966 results about "Bending moment" patented technology

The present invention proposes an intermediate diaphragm-free, suspended formwork-free, and negative moment tooth block-free beam bridge, and a design method thereof. The beam bridge includes prefabricated main girders, a wet joint, lower structures, and pier cap transverse beams above the lower structures. The concrete deck slabs of adjacent prefabricated main girders are connected by the wet joint. The design method of the above beam bridge includes the following steps: S1, initial design of the main girders; S2, calculation of the non-uniform deflection of the main girders and the indirect transverse stress of the deck slabs; S3, calculation of the direct transverse stress of the deck slabs; S4, crack resistance verification of the deck slab; S5, optimization of bridge parameters to reduce the stress on the driving surface; S6, completion of the beam bridge design. The beam bridge and its design method effectively solve the problem that the existing intermediate diaphragm-free beam bridge is prone to longitudinal cracking at the joints, and realize the suspension tension without the wet joint suspended formwork of the deck slab and the negative bending moment tendon, and have better mechanical properties and better economic, environmental and social benefits, which can facilitate the promotion and application of such bridges in various types of highways , railways and municipal engineering.

The invention discloses an insertion tube and a manufacturing method thereof, an insertion part and an endoscope, and relates to the technical field of medical instruments, the insertion tube comprises an insertion body and an elastic tube, a first reinforcing layer and a second reinforcing layer are arranged in the insertion body, the second reinforcing layer is arranged outside the first reinforcing layer in a surrounding mode, and the first reinforcing layer is provided with a concave part. The first reinforcing layer and the second reinforcing layer can form double limiting and wrapping supporting on the elastic pipe, the concave shape of the concave part of the first reinforcing layer is utilized to be attached to the outer wall outline of the elastic pipe, and the outer side of the second reinforcing layer is matched for enclosing and restraining, so that the installation stability of the elastic pipe in the first channel can be greatly improved; bending moment generated by self-gravity, external force and the like of the elastic tube is effectively counteracted, the elastic tube is prevented from being bent under the action of self-gravity, external force and the like, the whole insertion tube is prevented from deforming along with bending of the elastic tube, and the form stability of the insertion tube in the cavity in the propelling process is guaranteed. And the straightness of a traction rope transmission path and the accurate conduction of a control instruction are ensured.

Disclosed in the present invention are high-rise pile cap equipment under a horizontal load and a centrifuge test method for foundation bearing characteristics thereof. The equipment comprises a model box, a sand layer, a model pile cap, at least eight model piles, a horizontal loading device, at least two laser displacement sensors, an axial force sensor, and a plurality of strain gauges. The method comprises: S1, performing one-way horizontal loading on high-rise pile cap equipment under a horizontal load to obtain an ultimate foundation bearing capacity situation, a model pile body axial force distribution situation, a pile foundation axial force comparison situation, a model pile body bending moment distribution situation, and a model pile body bending moment comparison situation of the equipment; and S2, performing one-way variable amplitude cyclic loading on the high-rise pile cap equipment under the horizontal load to obtain a foundation displacement situation, an effect of the number of cycles on foundation stiffness, an effect of a cyclic load amplitude on the foundation stiffness, and a foundation inclination situation. In this way, the foundation design of the high-rise pile cap can be optimized, and a basis and a reference for evaluating safety of foundation long-term service are provided.

The invention discloses a two-degree-of-freedom clamp capable of adjusting the bending moment and direction of a turbine blade and a test method. The two-degree-of-freedom clamp comprises a blade clamping component, an upper adjustable U-shaped head, a lower adjustable U-shaped head, an upper clamping rod and a lower clamping rod. The blade clamping component is in threaded connection with the upper adjustable U-shaped head and the lower adjustable U-shaped head, the other end of the upper adjustable U-shaped head and the other end of the lower adjustable U-shaped head are connected with the upper clamping rod and the lower clamping rod respectively, and the other end of the upper clamping rod and the other end of the lower clamping rod are connected with an upper clamping head and a lower clamping head of the fatigue testing machine respectively. The upper clamping rod and the upper adjustable U-shaped head are adjustably connected in pairs in the transverse direction intersecting with the vertical axis so as to adjust the eccentricity of the turbine blade load. The eccentric angle of the blade load can be adjusted by adjusting the rotation cycle of the blade clamping component. According to the clamp disclosed by the invention, by adjusting the eccentricity and the eccentricity angle during a turbine blade test, different bending moment directions and relative sizes of different sections during the turbine blade test can be realized, so that the aim of simulating a real load is fulfilled.

