34 results about "Displacement based" patented technology

The invention discloses a high-speed rail system sliding layer peak displacement envelope curve and rail direction irregularity prediction method considering seismic oscillation and pier height uncertainty and application. The method comprises the following steps: constructing a multi-mode hybrid neural network model TransTCN embedded with field priori knowledge; feature extraction is carried out on multi-modal input features of a time sequence based on seismic oscillation fusion structure features and a space sequence for outputting peak displacement based on an elastic response spectrum method; the pier height features and the seismic oscillation features are subjected to dimension fusion to serve as time sequence features, and a time dependency relationship is processed; processing a spatial dependency relationship by taking an elastic response spectrum analysis result as a spatial feature; and jointly inputting the extracted features into a constructed multi-mode hybrid neural network model TransTCN, and realizing prediction of the peak displacement envelope curve and rail direction irregularity of the sliding layer of the high-speed rail system under the consideration of seismic oscillation and pier height uncertainty. The prediction precision is improved, the training sample demand is reduced, the regional high-speed rail system damage is rapidly evaluated, and the practical value is good.

The invention provides a viscous damping device based on displacement amplification. Belongs to the technical field of building anti-seismic equipment and comprises a lower mounting plate, an upper mounting plate and a viscous damper, the viscous damper is mounted between the lower mounting plate and the upper mounting plate, two lower gusset plates are fixedly mounted at the top of the lower mounting plate, two upper gusset plates are fixedly mounted at the bottom of the upper mounting plate, and the upper gusset plates are fixedly mounted at the bottom of the upper mounting plate. A first fixing plate is rotationally installed between the two lower gusset plates, the viscous damper is rotationally installed on the first fixing plate, and a connecting arm located above the viscous damper is fixedly installed on the first fixing plate. The viscous damping device based on displacement amplification has the advantages that the viscous damper can obtain the enhanced energy consumption effect under the condition of small displacement, the damping performance of a building under the earthquake action is improved, related personnel can conveniently obtain the operation condition of the viscous damper in the earthquake, and use is reliable.

The invention discloses a static aeroelastic coupling simulation method, device and equipment based on displacement difference, and a medium, and relates to the field of coupling simulation, and the method comprises the steps: obtaining a first aerodynamic load and a second aerodynamic load, determining an aerodynamic load difference and a current surface aerodynamic load of an elastic model, determining a structural finite element grid and a structural surface grid, and obtaining a static aeroelastic coupling simulation result; mapping the current surface aerodynamic load to a structure surface grid to obtain a structure surface aerodynamic load; determining target displacement based on the structure surface aerodynamic force load, the structure finite element grid and the structure surface grid, correcting the target displacement to obtain corrected displacement, and judging whether a difference value between the corrected displacement of two adjacent calculations is smaller than a preset threshold value or not; and if not, determining the current surface aerodynamic load of the elastic model, skipping to the step of constructing the structural finite element model again until the difference value is smaller than the preset threshold value, and judging that the aircraft static aeroelastic coupling simulation calculation result is converged. Therefore, errors of static aeroelastic coupling simulation are reduced.

This invention relates to the field of geological monitoring technology and discloses a method and system for monitoring the displacement of surrounding rock in underground caverns based on self-locking compensation. It aims to solve the problem of poor accuracy in existing methods for monitoring the displacement of surrounding rock in underground caverns. The main components include: implanting self-locking anchors at the bottom of the borehole; implanting corresponding measuring point anchors at multiple measuring points within the borehole; and fixing the self-locking anchors using hydraulically driven flanges; connecting reference transmission rods to the self-locking anchors; connecting corresponding displacement transmission rods to the measuring point anchors; measuring the reference displacement corresponding to the reference transmission rod and the measured displacement of each measuring point corresponding to the displacement transmission rod; determining the displacement transmission coefficient corresponding to each measuring point under experimental conditions; and compensating the measured displacement based on the displacement transmission parameters and the reference displacement to obtain the true displacement of each measuring point. This invention improves the accuracy of monitoring the displacement of surrounding rock in underground caverns and is particularly suitable for underground engineering projects with overall settlement or tilting.

