238 results about "Shearing deformation" patented technology

The invention provides a shield tunnel construction period segment longitudinal dynamic floating prediction method, and relates to the field of shield tunnel segment floating prediction.The method comprises the steps that the static upward floating force and the dynamic upward floating force of a shield tunnel are calculated by considering the timeliness of slurry, and the characteristic of nonlinear change of the rigidity of a circular seam connector is considered; the method comprises the following steps: dividing bending-resistant and shearing-resistant deformation modes of a circular seam joint, further deducing bending rigidity and shearing rigidity of a tenon-type joint in each deformation stage, deducing a shield tail segment longitudinal floating prediction model of the circular seam joint in the shield tunnel construction period, and constructing a nonlinear iterative algorithm of shield tunnel longitudinal deformation according to the theories; and acquiring parameter data of actual engineering, and inputting the parameter data into the duct piece floating prediction model to obtain a duct piece floating value. By means of the method, accurate prediction of floating deformation of the shield tail segment in large shield tunneling can be achieved, an effective scientific basis is provided for large-diameter shield tunneling construction, the problems that parameter decision of shield tunneling machine operators is difficult, and the segment floating control effect is poor are solved, and structural diseases caused by too large floating of the shield tail segment are eliminated.

The invention relates to the technical field of machine learning, in particular to a rock and soil stability prediction method and system based on machine learning, and the method comprises the following steps: extracting shear stress, displacement and energy dissipation rate time series data, calculating the stress change rate of adjacent time steps, screening the stress increment sudden change period, and calculating the shear deformation gradient change rate. Mutation points in the strain direction are screened, and a key variable interval is obtained. According to the method, traditional analysis limitation is broken through by combining displacement-stress second derivative and energy dissipation rate cross validation, a hardening-softening conversion area is dynamically identified, multi-stage strain gradient differences are compared to establish a space-time correlation parameter system, and static and dynamic parameter conversion is realized by using a strain increment space gradient tracking technology; and quantitative mechanical interaction and energy dissipation collaborative analysis is carried out to describe a stress diffusion path, stress release characteristics and deformation gradient distribution are fused to construct a fracture principal direction multi-dimensional verification mechanism, and a microscopic fracture and macroscopic instability correlation model is established.

The invention belongs to the technical field of direct shear-seepage tests of rock joints, and discloses a numerical test method for direct shear-seepage of rock joints under different boundary conditions, which comprises the following steps of: establishing a joint surface numerical model by using finite element software, and performing tests for simulating joint shear mechanical behaviors by applying different boundary conditions. And the contact state and the opening distribution of the joint surface under different shear displacements are obtained, so that the shear stress evolution mechanism of the joint surface is better revealed, and the mechanical behavior of the rough joint surface in the shear process is accurately expressed. According to the method, the evolution law of mechanical properties in the joint shearing process can be reflected, the influence of shearing deformation on the joint seepage characteristics can be reflected, joint opening data distribution is imported into programming software to be processed, a joint seepage numerical model is constructed, then multi-physics field simulation analysis software is imported, and the joint seepage performance is improved. The flow velocity, the osmotic pressure and the streamline distribution characteristics in the flowing process are calculated, so that the joint permeability characteristics are analyzed.

The invention relates to the technical field of rubber material performance detection, in particular to a dynamic test platform and method for evaluating the bonding effect and fatigue life of rubber and a rubber cord fabric. The dynamic test platform comprises a driving mechanism, a test platform, a clamping mechanism, a monitoring system, a data acquisition module, a control system and a data analysis module. The driving mechanism can adjust the frequency, the displacement amplitude and the acceleration of loading deformation; the test platform supports normal loading pressure to realize simulation of different load working conditions; the clamping mechanism is a two-way adjustable clamp, and free displacement is achieved through a sliding rail mechanism; the monitoring system integrates a force sensor, a displacement sensor and a temperature sensor. The data acquisition module records loading process data; the control system sets parameters through a touch interface and monitors the test in real time; and the data analysis module generates an adhesion performance, fatigue life and damage form evaluation report based on an algorithm. The device can accurately reproduce the adhesive property change under the dynamic working condition, comprehensively analyzes the adhesive strength and fatigue life, provides a scientific basis for research and development and quality control of rubber products, and is suitable for testing the adhesive property of composite materials such as tires and transmission belts.

