132 results about "Seismic analysis" patented technology

The invention relates to the technical field of coal mine water disaster prevention and control, and particularly discloses a hidden structure detection system for mine water disaster intelligent monitoring, early warning and prevention, which is used for solving the problems of low mine hidden structure detection precision, mine water disaster early warning lag and large seismic wave propagation path simulation error. Comprising a multi-source data comprehensive detection module, a real-time imaging module, a micro-seismic multi-scale intelligent analysis module, a seismic wave signal identification module, a regional difference analysis module and an intelligent data processing module. According to the invention, through fusion of multi-source data, real-time imaging, micro-seismic analysis, seismic wave identification and intelligent data processing technologies, precise detection of a mine hidden structure, high-precision prediction of mine earthquakes and water disasters and real-time risk early warning are realized, and timeliness and accuracy of mine water disaster prevention and control are improved.

The invention relates to the technical field of bridge maintenance, in particular to a beam bridge dynamic anti-seismic performance evaluation method and system, and the method comprises the steps: model preparation, model establishment, boundary condition and load application, analysis and calculation, and result analysis and evaluation. According to the method, through detailed data collection and model preparation, a detailed finite element model of the bridge is accurately constructed, actual characteristics of a main beam, a pier, a support and other key components are fully considered, boundary conditions are reasonably set, seismic loads are applied, calculation is performed by adopting a proper anti-seismic analysis method, and the seismic response of the bridge is effectively calculated; the method has the advantages that the method is simple, the anti-seismic performance of the bridge under the earthquake action is evaluated, potential weak parts of the bridge under the earthquake action are accurately identified, reliable basis is provided for formulating targeted anti-seismic reinforcement measures, and the efficiency and reliability of anti-seismic analysis and performance evaluation of the bridge structure are remarkably improved.

The invention discloses a high-rise shear wall structure anti-seismic effect evaluation method and system, and particularly relates to the technical field of high-rise shear walls. The method comprises the following steps: accurately collecting low-cycle fatigue parameters, constructing a concrete and steel bar degradation model considering a fatigue effect, applying the model to anti-seismic analysis of a shear wall structure, simulating the influence of main shock and multiple aftershock loading on structural performance, drawing a bearing capacity degradation curve according to multiple loading results, and analyzing a degradation speed abnormal state. The risk that the structural rigidity and the bearing capacity are abnormal is judged by combining the change of the residual rigidity and the bearing capacity, the risk is divided into high, medium and low levels, and proper reinforcement or prevention measures are provided for different risk levels, so that the defect that the material fatigue effect is not fully considered in the existing anti-seismic evaluation is effectively overcome, and the anti-seismic evaluation accuracy is improved. According to the method, the damage accumulation condition of the high-rise shear wall structure in frequent aftershocks can be predicted more accurately, so that the risk of premature failure of the structure is reduced, and the durability and safety of a building in an earthquake are improved.

The invention provides a coal mine water inrush risk early warning method and system under multi-source information, and relates to the technical field of risk early warning, and the method comprises the steps: employing a multi-source information collection module to regularly collect geological structure data, hydrological data, microseismic signals and environment monitoring data in a coal mine operation area, and constructing a multi-source information database; performing data preprocessing to obtain a standard multi-source information database; carrying out multi-source data fusion, and constructing a water inrush risk comprehensive evaluation model in combination with a geological model, a hydrological model and a micro-seismic analysis model; analyzing the water inrush risk index in real time, and generating water inrush risk early warning information when the model output value is higher than a preset risk threshold value; and performing visual display of the water inrush risk early warning information through a visual interface. The technical problem that the prior art depends on a single data source and cannot comprehensively reflect complex condition changes in a coal mine operation area, so that accuracy of water inrush risk assessment is insufficient, and then early warning of the water inrush risk is missed is solved.

