75 results about "Response spectrum" patented technology

The invention relates to the technical field of road surface detection, in particular to a road surface skid resistance detection system based on multi-feature fusion, which comprises the following steps: applying broadband sweep frequency excitation by using a frequency modulation vibration sensor, matching with the inherent frequency of road surface texture to generate local resonance, and collecting the temperature, humidity and rainfall of a road surface in real time; performing fast Fourier transform on the collected vibration signals to obtain a resonance response spectrum, extracting key parameters through Gaussian fitting, and fusing frequency domain, material and environment data to form a comprehensive feature set; the frequency domain features are converted into three-dimensional energy distribution of pavement microtextures, the actual contact area ratio is calculated according to the three-dimensional energy distribution, an environment temperature and humidity compensation factor is introduced, and a dynamic friction attenuation coefficient is calculated; and comparing the calculated dynamic friction attenuation coefficient with a third-level safety threshold, and outputting a corresponding anti-skid performance level. Multi-source data fusion enables a detection result to be more fit with an actual driving scene, and misjudgment caused by single data is avoided.

Disclosed in the present invention are a method and apparatus for synthesizing spatially cross-correlated multi-point ground motions fitting a response spectrum. The method comprises: using an influence matrix method to obtain ground motion acceleration time histories fitting a target reaction spectrum with high precision, and calculating a Fourier amplitude spectrum and a phase spectrum thereof; and considering a calculation relationship between a power spectral density function and the Fourier amplitude spectrum, taking the power spectral density function of the obtained time histories as an initial value, using a random vibration theory and Cholesky decomposition to obtain spatially cross-correlated multi-point ground motion time histories, further taking into account a phase spectrum of the ground motion time histories fitting the target reaction spectrum with high precision, and performing correction and iteration to obtain spatially cross-correlated multi-point ground motions fitting a response spectrum. The present invention overcomes the shortcomings in current multi-point ground motion time history synthesis techniques, such as the difficulty in ensuring good fitting to a target response spectrum and the non-stationarity of synthesized ground motions, helping to improve the reliability of dynamic response analysis results for large-scale engineering structures under the action of multi-point ground motions.

The invention relates to a seismic oscillation fitting method matched with a multi-damping-ratio response spectrum. According to the seismic motion fitting method, the seismic geology environment of the region is classified and the feature mother wave set is constructed, so that the seismic geology features of the region can be fully considered, and the fitting result can better conform to the actual condition of the target region and is more targeted and accurate. Through combination of characteristic seismic oscillation mother wave optimization and a dynamic parameterized particle swarm optimization algorithm, aiming at nonlinear characteristics of multi-damping ratio spectrum coupling matching, an improved particle swarm optimization PSO algorithm with a self-adaptive inertia weight and a learning factor is designed, and while the multi-target response spectrum fitting precision is improved, the multi-target response spectrum fitting precision is improved. And the time-frequency non-stationary characteristic of original seismic oscillation is reserved.

The invention discloses an anti-seismic property analysis method for a wind and rain bridge body structure. By constructing a finite element model of the wind and rain bridge, the mechanical response of the wind and rain bridge under the action of static load and seismic waves is simulated. The method specifically comprises the following steps: constructing a finite element model comprising a pier, a bridge floor, a wooden support and a rubber shock insulation layer; carrying out static analysis to obtain bearing capacity, deflection and stress distribution; carrying out dynamic analysis, including modal analysis and seismic response analysis, to determine a key response spectrum; and the arrangement scheme of the rubber shock insulation layer is optimized to improve the anti-seismic performance. According to the method, through refined finite element analysis and in combination with the rubber shock insulation technology, the anti-seismic performance of the wind and rain bridge is remarkably improved, and the historical and cultural values of the wind and rain bridge are kept to the maximum extent. The method provides a scientific basis and technical support for improving the anti-seismic property of a traditional wood structure building, and has important engineering application value and culture protection significance.

