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36 results about "Aftershock" patented technology
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An aftershock is a smaller earthquake that follows a larger earthquake, in the same area of the main shock, caused as the displaced crust adjusts to the effects of the main shock. Large earthquakes can have hundreds to thousands of instrumentally detectable aftershocks, which steadily decrease in magnitude and frequency according to known laws. In some earthquakes the main rupture happens in two or more steps, resulting in multiple main shocks. These are known as doublet earthquakes, and in general can be distinguished from aftershocks in having similar magnitudes and nearly identical seismic waveforms.
Transmission tower earthquake damage assessment and emergency response method and system based on multi-source data fusion
The invention discloses a multi-source data fusion-based power transmission tower earthquake damage assessment and emergency response method and system. The method comprises the steps of collecting and preprocessing multi-source data of geological disasters of a power transmission tower; constructing a multi-modal fusion-digital twinborn driven dynamic transmission tower earthquake damage evaluation model, and evaluating the preprocessed multi-source data; and generating a corresponding emergency response strategy based on the evaluation result. According to the method, the multi-source data of the geological disaster of the power transmission tower is analyzed and processed by using the multi-modal fusion-digital twinning driven dynamic power transmission tower earthquake damage assessment model, so that the current damage can be comprehensively assessed according to the multi-source data, the evolution trend under aftershock and secondary disaster can be accurately predicted, and prospective early warning is realized.
Owner:BAISE BUREAU OF EHV TRANSMISSION CO OF CHINA SOUTHERN POWER GRID CO LTD
Slope stability evolution prediction method for cumulative damage mechanism of main shock sequence and aftershock sequence
The invention relates to the technical field of slope stability prediction, in particular to a slope stability evolution prediction method of a main shock and aftershock sequence cumulative damage mechanism. The method comprises the following steps: determining an initial strength parameter of a slope sliding surface rock-soil body and a dynamic strength attenuation parameter under the action of a main shock and aftershock sequence through an indoor cyclic load test, and establishing a cumulative damage model; three-dimensional side slope geometric features are obtained, and the spatial orientation and the stress direction of a potential sliding surface are determined; calculating a dynamic sliding force in combination with seismic oscillation parameters, and updating an effective strength parameter and a dynamic anti-sliding force of the sliding surface in real time; and carrying out staged calculation and dynamic evolution analysis by adopting a limit equilibrium method or a strength reduction method. According to the method, by introducing a rock-soil body strength accumulated damage and progressive attenuation mechanism under the cyclic action of the main and aftershock sequences, the damage accumulation process and the stability evolution law of the slope stability along with the development of the main and aftershock sequences are described, so that the progressive instability process and the accumulated instability risk driven by the aftershock after the main shock is triggered can be identified.
Owner:ANHUI UNIV OF SCI & TECH
Main shock and aftershock type seismic oscillation dimensionality reduction simulation method based on engineering characteristics
PendingCN121115106ADesign optimisation/simulationSeismic signal processingDimensionality reductionClassical mechanics
The invention provides a main shock and aftershock type seismic oscillation dimensionality reduction simulation method based on engineering characteristics, and the method comprises the steps: determining simulation parameters of a main shock, and obtaining corresponding aftershock parameters through the main shock parameters based on an attenuation model of the main shock and aftershock parameters; based on the main earthquake parameters and the aftershock parameters, fully non-stationary evolution power spectrum models of the main earthquake and the aftershock are established respectively, and the fully non-stationary evolution power spectrum models reflect the non-stationary characteristics of earthquake oscillation; discretizing the requirements of the established main shock and aftershock fully non-stationary evolution power spectrum model for random variables by adopting a number theory point selection mode to obtain a representative point set of basic random variables; substituting the representative point set into a random function to obtain an orthogonal random variable set which can be used for simulation; obtaining a representative sample set of the main shock and aftershock process based on an orthogonal random variable set by using a spectrum representation theory; and through the representative sample set, generating seismic oscillation time history samples of the main shock and the aftershock, and outputting a simulation result.
