WO2021046849A1

WO2021046849A1 - Seismic optimization method for building supports and hangers

Info

Publication number: WO2021046849A1
Application number: PCT/CN2019/105841
Authority: WO
Inventors: 丁幼亮; 丁李
Original assignee: 南京东南建筑机电抗震研究院有限公司
Priority date: 2019-09-14
Filing date: 2019-09-14
Publication date: 2021-03-18

Abstract

The present invention provides a seismic optimization method for building supports and hangers, comprising the following steps: computer design of seismic supports and hangers; building a three-dimensional spatial analysis model for seismic supports and hangers on the basis of a building structure-computer design; and optimizing seismic supports and hangers structure. The seismic optimization method for building supports and hangers provided by the present invention utilizes, after the computer design of seismic supports and hangers, the three-dimensional spatial analysis model for seismic supports and hangers on the basis of the building structure-computer design to form several optimization solutions, and then selects an optimal combination type from different combination types through the maximum quality and cost of electromechanical pipelines borne by the seismic supports and hangers corresponding to each different combination type, the design method is reasonable and is suitable for engineering applications.

Description

A seismic optimization method for building supports and hangers

Technical field

The invention relates to the field of building seismic resistance, in particular to a seismic optimization method of a building support and hanger.

Background technique

With the development of my country's construction industry and the contraction of land use, in order to shorten the project period, intensive and efficient construction of multiple buildings has become the norm in the civil engineering industry. As an important role in the construction field, tower cranes have an increasingly complex operating environment. However, traditional hoisting operations use the cooperation of operators and hoisting personnel to direct the overlapping operations of the tower cranes. Although these professionals need to obtain a relevant driver's license and have a certain level of education to be able to work, this method is generally less intelligent, and the information is not accurate or timely, and it is difficult to deal with some complex situations. In recent years, the high incidence of tower crane collision accidents has gradually confirmed this. Traditional monitoring technology that relies on manual duty gradually cannot meet the anti-collision warning requirements of tower cranes on modern construction sites. There is an urgent need for a type of building that can monitor the hoisting operation of tower cranes in real time and can send out early warning signals. Support and hanger design method.

Summary of the invention

technical problem

In order to solve the shortcomings of the prior art, the present invention provides a seismic optimization method for a building support and hanger.

The solution to the problem

Technical solutions

The seismic optimization method of a building support and hanger provided by the present invention includes the following steps:

(1) Seismic support and hanger computer design: establish seismic support and hanger database; load optimization program in CAD; identify pipe diameter; specifically: manually pick up the operating layer, optimize program to automatically identify and screen pipe diameter; seismic support hanger Frame layout design: automatic matching; generate a list of the number of seismic supports and hangers; generate calculation sheets and large-scale drawings;

(2) Establish a three-dimensional space analysis model of the building structure-computer-designed seismic support and hanger: select the maximum distance of the seismic support and hanger and the minimum cross-sectional area of the diagonal brace to calculate the maximum acceleration response of the seismic support and hanger; calculate the building structure Floor response spectrum, and modify the floor response spectrum according to the maximum acceleration response to obtain the modified floor response spectrum; according to the modified floor response spectrum, establish the maximum acceleration response of seismic supports and hangers, the distance between supports and hangers, and the cross-sectional area of diagonal supports The quadratic polynomial regression model between the two; determine the optimal design value of the seismic support and hanger spacing and the diagonal brace section area, and form several optimized seismic support and hanger schemes;

(3) Seismic support and hanger structure optimization: The calculation of each optimized seismic support and hanger scheme is converted into the maximum mass that can withstand the electromechanical pipeline; according to the type and quality of the electromechanical pipeline, the seismic support corresponding to each different combination type The hanger can withstand the maximum quality and cost of the electromechanical pipeline, and the optimal combination type is selected from the different combination types.

In step (1), the seismic support and hanger database includes a design parameter database and an EXCEL material database, wherein the design parameter database includes earthquake seismic fortification intensity levels, calculation formulas in the equivalent lateral force method in GB50981, site impact data, Earthquake impact data, seismic fortification intensity and design seismic acceleration value correspondence, design characteristic period value, seismic action calculation, construction category coefficient and function coefficient of building electromechanical equipment.

