26 results about "Structural stress" patented technology

The invention relates to the technical field of weld joint vibration fatigue life evaluation, in particular to a weld joint vibration fatigue life evaluation method based on a simplified modal structure stress method. The method specifically comprises the following steps: establishing a simplified finite element model of a welding structure without welding seam details, and calculating a structural mode of the simplified finite element model; a modal coordinate time history is obtained according to the structural modal, and the modal structural stress at the weld toe is calculated through a linear difference value; superposing the modal coordinate time history and the weld toe modal structure stress to obtain a weld toe structure stress time history; obtaining the change range and cycle index of the structural stress according to the rain flow counting statistics of the structural stress time history at the weld toe; equivalent structure stress is calculated; and calculating by adopting a main S-N curve method to obtain a damage and fatigue evaluation result of the welding seam. The modal structure stress at the weld toe is calculated through the linear difference, weld joint details do not need to be established, the workload of finite element model establishment can be greatly simplified, the modeling complexity is reduced, and the modeling efficiency is improved.

The invention provides a bracket-free arch rib concrete pouring construction method which comprises the following steps: S1, carrying out analogue simulation on a key process before construction, and determining a pre-camber parameter, S2, erecting a tie beam bracket, pouring concrete, installing an arch rib pre-embedded anchor plate, and tensioning a tie beam top and bottom prestressed steel beam, S3, installing a temporary bracket of an arch rib, and erecting an operation platform, S4, symmetrically hoisting arch rib sections, closing of the arch ribs is completed, a second batch of prestressed steel beams are tensioned, and structural stress is stabilized; s5, temporary supports of the arch ribs are dismantled, stress system conversion is achieved, and S6, concrete in the arch ribs is poured in a staged mode, the compactness is ensured, and the problems that a traditional support assembling method has the high requirement for the strength of the arch rib supports and the requirement for the foundation bearing capacity are solved.

The utility model discloses a profile steel enclosing purlin reinforcing component for a PC construction method pile, which comprises a cross beam (2) connected with a profile steel enclosing purlin (1) and a main support rod (3) fixed on the ground, and the main support rod (3) is fixedly connected with the lower end of the profile steel enclosing purlin (1); the rod body of the main supporting rod (3) is provided with an inclined supporting rod connecting seat (4), the end part of the inclined supporting rod connecting seat (4) is connected with inclined supporting rods (5), a transverse straight plate (6) is arranged between the inclined supporting rods (5) on the two sides, and the plate body of the transverse straight plate (6) is provided with a rod body connecting seat (7). The enclosing purlin can be effectively supported and reinforced, structural stress points are dispersed, and the structural strength of the enclosing purlin is improved.

This invention relates to a performance testing method for a high-load-bearing, long-stroke air spring assembly, comprising the following steps: S1, determining the model and operating parameters; S2, installation and alignment; S3, air pressure setting; S4, pre-cycle; S5, stretching the air spring; S6, compressing the air spring; S7, unloading and returning; S8, recording deformation data. Before formally recording data, the performance testing method of this invention performs multiple complete compression and rebound pre-cycles on the air spring. This not only eliminates the initial structural stress relaxation of the air spring bladder and cord layer, improving the repeatability and consistency of stiffness testing, but also identifies hidden damage or assembly defects in the air bladder in advance, avoiding sudden failure during formal testing. Furthermore, it allows the rubber material of the air spring to reach a stable hysteresis working state, simulating the actual pre-service break-in process, making the subsequently measured stiffness parameters closer to the true values ​​of long-term stable operation, and thus making the test data more accurate.

