40 results about "Eccentric loading" patented technology

The utility model relates to an electric sliding table with a double-guide structure. Comprising a guide rail, a synchronous belt arranged around the guide rail, a sliding table assembly arranged on the synchronous belt, synchronous wheel structures installed at the two ends of the guide rail and a driving device used for driving the synchronous belt to operate. The sliding table assembly slides on the two sides of the guide rail. The synchronous belt is wound on the two groups of synchronous wheel structures; the driving device is in transmission connection with one group of synchronous wheel structures; according to the technical scheme, the problems that in the prior art, limitation of a sliding table is particularly prominent, a single-side guide structure is prone to clamping stagnation when bearing eccentric loads, the equipment shutdown frequency is increased due to the loosening risk of a synchronous belt, a tensioning mechanism lacks the dynamic compensation capacity, belt length changes caused by temperature rise or vibration cannot be automatically adjusted, frequent manual intervention is needed, and the working efficiency is high are solved. And meanwhile, due to the lack of modular design, the time consumption for replacing or maintaining the synchronous belt is obvious, and the continuity of a production line is influenced.

The present application belongs to the technical field of hoisting equipment, and provides a steel box girder construction hoisting device, which comprises a lifting ring one and a lifting rope, the lifting rope is provided with multiple ropes, and the top of each rope is connected with the lifting ring one; the other end of the lifting rope is provided with an angle self-adaptive assembly, the bottom of the angle self-adaptive assembly is provided with a horizontal limiting assembly, and the gravity lifting clamping mechanism is arranged at the bottom of the steel box girder below the horizontal limiting assembly; the angle self-adaptive assembly comprises a bearing plate, four side edges in the top of the bearing plate are symmetrically provided with arc-shaped track frames, a sector gear plate and an arc-shaped swing plate are respectively arranged in the inner side groove corresponding to the arc-shaped track frames, the arc-shaped guide sliding plates one and two are arranged in a cross mode between the sector gear plate and the arc-shaped swing plate, and the groove of the arc-shaped guide sliding plate two is provided with a sliding block two in sliding fit. The present application has the following beneficial effects: the hoisting point angle is realized in real-time self-adaptive adjustment, the problems of shaking, tilting and eccentric loading in the hoisting process of the steel box girder are completely avoided, and the hoisting posture is stable.

The invention belongs to the technical field of mining, and relates to a test device and a test method for simulating interaction between a roof and an ore pillar, and the test device comprises pressurization equipment, a support, an elastic steel plate and a load transmission assembly. The support comprises a bottom plate and two supporting columns arranged on the bottom plate, and the distance between the two supporting columns is adjustable. A sample is placed above the bottom plate and located between the two supporting columns. The elastic steel plate is arranged on the two supporting columns and used for simulating a top plate, and the bottom face of the elastic steel plate makes contact with the top face of the sample. The load transmission assembly is used for converting concentrated loads output by the pressurization equipment into distributed loads and acting the distributed loads on the elastic steel plate. According to the scheme, the interaction between the top plate and the ore pillar can be simulated, the stress, deformation and damage conditions of the ore pillar under the non-equal-span stope structure under the eccentric load can be simulated, meanwhile, a top plate-ore pillar model does not need to be poured or built, and the method has the advantages of being short in test period, low in cost and the like.

This invention relates to a method for testing the fracture toughness of anisotropic eccentrically loaded single-sided notched tensile specimens, comprising: S1, establishing a two-dimensional plane stress model of anisotropic material ESET specimens; S2, mesh generation; S3, calculating displacement, strain, and stress field to obtain the stress intensity factor K and compliance C under different initial crack lengths and anisotropic material parameters; S4, establishing crack length calculation formulas and stress intensity factor calculation formulas based on compliance under different eccentric loading rates, initial crack lengths, and anisotropic material parameters. This invention allows for rapid and accurate measurement of crack length simply by measuring the deformation of the material under external force; it reliably extends the application range of standardized eccentrically loaded single-sided notched tensile specimens from traditional isotropic metals to modern advanced materials such as composite materials, additive manufacturing alloys, and rolled plates, while ensuring the calculation accuracy under anisotropic conditions.

