34 results about "Design load" patented technology

The invention provides a concrete normal section reinforcement design method and system, electronic equipment and a storage medium. The method comprises the following steps: establishing a section stress model containing multi-layer reinforcement strain distribution based on plane section assumption; the stress state of the whole process of the section from axle center compression to axle center tension is simulated by setting strain proportion parameters of the strain of the outermost reinforcing steel bar on the tension side and the limit pressure strain of the concrete; aiming at a plurality of set strain state control points, calculating stress of each steel bar layer position, contribution of the stress to axial force and bending moment and contribution of the stress to a concrete compression area; and based on the section static balance condition, the optimal reinforcement area meeting the design load requirement is determined through iterative calculation, and the configuration constraint of multiple layers of steel bars is considered in the iterative calculation. The method overcomes the defects that a traditional method overestimates the effect of the pressed steel bars and ignores the strain difference of multiple layers of steel bars, and the accuracy and safety of reinforcement design of high-performance concrete structures such as nuclear islands are remarkably improved.

The invention relates to a pile-anchor composite foundation bearing capacity exerting coefficient calculation method, medium, calculation device and system, and the method comprises the steps: obtaining the rock mechanical parameters of each layer of geology of an area where a pile-anchor composite foundation is arranged, initializing the parameters of the pile-anchor composite foundation based on a design load, building an interface bonding-sliding constitutive model according to the rock mechanical parameters, and calculating the bearing capacity exerting coefficient of the pile-anchor composite foundation; a pile-anchor composite foundation load transfer calculation model under the current geological condition is established, the uplift bearing capacity of the pile-anchor composite foundation is calculated through the load transfer calculation model and pile-anchor composite foundation parameters, the uplift bearing capacity of the upper pile foundation and the uplift bearing capacity of the lower anchor rod foundation are extracted, and bearing capacity exerting coefficients are calculated; the invention discloses a method-based implementation medium and system. The calculation device comprises an acquisition module, a model construction module and a calculation module. According to the invention, the field workload is reduced, the engineering cost is reduced, the working state of the pile-anchor composite foundation under various geological conditions is finely simulated, and the operation is convenient.

The invention relates to the technical field of bridge construction, in particular to a bridge pier embedded right-angle bracket support design method and system.The method comprises the steps that geological parameters of a bridge construction area are obtained, and the geological parameters are mapped into load reduction coefficients of bridge pier sites; calculating the design load of the right-angle bracket, synchronously generating a parameterized model of the Bailey buckle, and outputting an initial bracket model of the integrated buckle structure; collaborative optimization of a pier column main reinforcement passing path and a Bailey ring buckle space is carried out on the initial bracket model, and an optimized bracket model with a perforated structure is obtained; performing multi-parameter iterative simulation analysis on the optimized bracket model to obtain a plurality of candidate design schemes; and performing multi-target evaluation on the plurality of candidate design schemes to obtain an optimal design scheme. By means of the method, the problems that in the prior art, geological conditions are difficult to quantify, load calculation lacks dynamic correction, and the space of the bracket and the space of the Bailey ring buckle support are difficult to cooperate are effectively solved, and structural stress optimization and construction arrangement integrated design is achieved.

The application belongs to the field of composite structure layer design of aircraft structure, and particularly relates to a composite laminate layer proportion optimization method, step S1: in the aircraft design process, the design load and the aircraft structure layout are determined, the design allowable value of the composite material applied to the aircraft is determined, including the axial allowable strain epsilon ad , the shear allowable strain gamma ad ; step S2: based on the external load of the aircraft structure and the specific layout, the load characteristic value T of the aircraft to be layered structure is calculated, and the load characteristic value T represents the trend characteristics of the axial load and the shear load of the aircraft to be layered structure; step S3: a plurality of preset proportion composite laminates in a layering library are obtained, and the material characteristic value T m of the composite laminates is calculated; step S4: based on the structure load characteristic value T, the composite laminate with the material characteristic value T m matching the load characteristic value T is selected. The relationship between the structure and the material is quantified, so that the structure material selection is more intuitive and optimal.