The utility model discloses a bridge expansion device for building a bridge, which comprises a bridge main body, an expansion joint is arranged in the bridge main body, an expansion device main body is arranged at the top of the expansion joint, a reinforcing steel bar ring is arranged at the bottom of the expansion device main body, and reinforcing ribs are arranged in the reinforcing steel bar ring. Mounting plates are arranged on the left side and the right side of the telescopic device body, outer plates are arranged on the inner sides of the mounting plates, steel rings are arranged in the middles of the interiors of the outer plates, inner grooves are formed in the interiors of the outer plates, biting rings are arranged in the inner grooves, and connecting plates are arranged on the inner sides of the biting rings. The embedded connection of the steel rings and the biting rings enhances the strength of the joints, larger stress and deformation can be borne, the bridge body is allowed to freely stretch out and draw back under the conditions of temperature changes, load changes and the like due to the existence of the expansion joints, and therefore the structural stress is reduced, the bridge body is protected, and the situation that the telescopic structure between devices is affected due to dense biting teeth is prevented.

The invention relates to an asymmetric damping box optimal arrangement and design method based on limited construction conditions, which comprises the following steps of: 1, designing an asymmetric damping box occupation, 2, arranging a transition section of the asymmetric damping box, 3, arranging an annular bulkhead of the asymmetric damping box, 4, arranging a radial bulkhead of the asymmetric damping box, and 5, designing an asymmetric damping box. The method comprises the following steps: step 1, arranging asymmetric damping box stiffeners, step 2, arranging asymmetric damping box stiffeners, step 6, arranging asymmetric damping box sawteeth, step 7, arranging asymmetric damping box bulkhead holes, step 8, arranging asymmetric damping box toggle plates, and step 9, optimizing the structure of the asymmetric damping box. According to the damping box designed through the method, the heaving motion performance of the cylindrical floating facility can be improved, the problem that the damping box limits the construction scene of the cylindrical floating facility is solved, and meanwhile the problem that the local structure stress concentration of the connecting position of the damping box and the cylindrical floating facility body is obvious is solved; and the requirements of deep and far sea energy development can be better met.

The application discloses a kind of finite element model construction analysis methods of decompressive craniectomy, specifically related to the field of decompressive craniectomy, comprising: extracting preoperative functional magnetic resonance image and fiber imaging data, establishing functional area atlas containing activation area and fiber direction information;Then according to the consistency of cortical thickness and direction, the anisotropic elastic tensor parameter set of each functional area is constructed, and it is input into the finite element model to establish the joint stress field coupling functional mode response and structural stress.Under the condition of setting multiple bone window configurations, the displacement gradient response of the functional area is simulated and spatially aggregated, and the stability drift sensitive surface is extracted;Finally, based on the response characteristics of the sensitive area, the structural displacement of each decompression scheme is quantitatively evaluated, and the bone window configuration combination that causes the minimum loss of functional stability is output, to provide structural stability support for decompression path planning.

The utility model provides an in-beam steering gear for a pre-tensioned broken line prestress wide-web T-shaped beam, which comprises a plurality of positioning foundation supports, a prestress rib limiting system and rigidity reinforcing connecting rods, the two ends of the prestress rib limiting system are fixedly connected with the positioning foundation supports, the rigidity reinforcing connecting rods are arranged below the prestress rib limiting system in the same direction, and the rigidity reinforcing connecting rods are fixedly connected with the positioning foundation supports. The two ends of the rigidity reinforcing connecting rod are fixedly connected with the positioning foundation support. The steering gear has the advantages that the reinforcing connecting rod is arranged, and the gasket assembly is arranged on the main connecting rod, so that the overall structural stress performance of the steering gear is remarkably enhanced, and the steering gear can bear a large amount of load force generated when a steel strand steers in the construction process; therefore, the stability of the whole construction process and the integrity of the structure are ensured. In addition, construction steps can be simplified, construction time is shortened, construction difficulty is lowered, and constructors can complete operation more efficiently.

The invention belongs to the technical field of retaining walls, and particularly relates to a reinforced gravity type retaining wall anti-seismic structure which comprises a first hinge plate, a shaft connecting end is arranged on the surface of one side of the first hinge plate, the first hinge plate is movably connected with a second hinge plate through the shaft connecting end at the tail, and the same shaft connecting end is arranged on the surface of one side of the second hinge plate. The first hinge plate and the second hinge plate are connected end to end, the surface of the first hinge plate and the surface of the second hinge plate are fixedly provided with bottom partition panels through bolts, and through grooves are formed in the surfaces of the bottom partition panels; through a multi-stage energy buffering mechanism of the arc-shaped elastic plate, the damping spring, the inner cylinder assembly and the rubber bottom ring, layered absorption and dissipation of earthquake energy are achieved, impact of vibration on the structure is weakened, and compared with a traditional structure, the load transmission efficiency under the earthquake action can be effectively reduced, structural stress concentration is reduced, and the service life of the structure is prolonged. The anti-sliding and anti-overturning capacities of the retaining wall in a medium-high-intensity earthquake are improved, and the structural core safety is guaranteed.