Owner:CHINA THREE GORGES UNIV
A real-time early warning method for secondary collapse risk of RC frame semi-ruin structure under aftershock
The present application relates to the field of earthquake site rescue warning, and relates to a real-time early warning method for secondary collapse risk of RC frame semi-rubble structure under aftershock. The core content of the method includes four modules. Module 1: using the method of seismic simulation shaking table, the whole process of RC frame structure from perfect to semi-rubble to secondary collapse is realized by simulating main-aftershock action, and time history data of dynamic response of secondary collapse structure is obtained. Module 2: high-dimensional continuous horizontal moving time window method is used to process the time history data of dynamic response of structure and obtain the dynamic response characteristics of RC frame semi-rubble secondary collapse structure. Module 3: K-Means machine learning algorithm is used to cluster the secondary collapse risk type of RC frame semi-rubble structure. Module 4: Informer machine learning algorithm is used to realize real-time early warning of secondary collapse risk of RC frame semi-rubble structure. The present application can scientifically and accurately distinguish and real-time predict the secondary collapse risk of RC frame semi-rubble structure under aftershock.
Owner:TONGJI UNIV +1
A main aftershock induced slope slip prediction method based on multi-parameter regression
The application discloses a main aftershock induced slope slip prediction method based on multi-parameter regression, aims to utilize a large amount of ground motion data and a Newmark rigid block method to construct an explicit expression for predicting permanent slip displacement of a slope under the action of a main aftershock from peak ground acceleration, peak velocity and slope yield acceleration. The method comprises the following steps: step 1, selecting ground motion data from a ground motion database NGA-West2 and calculating each ground motion parameter and the slope slip displacement under different slope yield accelerations; step 2, identifying optimal ground motion parameters according to effectiveness criteria and applicability criteria; step 3, obtaining a plurality of prediction models through optimal parameters and a multi-parameter nonlinear regression analysis method and then testing the prediction performance to determine a final slip prediction model; and step 4, predicting the permanent slip displacement of the slope under a given seismic scenario and slope condition. Based on the method, the application develops and discloses a main aftershock induced slope slip prediction model with good accuracy, universality and practicability, and has certain guiding significance for slope stability evaluation and seismic design under the action of a main aftershock.
Owner:WUHAN UNIV
Offshore housing unit
To solve the problem that it is difficult for residents who cannot live in a house due to an earthquake, a tsunami, a fire, or the like to secure a lodging place for a restoration worker because the residents cannot go to a house with electricity and water while being safe against an aftershock and a tsunami and protecting privacy.SOLUTION: A wooden artificial island is floated on the sea adjacent to the land, a plurality of dwellings are installed on the wooden artificial island, and the wooden artificial island is fixed by setting a concrete guide on the sea adjacent to the land, passing a log connected to the wooden artificial island through the concrete guide, and stopping the wooden artificial island with two wooden stoppers so that the wooden artificial island does not move in the horizontal direction (left, right, front, and back) but can move in the vertical direction to cope with the ebb and flow of the tide.SELECTED DRAWING: Figure 1
Owner:廣田祐次
Intelligent earthquake monitoring system based on Internet of Things
The invention relates to the technical field of earthquake monitoring, in particular to an intelligent earthquake monitoring system based on the Internet of Things. The adaptive optimization module is used for dynamically generating an aftershock probability density field; the adaptive optimization module is used for configuring a stress release relaxation factor based on a sequence active modal index calculated by a kurtosis characteristic value and a skewness characteristic value of probability space distribution in a current time slice to obtain a primary iteration aftershock probability density field; the structure-oriented constraint adjusting module is used for adjusting the structure-oriented constraint weight based on the deviation degree of the main axis direction of the high-probability aftershock cluster and the fault trend of the known region to obtain a secondary iteration aftershock probability density field; and the aftershock risk assessment module is used for determining whether the reliability of the secondary iteration aftershock probability density field is qualified or not based on the width of the confidence interval of the aftershock occurrence rate, and optimizing the preset active index based on an unqualified condition. The aftershock probability prediction precision is improved.