The present invention relates to the technical field of coastal engineering, and disclosed is a method for evaluating a radiation hydrodynamic force for a concentric cylindrical structure, comprising the following steps: S1, coordinate system establishment: establishing a cylindrical coordinate system orθz and a Cartesian coordinate system oxyz by taking the intersection of the center of a concentric cylindrical structure and a still water surface as the origin, where the z-axis is vertically upward; S2, flow field division: dividing the entire flow field into an outer domain and an inner domain; S3, perforated boundary condition assumption; S4, determining radiation velocity potentials of the inner domain and the outer domain by means of governing equations and boundary conditions; and S5, by means of the expressions of velocity potential functions of the inner and outer domains, determining first-order radiation forces, added masses and damping coefficients generated by the vibration of an inner cylinder and an outer cylinder. The method takes into account both the effects of seismic and radiation hydrodynamic forces, provides accurate structural response prediction, fills the technological gap in the field of seismic analysis of concentric cylindrical structures as breakwater units, and provides a reliable basis for engineering design.

The invention relates to the technical field of computer-aided anti-seismic analysis, and discloses an anti-seismic performance simulation test method and system for a concrete-filled steel tube structure, and the method comprises the steps: obtaining a parameter set of the concrete-filled steel tube structure; identifying a critical buckling mode and constructing a defect correction model; constructing a coupling damage index; constructing a numerical instability risk evaluation value based on the structure energy proportion; carrying out strong earthquake nonlinear time-history iterative solution; and outputting the anti-seismic performance index set and the coupling failure area. Compared with the prior art, the technical problem that Newton iteration divergence is prone to occurring in numerical solution under the coupling instability condition that traditional nonlinear finite element analysis is relied on for strong earthquake response calculation, especially when a steel pipe is subjected to local buckling and core concrete enters a high-pressure three-axis stress state is solved. Due to the fact that the local buckling and crushing damage coupling index and the self-adaptive time step length adjusting mechanism are constructed, the stability of the anti-seismic performance simulation result of the concrete-filled steel tube structure under the strong earthquake effect is improved.

The invention discloses a seismic fault identification method based on a Dual-Attention mechanism and a multi-scale fusion network, and belongs to the technical field of seismic data interpretation, and the method comprises the following steps: S1, obtaining three-dimensional post-stack seismic data, and carrying out the slicing of a seismic data body, and obtaining multi-channel seismic data; s2, a DAMFault Net fault recognition model is constructed; s3, completing fault feature extraction in a coding stage; s4, obtaining an intermediate aggregation feature and an original same-scale feature from an encoder in a decoding stage; s5, adding a depth supervision mechanism to a tail end decoder; and S6, splicing and recovering prediction results to the size of the original seismic section. According to the seismic fault identification method based on the Dual-Attention mechanism and the multi-scale fusion network, excellent accuracy and fault continuity identification capability are shown in a fault identification task, and automatic, efficient and accurate identification of the fault in the seismic image is realized; and powerful technical support is provided for seismic analysis and research.

The invention is suitable for the technical field of seismic analysis, and provides a structure seismic performance analysis method and device considering cross-fault seismic oscillation, and a terminal. The method comprises the following steps: acquiring earthquake magnitude data, and calculating a recurrence period of each earthquake magnitude; establishing an empirical relationship between the magnitude and the recurrence period; calculating geometric dimension parameters of the fault through the empirical relation, and determining a research area crossing the fault and a fault fracture model; according to the fault fracture model, the digital elevation model and the soil layer information model, broadband seismic oscillation simulation is carried out, and an engineering site cross-fault seismic oscillation field is obtained; the method comprises the following steps: establishing a finite element model containing a cross-fault structure and surrounding rock, converting seismic oscillation into an equivalent force load on a boundary node of the finite element model, applying the equivalent force load on the boundary node of the finite element model, and performing cross-fault seismic response analysis on the cross-fault structure. According to the method, a closed-loop process from seismic oscillation selection input to performance index evaluation is realized, and a systematic solution is provided for anti-seismic performance evaluation analysis of a cross-fault structure.

