WO2019200953A1

WO2019200953A1 - Method for measuring and analyzing degree of building strength deterioration

Info

Publication number: WO2019200953A1
Application number: PCT/CN2018/121604
Authority: WO
Inventors: 刘子昂
Original assignee: 刘子昂
Priority date: 2018-04-20
Filing date: 2018-12-17
Publication date: 2019-10-24
Also published as: CN108846150B; CN108846150A

Abstract

A method for measuring and analyzing the degree of deterioration of building strength, characterized in comprising the following steps: establishing a model of a building structure; launching a coupling analysis, generating an input file and a calculation file required for analyzing the degree of strength deterioration, establishing a simplified overall model of the building structure, and calculating the degree of long-term strength deterioration of the structure. The present method utilizes a simulation calculation method, allows the degree of building strength deterioration to be measured on the basis of analyzed data, and is accurate and intelligent.

Description

Method for detecting and analyzing the degree of deterioration of building strength

Technical field

A method for detecting and analyzing the degree of strength degradation of a building belongs to the technical field of strength detection and analysis of the civil engineering structure.

Background technique

At present, most building structures cannot predict their own remaining life based on data monitored by sensors. This defect reduces the timeliness of monitoring the structural stability of the building, so that the maintenance personnel cannot perform the necessary repair and maintenance in time.

Summary of the invention

In view of this, the present invention provides a method for detecting and analyzing the degree of deterioration of a building, which is characterized by comprising the following steps:

S1. Use ANSYS software to build a model of the building structure, and generate load files and vibration files required for fatigue calculation according to the fatigue design conditions and specifications of the building;

S2, start the ANSYS-MATLAB interface, check the validity of the ANSYS software input file, call ANSYS software to carry out the coupling analysis under the combined action of load and vibration, and get the reaction of the building structure under the combined action of load and vibration;

S3, specify the calculation type of MATLAB software in the ANSYS-MATLAB interface, read the ANSYS software result file, generate the load file and calculation file required by MATLAB software calculation according to the specified analysis type, and store it in the working folder;

S4. Establish a simplified overall structural model of the building in MATLAB software, read the fatigue load file and calculation file generated by the ANSYS-MATLAB interface, analyze the degree of structural strength degradation, and obtain the equivalent static force under the combined action of load and vibration. The load is calculated by the formula 1:

Formula one:

Where V ₀ is the equivalent static load under the combined action of load and vibration, V is the static load under the load alone, i is the i-th floor in the building, n is the total number of buildings, x _i is Refers to the transverse vibration interference coefficient of the i-th layer in the building, y _i refers to the longitudinal vibration interference coefficient of the i-th layer in the building, x _i is a rational number greater than 0 and less than 1, and y _i is a rational number greater than 0 and less than 1. , α is a joint enhanced interference coefficient, and α is a rational number greater than 0 and less than 1;

Step S4 of S5, specifically includes the following modeling and calculation steps:

a. In the MATLAB software, a simplified model of the overall structure of the building is established, and the upper structure of the building is simplified to the node mass acting on its centroid position;

b. Based on the fatigue load design, the fatigue control load and the pile-soil nonlinear model of the return period are used to obtain the basic linear stiffness matrix;

c. Based on the overall structure of the building in step a, simplify the model and the basic linear stiffness matrix in step b, and simultaneously apply the fatigue load and calculation parameter setting files obtained from the building analysis to carry out the combined action of building loads and shock loads. Structural analysis of the overall structure of the building;

d. Based on the overall structural response analysis, obtain the equivalent stress of each key node of the structure, and set the analysis file of the intensity degradation degree, and carry out the structural fatigue calculation under the combined action of load and vibration;

e. Read the multi-case parallel calculation file generated by the interface, and perform parallel calculation of multiple working conditions;

S6. According to the load-strength curve, the degree of structural strength degradation under the combined action of different design loads and corresponding shock loads is obtained;

S7. Obtaining the degree of long-term strength degradation of the building structure according to the embrittlement criterion of the building structure;

S8. A structural analysis model for building strength degradation based on a semi-integral method;

S9. Using ANSYS software to establish a finite element model of the building infrastructure, and outputting the quality and stiffness matrix of the infrastructure;

S10, using the basic calculation program, reading the basic structure quality and stiffness matrix in step S9, performing polycondensation, and obtaining a building basic model matrix;

S11. Based on the model matrix in S10, build a building model in the ANSYS software, and generate a load file required for fatigue calculation according to the fatigue design working condition and the building specification;

S12, start the ANSYS-MATLAB interface, first check the validity of the ANSYS software input file, call the ANSYS software to carry out the structural reaction analysis under the load, and obtain the structural reaction under the load;

S13. Specify the calculation type of the MATLAB software in the ANSYS-MATLAB interface, read the ANSYS software result file, and generate the building load and calculation file of the building at the bottom of the building according to the specified analysis type, and store it in the working folder;

