834 results about "Shear force" patented technology

The invention discloses an I-shaped column-full dry type connection RC beam column joint and a connection method, and belongs to the technical field of building structure engineering. The joint comprises a prefabricated I-shaped column, a stepped beam, a shear connector and a U-shaped connecting steel plate. A long bracket and a short bracket are respectively arranged at the top and the bottom of the I-shaped column; the end part of the step-shaped beam is in an inverted step shape and is provided with an extending section; the shear connector is a long-strip-shaped steel member provided with a screw rod; and the U-shaped steel plate is provided with screw holes which are respectively matched with the shear connector and the beam end screw. During connection, rapid assembly is achieved in the mode that the brackets of the upper column and the lower column are in lap joint, shear key grooves are interlocked, the shear connectors penetrate into the square holes, the beam bodies are supported on the combined brackets, and finally the U-shaped steel plates are used for anchoring. According to the joint, complete dry type operation is achieved, cast-in-place concrete and steel bar welding are not needed, the construction efficiency is remarkably improved, wet operation is reduced, loads can be borne after installation, the overall performance is reliable, and the development requirement of fabricated buildings is met.

A damping partition wall design method having variable friction energy dissipation, comprising the following steps: establishing an empty frame model which does not consider the lateral stiffness resistance of a partition wall, and calculating the inter-story shear force and inter-story displacement of a structure under the action of an earthquake; calculating the elastic strain energy of the structure, and determining an expected additional damping ratio provided by the damping partition wall for the structure; determining a friction damping force-sliding displacement curve of a single group of damping partition walls, and establishing a relational expression of total friction hysteresis energy dissipation and the friction damping force and target sliding displacement of the single group of damping partition walls; comparing a calculated additional damping ratio and the expected additional damping ratio to obtain the relationship thereof, and determining the friction damping force requirement of the single group of damping partition walls; designing elastic pieces; designing anti-shearing connecting pieces; and carrying out damage control verification. According to the damping partition wall having variable friction energy dissipation, parametric design and adjustment are carried out on the basis of the design goal of the structure, so that there are regulations to follow in the design of such a damping partition wall, and the anti-seismic toughness of the partition wall and structure can be synergistically improved.

To provide a method for removing a floor slab of a composite girder capable of reducing concrete remaining on the girder.SOLUTION: Since a cutting-in 5 extending in the bridge-axis direction is formed from the upper surface side of a floor slab at each arrangement location of a slippage preventing member 4 of a floor slab 3, and the floor slab 3 on which the cutting-in 5 is formed is pulled upward from main girders 2 and removed, the resistance force between the slippage preventing member 4 and the concrete of the floor slab 3 against the tensile load can be reduced by the cutting-in 5, and the floor slab 3 can be easily separated from the main girders 2. Thus, since it is not necessary to cut the floor slab 3 in the bridge axial direction such that concrete remains on the main girder 2 as in the related art, the floor slab 3 on the main girder 2 can be lifted and removed at once without being divided in the direction perpendicular to the bridge axis. As a result, the efficiency of the removal work can be improved, and there is an advantage that a large-scale concrete crushing work is not required.SELECTED DRAWING: Figure 5

The invention relates to the technical field of pressure monitoring, and discloses a method and system for motion state analysis according to plantar pressure, and the method comprises the steps: receiving multi-modal biomechanical data related to a landing event; extracting a corresponding motion feature vector from the multi-modal biomechanical data; and inputting the motion feature vector into a motion state analysis model for identification to obtain a corresponding damage risk index, and outputting the corresponding damage risk index. By receiving pressure distribution data detected by the plantar pressure sensing array, shear force data detected by the shear force measuring and calculating module and a kinematics data sequence detected by the inertial measurement unit, biomechanical information in the movement process can be comprehensively captured from multiple dimensions; compared with a single data acquisition mode, the fusion of the multi-modal data can reflect the real state of the human body in motion more accurately, and a richer and more accurate data basis is provided for subsequent motion state analysis.