The invention discloses an anti-seismic property analysis method for a complex high-rise structure. The method comprises the following steps: determining a boundary range of a super high-rise building; the anti-seismic requirement of the over-limit high-rise building is determined, the height limit is determined based on different structural forms, and it is ensured that at least one aspect of the height, the height-width ratio and the body regularity of the house meets specifications and regulations; step 3, structural finite element modeling: based on the general situation of the constructional engineering, simplifying a finite element model to enable the finite element model to be consistent with an actual structure, and establishing the finite element model; 4, analyzing dynamic characteristics of the structure, wherein the inherent dynamic performance of the structure is reflected by the similar characteristics of the structure; and step 5, structural seismic response spectrum applying: applying the seismic response spectrum to the whole structure to research the maximum response of the structure under the seismic load effect of fortification intensity. According to the anti-seismic performance analysis method for the complex high-rise structure, multiple key aspects of super high-rise building boundary range determination, clear anti-seismic design requirements, structural finite element modeling, dynamic characteristic analysis, seismic response spectrum analysis and the like are comprehensively covered, and a set of systematic and complete analysis process is formed; and the anti-seismic performance of the complex high-rise structure can be deeply and carefully analyzed.

The invention provides a rebuilt underground structure earthquake analysis method combined with a reaction acceleration method, and the method comprises the steps: building an overall structure calculation model which comprises a foundation and a soil body around an underground structure, and the overall structure calculation model comprises an overground structure, the underground structure, the soil body around the underground structure, and the loads of the overground structure and the underground structure; carrying out response spectrum seismic analysis without considering the weight and inertia force of an underground structure and a soil body; then, canceling lateral constraint of a soil body boundary around an outer wall of the underground structure, and carrying out response acceleration method analysis on the underground structure; and performing most disadvantageous superposition and combination on the members of the underground structure in the overall calculation model according to internal force calculated by response spectrum seismic analysis and a response acceleration method, and performing aseismic design of the members. According to the method, the interaction influence of the site soil body, the underground structure and the overground structure can be quickly and conveniently considered, simplified calculation of the earthquake action of the rebuilt underground structure is achieved, and aseismic design can be carried out.

The invention relates to the technical field of rotating machinery fault monitoring, and discloses a method and system for monitoring a torsional vibration fault of a shaft system of a steam turbine generator unit, and the method comprises the steps: obtaining a single-point torsional vibration signal, and converting the single-point torsional vibration signal into an angular domain sequence; extracting a narrow-band modulation component of a specific order band and calculating a torsional vibration logarithmic response spectrum; performing inverse transformation on the logarithmic spectrum to obtain cepstrum data reflecting the periodicity of the shafting structure; delimiting a structure reflection propagation time delay interval according to the geometric distance from the sealing end to the rigid coupling and the material wave velocity; identifying a sealing-coupling boundary reflection peak value and a series structure in the interval, and constructing a series enhancement index; reversely deducing an equivalent reflection intensity and an equivalent structure distance, and generating a health index; and finally, mapping the health index into a binarization result through a step function, and outputting normal or abnormal judgment for the sealed end. According to the invention, the high-sensitivity and deterministic monitoring of the local abnormity of the sealing end is realized by using the echo structure information.

The invention discloses a design method of an integral swing self-resetting structure for mounting a tension-compression energy-dissipation support, and relates to the technical field of civil engineering earthquake resistance, and the integral swing self-resetting structure comprises a tensile limiting device and a compression limiting device; the method specifically comprises the steps that a structural mechanical model is established, and the lateral stiffness of a traditional fixed foundation is calculated; setting a rigid body displacement ratio to determine the vertical and horizontal rigidity and strength of the support; carrying out finite element push-and-cover analysis to verify a rigid body displacement ratio; setting an additional damping ratio; carrying out seismic response spectrum analysis on the vertical seismic isolation structure; calculating the vertical natural vibration period of the structure and adjusting the rigidity according to the response spectrum; carrying out elastic-plastic time-history analysis to detect an interlayer displacement angle, acceleration and structural damage; checking the consistency of the additional damping ratio and the actual energy consumption; and finally, anti-overturning checking calculation under extremely rare earthquake is carried out to ensure that the support and the limiting device are in an elastic state. The energy dissipation capacity and anti-seismic safety of the structure can be effectively improved, and the structure is suitable for various building structures needing vertical and horizontal seismic isolation.