The application belongs to the technical field of bridge construction, and is a beam bridge load test method based on time history curve. The method firstly carries out static load test, and then arranges test vehicles at key parts of the test bridge surface by using a step loading mode, and measures deflection points and strain points. Then, the static load test efficiency is calculated through the bridge static load test. According to the step loading mode and the static load test efficiency, a multi-working-condition bridge model is established by using a finite element method to collect time history curves. Finally, dynamic load test is carried out, control sections of each span of the bridge are selected as test sections, and strain fluctuation amplitude, impact coefficient and the like are measured through the dynamic load test. According to the test data, the stress state of the structure under dynamic load is analyzed. The application combines static load test and dynamic load test, can reflect the working performance of the bridge structure under design load, and has high reliability.

The application belongs to the field of aircraft structure dynamic strength design, and particularly relates to a dynamic load static equivalent coefficient determination method and a structure parameter design method, which comprises the following steps: S1: according to a water ditching dynamic load measurement test, a relationship curve between a water pressure load of a bottom of an aircraft fuselage and a time history is obtained, and a peak value Ps of the water pressure load is determined according to the relationship curve; S2: a water ditching test of an elastic model of the bottom of the fuselage is performed to determine a critical failure parameter of the elastic structure; S3: a static mechanical property test is performed with the critical failure parameter of the elastic structure to obtain a maximum static pressure Pd that can be borne by the elastic structure; and S4: a water ditching dynamic load static equivalent coefficient is calculated. The static equivalent coefficient of the water ditching water pressure dynamic load is obtained through a scale model test. The application aims to solve the problem of lacking of design load in aircraft water ditching performance design.

The invention discloses a construction method for an aluminum formwork supporting system of a hollow ribbed floor ribbed beam, and relates to the technical field of building engineering construction. The method comprises the steps that the size of a core mold is determined by combining the floor span, the design load and the concrete strength grade, rib beams are positioned through a two-way coordinate marking method with the axis of a frame column as the benchmark, a core mold arrangement diagram is generated by integrating a structure drawing and a water and electricity installation drawing, and aluminum mold matching and node bulk sample design are conducted based on the core mold arrangement diagram. The distance between vertical rods and force transmission path parameters are set, and it is ensured that the supporting system is matched with the stress of the ribbed beams; accurate alignment of the support and the ribbed beam is achieved according to the process of aluminum mold installation, ribbed beam paying-off, beam and bottom rib installation, ribbed rib installation, embedded pipeline laying, core mold installation, anti-floating fixing, plate surface rib binding, concrete pouring and aluminum mold removal. The problems of support deviation, low wood mold process precision and poor aluminum mold adaptability caused by modulus limitation of a traditional scaffold are solved.

The present application relates to the technical field of high-temperature component creep fatigue test and life assessment, and particularly relates to a high-temperature structure deformation accumulation dynamic creep fatigue load design method under a peak regulation working condition. High-temperature creep performance, cyclic deformation performance, a target test temperature, a typical start-stop number or equivalent cycle number, a main load level range during steady operation, and basic parameters of stress / strain control capability of a testing machine of a target high-temperature structure or a sample thereof are obtained. A stress / strain hybrid control mode is used to generate a dynamic creep fatigue load waveform of the high-temperature structure or the sample thereof. When a dynamic creep fatigue load is executed on a creep fatigue testing machine and a cycle feature meets preset stability and repeatability criteria, the load design is determined to be effective. The present application is easy to implement on existing equipment: the designed load waveform can be realized through software control on a creep fatigue testing machine with stress / strain double closed loop and program loading function, without the need to increase additional hardware, and the engineering operability is strong.

The application relates to the technical field of bridge construction, in particular to a bridge pier pre-buried right-angle corbel support design method and system, which comprises the following steps: acquiring geological parameters of a bridge construction area, and mapping the geological parameters into load reduction coefficients of bridge pier sites; calculating right-angle corbel design loads, and synchronously generating a parameterized model of a Bailey buckle, and outputting an initial corbel model of an integrated buckle structure; performing pier column main reinforcement path and Bailey buckle space collaborative optimization on the initial corbel model to obtain an optimized corbel model with a perforated structure; performing multi-parameter iterative simulation analysis on the optimized corbel model to obtain a plurality of candidate design schemes; and performing multi-objective evaluation on the plurality of candidate design schemes to obtain an optimal design scheme. Through the application, the problems that geological conditions are difficult to quantify, load calculation lacks dynamic correction, and the space of a corbel and a Bailey buckle support is difficult to collaborate in the prior art are effectively solved, and integrated design of structure stress optimization and construction arrangement is realized.