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

This invention provides a method and apparatus for evaluating the service status of tunnel lining based on deformation response. After the tunnel is put into operation, without calculating the increment or total amount of surrounding rock pressure or load after operation, it is possible to determine the lining crack width and safety factor, and evaluate or analyze the secondary lining service status and its variation law at any service time of the tunnel. The method includes: Step 1, determining the displacement increment u2 of the tunnel from the time of commissioning or acceptance to a certain tunnel maintenance time t under the service status; Step 2, establishing a load structure model of the tunnel; Step 3, applying displacement directly to the load structure model based on the displacement increment u2, fixing constraints on all element nodes, and calculating the internal forces of the structure; Step 4, obtaining the safety factor and crack width of the element based on the internal forces of the element; Step 5, evaluating the service status of the tunnel at the tunnel maintenance time t based on the safety factor and crack width.

This invention discloses a deformation analysis method for multi-bolt structural connections based on displacement field equivalence and machine learning, relating to the field of advanced aircraft connection technology, and aimed at solving the technical problems of high computational load and low efficiency in existing technologies. The method includes: establishing a refined model of a single bolt connection process; analyzing the deformation of the connected components during the connection process based on the refined model; obtaining the equivalent load based on the deformation displacement field; constructing a multi-bolt connection deformation analysis model and creating connection elements within the analysis model; simulating the overall component by inputting the equivalent load to obtain a sample dataset; training a machine learning model using the sample dataset and learning the mapping relationship between load boundary conditions and deformation response from the simulation samples; and predicting the deformation of the multi-bolt structural connection based on the trained machine learning model.

The application discloses a kind of retaining wall deformation spatiotemporal alignment analysis method and system under mobile disturbance source action, it is related to engineering construction and intelligent monitoring technical field, including S1: monitoring point to construction area distance is equal;Form the " displacement-absolute time " sequence of each monitoring point;S2: obtain disturbance source construction parameter, dynamically update current average advancing speed v;S3: based on formula t i =T0+d i / v, construction condition determines the disturbed reference time t i Of each monitoring point;S4: relative time is defined as τ=t-t i , realize the spatiotemporal alignment of different monitoring point deformation data;S5: based on displacement-relative time sequence, using 3σ statistical method identifies deformation abnormal point;S6: the displacement data of all monitoring points are mapped to " displacement-construction process " coordinate system, obtain normalized trend model and predict the deformation trend of retaining wall in subsequent construction process.The application realizes the unified comparison of different monitoring point deformation data, improves the accuracy of deformation analysis and prediction precision.

This invention belongs to the field of tunnel surrounding rock stability analysis, specifically disclosing a method for predicting tunnel surrounding rock displacement time series curves based on dynamic Bayesian networks. The method includes: S1. Discretizing influencing factors and surrounding rock displacement to establish a sample library; S2. Improving the construction method of the interpretive structure model to establish an interpretive structure model; S3. Constructing a static Bayesian network model for predicting tunnel surrounding rock displacement based on the interpretive structure model; S4. Improving the structure construction method and parameter learning method of the dynamic Bayesian network model; S5. Constructing a dynamic Bayesian network model inference method to establish a dynamic Bayesian network model; S6. Predicting the tunnel surrounding rock displacement time series curve. This invention optimizes the construction methods of the interpretive structure model, static Bayesian network model, and dynamic Bayesian network model, enabling the determination of the dynamic development of surrounding rock displacement before tunnel construction. This has significant guiding value for tunnel site selection, advanced support, construction method selection, and engineering defect diagnosis.

The invention provides a displacement-based middle fuselage cylinder section support height optimization method. The method comprises the steps of establishing a middle fuselage cylinder section finite element model; establishing a displacement boundary condition of the finite element model of the middle fuselage cylinder section; applying a load to the finite element model of the middle fuselage cylinder section, and solving a displacement field result of the finite element model of the middle fuselage cylinder section at a single support height; increasing the height of the middle fuselage tube section finite element model under the displacement boundary condition, and solving a displacement field result of the middle fuselage tube section finite element model under the supporting height; and establishing a displacement evaluation index, and evaluating the displacement field result under each supporting height to judge whether the supporting height of the middle fuselage meets the rigidity requirement or not. According to the method, the weight of the middle fuselage cylinder section, the length of the middle fuselage cylinder section, the geometrical characteristics of the section of the middle fuselage cylinder section and the height of the supporting position can be considered, and the supporting height of the middle fuselage cylinder section is rapidly calculated and optimized based on displacement.

