44 results about "Response spectrum" patented technology

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 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 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 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 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 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 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 invention relates to the technical field of seismic engineering, in particular to a multi-condition seismic oscillation generation method based on a diffusion model, which comprises the following steps: firstly, extracting multi-dimensional condition parameters such as a response spectrum, a peak acceleration, Arias intensity, energy arrival time, significant duration and a Husid curve from a seismic oscillation acceleration time history, and carrying out normalization processing; the acceleration time history is converted into a normalized logarithmic magnitude spectrum through short-time Fourier transform to serve as a learning target; constructing a Transform condition encoder to capture a coupling relationship of multi-source conditions, designing a de-noising network based on U-Net, and integrating a cross attention mechanism to realize accurate condition injection; a denoising diffusion probability model training strategy is adopted to optimize the noise prediction network; during reasoning, a denoising diffusion implicit model sampling strategy is adopted, phase information is iteratively reconstructed from an amplitude spectrum through a Griffin-Lim algorithm, and a seismic oscillation acceleration time history is obtained through inverse transformation. According to the invention, cooperative accurate control of the response spectrum and the energy non-stationary characteristic is realized, training is stable, reasoning is efficient, and diversity generation is supported.

The invention relates to the technical field of building structure health monitoring, and particularly discloses an old building structure damage diagnosis system based on micro-vibration and acoustic emission, which comprises the following steps: firstly, acquiring low-frequency vibration data under environmental excitation by using a micro-vibration sensor array, and constructing a dynamic response feature baseline to quantify a structure health state; a high-frequency energy release event is captured through an acoustic emission probe, noise interference is filtered in combination with a dynamic threshold value, and an instantaneous acoustic emission event signal is generated; further, comparing the structure dynamic response data before and after the event with the baseline to generate a post-event response deviation measure, and discriminating the event property according to the irreversibility of the post-event response deviation measure; for a property fuzzy event, the system activates the controllable micro excitation source to carry out an active knock test, and an active excitation response map is generated to confirm a damage state; finally, the system outputs a verification report containing the damage position, property and degree, and a scientific basis is provided for preventive maintenance of old buildings.

To provide an earthquake information distribution system etc. that can realize evacuation taking into consideration the impact of damage to buildings. [Solution] The earthquake information distribution system includes a receiving unit that receives emergency earthquake alerts distributed by the Japan Meteorological Agency, a prediction unit that, when the emergency earthquake alert is received, calculates a predicted value of the seismic intensity at a specified location based on the emergency earthquake alert, an evaluation unit that predicts the response spectrum of a building at the specified location based on the emergency earthquake alert and performs a damage assessment of the building based on the predicted response spectrum results, and a distribution unit that distributes earthquake information including information regarding evacuation instructions based on the damage assessment to terminals at specified locations where the predicted value of the seismic intensity exceeds a threshold, and the evaluation unit calculates the response spectrum of the building using a response calculation model based on the observation results of a seismometer installed in the building, and performs a damage assessment of the building again based on the calculated response spectrum results.

The invention discloses a method for obtaining an earthquake response result of a pipeline structure and a related device, and relates to the technical field of nuclear power station safety engineering.The method comprises the steps that firstly, a nuclear island main loop structure and the pipeline structure are independently modeled through a finite element algorithm and a pipeline special algorithm, and customized analysis of structures with different characteristics is achieved; thirdly, calculating the response of a connectable point of a main loop structure under a real seismic oscillation time history, converting the response into a seismic response response spectrum, and concentrating complex time history information into spectrum data representing the maximum response of the point; and then, the obtained earthquake response response spectrum is applied to the corresponding connection points of the pipeline structure model, and the earthquake response of the main loop structure is accurately transmitted to the pipeline structure model, so that the state of the pipeline structure attached to the main loop structure in an actual earthquake is physically and truly simulated. Finally, the seismic response result of the pipeline structure model obtained based on the accurate input also has high accuracy.

- Method and device for determining and using a diagnostic tool comprising an extreme temperature response spectrum. - The method comprises a step (E1) of receiving at least one temperature curve representing a temperature variation over time at a given geographical location, a processing step (E2) comprising a series of successive substeps (E2A, E2B, E2C), implemented iteratively for different values ​​of a characteristic time associated with a type of equipment, comprising a substep (E2A) for filtering the temperature curve using a first-order filter having said characteristic time as its time constant, a substep (E2B) for extracting a temperature value corresponding to a specific temperature parameter, and a substep (E2C) for associating this extracted temperature value with the characteristic time.The pairs of values ​​obtained at the end of the iterations form an extreme temperature response spectrum, and a step (E3) is used to perform comparisons, at least from this spectrum, to carry out a diagnosis. Figure for the abstract: Fig 4.

This invention relates to the field of seismic wave analysis technology, specifically a method for distinguishing and correlating ground motion parameters of the upper and lower reservoirs of a large pumped storage power station. The method includes the following steps: acquiring three-dimensional wave velocity and coordinate data of the upper and lower reservoirs through remote sensing mapping and drilling tests; modeling and simulating the wave field to output acceleration response; extracting phase abrupt change points, calculating density functions to generate a comparison table; statistically analyzing the offset and density distribution of abrupt change points; calculating normalized offset rates to form a discriminant dataset; extracting peak acceleration and response spectrum parameters to construct a feature set; training a random forest regression model to establish a mapping relationship; and introducing topographic propagation coefficients for calibration to generate a correlation table. In this invention, by jointly modeling topography and wave velocity to reconstruct the influence of structural differences on seismic wave paths, segmenting acceleration sequences to analyze abrupt change characteristics, and extracting peak values ​​and spectral points to quantify response differences, the method improves the analytical capability and matching degree of ground motion characteristics.