The invention relates to a bending moment-torque composite loading device for testing the load capacity of a steering engine, and belongs to the technical field of ammunition weapon system testing. In the device, the pressure head, the pressurizing rod and the composite loading slip ring synchronously rotate along with the rotation of the rudder wing, so that the applied pressure can be ensured to be always perpendicular to the rudder surface and is closer to the real wind resistance working condition during flight. The bending moment output device and the torque output device are coupled together through the composite loading slip ring, so that the bending moment and the torque can be loaded at the same time and are closer to the actual flight condition.

According to the method for designing the reasonable arch axis of the large-span arch bridge based on the hybrid calculation algorithm and the self-adaptive load distribution, an analytic equation method, a curve fitting method and an intelligent optimization algorithm are combined, and by selecting the initial arch axis, introducing a dynamic load distribution model and applying a genetic algorithm and a particle swarm optimization algorithm, the reasonable arch axis of the large-span arch bridge is designed. Global and local optimization is carried out, and the optimal shape and load distribution of the arch axis are ensured. And finally outputting design parameters, such as a control point, a bending moment, thrust and the like. According to the method, the design precision, flexibility and safety can be effectively improved, the material utilization rate is optimized, the cost is reduced, and the method is particularly suitable for design of large-span bridges and has high practical value.

The embodiment of the invention provides a load balancing control method of a variable pitch system, which comprises the following steps of: continuously acquiring blade root bending moment and rotor azimuth angle signals, accurately preprocessing to obtain 1P harmonic information of bending moment in a flapping direction, and updating accumulated wear conditions of each blade under different azimuth angles in real time based on the 1P harmonic information. According to the method, a dynamic abrasion map is established, the active balance variable pitch offset is actively calculated based on the abrasion map, the load is intelligently guided from a heavily-abraded area to a lightly-abraded area, and a refined blade variable pitch angle is finally formed in combination with traditional IPC correction and a collective variable pitch instruction. In this way, key components such as the variable pitch bearing are prevented from bearing overhigh local stress for a long time in a specific azimuth angle, uniform abrasion of rolling bodies or raceways is achieved, and therefore local fatigue damage is remarkably reduced, and the service life of the variable pitch bearing of the wind generating set and the service life of related components are prolonged.

A multi-axial spine testing system includes a physiological motion unit (PMU); a uni-axial test frame having an input; and a fixture configured to be attached to the test frame and facilitates a plurality of primary motions of one or more of the PMU and the fixture. The plurality of primary motions includes a linear motion of the input and a rotational movement of an output. The fixture has an upper assembly directly or indirectly coupled to the input. The upper assembly transfers the linear motion (Tz) of the actuator to the rotational movement (Rx) of the output. The upper assembly and lower assembly apply a bending moment (MX) and an axial compression (Fz) to the PMU. An external transducer collects data related to or generated by at least the plurality of primary motions. The fixture simultaneously provides the bending motion and axial compression to the PMU.

The invention discloses a compression test clamping tool, system and method for a variable-thickness beveled laminated plate composite material, and relates to the technical field of aviation composite material mechanical property testing. The first long chuck and the second long chuck are respectively mounted on a variable-thickness side and an equal-thickness side of the beveled laminated plate sample, and the first long chuck mounted on the variable-thickness side is gradually thickened on a conical beveled layer and a thin section of the beveled laminated plate sample. According to the invention, the additional bending moment caused by eccentricity of a neutral shaft is effectively inhibited through the gradually-changed thickening design of the variable-thickness side long chuck in cooperation with gap control, and active inhibition of buckling instability of a beveling area is realized in combination with rigid fixation and surface roughening treatment of the short chuck; the method has the advantages that buckling instability is restrained, a failure area is accurately positioned, and samples of different configurations are adapted.

