10 results about "Equivalent static load" patented technology

The invention relates to the technical field of bridge bearing capacity evaluation, and discloses an existing continuous beam bridge bearing capacity comprehensive evaluation method which comprises the steps that multi-source data are collected to construct a three-dimensional damage voxel field, and an initial finite element model is generated; simulating a heavy load identification control section, and designing an equivalent static load test scheme according to an equivalent internal force principle; executing a field static load test, collecting elastic response data and constructing an actual measurement response vector; calculating errors and iteratively adjusting parameters in a voxel field constraint range to finish model correction; and generating an operation space-time security envelope based on the correction model, and comparing the state in real time to output a control instruction. A three-dimensional damage voxel field is constructed, voxels are used as a normalized data carrier, discrete apparent and internal damage data such as three-dimensional laser scanning point cloud, ultrasonic velocity and rebound strength are mapped into a continuously distributed space field, and the space variability of the rigidity of an existing bridge material can be represented in a refined mode. And the accuracy of describing the physical current situation of the structure by the initial finite element model is improved.

The invention provides a jacket type offshore electrical platform optimization method based on a sequential quadratic programming algorithm. The jacket type offshore electrical platform optimization method comprises the following steps: S1, establishing a parameterized offshore electrical platform structure analysis model; s2, calculating an environmental load borne by the offshore electrical platform by adopting an equivalent static load method; s3, establishing an offshore electrical platform optimization model which comprises a target function and a constraint function; s4, performing optimization design by adopting a sequential quadratic specification algorithm; and S5, performing dynamic analysis on the optimal structure, judging whether the optimal structure meets a constraint condition or not under a dynamic load working condition, if so, ending optimization, and if not, manually adjusting the size of the component which does not meet the constraint until the constraint condition is met. According to the method, the sequential quadratic programming algorithm is adopted, the optimization efficiency is high, the engineering optimization requirement is met, the size optimization of the offshore structure considering the pile-soil interaction under wind, wave and flow loading can be achieved, and the cost is further reduced on the premise that the structural stability and safety are guaranteed.

The application relates to a structure lightweight design method based on a modified equivalent static load method, which comprises the following steps: step 1, establishing a finite element model of an initial structure to be optimized, and calculating linear equivalent static loads; step 2, calculating modulus proportionality coefficients of a plastic deformation stage of the structure to be optimized; step 3, modifying the equivalent static loads of the structure according to the calculated modulus proportionality coefficients; and step 4, carrying out nonlinear topology optimization according to the modified equivalent static loads to obtain an energy-absorbing point lattice cell configuration, and realizing structure lightweight design. The application is based on a material and geometric nonlinear numerical modified equivalent static load method, the equivalent static load method is modified through modulus proportionality coefficients and strain matrix correction coefficients, nonlinear topology optimization of the structure is realized, a three-dimensional model of the point lattice cell configuration is reconstructed according to an optimization result, a geometric parameterized model of the energy-absorbing point lattice cell configuration is obtained, and the model is used for lightweight design of the point lattice structure under a compression load working condition.

The application discloses a rigidity design method of a self-standing reinforced steel chimney, and belongs to the technical field of structural engineering. Firstly, according to the chimney size of the preliminary design and the basic wind pressure value of the design, the standard value of the along-wind load and the equivalent static load of the transverse-wind vortex-induced resonance are respectively calculated, and based on the virtual work principle of structural mechanics, a theoretical solution of the top horizontal displacement of the chimney is obtained. Secondly, considering the influence of the deformation characteristics of the chimney shell and the like, the theoretical solution is multiplied by a maximum horizontal displacement correction coefficient to obtain a real value of the maximum absolute value of the horizontal displacement of the top of the chimney cylinder. Finally, whether the real value of the horizontal displacement exceeds the limit value of the specification is checked to determine whether the chimney wall thickness needs to be increased to improve the rigidity. The application is accurate and reliable, simple to calculate, can save the building materials as much as possible under the premise of ensuring the reliable rigidity of the chimney cylinder structure, and is helpful to obtain a reasonable and reliable rigidity design scheme of the self-standing reinforced steel chimney under the combined action of the along-wind load and the transverse-wind load.