The invention provides a near fault pulse type seismic oscillation generation method, device and equipment and a medium thereof, and relates to the technical field of seismic resistance, and the method comprises the steps: obtaining seismic oscillation parameter data of a near fault; constructing an equivalent velocity pulse model based on the seismic oscillation parameter data of the near fault, and generating a long-period component acceleration time history of an equivalent velocity pulse; performing high-frequency component acceleration time history analysis on the basis of the seismic oscillation parameter data of the near fault to obtain a high-frequency component acceleration time history of seismic oscillation; and carrying out superposition based on the long-period component acceleration time history of the equivalent speed pulse and the high-frequency component acceleration time history of the seismic oscillation, and solving an acceleration response spectrum obtained by superposition through iteration until the acceleration response spectrum reaches a preset requirement, thereby obtaining the near-fault pulse type seismic oscillation. According to the method, the amplitude, the period and the shape of the control speed pulse and the effective duration of the seismic oscillation acceleration time history are met, and the requirement of matching the target response spectrum to obtain random seismic oscillation is met.

The invention provides a workshop floor response spectrum calculation method adopting substructure analysis, and the method comprises the steps: solving a site response problem of a free field through a semi-analytical method based on the modulus and damping of the free field, and obtaining transmission boundary information; respectively calculating foundation impedance matrixes of transmission boundary information through a flexible volume method; calculating an upper structure matrix according to the foundation impedance matrix; the upper structure matrix comprises an upper stiffness matrix, an upper mass matrix and an upper damping matrix; constructing a motion equation according to the foundation impedance matrix and the upper structure matrix, and solving to obtain a frequency domain displacement response transfer function; and performing interpolation calculation on the frequency domain displacement response transfer function to obtain seismic response. According to the method, the calculation of the reaction spectrum is realized through a substructure analysis method for decomposing a linear soil-junction interaction analysis problem into a series of relatively simple subproblems, the calculation efficiency is improved, and the model construction period is shortened.

The application discloses a kind of nuclear fusion device construction earthquake spectrum automatic fitting and structure checking system, comprising: GB parameter library and index module, for using index key retrieval and return specified data domain composition parameter set;Spectrum generation and fitting module, according to internal data of parameter set, call GB database to extract the parameter required for seismic design, automatically truncate negative value and control spectrum tail change consistent, generate the horizontal seismic influence coefficient curve after fitting, vertical seismic influence coefficient curve and corresponding frequency acceleration spectrum;Static equivalent and FRS determination module, the first natural frequency is obtained in fitting data by modal analysis and is judged according to preset threshold, respectively corresponding to static equivalent acceleration and response spectrum analysis operation;Data export and interface module, for output readable load spectrum file.The application can realize the automatic generation export operation of seismic influence curve, frequency acceleration spectrum, and support the seismic spectrum analysis and static strength checking of nuclear fusion device.

The invention discloses an earthquake response spectrum feature extraction method and device based on deep learning, and relates to the technical field of nuclear power equipment earthquake resistance analysis. Comprising the following steps: S1, acquiring seismic response spectrum data required by anti-seismic calculation of equipment or a pipeline in a nuclear power project; s2, preprocessing the seismic response spectrum data; s3, constructing an auto-encoder neural network model; s4, training and verifying the neural network model by using the partially preprocessed seismic response spectrum data; and S5, inputting the remaining preprocessed seismic response spectrum data into the trained neural network model for prediction, and outputting a feature vector after dimension reduction. The method can effectively extract the key features of the seismic response spectrum, can be applied to an intelligent prediction and optimization system of the seismic mechanical calculation result of the equipment or the pipeline, rapidly outputs the stress result of the equipment or the pipeline under the action of the seismic load, remarkably improves the seismic design efficiency of the nuclear power equipment, and reduces the cost. Therefore, the research and development progress of an engineering project and a new model or a new heap model is met.