The invention discloses a method for detecting and evaluating anchor bolt cage foundation damage after tower falling of a wind turbine generator, and relates to the technical field of anchor bolt cage damage evaluation.The method comprises the following steps that the position of a tower falling point is determined; dividing tower falling modes according to the distance between the tower falling point and the foundation; performing appearance detection; formulating a field detection scheme based on the determined tower inversion mode; obtaining a load-displacement curve when the anchor bolt is tensioned and unloaded; a tower falling action bending moment calculation method is determined, and tower falling action bending moment is calculated; carrying out checking calculation on the tensile bearing capacity of the anchor bolt and the local pressure bearing capacity of concrete around the lower anchor plate, and determining the damage degree and damage location of a lower anchoring area; and compiling an anchor bolt foundation damage detection report. According to the method, the tower falling mode is divided, a targeted detection scheme is formulated, the plastic damage of the lower anchoring area is analyzed in combination with a pre-tension force removal anchor bolt tension test, meanwhile, the tower falling action bending moment is calculated based on the tower falling mode, bearing capacity checking calculation is carried out, and accurate detection of anchor bolt cage foundation damage and evaluation of residual bearing capacity can be achieved.

The invention relates to the technical field of cable-stayed bridge construction, in particular to a cable-stayed bridge cable force determination method based on process control, which comprises a cable-stayed bridge cable tower, a stay cable and a main beam section, a finite element model is established according to the sizes of the cable tower and the main beam section, and after the zero section in the main beam section is simulated and installed, the zero section is determined. Installing first segments on the left side and the right side of the zero segment respectively, tensioning prestressed steel beams in the first segments, operating a finite element model, recording bending moment values of beam ends of the first segments, setting virtual support constraint node vertical and torsional displacement at the beam ends of the first segments, operating a calculation model, and calculating the bending moment values of the first segments; and the vertical counter force and the virtual bending moment value borne by the virtual support are recorded, the virtual support is deleted, a stay cable unit is established between the preset anchor point of the first section and the cable tower anchor point, and different stay cable body internal force is set twice.

A method and apparatus for testing a specimen with pressure, applying a torque using one or more plates coupled to the test specimen, applying a bending moment, and / or applying an axial load, either separately or simultaneously, with or without rotating the specimen, and without the applied forces interfering with each other.

The invention discloses a tractor chassis forging and drawing device and relates to the technical field of high-horsepower tractor production, the tractor chassis forging and drawing device comprises a machine base and a supporting assembly, a mold is arranged at one end of the top of the machine base, a chain conveyor is arranged in the machine base, a moving trolley is connected to the top of the machine base, and a clamp is arranged at the top of the moving trolley; the supporting assembly is connected to one side of the moving trolley and comprises a driving plate. Automatic lifting of the supporting mechanism is achieved through magnetic attraction linkage, when the moving trolley is away from the mold, a magnet drives a sliding block to drive a guide base to move, a sliding column ascends to a transverse groove along an inclined groove to be locked, a supporting rod pushes a pulley to make contact with the bottom of a bar to form supporting, and a suspended section between a mold outlet and a clamping point is effectively eliminated through the design; and stress field deviation caused by bending moment generated by the dead weight of the bar is avoided, the pulley structure provides stable bearing and can reduce surface scratches, and the drawing process quality is remarkably improved.

The invention relates to the technical field of rockets, in particular to a supporting device for a rocket and a transferring and erecting integrated launching vehicle. The supporting device comprises an erecting arm body and a plurality of auxiliary supporting mechanisms. The auxiliary supporting mechanism comprises a supporting bracket, a disc spring force limiter and at least two linear guide rails. The pre-pressure of the disc spring force limiter is adjustable, so that the rigidity of the supporting bracket is matched with the rigidity of the rocket body; the linear guide rails are arranged on the two sides of the supporting bracket respectively. According to the supporting device for the rocket and the transferring and erecting integrated launching vehicle, the supporting bracket is kept to be in a balanced state through the linear guide rail, the floating function is achieved, and the clamping stagnation phenomenon is prevented; force limiting supporting is achieved by adjusting the pre-pressure of the disc spring force limiter, the rigidity of the supporting bracket is made to be close to the rigidity of a rocket body, and therefore it is guaranteed that the additional bending moment cross section load generated by the erecting arm to the rocket is within the allowable range.