The present invention provides a water-stopping and force-transmitting structure for stepped joints. The structure comprises a left water-stopping and force-transmitting component and a right water-stopping and force-transmitting component, wherein the left and right water-stopping and force-transmitting components are connected in a concave-convex manner. The present invention can simultaneously achieve water-stopping and force-transmitting functions, and can improve the structural stress-bearing performance of the joint.

The present application relates to a kind of nuclear power plant small branch pipe welding joint fatigue life curve establishment method, device, storage medium and electronic equipment, comprising: determining to be analyzed sample;Determine the first natural frequency of to be analyzed sample;To be analyzed sample is carried out structural excitation and alternating stress control and structural stress calculation, determine the fatigue life of to be analyzed sample;Equivalent structural stress of to be analyzed sample is obtained;Equivalent structural stress and fatigue life are analyzed based on, obtain the equivalent structural stress and fatigue life relationship of to be analyzed test;According to equivalent structural stress and fatigue life relationship carries out curve fitting, obtains the structural stress fatigue life curve of to be analyzed sample.The present application carries out analysis calculation to welding joint, with good adaptability, improve the scientific nature, accuracy of small branch pipe weld vibration stress reliability evaluation result, provide basis for reasonable arrangement maintenance plan of power plant, avoid unnecessary excessive maintenance to improve economy.

The present application relates to the technical field of weld vibration fatigue life evaluation, and particularly relates to a weld vibration fatigue life evaluation method based on a simplified modal structure stress method. Specifically as follows: a simplified finite element model of a welded structure not containing weld details is established, and the structural modal of the simplified finite element model is calculated; the modal coordinate time history is obtained according to the structural modal, and the modal structural stress at the weld toe is calculated through linear difference; the modal coordinate time history and the modal structural stress at the weld toe are superimposed to obtain the structural stress time history at the weld toe; the structural stress change range and the cycle number are obtained through rain flow counting statistics according to the structural stress time history at the weld toe; the equivalent structural stress is calculated; and the damage and fatigue evaluation results of the weld are obtained by using the main S-N curve method. The modal structural stress at the weld toe is calculated through linear difference, the work load of establishing the finite element model can be greatly simplified without establishing the weld details, the modeling complexity is reduced, and the modeling efficiency is improved.

The invention discloses a quick stress assessment method for a bogie frame angle structure based on response surface model adaptation, and relates to the technical field of engineering hoisting machinery. The technical problem that the stress of the angular structure of the bogie frame cannot be quickly calculated is solved. The method comprises the steps that a trolley frame finite element model is established, and stress influence key parameters are analyzed and determined based on trolley frame angle form structure sensitivity; performing response surface (RSM) method test design based on the key parameters, extracting key parameter sample data, and constructing a sample matrix; a key parameter and stress mapping relation is obtained based on the response surface model, and a single factor-stress and multi-factor-stress agent model is established; and a single-factor-stress agent model and a sample matrix are used for correcting a multi-factor-stress agent model, so that the accuracy of the model is improved, and rapid and accurate evaluation of the structural stress is realized.