An internal and external coupling shear resistance locking control system and monitoring method of tunnel surrounding rocks, comprises an internal shear resistance and monitoring system of tunnel surrounding rocks, an external shear resistance and monitoring system of tunnel surrounding rocks, a relative shear displacement monitoring system of the tunnel walls and the roof and floor layers, and an anchor agent installation system; holes are expanded in the anchor cable drilling holes passing through coal-rock interface areas of the coal walls and roof and floor rock layers to form shear misalignment tolerance cavities; monitoring pressure values of measuring bags and liquid discharge in the shear misalignment tolerance cavities to determine shear deformations of the shear misalignment tolerance cavities, monitoring forces on anchor cables, compensating pull rods and shear resistance steel strips, and adjusting the shear resistance of the anchor cable and steel belt through the compensation rod structure.

The invention relates to the technical field of deformation prediction, in particular to a rock high slope excavation anchoring deformation prediction method based on artificial intelligence, and the method comprises the following steps: obtaining multi-source image data, analyzing rock volume and gravity center transfer, extracting a corresponding relation between abnormal stress and displacement, constructing a structure offset path, and screening continuous abnormal features. And extracting a key deformation rate interval to obtain an anchoring deformation trend prediction result. According to the method, the position of an unbalanced section is judged by constructing a gravity center transfer track and a mass difference space sequence and combining a coupling relation between a stress abnormal point and a displacement response direction, a collaborative evolution section of a structure offset path and a stress boundary is extracted, and a continuous abnormal zone is screened according to a crack change and joint fluctuation trend. A key change interval is extracted in combination with the time feature of the shear deformation rate, dynamic judgment of a structural deformation path and an extension direction is completed, and the spatial continuity recognition capability and the time response resolution are enhanced.

The invention aims to provide a device and a method for preparing a fine-grain magnesium alloy pipe, and belongs to the technical field of light metal plastic forming. Differential torsion and continuous shear deformation are generated in the machining process of a magnesium alloy pipe blank, grain refinement and texture weakening are achieved while the torsion direction of the blank is not changed, and the yield of the fine-grain magnesium alloy pipe is improved. Room-temperature mechanical properties of magnesium alloy pipes are improved, and the magnesium alloy application range is widened. By means of the method, the grain refining effect of the magnesium alloy pipe is more remarkable, the basal texture is weakened to a large extent, the obtained fine-grain magnesium alloy pipe is uniform in structure, and the obdurability is greatly improved.

The self-adaptive staged energy consumption friction-shear yield composite damper comprises a friction energy consumption unit, an inner friction plate, an outer friction plate, at least two shear energy consumption units and an H-shaped steel plate, wherein the inner friction plate and the outer friction plate are located on the friction energy consumption unit, and the H-shaped steel plate is located at the tail end of the friction energy consumption unit and used for fixing the friction energy consumption unit. The prestressed bolt sequentially penetrates through the inner friction plate and the outer friction plate on the friction energy dissipation unit and the shear energy dissipation unit and is connected with the inner friction plate and the outer friction plate on the friction energy dissipation unit and the shear energy dissipation unit through at least one pair of linkage rods, and the two ends of the friction energy dissipation unit are connected to beam-column joints respectively. The linkage rod does not make contact with a linkage rod penetrating hole of the shearing energy dissipation unit during displacement, and only the friction energy dissipation unit works; and the linkage rods make contact with the linkage rod penetrating holes in a displacement mode, the shear energy dissipation devices are fixed, the shear plates are subjected to shear deformation, and the earthquake displacement response of the structure is effectively reduced through staged energy dissipation and the displacement amplification effect.