The invention discloses a method for determining the spring coefficient of an underground structure foundation based on a reaction displacement method, which takes structure size / burial depth / soil parameters and the thickness from the bottom of a structure to bedrock as variables, adopts a finite element calculation method to solve the spring coefficient of the foundation at different parts of the structure, and combines a data fitting method to determine the spring coefficient of the underground structure foundation. The invention provides a method for accurately determining the spring coefficient of the underground structure foundation based on a reaction displacement method. When a homogeneous soil body is popularized to a layered soil body, a suggested value of the influence range of the spring coefficient of each position of the structure by the surrounding soil body is given. Compared with a traditional foundation spring coefficient formula method, the method is simple, convenient and efficient, the defects of an existing foundation spring coefficient valuing method are overcome, the difference between the foundation spring coefficients of all positions of the structure is considered, various influence factors of the foundation spring coefficients of the underground structure can be comprehensively and truly reflected, and the method is suitable for popularization and application. The influence range of the spring coefficient of each position of the layered foundation subsurface structure on the surrounding soil body is defined, so that the calculation precision is greatly improved, and the method can be popularized and used in subsurface structure anti-seismic analysis.

The invention provides an urban water supply system anti-seismic analysis method based on a multi-fineness digital twinborn model, and belongs to the technical field of intelligent disaster prevention and digital twinborn of urban infrastructure systems. Constructing a topological network model and a hydraulic model of the city-level pipe network; constructing a multi-fineness parameterized numerical model library, and designing a dynamic scheduling engine based on event response; constructing a bidirectional data conversion interface and a unified semantic framework, and constructing a multi-fineness digital twin model; performing simulation by using the multi-fineness digital twin model to obtain a real-time simulation result; based on the real-time simulation result, the comprehensive state of the urban water supply system is visualized, an emergency decision is made, and anti-seismic analysis of the urban water supply system is completed; the problems of precision and efficiency imbalance, collaborative decision-making obstacle and serious lagging of disaster scene response existing in anti-seismic analysis of an existing urban water supply system are solved.

The invention discloses a vibration double-control method based on a three-dimensional variable-stiffness vibration isolation support. The vibration double-control method comprises the steps that an initial value is calculated; a vertical rigidity adjusting step; a bidirectional rigidity adjusting step; wherein the step of calculating the initial value further comprises the step of calculating the vertical displacement of the three-dimensional variable-stiffness vibration isolation support, and the step of adjusting the vertical stiffness is used for determining a first-order vertical stiffness final value of the three-dimensional variable-stiffness vibration isolation support through vibration control analysis. The bidirectional rigidity adjusting step is used for determining the final values of the second-order vertical rigidity, the horizontal rigidity and the damping coefficient of the three-dimensional variable-rigidity vibration isolation support through rare earthquake analysis. By means of the method, the vertical rigidity, the horizontal rigidity and the damping coefficient of the three-dimensional variable-rigidity vibration isolation support can be accurately obtained, and subway vibration control and earthquake control can be more accurately conducted on a building structure at the same time. The invention further provides a three-dimensional variable-stiffness vibration isolation support.

The invention relates to an anti-seismic analysis method and system for a full-reactor-core assembly of a fast reactor and a medium, and the method comprises the steps: carrying out the equivalent decomposition of a full-reactor nonlinear multi-assembly system into a series of linear single-assembly vibration systems; based on numerical simulation, calculating an additional mass coefficient of the feature component to simulate the influence of fluid-solid coupling on component vibration; based on an Euler-Bernoulli theory, a connector and an additional mass coefficient, establishing unrelated finite beam unit models of the single reactor core assembly; carrying out dimensionality reduction on a vibration system of the single reactor core assembly to obtain a solution of a single-degree-of-freedom system; calculating vibration response of the single-degree-of-freedom system under modal coordinates by adopting a central difference method, and converting the vibration response into dynamic response under physical coordinates; if the seismic acceleration time history stops, deflection analysis and contact analysis are performed. According to the method, the structural dynamic response under the gap condition is rapidly solved, and the calculation efficiency of the method is greatly improved.