The invention provides a VMD-SSA-LSSVM-based earth surface deformation displacement prediction method and system, and the method comprises the steps: initializing VMD parameters based on statistical characteristics, carrying out the adaptive VMD decomposition of a standardized earth surface deformation sequence, and obtaining IMF components; eliminating invalid IMF components to obtain effective IMF components; an SSA search space is independently configured, and optimization parameters are obtained; training an LSSVM (least square support vector machine) sub-model of each effective IMF component based on the optimization parameters, and performing rolling prediction on the LSSVM sub-models to obtain a prediction result; and carrying out weighted fusion on the prediction result according to the energy ratio to obtain a surface deformation displacement prediction result. According to the technical scheme, non-stable and multi-scale earth surface deformation signals can be processed, sudden displacement and long-term slow deformation can be captured at the same time, and a more reliable technical means is provided for geological disaster early warning and major engineering safety monitoring.

The present application relates to the technical field of hydraulic control, in particular to a kind of multi-degree-of-freedom drilling boom hydraulic control method and system, comprising the following steps: monitoring the posture change of drilling boom and generating intervention signal, freezing main control path and identifying candidate auxiliary oil cylinder, screening path matching posture demand, sequencing trigger action and recording result, extension control boundary forms hydraulic control scheme.In the present application, by comparing the current posture with historical trajectory in structure rotation, posture deviation and angle rollover change can be quickly identified, abnormal judgment accuracy is improved, path efficient screening is realized by combining driving path locking and auxiliary element grouping, linkage path group is formed based on displacement and posture demand matching analysis and paths that do not meet the conditions are eliminated, cylinder action priority trigger is realized by angle sequencing, and stroke boundary is dynamically corrected by combining completed action, so that control parameters can adapt to structure change in real time, and action stability, path coordination and posture control accuracy are improved.

The application discloses a method for determining an optimal primary support time of underground engineering, proposes a concept of plastic volume rate, determines the optimal primary support time through a sudden change point of a plastic volume rate change curve with a surrounding rock release rate, takes a displacement release rate as a link, combines a surrounding rock longitudinal deformation convergence curve, determines a supporting structure following a working face distance index as a support time criterion, quantitatively and explicitly determines the optimal primary support time of the surrounding rock, and establishes a method for determining the primary support time of the underground engineering layered excavation based on the plastic volume rate, thereby breaking through a problem that a displacement evolution critical state is difficult to find in a method for determining the primary support time based on the displacement release rate and the method cannot be applied to the determination of the primary support time of different layers in the layered excavation of the underground powerhouse, and providing a reference for the layered and stepped excavation design and construction of large underground engineering.

The invention discloses a borehole pressure relief effect analysis and evaluation method, and relates to the technical field of coal mine dynamic disaster monitoring and prevention, and the method comprises the steps: arranging a pull rope type displacement collection device at a hydraulic drilling rig for a coal mine, and arranging a vibration signal collection device at a lane side close to a borehole; on the basis of analysis of the displacement change data and the vibration change data, the pressure relief drilling construction depth is calculated; the average amplitude of the depth per meter is obtained by counting the drilling durations and the vibration amplitudes of different drilling depths; according to the average amplitude of the depth per meter, the distribution condition of the lateral supporting pressure of the roadway is obtained; and evaluating the pressure relief effect of the drill hole according to the distribution condition of the lateral bearing pressure of the roadway. According to the invention, vibration signals under different drilling depths during drilling can be accurately acquired, the technical problems of extensive verification of current drilling construction quality and weak evaluation and analysis of pressure relief effect are solved, and reliable technical support is provided for coal mine dynamic disaster prevention and control.

The invention relates to the technical field of bridge engineering, in particular to a high support deformation monitoring and early warning method based on machine vision. The method comprises the following steps of S1, performing multi-node displacement monitoring according to template matching; and S2, performing safety assessment and early warning according to the overall structure of the node displacement field. According to the machine vision-based high support deformation monitoring and early warning method provided by the invention, a computer vision-based high support deformation monitoring and early warning system is developed through theoretical analysis, numerical simulation and engineering actual measurement, so that the progress from local node displacement monitoring to overall structure state evaluation is realized; the safety of the high support in the construction process can be improved, and digital upgrading of safety management of the building industry is promoted.