The invention discloses a flexible support design method for a spatial large-aperture reflector and a support structure, and relates to the field of quasi-kinematics support design of large-aperture spatial reflectors. According to the method, a titanium alloy material is selected, parameters such as the size of a connecting frame and the total height of a Bipod support are determined according to the quality of a reflector, the size of a glue spot and an installation space, a cross-shaped blade flexible element is designed to serve as a flexible knot, a three-dimensional parameterized model is established and imported into finite element analysis software, and the three-dimensional parameterized model is obtained. And optimizing structural parameters by taking the RMS value of the optical surface deformation of the reflector as a judgment standard, and finally carrying out dynamic verification such as modal analysis and random vibration analysis. According to the supporting structure, rigidity and flexibility are balanced through a flexible joint, thermal stress can be released, rigidity in the optical axis direction is guaranteed, the bending moment and the influence of machining and assembling errors are reduced, the supporting structure is suitable for reliable supporting of the spatial large-aperture silicon carbide reflector, and the positioning precision and the surface shape precision of the reflector during on-orbit work are effectively guaranteed.

The invention discloses a method and system for determining the optimal stress orientation of a concrete special-shaped sheet column, and relates to the technical field of constructional engineering. According to the method, a correlation model of special-shaped contour parameters and load conditions is constructed, a mechanical property key direction set is extracted, the screening range is narrowed, the optimal orientation determination efficiency is greatly improved, the design period is shortened, and the optimal orientation determination efficiency is improved based on multi-dimensional screening of all-circumferential inertia moment distribution, a rigidity curve and a bending moment contribution ratio. Core indexes such as section ultimate bearing capacity and ductility are comprehensively evaluated by combining stress simulation of a concrete nonlinear constitutive relation; through overall structure collaborative checking calculation and node stress analysis, it is ensured that the orientation meets the mechanical requirements of components and adapts to lateral force resistance and stress continuity of the overall structure, in combination with building construction requirements and node compressive strength redundancy optimization, the scheme of optimal mechanics but construction conflicts is eliminated, safety redundancy is reserved, the structure anti-disaster stability is guaranteed, and the construction safety is improved. And meanwhile, the method adapts to complex working conditions and specification requirements and ensures that the scheme can be directly applied.

The invention discloses an accurate prediction method for vertical deformation of adjacent tunnels caused by foundation pit excavation under the action of lateral soil mass, which comprises the following steps: firstly, determining size parameters of a foundation pit and an existing tunnel and physical and mechanical parameters of the tunnel and the soil mass, determining a stress mode of the tunnel and a model sketch of interaction between the foundation pit and the tunnel, and determining additional stress of the tunnel; then establishing a total energy formula of a tunnel upheaval deformation system of a Pasternak foundation model considering the influence of a lateral soil body and axial internal force of the tunnel, and obtaining a tunnel upheaval deformation w matrix analysis based on an energy variation principle; and finally, according to an Euler-Bernoulli beam theory, a bending moment expression and a shearing force expression of the tunnel are obtained. According to the method, the influence of the lateral soil body and the axial internal force of the tunnel on tunnel deformation is considered on the basis of the Pasternak foundation model, so that the data obtained through calculation more conforms to the measured value, matrix analysis is simple and practical, and the method has guiding significance on prediction of vertical deformation of the adjacent tunnel caused by foundation pit excavation.