The invention relates to a seismic oscillation simulation method matched with a long-period response spectrum, and the method achieves the high-precision representation of a 0.03-20 s full-band seismic oscillation characteristic through expanding a response spectrum analysis period to 20 seconds and constructing a low-frequency characteristic seismic oscillation database. According to the method, the limitation that attenuation of a traditional model is too fast in an amplitude drop section is broken through, and a seismic oscillation input solution with broadband spectrum matching precision and geological environment physical characteristic fidelity is provided for aseismic design of long-period structures such as a super high-rise building.

The invention provides a simplified design system for a damping structure. Non-damping structure data calculated through a vibration mode decomposition reaction spectrum method can be obtained through a data importing and preprocessing module; performing calculation and CQC correction on a displacement spectrum according to the obtained acceleration response spectrum through an anti-seismic standard response spectrum calculation module to obtain a displacement spectrum corresponding to the equivalent single-degree-of-freedom system; the performance curve generation module is used for generating a performance curve graph of the system ductility coefficient relative to the rigidity ratio, identifying an optimal performance design point, and generating a damper design scheme according to the number of dampers in each layer; the parameters of the damper are calculated layer by layer according to a preset additional rigidity distribution strategy through a multi-degree-of-freedom system design module, and the matching degree of the deformation capacity of the damper and the interlayer displacement angle requirement is verified; and parameter output and visual display of each layer of damper are realized through a result output and visual module, so that rapid estimation of damper parameters is realized, and preliminary design of a damping structure is completed.

The invention provides a high arch dam earthquake vulnerability analysis method and system based on an extreme gradient lifting tree theory, and the method comprises the steps: obtaining a plurality of pieces of earthquake vibration data meeting the feature requirements of a high arch dam site, and constructing an engineering demand parameter set and an earthquake vibration intensity parameter set; constructing a high arch dam probability earthquake demand model based on an extreme gradient lifting tree model, and fitting a non-linear relationship between engineering demand parameters and earthquake intensity parameters; fitting a change curve of the engineering demand parameters with respect to the acceleration response spectrum value in the first-order natural vibration period based on a scalar model, and extracting boundary values divided by different anti-seismic performance levels; and on the basis of an engineering demand parameter logarithmic normal distribution hypothesis, using the fitted high arch dam probability earthquake demand model to construct an earth surface vulnerability function, and inputting an earth vibration strength parameter and boundary values of different anti-seismic performance levels for calculation to obtain earthquake vulnerability probabilities of the high arch dam under the different anti-seismic performance levels.

The invention discloses an ice vibration response spectrum analysis method and system based on sea ice parameter distribution characteristics, and relates to the field of ice engineering calculation analysis, and the method comprises the steps: constructing an offshore wind turbine motion control equation of a single-degree-of-freedom system under the action of sea ice, and obtaining the power spectrum density of a dynamic ice load; based on compression strength and bending strength of sea ice, a joint probability density function of ice thickness and ice speed is obtained, and an ice area is partitioned; ice force time history samples are obtained, corresponding acceleration response spectrums are deduced and established according to different divided ice areas, and equivalent sea ice force acting on a single-degree-of-freedom system is obtained; and maximum data of all response spectrum curves of different sea ice time history samples in each ice area are taken, and a segmented fitting method is adopted to obtain a design response spectrum of sea ice force. The dynamic ice force time history and the dynamic response of the offshore wind turbine can be quickly and accurately obtained under different sea ice parameters, and technical support is provided for ice-resistant design of an offshore structure.

This invention belongs to the field of frequency domain seismic simulation analysis technology for computer cabinets. Specifically, it provides a method, device, equipment, and medium for extracting plastic strain from the seismic response of a computer cabinet. The method includes: the displacement field of the computer cabinet under a set response spectrum; extracting the displacement results of all unit nodes of the cabinet and storing them locally; processing the displacement result file; copying the original finite element model to generate a new calculation model; resetting the analysis step of the new calculation model to static analysis and adding plastic material parameters to the material; defining a discrete field; importing the data file after processing the displacement results into the new calculation model to generate a discrete field; applying displacement boundary constraints to all nodes of the cabinet in the new calculation model; and, after receiving the set trigger information, calculating and extracting the plastic index of the cabinet at the most dangerous moment during the seismic experiment. The displacement results are processed and assigned to the new model through the definition of a discrete field, reducing testing costs.