The invention belongs to the technical field related to tunnel anti-seismic analysis, and discloses a green function analytical method and equipment for rayleigh wave dynamic coupling response of an interval tunnel in an inclined field. The method comprises the steps that S1, soil deformation and displacement in the x direction and the y direction caused by Rayleigh wave propagation are converted into tunnel equivalent seismic loads in the x direction and the y direction through a viscoelastic geobasic structure model; s2, a Timoshenko beam model on a viscoelastic Pasternak foundation is adopted to establish a partial differential equation set for controlling axial and transverse dynamic displacement responses of longitudinal discrete units of the interval tunnel; s3, deducing four Green functions representing the bidirectional dynamic coupling response of the tunnel in combination with a Green function method and an artificial spring boundary; and S4, performing integral operation on the Green function by using a superposition principle, and introducing an exponential function term containing time t to obtain axial displacement and transverse displacement of the tunnel and corresponding axial and transverse dynamic coupling response coefficients. According to the invention, the solving efficiency is improved.

The invention belongs to the field of interaction between soil and a structure in geotechnical engineering, and provides a method for judging a local influence range of a cross station structure in a vibration table test. Comprising the steps of 1, designing a three-dimensional reduced scale model of the cross transfer station; 2, designing three-dimensional measuring points of the cross transfer station model; 3, generating an internal force characteristic curve of the cross transfer section; and 4, judging the influence range of the local cross transfer section of the station structure. According to the method, after the influence range of the cross transfer section of the cross station structure is determined, the cross transfer subway station structure can be divided into two parts to be subjected to anti-seismic analysis by adopting a segmentation processing method, and the problem of spatial effect influence factors of the cross transfer station is effectively solved.

The invention is suitable for the technical field of seismic analysis, and provides a cross-fault tunnel fault movement-seismic oscillation decoupling analysis method and device and a terminal. The method comprises the following steps: establishing a finite element model of a cross-fault tunnel-surrounding rock; based on the dual-objective optimization function of the seismic wave, determining the separation frequency of a fault movement component and a seismic oscillation component in the current seismic wave, and obtaining fault movement component data and seismic oscillation component data from the seismic wave in the simulation area; the fault movement component data and the seismic movement component data are converted into equivalent seismic loads; and applying the equivalent seismic load to the finite element model for finite element calculation, and determining the seismic response rule of the tunnel lining under the action of the seismic motion field and the fault displacement field. According to the method, the optimal separation frequency of the seismic oscillation component and the fault movement component is determined by using the dual-objective optimization function, so that the influence of different seismic wave components on the tunnel structure is researched, and a reference basis is provided for adopting targeted anti-seismic measures for tunnel seismic resistance.

The embodiment of the invention discloses an efficient response spectrum method for soil-structure interaction anti-seismic analysis. The efficient response spectrum method comprises the steps that a finite element model of a to-be-analyzed soil-structure system is obtained; performing modal analysis on the structure model under the rigid foundation, and calculating the effective inherent frequency and modal vector of each order of the soil-structure system; according to the effective inherent frequency and the modal vector of each order, calculating a modal participation coefficient of each effective modal and a cross correlation coefficient between the effective modals; a model bottom response spectrum is obtained according to earthquake risk analysis of a specific site, and for an engineering site without earthquake risk analysis of the specific site, the model bottom response spectrum is obtained through inversion of a ground surface design spectrum through an inversion method; and determining the peak response of the structure according to the bottom response spectrum of the model. According to the embodiment of the invention, soil-structure interaction is considered in the structural seismic analysis response spectrum method, and the execution efficiency is relatively high.