Step (2) specifically: Determine the maximum spacing of seismic supports and hangers according to the "Code for Seismic Design of Building Electrical and Mechanical Engineering", and calculate the quality of the seismic support and hanger single-mass point calculation model according to the linear mass density of the pipeline, and the single-mass point calculation model The lateral stiffness is calculated according to the minimum cross-sectional area of the seismic support and hanger diagonal bracing product; the mode superposition time history analysis method is used to calculate the maximum acceleration response a1 of the seismic support and hanger when the seismic wave is input, and the mode shape superimposition time history analysis method is used The selection of the quantity is determined according to the following method: according to the "Code for Seismic Design of Buildings", the mass coefficient of the mode participation is not less than 90% to determine the mode number m, and the basic natural vibration period T0 is calculated according to the single-mass point calculation model of the seismic support and hanger. This determines the lowest mode order and the corresponding mode number n according to T0, and selects the larger value of m and n as the final mode number

Step (2) is specifically: for the three-dimensional space analysis model of the building structure when the seismic supports and hangers are not installed, the mode superposition time history analysis method is used to calculate the acceleration time history response at the center of the floor plan when the seismic wave is input; according to the center of the floor plan Calculate the floor response spectrum based on the acceleration time history response at the location; calculate the maximum acceleration response a2 of the seismic support and hanger according to the floor response spectrum and the basic natural vibration period T0 of the single particle calculation model of the seismic support and hanger; according to the maximum acceleration response a2 and steps 2.2 Obtain the maximum acceleration response a1, calculate the acceleration amplitude modulation coefficient β=a1/a2; multiply the floor response spectrum by the acceleration amplitude modulation coefficient β to obtain a modified floor response spectrum suitable for seismic calculation of seismic supports and hangers.

Step (2) specifically: Determine the design value range of the seismic support and hanger spacing and diagonal brace section area, and use uniform sampling to generate design sample points for the support and hanger spacing and diagonal brace cross-sectional area; design according to the spacing of supports and hangers Calculate the design sample point of the single-mass point of the seismic support and hanger according to the linear mass density of the sample points and the pipeline; determine the design sample point of the lateral stiffness of the seismic support and hanger according to the cross-sectional area of the diagonal brace; according to the quality and side of the single-mass point of the seismic support and hanger Calculate the basic natural vibration period of the single particle calculation model, and calculate the maximum acceleration response a of the corresponding support and hanger based on the modified floor response spectrum. The design sample points and lateral stiffness of the single particle mass of all seismic supports and hangers are calculated. Design sample points for calculation, establish a quadratic polynomial regression model between the maximum acceleration response a of the seismic support and hanger, the distance between the support and the hanger, and the cross-sectional area of the diagonal brace. The regression model parameters are calculated by the least square method.

Step (2) is specifically as follows: the seismic action of the seismic support and hanger is calculated from the maximum acceleration response a, the spacing between the supports and hangers and the linear mass density of the pipeline. Based on this, the seismic action and the seismic action of the seismic support and hanger are established according to the quadratic polynomial regression model. A quadratic polynomial regression model between the spacing of supports and hangers and the cross-sectional area of diagonal braces; the axial stress of seismic supports and hangers under earthquake action is used as the bearing capacity parameter, and the amount of steel used for seismic supports and hangers is the least As the objective function and the constraint condition that the axial stress of the diagonal brace is less than the yield strength of the steel, the non-linear least square algorithm is used to determine the optimal design value of the seismic support and hanger spacing and the cross-sectional area of the diagonal brace.

The beneficial effects of the invention

Beneficial effect

The earthquake-resistant optimization method of the building support and hanger provided by the present invention is designed by computer after the earthquake-resistant support and hanger is designed, and then the three-dimensional space analysis model of the seismic support and hanger designed by the building structure-computer is used to form several optimization schemes. The seismic support and hanger can withstand the maximum quality and cost of electromechanical pipelines. The optimal combination type is selected from different combination types, the design method is reasonable, and it is suitable for engineering applications.

Invention embodiment

detailed description

The specific implementation of the present invention will be described in further detail below in conjunction with examples. The following examples are used to illustrate the present invention, but not to limit the scope of the present invention.

The seismic optimization method of building supports and hangers includes the following steps:

The seismic support and hanger database includes a design parameter database and an EXCEL material database, wherein the design parameter database includes seismic fortification intensity level, calculation formula in equivalent lateral force method in GB50981, site impact data, earthquake impact data, seismic fortification Correspondence between intensity and design seismic acceleration value, design characteristic period value, seismic action calculation, construction category coefficient and function coefficient of building electromechanical equipment.

