Reverse correction modeling method for construction of vertical deformation difference of inner cylinder and outer frame of super high-rise building

Abstract

The invention discloses a super high-rise building inner cylinder and outer frame vertical deformation difference construction reverse correction modeling method, and belongs to the technical field of super high-rise building concrete-profile steel mixed structure numerical simulation, and the method comprises the following steps: 1, building a finite element model according to a construction process and material time-varying characteristics; 2, deformation monitoring is conducted in the whole construction process, and an actually-measured relative vertical deformation difference value set is obtained; 3, performing reverse correction on the finite element model based on the actually measured relative vertical deformation difference value set to obtain a corrected finite element model; and 4, on the basis of the corrected finite element model, performing future relative vertical deformation difference prediction of the inner cylinder and the outer frame and construction adjustment amount guidance. According to the method, 'deviation correction 'of the finite element model is realized, a closed-loop modeling and analysis process capable of being iteratively optimized is formed, and the problem of'inaccurate calculation' is fundamentally solved.

Description

Technical Field

[0001] This invention relates to the field of numerical simulation technology for concrete-steel hybrid structures of super high-rise buildings, specifically to a method for reverse correction modeling of vertical deformation difference between the inner cylinder and outer frame of super high-rise buildings. Background Technology

[0002] Super high-rise buildings (height ≥ 200m) generally adopt a structural system of "reinforced concrete inner tube (core tube) + outer steel frame (steel pipe) - concrete composite structural column". Due to the difference in elastic modulus between the core tube and the outer frame column, the shrinkage and creep of the steel are significantly different. At the same time, the construction period of super high-rise structures is long (>18 months), the vertical load increases layer by layer, and the time-varying effect of concrete is prominent. Conventional methods for calculating the vertical deformation difference between the inner tube and outer frame of super high-rise buildings have the following problems: (1) The simplified algorithm in the standard only provides a one-time loading estimate, which cannot reflect the actual construction process. As a result, the measured value of the vertical deformation difference between the inner cylinder and the outer frame after the structure is completed is significantly different from the calculated value, causing systemic failures in the curtain wall, elevator guide rail, and electromechanical pipeline system. (2) Although the finite element software can activate the elements layer by layer, the material parameters (creep, shrinkage, elastic modulus, etc.) are still taken as fixed values ​​according to the standard table. It is impossible to use the field measured data for reverse correction. It belongs to "open loop" prediction, and the accuracy and robustness are insufficient.

[0003] Based on this, the present invention designs a reverse correction modeling method for the vertical deformation difference between the inner core and outer frame of a super high-rise building to adapt to complex and ever-changing dynamic environments and meet practical application requirements. Summary of the Invention

[0004] To address the shortcomings of existing technologies in conventional calculation methods for the vertical deformation difference of the inner core and outer frame of super high-rise buildings, which are "inaccurate, uncontrollable, and unusable," this invention provides a reverse correction modeling method for the vertical deformation difference of the inner core and outer frame of super high-rise buildings.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A reverse modeling method for correcting vertical deformation differences between the inner core and outer frame of a super high-rise building during construction includes the following steps: Step 1: Establish a finite element model based on the construction process and the time-varying properties of materials; Step 2: Monitor deformation throughout the construction process and obtain a set of measured relative vertical deformation differences. ; Step 3: Based on the measured relative vertical deformation difference set The finite element model is then reverse-corrected to obtain the corrected finite element model; the specific operations of step 3 are as follows: Step 31: Define the objective function and the parameters to be corrected: Set the time-varying material parameters to be corrected as follows: The theoretical vertical deformation difference calculated using the finite element model Difference between relative vertical deformation Minimizing the error between them is the correction objective; therefore, an objective function is constructed. Step 32: Time-varying material parameters to be corrected Inversion optimization was performed to obtain the optimal time-varying material parameters. ; Step 33: Calculate the optimal time-varying material parameters obtained through inversion. The corrected finite element model is obtained by updating the time-varying material in the finite element model. Step 4: Based on the modified finite element model, predict the relative vertical deformation difference between the inner cylinder and the outer frame and guide the construction adjustment amount.

[0006] Furthermore, the specific steps for step 1 are as follows: Step 11: Basic Model Establishment: Using finite element software and based on the design drawings, establish a rod system model containing structural elements; Step 12: Construction process simulation: According to the actual construction plan and flow rhythm, determine the difference N between the number of layers of the inner cylinder and the outer frame that are constructed first. Activate the structural units layer by layer in the pole model and apply the dead load and construction live load corresponding to the difference N of the number of layers simultaneously. Step 13: Embedding the time-varying material model: Embed the elastic constitutive model of steel and the time-varying property constitutive model of concrete into the rod system model to obtain the finite element model.