The invention discloses a method for predicting a favorable sand body in a less-well area based on sedimentary numerical simulation and comprehensive well shock, and relates to the technical field of oil-gas exploration and development. Based on logging, shock and core data, a sedimentary facies is depicted, a sedimentary system is defined, and a basic structure-sedimentary environment is constructed; the method comprises the following steps: defining a containing space parameter, a material source supply parameter and a carrying parameter by utilizing a sedimentary ancient landform, lake plane elevation, tectonic settlement and a material source system, and establishing an initial sedimentary forward modeling model; and comparing the simulation result of the initial deposition forward modeling model with the underground actual geological information of the area with less wells point by point and layer by layer, and evaluating the correlation degree of the simulation result and the actual geological condition. According to the method, the theoretical basis of favorable sand body prediction is provided, the uncertainty of single attribute prediction is eliminated, the precision of favorable sand body prediction in the well-deficient area is improved, and a technical method and the theoretical basis can be provided for favorable sand body prediction in numerous sedimentary basin well-deficient areas.

The invention discloses a reservoir water fluctuation propagation direct numerical simulation method and device in gravity dam anti-seismic analysis, a medium and equipment. According to the method, fluctuation propagation in reservoir water under combined incidence of P waves and SV waves is considered, a reservoir water-foundation site free field is analyzed and calculated on the basis of the fluctuation theory and the potential function theory, then the site free field is converted into node counterforce on fluid and solid boundaries on the basis of a fluid and solid power artificial boundary substructure model, and the reservoir water-foundation site free field is obtained. Applying node counterforce on the reservoir water-foundation artificial boundary, and directly performing numerical simulation on reservoir water-foundation site free field response; based on a static-dynamic artificial boundary conversion method, considering the influence of the static effect of the gravity dam-reservoir water-foundation system on the dynamic effect of the system, and constructing a gravity dam seismic oscillation input model for directly simulating reservoir water fluctuation propagation; according to the method, the anti-seismic analysis precision of the gravity dam is improved, and the limitations of single-wave incidence during reservoir water fluctuation propagation simulation, failure to consider the static effect and the like are overcome.

The invention discloses a ground vibration simulation method, system and device and a medium, and relates to the field of seismic analysis, and the method comprises the steps: obtaining a plurality of seismic oscillation records; performing data filling on each seismic oscillation record by adopting a random finite fault method to obtain a plurality of sample seismic oscillation records; determining a plurality of condition parameters of each sample seismic oscillation record to obtain a multi-label vector of each sample seismic oscillation record; constructing a seismic oscillation simulation model based on the conditional denoising diffusion probability model, each sample seismic oscillation record and the multi-label vector of each sample seismic oscillation record; and carrying out seismic oscillation simulation under different seismic scenes based on the seismic oscillation simulation model. According to the invention, the complexity of the ground motion simulation model is reduced, and the precision of ground motion simulation is improved at the same time.

The invention provides an underground structure vulnerability analysis method, device and equipment and a storage medium, and relates to the technical field of underground structure anti-seismic analysis. The method comprises the following steps: establishing a regional geophysical model by setting attributes of a seismic source, attributes of an underground structure, attributes of a soil layer and a finite fault type; calculating seismic oscillation data corresponding to a plurality of nodes of different dimensions of the regional geophysical model by using a finite difference method; a target probability seismic demand model is determined based on the seismic oscillation data, and interlayer displacement angle limit values under different performance levels are obtained by performing push-and-cover analysis on the underground structure; and drawing a vulnerability curve based on the target probability seismic demand model and the inter-layer displacement angle limit value. According to the method, the device and the equipment for analyzing the vulnerability of the underground structure and the storage medium provided by the invention, the seismic oscillation data is acquired by considering various factors such as the geological environment of the underground structure and the seismic source attribute, and the accuracy of the vulnerability analysis of the underground structure is improved.

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.

