8 results about "Seismic hazard" patented technology

The application discloses a strong ground motion risk assessment method and system fusing multi-source data, relates to the technical field of multi-source data fusion, and calculates the time offset relationship of a satellite positioning sequence Gns and a radar deformation sequence Ins relative to a unified time reference Tref by using the unified time reference Tref, and performs time correction processing on a multi-source original set Dor by constructing a time offset matrix Tmx, so that a corrected data set Dsc with a unified time structure is formed. Fusion analysis is performed on the corrected data set Dsc to form a fusion feature set Fus, and the vibration propagation relationship is calculated based on the fusion feature set Fus to obtain a propagation path Pth, and finally, a risk result Rsk and a corresponding risk level Lev are output. The problem of misjudgment of the vibration propagation order caused by the time record difference of different observation systems can be avoided, and more reliable data basis is provided for earthquake disaster warning and emergency decision-making.

The invention relates to an RSM-based bridge anti-seismic multi-objective optimization method, equipment, a medium and a program product, and belongs to the technical field of bridge engineering anti-seismic design. The method comprises the following steps: determining design parameters and value ranges of bridge piers; designing a test by adopting a CCD method; establishing a finite element model; establishing a vulnerability curve; establishing an earthquake risk curve; the anti-seismic reliability is calculated through a PEER total probability anti-seismic risk assessment framework, the seismic oscillation randomness and the structural parameter uncertainty can be comprehensively considered, and the scientificity and the reliability of a subsequent optimization result are ensured; constructing an anti-seismic RSM model and each coefficient estimation value; and carrying out multi-objective optimization analysis by adopting an NSGA-II algorithm. According to the method, the problem that the calculated amount is too large in traditional anti-seismic optimization design is effectively solved, the optimization efficiency is remarkably improved while the precision is guaranteed, balance optimization of the anti-seismic reliability and the construction cost is achieved, the method has important practical value for improving the anti-seismic performance of the bridge and reducing the engineering construction cost, and multiple feasible optimization schemes are provided for engineering design.

This invention discloses a water-injection-induced earthquake monitoring and fault activation detection system, belonging to the field of earthquake monitoring and fault activation detection. The method includes: an earthquake observation module for obtaining earthquake monitoring data; a seismic phase data extraction module for identifying microseismic events based on the earthquake monitoring data to obtain seismic phase data; an initial earthquake location module for obtaining an initial earthquake catalog; a fine earthquake location module for performing secondary location to obtain a finely located earthquake catalog; a fault and structure modeling module for integrating the finely located earthquake catalog into a three-dimensional geological structure model for spatial location and visualization of seismic activity; and a fault activation and seismic hazard analysis module for analyzing the temporal variation trend of seismic activity, b-value changes, fault activation, and seismic hazard based on the three-dimensional geological structure model. This invention solves the problem of existing methods lacking monitoring capabilities for fault activation and weakening in shale gas development areas, as well as water-injection-induced earthquakes.

The application discloses a structural seismic optimization design method, belonging to the field of civil engineering and seismic design, and comprising the following steps: step 1, selecting a representative seismic intensity based on a site seismic hazard curve; step 2, obtaining layer stiffness and layer shear strength of an initial building; step 3, establishing a multi-degree-of-freedom layer model by using OpenSees software; step 4, evaluating component damage and economic loss by using a HAZUS database; step 5, constructing a cost constraint model and an equivalent implementation; step 6, jointly optimizing the shear strength and stiffness of each layer of the structure by using a particle swarm optimization algorithm; and step 7, outputting the optimization result: outputting optimal layer shear strength and stiffness distribution. The application realizes the reduction of economic loss under the premise of ensuring that the construction cost is unchanged by combining site hazard, component damage and loss evaluation and a swarm intelligent algorithm.

The invention provides a dam body earthquake damage risk assessment method, system and equipment, and the method comprises the steps: constructing a numerical model of an assessment object dam body for calculation, and analyzing the relation between the dam body damage degree and the earthquake intensity under different structure damage indexes through a logarithmic distribution function model and an incremental dynamic method; predicting the probability of each earthquake magnitude in the future based on earthquake damage historical data of the region where the dam body is located and a Monte Carlo method; coupling the relationship between the dam body damage degree and the earthquake intensity and the probability of occurrence of each earthquake in the future, and calculating the risk probability of the dam body facing different damage degrees in the future; based on a cloud model algorithm, evaluating the importance of different structural damage indexes in earthquake damage risk assessment, and calculating a dam body earthquake damage risk comprehensive probability; finally, the dam body earthquake damage risk is evaluated through the dam body earthquake damage risk comprehensive probability, the cloud model theory is introduced, index weight analysis is carried out through the processing uncertainty and the data conversion capacity of the cloud model theory, and earthquake damage risk evaluation of the dam body is improved and optimized.

An anti-seismic optimization design method for a structure belongs to the field of civil engineering and anti-seismic design, and comprises the following steps: step 1, selecting representative seismic intensity based on a field seismic risk curve; step 2, acquiring the layer stiffness and the layer shear strength of the initial building; step 3, establishing a multi-degree-of-freedom layer model by adopting OpenSees software; step 4, evaluating component damage and economic loss by adopting an HAZUS database; 5, constructing a cost constraint model and realizing equivalence; step 6, carrying out joint optimization on the shear strength and rigidity of each layer of the structure by adopting a particle swarm optimization algorithm; and 7, outputting an optimization result: outputting the optimal layer shear strength and rigidity distribution. According to the method, the economic loss is reduced on the premise of ensuring that the construction cost is not changed by combining site danger, component damage and loss evaluation and the swarm intelligence algorithm.

This application discloses a method for determining the seismic hazard induced by shale gas development based on fuzzy hierarchical analysis. Addressing the technical problem of the difficulty in determining the seismic hazard induced by shale gas development, the technical solution in this specification uses fuzzy hierarchical analysis to predict seismic hazard during the development process, thus providing conditions for improving the safety of development. Furthermore, to ensure the accuracy of the induced seismic hazard prediction, the technical solution in this application, based on extensive scientific practice, designs the selection of the number of influencing factors used in the induced seismic hazard prediction process. This ensures prediction accuracy while avoiding overfitting of the prediction results due to the correlation between influencing factors.

A method for assessing the economic losses of buildings due to earthquakes, considering the interaction between structure and nonstructure, belongs to the fields of earthquake engineering and structural seismic analysis. The method includes the following steps: Step S1, establishing a building performance model; Step S2, determining the seismic hazard level: selecting the ground motion intensity index IM, and determining three intensity levels—minor, moderate, and major—as target hazard levels based on the seismic fortification intensity of the site; Step S3, establishing a three-dimensional structure-nonstructure coupled finite element model; Step S4, performing nonlinear time history analysis and obtaining engineering requirement parameters; Step S5, establishing a building collapse vulnerability function; Step S6, calculating residual displacement and determining whether the damage is repairable or not; Step S7, calculating economic losses based on the theory of total probability; Step S8, interaction contribution coefficients and modeling decisions. This invention improves the accuracy of earthquake economic loss assessment results.