The application discloses an anchor bolt shearing strength test device, and relates to the field of new anchor bolt material detection. The upper end of a preset base frame is provided with a driving motor assembly, the surface of the preset base frame is provided with a hydraulic driving assembly, and the output ends of the driving motor assembly and the hydraulic driving assembly are both provided with movable nesting pieces. The anchor bolt shearing strength test device is provided with a guiding and locking mechanism. The guiding and locking mechanism keeps the eccentricity-preventing and centering positioning state of the detected workpiece. The upper and lower ends of the locking butt joint pieces work together to keep the anchor bolt centered during the locking process, ensure that the shearing force is always perpendicular to the anchor bolt axis, and make the guiding and locking mechanism and the guiding spherical wrapping piece on the end side contact each other. The guiding spherical wrapping piece provides flexible wrapping while its uniform expansion characteristic further assists the anchor bolt in keeping the centered position, effectively eliminates the additional bending moment caused by eccentric loading, makes the measured shearing strength value closer to the real strength of the material, forms multi-dimensional positioning constraints, and improves the test accuracy and repeatability.

This invention provides an intelligent method, apparatus, equipment, and medium for adaptive adjustment of the bulk density of loaded materials. The method includes: acquiring real-time status data corresponding to the loading task during the execution of the loading task; updating the bulk density value of the material loaded in the truck bed, and determining the theoretical material height and initial telescopic stroke based on the task description information; generating the material overflow probability and material distribution based on visual data of the material in the truck bed; adjusting the initial telescopic stroke to obtain the target telescopic stroke using a sliding mode controller based on hierarchical reinforcement learning; and controlling the telescopic movement of the telescopic cylinder according to the target telescopic stroke to drive the telescopic chute, thereby achieving adaptive adjustment of the height of the material loaded in the truck bed. This invention can automatically adjust the height of the material loaded in the truck bed to achieve uniform, flat, and non-eccentric loading requirements.

This invention relates to a scaled-down rotating cable anchoring loading device and testing method, belonging to the field of civil engineering structural testing and measurement. It addresses problems such as eccentric loading, impure force distribution, unstable load, and poor spatial adaptation in traditional scaled-down models. The device comprises a box, a pulley guiding mechanism, a steel beam, and a top loading device. The box is secured to the scaled-down anchors using clamps or backfill. The pulley guiding mechanism consists of guide rails, a sliding table, vertical pulleys, and two sets of horizontal traction pulleys, allowing for three-dimensional adjustment to ensure the horizontal guidance of the cable. The top loading device employs a jack structure, using a lifting piston rod to vertically raise and lower the loading arm synchronously, applying horizontal tension and possessing a self-locking pressure-holding function, enabling long-term stable load holding. The testing method involves device installation, anchor and cable placement, pulley leveling, pre-loading, self-locking pressure holding, and data acquisition to complete the test. This invention achieves pure horizontal, high-precision, stable, and controllable loading. It features a compact structure, simple operation, and accurate acquisition of mechanical parameters, making it suitable for cable anchored scaled-down model testing.

The invention relates to an axial eccentric test loading control device and method, in particular to test loading equipment capable of achieving eccentric loading and monitoring loading loads in real time, and belongs to the field of aircraft design and manufacturing. Comprising a load transmission shaft, a compression loading sleeve, a tensile loading sleeve, a compression force measuring sleeve, a tensile force measuring sleeve, a stress rod, an eccentric adjusting spring and a connecting bolt, eccentric loading adjustment can be achieved in the testing process, and the adjusting capacity of testing equipment is improved. Load real-time monitoring can be achieved, and the loading capacity of testing equipment is improved. The device is simple in structure and convenient to carry out and use, and has high economic benefits. The method is high in universality, can be applied to multiple test industries, and is wide in application range.