The invention belongs to the technical field of mechanical simulation and prediction of woven fabrics, and particularly discloses a modeling method and system for simulating wrinkles of a multi-layer woven fabric, and the method comprises the steps: building a numerical model considering the characteristics of the multi-layer woven fabric, and enabling the multi-layer woven fabric to be formed by stacking single-layer woven fabrics according to a target layering sequence; determining a numerical value implementation method of the numerical value model in the finite element framework, wherein the numerical value implementation method is implemented through a subprogram interface; simulating the wrinkle defect generated in the deformation process of the two-dimensional woven fabric by adopting the finite element framework according to the numerical model through the numerical implementation method; wherein the numerical model is established by simulating tensile deformation, shear deformation and bending deformation of a single-layer fabric through shell units of the multi-layer woven fabric and indirectly simulating compression deformation and interlayer slippage behaviors through contact interaction among the shell units. According to the invention, the accuracy of wrinkle defect simulation of the multi-layer woven fabric can be improved.

The invention discloses a method for calculating the natural vibration frequency of a steel-concrete composite beam under common boundary conditions, and relates to the technical field of high-speed railway bridge construction. The method comprises the steps that material parameters and the cross sectional area of the steel-concrete composite beam are obtained; calculating a dimensionless coefficient according to material parameters and section parameters of the steel-concrete composite beam; according to the dimensionless coefficient, the first frequency reduction coefficient, the bending resistance combination connection coefficient, the second frequency reduction coefficient and the third frequency reduction coefficient; and calculating the natural vibration frequency of the single-span steel-concrete composite beam under the common boundary condition according to the three frequency reduction coefficient calculation expressions. According to the method, the shear deformation influence is considered, the frequency approximate value of the single-span steel-concrete composite beam under any boundary condition can be calculated, the calculation precision is high, and the method is also suitable for other partially-interacted composite beams formed by connecting two different materials through flexible shear connectors.

The utility model discloses a graded energy consumption type seismic mitigation and isolation support, and relates to the technical field of seismic mitigation and isolation supports. The rubber support is connected to the bottom of the spherical support; the bottom basin assembly comprises a bottom plate and supporting stoppers, the supporting stoppers are fixed to the periphery of the bottom plate, the ends, away from the spherical support, of the rubber supports are connected with the bottom plate, the rubber supports are located in the supporting stoppers, and threaded holes are formed in the ends, away from the bottom plate, of the supporting stoppers; and the limiting stop block is fixed in the threaded hole in the supporting stop piece through the anti-shear pin, and the inner edge of the limiting stop block protrudes out of the inner side of the supporting stop piece and is used for limiting the spherical support. The graded energy dissipation function is achieved, when a bridge and a building structure normally operate, the spherical support horizontally moves and turns, and friction energy dissipation of the spherical support is mainly achieved; under the action of an earthquake, the rubber support is subjected to shear deformation, and the spherical support and the rubber support are combined to consume energy.

The waveguide polyurethane laminated shock insulation support comprises an upper connecting plate, a lower connecting plate and a shock absorption body arranged between the upper connecting plate and the lower connecting plate, the upper end face of the shock absorption body is fixed to the bottom face of the upper connecting plate through an upper pressure-bearing wear-resisting layer, and the lower end face of the shock absorption body is fixed to the upper end face of the lower connecting plate through a lower pressure-bearing wear-resisting layer; the damping main body comprises a plurality of multi-layer corrugated steel plates which are distributed up and down and polyurethane elastomers which wrap the multi-layer corrugated steel plates and are alternately vulcanized and tightly attached into a whole. The internal structure of the shock insulation support is optimized, energy is absorbed through waveform deformation during shear deformation, transverse expansion deformation of the polyurethane elastomer is limited under vertical load, the contact area with the polyurethane elastomer is increased, friction force is increased, the energy dissipation capacity is enhanced, and the service life of the shock insulation support is prolonged. The problem that a steel plate and polyurethane are separated or relatively slide due to insufficient binding force of a traditional shock insulation support is solved, the interlayer peeling strength is improved, and the vertical bearing capacity of the support is improved.