The invention discloses a method and system for determining blade extension bonding shear stress based on a finite element model, and belongs to the technical field of new energy. The method comprises the following steps: acquiring three-dimensional layering structure characteristic data of a blade to be analyzed, and constructing a blade finite element shell model containing a blade tip extension bonding section; a corresponding design load is applied to the finite element shell model, and mechanical response data of the blade structure are obtained through structural mechanical analysis and solution; obtaining an in-plane positive axis elastic constant of a single-layer plate of the to-be-analyzed blade, and calculating an elastic constant of the single-layer plate based on the in-plane elastic parameter; the normal stress of the target laying layer in each shell unit in the blade spanwise direction is obtained through calculation; the thickness of the target laying layers is obtained, the product of the normal stress and the thickness of each target laying layer in the blade spanwise direction is calculated, and the products of all the target laying layers in the same shell unit are accumulated to obtain the unit total force; and calculating the shear stress of the bonding layer based on the unit total force and the spanwise length of the blade tip extension bonding section.

The invention discloses a special lifting appliance for a variable-cross-section three-web variable-cross-section concrete segmental beam. The special lifting appliance adopts a steel strand linking component, an adjusting jack, an adjusting jack fixing component, a gravity center adjusting component, a main lifting beam, a universal shaft, a spacing adjusting component and an auxiliary lifting beam. According to the special lifting appliance, the gravity center adjusting component is adjusted through the jack, plane rotation of the segmental beam in the transverse bridge direction is achieved through the lifting point and the gravity center displacement deviation of the segmental beam, the auxiliary lifting beam is parallel to a segmental beam top plate all the time, it is ensured that a lifting rod piece is perpendicularly stressed, and the auxiliary lifting beam is connected with the distance adjusting component through the universal wheel; and the adjustment of relative postures between the two hoisting beams is realized. The special lifting appliance is used in cooperation with a deck crane, the structure is simple, operation is convenient, the whole lifting appliance is made of high-strength steel, the generated deflection can be neglected under the effect of the designed load, and the lifting safety of the segmental beam is guaranteed.

The invention discloses a stiffness jump type large-deformation anchor rod based on a Braess paradox design, which comprises a main bearing piece, a plurality of connecting pieces, a plurality of connecting pieces, a plurality of connecting pieces, a plurality of connecting pieces, a plurality of connecting pieces, a plurality of connecting pieces, a plurality of connecting pieces and a plurality of connecting pieces, the auxiliary connecting piece serves as a component for achieving rigidity jump, the two ends of the auxiliary connecting piece are connected with the ends, close to each other, of the A section and the B section correspondingly, and the auxiliary connecting piece participates in stress at the beginning and can be disconnected when the designed load is reached; the standby connecting piece adopts a high-strength steel strand and is divided into an independent section C and an independent section D, the two ends of the section C are connected with the end, away from the section B, of the section A and the end, close to the section A, of the section B respectively, the two ends of the section D are connected with the end, close to the section B, of the section A and the end, away from the section A, of the section A, and the section C and the section D are loosened at the beginning; the spare connecting piece is higher than the auxiliary connecting piece in strength; and an anchor. According to the invention, energy can be absorbed in an initial stage in a concession manner, and enough rigidity and bearing capacity are provided under extreme working conditions.

This invention provides a method, equipment, and medium for predictive calculation of hanging basket structures based on multi-source data. It establishes a standardized parameter library by collecting hanging basket design parameters, actual processing data, and real-time on-site monitoring data. A complete structural mechanics model of the hanging basket is built, the overall structural stiffness matrix is ​​calculated, initial design loads are applied, and static equilibrium equations are solved. The structural stiffness matrix is ​​corrected using actual processing data, and the actual load vector is corrected using unloaded static data. Based on the corrected stiffness matrix and load vector, the structural mechanics equations are resolved, and deviations are calculated using construction dynamic data as constraints. If the deviation exceeds a threshold, the structural parameters are iteratively corrected, and the solution is re-solved and compared. This invention achieves high-precision simulation and real-time tracking of the hanging basket's stress state by integrating multi-source data from design, processing, and on-site data and introducing a dynamic correction mechanism, ultimately achieving precise control over structural safety and construction alignment.

