45 results about "Earthquake engineering" patented technology

The invention belongs to the technical field of geotechnical engineering and foundation engineering and relates to a bridge pile foundation anti-earthquake analysis simplified method considering the whole soil liquefaction process in the field of earthquake engineering. The method comprises the steps that a model calculation parameter reasonable determining method and a concrete expression are given out by building a liquefied site pile-soil earthquake interaction macrocell model which well considers the influence on a soil spring of the pile-soil earthquake interaction from sand liquefaction and is used for achieving the process of the pile-soil earthquake interaction; then based on a non-linear Winkler foundation beam model, the built macrocell model is adopted, mass inertia force of soil, participating in vibration, around a pile, inertia force of an upper structure, radiation damping of soil and other effects are considered, a liquefied site pile-soil-bridge beam structure earthquake interaction simplified analysis model is built, soil movement and pore pressure ratio time interval obtained by implementing free liquefaction site power analysis serve as numerical model external input and are used for liquefied site pile-soil earthquake interaction problem analysis, and a new analysis method is provided for actual liquefied site bridge pile foundation anti-earthquake design.

The invention relates to an optimum design method of a seismic survey line by utilizing remote sensing information for arranging and determining an optimum position according to a survey line theory at an early stage of seismic construction. The method comprises the following steps of: firstly, acquiring remote sensing images, and fusing the remote sensing images by utilizing a field actual measurement control point; acquiring more than one selectable survey line according to mobile limiting conditions and seismic acquisition parameters; generating an evaluation point set according to integral track pitches to obtain various evaluation factor index values; normalizing the evaluation factor index values; calculating the goodness of the integral survey lines in a weighting way; sequencing; and selecting a straight survey line with maximal goodness for construction. The invention can meet the requirements for selecting a better survey line position under the condition of detecting an underground target, overcome the defect of limitation on the arrangement and the regulation of seismic survey lines in complex surficial seismic engineering, enhance the implementation of the survey lines, improve the exciting and receiving conditions and increase the signal to noise ratio.

The invention discloses an analysis method and device for aseismic ability of a quayside bridge structure, belonging to the field of earthquake engineering. The analysis method includes determining the aseismic ability level and measure index of the quayside bridge structure based on damage level of the quayside bridge structure, establishing an elastic-plastic finite element analysis model of thequayside bridge structure and selecting uncertainty random variables of the quayside bridge structure, extracting random variable samples, setting up a finite element analysis model and obtaining thecorresponding sample of the finite element analysis model. The aseismic ability curve of the quayside bridge structure is obtained by elastic-plastic static pushover analysis on the sample of the finite element analysis model. The aseismic ability value of different damaging level is extracted from the sample based on the aseismic ability level and measure index of the quayside bridge structure.The aseismic ability value is probabilistically counted, calculated and output the aseismic ability of the quayside bridge structure with structural uncertainty considers. The analysis method and device for aseismic ability of the quayside bridge structure evaluate the aseismic ability of the quayside bridge structure in case of structural uncertainty, which provides a reference for aseismic design and aseismic reinforcement for the quayside bridge structure.

The embodiment of the invention provides a method and a device for getting earthquake motion samples and relates to the field of earthquake engineering. According to the method and the device, the earthquake motion samples having the same non-stationary property as natural earthquake motion can be obtained. The method comprises the following steps: getting instantaneous amplitudes and instantaneous phases of natural earthquake motion records which are pre-stored; uncoiling the instantaneous phases; adopting Fourier transform to get an amplitude spectrum and a phase spectrum of the instantaneous phases after uncoiling; adopting a high-frequency component of the phase spectrum to construct a random frequency process; adopting the random frequency process, the amplitude spectrum and a low-frequency component of the phase spectrum to construct a random phase process; getting an earthquake motion random process according to the instantaneous amplitudes and the random phase process; and getting the earthquake motion samples according to the earthquake motion random process. The method and the device, disclosed by the invention, can be used in the field of earthquake-proof design.