Owner:HUANGHE S & T COLLEGE
Maximum aftershock prediction method based on online enhancement
The invention discloses a maximum aftershock prediction method based on online enhancement, and belongs to the technical field of earthquake prediction. The core of the method is that a personalized prediction model is dynamically generated for a current event through online retrieval of similar historical sequences and data enhancement aiming at a newly occurring main earthquake. Firstly, a historical seismic database is constructed from a global seismic directory, and an initial prediction model is trained. When a new main earthquake occurs, an online process is triggered immediately: based on the characteristics of the new main earthquake, K most similar sequences are quickly retrieved from historical data; then, the similar sequence data are enhanced (such as noise adding and interpolation), so that a diversified enhanced training set is constructed; and finally, performing rapid fine adjustment on the initial model by using the enhancement set to obtain an optimization model for the current main earthquake, and predicting the maximum aftershock magnitude. According to the method, the limitation of one-time cutting of the existing static model is overcome, the problem of inaccurate prediction in an earthquake small sample scene is effectively solved, and the accuracy, robustness and timeliness of prediction are remarkably improved.
Owner:GUILIN UNIV OF ELECTRONIC TECH
A deep dimension reduction simulation system and method for time-frequency feature fusion of main aftershock sequence
The application relates to the field of data processing, and discloses a main aftershock sequence time-frequency feature fusion deep dimension reduction simulation system and method, wherein the main aftershock sequence time-frequency feature fusion deep dimension reduction simulation method comprises the following steps: adaptively segmenting original waveform data from multiple seismic monitoring nodes according to a non-fixed window; performing cross-window aggregation on local amplitude anomalies and burst energy features existing in preliminary sequence representation; dynamically mapping potential aftershock signals and main shock features by constructing a bidirectional association network; iteratively fusing feature differences in a response evolution diagram and node distribution information; introducing a hierarchical dimension reduction processing mechanism based on a digital constraint model, and performing selective compression on signal modes of different granularities; and dynamically comparing and weighting integrating sequence features of different time segments by using an index system. The application has the advantage of improving the real-time performance of large-scale seismic data processing.
Owner:SEISMOLOGICAL BUREAU OF GANSU PROVINCE CHINA EARTHQUAKE ADMINISTRATION
A vector main aftershock risk analysis model construction and early warning method and system
The application provides a vector primary aftershock risk analysis model construction and early warning method and system, establishes a primary aftershock database of a target engineering structure; at least one characteristic signal related to each primary aftershock is obtained from the primary aftershock database; data analysis is performed on the target engineering structure by using the characteristic signal, and each analysis result is obtained; each analysis result is combined and calculated to determine a vector primary aftershock vulnerability surface and a vector primary aftershock danger surface; the vector primary aftershock vulnerability surface and the vector primary aftershock danger surface are integrated and calculated to determine a vector primary aftershock risk analysis model. The problem that a traditional earthquake risk analysis process cannot consider aftershock events is solved, and a three-dimensional primary aftershock risk surface is obtained. The vector primary aftershock risk analysis method can be used to establish a risk analysis model of a target engineering site under the action of a primary aftershock sequence and evaluate the earthquake risk of the target engineering site under the action of the primary aftershock sequence.
Owner:GUILIN UNIVERSITY OF TECHNOLOGY
Depth dimension reduction simulation system and method based on time-frequency feature fusion of main shock sequence and aftershock sequence
The invention relates to the field of data processing, and discloses a main shock and aftershock sequence time-frequency feature fusion depth dimension reduction simulation system and method.The main shock and aftershock sequence time-frequency feature fusion depth dimension reduction simulation method comprises the steps that original waveform data from a plurality of earthquake monitoring nodes are subjected to self-adaptive segmentation according to a non-fixed window; performing cross-window aggregation on local amplitude anomaly and burst energy features existing in the preliminary sequence representation, and performing dynamic mapping on potential aftershock signals and main shock features by constructing a bidirectional association network; carrying out iterative fusion on feature differences in the response evolution diagram and node distribution information; introducing a hierarchical dimension reduction processing mechanism based on the digital constraint model, and executing selective compression on signal modes with different granularities; and performing dynamic comparison and weighted integration on the sequence features of different time slices by using an index system. The method has the advantage of improving the real-time performance of large-scale seismic data processing.