The present application relates to a kind of boiler furnace top header hanger load detection method, device and system, the present application is by the stress coefficient of prior calibration to establish the corresponding relationship of load and acoustic time course, utilize piezoelectric ceramic wafer and magnetic attraction type ultrasonic probe respectively measure initial acoustic time course and working acoustic time course under the condition of not changing hanger original structure, realize the non-invasive accurate acquisition of actual working load of hanger pole, avoid the damage and additional stress caused to system by unloading, cutting off hanger pole when traditional sensor installation is needed.The acoustic time course change directly reflects the axial elastic strain of hanger pole, measurement result is not interfered by friction, lateral force and thermal expansion constraint force, can truly characterize the actual load-bearing state of hanger.The load of hanger pole is compared as the load deviation of hanger and design load, quantitative adjustment adjusting component when exceeding the allowable range, accurately distribute header each hanger load, eliminate local stress concentration, improve the operation safety of boiler header.

The invention discloses a loading method for pre-pressing loading of a hanging basket. The loading method comprises the following steps that S1, a counter-force frame and a jack are installed on a zero block web of a construction bearing platform in advance; s2, loading sequence and time, and carrying out graded loading and pre-pressing by using a jack; s3, when the applied load reaches 100% of the designed load, immediately observing, observing once every 30 minutes, observing twice, observing once every 1 hour, and measuring data of each measuring point; when the load is kept for 3 hours, measuring the data of each measuring point again; if the deviation of observation results for three times is within 5 mm, it is considered that deformation of the hanging basket is stable, and unloading can be conducted. By the adoption of the loading method, the problem that in a traditional pre-pressing scheme, pre-pressing point force transmission setting is not reasonable is effectively solved, operation is easy, the real stress state can be simulated, the working efficiency is greatly improved, and the loading method is worthy of application and popularization.

The invention relates to the technical field of constructional engineering, in particular to a wind turbine generator concrete tower tube variable-diameter tower section annular reinforcement design method which comprises the steps that structural parameters of a wind turbine generator concrete tower tube are obtained, and the design load of a variable-diameter tower section is calculated according to the structural parameters; calculating the bottom circumferential tension of the tapered tower section of the variable-diameter tower section and the bottom circumferential tension of the straight tower section of the variable-diameter tower section; calculating the design bending moment of the vertical sections of the conical tower section and the straight tower section; calculating the use amount of conical tower section bottom reinforcing steel bars; calculating the use amount of reinforcing steel bars at the top and the bottom of the straight tower section; and selecting a reinforcement design value of the connecting area of the variable-diameter tower section. Load calculation, toroidal force analysis, model simplification and reinforcement calculation are connected in series to form a complete and efficient closed-loop design chain, the tedious finite element trial and error process is replaced, and the technical problems that when a three-dimensional finite element model is used for designing toroidal reinforcement of the variable-diameter tower section of the tower drum, the workload is large, and the labor cost is high are solved.

The invention provides a television wall design method and device, and relates to the technical field of television supporting structures. The television wall comprises a pull rod, a frame and a supporting rod which are sequentially connected. The method comprises the steps that the frame size of the television wall is determined according to the television diagonal length; determining a design load according to the television weight and a preset safety coefficient; selecting a corresponding profile steel specification from a preset multi-stage bearing system according to the television size range; calculating the positions of a support rod and a pull rod, wherein the support rod and the pull rod are aligned; deformation and stress of the television wall are calculated through stress analysis, it is ensured that the deformation is smaller than preset deformation amount and the stress is smaller than preset stress, and deformation and stress calculation is carried out based on design loads and profile steel specifications through finite element simulation; and constructing a parameterized model. By establishing a multi-stage bearing system and a parameterization design process and adopting finite element simulation, deformation and stress are controlled, structural safety is guaranteed, dependence on experience is avoided, and potential safety hazards are eliminated.