This invention discloses a method for seismic-resistant hybrid reinforcement and dynamic control of steel-concrete composite members, relating to the field of civil engineering technology. The method includes configuring an internal steel section, an external high-strength steel bar, and an external fiber-reinforced composite bar to form a hybrid reinforcement system; determining the initial stiffness and mass distribution of the member; calculating the fundamental period of the structure; establishing a dynamic weight relationship between the contribution of each reinforcement component to resisting forces and the inter-story displacement based on the hybrid reinforcement system; obtaining the characteristic period of seismic motion at the target site; determining the dynamic matching characteristics in conjunction with the fundamental period of the structure; and evaluating the required damping level of the member using the dynamic weight relationship; setting adjustable energy dissipation elements in key areas of the member according to the required damping level to form a damping control scheme corresponding to the dynamic matching characteristics; and, based on the damping control scheme, deploying a main energy dissipation zone using low-yield-point steel and an auxiliary energy dissipation zone using shape memory alloy materials in the nodal region and mid-span region, respectively.

The present invention discloses a load-displacement curve calculation method for a steel structure modular building floor system, which belongs to the field of civil engineering and includes the following steps: S1. Calculating the yield bearing capacity based on the yield load theory; S2. Derivation of a hardening coefficient based on various parameters of the steel structure modular building, and then multiplying the yield bearing capacity by the hardening coefficient to obtain the ultimate bearing capacity; S3. Calculating the yield displacement and ultimate displacement based on the derived and fitted parameters; S4. Obtaining two points using the calculated yield bearing capacity and yield displacement, as well as the ultimate bearing capacity and ultimate displacement, and connecting the two obtained points into a bifold line to obtain a simplified displacement load curve graph. The present invention adopts the above-mentioned load-displacement curve calculation method for a steel structure modular building floor system, and the calculation process is simple, providing theoretical support for the calculation method of the yield bearing capacity, ultimate bearing capacity, yield displacement, and ultimate displacement when a column in the steel structure modular building floor system fails.

The present invention provides a method and device for determining the dynamic characteristics of building structure displacement based on video. Vibration video of the building structure to be identified, captured by a camera, can be used to identify and calibrate key points of the building structure. Conversion coefficients for the displacement calibration formula of the building structure to be identified based on the vibration video are obtained. The displacement of the building structure to be identified is determined based on pixel coordinates and the conversion coefficients. The obtained structural displacement is optimized to eliminate jagged errors, align peak points and zero points, and generate a corresponding dynamic characteristic diagram using the optimized displacement data. This application can capture vibration video of the building structure to be identified using low-cost cameras such as emergency monitoring cameras and mobile phone cameras, obtain the displacement of the building structure, and identify its dynamic characteristics. This avoids the need to install fixed sensors in traditional methods and addresses technical issues such as the complexity and fragility of existing monitoring systems and the high repair and maintenance costs.

The invention relates to the field of testing of rock and soil mechanics and granular material mechanics, and provides a method and a system for obtaining structure anisotropy parameters of a discrete material, and the method comprises the following steps: S1, establishing a micro-form constitutive model for describing the particle motion state of the discrete material; s2, obtaining a frequency dispersion relation between spin longitudinal waves and spin transverse waves; s3, establishing a relation model between the cut-off frequency and the anisotropic parameters of the discrete material structure; and S4, performing inversion to obtain the structure anisotropy parameters of the discrete material. According to the method, the characteristics that the spin wave cut-off frequency is non-zero and can be stably measured are fully utilized, the defect that a traditional wave velocity inversion method based on displacement waves is greatly influenced by the frequency dispersion effect and test conditions is effectively overcome, and the method has the advantages of being clear in theoretical basis, high in measurement stability, high in inversion precision, high in application and popularization performance and the like; the method can be widely applied to structural diagnosis of granular materials, design optimization of engineering materials and anisotropic recognition research of complex geological media.