Owner:SEISMOLOGICAL BUREAU OF GANSU PROVINCE CHINA EARTHQUAKE ADMINISTRATION
Slope vulnerability analysis method and system based on main aftershock sequence double-response index
The application provides a main aftershock sequence slope vulnerability analysis method and system based on double response indexes, relates to the technical field of earthquake slope vulnerability analysis, and comprises the following steps: constructing a GeoStudio slope model according to physical parameters of slope soil, obtaining an initial static safety factor and a critical acceleration of the slope; performing incremental dynamic time-history analysis according to main shock ground motion data, the slope model and the initial static safety factor of the slope, and obtaining shear strength parameter values of the soil after the main shock; updating the initial critical acceleration of the slope to obtain a critical acceleration of the slope after the main shock; performing aftershock incremental dynamic time-history analysis according to aftershock ground motion data and the critical acceleration of the slope after the main shock, and obtaining safety factor values and cumulative displacement results of the soil after the aftershock; and defining a vulnerability function based on a lognormal cumulative distribution function to obtain a multilevel slope vulnerability curve. The application improves slope risk assessment precision and visual decision-making capability.
Owner:SOUTHWEST JIAOTONG UNIV
Anti-seismic integrated house floor structure
ActiveCN223880679UProtective buildings/sheltersFlooring insulationsEarthquake resistanceArchitectural engineering
The utility model relates to the technical field of floors, in particular to an anti-seismic integrated house floor structure. The utility model provides an improved integrated house floor structure for seismic resistance. The floor structure comprises a limiting frame, an anti-skid plate, a damp-proof plate, buffering protection pieces and the like, a panel is placed between the inner side of the limiting frame and the top of a lifting frame, the anti-skid plate and the damp-proof plate are connected to the upper side and the lower side of the panel in a clamped mode respectively, and the buffering protection pieces used for resisting shock are arranged at the bottom of the lifting frame at intervals. The floor structure is formed by clamping and combining the panel, the anti-skid plate and the moisture-proof plate, so that the floor structure can be conveniently and quickly mounted between the limiting frame and the lifting frame to form a stable integral structure; and through the special buffering piece structure and the cooperation effect of the crisscrossed rubber strips and the base, the anti-seismic performance and the buffering protection capacity of the floor structure can be effectively improved, then impact force caused by an earthquake can be effectively absorbed and dispersed when the earthquake or aftershock occurs, and therefore the purpose of protecting the safety of residents is achieved.
Owner:SHENZHEN JINGGONGJIAN LIGHT STEEL HOUSING CO LTD
A Method and System for Constructing a 3D Model of Seismogenic Fault Based on Aftershock Precision Location Data
ActiveCN120686353BSatellite radio beaconingSeismic signal processingInformation processingEngineering
This invention belongs to the field of seismic information processing technology and discloses a method and system for constructing a three-dimensional model of seismogenic faults based on aftershock precision location data. The method includes: acquiring seismic geological data of the study area; establishing a high-resolution three-dimensional crustal velocity model of the study area and determining precise source parameters; obtaining tectonic stress field characteristics through source mechanism solutions and GNSS observation data; and studying the seismogenic mechanism of the study area and obtaining information on potential strong earthquake hazards. This invention combines two grid intervals, 0.2°×0.2° and 0.1°×0.1°, to obtain both the velocity structure of the non-source area with a 0.2°×0.2° grid interval and the velocity structure of the source area with a 0.1°×0.1° grid interval. This is suitable for studying the velocity structure of source areas with a relatively small number of stations.
Owner:GUANGDONG SEISMOLOGICAL BUREAU
Method and device for pre-earthquake reinforcement and post-earthquake damaged area determination of fabricated building
The invention discloses a pre-earthquake reinforcing and post-earthquake damaged area determining method and device for a fabricated building. The method comprises the steps that a plurality of natural seismic wave vibration curves of main earthquakes and afterearthquakes are decomposed into a plurality of types of sub-vibration curves; obtaining a probability density function of each characteristic parameter of the sub-vibration curve; amplifying the number of the sub-vibration curves of each type to form an artificial seismic wave vibration curve of the main shock and the aftershock; inputting the seismic wave vibration curve into a structural dynamic analysis model to calculate a structural damage index; and establishing a mapping function relationship between the structural damage index and the seismic wave vibration curve characteristic parameters, and forming a probability density function of the structural damage index based on the generation probability value of the seismic wave vibration curve and the mapping function relationship. Recognizing a vulnerable area and reinforcing the vulnerable area based on the damage probability of the structural damage index before an earthquake; and outputting the layer-by-layer damage state of the building in real time through the mapping function relationship after the earthquake so as to quickly determine the damaged area. According to the invention, closed-loop management and control of pre-earthquake accurate defense and post-earthquake rapid assessment can be realized.