The application discloses a slide beam structure of a single-arm hydraulic machine, and relates to the technical field of hydraulic equipment.The slide beam structure comprises a columnar beam body and a matching part arranged opposite along the radial direction of the beam body, both the matching parts are distributed along the axial direction of the beam body and extend outward along the radial direction in a wing shape; the matching part has a U-shaped guide surface, a vertical guide surface is arranged on the beam body, the vertical guide surface is adjacent to one side surface of the U-shaped guide surface and is perpendicular to the one side surface, and an adjusting mechanism for adjusting the guide gap in the radial direction of the beam body is arranged on the vertical guide surface; in the application, the slide beam is in a cylindrical or prismatic shape, the guide size of the slide beam is lengthened, the guide precision is improved, the extrusion stress of the guide rail surface under the eccentric load condition is reduced, the service life of the slide beam of the hydraulic machine is prolonged, the slide beam structure is more suitable for the single-arm hydraulic machine with large tonnage and small table surface, the effect is remarkable, and the application lays a foundation for designing and manufacturing the single-arm hydraulic machine with higher structural strength and stronger eccentric load resistance.

The invention provides a hard rock elastic mechanical parameter obtaining method and device under the eccentric loading condition, and belongs to the technical field of optical measurement and numerical simulation. The method comprises the steps that first displacement is obtained through a uniaxial loading experiment; introducing an eccentric loading coefficient, and calculating in finite element software to obtain a second displacement; establishing a multi-target error function according to the first displacement and the second displacement; outputting the final elastic modulus, Poisson's ratio and eccentric loading coefficient under the condition that the multi-target error function reaches the convergence condition; under the condition that the multi-objective error function does not reach a convergence condition, iteratively optimizing mechanical parameters by adopting a simulated annealing particle swarm optimization algorithm improved by a dynamic cooling strategy based on particle swarm diversity, and incorporating an eccentric loading coefficient into a to-be-inverted parameter; according to the method, the inversion analysis of the rock elastic mechanical parameters and the eccentric loading coefficient is realized, and the inversion precision is improved by adopting the improved simulated annealing algorithm.

This invention relates to a toothless planetary roller screw pair, comprising a planetary nut, a planetary screw, and a plurality of planetary rollers disposed between the planetary nut and the planetary screw. Each planetary roller has a threaded portion in its center that mates with the planetary screw and the planetary nut. Each planetary roller has several annular grooves distributed axially at both ends. Each planetary nut has several annular grooves at both ends that mate with the annular grooves of the planetary rollers. The annular grooves and annular grooves can slide relative to each other. This invention uses annular grooves and annular grooves at both ends to form a sliding raceway contact pair, replacing the traditional gear-internal gear ring mating structure. The contact between the annular grooves and annular grooves ensures complete contact across the entire raceway, resulting in strong load-bearing capacity and significantly improving the rollers' resistance to eccentric loading and skewing. Furthermore, the mating clearance between the annular grooves and annular grooves can be machined and controlled according to actual working conditions, resulting in higher constraint and limiting accuracy, stronger stability and impact resistance, and significantly reduced machining and assembly difficulty.

This invention relates to the field of tensile testing machine technology, specifically to an auxiliary tensile device for a tensile testing machine and its working steps, including a bending stress adjustment device, a hollow rotating device, a flat pushing mechanism, a preload sensor, and a controller; the bending stress adjustment device is used to automatically adjust the bending stress generated by the eccentric load on the lapped specimen; the hollow rotating platform is used to adjust the up-and-down movement of the clamping body; the flat pushing mechanism is used to realize the left-and-right movement of the jaws; the preload sensor (6) is used to detect the clamping force during the clamping process, and the controller controls the start and stop of the motor of the hollow rotating device (2) based on whether the detected clamping force reaches a preset value. The technical solution of this invention has the following advantages: high degree of automation, precise control of clamping force, ability to eliminate the bending stress generated by the lapped specimen, reduction of environmental noise, and improvement of working comfort.