The application discloses a processing method of low-cost high-performance tantalum alloy plate, which comprises the following steps: using a firm electrode obtained by uniformly mixing Ta powder, W powder and Nb powder and then welding as raw material, carrying out twice electron beam melting to obtain a large-size tantalum alloy ingot; through primary extrusion on the large-size ingot, repeated operations of turnover forging and shaping and secondary extrusion, a three-time extruded rod blank is obtained; finally, the extruded rod blank is subjected to blanking, intermediate annealing, cross-rolling and product annealing, and the preparation of the tantalum alloy plate is completed. The application uses Nb to replace part of the Ta matrix to prepare a new type of tantalum alloy, and the raw material cost can be reduced by about 1 / 4. Then, through multiple turnover forging and extrusion, cross-extrusion of the ingot is realized, the advantages of shear deformation and dislocation interlacing on grain crushing are fully utilized, the grain size of the prepared plate is above 8.0, and the mechanical properties are better than those of a traditional Ta2.5W alloy, so that the plate can be used as a preferred material for weapon equipment structural parts.

Sample holder for measuring the permeablity of a sample during shear deformation, and associated measuring device and method The invention relates to a sample holder (12) for measuring the permeability during shear deformation of a sample of material consisting of rock powders. The sample holder (12) comprises a central block (28) and at least one, preferably two, lateral block(s) (30, 32), the central block (28) having at least one central interface (34, 36), the or each lateral block (30, 32) having a lateral interface (60, 62). The central block (28) and the at least one lateral block (30, 32) are adapted to receive a sample layer (84, 86) of the sample between the central block (28) and the or each lateral block (30, 32), the sample layer (84, 86) coupling with the central interface (34, 36) on a first side and with the lateral interface (60, 62) on a second side. The invention further relates to a corresponding measuring device and method.

The utility model provides the novel anti-seismic vibration isolation device, the anti-seismic vibration isolation device innovatively integrates the elastic component and the anti-shearing component, and the earthquake energy is effectively absorbed and dispersed through the stacking of multiple layers of elastic bodies and the comb-tooth-shaped embedding design of the anti-shearing component; the elastic assembly adjusts the frequency and isolates vertical and horizontal vibration, and the buffer piece of the anti-shear assembly ensures flexible isolation, improves the horizontal bearing capacity and prevents shear deformation. A plurality of groups of built-in elastic assemblies further enhance energy dissipation, and pre-pressing bolts and nuts limit over-limit displacement, so that the structural stability is ensured. The overall design supports flexible combination, different load requirements are met, and the anti-seismic performance and safety of a building are remarkably improved.

The invention belongs to the technical field of restrained braces, and particularly relates to a viscoelastic double-step all-steel buckling restrained brace which comprises an outer sleeve, two viscoelastic devices, a core plate and a limiting structure, the outer sleeve, the two viscoelastic devices and the core plate are arranged, and the two viscoelastic devices are embedded in the inner side and the outer side of the two ends of the outer sleeve respectively; the viscoelastic material can absorb and dissipate energy generated by earthquakes or wind loads through shear deformation, the vibration response of a structure body is effectively reduced, the anti-seismic performance of a building is improved, the core plate movably penetrates through the viscoelastic device and is arranged in the outer sleeve, the core plate is preliminarily restrained through the outer sleeve, and the anti-seismic performance of the building is improved. According to the limiting structure, the side plates and the multiple limiting plates are matched to limit the core plate, lateral displacement of the core plate can be limited, bending instability of the core plate in the stress process is prevented, it is ensured that the core plate is mainly subjected to axial deformation all the time, and the anti-seismic property of the viscoelastic device is fully exerted.

The present invention relates to the technical field of plastic processing of thin-walled parts, and discloses a method for integrally forming a Γ-shaped ribbed cylindrical part. First, a cylindrical part with nearly Γ-shaped ribs is prepared by shearing and spinning the cylindrical part blank, and gradient heating is applied to the ribs formed by shearing. Then, a flat rotating wheel is used to axially shape the Γ-shaped ribs, and finally a Γ-shaped ribbed cylindrical part is obtained. The present invention proposes a method for integrally forming a Γ-shaped ribbed cylindrical part. This forming method can not only significantly increase the rib height and inhibit cracking, but also facilitates the adjustment of process parameters, thereby realizing the regulation of the shape and size of the Γ-shaped ribbed cylindrical part. It uses local loading of two rotating wheels to put the material in a deformation state in which the shear deformation mode is the main mode and the upsetting deformation is the auxiliary mode, which significantly improves the rib height limit. By introducing a thermal field, the structure can undergo dislocation rearrangement and polygonization through dynamic recovery, thereby reducing deformation resistance and preventing rib cracking.