Owner:IN THE TUNNEL BUREAU OF THE SECOND ENG
An SMA plate damper and its seismic resistance method for self-resetting rocking structures
This invention discloses an SMA plate damper and its seismic resistance method for self-resetting rocking structures. The damper includes an SMA core plate, strip heating units, C-shaped strips, and a buckling restraint plate. The SMA core plate is martensitic and dumbbell-shaped with openings at both ends. The C-shaped strips are arranged on both sides of the SMA core plate along its thickness direction, extending in the same direction as the SMA core plate. Two strip heating units are respectively arranged in the narrow grooves of the two C-shaped strips and are in close contact with the SMA core plate. The C-shaped strips and the buckling restraint plate provide buckling restraint for the SMA core plate. This invention utilizes the unique temperature-performance relationship of SMA material to form a self-reinforcing SMA plate damper. When applied to a self-resetting rocking structure, it can enhance the structure's seismic resistance under the combined action of main and aftershocks.
Owner:SOUTHEAST UNIV
Anti-seismic composite damper based on self-healing-metal buckling-eddy current coupling
ActiveCN224199765UIncrease damping forceGuaranteed uptimeBridge structural detailsProtective buildings/sheltersCouplingClassical mechanics
The utility model discloses an anti-seismic composite damper based on self-healing-metal buckling-eddy current coupling. The anti-seismic composite damper comprises a connecting rod assembly, a damping wall assembly and a rotating support. The connecting rod assembly comprises a rigid connecting section, a slidable inserting section and a permanent magnet, and the rigid connecting section and the slidable inserting section form buckling guide fit through a preset path; the damping wall assembly is of a multi-layer composite structure and comprises a shell, a cooling layer and a magnetic conductive layer, and an inner cavity of the damping wall assembly wraps the connecting rod assembly to form a magnetic flux loop. The rotating support is provided with a rotating limiting structure, and the two ends of the rotating limiting structure are connected with the connecting rod assembly and an external structure correspondingly. According to the utility model, the elliptical cavity is preset in the plastic base body, and the elliptical cavity is broken to release the self-healing agent when the displacement of the connecting rod exceeds a threshold value; after the self-healing agent flows out, the self-healing agent chemically reacts with the plastic matrix to be cured into a solid, and displacement is hindered through mechanical occlusion; the phase change resistance generated in the curing process achieves self-adaptive adjustment of small-earthquake low resistance and large-earthquake high resistance, and the damping force can be remarkably enhanced during strong earthquakes and aftershocks.
Owner:CENT SOUTH UNIV
Post-earthquake building semi-ruin structure collapse probability prediction method based on image recognition and deep learning
The invention discloses a post-earthquake building semi-ruin structure collapse probability prediction method based on image recognition and deep learning. The method comprises the following steps of: (1) acquiring a building ruin image capable of representing key damage characteristics such as a concrete peeling area (S), a steel bar buckling degree (Y), a structure overall inclination angle (alpha), a component node cracking and local falling degree (F), ruin overall integrity and residual support degree (E) and the like through an unmanned aerial vehicle; (2) constructing a deep learning model CVCB-Net fusing a convolutional neural network, a visual Transform, a convolutional long-short term memory network and a Bayesian network; and (3) based on the quantized multi-dimensional damage characteristics, generating a collapse probability curve and risk distribution under different aftershock peak acceleration conditions by adopting Bayesian inference, and carrying out risk rating division. According to the method, non-contact, rapid and intelligent safety assessment of the post-earthquake semi-ruin structure can be realized, and a scientific basis is provided for emergency rescue and reinforcement decision during aftershock.