The present invention discloses a method for calculating effective hole depth based on displacement and oil pressure monitoring values. The present invention belongs to the field of geotechnical engineering survey, and includes: obtaining the working parameters of the drilling rig, and drawing a change diagram based on the working parameters; combining the change diagram, and obtaining the effective interval of the drilling rig through a method for determining the effective drilling interval based on the oil pressure threshold; wherein the working parameters include: displacement data and oil pressure monitoring values; the effective interval includes: the effective interval of the soil layer and the effective interval of the rock layer; based on the displacement data and the effective interval of the soil layer, the total monitoring displacement of the soil layer is obtained; based on the displacement data and the effective interval of the rock layer, the total monitoring displacement of the rock layer is obtained; based on the total monitoring displacement of the soil layer and the total monitoring displacement of the rock layer, the total displacement is obtained, and the total displacement is the effective hole depth. The present invention can display the drilling footage length of the drilling rig in real time and calculate the effective drilling depth, reduce the human influence of manual or instrument counting methods, and improve work efficiency.

The invention provides a BIM-based electromechanical construction method and system, and relates to the technical field of construction data processing, and the method comprises the steps: receiving an electromechanical construction scheme comprising a component type, a component layout position and a component reinforcement scheme; by retrieving a related electromechanical sample set, executing layout gap mode analysis to obtain a safety gap; performing preset time zone displacement extreme value statistics to obtain a displacement maximum value; disturbance is executed on the component layout position based on the displacement maximum value, and a compensation component layout position set is obtained; then, on the basis of the safety gap, traversing the component layout position and the compensation component layout position set to carry out BIM modeling, and counting the collision frequency of the BIM models of every two components; and when the collision frequency is zero, an electromechanical construction scheme is executed. According to the method, the safety gap is analyzed and determined based on the BIM model, layout compensation is performed through displacement extreme value prediction, and zero collision of the electromechanical system in the long-term operation process is ensured.

The invention discloses a regulation and control system and method based on an electromagnetic adjustable and controllable friction pendulum composite seismic isolation support, and relates to the technical field of seismic isolation devices in building seismic engineering. According to the system, a horizontal displacement signal of a support is collected in real time through a displacement sensing layer and is transmitted to a microcontroller of an intelligent decision-making layer through a signal processing layer; the microcontroller outputs a corresponding current control signal according to the electromagnetic force regulation and control coefficient based on the relation between the displacement error and the change rate of the displacement error; a programmable current source of the execution regulation and control layer converts a control signal into an accurate current to drive an electromagnet to generate a dynamic electromagnetic force. The electromagnetic force forms adjustable normal pressure through magnetic circuit coupling, and real-time regulation and control of the equivalent stiffness and the damping characteristic of the support are achieved. A closed-loop intelligent control framework with displacement sensing, algorithm decision making, electromagnetic regulation and control and dynamic response is adopted, and the self-adaptive regulation and control capacity of a seismic isolation system on complex seismic excitation is remarkably improved.

The application discloses a kind of digital construction control methods of high-rise building steel skeleton inclined column, to solve the precision control problem caused by structural dynamic deformation and error accumulation in construction process.The method uses extended Kalman filter to estimate the real-time global deviation state of structure online, and combines recursive least squares method to identify and adaptively update the structure state space model online;Further, the theoretical design pose, the environment-induced displacement based on environment data prediction, and the active compensation displacement for active suppression of deviation are synthesized to determine the optimal installation pose of the inclined column to be installed;Finally, digital instructions are generated to guide construction, and the actual installation pose is measured to form a closed-loop feedback for correcting the state estimation of the next cycle.The application can actively suppress error accumulation through closed-loop control combining model adaptation and predictive compensation, improving the construction accuracy and robustness of high-rise building.

The present invention discloses a method for synthesizing near-source seismic motions containing permanent displacements based on an equivalent pulse model. The present invention utilizes the permanent displacement characteristics of the equivalent pulse model, combined with formulas between different magnitudes and fault dislocations, to obtain the permanent displacement time history of the low-frequency part of seismic motions under different magnitude conditions. Finally, based on the near-source seismic motion characteristics, near-source seismic motions that can characterize the permanent displacements under different magnitude conditions are synthesized; the seismic motions obtained by the synthesis method of the present invention can not only meet the seismic motion attenuation characteristics and acceleration peak requirements of the engineering site area, but can also simultaneously reflect the permanent displacement and near-field strong vibrations caused by fault dislocation; the seismic motions obtained by the synthesis method of the present invention can adjust the seismic motion duration, thereby saving time and cost for subsequent related calculations and analysis.