The utility model discloses a high ductility steel frame-herringbone bracing structure, which relates to the technical field of building steel structures, and comprises a stand column, a beam and a diagonal bracing, the beam comprises a beam web, a beam upper flange and a beam lower flange, the diagonal bracing is connected with the beam through a conversion structure, the conversion structure comprises a first web, a first transverse stiffening rib and a first horizontal stiffening rib, the first web is arranged at the bottom of the beam lower flange and vertically aligned with the beam web, the first horizontal stiffening ribs are fixed to the bottom of the first web, the first transverse stiffening ribs are symmetrically arranged on the two faces of the first web, the inclined struts are fixed to the bottoms of the first horizontal stiffening ribs, and holes are formed in the beam web. The conversion structure facilitates connection of the beam and the inclined strut, the hole is formed in the beam web, the bottom elevation of the hole is flush with the conversion structure, the situation that the shear deformation capacity of the beam at the joint is weakened due to the fact that the conversion structure is additionally arranged can be avoided, and a high-ductility connecting structure is formed.

The present disclosure relates to a tactile presentation device that includes a tactile presentation knob placed on an operation screen and for presenting a tactile sense to a user via the tactile presentation knob. The tactile presentation knob includes a conductive elastic portion that includes a surface layer facing the operation screen and an inner layer located on the side opposite to the operation screen, and an operation part that fixes the conductive elastic portion. The surface layer is set to be subjected to greater shear deformation than the inner layer by an operation of the tactile presentation knob, to generate vibrations by a change in the frictional force, and to be subjected to greater compressive deformation than the inner layer by a press of the tactile presentation knob. The inner layer is set to have higher vibration transmissibility than the surface layer.

This utility model discloses a spiral-grooved vibration-damping tapered shank cutting tool, relating to the technical field of BT-type tapered shank cutting tools. Specifically, it is a spiral-grooved vibration-damping tapered shank cutting tool, comprising a flange and a BT-type tapered shank. The surface of the BT-type tapered shank is provided with spiral grooves, which are filled with elastic damping material. This spiral-grooved vibration-damping tapered shank cutting tool, by designing spiral grooves in the BT-type tapered shank and filling them with elastic damping material, utilizes the multi-head spiral structure of the spiral grooves to disperse vibration energy in multiple directions. At the same time, the elastic damping material absorbs high-frequency vibrations through shear deformation. This "rigid-flexible composite" structural design solves the contradiction between vibration suppression and structural strength in BT-type tapered shank cutting tools, and also provides high structural reliability without affecting the original strength of the BT-type tapered shank. It offers a BT-type tapered shank cutting tool that combines high rigidity, good vibration reduction performance, and low manufacturing cost.

The invention discloses a preparation method of a nano-particle filled magnesium alloy wire for fuse wire additive. The preparation method comprises the following steps of (1) cast ingot extrusion, (2) soaking treatment, (3) drying and heating, (4) continuous extrusion and (5) shaping and sizing. Firstly, nano-particles are evenly adsorbed to the outer surface and an inner cavity of a magnesium alloy pipe in a soaking mode, then a magnesium alloy pipe blank is heated and fused in a continuous extrusion mode and subjected to sufficient shearing deformation, then a wire is extruded, the nano-particles and magnesium alloy are sufficiently fused in the whole process, surface physical adsorption is converted into tight metallurgical bonding, and the magnesium alloy pipe blank is subjected to high-temperature heat treatment. And under the action of violent shear deformation, the nano-particles are dispersed and distributed in the magnesium alloy wire structure, and no nano-particle loss exists.