Owner:JILIN AGRICULTURAL UNIV
An aftershock swarm-based post-earthquake time-varying aftershock risk analysis method
The present application relates to the technical field of earthquake risk and earthquake damage prediction analysis, and particularly relates to a post-earthquake time-varying aftershock risk analysis method based on aftershock swarm, comprising the following steps: identifying parameters of an ETAS model by maximum likelihood estimation through earthquake catalog information; generating a large number of simulated aftershock swarm sequences based on the ETAS model; converting magnitude information of the simulated aftershock swarm sequences into ground motion intensity through a ground motion prediction equation; selecting a main aftershock sequence, solving aftershock vulnerability parameters under different damage states by maximum likelihood estimation, and performing damage state related aftershock vulnerability analysis; and performing post-earthquake time-varying aftershock risk analysis. The present application simulates the aftershock activity model of a site by using the ETAS model, forms a post-earthquake risk analysis model which can consider the action of multiple aftershocks after the main earthquake over time, and solves the defect that only a single main earthquake and a single aftershock can be considered in the existing earthquake risk analysis.
Owner:GUILIN UNIVERSITY OF TECHNOLOGY +3
Tunnel disaster monitoring method and blocking method based on earthquake damage-flood cooperation
The invention discloses a tunnel disaster monitoring method and blocking method based on earthquake damage-flood cooperation, and relates to the field of earthquake engineering and intelligent disaster prevention and control, and the method comprises the steps: carrying out the decoupling based on the DOFS data of a section, and obtaining a damage feature, a seepage feature and an aftershock feature; simulating to obtain water pressure data according to the multi-source sensing data in the section; based on each feature and historical data, determining a current damage variable, a damage-seepage coupling index and a fracture hydraulic opening degree; according to the water pressure value of each section, the seepage pressure gradient between the sections is determined, and the seepage velocity vector between the sections is determined by combining the fracture hydraulic opening degree and the damage-seepage coupling index of the sections; determining a system cascade failure risk index according to the damage variables of the sections and the dynamic risk propagation weight between the sections; and determining a disaster chain propagation intensity index of the current tunnel by using an entropy weight method. According to the invention, real-time monitoring and risk assessment of secondary flood disasters after tunnel earthquakes can be realized.
Owner:TONGJI UNIV
Aftershock prediction method, device and electronic equipment
This invention provides an aftershock prediction method, apparatus, and electronic device, comprising: acquiring an earthquake catalog and tidal stress of a region to be predicted within a preset time period, where an earthquake of a preset magnitude has occurred; dividing the region to be predicted into multiple sub-regions; determining a first loading / unloading response ratio generated by tidal stress within a first time window and a second loading / unloading response ratio generated by tidal stress within a second time window, based on the earthquake catalog, tidal stress, and multiple sub-regions; and determining the location of aftershocks in the multiple sub-regions based on the first and second loading / unloading response ratios. This method, by dividing the region to be predicted into blocks and calculating the loading / unloading response ratio of the region to be predicted for a period after an earthquake and the loading / unloading response ratio for a period before an earthquake, obtains the change in the loading / unloading response ratio, thereby predicting aftershocks and improving the accuracy and efficiency of aftershock prediction and location.
Owner:INST OF EARTHQUAKE SCI CHINA EARTHQUAKE ADMINISTATION +1
A simulated earthquake disaster relief training sloping building
ActiveCN224287682Ugood effectavoid damageCosmonautic condition simulationsSafety beltsArchitectural engineeringPreventing injury
This utility model provides a simulated earthquake post-disaster rescue training inclined tower, relating to the field of rescue training building technology. It includes: poured concrete, with a movable groove on one side of the top of the poured concrete, a slight vibration device installed inside the movable groove, and the training inclined tower mounted on top of the slight vibration device. A fixed groove is formed on the other side of the top of the poured concrete, and a fall arrestor is installed inside the fixed groove. This utility model uses the slight vibration device, along with two large lifting hydraulic rods on both sides, to slightly shake the connecting plate and the training inclined tower from both sides, simulating the effect of slight aftershocks after an earthquake, thus improving the effectiveness of rescue personnel's training. The fall arrestor, through the damper and spring's rebound force, cushions the rescue personnel from accidental falls during training, preventing injury caused by the large impact force of a fall.