The invention discloses a cutter wear monitoring method based on a physical guidance dynamic gating chart convolution framework, and the method comprises the steps: 1, collecting a cutting force signal, a bending moment signal and a vibration signal of a cutter and a workpiece in the operation process of the cutter; 2, performing data preprocessing on the acquired multi-source sensor signal sequence; 3, calculating a Pearson correlation coefficient between each feature in the original feature set and the tool wear; 4, screening the first Top-k features to construct a sensitive feature set integrating force, vibration and bending moment; 5, extracting cutter wear information in the sensitive feature set by adopting a dynamic gated graph convolutional network, and establishing long-term dependency between features; and 6, performing output decoding on the features after the long-term dependency is established, establishing a mapping relation between the tool wear value and the input features, and outputting a tool wear monitoring value. According to the method, deep fusion of the graph structure and the time sequence features is realized, and the accuracy and stability of tool wear prediction are effectively enhanced.

The embodiment of the invention relates to the technical field of rotary joint testing, one embodiment of the invention provides a rotary joint test board used for testing a rotary joint, the rotary joint is provided with a first joint part and a second joint part which rotate relatively, and the rotary joint test board comprises a frame body; the seat body is arranged on the frame body and used for being connected with the first connector part; one end of the rotating part is provided with a free end, and the other end of the rotating part is used for being connected with the second connector part; the swing driving assembly is arranged on the frame body, connected with the rotating part and used for driving the rotating part to rotate; and the free end is rotationally arranged relative to the bending moment assembly, and the bending moment assembly acts on the free end in the radial direction of the rotating piece and is used for providing torque for deflection of the center shaft of the second connector part relative to the center shaft of the second connector part. Through the technical scheme, the technical problem that a rotary joint test device in the prior art is difficult to meet the performance test requirement of the rotary joint is solved.

The invention discloses a multi-axial force sensor with force measuring beams with high lateral force sensitivity and strong bending resistance, the multi-axial force sensor comprises a first table body, a second table body and a plurality of force measuring beams, the force measuring beams comprise a transverse force measuring beam and a vertical force measuring beam, the vertical force measuring beam comprises two sheet-shaped vertical beam arms which are parallel to each other, and the two sheet-shaped vertical beam arms are parallel to each other. The orientation of the larger side faces of the two thin-sheet-shaped vertical beam arms is consistent with the extending direction of the two ends of the transverse force measuring beam, and the two vertical beam arms are located on the two sides of the center line of the transverse force measuring beam respectively. The thin vertical beam arms are adopted, when the thin vertical beam arms are subjected to lateral force, deformation of the vertical beam arms is large, high sensitivity of the lateral force can be obtained, meanwhile, the vertical force measuring beam adopts a double-beam form of a thin-wall structure, the two vertical beam arms are separated by a certain distance, and the two vertical beam arms bear bending moment together, so that the force measuring beam can bear large bending moment. That is to say, the force measuring beam can maintain strong bending resistance on the basis of realizing high lateral force sensitivity.

The invention discloses a corrugated steel web box girder hogging moment area shear nail push-out test device and method.The corrugated steel web box girder hogging moment area shear nail push-out test device comprises a corrugated steel web combined box girder, a loading frame, a pulley support, a jack and a displacement measuring device, and a reinforced concrete plate of the corrugated steel web combined box girder is connected with a corrugated steel web through shear nails; the cross beam of the loading frame applies symmetrical vertical pressure to the reinforced concrete slab through the jack, the stand column applies horizontal push-out force to the lower sliding support through the jack, the reinforced concrete slab is pushed out of the top face of the steel box girder, and a shearing force sliding curve is recorded through the displacement measuring device and the pressure sensor. Through a two-way loading mode of first vertical and then horizontal, the shear bearing capacity of the shear nail under the actual cracking condition of a hogging moment region concrete slab is more effectively simulated, a test device for only applying one-way force to the shear nail is improved, the real stress condition of the continuous beam bridge hogging moment region is met, and the displacement measurement device is simple in structure, stable in clamping and high in practicability. The relative slippage of the shear nails is effectively measured.