The utility model belongs to the technical field of concrete tensile deformation test, and particularly relates to a concrete tensile deformation test device, which comprises a frame, the frame is concentric-square-shaped, one side of the inner wall of the frame is fixedly provided with a motor, and two sides of the inner wall of the frame are rotatably connected with two symmetrically distributed two-way screws; the two shells are installed on the two sides of the inner wall of the frame in a sliding mode, and a measuring center is fixedly installed on one side of each shell; the moving assembly is arranged in the frame and is used for driving the two shells to move; the synchronous assembly is arranged outside the two shells and used for driving the two threaded sleeves to rotate at the same time, the two ends of concrete are clamped and fixed at the same time, the clamping strength is consistent, and the situation that due to the fact that the clamping strength of the two ends of the concrete is inconsistent, eccentric loads are generated in the concrete stretching process, and the clamping strength of the two ends of the concrete is not consistent is avoided. And therefore, convenience is brought to the use of the working personnel.

This invention relates to the field of bridge structural health monitoring and reinforcement optimization technology, providing a method and system for analyzing the structural condition of old concrete T-beam bridges based on multi-data fusion. The method includes: predicting the comprehensive impact value of eccentric loading on the side beams of the target old concrete T-beam bridge within a preset operating cycle; when the comprehensive impact value of the eccentric loading exceeds a judgment interval, generating a correction factor based on the degree of exceedance relative to the judgment interval; and correcting the initial repair and reinforcement parameters according to the correction factor to obtain optimized repair and reinforcement parameters. This invention identifies anomalous intervals of coordinated response that are difficult to detect using traditional methods, and on this basis, introduces a correction factor based on the degree of exceedance to continuously and quantitatively adjust the initial repair and reinforcement parameters, improving the matching between the repair plan and actual operating conditions. This invention can improve the targeting and structural safety of side beam repair, reduce the risk of misjudgment, and has good engineering application value.

The utility model provides a kind of concrete column eccentric loading device suitable for multiple eccentricity, including the loading plate being connected with loading machine and the pressure plate being set above concrete column, loading head is equipped below the loading plate, V-shaped groove corresponding with the loading head is equipped above the pressure plate, multiple V-shaped grooves are equipped at intervals, when multiple eccentricity test is needed, loading head is moved to the corresponding interval above corresponding V-shaped groove, then test starts, so that the test problem of multiple eccentricity of concrete column eccentric loading test is solved, by connecting screw rod and guiding device on loading head, the position of loading head can be adjusted by screw rod, and loading head can be moved to the next V-shaped groove.

The utility model relates to steel support axial force adjusting device technical field especially relates to a kind of foundation pit steel support axial force adjusting device.Its technical scheme includes the pedestal applied to steel support and live joint, and the both sides of the pedestal are slidably installed with support rod, and the support rod is fixedly installed with jack, and it further includes the centering component installed on the pedestal, the centering component drives the middle part of pedestal to move to the position coinciding with steel support axis, and the pedestal is installed with the driving assembly of driving jack synchronous reverse movement.This utility model can prevent eccentric loading by the centering component, and avoid steel support tube wall under the combined action of superhigh local compressive stress and bending moment, partial bulging, wrinkling or even crushing at the position of maximum stress, prevent local instability to weaken the overall load-carrying capacity of steel support.

The utility model discloses a universal testing machine clamp suitable for an open type high-temperature furnace, which comprises a connecting rod, a square right-angle U-shaped frame and a clamp, and the connecting rod is connected with a universal testing machine; the square right-angle U-shaped frame is connected with the connecting rod, a groove is formed in one end of the square right-angle U-shaped frame, and a through hole is formed in the other end of the square right-angle U-shaped frame; the clamp is installed between the two square right-angle U-shaped frames which are oppositely arranged through the through holes and the grooves. According to the utility model, the square right-angle U-shaped frame is adopted, so that the pull rod realizes compression loading under the action of tensile load, the instability hidden danger of a slender rod under the compression working condition is avoided, and the space of the compression clamp is reduced to the maximum extent; the device is small in size and can be easily applied to a small-volume open type high-temperature furnace; the square right-angle U-shaped frame adopts concentric shaft sliding hole matching, so that coaxial loading can be realized, and the problem of eccentric loading caused by non-coaxial compression loading is effectively avoided.

