occur on the top floor of the structure,but on the middle floor.The vertical displacement curve of the floor shows the variation of the “fish belly type” on the two sides.(3)In-depth study on the horizontal displacement of the structure,comparing the effects of different shrinkage and creep modes on the horizontal displacement analysis;comparing the theoretical results of the finite element analysis with the actual monitoring values ??on the site;The variation curve shows the variation of the“fish belly type” on the two sides of the middle,that is,the horizontal displacement of the middle floor is large,and the horizontal displacement of the bottom and top floors is small;the ACI209-92 shrinkage creep prediction mode and the CEB-FIP90 shrinkage creep prediction mode are adopted.There is a certain difference in the calculated horizontal displacement,but the difference is not big and the trend is basically the same;the calculation results of the construction simulation analysis are different from the measured data,but the trend is generally consistent.(4)The theory and method of data analysis of deformation monitoring of engineering buildings are described in detail,including wavelet analysis and correlation theory of Kalman filtering,Kalman filter model of dynamic measurement system and determination method of initial value of Kalman filter.Were studied.In addition,a wavelet-adaptive Kalman filter combination analysis model is proposed and programmed by MATLAB.(5)Combining the deformation monitoring data of construction site,the optimal wavelet denoising model suitable for this super high-rise project is studied.The filtering effect of wavelet threshold denoising and variance compensation adaptive Kalman filtering is compared and analyzed.The research shows that the wavelet threshold denoising can smoothly smooth the curve spike of the monitoring data,and the data curve after wavelet denoising is more obvious than the original data,and the wavelet threshold is used for noise reduction.Compared with the wavelet thresholddenoising,the data residual residual fluctuation after the variance compensation adaptive Kalman filter filtering is small,and the variance of the residual value of the residual after the filtering process is smaller than the variance of the data residual after the wavelet threshold denoising.To be small,the variance compensation adaptive Kalman filter has more adaptability to dynamic deformation.(6)The wavelet-adaptive Kalman filter combination analysis model is proposed and applied to the deformation monitoring data analysis of super high-rise buildings for the first time.The filtering and prediction effects are studied in detail.The research shows that: compared with the variance The adaptive Kalman filter is compensated.The wavelet-adaptive Kalman filter with wavelet threshold denoising preprocessing has small fluctuations in the residual residual filter,and the filtering effect is improved to some extent.The wavelet-adaptive Kalman filter combination analysis model has a small difference between the overall predicted value and the actual value,and the prediction effect is better than the adaptive Kalman filter.It is also the optimal model for the data analysis of this super high-rise monitoring project.