Owner:CHINA CONSTR SEVENTH ENG DIVISION CORP LTD
Method for high resolution p and s wave velocity ratio time series inversion based on seismic travel times
The application relates to a method for high-resolution P and S wave velocity ratio time series inversion based on seismic wave arrival time, which comprises the following steps: S1, obtaining P wave and S wave arrival time difference data of a seismic pair; S2, performing linear relationship fitting on the P wave and S wave arrival time difference data to extract average wave velocity ratio of the seismic pair; S3, constructing an initial wave velocity ratio time series according to a seismic time of a seismic sequence; S4, constructing a time series inversion matrix and performing inversion solving on the time series inversion matrix to obtain a wave velocity ratio time series; S5, judging whether the wave velocity ratio time series is stable, if the wave velocity ratio time series is stable, then returning to S3 with time series unknown number plus one, and if the wave velocity ratio time series is not stable, then outputting the inverted wave velocity ratio time series. The application can more accurately reveal the dynamic change rule of the wave velocity ratio of a natural seismic zone or an artificial blasting area.
Owner:GUANGDONG LABORATORY OF SOUTHERN OCEAN SCIENCE AND ENGINEERING (GUANGZHOU)
A complex ground motion uncertainty quantification method and stochastic simulation system
PendingCN122133302ADesign optimisation/simulationProbabilistic CADLinear correlationEarthquake engineering
This application relates to the field of earthquake engineering and discloses a method for quantifying the uncertainty of complex ground motions and a stochastic simulation system. The method first identifies non-stationary ground motions, mainshock and aftershock sequences, and near-fault pulse ground motions that meet the requirements in measured ground motion records, and uses an evolved power spectral density model to identify their parameters. Then, based on Copula theory, a high-dimensional nonlinear correlation joint probability distribution model of the parameters is constructed. Simultaneously, a high-order Hermite polynomial model is established to achieve non-Gaussian transformation, and the autocorrelation function mapping relationship is derived to reproduce the non-Gaussian properties. In the simulation stage, by combining representative point set selection, POD spectral representation, and non-Gaussian mapping, non-Gaussian ground motion time history samples consistent with the characteristics of measured records are efficiently synthesized. This invention can accurately quantify and simulate the stochastic uncertainty of complex ground motions, improving the realism of the simulation samples and computational efficiency.
Owner:DALIAN UNIV OF TECH
A method for quantitatively evaluating overall damage of a building structure based on structural strain energy
The application discloses a kind of building structure integral damage quantification evaluation methods based on structural strain energy, establishes building structure elastic-plastic calculation model, and preliminary selects and secondly selects earthquake wave;The secondly selected earthquake wave is applied to building structure elastic-plastic calculation model to carry out elastic time-history analysis, and obtains earthquake wave;With the obtained earthquake wave, the main shock and main aftershock bidirectional excitation is carried out to building structure elastic-plastic calculation model, and IDA curve is drawn;Draw IDA curve family diagram, percentile curve diagram, building structure capacity curve diagram and energy time-history curve diagram under the action of main shock and main aftershock, etc. Basic calculation parameters are calculated by formula to obtain building structure integral damage index based on structural strain energy, and the integral damage of building structure is quantitatively evaluated. The evaluation method can relatively sensitively reflect the damage degree of structure, and can also better make up for the one-sidedness of the damage model in the prior art using single displacement or force concept-based failure criterion to evaluate the integral damage and failure mechanism of structure.