The application discloses a wind turbine blade angle load output and analysis method and system, and belongs to the technical field of wind power. The method comprises the following steps: obtaining load calculation results, identifying coordinate systems, section information and working condition types; extracting load time series data of each section of each blade under extreme working conditions, calculating combined bending moments and azimuth angles; dividing the circumference of the blade into multiple preset angle intervals, and mapping the combined bending moments to the corresponding intervals according to the azimuth angles; establishing a corresponding relationship table of working condition names, section positions, angle intervals, blade numbers and combined bending moments, extracting load representative values of the same working condition group, the same section, the same angle interval and the same blade, and taking the maximum value as load data without a safety factor; performing safety factor correction according to the extreme working condition type to obtain load data with a safety factor; and comparing the load to be checked with design load to output an overall comparison result. The application realizes fine statistical comparison, is independent of Bladed software and saves resources.

The present invention discloses a construction method for a Wharf pier and abutment, comprising : leveling a foundation by distributing prefabricated concrete cushion blocks in a 2 ><2 m grid, applying 50%, 80% and 110% design loads by staged water injection and preloading, performing pressure stabilization and water level reduction, arranging a three-dimensional coordinate control network with a plane position deviation of S3 mm to realize accurate positioning, connecting a reinforcement cage by a pre—embedded short positioning bar, mounting a sealed composite steel formwork With vertical and horizontal stiffening ribs, matching 50 cm thickness of each layer with a combined vibration technology when layered pouring is carried out, and keeping curing of a top formwork after reaching 70% of strength. The method improves bearing uniformity, positioning accuracy and the concrete compactness degree, is applied to pier and abutment construction of hydraulic structures, and can ensure structural integrity and durability.

This invention relates to the field of building engineering technology, specifically to a method for designing the circumferential reinforcement of a variable-diameter tower section in a wind turbine concrete tower. The method includes obtaining the structural parameters of the wind turbine concrete tower; calculating the design load of the variable-diameter tower section based on the structural parameters; calculating the circumferential tensile force at the bottom of the conical tower section and the bottom of the straight tower section of the variable-diameter tower section; calculating the design bending moment of the vertical sections of the conical and straight tower sections; calculating the amount of reinforcing steel at the bottom of the conical tower section; calculating the amount of reinforcing steel at the top and bottom of the straight tower section; and selecting the reinforcement design value for the connection area of ​​the variable-diameter tower section. This invention links load calculation, circumferential force analysis, model simplification, and reinforcement calculation into a complete and efficient closed-loop design chain, replacing the cumbersome finite element trial-and-error process, and solving the technical problems of high workload and high labor costs when designing the circumferential reinforcement of variable-diameter tower sections using a three-dimensional finite element model.

The invention provides a steel structure deformation monitoring method based on a three-dimensional point cloud model, and belongs to the technical field of data processing, and the method comprises the steps: collecting three-dimensional point cloud data of each bearing partition of a steel structure, and associating partition numbers to generate a point cloud data set with partition identifiers; feature extraction is carried out on the point cloud data set, dense point clouds of bolt connection nodes and beam-column connection points are reserved, and a partition feature point set is generated; calculating a first deformation coefficient based on the design load-bearing parameter of each load-bearing partition, calculating a second deformation coefficient in combination with the real-time load data, and establishing a double-coefficient correlation model; and matching the partition feature point set with the double-coefficient correlation model, determining the deformation level of each bearing partition through deviation analysis, and outputting a monitoring report containing a coefficient matching result. And the precision of steel structure deformation monitoring is improved.

The application discloses a kind of based on the horizontal bearing characteristic evaluation method of correction p-y curve spiral steel pile, comprising: obtaining in-situ static sounding test data and pile body design parameter, and establish the initial p-y curve of eliminating the experience dependence of soil body;Determine the influence area of spiral plate horizontal load, and introduce amplification factor in the influence area to the initial p-y curve in the pile around soil resistance is corrected;Based on the elastic foundation beam theory, establish finite difference equation group and iteratively solve the horizontal displacement of pile body;Further determine the angle of pile body, bending moment, shear force and the distribution of pile around soil resistance, draw the horizontal load-displacement curve of spiral steel pile, compared with design load to obtain horizontal bearing characteristic evaluation conclusion.The application uses in-situ static sounding test data to replace traditional experience parameter, and is combined based on the geometric parameter of pile body, realizes the objective, standardization evaluation of spiral steel pile horizontal bearing characteristic.