The invention provides a fastener stress determination method, electronic equipment and a readable storage medium, and is suitable for the technical field of fastener stress calculation. The method comprises the following steps: acquiring related parameter information; wherein the related parameter information is a parameter related to the stress of the fastener; based on an equivalent static method and the structure and the installation type of the motor, determining a target stress calculation formula from a preset corresponding relation between the motor and a stress calculation formula; wherein the equivalent static method is used for converting an earthquake load into an equivalent static load; and determining the stress of the fastener based on the related parameter information and a target stress calculation formula. According to the embodiment of the invention, the problems of high calculation cost, long time consumption and relatively high requirement on the precision of the model are avoided, the efficiency of calculating the stress of the fastener is improved, and the accuracy of calculating the stress of the fastener is ensured.

The present application relates to steel frame assembly technical field, and disclose a kind of steel frame-combination lateral force resisting system and assembly method, a kind of steel frame-combination lateral force resisting system assembly method, comprising: step S1, foundation positioning and support installation;Step S2, main frame hoisting;Step S3, transverse beam installation and node splicing fixed;Step S4, repeat installation and expand to full-span structure;Step S5, final fastening and acceptance detection.The present application follows the logic of "first welding flaw detection, then load test, finally glue sealing", to prevent hidden works "sealing with disease";Modified epoxy resin is injected under equivalent static load stress state, fill micro gap, form prestressed occlusion after unloading, realize excellent "reinforcement under load" and fatigue resistance, last glue emptying air before acceptance, maximum limit reduce water vapor residue, achieve real air-tight long-term corrosion protection.

The present application relates to steel frame assembly technical field, and disclose a kind of steel frame-combination lateral force resisting system and assembly method, a kind of steel frame-combination lateral force resisting system assembly method, comprising: step S1, foundation positioning and support installation;Step S2, main frame hoisting;Step S3, transverse beam installation and node splicing fixed;Step S4, repeat installation and expand to full-span structure;Step S5, final fastening and acceptance detection.The present application follows the logic of "first welding flaw detection, then load test, finally glue sealing", to prevent hidden works "sealing with disease";Modified epoxy resin is injected under equivalent static load stress state, fill micro gap, form prestressed occlusion after unloading, realize excellent "reinforcement under load" and fatigue resistance, last glue emptying air before acceptance, maximum limit reduce water vapor residue, achieve real air-tight long-term corrosion protection.

The application relates to the technical field of bridge bearing capacity evaluation, and discloses a kind of comprehensive evaluation method of bearing capacity of existing continuous girder bridge, comprising the following steps: collecting multi-source data to construct three-dimensional damage voxel field, generating initial finite element model;Simulate heavy load identification control section, design equivalent static load test scheme according to equivalent internal force principle;Performing field static load test, collecting elastic response data and constructing measured response vector;Calculate error and iteratively adjust parameters within the constraint range of voxel field, complete model modification;Generate operation space-time safety envelope based on the modified model, and compare state output control instruction in real time.Through the construction of three-dimensional damage voxel field, the voxel is used as the normalized data carrier, and the discrete apparent and internal damage data such as three-dimensional laser scanning point cloud, ultrasonic velocity and rebound strength are mapped into continuous distribution space field, which can finely represent the spatial variability of the material stiffness of the existing bridge. The accuracy of the initial finite element model in describing the physical status of the structure is improved.

The embodiment of the invention provides a power electronic interface load equivalent model construction method considering harmonic characteristics. The method comprises the steps that a fault recorder is adopted to record voltage and current instantaneous values, and steady-state operation, static response and dynamic response data are separated; calculating an equivalent static load model based on the static response; identifying an equivalent dynamic load model based on the dynamic response; analyzing harmonic composition, obtaining the amplitude proportion and initial phase relation of each harmonic, and calculating a harmonic initial phase and fundamental wave initial phase function; and comprehensively establishing a power electronic interface load electromagnetic transient equivalent model. According to the technical scheme provided by the invention, the harmonic characteristics of the power load can be fully considered in the full-electromagnetic transient simulation of the power system, and the method has important significance for improving the accuracy of the full-electromagnetic transient simulation of the power system.

The invention discloses an integrated die-casting floor structure optimization method and related equipment, relates to the field of vehicle body structure design and manufacturing, and mainly aims to solve the problem of low development efficiency of an integrated die-casting floor structure caused by dependence on experience of engineers in the prior art. The method comprises the following steps: determining an optimization target and a performance constraint condition of a floor structure; an equivalent static load model is determined based on the collision peak force and the dynamic correction coefficient, and the equivalent static load model is used for feeding back the collision process of the floor; based on the equivalent static load model, the optimization target and the performance constraint condition are automatically solved to obtain an optimal scheme, and the optimal scheme is used for feeding back die-casting structure characteristics of the floor structure. The method is used for the optimization process of the integrated die-casting floor structure.