The application discloses a circular mechanical connecting piece for a concrete member, which comprises a foundation pit guard plate, a side pulling piece, a circular connecting piece, a straight pulling piece, a middle connecting piece, a middle pulling piece and a reinforcing bar connecting piece, the foundation pit guard plate is composed of four sides to form a fence shape, a plurality of sinking pulling holes are formed through the outer side of the foundation pit guard plate, and matching inclined surfaces are formed on opposite sides of the foundation pit guard plate, the side pulling piece comprises a basket bolt piece; the hollow ring structure of the annular pipe piece makes the stress relatively stable, the inner reinforcing rib on the inner side is used for increasing the structural stress intensity, the side auxiliary hole and the cross pipe piece are used for making the annular pipe piece structure stress reduction, the key point position is provided with an opening to make the stress relatively stable, the structure action force is indirectly increased, a plurality of stable positions and connecting point positions are provided for the connection of the structural piece, the relative stability of the structure is ensured, and the concrete connection stress point position is increased, so that the relative stability of the structure is ensured.

The application discloses a large-span net shell step-by-step lifting method based on flexible reinforcement, which comprises the following steps: assembling a first net shell in a middle section of a large-span net shell and second net shells at two ends of the first net shell on the ground, arranging a ground support device and a temporary lifting support, lifting the first net shell first, simultaneously lifting the first net shell and the second net shells to splice a third net shell, and adopting a flexible reinforcement mode to ensure that structural stress and deformation in the lifting process are controlled within a safe range. That is, the application adopts a synchronous integral lifting method of ground assembly, multi-point synchronous lifting, flexible reinforcement and high-altitude rod supplementing, precisely controls the deflection, ensures that the structural stress and deformation in the lifting process are controlled within a safe range, and lays a foundation for precise butt joint of the net shell when being lifted into position.

The invention provides a three-type fracture grid insensitive strain energy density calculation method which comprises the following steps: S1, obtaining the size of a pipe joint subjected to three-type fracture, and obtaining basic parameters of a stress field analytical solution based on the size of the pipe joint subjected to three-type fracture; s2, performing finite element calculation to obtain a traction-force-based structural stress which is insensitive to a use grid; s3, calculating a first undetermined coefficient c and a second undetermined coefficient d based on the structural stress; s4, calculating a stress component of the notch based on the first undetermined coefficient c and the second undetermined coefficient d to obtain an analytical solution of a stress field; and S5, sequentially solving a notch strain field and a strain energy density field based on the analytical solution of the stress field, and finally obtaining the strain energy density. The invention provides a solving method of a stress field of a sharp V-shaped notch for describing structural stress based on traction force under type III fracture.

The utility model relates to the technical field of crane stress detection, and discloses a crane fly jib structure stress detection device, which comprises a fly jib main body, the top of the fly jib main body is fixedly connected with a fixed patch, the top of the fixed patch is fixedly connected with a strain gauge, the top of the fly jib main body is fixedly connected with a waterproof shell, and the top of the waterproof shell is fixedly connected with an elastic piece. And one side of the strain gauge is fixedly connected with a waterproof line, the other end of the waterproof line is fixedly connected with a strain testing machine, the other side of the top of the auxiliary arm body is fixedly connected with a base, and a groove is formed in the top of the base. According to the utility model, the clamping block is moved out of the groove by pulling the pull rod, so that the strain testing machine is placed along the inner wall of the groove, and then the pull rod is loosened to push the linkage slide block to move under the action of the spring, thereby driving the clamping block to move, namely enabling the clamping block to move into the groove, and fixing the strain testing machine. Therefore, a worker can conveniently carry out a structural stress test.

The present invention discloses a method, system and medium for determining the parameters of the joints of a lateral connection maintenance system of a grid; it relates to the technical field of building structure design; by constructing a finite element model and conducting multidisciplinary simulation analysis, it is possible to comprehensively consider factors such as structural stress, material properties, and construction errors, accurately determine the width and size of vertical joints, and avoid problems caused by joints that are too wide or too narrow; by combining multidisciplinary simulation analysis such as structural mechanics, acoustics, and airflow vibration, it is ensured that the design of the vertical joints not only meets the structural stress amplitude requirements, but also optimizes the sound insulation performance and reduces the impact of vibration; by adjusting the basic parameters of the vertical joints, the force distribution of the steel keel and the concrete side panels is optimized, and the overall stiffness, stability and durability of the structure are improved; thus achieving multi-objective optimization, providing a scientific design basis, and reducing reliance on empirical formulas.

