CN113094793A - Wave selection and efficient design method and system for seismic isolation and reduction structure - Google Patents
Wave selection and efficient design method and system for seismic isolation and reduction structure Download PDFInfo
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Abstract
The invention discloses a wave selection and efficient design system for an earthquake reduction and isolation structure. The system comprises: establishing a seismic wave database; primarily arranging an earthquake reduction and isolation scheme, and calculating the cycle extension or additional damping ratio of the earthquake reduction and isolation structure; determining a standard design spectrum of a certain site; preferably selecting seismic waves in a seismic wave database according to a multi-band control method; the system calculates the fitting degree of the standard design spectrum and the seismic wave response spectrum; designing a reaction spectrum by combining fortification and rare earthquakes, and evaluating the effect of the seismic isolation and reduction scheme by multiple indexes of the system; modifying the scheme according to the evaluation result until the system evaluation requirement is met; carrying out shock absorption and isolation analysis verification of finite element software; and (5) completing seismic isolation design. The invention realizes an efficient seismic isolation and reduction design method, integrates a design analysis evaluation system, realizes an integrated operation process, greatly improves the calculation analysis efficiency, reduces the repeated iteration times in the seismic isolation and reduction design process, and is suitable for popularization and application of efficient seismic isolation and reduction design in various regions.
Description
Technical Field
The invention relates to a wave selection and efficient design method and system for an earthquake reduction and isolation structure, and belongs to the field of earthquake reduction and isolation structure design in the field of civil engineering.
Background
When the seismic isolation design is adopted, time-course analysis is an essential link, and reasonable seismic motion input suitable for site conditions is a precondition for carrying out structural time-course analysis. The method is characterized in that various scholars develop research on seismic motion selection of time course analysis and provide various wave selection methods, and the application degree of the seismic motion is judged according to the structural bottom shear force calculation result obtained by elastic time course analysis and vibration mode decomposition reaction spectroscopy and the seismic influence coefficient curve in the existing 'architectural earthquake design specification' in the selection of the seismic motion in China. The calculation method has large calculation amount, particularly for super high-rise structures and complex structures, and for seismic isolation and reduction structures, the seismic oscillation obtained by the seismic isolation structure is not suitable for the seismic oscillation after the seismic isolation and reduction design due to the change of the structural period after the design. Meanwhile, FEMA P695, namely the quantitative of Building Seismic Performance, adopts variance control, considers site Seismic environment characteristic elements to select Seismic waves, can implement variance control according to a structure multi-order vibration mode period to obtain required Seismic waves, but has low fitting degree of a Seismic wave reaction spectrum and a standard design spectrum due to small control limit, and reduces wave selection efficiency.
On the other hand, the existing "building earthquake-proof design code" stipulates that a time-course analysis method is adopted to carry out calculation design under general conditions, and when carrying out earthquake-proof design, the requirement on the arrangement of an earthquake-proof layer is met, the requirement on the target damping coefficient under the action of a fortification earthquake is met, and under the action of a rare earthquake, indexes such as the tensile and compressive stress of a support, the displacement of the earthquake-proof layer and the like are required to be verified. Therefore, when the defense earthquake checking calculation and the rare earthquake checking calculation are carried out, as long as one index does not meet the requirement, the shock insulation arrangement scheme needs to be readjusted, repeated iteration checking calculation is carried out, and when the model is large, the calculation time is long, and the shock insulation design efficiency is greatly reduced.
Therefore, the existing seismic oscillation selection method specified by the specification and the seismic isolation design analysis method have improvements, and meanwhile, the traditional seismic isolation design method has the problems of long calculation time, more iteration times, low calculation efficiency of seismic isolation design and the like.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a method and a system for wave selection and efficient design of an earthquake reduction and isolation structure.
The invention provides the following technical scheme:
a method and a system for wave selection and efficient design of an earthquake reduction and isolation structure comprise the following steps:
(1) establishing a seismic wave database;
(2) primarily arranging an earthquake reduction and isolation scheme, and calculating the cycle extension and the additional damping ratio of the earthquake reduction and isolation structure;
(3) determining a site standard design spectrum of a specific area according to the existing national earthquake resistance standard;
(4) preferably selecting seismic waves in a seismic wave database according to a multi-band control method;
(5) according to the period points, the system calculates the fitting degree of the standard design spectrum and the seismic wave reaction spectrum;
(6) designing a reaction spectrum by combining fortification and rare earthquakes, and evaluating the effect of the seismic isolation and reduction scheme by multiple indexes of the system;
(7) modifying the scheme according to the evaluation result until the system evaluation requirement is met;
(8) and carrying out finite element software seismic isolation analysis and verification to complete seismic isolation design.