The invention provides a compilation method for a low-cycle fatigue load spectrum of a volute composite structure of a pumped storage power station, and the method comprises the steps: building a finite element mesh model of a steel volute-concrete composite structure according to engineering design data, and enabling the model to reflect the interaction between a steel volute and concrete; simulating a water filling and pressure maintaining construction process by adopting a hinge unit, and obtaining the stress of the steel volute at each node under a static loading condition; determining a steel volute prototype load history based on the operation mode and the water level real-time monitoring data; editing a load process by adopting a rain flow counting method; compiling a low-cycle fatigue stress spectrum according to the stress and load history of the steel volute; establishing a stress mixing model, and obtaining a temperature influence proportion; and correcting the low-cycle fatigue stress spectrum according to the mixed model. The method fills the blank of load input in the anti-fatigue design of the steel volute, improves the accuracy of stress calculation, and provides a reliable basis for predicting the fatigue life of the volute.

This invention belongs to the field of flexible body aircraft technology, specifically relating to a static strength equivalent loading test method for lightweight wings. The test method includes aerodynamic load calculation; load zoning and equivalent calculation; test bench installation and clamping; equivalent loading of counterweights; static strength and bending / torsional stiffness measurement; and test result recording. By designing the mass and distribution of the loading counterweights in corresponding areas, the method ensures that the weight, center of mass position, and resultant moment of the loaded counterweights are consistent with the concentrated force, load center of gravity, and resultant moment of the aerodynamic loads, thus solving the problem that traditional test methods cannot accurately simulate the distribution of real aerodynamic loads. The above test method utilizes a flexible wing static strength test bench to solve the problem of static strength and stiffness testing of strut-and-rope reinforced flexible wing structures. By changing the height of the support beam, it achieves the static strength and stiffness testing function of flexible wings under variable stiffness. Through a flexible loading counterweight module, it achieves high-precision equivalence between the loaded counterweights and the design load.

The utility model provides a steel-concrete combined hollow pier structure of a high-speed railway, which solves the problems that when the ratio of the width B of a transverse bridge direction wall plate to the thickness t of the transverse bridge direction wall plate of the existing ultrahigh hollow pier structure does not meet the local stability requirement, the width B of the transverse bridge direction wall plate needs to be reduced or the thickness t of the transverse bridge direction wall plate needs to be increased by adjusting a transverse inner slope; the concrete quantity and the foundation design load are increased, and the construction control difficulty is increased. The structure comprises a bottom reinforced concrete solid section, a middle reinforced concrete hollow section and a pier top reinforced concrete solid section which are sequentially arranged from bottom to top, a hollow cavity is formed in the middle reinforced concrete hollow section, a vertical steel partition plate is arranged in the hollow cavity, and the width of the vertical steel partition plate extends in the bridge direction. The two side edges of the vertical steel partition plate are fixedly connected with the transverse bridge wall plates respectively. The width-to-thickness ratio of the wall plates in the transverse bridge direction is reduced through the vertical steel partition plates, the using amount of concrete and the foundation load are reduced, the economical efficiency of the pier is remarkably improved, and the construction difficulty is lowered.

The invention discloses an offshore wind power pile optimization method and device based on weak underlying layer bearing capacity checking calculation, and belongs to the field of offshore wind power pile optimization. The method comprises the steps that firstly, the stress spread angle corresponding to a bearing stratum where the pile end of the offshore wind power pile is located, the pile end diameter, the bearing capacity characteristic value corresponding to a soft underlying layer and the vertical distance from the pile end to the soft underlying layer are obtained; determining a stress diffusion range corresponding to the top surface of the soft underlying layer according to the parameters; according to the stress diffusion range and the bearing capacity characteristic value, a bearing capacity contribution value calculation formula is adopted to obtain a pile end additional load corresponding to the soft underlying layer; finally, according to the first preset pile end design load and the pile end additional load, the final pile length corresponding to the offshore wind power pile is output, and the offshore wind power pile is optimized accordingly. And the construction cost of the offshore wind power pile is reduced.