This invention relates to a seismic performance optimization and evaluation system for long-span bridges based on digital twins, belonging to the fields of computer science and bridge engineering. The optimization and evaluation system includes a data acquisition and preprocessing module, a model update module, and a performance evaluation and optimization module. The optimization and evaluation method includes identifying the structural modes and frequencies to obtain the bridge's mode shapes and natural frequencies, and establishing a digital twin model of the target bridge. Based on a multi-objective optimization design function, supercomputing-driven optimization of vibration reduction device parameters is performed, outputting the optimal parameter combination to control the bridge's graded response under earthquakes. The artificial wave generated based on the bridge's design response spectrum can fully consider the dynamic characteristics of long-span cable-stayed bridges and the seismic motion characteristics of the design site. Simultaneously, the seismic optimization design process only involves the time history analysis of a single ground motion, significantly reducing the computational load of the optimization design and better considering the comprehensive influence of various nonlinear factors on the bridge's seismic response, thus significantly simplifying the complexity of seismic optimization for long-span bridges.

The invention relates to the technical field of seismic engineering and artificial intelligence, in particular to a seismic oscillation selection method and system based on spectral feature extraction and clustering, and discloses a seismic oscillation record selection method based on principal component analysis dimensionality reduction and K-means clustering. The method comprises the following steps: firstly, acquiring candidate records from a database according to set seismic parameters of a site, and performing pulse and non-pulse label division; amplitude modulation and normalization preprocessing are carried out on the response spectrum data, and a high-dimensional acceleration response spectrum is compressed into low-dimensional potential features through PCA dimension reduction; and finally, on the basis of a dimension reduction result, performing grouping by applying a K-means clustering method, and performing record selection and response spectrum comparison. The system comprises a record reading and processing module, a feature extraction module, a feature clustering module, a verification module and an output module, velocity pulse and non-pulse classification is carried out before an alternative record data set is constructed, and a near fault velocity pulse effect is considered at the beginning of record selection.

The invention discloses an earthquake simulation method for an energy storage container. The method comprises the following steps: acquiring an initial three-dimensional model of the energy storage container; constructing a corresponding multi-rigid body system; carrying out modal analysis on the multi-rigid-body system by adopting an SRSS method to obtain the sum of rigid modals so as to generate a corresponding time domain-multi-rigid-body system seismic response spectrum; and converting the time domain-multi-rigid-body system seismic response spectrum into a corresponding frequency domain-multi-rigid-body system seismic response spectrum, and solving an equation under the action of seismic acceleration based on the frequency domain-multi-rigid-body system seismic response spectrum to obtain an acceleration response curve of each rigid body. The invention further provides an energy storage container earthquake simulation system. According to the method provided by the invention, the response of the energy storage container under the earthquake action can be quickly and accurately simulated, so that a scientific basis is provided for design, installation and operation of the energy storage container.

The embodiment of the invention discloses a non-stationary seismic oscillation generation method and device, electronic equipment and a storage medium, and relates to the technical field of seismic engineering, and the method comprises the steps: 1, generating a seed seismic oscillation time history based on a power spectrum model; 2, performing wavelet packet decomposition on the seed seismic oscillation time history to obtain a group of sub-signal components in a time-frequency domain, and identifying a strong seismic time period; 3, constructing a time-varying function, and correcting sub-signal components in a strong earthquake time period; 4, reconstructing and generating an intermediate seismic oscillation time history according to the adjusted sub-signal components, and judging whether the intermediate seismic oscillation time history meets a preset precision requirement or not; if not, taking the intermediate seismic oscillation time history as a new seed seismic oscillation time history, and repeating the steps until a preset precision requirement is met; through time domain localization correction, the contradiction between response spectrum matching and intensity non-stationary maintenance is solved, seismic oscillation which accords with a target response spectrum and has real non-stationary characteristics is generated, and the reliability of anti-seismic analysis is improved.