The present invention discloses a buckling-restrained shear plate damper and its design method, which includes a corrugated buckling-restrained shear energy dissipation plate, an upper end plate and a lower end plate; the upper and lower end plates are connected to the corrugated buckling-restrained shear energy dissipation plate by welding; the corrugated buckling-restrained shear energy dissipation plate is composed of three straight plates and two curved plates that are distributed at intervals in the transverse direction and connected in sequence. The curved plates in this buckling-restrained shear plate damper can effectively reduce out-of-plane buckling. When relative displacement occurs between the upper and lower end plates along the strong axis direction of the energy dissipation plate, the three straight plates of the energy dissipation plate will undergo in-plane shear deformation, and the two curved plates will undergo out-of-plane bending deformation. The bending deformation is along the strong axis direction of the energy dissipation plate, converting the out-of-plane deformation that occurs under large displacement in the middle of the rectangular steel plate web into bending deformation along the strong axis of the energy dissipation plate, thereby reducing the degree of out-of-plane buckling and enhancing the energy dissipation capacity. This damper has many excellent properties such as small out-of-plane buckling degree, good ductility, and strong energy dissipation capacity, and is an ideal energy dissipation component.

The invention relates to the technical field of shear model boxes, and discloses a novel layered shear model box capable of simulating multi-directional vibration. Comprising a circular base, an outer stand column is fixedly connected to the upper surface of the circular base, a first spring is fixedly connected to the side surface of the outer stand column, and an inner annular steel sheet is fixedly connected to the end, away from the outer stand column, of the first spring. Through horizontal movement of the outward-extending steel rod, the outward-extending steel rod can drive the parallel stabilizing wheel to move horizontally, the parallel stabilizing wheel can roll on the surface of the external horizontal supporting rod, the stability of the outward-extending steel rod when the outward-extending steel rod drives the internal annular steel sheet to move horizontally can be improved, and the direct friction force between the outward-extending steel rod and the internal annular steel sheet is small; and the horizontal supporting rods on the external stable frame can play a role in restraining the outwards-extending steel rods, and it is guaranteed that the internal annular steel sheets only conduct shearing deformation in the horizontal direction.

The present invention discloses a flexible control device for the relative displacement of cable beams for improving the service life of short slings of suspension bridges, which belongs to the field of bridge engineering technology. The flexible control device is composed of a damping element, a supporting element and a connecting element. The damping element is composed of a stainless steel wire rope passing through an aluminum alloy fixed mounting plate; the supporting element is a four-sided pyramid steel truss structure; the connecting element includes a base plate, a steel bar, a high-strength bolt, and a cable-free clamp. The steel bar is connected to the stiffening beam through the base plate, the two ends of the damping element are bolted to the corresponding steel bar, and the upper and lower ends of the steel truss are respectively fixed to the cable-free clamp and the steel bar to form a flexible control device. During the vibration process of a long-span suspension bridge, the device consumes energy through the tension, compression, shear and torsional deformation of the damping element, effectively controlling the dynamic relative displacement of the cable beam in the span of the suspension bridge, thereby reducing the stress change and shear deformation amplitude of the short sling, and extending the service life of the short sling.

The invention belongs to the field of rock mechanical property evaluation, and particularly relates to a rock structural surface shear brittleness index obtaining method and a shear brittleness evaluation method. And carrying out a direct shear test on the rock structural surface to obtain a shear stress-displacement whole-process curve, calculating according to the shear stress-displacement whole-process curve to obtain a pre-peak brittleness parameter S1 and a post-peak brittleness parameter S2, and multiplying the pre-peak brittleness parameter S1 and the post-peak brittleness parameter S2 to obtain the shear brittleness index SI of the rock structural surface. According to the method, the shear stress rise rate in the pre-peak loading stage, the shear stress drop amplitude in the post-peak stage and the relative displacement in the residual deformation stage are comprehensively considered, the whole-process shear deformation characteristics of the rock structural surface can be comprehensively reflected, and the required parameters are easily measured through a mechanical test.

The invention relates to the field of anti-galloping vibration reduction of power transmission engineering, in particular to a vibration reduction structure and a method applied to a power transmission line, and the vibration reduction structure comprises a shell, a movable part at least partially located in the shell, and a viscoelastic part arranged between the shell and the movable part; the movable part can move relative to the shell, when the movable part and the shell move relatively, the viscoelastic part deforms to provide damping force, the vibration reduction structure is installed in the power transmission line, when the power transmission line swings or vibrates, the pull rod and the shell move relatively, the viscoelastic layer is subjected to shear deformation, and energy is dissipated. The vibration amplitude of the power transmission line is reduced; when the amplitude of waving or vibration is further increased, the relative displacement between the pull rod and the shell is further increased, and the piston extrudes the viscoelastic balls, so that the viscoelastic balls generate extrusion deformation and mutual friction, energy is dissipated, and the amplitude of vibration is reduced.