The invention discloses an oil cylinder fixing structure, a joint size determination method and an aerial work platform, and belongs to the technical field of aerial work engineering machinery and computer aided modeling. The oil cylinder fixing structure comprises an oil cylinder, a check block, a fixing bolt and an arm support connecting plate, a limiting groove is formed in the middle of a mounting connector at the end of the oil cylinder, longitudinal limiting is achieved through matching of a stepped structure and the arm support connecting plate, axial limiting is achieved through the check block inserted into the limiting groove, and the rotating rigidity of the connector is remarkably improved. Meanwhile, according to the method, a finite element model of the oil cylinder connector is established, a linear equivalent algorithm is adopted for rapid iterative design, then a nonlinear equivalent algorithm is adopted for accurate verification, an efficient and reliable design closed loop is formed, and connector size parameters capable of achieving the design load are determined. According to the method, the buckling instability resistance of the oil cylinder is effectively improved, the safety and reliability of the long arm frame of the aerial work platform are guaranteed, and a standardized tool is provided for performance prediction and reliability evaluation.

The method comprises the steps that the included angle between the truss tower and an original fan tower drum is drawn up, the construction position of each newly-added truss tower foundation is obtained, and loads of a truss tower conversion platform and the original fan tower drum are obtained; based on the load of the truss tower conversion platform and the original fan tower cylinder, the diagonal bracing counter-force of the truss tower on the first newly-added truss tower foundation and the diagonal bracing counter-force and diagonal bracing counter-force acting diameter of the truss tower on the third newly-added truss tower foundation are obtained, and the design load of the pile foundation is obtained with the diagonal bracing counter-force acting diameter as the benchmark; a pile foundation is constructed outside an original wind turbine foundation bottom plate, and a newly-added truss tower foundation is constructed on the pile foundation; and a truss tower conversion platform and a fresh air fan tower drum are constructed on the original fan foundation stand, and the truss tower conversion platform and a truss tower are constructed, so that construction is completed. The method has the advantages that an original fan foundation is utilized to the maximum extent, manufacturing cost is saved, and environment friendliness is achieved; and the stability of later use is ensured.

The invention discloses a nonlinear calculation method for integral fire endurance analysis of a plane steel frame structure, which comprises the following steps of: aiming at the plane steel frame structure with known geometric parameters, material attributes, design load and fire bearing component information, firstly performing static analysis under the design load, and then performing thermal-mechanical coupling analysis under a fire hazard working condition; in analysis, a constructed second-order beam-column unit formula containing a plastic hinge model is adopted, influence factors such as geometric nonlinearity, material nonlinearity, initial geometric defects and residual stress of a structure are comprehensively considered, and the temperature of a fired component is gradually increased in thermal-mechanical coupling analysis until nonlinear calculation is divergent; and finally obtaining the integral fire endurance and the internal force deformation response of the structure. The thermal-mechanical coupling nonlinear analysis of the steel frame structure is carried out by adopting the second-order beam column unit and the fine plastic hinge model, and an accurate calculation result can be obtained by simulating one steel member only by one to two units, so that the analysis efficiency is greatly improved.

The present application relates to the technical field of bridge engineering, specifically to a UHPC-steel box composite beam bridge prestress system design method, comprising: obtaining bridge design geometry and material parameters, constructing a refined finite element model containing steel box beam and UHPC layer units and defining the interface connection relationship; applying design load for simulation analysis, extracting the longitudinal normal stress distribution of the UHPC layer on the top of the steel box beam upper flange, and identifying the tensile area exceeding the UHPC tensile strength; arranging the prestress beam initial path along the longitudinal direction in the tensile area to ensure that the pre-compressive stress covers the tensile area; establishing a coupling analysis model of the steel box beam, UHPC layer and prestress beam unit, defining the prestress beam as a tensile rod unit only and connecting it with the UHPC layer through the coupling node, and finally determining the prestress system design. This method can accurately match the structural stress demand and improve the reliability of the prestress system.