[0007] Furthermore, the constitutive model for time-varying characteristics is the CEB-FIP model, the ACI model, or the GL2000 model.

[0008] Furthermore, the specific steps for step 2 are as follows: Step 21: Install vertical displacement monitoring equipment on designated floors of the inner core shear wall and outer frame columns of the super high-rise building; Step 22: From the moment the main structure emerges from the ground until the main structure is topped out, the absolute elevation and relative vertical deformation difference between the inner core and the outer frame of the super high-rise building are collected synchronously according to the construction nodes. This forms a set of measured relative vertical deformation differences arranged according to construction time nodes. .

[0009] Furthermore, the objective function is as follows: .

[0010] Furthermore, the specific steps in step 32 are as follows: Step 321: Substitute the initial time-varying material parameter X0 to be corrected into the finite element model of Step 1, and perform full-process finite element construction simulation calculation to obtain the initial deformation value; Step 322: The target correction optimization algorithm adjusts the value of the time-varying material parameter X; The target correction optimization algorithm can be a genetic algorithm, a simulated annealing algorithm, or a PID control algorithm. Step 323: After each adjustment of the material parameter X, the finite element model is rerun to perform a full-process finite element construction simulation calculation to calculate the new parameters. and the corresponding objective function value ; Step 324: Iterate through the calculations until... The optimal time-varying material parameters are obtained by converging to a preset tolerance threshold or reaching the maximum number of iterations. .

[0011] Furthermore, time-varying material parameters include the creep coefficient and shrinkage strain coefficient of the creep model.

[0012] Furthermore, the specific steps for step 4 are as follows: Step 41: High-precision prediction: Using the corrected finite element model, continue to simulate the subsequent construction stages that have not yet been carried out, and predict the development curve of the relative vertical deformation difference between the inner core and outer frame of the super high-rise building until the structure is topped out and even after completion. ; Step 42: Calculation of Construction Adjustment Amount: Based on the predicted development curve of the relative vertical deformation difference between the inner core and outer frame of the super high-rise building. Calculate the elevation compensation value that needs to be pre-applied during current construction to offset the relative vertical deformation difference that will occur at a future construction node: Step 43: Closed-loop control implementation: Apply the calculated construction adjustment amount to the actual construction; at the same time, continue to perform the monitoring in step one in subsequent construction to obtain new measured data. Steps 3 to 4 can be repeated periodically or as needed to further correct and update the variable material parameters of the corrected finite element model.

[0013] Beneficial effects: This invention provides a reverse correction modeling method that is "observable during construction phase → correctable model parameters → closed-loop control of relative vertical deformation difference". It dynamically and inversely feeds back real-time deformation monitoring data throughout the construction cycle to the finite element model to correct key time-varying material parameters, thereby achieving "correction" of the finite element model and forming an iteratively optimized closed-loop modeling and analysis process, fundamentally solving the problem of "inaccurate calculation". This invention applies the theory of time-varying material parameters inversion to the analysis of the construction stage. It uses the measured vertical deformation difference between the inner cylinder and the outer frame as the objective function to identify and correct the time-varying material parameters in the finite element model in reverse, so that the output of the finite element model is in high agreement with the measured data, which significantly improves the accuracy of the model in subsequent construction stages. Based on the conventional layer-by-layer activation unit simulation of the construction process, this invention dynamically updates the time-varying material parameters after reverse correction to the material constitutive model of the constructed and unconstructed floors. This coupled iteration of "forward construction simulation" and "reverse parameter update" realizes the refined simulation of the time-varying behavior of the structure under ultra-long construction cycle and complex load history. This invention can separately acquire and correct the time-varying material parameters of the inner cylinder concrete and the outer frame composite column, clearly distinguishing the differences in their contributions to shrinkage, creep and elastic deformation. Based on this, it can perform regional and differentiated precise calculations and guidance for subsequent construction work such as formwork elevation over-adjustment and on-site cutting adjustment of steel columns, realizing a leap from "passive deformation monitoring" to "active deformation prediction and control". Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0015] Figure 1 This is a flowchart of the reverse correction modeling method for the vertical deformation difference of the inner core and outer frame of a super high-rise building, according to the present invention. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0017] Example 1: Please refer to Figure 1 A reverse modeling method for correcting vertical deformation differences between the inner core and outer frame of a super high-rise building during construction includes the following steps: Step 1: Establish a finite element model based on the construction process and the time-varying properties of materials; The specific steps for step 1 are as follows: Step 11: Basic Model Establishment: Using finite element software and based on the design drawings, establish a rod system model containing structural elements; The structural unit includes the inner tube (core tube), outer frame columns, floor slabs, and beams; The finite element method software to use is either ABAQUS or MIDAS. Step 12: Construction process simulation: According to the actual construction plan and flow rhythm, determine the difference N between the number of layers of the inner cylinder and the outer frame that are constructed first. Activate the structural units layer by layer in the pole model and apply the dead load and construction live load corresponding to the difference N of the number of layers simultaneously. Step 13: Embedding the time-varying material model: Embed the elastic constitutive model of steel and the time-varying property constitutive model of concrete into the rod system model to obtain the finite element model; The constitutive model for time-varying characteristics is the CEB-FIP model, the ACI model, or the GL2000 model; The time-varying constitutive model is designed for the selection of concrete materials, and the age of concrete materials is a factor to be considered in the selection of concrete materials. The inputs to the time-varying constitutive model include the shrinkage strain coefficient, creep function, ambient humidity, and structural element dimensions initially selected from the construction specifications. The elastic constitutive model of steel is used for steel and structural steel. Step 2: Monitor deformation throughout the construction process and obtain a set of measured relative vertical deformation differences. ; The specific steps for step 2 are as follows: Step 21: Install vertical displacement monitoring equipment on designated floors of the inner core shear wall and outer frame columns of the super high-rise building; Let the number of floors be n.