Preferably, the seismic wave database of step (1) is suitable for specific field seismic wave alternatives of each region.
Preferably, the preliminary calculation in the step (2) requires an engineer to preliminarily arrange an earthquake reduction and isolation scheme according to the existing structural model to obtain an equivalent damping ratio of the period after preliminary calculation of earthquake reduction and isolation and the damping structure, and the equivalent damping ratio is used as a wave selection control point by combining the dynamic characteristics of the structure before earthquake reduction and isolation.
Preferably, the multi-band control method in the step (4) considers the periodic distribution of the structural vibration mode of finite element analysis according to the calculation precision requirement and the preliminary calculation result of seismic isolation and reduction, and sets a plurality of band controls by combining the wave selection control points in the step (2), and requires that the difference between the mean value of the selected seismic record acceleration spectrum in the band and the design reaction spectrum is not more than 20%.
Preferably, the fitting degree in the step (5) requires that the difference between the periodic points of the main vibration modes before and after seismic isolation and reduction of the structure is not more than 20%, and meets the requirement that the specification is consistent in statistical sense.
Preferably, the multi-index evaluation in the step (6) is based on the standard acceleration response spectrum and the standard displacement response spectrum, the seismic isolation structure comprises spectrum seismic isolation coefficient evaluation under the action of a protected earthquake and spectrum seismic isolation layer displacement evaluation under the action of a rare earthquake, and the shock absorption structure comprises spectrum seismic mitigation displacement evaluation under the action of a multiple earthquake, spectrum seismic mitigation coefficient evaluation under the action of a protected earthquake and spectrum seismic mitigation displacement evaluation under the action of a rare earthquake.
Preferably, the modified seismic isolation and reduction scheme in the step (7), namely the iteration part of the system, replaces the repeated iteration of the traditional seismic isolation and reduction design, wherein the calculation of the fortification earthquake or the rare earthquake does not meet the standard requirement, and the calculation efficiency is greatly improved; based on the super-computation center, the system can transfer the iteration part to the finite element analysis so as to improve the computation accuracy.
Preferably, the finite element seismic mitigation and isolation analysis verification in the step (8) is numerical analysis under the action of a defense earthquake and a rare earthquake, and the analysis does not need repeated iteration and only needs to be used as numerical simulation verification because the analysis passes multi-index analysis.
The wave selection and efficient design method and system for the seismic isolation and reduction structure have the following beneficial effects:
(1) according to the method and the system for wave selection and efficient design of the seismic isolation structure, the seismic waves suitable for the seismic isolation structure are efficiently and accurately selected based on the established seismic wave database according to the dynamic characteristics of the structures before and after seismic isolation, and the problems of inaccurate wave selection, long time consumption and the like are solved.
(2) According to the method and the system for wave selection and efficient design of the seismic isolation and reduction structure, the spectrum is designed based on the fortification earthquake and rare earthquake specifications, the spectrum comprises an acceleration reaction spectrum and a displacement reaction spectrum, multi-index evaluation such as spectrum seismic isolation and reduction coefficient evaluation and spectrum seismic isolation and reduction displacement evaluation is carried out, the seismic isolation and reduction design scheme is determined efficiently, and a theoretical basis is provided for the primary design of the structure.
(3) According to the wave selection and efficient design method and system for the seismic isolation and reduction structure, the iterative part of the system is adopted to replace the iterative iteration that the calculation of the fortification earthquake or rare earthquake in the traditional seismic isolation and reduction design does not meet the standard requirement, the calculation efficiency is greatly improved, the method and system are suitable for various structural designs, the work of an ultrahigh-performance computer is not needed, and only the current finite element analysis verification needs to be carried out.
(4) According to the wave selection and efficient design method and system for the seismic isolation structure, modification of the seismic isolation and reduction scheme, namely the iterative part of the system, can be carried out after finite element analysis based on the supercomputing center, and therefore the calculation accuracy is further improved.
(5) According to the method and the system for wave selection and efficient design of the seismic isolation and reduction structure, the integrated operation process of wave selection, design and calculation is realized, the applicability of seismic wave selection is optimized, the efficiency of seismic isolation and reduction analysis is improved, and the method and the system are suitable for popularization and application of efficient seismic isolation and reduction design in various regions.