S14. Establish a building infrastructure model in the MATLAB software, read the building load file and the calculation file in step S14, generate a random wave according to the vibration component of the design vibration component, and carry out the joint action of the building load and the vibration load. Analysis of the structural response of the building to obtain the equivalent static load of the foundation;

S15, step S15, the basic structure finite element model in MATLAB software is based on the fatigue control load and the pile-soil nonlinear model to obtain the basic linear stiffness matrix;

S16. Using the load-strength curve to obtain the degree of deterioration of the strength of the building foundation under the combined action of different design loads and vibration elements;

S17. According to the brittleness criterion of the building, the degree of long-term strength degradation of the building infrastructure under load and vibration is obtained.

The beneficial result of the invention is that the invention provides a detection and analysis method for the degree of strength degradation of a building, and uses the simulation calculation method to detect the degree of deterioration of the building strength according to the analysis data, and is precise and intelligent; and has broad market prospect and application value. .

detailed description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly, the present invention will be described in detail below with reference to the embodiments. It should be noted that the specific embodiments described herein are only intended to explain the present invention, and are not intended to limit the invention, and that the products that can achieve the same function are equivalents and modifications, and are included in the scope of the present invention. The specific method is as follows:

Example 1: A 50-story building was used as the main research object, and it was analyzed by a method for detecting and analyzing the degree of deterioration of the building strength.

S1. Use ANSYS software to build a model of the building structure, and generate load files and vibration files required for fatigue calculation according to the fatigue design conditions and specifications of the 50-story building;

S2, start the ANSYS-MATLAB interface, check the validity of the ANSYS software input file, call ANSYS software to carry out the coupling analysis under the combined action of load and vibration, and get the reaction of the 50-story building structure under the combined action of load and vibration;

S4. Establish a simplified overall structure model of the 50-story building in MATLAB software, read the fatigue load files and calculation files generated by the ANSYS-MATLAB interface, and analyze the strength degradation degree of the 50-story building to obtain the equivalent of load and vibration. Static load

S5. Establish a simplified model of the overall structure of the 50-story building in MATLAB software, simplifying it to the node mass acting on its centroid position; based on the fatigue load design, the fatigue control load and the pile-soil nonlinear model to obtain the basic linearity Stiffness matrix; based on the simplified structure of the overall structure and the linear stiffness matrix, the fatigue load and the calculation parameter setting file obtained by the analysis are applied simultaneously, and the overall structural response analysis under the combined action of load and shock loads is carried out; the key nodes of the structure are obtained based on the overall structural response analysis. The equivalent stress, and the set strength degradation degree analysis file, carry out the structural fatigue calculation under the combined action of load and vibration; read the multi-case parallel calculation file generated by the interface, and carry out parallel calculation of multiple working conditions;

S7. According to the embrittlement criterion of the 50-story building structure, the degree of long-term strength degradation of the 50-story building structure is obtained;

S8. A 50-story building strength degradation analysis model based on a semi-integral approach;

S9. Using the ANSYS software to establish a finite element model of the 50-story building infrastructure, and output the quality and stiffness matrix of the infrastructure;

S10, using the basic calculation program, reading the basic structure quality and stiffness matrix in step S9, performing polycondensation, and obtaining a 50-story building foundation model matrix;

S11. Based on the model matrix in S10, a 50-story building model is established in ANSYS software, and load files required for fatigue calculation are generated according to the fatigue design conditions and building codes;

S13. Specify the calculation type of MATLAB software in the ANSYS-MATLAB interface, read the ANSYS software result file, and generate the 50-storey building load and calculation file of the 50-storey building to be calculated according to the specified analysis type, and store it in the working folder. ;

S14. Establish a 50-story building infrastructure model in MATLAB software, read the 50-story building load file and calculation file in step S14, set the vibration spectrum parameters according to the design vibration elements to generate random waves, and carry out 50-storey building load and vibration load combination. The basic structure response analysis of the 50-story building under the action, the equivalent static load of the foundation structure is obtained;

S16. Using the load-strength curve to obtain the degree of deterioration of the foundation strength of the 50-story building under the combined action of different design loads and vibration elements;

S17. According to the 50-story building embrittlement criterion, the degree of long-term strength degradation of the 50-story building foundation under load and vibration is obtained.

The results of each step are passed to MATLAB in the ANSYS run to calculate the next load and cell properties.

ANSYS and MATLAB exchange data, first of all to deal with the coordination problem, generally can use the following two methods:

(1) ANSYS and MATLAB run simultaneously: need to create a flag file. By reading the contents in ANSYS and the program to determine whether the other party is running; after ANSYS and MATLAB run a step, change the flag, tell the other party that the current run is over, the other party can continue to run, otherwise you must wait.