[0018] Vertical displacement monitoring equipment uses a hydrostatic level or a high-precision total station; Step 22: From the moment the main structure emerges from the ground until the main structure is topped out, the absolute elevation and relative vertical deformation difference between the inner core and the outer frame of the super high-rise building are collected synchronously according to the construction nodes. This forms a set of measured relative vertical deformation differences arranged according to construction time nodes. ; ; Step 3: Based on the measured relative vertical deformation difference set The finite element model is reverse-corrected to obtain the corrected finite element model. The specific steps for step 3 are as follows: Step 31: Define the objective function and the parameters to be corrected: Set the time-varying material parameters to be corrected as follows: The theoretical vertical deformation difference calculated using the finite element model Difference between relative vertical deformation Minimizing the error between them is the correction objective; therefore, an objective function is constructed. The objective function is as follows: ; Time-varying material parameters include the creep coefficient and shrinkage strain coefficient of the creep model; Step 32: Time-varying material parameters to be corrected Inversion optimization was performed to obtain the optimal time-varying material parameters. ; The specific steps for step 32 are as follows: Step 321: Substitute the initial time-varying material parameter X0 to be corrected into the finite element model of Step 1, and perform full-process finite element construction simulation calculation to obtain the initial deformation value; Step 322: The target correction optimization algorithm adjusts the value of the time-varying material parameter X; The target correction optimization algorithm can be a genetic algorithm, a simulated annealing algorithm, or a PID control algorithm. Step 323: After each adjustment of the material parameter X, the finite element model is rerun to perform a full-process finite element construction simulation calculation to calculate the new parameters. and the corresponding objective function value ; Step 324: Iterate through the calculations until... The optimal time-varying material parameters are obtained by converging to a preset tolerance threshold or reaching the maximum number of iterations. ; Optimal Time-Varying Material Parameters That is, to make the finite element model calculation results best fit the current historical measured data of construction. Step 33: Calculate the optimal time-varying material parameters obtained through inversion. The corrected finite element model is obtained by updating the time-varying material in the finite element model. The correction of the finite element model not only targets the unconstructed parts, but also performs a "backward" calibration of the historical material properties of the constructed parts in the finite element model, making the finite element model closer to the real structural characteristics over the entire time axis. Step 4: Based on the modified finite element model, predict the relative vertical deformation difference between the inner cylinder and the outer frame and guide the construction adjustment amount. The specific steps for step 4 are as follows: Step 41: High-precision prediction: Using the corrected finite element model, continue to simulate the subsequent construction stages that have not yet been carried out, and predict the development curve of the relative vertical deformation difference between the inner core and outer frame of the super high-rise building until the structure is topped out and even after completion. ; Since the time-varying material parameters of the corrected finite element model have been optimized and are consistent with historical measured data, their predictive reliability and accuracy can be greatly improved. Step 42: Calculation of Construction Adjustment Amount: Based on the predicted development curve of the relative vertical deformation difference between the inner core and outer frame of the super high-rise building. Calculate the elevation compensation value that needs to be pre-applied during current construction to offset the relative vertical deformation difference that will occur at a future construction node: The future vertical relative deformation difference will be adjusted in the opposite direction, which will be the elevation compensation value. Pre-lift value of inner cylinder formwork elevation: Based on the predicted subsequent creep shrinkage and settlement of the inner cylinder, the active lifting amount of the formwork is determined when pouring concrete; Pre-adjustment amount for on-site cutting of outer frame steel columns: Based on the predicted relative vertical deformation difference between the inner cylinder and outer frame of the super high-rise building, determine the processing allowance or adjustment value of the on-site cutting elevation of the outer frame steel columns.