The invention discloses an anti-eccentric loading tool device for an axial loading test of a stiffened plate. The device belongs to the technical field of ship and ocean engineering structure tests and is composed of a stiffened plate test piece, a steel head assembly, an end loading clamp, a side clamp and a supporting base. The steel head is welded to the end of the stiffened plate according to the neutralizing shaft, the loading clamp is adopted for clamping, it is ensured that loading force acts along the neutralizing shaft of the stiffened plate, and end face bending moment is avoided; meanwhile, adjustable clamps are arranged on the two sides of the stiffened plate, flexible adjustment and clamping are conducted according to the position of the test piece, accurate simulation of the four-side simple support boundary conditions is achieved, and the loading precision and the test reliability are improved; according to the invention, high-precision loading path control and real boundary condition reproduction are realized through a fixed loading end, centering steel head welding, an adjustable side clamp and a rigid base; the device can prevent loading eccentricity, eliminate end face bending moment and improve loading precision and repeatability; and meanwhile, the device is suitable for buckling and ultimate bearing capacity tests of different types of stiffened plates.

The invention provides a press machine and the like capable of detecting die abnormality in a plurality of steps. The press machine includes: a detection unit that detects a load value when a material to be processed is press-processed; a storage unit that associates and stores the load value for one cycle amount of pressing detected by the detection unit with identification information of a die attached to the press when the load value is detected; a calculation unit that obtains an eccentric load for each predetermined press angle on the basis of the stored load value for one cycle volume, and generates distribution data of the eccentric load for each die; and a determination unit that determines an abnormality on the basis of an eccentric load for each predetermined press angle obtained on the basis of the load value for one cycle amount detected by the detection unit and on the basis of the distribution data of the eccentric load. The distribution data of the eccentric load corresponds to a mold mounted on the press machine when the load value is detected; and a notification unit that notifies an abnormality on the basis of a determination result by the determination unit.

The invention discloses a clamp device and a test method suitable for a bending fatigue test under displacement control of a T-shaped joint. Belongs to the field of welding structure fatigue performance testing. Comprising an upper clamp, a lower clamp and a plurality of bolts, a cylindrical structure arranged at the bottom of the upper clamp is in contact with an upper plate positioned in the middle of the T-shaped joint test piece, and the center of the cylindrical structure is offset from the central axis of the T-shaped joint test piece, so that the upper clamp forms eccentric loading in the process of moving downwards along with the hydraulic wedge block, and the lower clamp is rigidly connected with the T-shaped joint test piece through a plurality of bolts. Through reasonable structural arrangement, the upper clamp can accurately transmit displacement; meanwhile, the real stress mode of the test piece under the bending load is ensured through the high-rigidity constraint of the lower clamp. The objective of the invention is to improve the loading stability and the displacement control precision and ensure the true and reliable stress distribution, so that the accuracy and repeatability of the bending fatigue test of the T-shaped welding structure are obviously improved.

The invention relates to the technical field of industrial robot speed reducers, in particular to an RV speed reducer applied to an industrial robot, which comprises a shell, an input shaft and a rotating frame are rotatably arranged in the shell, three rotating shafts are uniformly and rotatably connected to the rotating frame in the circumferential direction, and the three rotating shafts are in transmission connection with the input shaft through planet gears. First channels and second channels are formed in the three rotating shafts in the axial direction and are close to the axes of the two eccentric wheels correspondingly, so that the mass of the rotating shafts in the axis areas of the eccentric wheels is reduced, eccentric loads generated when the eccentric wheels rotate are reduced as much as possible, and the unbalance loading force of cycloidal gears on the eccentric wheels is reduced; therefore, the situation that due to unbalance loading of a traditional RV speed reducer, a gap between a rotating groove and an eccentric wheel is increased, and parts are damaged is avoided, the service life of a rotating shaft, the eccentric wheel and a cycloidal gear is prolonged, meanwhile, the vibration amplitude during operation is reduced, and the stability of joint transmission of the industrial robot is guaranteed.