This application proposes a BIM-based electromechanical construction method and system, relating to the field of construction data processing technology. The method includes: receiving an electromechanical construction plan containing component types, component layout locations, and component reinforcement schemes; obtaining a safe clearance by retrieving relevant electromechanical sample sets and performing mode analysis of layout gaps; then obtaining maximum displacement values ​​by performing displacement extreme value statistics in a preset time zone; perturbing the component layout locations based on the maximum displacement values ​​to obtain a set of compensated component layout locations; subsequently, based on the safe clearance, traversing the set of component layout locations and compensated component layout locations to perform BIM modeling, and statistically analyzing the collision frequency between pairs of component BIM models; when the collision frequency is zero, executing the electromechanical construction plan. This application ensures zero collisions in electromechanical systems during long-term operation by determining safe clearances based on BIM model analysis and performing layout compensation through displacement extreme value prediction.

The application provides a marine structure anti-collision performance multi-working condition iterative optimization method and device, including: establishing a finite element analysis model containing soil layer information; applying an operating period dead load to the finite element analysis model and performing static force solving to obtain an initial working condition of a ship collision load; obtaining a plurality of impact working conditions, calculating total ship collision energy and deformation control displacement; performing trial calculation on components of the finite element analysis model and setting the components as fiber beam units; calculating structure energy absorption of the plurality of impact working conditions; calculating energy ratios of the plurality of impact working conditions based on the structure energy absorption and the total ship collision energy, adjusting impact coefficients based on the energy ratios; calculating maximum displacements of the plurality of impact working conditions, calculating displacement ratios of the plurality of impact working conditions based on the maximum displacements and the deformation control displacement, adjusting diameters of rod members and wall thicknesses of the rod members based on the displacement ratios; and outputting final diameters of the rod members and wall thicknesses of the rod members. In the method, marine structure sizes can be automatically iteratively optimized, and the working efficiency of designers is improved.

The invention discloses a steel box girder pushing intelligent control method and system for bridge construction. The method comprises the following steps: collecting multi-source heterogeneous data such as jack oil pressure, steel box girder displacement and environment illumination temperature field on a construction site; constructing a digital twinborn scene comprising a physical entity and an environmental thermodynamic model at a control terminal; performing thermal-mechanical coupling simulation based on the real-time illumination temperature field, and calculating a theoretical thermally induced deformation value of the steel box girder; subtracting the theoretical thermally induced deformation value from the actually measured displacement to obtain a real mechanical deviation, and generating a basic pushing speed instruction according to the real mechanical deviation; analyzing a hysteresis response relationship between oil pressure and displacement based on a digital twinning scene, identifying a static friction state, and generating a micro-motion vibration suppression pulse instruction; and superposing the micro-motion vibration suppression pulse instruction to a basic pushing speed instruction, and driving a hydraulic pump station to execute pushing operation with micro-amplitude high-frequency disturbance. According to the method, thermal deformation misjudgment can be effectively eliminated, stick-slip tremor is inhibited, and the construction precision and safety are improved.

The present application relates to the technical field of performance testing of fully graded concrete, and provides a method, device, equipment and storage medium for obtaining the performance curve of fully graded concrete. The method includes: based on the stress state of the fully graded concrete to be tested, designing the structures of the fully graded concrete specimen and the connecting device, and respectively conducting uniaxial tensile tests and uniaxial compression tests to obtain the corresponding displacement amounts and load peaks; respectively performing linear interpolation based on the displacement amounts and load peaks to obtain a plurality of tensile-compression conversion points and compression-tensile conversion points; adjusting the tensile load of the specimen at each tensile-compression conversion point based on the tensile loading rate, and adjusting the compressive load of the specimen at each compression-tensile conversion point based on the compressive loading rate; collecting the first deformation amount corresponding to the tensile load and the second deformation amount corresponding to the compressive load, and performing fitting to obtain the performance curve of the fully graded concrete, which can truly reflect the change law of the tensile-compression conversion elastic modulus of the dam concrete under the action of seismic cyclic loads and the whole process of concrete damage.