The utility model relates to the technical field of slope retaining, and discloses an assembly type recoverable retaining wall device which comprises a positioning assembly, a retaining assembly, a greening assembly and a closing assembly, and the positioning assembly is made of reinforced concrete; the positioning assembly is placed on a concrete cushion layer; the positioning assembly comprises a wall toe and a clamping groove, and the clamping groove is rectangular; according to the retaining wall, the positioning assemblies, the wall toes, the clamping grooves, the soil retaining assemblies and the clamping pipes are arranged, the anti-sliding capacity of the foundation is remarkably enhanced through the design of the wall toes of the positioning assemblies, the clamping grooves and the clamping pipes of the soil retaining assemblies are fixedly connected in an embedded mode to form an overall stress system, the anti-overturning performance of the retaining wall is greatly improved, and through the stacked inserting design of the multiple layers of soil retaining assemblies, loads are transmitted through self weight; the structure stress distribution is optimized, the number of layers (such as 3-8 layers) of the soil retaining assemblies can be dynamically adjusted according to the height of the slope, the landform requirements of different engineering scenes are flexibly met, and the modularization adaptability is effectively improved.

The invention discloses a design method of a vibration platform for a large hydraulic vibration system and the vibration platform, and the method comprises the steps: determining the size, bearing capacity and exciting force of the platform according to the use demands, building a three-dimensional finite element model, and carrying out the modal, stress and buckling analysis; and through multi-round optimization, it is ensured that the first-order inherent frequency is larger than the multiple maximum use frequency, the structural stress is lower than the allowable stress of materials, and the buckling stability meets the safety requirement. The finally designed platform is of a space rigid structure formed by welding the top plate, the parallel rib plates, the inclined rib plates, the surrounding plates and the sealing plates and has high rigidity, low mass and excellent multi-direction bearing capacity, 121 threaded holes are formed in the top plate so that a sample can be conveniently installed, weight reduction holes are formed in the second rib plates, the dynamic response efficiency and adaptability are effectively improved, and the stability of the platform is improved. The device is suitable for high-load and high-frequency hydraulic vibration test scenes.

The invention discloses a curved rib mounting device and method which are applied to assembly construction of curved ribs on a top plate of a steel box girder, and the steel box girder is fixed on an external workbench. A first guide rail and a walking mechanism are arranged on the external workbench; the walking mechanism adjusts the fixing position of the portal frame structure on the first guide rail. A second guide rail perpendicular to the first guide rail is fixedly arranged on the portal frame structure; the drive unit drives the clamp hanging frame assembly to move along the second guide rail. A door-shaped mounting frame with a height adjusting function is arranged on the clamp hanger assembly; a first pressing roller is arranged in the top pressing roller unit, and the top pressing roller unit enables the first pressing roller to be attached to the upper surface of the curve rib all the time; a second pressing roller is arranged in the side pressing roller unit, and the side pressing roller unit enables the second pressing roller to be attached to the outer side face of the curve rib all the time. Continuous smooth fitting of the curve U-shaped rib and the curve I-shaped rib is achieved, the fitting precision and the production efficiency of the curve rib and the steel box girder web are improved, and the structural stress requirement is met.

The invention relates to the technical field of material fatigue performance evaluation, in particular to a method for predicting a structural stress level-fatigue life relation curve family based on cyclic load influence and application. The method comprises the following steps: acquiring structural stress level-fatigue life relation curve data of a target material under a small amount of different average stress levels, and calibrating stress level correction model parameters; and correcting the stress level values of the two reference life points under the condition of the symmetric cyclic load to the stress level values under the condition of the target asymmetric cyclic load based on the calibrated model, and connecting the stress level values with the stress level values, so that a high-precision structural stress level-fatigue life relation curve under a plurality of target average stress levels can be generated. According to the method, the prediction precision of the structural stress level-fatigue life relation curve under the asymmetric cyclic load can be remarkably improved, the method has the advantages of being high in prediction precision, wide in application range and high in engineering applicability, and a more reliable and efficient solution is provided for anti-fatigue design and safety evaluation of an engineering structure.