This invention provides a method for characterizing sedimentary microfacies distribution based on comprehensive geological and seismic analysis. By studying the sedimentary environment and surrounding tectonic background of the entire block, this invention calculates the cumulative percentage of channel and shoal body types based on sedimentary microfacies and grain size analysis. Based on a comprehensive analysis of the lithofacies of drill cores and corresponding well logging curves and seismic response characteristics, it establishes a comprehensive response model of the main sedimentary facies-well logging facies of the target stratigraphic group in the study area. Furthermore, based on the fusion of seismic attributes, it characterizes sand bodies in seismic profiles. By integrating the sand body characterization results, the comprehensive response model of sedimentary facies-well logging facies, and the sedimentary microfacies types, a method for characterizing sedimentary microfacies distribution in tight sandstone reservoirs using comprehensive seismic and geological analysis is established.

The present invention discloses a method for characterizing the configuration boundary type of a lake bottom fan reservoir constrained by a sequence stratigraphic framework, comprising the following steps: acquiring three-dimensional seismic data of a lake bottom fan reservoir; using the three-dimensional seismic data of the lake bottom fan reservoir to construct a sequence stratigraphic framework by combining wells and seismic data; using the three-dimensional seismic data of the lake bottom fan reservoir and the sequence stratigraphic framework to constrain the top and bottom interfaces of the lake bottom fan reservoir; based on the top and bottom interfaces of the lake bottom fan reservoir, calculating the amplitude change rate, thickness change rate, and top surface structural change rate of the seismic attribute of the lake bottom fan reservoir; characterizing the configuration boundary type of the lake bottom fan reservoir based on the amplitude change rate, thickness change rate, and top surface structural change rate of the seismic attribute of the lake bottom fan reservoir. By adopting an analysis method combining wells and seismic data, the rich three-dimensional seismic information is fully utilized to constrain the reservoir configuration boundary characterization, which makes up for the deficiency of the configuration analysis method based on well information under the condition of sparse well network at sea, effectively reduces the uncertainty of reservoir configuration boundary prediction, and improves the prediction efficiency of reservoir configuration boundary prediction.

The invention discloses a seismic response analysis method for a magnetic levitation line axle coupling system with a seismic isolation support. The method comprises the steps that a motion equation of the magnetic levitation line axle coupling system considering nonlinear mechanical behaviors of the seismic isolation support under the seismic action is constructed; and solving the motion equation by considering equivalent linearization and separation iteration to obtain the dynamic response of the maglev line vehicle and the bridge. According to the method, a bridge model considering the nonlinear hysteresis behavior of the seismic isolation support and a magnetic track interaction model based on PID active control are established, and unified seismic analysis is carried out on strong nonlinear energy consumption of the seismic isolation support and specific active control dynamics of a magnetic levitation vehicle; the problem that an existing universal axle coupling analysis method cannot be directly applied to the complex system is solved.

The RC column concentrated plastic hinge model research method based on lateral stiffness relates to the structural seismic technology field; the method aims to solve the problem that the simulation precision of the existing concentrated plastic hinge model is influenced by the value of the multiplier n, and the function relationship between the spring rotation stiffness and the component lateral stiffness is established, without defining the multiplier n; the specific steps include deducing the concentrated plastic hinge series model unit stiffness matrix of the cantilever column, establishing the function relationship between the rotation stiffness and the lateral stiffness, designing the state updating algorithm based on the displacement loading control, verifying the accuracy of the new model, and comparing the precision of the existing model; the experimental results show that the simulation precision of the model is improved significantly, the nonlinear behavior of the RC column can be accurately simulated without the multiplier n, and the method has important practical significance; the method has been successfully applied to the seismic analysis of a plurality of typical RC frame structures, not only simplifies the calculation process, but also improves the calculation efficiency, provides a more reliable and convenient tool for the structural seismic design, and has high popularization value.

This application discloses a well-seismic analysis system, method, and equipment based on a tight sandstone geomechanical coupled lithofacies system, relating to the field of tight sandstone oil and gas extraction analysis. The system employs a four-element composite triangular diagram method in its classification model construction module to construct a geomechanical coupled lithofacies classification model for tight sandstone reservoirs based on information data. The integration module performs geomechanical coupled lithofacies classification and integrates multi-type lithofacies prediction results at the single-well level based on element difference data. The analysis and determination module, based on a well-seismic collaborative three-dimensional model of the tight sandstone reservoir's geomechanical coupled lithofacies, performs feature extraction, lithofacies classification feedback adjustment, and seismic attribute mapping of the geomechanical coupled lithofacies to determine the distribution information data of the tight sandstone geomechanical coupled lithofacies. This application can determine the heterogeneous distribution law of rock mechanics and geostress characteristics in tight sandstone reservoirs, providing a basis for improving the extraction efficiency of tight sandstone oil and gas.