Drawings
FIG. 1 is a schematic diagram of a calculation layout of a first embodiment of a method and a system for wave selection and efficient design of an earthquake reduction and isolation structure according to the present invention;
FIG. 2 is a schematic diagram of the calculation layout of a second embodiment of the method and system for wave selection and efficient design of seismic isolation and reduction structures of the present invention;
FIG. 3 is a diagram illustrating the acceleration response spectrum evaluation under the seismic action of seismic fortification in seismic isolation analysis specifications;
FIG. 4 is a diagram illustrating the evaluation of displacement response spectra under the action of rare earthquakes in seismic isolation analysis specifications;
FIG. 5 is a graph illustrating the evaluation of the displacement response spectrum under the action of multi-earthquake in the damping analysis specification
FIG. 6 is an acceleration response spectrum evaluation under the action of a damping analysis specification fortification earthquake;
FIG. 7 is a diagram illustrating the evaluation of displacement response spectra under the action of rare earthquakes in the shock absorption analysis specification.
Detailed Description
The invention is further illustrated by the following examples and figures.
The invention discloses a wave selection and efficient design system for an earthquake reduction and isolation structure. The system comprises: establishing a seismic wave database; primarily arranging an earthquake reduction and isolation scheme, and calculating the cycle extension and the additional damping ratio of the earthquake reduction and isolation structure; determining a standard design spectrum of a certain site; preferably selecting seismic waves in a seismic wave database according to a multi-band control method; the system calculates the fitting degree of the standard design spectrum and the seismic wave response spectrum; designing a reaction spectrum by combining fortification and rare earthquakes, and evaluating the effect of the seismic isolation and reduction scheme by multiple indexes of the system; modifying the scheme according to the evaluation result until the system evaluation requirement is met; carrying out shock absorption and isolation analysis verification of finite element software; and (5) completing seismic isolation design. The invention realizes an efficient seismic isolation and reduction design method, provides a design analysis evaluation system, realizes an integrated operation process, improves the calculation analysis efficiency, reduces the repeated iteration times in the seismic isolation and reduction design process, and is suitable for popularization and application of efficient seismic isolation and reduction design in various regions.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Example 1:
see fig. 1, 3, 4, 5, and 6 for example only.
As shown in fig. 1, a method and a system for wave selection and efficient design of an earthquake reduction and isolation structure comprise the following steps:
(1) establishing a seismic wave database;
(2) primarily arranging an earthquake reduction and isolation scheme, and calculating the cycle extension and the additional damping ratio of the earthquake reduction and isolation structure;
(3) determining a site standard design spectrum of a specific area according to the existing national earthquake resistance standard;
(4) preferably selecting seismic waves in a seismic wave database according to a multi-band control method;
(5) according to the period points, the system calculates the fitting degree of the standard design spectrum and the seismic wave reaction spectrum;
(6) designing a reaction spectrum by combining fortification and rare earthquakes, and evaluating the effect of the seismic isolation and reduction scheme by multiple indexes of the system;
(7) modifying the scheme according to the evaluation result until the system evaluation requirement is met;
(8) and carrying out finite element software seismic isolation analysis and verification to complete seismic isolation design.
The seismic wave database of the step (1) is suitable for specific field seismic wave alternatives of each region.
The preliminary calculation of the step (2) requires an engineer to preliminarily arrange an earthquake reduction and isolation scheme according to the existing structural model to obtain the equivalent damping ratio of the period after preliminary calculation of earthquake reduction and isolation and the damping structure, and the equivalent damping ratio is used as a wave selection control point by combining the dynamic characteristics of the structure before earthquake reduction and isolation.
And (3) setting a plurality of frequency band controls by taking finite element analysis structural vibration mode period distribution into consideration according to the calculation precision requirement and the seismic isolation primary calculation result and combining the wave selection control points in the step (2) by the multi-frequency band control method in the step (4), wherein the difference between the average value of the selected seismic record acceleration spectrum in the section and the design reaction spectrum is required to be not more than 20%.
The fitting degree of the step (5) requires that the difference between the periodic points of the main vibration modes before and after seismic isolation and reduction of the structure is not more than 20 percent, and meets the requirement that the specification is consistent in statistical significance.
And (4) evaluating the multiple indexes in the step (6) based on a standard acceleration response spectrum and a standard displacement response spectrum.