A press machine includes: a detection unit that detects a load value during press working on a workpiece material; a storage unit that stores load values for one cycle of the press machine detected by the detection unit in association with identification information of a die attached to the press machine during detection of the load values; a calculation unit that calculates eccentric loads for predetermined press angles based on the stored load values for one cycle of the press machine and generates eccentric load distribution data for each die; a determination unit that determines an abnormality based on the eccentric loads for the predetermined press angles obtained based on the load values for one cycle of the press machine detected by the detection unit and the eccentric load distribution data corresponding to a die attached to the press machine during the detection of the load values; and a notification unit that notifies of the abnormality based on a determination result of the determination unit.

The invention relates to the technical field of ice mechanical tests, in particular to a simulated ice bending strength testing device and a testing method thereof. Comprising a rack, a fastening assembly and a loading assembly, the fastening assembly and the loading assembly are installed on the rack, and the fastening assembly is installed on the rack and used for clamping a model ice beam; the loading assembly is installed on the machine frame and used for applying load to the free end of the model ice beam, the loading assembly comprises a loading head, the loading head is arranged in the Y-axis direction, and the size of the loading head in the Y-axis direction is matched with the width size of the model ice beam, so that it is ensured that the load applied by the loading head perpendicularly passes through the center axis of the clamped model ice beam, and the loading efficiency is improved. Additional torque or axial force caused by eccentric loading is avoided, so that simulation of a pure bending stress state is realized. The testing device provided by the invention solves the technical problem of inaccurate measurement caused by difficulty in realizing accurate loading of brittle materials such as model ice in a bending strength test.

The utility model discloses anti-deformation C-shaped steel, which relates to the technical field of C-shaped steel and comprises a support and C-shaped steel, a plurality of groups of first fixing blocks are fixed at the top end of the support, the C-shaped steel is fixed at one end of each first fixing block, and each C-shaped steel comprises a bolt, a fixing cylinder, a C-shaped plate, a chute, a second fixing block and a C-shaped shell. Two sets of second fixing blocks are fixed in the C-shaped steel, sliding grooves are formed in the second fixing blocks, and a bolt in threaded connection with the C-shaped plate penetrates through the interior of the C-shaped steel. The C-shaped steel is primarily fixed through the bolt, then the adjusting bolt on the C-shaped steel is rotated to drive the C-shaped steel to vertically move downwards along the thread, the torsion resistance is greatly improved, the first inclined plate and the second inclined plate which are orthogonally distributed are welded in the C-shaped steel, an inner cavity of the C-shaped steel is divided into triangular stable cavities, and the structure disperses external loads through geometric rigidity, so that the torsion resistance is improved. And the eccentric load resisting capacity is remarkably enhanced, the method is suitable for dynamic or high-load scenes, and higher structural stability is achieved.

This application proposes a method and apparatus for obtaining elastic mechanical parameters of hard rock under eccentric loading conditions, belonging to the technical fields of optical measurement and numerical simulation. The method includes: obtaining a first displacement through a uniaxial loading experiment; introducing an eccentric loading coefficient and calculating a second displacement in finite element software; establishing a multi-objective error function based on the first and second displacements; outputting the final elastic modulus, Poisson's ratio, and eccentric loading coefficient when the multi-objective error function reaches the convergence condition; and iteratively optimizing the mechanical parameters using a simulated annealing particle swarm optimization algorithm improved by a dynamic cooling strategy based on particle swarm diversity, incorporating the eccentric loading coefficient into the parameters to be inverted, using the method of this application. This method realizes the inversion analysis of rock elastic mechanical parameters and eccentric loading coefficient, and improves the inversion accuracy by using an improved simulated annealing algorithm.