The invention relates to the technical field of bionic robots, in particular to a PVC gel efficient composite swing propelling structure for medium and large bionic fishes, which comprises a plurality of swing joints connected in series; each swing joint comprises a structural part and two swing units, and each structural part comprises a driving force collecting plate, a cover plate, a bottom plate and a ridge plate; the two swing units are arranged between the cover plate and the bottom plate, and each swing unit comprises a PVC gel driver and a displacement amplification mechanism; one end of the PVC gel driver is fixed to the bottom plate, the other end of the PVC gel driver is connected with the displacement amplifying mechanism through the driving force collecting plate, and the displacement output tail end of the displacement amplifying mechanism makes contact with the boss of the cover plate. The displacement amplification mechanism is used for increasing the width (in the z direction) of the swing joint under the same PVC gel deformation condition so as to maintain or amplify the bending swing angle, so that the body type and the propelling performance of the bionic robotic fish are improved, and the bionic robotic fish has the advantages that the structure and the process are simple, and the swing angle and the bending moment can be well regulated and controlled.

The invention discloses a frame structure design method based on rigidity reduction. The method comprises the following steps that 1, rod end bending moments Mb and Mc and axial force Nc of frame beams and columns are obtained through calculation; step 2, obtaining actual reinforcement areas Asb0 and Asc0, section sizes and concrete strength of frame beams and columns; 3, the equivalent stiffness Kb1 of the frame beam is obtained through calculation according to the formula Kb1 = Mb0.75y / phi b0.75y; 4, the equivalent stiffness Kc1 of the frame column is obtained through calculation according to the formula Kc1 = Mc0.75y / phi c0.75y; 5, comparing the equivalent stiffness of the frame beam and the frame column with the initial flexural stiffness, and ending after the deviation is less than or equal to 15%; 6, calculating a shear force design value of the frame beam, calculating stirrups needing to be configured for the frame beam, and rechecking a shear-resistant section; and 7, calculating a shear force design value of the frame column, calculating stirrups needing to be configured for the frame column, and rechecking a shear-resistant section. Compared with the prior art, an overall calculation model of the frame structure is established, the real rigidity of a structural member is obtained through multiple iterations, section reinforcement is optimized, and the reinforcement amount is reduced; and the overall anti-seismic performance is improved.

The present invention discloses a method for calculating the negative bending moment impact coefficient of small and medium span prefabricated continuous beam bridges based on a quasi-design state, including the following processes: determining the second-order vertical bending frequency of the bridge; determining the bridge deck roughness grade; and calculating the negative bending moment impact coefficient under the unevenness grade of the bridge deck using the second-order vertical bending frequency of the bridge. Based on the quasi-design state of the bridge, the present invention calculates the impact coefficient using the measured second-order frequency and roughness data of the bridge; at the same time, it can also adjust the impact coefficient assessment standard in a timely manner according to the degree of deterioration of the road surface grade. Therefore, the present invention can realize the evaluation of the negative bending moment impact coefficient of the continuous beam bridge according to the bridge deck condition in different operation periods, and has stronger pertinence and wider applicability.

The invention relates to the technical field of roller body welding equipment, and discloses roller body welding equipment and a technology, the roller body welding equipment comprises a welding table, a bearing and transferring assembly is arranged on the welding table, the bearing and transferring assembly comprises supporting plates symmetrically and fixedly arranged at the two ends of the welding table, and a plurality of first air cylinders are fixedly arranged at the lower ends of the supporting plates; the surface of a piston rod of the first air cylinder is sleeved with the same bottom plate, a two-way lead screw is rotationally arranged in the bottom plate, sliding blocks are symmetrically connected to the surface of the two-way lead screw in a threaded mode, a first bearing plate and a second bearing plate are arranged between the two symmetrical sliding blocks, and a sliding groove matched with the second bearing plate is formed in one side of the first bearing plate. By means of the cooperation of the first bearing plate and the second bearing plate which can be connected in a sliding and sleeving mode, a roller body can be stably borne and accurately transferred to the designated position of the welding table, and the roller body slowly rolls to the bearing platform along the inclined face by means of the self weight during discharging; and the non-uniform additional bending moment and shearing force caused by the dead weight of the roller body in the traditional three-point hoisting to a welding seam area are effectively avoided.