The present invention provides a method and device for generating equivalent static force of seismic response spectrum of marine engineering structure, which relates to the technical field of seismic analysis of marine engineering structure, including: establishing a main finite element model and a nonlinear pile pipe structure finite element model of the marine engineering structure according to building data, and performing nonlinear static analysis processing by presetting a static reduction method model to reduce the stiffness matrix and mass matrix of the nonlinear pile pipe structure and determine the pile head super unit finite element model; combining the main finite element model and the pile head super unit finite element model to determine the target model, and performing modal analysis processing on the target model by inputting the seismic response acceleration spectrum in the horizontal direction into the target model to determine the seismic equivalent static force in the specified direction. The present invention accurately calculates the seismic equivalent static force of the marine engineering structure based on the modal response, which can significantly improve the safety and stability of the marine engineering structure under the action of earthquake.

The invention belongs to the technical field of curtain walls, and particularly relates to a forming process for irregular modeling of curtain wall petals, which comprises the following steps: a designer and a curtain wall engineer closely cooperate, and the modeling of the curtain wall petals is deeply designed by utilizing computer-aided design and computer-aided engineering software based on a building design drawing; the processing technology, the installation sequence and the structural rationality are fully considered, and the feasibility of the design scheme is ensured; performing wind pressure and anti-seismic analysis on the petals of the curtain wall according to the design scheme; and an accurate three-dimensional model of the curtain wall petals is established, and data export is performed on the established three-dimensional model. According to the method, deepening design and digital modeling are carried out by adopting various software, and the structure is simulated, analyzed and optimized by virtue of the three-dimensional model, so that the design precision is ensured, the material waste and the processing difficulty can be reduced, and the high requirement of irregular modeling on the design precision is met.

The invention discloses a pile head spring stiffness matrix iteration method for jacket platform seismic analysis, and the method comprises the steps: building a three-dimensional structure model of a jacket platform, simulating a seismic load in a manner of applying an acceleration field, carrying out the structural static analysis calculation, building a jacket structure analysis model copy, and judging the reasonability of a pile head spring stiffness matrix. After a reasonable pile head spring stiffness matrix is obtained, the model can be adopted to complete the subsequent structural strength check of the jacket platform under the action of the seismic load. According to the method, in the process of determining the pile head spring stiffness matrix through jacket platform earthquake analysis, designers do not need to determine the size and the application position of a concentrated point load according to experience, and the problems of calculation complexity, efficiency and the like are solved. According to the method, the seismic load is simulated by applying the acceleration field to the platform model, iterative calculation can be completed more conveniently, more accurately and more quickly, a reasonable and accurate pile head spring stiffness matrix is generated, and then seismic analysis calculation of the jacket platform is achieved.

This invention discloses a method, apparatus, and equipment for determining formation thickness based on combined gravity and seismic data. The method includes: extracting the vertical derivative of the Bouguer gravity anomaly in the target basin; regularizing the vertical derivative of the Bouguer gravity anomaly to obtain a regularized value; determining the formation thickness at several well points and in three-dimensional regions within the target basin based on seismic and well data; and establishing a formation thickness prediction function for the target basin based on the regularized value of the vertical derivative of the Bouguer gravity anomaly and the formation thicknesses at several well points and in three-dimensional regions, thereby determining the formation thickness of the entire target basin based on the formation thickness prediction function. This method not only reduces the uncertainty of difference caused by data sparsity when using only seismic data but also solves the drawback of existing gravity interface inversion techniques lacking seismic constraints.