Owner:GANSU URBAN & RURAL PLANNING & DESIGN RESEARCH INSTITUTE CO LTD
Pre-earthquake reinforcement and post-earthquake damaged area determination method and device for fabricated building
ActiveCN121118591BMathematical modelsBiological modelsArchitectural engineeringStructural engineering
Owner:IN THE TUNNEL BUREAU OF THE SECOND ENG
Anti-seismic device of high-voltage power transmission tower foundation
The invention relates to the technical field of anti-seismic of power transmission towers, and discloses an anti-seismic device of a high-voltage power transmission tower foundation, which comprises a semi-sphere fixedly connected to the outer wall of a supporting plate, and a plurality of elliptical semi-spheres are fixedly connected to the inner wall of a concrete base; as the semi-sphere and the elliptical semi-sphere are arranged at the joint of the supporting plate of the electric tower body and the concrete base, and meanwhile, the concrete base and the electric tower body are loosened, after aftershock arrives, the aftershock firstly acts on the concrete base, so that the concrete base vibrates to generate relative displacement with the electric tower body; and then certain relative displacement is generated between the elliptical hemisphere and the semi-sphere, so that the semi-sphere moves along the outer wall of the elliptical hemisphere, the supporting plate is far away from the concrete base, a gap generated between the concrete base and the supporting plate is supported open, and through the movement mechanism, aftershock does not directly act on the electric tower body, so that the electric tower body is protected. The aftershock influence on the electric tower body is reduced, and the shock resistance of the electric tower body in aftershock is enhanced.
Owner:CHENGDU LINGFENG TOWER MFG CO LTD
High arch dam earthquake vulnerability analysis method and system considering main and aftershock sequence working conditions
PendingCN121637881ADesign optimisation/simulationSpecial data processing applicationsElement modelArchitectural engineering
The invention discloses a high arch dam earthquake vulnerability analysis method and system considering main and aftershock sequence working conditions, and the method comprises the steps: taking obtained concrete material parameters and main and aftershock earthquake actions suffered by a high arch dam as input data, inputting the input data into a constructed high arch dam finite element model, and outputting a dynamic response result of the high arch dam, seismic oscillation intensity parameters and engineering demand parameters under the action of the main and aftershocks are obtained; constructing a damage grade and a limit state of the high arch dam under the action of the main and aftershocks, and establishing a vulnerability analysis model of the high arch dam under the action of the main and aftershocks; taking the seismic oscillation intensity parameters and the engineering demand parameters under the action of the main and aftershocks as vector parameters, and establishing a probability demand model; and obtaining a high arch dam vulnerability analysis result based on the probability demand model and the high arch dam vulnerability analysis model under the action of the main and aftershocks. According to the method, the numerical simulation process is simple, the calculation efficiency is high, and the vulnerability difference and damage effect of the high arch dam under the earthquake action of single main earthquake and main aftershock are revealed.
Owner:WUHAN UNIV
A monitoring and early warning system for secondary collapse of buildings under aftershocks
The application relates to a secondary collapse monitoring and early warning system for a building under aftershock, which comprises a building structure monitoring module and an early warning module; the building structure monitoring module comprises a plurality of sensors, the sensors are installed at local collapse building target monitoring points, and are used for monitoring the structural response of the local collapse building under aftershock; the early warning module is provided with a dynamic early warning threshold algorithm, different initial early warning thresholds are set according to the characteristic collapse mode of the local collapse building on site, and accurate and timely early warning is provided after data screening processing and sensitivity analysis are carried out by collecting aftershock source signals and structural response signals, meanwhile, the collapse early warning threshold is dynamically updated and is used for collapse judgment and early warning next time. Compared with the prior art, the application considers two factors of aftershock and structural response, and through the dynamic iterative early warning threshold, the monitoring and early warning of the secondary collapse of the building can be more scientific and accurate.
Owner:TONGJI UNIV
Seismic activity degree factor extraction method and system based on seismic data
PendingCN122307680ASeismic engineeringAftershock
This application provides a method and system for extracting seismic activity factors based on seismic data, relating to the field of earthquake engineering technology. The method obtains effective seismic event sets by acquiring seismic data of a target area and performing magnitude screening and aftershock removal. It then acquires a hierarchical source region model and extracts three-level polygon boundary data: statistical region, tectonic region, and tectonic source. Based on the epicenter location and magnitude parameters of each earthquake in the effective seismic event set, spatial fusion is performed within the spatial range defined by the polygon boundary data to generate an activity horizontal distribution layer. The activity horizontal distribution layer is spatially overlaid with the polygon boundary data to extract the cumulative activity within each level of polygon boundary. Finally, the cumulative activity is amortized according to the actual area of each level of polygon to obtain and output the seismic activity factor, thus improving the accuracy and spatial resolution of quantitative seismic activity assessment.
Owner:SHANDONG LUZHEN TECHNOLOGY ENGINEERING CO LTD +1