[0019] Step 43: Closed-loop control implementation: Apply the calculated construction adjustment amount to the actual construction; at the same time, continue to perform the monitoring in step one in subsequent construction to obtain new measured data. Steps 3 to 4 can be repeated periodically or as needed to further correct and update the variable material parameters of the corrected finite element model.

[0020] This forms a dynamic, closed-loop quality control cycle that runs through the entire construction process.

[0021] This invention provides a reverse correction modeling method that is "observable during construction phase → correctable model parameters → closed-loop control of relative vertical deformation difference". It dynamically and inversely feeds back real-time deformation monitoring data throughout the construction cycle to the finite element model to correct key time-varying material parameters, thereby achieving "correction" of the finite element model and forming an iteratively optimized closed-loop modeling and analysis process, fundamentally solving the problem of "inaccurate calculation". This invention applies the theory of time-varying material parameters inversion to the analysis of the construction stage. It uses the measured vertical deformation difference between the inner cylinder and the outer frame as the objective function to identify and correct the time-varying material parameters in the finite element model in reverse, so that the output of the finite element model is in high agreement with the measured data, which significantly improves the accuracy of the model in subsequent construction stages. Based on the conventional layer-by-layer activation unit simulation of the construction process, this invention dynamically updates the time-varying material parameters after reverse correction to the material constitutive model of the constructed and unconstructed floors. This coupled iteration of "forward construction simulation" and "reverse parameter update" realizes the refined simulation of the time-varying behavior of the structure under ultra-long construction cycle and complex load history. This invention can separately acquire and correct the time-varying material parameters of the inner cylinder concrete and the outer frame composite column, clearly distinguishing the differences in their contributions to shrinkage, creep and elastic deformation. Based on this, it can perform regional and differentiated precise calculations and guidance for subsequent construction work such as formwork elevation over-adjustment and on-site cutting adjustment of steel columns, realizing a leap from "passive deformation monitoring" to "active deformation prediction and control".

[0022] Furthermore, this invention also has the following characteristics in practical applications: 1. By adopting the "monitoring-correction" closed-loop method, the prediction error of relative vertical deformation difference before completion is greatly reduced, providing a reliable basis for construction leveling and pre-adjustment; 2. Quality control model innovation: It changes the traditional "open-loop prediction and post-event processing" to "dynamic correction and proactive control", which can guide pre-compensation measures such as formwork lifting and steel column cutting in real time, and control deformation from the source; 3. Effectively reduce engineering risks: Precise deformation control can significantly reduce quality risks such as curtain wall stress cracking, elevator guide rail misalignment, and pipeline connection failure caused by deformation inconsistency, avoiding high maintenance costs later; 4. Optimize construction efficiency and cost: Based on accurate prediction and pre-intervention, the tedious on-site correction work such as chiseling and raising is reduced, saving materials and construction time and improving construction efficiency. 5. Forming reusable digital assets: The inversion parameters and correction models verified by the project can serve as valuable design experience and reference benchmarks for similar projects in the same region, promoting the overall improvement of the industry's design and construction standards.

[0023] In summary, the present invention upgrades traditional finite element numerical simulation into an intelligent decision-making tool that can be optimized in a closed loop, solving the industry pain points of "inaccurate calculation, uncontrollable, and unusable" deformation difference in super high-rise buildings.