The invention provides a meticulous evaluation method for building earthquake economic loss at a component level, and belongs to the technical field of earthquake engineering. At first, that componentearthquake damage evaluation module is constructed, The seismic damage of each component is evaluated according to the building information model and the vulnerability database by the component seismic damage evaluation module, and then the damage evaluation module is constructed to calculate the seismic economic loss of each component and the building as a whole according to the building information model, the vulnerability database and the repair standard database by the damage evaluation module. Finally, a visualization module is constructed to visualize the damage and loss of buildings. The invention can accurately evaluate the loss to the component, and provides the specific component loss distribution, which provides an important reference for building earthquake repair strategy ordisaster prevention design.

The invention relates to a seismic oscillation amplitude modulation index and amplitude modulation coefficient evaluation method. The objective of the invention is to solve the defect of large introduced errors in quantitative evaluation of seismic oscillation amplitude modulation in the earthquake engineering field in the prior art. An amplitude modulation index and amplitude modulation coefficient evaluation method which is capable of quantitatively evaluating seismic oscillation does not exist in the prior art. The seismic oscillation amplitude modulation index and amplitude modulation coefficient evaluation method of the invention has the following steps that: step one, inelastic SDOF structure dynamic characteristics are determined; step two, eight seismic oscillation parameters are selected as amplitude modulation indexes; step three, unmodulated seismic oscillation records are adopted to calculate a correlation coefficient between structural reaction and the amplitude modulation indexes through utilizing the inelastic SDOF structure dynamic characteristics determined in the step one and the eight seismic oscillation parameters which are obtained in step two; step four, modulated seismic oscillation records are adopted to calculate a correlation coefficient between the structural reaction and the amplitude modulation indexes through utilizing the inelastic SDOF structure dynamic characteristics determined in the step one and the eight seismic oscillation parameters which are obtained in step two; and step five, the ratio of the correlation coefficient obtained in the step four and the correlation coefficient obtained in the step three is calculated, and the more the ratio approaches to 1.0, the smaller errors introduced by seismic oscillation amplitude modulation are. The seismic oscillation amplitude modulation index and amplitude modulation coefficient evaluation method of the invention is applied to the earthquake engineering field.

In order to overcome defects of a stabilized-current power supply used for ground resistivity measurement in industries such as earthquake observation, earthquake engineering and hydrogeology currently, meet the technical requirement that ground resistivity observation is anti-interference and realize needs of AC/DC comparative observation and joint observation, the invention provides an uninterrupted variable-frequency stabilized-current power supply which is designed by using a switching power supply technology and a variable-frequency inverter technology. According to the power supply, sine-wave low-frequency AC stabilized-current power with frequency and current programmable can be outputted for being used by a ground resistivity observation device, or DC stabilized-current power with current programmable can be outputted for being used by the ground resistivity observation device, and 220V/50Hz AC can be outputted for being used by other power consumption devices. The uninterrupted variable-frequency stabilized-current power supply is mainly composed of a switching stabilized-voltage power circuit, a charging circuit, a variable-frequency stabilized-current inverter circuit, a 220V/50Hz AC inverter circuit, an AC/DC reference signal generation and control circuit, a battery pack and a working power circuit.

The invention discloses an energy spectrum predication method based on a principal earthquake and aftershock sequence. In application of the method disclosed by the invention, the problem that the existing energy spectrum model is based on independent effects of principal earthquakes without considering the influences of the aftershocks on the structure is solved. The method comprises following specific steps: step 1, selecting an inelastic SDOF structure and determining the dynamic characteristics of the inelastic SDOF structure; step 2, according to the dynamic characteristics of the inelastic SDOF structure determined in the step 1, solving the motion equation of the inelastic SDOF structure of a base under horizontal shock so as to obtain EI; step 3, according to the EI obtained in the step 2, solving VE; step 4, according to the VE obtained in the step 3, fitting to obtain an energy spectrum model based on the principal earthquakes and aftershocks. According to the method disclosed by the invention, the value of the input energy can be calculated through the energy spectrum model according to the dynamic characteristics of the structure and the dangerousness levels of the principal earthquakes and aftershocks of the place in which the structure is located. The method disclosed by the invention is applicable to the earthquake engineering field.

