45 results about "Earthquake engineering" patented technology

Structural damage to a building is assessed based on measurement of point rotations using MEMS accelerometer sensors attached to structural columns of a building. The measured point rotations are wirelessly transmitted to a central unit which estimates residual drifts of the structural columns using a model of plastic deformation of the columns that incorporates empirically predetermined structural parameters of the columns such as a height of a column plastic bending point or a column curvature coefficient. The structural damage to the building is then estimated by determining a damage state from performance-based earthquake engineering performance thresholds that relate residual drift to damage. In some embodiments, multiple sensors are attached to each structural column of the building and measure corresponding point rotations at multiple points along the height of the column.

The invention relates to a test device for simulating soil-structure interaction during earthquake occurrence and spread in the research of earthquake engineering. The device consists of a rigid part and a flexible part, wherein the flexible part consists of a universal joint pair device, a U-shaped steel framework and a rubber film; one end of a steel connecting rod with a slipway is fixedly connected with the upper end of a universal joint upper member, while the other end is connected with another universal joint upper member through a roller; the U-shaped steel framework is connected with the steel connecting rod with the slipway through a slideable connecting member; and the rubber film is arranged in a U-shaped space formed by the U-shaped steel framework and the universal pair device and is rigidly and segmentally connected with a model casing. Earthquake occurrence is simulated by combining a plurality of array vibrating table systems and applying different excitations to two adjacent vibrating tables simulating faulting. Corresponding excitations with different speeds are applied to other vibrating tables according to a similar rule so as to further research the interaction between soil and structural power with the consideration of the spread of earthquake in a medium.

The invention relates to a main shock-aftershock sequence-based method for estimating a damage index, and aims at solving the problem that influence of an aftershock to a structure is ignored due to the fact that only single action of a main shock is considered in an existing method for estimating an earthquake damage index. The main shock-aftershock sequence-based method disclosed by the invention comprises the following steps: I: selecting a structural hysteresis model according to an actual earthquake motion type; II: selecting a period, mass and damping of a single-degree-of-freedom structure, and calculating a structural dynamic characteristic; III: performing elastic analysis on selected earthquake motion and the structural characteristic to obtain an elastic strength demand Fe; IV: selecting a strength reduction factor value R, and working out yield strength Fy of an inelastic structure; V: working out a reaction of the structure under action of an earthquake according to a structural dynamic method, and working out the damage index DI according to a damage calculation formula; VI: presenting a damage spectrum prediction model of a main shock-aftershock sequence according to a statistical result of the structural damage index DI. The main shock-aftershock sequence-based method for estimating the damage index disclosed by the invention can be applied to the field of earthquake engineering.

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 discloses a method for determining a post-earthquake repair scheme of an underground subway station, and belongs to the field of earthquake engineering. The method solves the problem that in the prior art, no related dynamic visualization technology for showing the post-earthquake state exists, so that a repairing scheme is not easy to determine according to the post-earthquake state of the subway station. The method comprises the following steps: establishing a subway station BIM model; defining post-earthquake states of components in the BIM model; obtaining the post-earthquake initial state of each component of the subway station, and calculating and collecting the repair cost and repair time required by each component in each damage state; importing the defined post-earthquake initial state, the restoration cost and the restoration time into the BIM model to be displayed; determining a repair scheme according to the displayed post-earthquake initial state, the repair cost and the repair time; dynamically displaying the repair scheme in the BIM model; and repeating the steps for N times to obtain the expected values of the post-earthquake state and the repair time of the subway station, which are used for evaluating the earthquake resistance toughness of the subway station. The method is used for determining the post-earthquake repair scheme of the subway station.

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.

The invention discloses an underground seismic oscillation amplitude parameter prediction method, and relates to the technical field of seismic engineering, the problem that a method capable of predicting the change rule of the amplitude of seismic oscillation along the depth does not exist in the prior art is solved. The prediction of the underground seismic oscillation amplitude parameters aimsto improve an underground structure anti-seismic design method, namely the selection of the amplitude parameters in a reaction displacement method and further simulate the influence of the horizontalseismic action on the underground structure, and the potential damage potential of the seismic oscillation is reflected through the adjusted seismic oscillation parameters. According to the method, the change rule of the seismic oscillation amplitude along the depth is reflected through the prediction result of the underground seismic oscillation. According to the method, the amplitude parameter at any underground depth can be quantitatively obtained according to the amplitude parameter of the ground surface and the effective information of the site, so that the error caused by the predictionmethod can be quantitatively measured.