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 discloses a stress and displacement calculation method for multiple rows of anti-slide piles of a reinforced foundation covering type landslide. The method is simple and reasonable in concept and easy to operate. The method comprises the steps that 10, all rows of anti-slide piles are sequentially numbered from 1 to N from the front edge of a slope body; 20, the landslide thrust on the rear side of the loaded section of the N-th row of anti-slide piles is calculated; 30, representing the linear distribution resistance of the front sliding body to the load-bearing section and the horizontal displacement of the load-bearing section; 40, the bending moment M0 and the shearing force Q0 of the bottom end of the loaded section are obtained; 50, obtaining the horizontal displacement x0 and the rotation angle theta0 of the bottom end of the load-bearing section; step 60, simultaneous solution is carried out to obtain x0 and theta0; step 70, obtaining the horizontal displacement and the internal force of the loaded section; 80, the horizontal displacement and the internal force of the built-in section of the slide-resistant pile are obtained; 90, obtaining landslide thrust acting on the load-bearing section of the (N-1) th row of slide-resistant piles by a slide mass between the Nth row of slide-resistant piles and the (N-1) th row of slide-resistant piles through equivalent conversion; and repeating the steps 20-80, and so on, so as to obtain the internal force and displacement of each row of anti-slide piles.

The invention discloses a composite beam plastic flexural capacity correction calculation method considering interface slippage. The method is suitable for a hogging moment area of a steel-concrete composite beam reinforced by an external prestress carbon fiber reinforced composite material rib. The method comprises the following steps: firstly, determining basic static boundary parameters and a shear connector constitutive model; in the iterative calculation, solving a temporary bearing capacity by utilizing an axial force and moment balance equation, and calculating interface slippage along the beam length and a deformation loss item at the support based on internal force distribution; then determining a rigidity degradation coefficient according to the average slip amount, and dynamically reducing the static yield bending moment to reconstruct the plastic hinge length; and finally, constructing a corrected deformation coordination equation, deducting a deformation loss item in geometric deformation calculation to obtain the real elongation of the in-vitro CFRP rib, and updating a stress parameter until a result is converged. According to the method, by introducing a deformation loss item and a rigidity degradation mechanism, deviation caused by traditional rigid connection assumption is corrected, and accurate prediction of the ultimate bearing capacity is achieved.

The invention provides a steel-concrete composite beam hogging moment region rigidity degradation rule calculation method and a storage medium, and belongs to the technical field of computer-aided calculation. The method comprises the following steps of S100, determining random fatigue loads borne by a hogging moment area of the steel-concrete composite beam, and calculating the amplitude S and the amplitude distribution rule of each fatigue load; s200, performing curve fitting on the amplitude distribution rule of the fatigue load, and determining a probability density function of the amplitude of the fatigue load; s300, determining the fatigue life of the hogging moment area of the steel-concrete composite beam; s400, the static load ultimate bearing bending moment of the hogging moment area of the steel-concrete composite beam is determined; s500, determining a rigidity reduction value of the hogging moment area of the steel-concrete composite beam during fatigue failure; and S600, calculating the rigidity degradation rule of the steel-concrete composite beam under the random fatigue load. According to the method, the rigidity degradation process of the hogging moment area of the steel-concrete composite beam can be calculated and predicted in advance, and a theoretical basis is provided for maintenance and repair of a bridge.

The invention provides an improved CHM-based RC beam fatigue life prediction method and system, and relates to the technical field of RC beam fatigue life prediction, and the method comprises the specific steps: constructing a crack hinge model, splitting an RC beam into a midspan virtual crack hinge and elastic bodies at two sides, collecting section parameters and beam body basic parameters, and carrying out the construction of a crack hinge model; calculating the axial force of the stress component and the bending moment of each axial force to the neutral axis; setting a cycle block division rule, calculating strain and axial force increments, recording cycle times under the current cycle block, and obtaining a balance error value; using a genetic algorithm to optimize section parameters to obtain an optimal combination; and calculating an accumulated damage value, comparing the accumulated damage value with a threshold to judge failure, and if failure, accumulating cycle times to obtain the life. According to the method, the damage difference of different stress amplitudes under the same deflection is accurately distinguished, a reliable basis of a mechanical level is provided for life prediction, an evolution chain from crack propagation to stress redistribution to damage acceleration is truly restored, and the model is highly matched with the true damage process of the RC beam.