The utility model relates to the field of bridge engineering, and discloses a prefabricated and assembled UHPC (Ultra High Performance Concrete) box-shaped arch bridge, which comprises two arch seats correspondingly arranged, a plurality of supporting units connected between the two arch seats, and mutually connected to form an arch rib; the stabilizing mechanism is arranged on the skewback, and the stabilizing mechanism is connected with the arch rib; according to the splicing type arch crown section, the arch middle section and the arch foot section, the whole structure is simple and reliable, structural stress is reasonable, meanwhile, installation can be conveniently carried out, the splicing type arch crown section and the splicing type arch foot section are suitable for large-span arch bridges which cannot be constructed through a full framing, and the splicing type arch crown section and the splicing type arch foot section are suitable for large-span arch bridges which cannot be constructed through the full framing. And therefore, the whole construction can be safely and stably carried out, the later maintenance is reduced, and the whole cycle life is prolonged.

The invention discloses a multistage connecting structure for an endpoint of a bulkhead main framework and a pressure-resistant shell of a submersible vehicle. The multistage connecting structure comprises a flitch, a T-shaped longitudinal bone, the bulkhead main framework and an arc toggle plate, the flitch is mounted on the surface of the pressure-resistant shell; the T-shaped longitudinal bone comprises a T-shaped longitudinal bone web plate and a T-shaped longitudinal bone panel, the T-shaped longitudinal bone web plate is connected with the flitch, and the end parts of the T-shaped longitudinal bone web plate and the T-shaped longitudinal bone panel are connected with the plane bulkhead; the bulkhead main framework comprises a bulkhead main framework web plate and a bulkhead main framework panel, and the end parts of the bulkhead main framework web plate and the bulkhead main framework panel are connected with the T-shaped longitudinal framework panel; and the arc toggle plate is connected with the T-shaped longitudinal panel and the bulkhead main framework panel. Through multi-stage connection of the T-shaped longitudinal bone, the flitch, the arc toggle plate, the arc toggle plate panel and the like, the structural stress is reduced stage by stage, the problem of local stress concentration of the pressure-resistant shell is finally solved, the stress of each structure is relatively uniform, the problem of local stress concentration is obviously improved, and deformation among the structures is more coordinated.

The invention relates to the technical field of structural stress analysis, in particular to a grid insensitive fillet weld fracture structural stress analysis method and system, and the method comprises the steps: building a structural model comprising weld connection by using finite element software; a working load is applied to the structure model, the structure model after the working load is applied is solved, and overall stress distribution and nodal force information of the structure are obtained; defining a cutting path perpendicular to the substrate at the welding root of the model, and extracting a stress result of the cutting path by utilizing a post-processing function of finite element software; according to the stress result and the weld leg size, the traction stress component under the cutting plane angle is calculated through a formula; traversing cutting plane angles in a formula, and determining a critical failure plane and a maximum stress value corresponding to the critical failure plane; and performing fatigue life evaluation and weld joint structure optimization based on the maximum stress value. According to the method, the calculation efficiency and the engineering applicability are improved, and a reliable basis is provided for standardized and intelligent design of welding seam fatigue evaluation.

The utility model relates to a tank container with a split skirt, which solves the technical problems that the existing straight skirt is large in dead weight, high in assembly difficulty, complex in structure, unfavorable for load transmission, poor in structural stress condition and easy to generate stress concentration and fatigue. The device comprises a frame, a tank body and a split skirt for connecting the frame and the tank body, the end frames of the framework are formed by alternately enclosing cross beams and corner columns and are connected through corner fittings; inclined struts are arranged in the end frames; the split type skirt is of an annular structure with a notch, the small-diameter end of the split type skirt is connected with the peripheral face of one end of the tank body, and the large-diameter end of the split type skirt is connected with the inclined strut or the corner column. By means of the structure, transmission of longitudinal force is more direct, and the stress condition is obviously improved. In addition, the complexity of the connecting structure is reduced, the overall self weight is reduced, the safety of the whole machine is improved, meanwhile, light weight is achieved, and the economical efficiency is further improved.