The invention relates to a site shear wave velocity measuring and calculating method and device, and belongs to the technical field of earthquake engineering, and the method comprises the steps: obtaining lithology description information of a target soil layer, and determining a soil body type corresponding to the target soil layer according to the lithology description information, the target soil layer being a soil layer in a preset depth range of a to-be-measured site; correcting the shear wave velocity empirical data corresponding to the soil body type according to the additional stress of the soil body of the target soil layer at the depth position, and taking the corrected data as the shear wave velocity data of the target soil layer; and based on the shear wave velocity data of the target soil layer, calculating the average shear wave velocity of the covering soil layer within the preset depth range as the shear wave velocity of the to-be-measured site. According to the method, the site shear wave velocity can be measured and calculated more accurately and reliably.

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 relates to a cylindrical cam type damper response amplification device which comprises a rack, a ball screw, a nut, a reciprocating cylindrical cam mechanism and a damper, wherein the ball screw is movably mounted; the nut is in threaded connection with the ball screw; the reciprocating cylindrical cam mechanism comprises a cylindrical cam fixed with the nut and a driven rod matchedwith the cylindrical cam; one end of the damper is connected to the rack, and the other end of the damper is connected to the driven rod; the ball screw penetrates through the cylindrical cam througha central hole of the cylindrical cam; the nut and the rack are relatively fixed in the axial direction of the ball screw. According to the response amplification device, layer displacement and speedresponses caused by a building structure are amplified, so that the damper can give full play to energy-dissipating capacity in a limited design stroke without failure of the displacement; and the response amplification device belongs to the technical field of earthquake engineering.

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 discloses an engineering anti-seismic support used for solving the problem that an existing support is poor in anti-seismic performance. The support comprises an upper part, a middle part and a lower part. The middle part comprises a first sliding plate and a second sliding plate which are stacked from top to bottom, the first sliding plate is rotationally matched with the upper part, each edge of the lower surface of a wing part is provided with an elastic element, the first sliding plate is matched with the lower part through the second sliding plate, and a second arc-shaped toothed protrusion and a third arc-shaped toothed protrusion on the upper surface and the lower surface of the second sliding plate are perpendicular to each other. By means of the support, height is reduced by about 40% under the condition that bearing force and the anti-seismic performance are not changed, product flattening is achieved, and the support has more advantages in the bridge and building installation process.

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 an on-water seismic reflection data acquisition method based on an artificial hammer seismic source and a floating cable, and belongs to the technical field of water-power engineering exploration. Under the condition that the target exploration depth is ensured, the hammer is adopted to knock an aluminum alloy plate to generate seismic waves instead of an explosive seismic source, an encountering time distance curve observation system is adopted, a river-spanning section is arranged on a river surface, and ends of the section on the banks of a river are respectively knocked, so that a floating cable type hydrophone used in offshore object exploration is innovatively used in rivers to receive seismic signals for a first time, field data can be acquired, the problems that the ecological environment can be damaged and polluted by the explosive seismic source, and the method is environmental friendly. The method provided by the invention is already successfully used in water-power engineering in China and other countries, is good in effect and high in practicability and has wide market prospect and high popularization values in water-power on-water exploration as the data acquisition and working mode of conventional on-water seismic reflection exploration is changed and the exploration requirements of ordinary shallow seismic engineering are met.

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.

The invention discloses an earthquake-tsunami continuous effect-based non-elastic displacement ratio spectrum model, belongs to the field of earthquake engineering. The earthquake-tsunami continuous effect-based non-elastic displacement ratio spectrum model is built according to the steps of selecting a large amount of shake, and building a series of non-elastic single-degree of freedom structureswith different periods; determining power characteristic of each period of non-elastic single-degree of freedom structure; calculating maximum elastic displacement of the structure under a given earthquake-tsunami continuous effect, and calculating maximum elastic strength; calculating maximum displacement generated by the structure under the earthquake-tsunami continuous effect; calculating a displacement ductility coefficient of the structure, and judging whether the structure displacement ductility conforms to target ductility or not; and performing regression analysis. By the earthquake-tsunami continuous effect-based non-elastic displacement ratio spectrum model, the problems that currently-proposed non-elastic displacement ratio spectrum model is on the basis of an independent earthquake effect while further influence of a tsunami effect on structure reaction after earthquake is neglected are solved.