The invention provides a near-fault seismic motion vector type intensity index construction method, and belongs to the technical field of structural toughness anti-seismic analysis, and the method comprises the steps: calculating a value of an ideal speed pulse signal acceleration response spectrum at a structural basic period under a 5% damping ratio, and taking the value as a near-fault seismic motion speed pulse spectrum characteristic representation parameter; calculating the normalized total speed pulse duration, and representing the influence of the multi-speed pulse generation time process on the low-cycle fatigue damage of the structure; the two parameters are combined into a vector, namely the near-fault multi-speed pulse record vector type intensity index. According to the method, the structure dynamic response is directly associated with the velocity pulse frequency spectrum characteristic, meanwhile, the pulse generation time process parameters are introduced for the first time, the structure fatigue damage is associated with the velocity pulse generation process in the seismic oscillation, the near-fault multi-velocity pulse seismic oscillation intensity can be effectively represented, and the accuracy of the seismic oscillation intensity is improved. And the influence on the seismic response of the structure can be measured more accurately.

The invention relates to the technical field of research reactor earthquake monitoring, and provides a research reactor earthquake monitoring system and method, and the system comprises a plurality of collection ends, a plurality of digital strong motion instruments, and a terminal cabinet. Each acquisition end acquires an acceleration sensing signal of each monitoring point and transmits the acceleration sensing signal to each corresponding digital strong motion seismograph; each digital strong-motion seismograph converts the acceleration sensing signal into an acceleration digital signal, judges whether to generate single-monitoring-point alarm data according to the acceleration digital signal, and transmits the single-monitoring-point alarm data to the terminal cabinet when the single-monitoring-point alarm data is generated; and the terminal cabinet calculates a response spectrum and / or a cumulative absolute speed according to the alarm data of the single monitoring point, judges whether to generate stack stop alarm data or not according to the response spectrum and / or the cumulative absolute speed, and gives an alarm when the stack stop alarm data is generated. According to the system provided by the invention, the accuracy of earthquake monitoring is improved, and false triggering heap stop is prevented.

The invention relates to a seismic oscillation simulation method for collaborative optimization of a long-period multi-damping-ratio response spectrum and a power spectrum, and the method comprises the following steps: determining a standard long-period response spectrum and a corresponding power spectrum density, forming a target power spectrum, carrying out the matching of seismic oscillation fitting of a long-period multi-damping-ratio target response spectrum-power spectrum, and carrying out the repeated iteration, and outputting the earthquake acceleration time history meeting the target requirement until the maximum difference value is smaller than the allowable error. According to the seismic oscillation simulation method, a reliable artificial vibration generation technology with higher applicability can be provided for seismic design of long-period structures such as super high-rise buildings and large water tanks.

The application discloses a high-low frequency seismic wave superposition method considering dam engineering characteristics, and belongs to the technical field of seismic wave input. First, the dam natural frequency is calculated according to the regional seismic source parameters of the dam engineering, and the low-frequency vibration simulation range is determined. Then, in combination with the high-frequency seismic wave randomness of the region, a database of high-frequency seismic waves of multiple schemes is simulated, and high-frequency seed seismic waves matching the dam river direction and vertical mode are selected from the database. Next, the low-frequency seed seismic wave is simulated in the low-frequency simulation range, and the wide-band seed seismic wave is synthesized to determine the wide-band target spectrum. Finally, the target spectrum and the target PGA are taken as targets, and the wide-band mixed seismic wave is obtained by using the wavelet time domain response spectrum fitting method. The high-low frequency seismic wave simulation method provided by the method fully considers the frequency component in the dam fundamental frequency range, avoids underestimating the response spectrum due to the lack of frequency component when superposition is performed, considers multiple frequency points by using the wavelet fitting, avoids the energy cavity of the wide-band, and meets the demand of the dam engineering.