Determine the maximum spacing of seismic supports and hangers according to the "Code for Seismic Design of Building Electrical and Mechanical Engineering", and calculate the quality of the single-particle calculation model of the seismic supports and hangers according to the linear mass density of the pipeline. The lateral stiffness of the single-particle calculation model is based on the seismic support The calculation of the minimum cross-sectional area of the hanger diagonal brace product; the mode superposition time history analysis method is used to calculate the maximum acceleration response a1 of the seismic support and hanger when the seismic wave is input. The number of modes in the mode superposition time history analysis method is selected according to the following method Confirmation: Determine the number of modes m according to the "Code for Seismic Design of Buildings" with a mass coefficient of not less than 90%, and calculate the basic natural vibration period T0 according to the single-mass point calculation model of the seismic support and hanger, and determine the lowest mode according to T0. The order and the corresponding number of modes n, choose the larger value of m and n as the final number of modes

For the three-dimensional space analysis model of the building structure when no seismic supports are installed, the mode superposition time history analysis method is used to calculate the acceleration time history response at the center of the floor plan when seismic waves are input; the acceleration time history response at the center of the floor plan is calculated based on the acceleration time history response at the center of the floor plan. Floor response spectrum; According to the basic natural vibration period T0 of the floor response spectrum and the single particle calculation model of the seismic support and hanger, the maximum acceleration response a2 of the seismic support and hanger is obtained; the maximum acceleration response a1 obtained according to the maximum acceleration response a2 and step 2.2 Calculate the acceleration amplitude modulation coefficient β=a1/a2; multiply the floor response spectrum by the acceleration amplitude modulation coefficient β to obtain a modified floor response spectrum suitable for seismic calculation of seismic supports and hangers.

Determine the design value range of the seismic support and hanger spacing and diagonal brace section area, and use the uniform sampling method to generate design sample points for the support and hanger spacing and diagonal brace cross-sectional area; design sample points based on the spacing between supports and hangers and the line quality of the pipeline Density calculation of seismic support and hanger single-mass design sample point; according to the diagonal brace section area to determine the design sample point of the seismic support and hanger lateral stiffness; according to the seismic support and hanger single-mass and lateral stiffness, calculate the single-mass point calculation The basic natural vibration period of the model, and the maximum acceleration response a of the corresponding support and hanger is calculated according to the modified floor response spectrum, and the design sample points of the single-mass point and the design sample points of the lateral stiffness of all seismic supports and hangers are calculated to establish A quadratic polynomial regression model between the maximum acceleration response a of the seismic support and hanger, the distance between the support and the hanger, and the cross-sectional area of the diagonal brace. The regression model parameters are calculated by the least square method.

The seismic action of the seismic support and hanger is calculated from the maximum acceleration response a, the distance between supports and hangers and the linear mass density of the pipeline. Based on this, the seismic action of the seismic support and hanger is established according to the quadratic polynomial regression model. A quadratic polynomial regression model between the cross-sectional areas; the axial stress of the seismic support and hanger under the action of the earthquake is used as the bearing capacity parameter, and the minimum steel consumption of the seismic support and hanger is taken as the objective function. The axial stress is less than the yield strength of the steel as a constraint condition. A nonlinear least squares algorithm is used to determine the optimal design value of the seismic support and hanger spacing and diagonal brace section area.

The above-mentioned embodiments only express several embodiments of the present invention, and the description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

An anti-seismic optimization method for a building support and hanger is characterized in that it comprises the following steps:

(1) Seismic support and hanger computer design: establish seismic support and hanger database; load optimization program in CAD; identify pipe diameter; specifically: manually pick up the operating layer, optimize program to automatically identify and screen pipe diameter; seismic support hanger Frame layout design: automatic matching; generate a list of the number of seismic supports and hangers; generate calculation sheets and large-scale drawings;

(2) Establish a three-dimensional space analysis model of the building structure-computer-designed seismic support and hanger: select the maximum distance of the seismic support and hanger and the minimum cross-sectional area of the diagonal brace to calculate the maximum acceleration response of the seismic support and hanger; calculate the building structure Floor response spectrum, and modify the floor response spectrum according to the maximum acceleration response to obtain the modified floor response spectrum; according to the modified floor response spectrum, establish the maximum acceleration response of seismic supports and hangers, the distance between supports and hangers, and the cross-sectional area of diagonal supports The quadratic polynomial regression model between the two; determine the optimal design value of the seismic support and hanger spacing and the diagonal brace section area, and form several optimized seismic support and hanger schemes;