The invention discloses a transformer used in a seismic zone tunnel and an anti-seismic simulation method thereof, and belongs to the technical field of transformer simulation detection, and the method comprises the following steps: building a transformer structure simulation model; performing static analysis to obtain the maximum stress of the transformer; the first-order vibration frequency of the transformer is obtained through modal analysis, and the first-order vibration frequency of the transformer is used for representing the lowest frequency vibration characteristic generated by the structure of the transformer due to the material attribute when the transformer has no external excitation; performing response spectrum analysis to obtain equivalent stress distribution and an equivalent stress value of the transformer under the simulated seismic load; performing fatigue analysis based on the equivalent stress value of the transformer, and estimating the fatigue strength of the transformer structure; according to the scheme, the transformer can be arranged in a split mode in a seismic zone tunnel, the anti-seismic performance of the transformer in an earthquake can be evaluated, and the structural safety of the transformer is verified by simulating the seismic load waveform and the vibration response.

A method for improving the accuracy of SXR measurements, comprising: obtaining a first diffraction spectrum comprising a plurality of periodic discrete peaks and associated with a target structure that has been illuminated with a first source spectrum; obtaining a second diffraction spectrum associated with a target structure that has been illuminated with a second source spectrum, the second source spectrum being complementary to the first source spectrum; determining a first response spectrum of the target structure based on the first source spectrum and the first diffraction spectrum; determining a second response spectrum of the target structure based on the second source spectrum and the second diffraction spectrum; combining the first response spectrum with the second response spectrum to construct an improved response spectrum having fewer gaps than the first response spectrum; and determining a property of interest of the target structure using the improved response spectrum.

The invention relates to the technical field of space seismic oscillation, in particular to a seismic oscillation generation method based on response spectrum conversion and a statistical coherence function, and the method comprises the steps: 1, determining a designed seismic oscillation acceleration response spectrum curve under a target site; 2, converting the design response spectrum into an underground power spectrum model of the field according to Kaul conversion; 3, hysteresis coherence function parameters are selected according to site types, and a hysteresis coherence function is constructed in combination with the point location distance; 4, calculating a cross-power spectrum matrix according to the power spectrum model obtained in the step 2 and the coherence function model obtained in the step 3; step 5, performing extraction decomposition on the cross-power spectrum matrix to obtain a coefficient matrix reflecting correlation between seismic oscillation of two points; 6, determining the amplitude and phase angle under each frequency component according to the matrix obtained in the step 5, and generating a seismic oscillation acceleration time history; the spatial non-uniform seismic motion meeting the specification requirement is generated in a high-precision manner, and the structural response under the spatial non-uniform seismic motion can be accurately calculated.

The invention discloses a subarea non-uniform foundation gravity dam structure foundation interaction analysis method based on an SBFEM, and the method achieves the refined simulation of the seismic wave propagation, reflection and energy dissipation process under the subarea non-uniform foundation condition through the coupling modeling of a proportional boundary finite element method and a finite element method. Calculation deviation caused by simplification of boundary conditions or neglecting of material heterogeneity in a traditional method is avoided; in the analysis process, universal finite element software is used for building a finite element model containing a layered foundation, SBFEM core algorithm solving is achieved through programming software, convolution integration and dynamic response analysis are finally completed on a numerical calculation software platform, and a complete and efficient dynamic response analysis system is formed. The seismic response spectrum output by the method can truly reflect the dynamic characteristics under the foundation-structure coupling effect, the computational logic is clear, the operation process is standard, and the problem of analysis result distortion caused by too simplified or conservative assumed conditions can be effectively avoided.

This invention provides a near-fault ground motion simulation method considering soil layer site effects. This method primarily uses regression analysis based on measured site seismic records to obtain an acceleration spectrum amplification coefficient equation that considers soil layer site amplification effects and near-fault ground motion characteristics. This establishes a probabilistic seismic hazard analysis method for the site considering soil layer site effects. This method can determine the near-fault consistent hazard response spectrum. Then, using the obtained near-fault consistent hazard response spectrum as the target spectrum, the seismic records are adjusted using a superposition wavelet method to obtain near-fault ground motions that meet the requirements. The method proposed in this invention can more accurately assess near-fault earthquake hazards and is suitable for widespread application.

The invention discloses a random seismic oscillation dimensionality reduction modeling method of a non-iterative high-matching standard response spectrum, and belongs to the technical field of engineering structure earthquake resistance, and the method comprises the steps: S1, building a stable seismic oscillation power spectrum model; s2, establishing a non-stationary seismic oscillation evolution power spectrum model; s3, expressing a non-stationary seismic oscillation process as a function form of a single random variable by adopting a dimension reduction method based on a spectral representation-random orthogonal function; s4, determining undetermined parameters of the evolution power spectrum model based on a particle swarm optimization algorithm by taking a standard response spectrum as a target; and S5, generating a representative sample set of the seismic oscillation acceleration, calculating an average response spectrum, and comparing the average response spectrum with a standard response spectrum. According to the method, the average response spectrum and the standard response spectrum of the random seismic oscillation representative sample set generated at a time can be directly fitted with high precision, and iteration is not needed; and the representative sample set generated by the method is a complete probability set, and a foundation is laid for realizing anti-seismic reliability analysis of a complex engineering structure in a total probability sense.

This application relates to a seismic motion simulation method that matches long-period response spectra. By extending the response spectrum analysis period to 20 seconds and constructing a low-frequency characteristic seismic motion database, high-precision characterization of seismic motion characteristics across the entire frequency band from 0.03 to 20 seconds is achieved. This method overcomes the limitation of traditional models that decay too quickly in the amplitude descent segment, providing a seismic motion input solution for the seismic design of long-period structures such as super high-rise buildings that combines broadband spectral matching accuracy with fidelity to the physical characteristics of the geological environment.