This invention belongs to the field of tower installation and discloses a self-climbing tower, comprising: a lifting frame disposed at the top of the tower, with a lifting device slidably disposed on the upper end surface of the lifting frame; self-lifting devices disposed on the outer side of the tower column; and a gravity balancing component; wherein, the gravity balancing component is configured to generate a balancing torque opposite to the overturning moment caused by the movement of the lifting device when the lifting device moves laterally along the crossbeam, so as to maintain the dynamic stability of the portal tower. By generating a reverse balancing torque in real time when the lifting device moves laterally, the gravity balancing component converts the dynamic overturning moment into the internal force of the system, so that the overall center of gravity is always maintained in the middle region of the tower, effectively suppressing the structural vibration and instability risk caused by eccentric loading, and ensuring the safety and stability of the tower throughout the entire operation cycle of hoisting, lateral movement and jacking.

This invention belongs to the field of experimental technology for eccentrically compressed components, specifically relating to an eccentrically compressed loading device for steel lattice columns and its loading method. It includes a test bench, with an upper loading component fixed to the upper end of the test bench. The upper loading component is fixedly connected to a vertical reaction frame via a constraint component. The upper loading component includes a loading box component, with a steel sleeve structure externally disposed on the loading box component. The steel sleeve structure is fixedly connected to the side wall of the actuator cylinder via turnbuckles. A hydraulic actuator and an eccentric structure are disposed between the actuator cylinder and the steel sleeve structure. This invention closely matches the boundary conditions and stress state of eccentrically compressed steel lattice columns with rigid column bases and hinged column tops in actual engineering. It effectively solves the problems of localized damage to the steel column head and the tendency for overall in-plane lateral displacement of steel lattice columns during eccentric loading. It exhibits strong experimental stability, convenient installation, and simple operation, and can meet the requirements for eccentric loading devices for other types of large-size steel components.

The invention discloses a method for testing the anti-overturning performance of a reinforced single-column pier bridge, and relates to the technical field of bridge assessment, and the method comprises the steps: obtaining bridge structure parameters, building a finite element model containing a reinforced structure to simulate working conditions, and recognizing the most unfavorable section; a loading and measuring scheme is formulated according to the loading and measuring scheme, hierarchical synchronous jacking is executed through a PLC jacking system, and dead-load support counterforce is obtained; then unbalanced load distribution jacking is conducted, and the vertical rigidity of the support is obtained through fitting of collected force and displacement data; then eccentric loading is carried out, and a rigidity value is used for converting counter force of an eccentric load support; and finally, the most unfavorable load is arranged based on the influence line, the response of the reinforcing component is monitored, the reaction force and the anti-overturning stability coefficient are checked by integrating all data, and finally, an anti-overturning performance and reinforcing effect evaluation report of the reinforced bridge is output. According to the method, accurate evaluation of the whole process from theoretical analysis to field actual measurement is achieved, and a crucial decision basis is provided for operation safety and later maintenance of the reinforced single-column pier bridge.

The invention belongs to the field of aviation structure strength analysis, and particularly relates to a method and a device for determining stress at the tail end of a stringer of a composite wallboard. The method comprises the following steps: S1, determining an additional bending moment of an eccentric load generated by a tensile load at the tail end of a stringer of the composite material wallboard; s2, determining the section inertia moment of the tail end section of the wallboard stringer according to the width and thickness parameters of the wallboard stringer; s3, according to the additional bending moment of the eccentric load, the bending moment of the eccentric load and the sectional inertia moment, the maximum tensile stress on the tail end section caused by the eccentric load is determined; and S4, determining the total maximum stress of the tail end section according to the maximum tensile stress and the stress caused by the tensile load. According to the method, the stress level of the tail end can be quickly obtained, so that the tail end of the stringer of the composite material wallboard can be checked and designed according to the magnitude of the borne eccentric load.