The invention provides a method for calculating a site response in an earthquake by considering a medium quality factor, and relates to the technical field of earthquake engineering and geotechnical engineering. The method comprises the following steps of selecting a research area with a similar structure, and collecting horizontal seismic records of all bedrock sites; obtaining east-west and south-north Fourier amplitude spectrums of the bedrock sites; calculating east-west and south-north quality factors of every two bedrock sites; obtaining the medium quality factor with a form such as Q(f)=Q0fn; and calculating the horizontal site response of the research site in the earthquake. According to the method for calculating the site response in the earthquake by considering the medium quality factor, provided by the invention, the absorptive attenuation effect of the quality factors on earthquake waves is considered; when a hypocentral distance of a reference site and a hypocentral distance of the research site have relatively large difference, an improved spectral ratio method can evaluate the site response more accurately; a powerful basis is provided for engineering site selection; and the damage to the engineering caused by poor site geological conditions in the earthquake is reduced.

The invention discloses a method for creating a finite element three-dimensional entity based on terrain remote sensing data, and belongs to the technical field of earthquake engineering. The method comprises the following specific steps: extracting latitude and longitude information-containing vector data from an integrated remote sensing data packet; converting the latitude and longitude information-containing vector data from a latitude and longitude coordinate format to a format which can be recognized by finite element software to obtain a finite element recognizable vector data format; reading finite element recognizable vector data, and transversely reading in the data point by point to generate scattered points; transversely scanning the scattered points in rows to generate a spline curve; longitudinally scanning the spline curve to generate a curved surface; generating a spare entity, penetrating the curved surface through the spare entity, combining the curved surface and the spare entity, and extracting a section, four surfaces below the section and connected with the section, and a bottom surface of the spare entity to generate a new entity by using the six closed curved surfaces, wherein the entity takes the section as an upper surface, namely the curved surfaces are embossed onto the three-dimensional entity; and gridding the obtained entity to achieve application of the remote sensing data in the finite element software.

The invention relates to the field of seismic engineering and the field of giant disaster insurance services, and provides a seismic random event set simulation method considering large seismic time correlation, which comprises the following steps: determining seismic activity parameters on a seismic zone and a potential seismic source area; setting a random event set seismic sequence time length;for the potential seismic source area, generating a seismic random event set according to seismic magnitude grades; adopting a Poisson process model to obtain the magnitude, the size and the time ofthe earthquake for the low-magnitude gear; adopting a time correlation process model for a high-magnitude gear to obtain the magnitude, the size and the time of an earthquake; and integrating the seismic directories of the potential seismic source regions to obtain a seismic directory on the whole seismic zone. The invention creatively proposes that the seismic activity on the seismic zone integrally meets the Poisson distribution (time independent model) in statistical significance, and meanwhile, the potential seismic source region locally adopts a large seismic time correlation model, so that the whole and the local are organically combined, the accuracy and the practicability of seismic random event set simulation are greatly improved, and the method has a good application prospect.

The invention belongs to the technical field of earthquake engineering simulation research, and discloses a dam body shock test simulation device with controllable vibration frequency zoning. The simulation device mainly comprises a data acquisition system, a vibration table module, a foundation box, a foundation and a dam body, wherein the vibration table module comprises a high-frequency vibration table and a low-frequency vibration table; the dam body receives transmitted low-frequency and high-frequency synthesized vibration; a water tank communicated with the foundation box in a flexiblesealing manner is fixedly arranged on the low-frequency vibration table; the dam body divides communicated zones into upstream and downstream water body zones; the upstream water body zone is arrangedon one side of the water tank; upstream water in the upstream water body zone receives low-frequency vibration; the low-frequency vibration acts on the dam body; and a damping boundary body is arranged between the foundation box and the foundation. The device adopts high- and low-frequency vibration zoning simulation, so that dam body shock test simulation more meets an actual use condition of alarge-scale high dam; obtained test data tends to be reasonable and accurate; and the test cost is lowered.