(3) Seismic support and hanger structure optimization: The calculation of each optimized seismic support and hanger scheme is converted into the maximum mass that can withstand the electromechanical pipeline; according to the type and quality of the electromechanical pipeline, the seismic support corresponding to each different combination type The hanger can withstand the maximum quality and cost of the electromechanical pipeline, and the optimal combination type is selected from the different combination types.
The seismic optimization method of a building support and hanger according to claim 1, wherein in step (1), the seismic support and hanger database includes a design parameter database and an EXCEL material database, wherein the design parameter database includes Earthquake fortification intensity level, calculation formula in equivalent lateral force method in GB50981, site impact data, earthquake impact data, correspondence between seismic fortification intensity and design seismic acceleration value, design characteristic period value, earthquake action calculation, construction category of building electromechanical equipment Coefficients and functional coefficients.
The seismic optimization method for building supports and hangers according to claim 1, characterized in that: step (2) is specifically: determining the maximum spacing of seismic supports and hangers according to the "Code for Seismic Design of Building Electromechanical Engineering", and according to The linear mass density of the pipeline calculates the quality of the single-mass point calculation model of the seismic support and hanger, and the lateral stiffness of the single-mass calculation model is calculated according to the minimum cross-sectional area of the seismic support and hanger diagonal bracing product; the seismic wave input is calculated by the mode superposition time history analysis method The maximum acceleration response a1 of the anti-seismic support and hanger at the time, the selection of the number of modes in the mode superposition time history analysis method is determined according to the following method: According to the "Code for Seismic Design of Buildings", the mode participation quality factor is not less than 90% to determine the vibration According to the single-mass point calculation model of the seismic support and hanger, the basic natural vibration period T0 is calculated according to the number of modes m. According to this, the lowest mode order and the corresponding mode number n are determined according to T0, and the larger value of m and n is selected. As the final mode number.
The seismic optimization method for building supports and hangers according to claim 1, characterized in that: step (2) is specifically: for the three-dimensional space analysis model of the building structure when the seismic supports and hangers are not installed, when the mode superposition is adopted Calculate the acceleration time history response at the center of the floor plan when seismic waves are input by the time-history analysis method; calculate the floor response spectrum based on the acceleration time history response at the center of the floor plan; calculate the basic freedom of the model based on the floor response spectrum and the single particle of the earthquake support and hanger The vibration period T0 obtains the maximum acceleration response a2 of the seismic support and hanger; according to the maximum acceleration response a2 and the maximum acceleration response a1 obtained in step 2.2, calculate the acceleration amplitude modulation coefficient β = a1/a2; multiply the floor response spectrum by the acceleration amplitude modulation coefficient β , The revised floor response spectrum suitable for seismic calculation of seismic support and hanger is obtained.
The seismic optimization method for building supports and hangers according to claim 1, characterized in that: step (2) is specifically: determining the design value range of the distance between the seismic supports and hangers and the cross-sectional area of diagonal braces, and generating by uniform sampling method Design sample points for the spacing of supports and hangers and the cross-sectional area of diagonal braces; calculate the design sample points for the quality of single-mass points of seismic supports and hangers according to the design sample points of the spacing between supports and hangers and the linear mass density of the pipeline; determine the seismic supports according to the cross-sectional area of diagonal braces The design sample point of the hanger's lateral stiffness; according to the mass and lateral stiffness of the single particle of the seismic support and hanger, the basic natural vibration period of the single particle calculation model is calculated, and the maximum acceleration of the corresponding support and hanger is calculated according to the modified floor response spectrum Response a: Calculate the design sample points of the single mass point and the design sample points of the lateral stiffness of all seismic supports and hangers, and establish the relationship between the maximum acceleration response a of the seismic supports and hangers, the distance between the supports and hangers, and the cross-sectional area of diagonal braces. Quadratic polynomial regression model, the regression model parameters are calculated by the least square method.
The seismic optimization method of a building support and hanger according to claim 1, characterized in that: step (2) is specifically: the seismic action of the earthquake support and hanger is reflected by the maximum acceleration a, the distance between the supports and hangers, and the line quality of the pipeline Density calculation is obtained. According to the quadratic polynomial regression model, a quadratic polynomial regression model between the seismic action of the seismic support and hanger and the distance between the support and hanger and the cross-sectional area of the diagonal brace is established; The axial stress is taken as the bearing capacity parameter, and the minimum steel consumption of the diagonal brace of the seismic support and hanger is the objective function, and the axial stress of the diagonal brace is less than the yield strength of the steel as the constraint condition, and the non-linear least squares algorithm is used to determine the seismic support Optimized design value of frame spacing and diagonal brace section area.