The invention discloses a hybrid self-resetting support provided with a rate-dependent viscoelastic damper, which belongs to the technical field of seismic resistance of structural engineering, and comprises an outer pipe, an inner plate, a viscoelastic damper, a shape memory alloy U-shaped damper and channel steel, the viscoelastic damper is formed by stacking a viscoelastic material layer and a steel plate, is fixed between the inner plate and the outer pipe, and is arranged at the end part of the inner plate; when an earthquake acts, the inner plate moves in the axial direction relative to the outer pipe, the viscoelastic material layer is driven to be subjected to shear deformation, and damping force related to the loading frequency is provided; in addition, a plurality of shape memory alloy U-shaped dampers are arranged between the inner plate and the outer pipe at intervals in the supporting axial direction, and the self-resetting capacity is provided through bending deformation. The U-shaped damper and the viscoelastic damper are stressed in parallel, damping energy consumption and restoring force are generated at the same time, the floor acceleration and the base shearing force can be effectively reduced, and the device has the advantages of being simple in structure and reliable in connection.

The invention discloses an overpass bridge pile foundation anti-sedimentation structure in an expansive soil area, and relates to the technical field of pile foundation anti-sedimentation, the overpass bridge pile foundation anti-sedimentation structure comprises a pile foundation structure and an anti-sedimentation mechanism; the anti-settling mechanism comprises a first reinforcing structure and a second reinforcing structure; the bearing plate of the first reinforcing structure penetrates into bed rock through multiple rows of anchor bolts, the uplift bearing capacity is greatly improved compared with the prior art, uplift force of expansive soil can be borne, horizontal thrust is decomposed into axial pressure and shear force through a triangular structure formed by the supporting pieces, local stress concentration of the pile foundation structure is reduced through elastic buffering of an elastic cushion, and the pile foundation structure is more stable. A second reinforcing structure rigidly connects second connecting sleeves of adjacent pile foundation structures through connecting columns, the load dispersion efficiency is improved, differential settlement of adjacent pile foundations is controlled within a small range, an attaching plate of an inclined reinforcing column is attached to the curved surfaces of the pile foundations, the shear rigidity is improved, and the pile foundation structure is suitable for the soil mass with the high expansion grade; the shear deformation of the expansive soil is effectively resisted.

The invention is suitable for the technical field of rubber testing, and provides rubber performance testing equipment which comprises a base, two symmetrically-distributed supporting seats are arranged at the upper end of the base, guide mechanisms are arranged below the supporting seats and used for guiding the supporting seats, and stretching mechanisms are installed on the two sides of the base and used for stretching the supporting seats. The stretching mechanism is connected with the supporting base on the same side and used for pulling the supporting base. Supports are fixedly installed on the supporting bases, clamping mechanisms are installed on the supports and connected with the supporting bases, the supporting bases are guided by arranging inclined blocks, when a first servo motor drives a first rotating shaft to rotate, the inclined blocks rotate around the first rotating shaft, the inclination direction of the inclined faces of the inclined blocks can be adjusted, and therefore the supporting bases are guided to different directions; by adjusting the stretching direction, shear deformation during tire sideslip or composite stress of a pipeline interface can be simulated, a failure mechanism of a material under a real working condition is revealed, and overestimation of a unidirectional test on the durability of the material is avoided.

The present application relates to a kind of tuned mass damper and track structure;The device includes shell and mass, the mass is located in the shell, the mass and the shell are formed with cavity between, the mass and the shell are connected by annular elastic layer, the annular elastic layer separates the first chamber and the second chamber in the cavity, the first chamber and the second chamber are filled with damping fluid in it.The mass of the present application is connected in the shell by annular elastic layer, when working, elastic layer occurs shear deformation, with single natural frequency, reliable tuned vibration absorption is realized, low-frequency vibration influence is reduced, the device is maintenance-free, and operating and maintenance cost is low;Shell can provide good strength, built-in concrete structure will not reduce the strength of concrete structure, and the range of use is wide.