This invention belongs to the field of seismic design technology for railway bridges, and relates to a seismic analysis method for railway bridges using a variable friction coefficient friction pendulum bearing for seismic isolation and vibration reduction. This method is used to determine the design displacement D of the variable friction coefficient friction pendulum bearing; specifically, it includes the following steps: establishing an equivalent period T based on the design parameters of the variable friction coefficient friction pendulum bearing. eff The relationship between the coefficient of friction and the variable friction coefficient; based on the bridge design conditions, the relationship between the equivalent period and the acceleration response spectrum value is established, and S(T) is obtained. eff Determine the damping adjustment coefficient η; equivalent damping ratio ξ; establish support displacement and equivalent period T. eff S(T) eff By considering the relationship between η and η, and combining it with Newton's iteration process, the final support displacement D is determined. This invention saves time by using analytical expressions for calculation, avoiding tedious modeling, long computation times, and convergence issues compared to the finite element model nonlinear time history analysis method. This allows for rapid evaluation of the seismic performance of different support parameters and structural configurations during the scheme design, parameter optimization, and preliminary design stages.

The present application relates to the technical field of intelligent sensor, specifically to a stainless steel pipe quality evaluation method and system based on detection response, comprising: constructing and emitting a specific phase encoding excitation flow, and collecting the response after the propagation in the stainless steel pipe; generating the response spectrum available for analysis by processing the response signal; determining two key physical performance parameters representing the material by analyzing the response spectrum: the bulk nonlinear acoustic characteristic value reflecting the microscopic physical properties, and the interface modulation acoustic characteristic value reflecting the structural integrity; finally, based on the comprehensive evaluation of the two determined physical performance parameters, the precise differentiation of the material physical property degradation and the internal structure discontinuity is realized. The present application can realize the synchronous analysis and evaluation of multiple physical performances of the material through one nondestructive testing.

The invention discloses a floor design spectrum generation method based on a genetic algorithm. The method comprises the steps that seismic waves are selected to be input into a three-dimensional finite element analysis model of a building structure for dynamic time history analysis, and an acceleration time history of an equipment installation layer is extracted; obtaining a floor response spectrum and carrying out normalization processing to obtain an amplification coefficient spectrum; designing an expression of a target spectrum containing to-be-optimized parameters and constraint conditions of the target spectrum; a specific expression of the target spectrum ap * is obtained and serves as a floor design spectrum. According to the floor design spectrum generation method based on the genetic algorithm, the problem that in the existing anti-seismic field, floor design spectrums are often established depending on experience, a universal and applicable generation method is lacked is solved, the method is easy to operate, designers can conveniently carry out equipment anti-seismic design, the established floor design spectrum can be used for equipment anti-seismic design, and the design efficiency is improved. And equipment function loss in an earthquake is avoided.

The embodiment of the invention provides a stochastic simulation method and device for pulse type seismic oscillation, and belongs to the technical field of seismic oscillation simulation. The corresponding method comprises the following steps: determining a pulse parameter and a residual parameter of pulse type seismic oscillation according to a scene parameter of the pulse type seismic oscillation; wherein the scene parameters comprise the moment magnitude, fault distance, site shear wave velocity and directivity effect parameters of the pulse type seismic oscillation; and generating a time history model of the pulse type seismic oscillation according to the pulse parameters and the residual parameters so as to simulate the pulse type seismic oscillation. The method provided by the invention breaks through the limitation of a single pulse function of an existing related method, pulse type seismic oscillation with waveform diversity in a specific seismic scene can be generated, the long-period response spectrum precision is remarkably improved, and high-reliability input data is provided for seismic design of a near-fault engineering structure.

The application relates to a method and device for selecting seismic records in elastic time-history analysis, which comprises the following steps: using effective peak ground acceleration (EPA) to adjust the amplitude of initial seismic records used in elastic time-history analysis, and screening the initial seismic records according to preset first selection parameters to obtain first seismic records; using causal inference to screen seismic parameters directly causing structure base shear, as second selection parameters; and screening the first seismic records according to the second selection parameters to obtain final seismic records used in time-history analysis. Through the method, the dispersion of final structure base shear can be well controlled, so that the results of mode decomposition response spectrum method can be corrected by using the results of elastic time-history analysis.