Referring to fig. 3 and 4, for the seismic isolation structure, the evaluation of the spectral isolation coefficient under the action of a defensed earthquake and the evaluation of the spectral isolation layer displacement under the action of a rare earthquake are included, and the spectral isolation coefficient (R) is set as an example in fig. 31) Hehan symphysis spectrum seismic isolation layer displacement (R)2) The following equations are respectively calculated, wherein Sa represents: acceleration response spectrum values; sd denotes: shift the reaction spectrum value.
The fortification spectrum seismic isolation coefficient is used for evaluating a seismic isolation target under the action of a fortification earthquake, namely an upper structure gradient target; and the rare spectrum shock insulation layer displacement is used for checking and calculating the displacement of the shock insulation layer under the action of rare earthquakes and designing a shock insulation groove.
Referring to fig. 5 and 6, the damping structure includes the evaluation of spectral damping displacement under the action of multi-earthquake, the evaluation of spectral damping coefficient under the action of fortifying earthquake, and the evaluation of spectral damping displacement under the action of rare earthquake, taking fig. 3 as an example to evaluate the spectral damping displacement (R)3) Set spectrum damping coefficient (R)4) Hehan symphysis spectrum seismic isolation layer displacement (R)5) The following formula is calculated, respectively:
the multi-spectrum damping displacement is used for evaluating a damping target under the action of an earthquake, and then the equivalent damping ratio of the upper structure is evaluated; the fortification spectrum damping coefficient is used for evaluating the acceleration damping effect of the upper structure under the action of fortification earthquake; and the rare encounter spectrum damping displacement is used for verifying and calculating the damping effect of the displacement of the upper structure under the action of the rare encounter earthquake.
The modified seismic isolation and reduction scheme in the step (7) is an iteration part of the system, and replaces repeated iteration that the calculation of a fortification earthquake or a rare earthquake in the traditional seismic isolation and reduction design does not meet the standard requirement, so that the calculation efficiency is greatly improved, the system is suitable for various structural designs, and the system does not need an ultrahigh-performance computer to carry out work and only needs to carry out the current finite element analysis verification.
The finite element seismic mitigation and isolation analysis verification in the step (8) is numerical analysis under the action of a fortification earthquake and a rare earthquake, and the analysis does not need repeated iteration and only needs to be used as numerical simulation verification because the model passes multi-index analysis.
Example 2:
see fig. 2 for example only.
As shown in fig. 1, a method and a system for wave selection and efficient design of an earthquake reduction and isolation structure comprise the following steps:
(1) establishing a seismic wave database;
(2) primarily arranging an earthquake reduction and isolation scheme, and calculating the cycle extension and the additional damping ratio of the earthquake reduction and isolation structure;
(3) determining a site standard design spectrum of a specific area according to the existing national earthquake resistance standard;
(4) preferably selecting seismic waves in a seismic wave database according to a multi-band control method;
(5) according to the period points, the system calculates the fitting degree of the standard design spectrum and the seismic wave reaction spectrum;
(6) based on the supercomputing server, developing finite element software seismic mitigation and isolation analysis, and modifying an iterative design scheme according to a finite element result until the requirement of a system finite element control index is met;
(7) and (5) completing seismic isolation design.
The seismic wave database of the step (1) is suitable for specific field seismic wave alternatives of each region.
The preliminary calculation of the step (2) requires an engineer to preliminarily arrange an earthquake reduction and isolation scheme according to the existing structural model to obtain the equivalent damping ratio of the period after preliminary calculation of earthquake reduction and isolation and the damping structure, and the equivalent damping ratio is used as a wave selection control point by combining the dynamic characteristics of the structure before earthquake reduction and isolation.
And (3) setting a plurality of frequency band controls by taking finite element analysis structural vibration mode period distribution into consideration according to the calculation precision requirement and the seismic isolation primary calculation result and combining the wave selection control points in the step (2) by the multi-frequency band control method in the step (4), wherein the difference between the average value of the selected seismic record acceleration spectrum in the section and the design reaction spectrum is required to be not more than 20%.
The fitting degree of the step (5) requires that the difference between the periodic points of the main vibration modes before and after seismic isolation and reduction of the structure is not more than 20 percent, and meets the requirement that the specification is consistent in statistical significance.
The finite element software seismic isolation and reduction analysis in the step (6) is carried out, based on a supercomputing center server, the calculation efficiency is improved through hardware measures, the iterative design scheme, namely the iterative part of the system, is modified, namely the repeated iteration that the design of the seismic isolation and reduction design and the calculation of the earthquake which is rarely met and does not meet the standard requirement is carried out, based on the supercomputing center server, the calculation efficiency can also be greatly improved, the system is suitable for various structural designs, but the hardware requirement is higher.