(2) Execute MATLAB by calling the /SYS command in ANSYS. At this point, ANSYS will temporarily stop running until MATLAB finishes running and return the execution right to ANSYS.

In MATLAB, tell ANSYS to change cell properties and load changes: After importing data from ANSYS, MATLAB can generally create a .mac file based on a specific physical model, and then write APDL commands such as MPCHG in this file; for example, create a C with C. The "MD.mac" text file, when the program finishes running, uses *use, MD.mac in ANSYS to implement the loading and cell property changes.

Claims

A method for detecting and analyzing the degree of deterioration of a building, characterized in that it comprises the following steps:

S1. Using ANSYS software to establish a model of the building structure, and generating load files and vibration files required for fatigue calculation according to the fatigue design conditions and specifications of the building;

S2, starting the ANSYS-MATLAB interface, checking the validity of the input file of the ANSYS software, calling the ANSYS software to perform the coupling analysis under the combined action of load and vibration, and obtaining the building under the combined action of the load and the vibration Structural reaction

S3, specifying a calculation type of the MATLAB software in the ANSYS-MATLAB interface, reading the ANSYS software result file, and generating a load file and a calculation file required for the calculation of the MATLAB software according to the specified analysis type, and storing Working folder

S4, establishing a simplified overall structural model of the building in the MATLAB software, reading a fatigue load file and a calculation file generated by the ANSYS-MATLAB interface, performing analysis of the strength degradation degree of the building, and obtaining the load The equivalent static load under the combined action of the vibration is calculated by the formula 1:

Where V 0 is the equivalent static load under the combined action of load and vibration, V is the static load under the load alone, i is the i-th layer in the building, n is the building The total number of layers, x i refers to the transverse vibration interference coefficient of the i-th layer in the building, and y i refers to the longitudinal vibration interference coefficient of the i-th layer in the building, and the x i is greater than 0 and less than a rational number of 1, the y i is a rational number greater than 0 and less than 1, and α is a joint enhanced interference coefficient, and the α is a rational number greater than 0 and less than 1;

S5, the step S4 described specifically includes the following modeling and calculation steps:

a simplification model of the overall structure of the building is established in the MATLAB software, and the upper structure of the building is simplified to a node mass acting on its centroid position;

b. Based on the fatigue load design, the fatigue control load and the pile-soil nonlinear model of the return period are used to obtain the basic linear stiffness matrix;

c. Based on the overall structure of the building in step a, simplify the model and the basic linear stiffness matrix in step b, and simultaneously apply the fatigue load and the calculation parameter setting file obtained by the building analysis to carry out the building load And the overall structural response analysis of the building under the combined action of the shock loads;

d. Based on the overall structural reaction analysis, obtain the equivalent stress of each key node of the structure, and set the analysis file of the intensity degradation degree, and carry out the structural fatigue calculation under the combined load and vibration conditions;

e. Read the multi-case parallel calculation file generated by the interface, and perform parallel calculation of multiple working conditions;

S6. According to the load-strength curve, the degree of structural strength degradation under the combined action of different design loads and corresponding shock loads is obtained;

S7. Obtain a degree of long-term strength degradation of the structure of the building according to an embrittlement criterion of the building structure;

S8. The building strength degradation degree analysis model based on a semi-integral method;

S9, using the ANSYS software to establish a finite element model of the building infrastructure, and outputting a quality and stiffness matrix of the infrastructure;

S10, using the basic calculation program, reading the basic structure quality and stiffness matrix in step S9, performing polycondensation, and obtaining the building basic model matrix;

S11. The building model is established in the ANSYS software based on a model matrix in S10, and a load file required for fatigue calculation is generated according to a fatigue design working condition and a specification of the building specification;

S12, starting the ANSYS-MATLAB interface, first checking the validity of the ANSYS software input file, calling the ANSYS software to carry out structural reaction analysis under load, and obtaining a structural reaction under load;

S13. Specify a calculation type of the MATLAB software in the ANSYS-MATLAB interface, read the ANSYS software result file, and generate a building load and a calculation file at the bottom of the belonging building required for the calculation according to the specified analysis type. , stored in the working folder;

S14. Establish the building infrastructure model in the MATLAB software, read the building load file and the calculation file in step S13, generate a random wave according to the vibration component of the design vibration component, and develop the building. The basic structural response analysis of the building is carried out under the combined action of load and shock loads to obtain the equivalent static load of the foundation structure;

S15. The basic structural finite element model in the MATLAB software described in step S15 is based on a fatigue control load and a pile-soil nonlinear model to obtain a basic linear stiffness matrix;

S16. Using a load-strength curve to obtain a degree of degradation of the strength of the building foundation under the combined action of different design loads and vibration elements;

S17. Obtain a degree of long-term strength degradation of the building infrastructure under the load and vibration according to the building embrittlement criterion.