[0024] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A reverse correction modeling method for vertical deformation difference between the inner core and outer frame of a super high-rise building, characterized by: Includes the following steps: Step 1: Establish a finite element model based on the construction process and the time-varying properties of materials; Step 2: Monitor deformation throughout the construction process and obtain a set of measured relative vertical deformation differences; Step 3: Perform reverse correction on the finite element model based on the measured relative vertical deformation difference set to obtain the corrected finite element model; the specific operations of step 3 are as follows: Step 31: Define the objective function and the parameters to be corrected: Set the time-varying material parameters to be corrected as follows: ; Theoretical vertical deformation difference calculated using the finite element model Difference between relative vertical deformation Minimizing the error between them is the correction objective; therefore, an objective function is constructed. Step 32: Time-varying material parameters to be corrected Inversion optimization was performed to obtain the optimal time-varying material parameters. ; Step 33: Calculate the optimal time-varying material parameters obtained through inversion. The corrected finite element model is obtained by updating the time-varying material in the finite element model. Step 4: Based on the modified finite element model, predict the relative vertical deformation difference between the inner cylinder and the outer frame and guide the construction adjustment amount.

2. The method for reverse correction modeling of vertical deformation difference between the inner core and outer frame of a super high-rise building according to claim 1, characterized in that, The specific steps for step 1 are as follows: Step 11: Basic Model Establishment: Using finite element software and based on the design drawings, establish a rod system model containing structural elements; Step 12: Construction process simulation: According to the actual construction plan and flow rhythm, determine the difference N between the number of layers of the inner cylinder and the outer frame that are constructed first. Activate the structural units layer by layer in the pole model and apply the dead load and construction live load corresponding to the difference N of the number of layers simultaneously. Step 13: Embedding the time-varying material model: Embed the elastic constitutive model of steel and the time-varying property constitutive model of concrete into the rod system model to obtain the finite element model.

3. The method for reverse correction modeling of vertical deformation difference between the inner core and outer frame of a super high-rise building according to claim 2, characterized in that, The constitutive model for time-varying characteristics is the CEB-FIP model, the ACI model, or the GL2000 model.

4. The method for reverse correction modeling of vertical deformation difference between inner core and outer frame of super high-rise buildings according to claim 1, characterized in that, The specific steps for step 2 are as follows: Step 21: Install vertical displacement monitoring equipment on designated floors of the inner core shear wall and outer frame columns of the super high-rise building; Step 22: From the moment the main structure emerges from the ground until the main structure is topped out, the absolute elevation and relative vertical deformation difference between the inner core and the outer frame of the super high-rise building are collected synchronously according to the construction nodes. This forms a set of measured relative vertical deformation differences arranged according to construction time nodes. .

5. The method for reverse correction modeling of vertical deformation difference between inner core and outer frame of super high-rise buildings according to claim 1, characterized in that, The objective function is as follows: 。 6. The method for reverse correction modeling of vertical deformation difference between inner core and outer frame of super high-rise buildings according to claim 5, characterized in that, The specific steps for step 32 are as follows: Step 321: Substitute the initial time-varying material parameter X0 to be corrected into the finite element model of Step 1, and perform full-process finite element construction simulation calculation to obtain the initial deformation value; Step 322: The target correction optimization algorithm adjusts the value of the time-varying material parameter X; The target correction optimization algorithm can be a genetic algorithm, a simulated annealing algorithm, or a PID control algorithm. Step 323: After each adjustment of the material parameter X, the finite element model is rerun to perform a full-process finite element construction simulation calculation to calculate the new parameters. and the corresponding objective function value ; Step 324: Iterate through the calculations until... The optimal time-varying material parameters are obtained by converging to a preset tolerance threshold or reaching the maximum number of iterations. .

7. The method for reverse correction modeling of vertical deformation difference between inner core and outer frame of super high-rise buildings according to claim 6, characterized in that, Time-varying material parameters include the creep coefficient and shrinkage strain coefficient of the creep model.

8. The method for reverse correction modeling of vertical deformation difference between inner core and outer frame of super high-rise buildings according to claim 7, characterized in that, The specific steps for step 4 are as follows: Step 41: High-precision prediction: Using the corrected finite element model, continue to simulate the subsequent construction stages that have not yet been carried out, and predict the development curve of the relative vertical deformation difference between the inner core and outer frame of the super high-rise building until the structure is topped out and even after completion. ; Step 42: Calculation of Construction Adjustment Amount: Based on the predicted development curve of the relative vertical deformation difference between the inner core and outer frame of the super high-rise building. Calculate the elevation compensation value that needs to be pre-applied during current construction to offset the relative vertical deformation difference that will occur at a future construction node: Step 43: Closed-loop control implementation: Apply the calculated construction adjustment amount to the actual construction; at the same time, continue to perform the monitoring in step one in subsequent construction to obtain new measured data. Steps 3 to 4 can be repeated periodically or as needed to further correct and update the variable material parameters of the corrected finite element model.

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