The above are typical examples of the present invention, and the practice of the present invention is not limited thereto.
The above description is only illustrative of the preferred embodiments of the present invention and should not be taken as limiting the scope of the invention in any way. Any changes or modifications made by those skilled in the art based on the above disclosure should be considered as equivalent effective embodiments, and all the changes or modifications should fall within the protection scope of the technical solution of the present invention.
Claims (8)
1. A method and a system for wave selection and efficient design of an earthquake reduction and isolation structure are characterized by comprising the following steps:
1) establishing a seismic wave database;
2) primarily arranging an earthquake reduction and isolation scheme, and calculating the cycle extension and the additional damping ratio of the earthquake reduction and isolation structure;
3) determining a site standard design spectrum of a specific area according to the existing national earthquake resistance standard;
4) preferably selecting seismic waves in a seismic wave database according to a multi-band control method;
5) according to the period points, the system calculates the fitting degree of the standard design spectrum and the seismic wave reaction spectrum;
6) designing a reaction spectrum by combining fortification and rare earthquakes, and evaluating the effect of the seismic isolation and reduction scheme by multiple indexes of the system;
7) modifying the scheme according to the evaluation result until the system evaluation requirement is met;
8) and carrying out finite element software seismic isolation analysis and verification to complete seismic isolation design.
2. The method and the system for wave selection and efficient design of the seismic isolation structure according to claim 1, wherein the method comprises the following steps: the seismic wave database of the step 1) is suitable for seismic wave alternatives of specific fields of various regions.
3. The method and the system for wave selection and efficient design of the seismic isolation structure according to claim 1, wherein the method comprises the following steps: the preliminary calculation of the step 2) requires an engineer to preliminarily arrange an earthquake reduction and isolation scheme according to the existing structural model to obtain the equivalent damping ratio of the period after preliminary calculation of earthquake reduction and isolation and the equivalent damping ratio of the earthquake reduction and isolation structure, and the equivalent damping ratio is used as a wave selection control point by combining the dynamic characteristics of the structure before earthquake reduction and isolation.
4. The method and the system for wave selection and efficient design of the seismic isolation structure according to claim 1, wherein the method comprises the following steps: the multi-band control method in the step 4) considers the periodic distribution of the structural vibration mode of finite element analysis according to the calculation precision requirement and the initial calculation result of seismic isolation and reduction, and sets a plurality of frequency band controls by combining the wave selection control points in the step 2), and requires that the difference between the average value of the selected seismic record acceleration spectrum in the section and the design reaction spectrum is not more than 20%.
5. The method and the system for wave selection and efficient design of the seismic isolation structure according to claim 1, wherein the method comprises the following steps: the fitting degree of the step 5) requires that the difference between the periodic points of the main vibration modes before and after seismic isolation and reduction of the structure is not more than 20 percent, and meets the requirement of the specification on conformity in statistical significance.
6. The method and the system for wave selection and efficient design of the seismic isolation structure according to claim 1, wherein the method comprises the following steps: the multi-index evaluation in the step 6) is based on the standard acceleration response spectrum and the standard displacement response spectrum, the vibration isolation structure comprises spectrum vibration isolation coefficient evaluation under the action of a fortifying earthquake and spectrum vibration isolation layer displacement evaluation under the action of a rare earthquake, and the vibration absorption structure comprises spectrum vibration reduction displacement evaluation under the action of a multi-chance earthquake, spectrum vibration reduction coefficient evaluation under the action of a fortifying earthquake and spectrum vibration reduction displacement evaluation under the action of a rare earthquake.
7. The method and the system for wave selection and efficient design of the seismic isolation structure according to claim 1, wherein the method comprises the following steps: the modified seismic isolation and reduction scheme in the step 7), namely the iterative part of the system, replaces the repeated iteration that the calculation of the fortification earthquake or rare earthquake in the traditional seismic isolation and reduction design does not meet the standard requirement, and the calculation efficiency is greatly improved; based on the super-computation center, the system can transfer the iteration part to the finite element analysis so as to improve the computation accuracy.
8. The method and the system for wave selection and efficient design of the seismic isolation structure according to claim 1, wherein the method comprises the following steps: the finite element seismic mitigation and isolation analysis verification in the step 8) is numerical analysis under the action of a fortification earthquake and a rare earthquake, and the analysis does not need repeated iteration and only needs to be used as numerical simulation verification because the analysis passes multi-index analysis.
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