The invention discloses a liquefaction site pile foundation composite stress mechanism simulation device and a test method thereof and belongs to the technical field of rock-soil earthquake engineering. An upper end of a vertical loading device is in sliding connection with an upper cross beam of the reaction frame, a lower end of the vertical loading device is connected with an upper end face of the steel outer sleeve, a pile cap is fixed in the steel outer sleeve, a pile body is embedded into the laminated shear model box, and the bottom of the laminated shear model box is fixed to the saturated soil liquefaction excitation device; the horizontal cyclic loading device is in sliding connection with a vertical beam corresponding to the reaction frame, the horizontal cyclic loading device is connected with a pile cap through a steel jacket, and the model box loading device is in sliding connection with a vertical beam corresponding to the reaction frame; when the model box loading device works, the model box loading device is detachably connected with a frame body corresponding to the laminated shear model box, and the vertical loading device, the horizontal cyclic loading device, the model box loading device and the saturated soil liquefaction excitation device are connected with a computer through data lines. The device is used for simulating the composite stress mechanism of the pile foundation of the liquefaction site.

The invention provides an environment-friendly system for acquiring artificial rammer seismic sources, belongs to the field of engineering exploration, and discloses a method for acquiring water seismic refraction data on the basis of artificial rammer seismic sources. The environment-friendly system can replace a system for acquiring explosive seismic sources. Problems of ecological environment destruction and pollution due to explosive seismic sources can be solved by the aid of the method. The method has the advantages that as verified by a series of tests for excitation energy of artificial rammers which are designed voluntarily, exploration requirements of common shallow seismic engineering can be met; meeting time distance curve observation systems are selectively utilized for acquiring the water seismic refraction data of river-crossing sections, aluminum alloy plates are knocked by the artificial rammers on shores to excite seismic waves, hydrophones are transported to receiving point positions by the aid of measuring lines which are arranged on gunwales in advance, and then seismic waves are received point by point at certain intervals, so that the data can be completely acquired; the method of a unit is successfully applied to domestic and overseas hydropower engineering and is high in practicality, and excellent effects are realized; the traditional modes for acquiring and operating water seismic refraction exploitation data are changed, and the method has a broad market prospect and high popularization value in hydropower water exploitation.

The invention discloses a method for identifying Doppler effect in earthquake by using wavelet transform, and belongs to the field of earthquake engineering. According to the principle, seismic records in the initial period of a seismic station are selected for wavelet transformation, and seismic waves are superposed at a high-frequency part in front of fault sliding, so that the high-frequency amplitude of a wavelet spectrum is increased. A plurality of stations located in the direction perpendicular to a certain seismic fault are selected, along with increase of epicentral distances, wavelet spectrum high-frequency amplitudes of the stations are rapidly reduced, and wavelet spectrum low-frequency amplitudes are obviously larger than the wavelet spectrum high-frequency amplitudes when the epicentral distances are increased to a certain extent, which indicates that in the direction, a medium plays a main role in high-frequency absorption attenuation of seismic waves, and no Doppler effect occurs; and a plurality of stations in front of the sliding of the seismic fault are selected, and the invention finds that the high-frequency amplitude of the wavelet spectrum is obviously greater than the low-frequency amplitude of the wavelet spectrum along with the increase of the epicentral distance, which indicates that although the absorption attenuation effect of a medium on seismic waves exists, the Doppler effect enables the high-frequency amplitude of the wavelet spectrum to be increased. The method is clear in theory and has practical value.

The invention relates to the technical field of anti-earthquake design and evaluation, and specifically relates to a ground motion selection method based on anti-earthquake specifications. The groundmotion selection method comprises the steps of firstly performing preliminary selection according to earthquake environment characteristics of the design site, selecting earthquake ground records which conform to the earthquake environment characteristics of the site, and then carrying a following matching step, thereby being capable of effectively controlling earthquake engineering characteristics of the earthquake ground motion; then controlling the spectrum shape of a response spectrum through the variance by means of selecting key points the variance so as to achieve the purpose of overall spectrum shape matching of the response spectrum; and finally selecting a group of required ground motion records through precisely matching characteristic period points of a specification responsespectrum. The ground motion records selected according to the ground motion selection method based on the anti-earthquake specifications can enable the average response spectrum of the selection ground motion to reach consistency with the specification response spectrum in a statistical sense, and can control the spectrum shape of the response spectrum. In addition, the ground motion can keep earthquake engineering characteristics of the natural ground motion, so that the ground motion selection method is applicable to the anti-earthquake design and evaluation.