The invention relates to a multifunctional test loading device for simulating bending shear torsion performance of a wind power tower, which comprises a counter-force column, a counter-force longitudinal beam, a counter-force cross beam and four actuators, and is characterized in that the counter-force cross beam is fixed at the top of the counter-force longitudinal beam through a bolt and is connected with a first actuator for axially applying pressure; the bottom of the tower drum is connected and fixed through a loading support with a kidney-shaped hole, and the end of the tower drum is connected with a loading beam through a conversion piece and abuts against a first actuator for axial pressure applying and loading. A fourth actuator on one side of the reaction wall is used for applying horizontal shearing force and torque; second and third actuators on the upper and lower sides of the counter-force longitudinal beam are used for applying bending moment; according to the device, loading of multiple load types can be achieved on the tower drum, the complex stress condition possibly borne by the tower drum in the actual use process can be simulated, and loading of any change of a single load of the tower drum can also be simulated; the device is suitable for loading and fixing tower barrels of different types and sizes; and the influence of torsional deformation and horizontal displacement on vertical load loading can be reduced through structural measures.

The embodiment of the utility model provides a roadbed slope reinforcing device which comprises a supporting frame used for providing support and provided with a plurality of mounting connectors, reinforcing ribs are arranged in the supporting frame to improve the lateral pressure resistance, inclined wing faces are arranged on the two sides of the supporting frame, and embedded locking pieces are further arranged to ensure stable structural connection; the anchor rod is connected with the supporting frame, goes deep into soil and is used for anchoring the whole device in a roadbed slope; the reinforcing panel covers the outer part of the supporting frame and aims to form a continuous plane; the shear keys are installed between the supporting frame and the reinforcing panel, and shear force is transmitted through a meshing structure; wherein the embedded locking piece comprises a telescopic locking pin which is used for adjusting the locking force; a spiral blade is arranged on the anchor rod; and an expansion screw is arranged at the tail end of the anchor rod. Through the scheme of the embodiment of the invention, the soil lateral pressure resistance of the device can be improved.

The invention relates to a shear key arrangement device and method for improving the crack resistance of a bridge deck in a hogging moment area of a steel-concrete combined continuous beam bridge, and belongs to the technical field of bridge engineering. Comprising a steel beam, a concrete bridge deck slab and stud shear keys arranged between the steel beam and the concrete bridge deck slab, and the rigidity of the shear keys can be adjusted according to needs so as to improve the stress performance of a concrete slab in a hogging moment area. According to the shear connectivity requirement, the total shear bearing capacity of the studs is calculated, the number of the studs is calculated according to the diameter of the selected stud type, the tensile stress of the concrete in the hogging moment area is calculated and compared with the designed allowable stress, and rigidity adjustment of the shear keys is achieved by changing the diameter and the number of the studs. And meanwhile, the total strength of the stud is kept unchanged. According to the scheme, the stress performance of the concrete slab in the hogging moment area of the steel-concrete combined continuous beam bridge can be effectively improved, meanwhile, the construction process is simplified, the safety is improved, the cost is reduced, the material performance is fully utilized, and the user experience is improved.

The invention provides a liquid film flow simulation method of a power law fluid, which is characterized in that nondimensionalization and simplification are carried out based on a control equation and a constitutive equation of liquid film flow of the power law fluid, and normal stress and shear stress balance conditions on the surface of the liquid film under the action of gravity and airflow shear force are deduced; and according to a liquid film surface boundary condition and a wall surface non-slip boundary condition, an expression of speed distribution in a power law fluid liquid film under the action of airflow shearing is provided. Deriving according to an integral boundary layer method to obtain a differential equation set of evolution of liquid film thickness and flow along with time and flow direction, wherein the differential equation set can be used for researching influence factors of liquid film flow characteristics of the power law fluid; time discretization is carried out by adopting a Runge-Kutta method, spatial discretization is carried out by adopting a finite difference scheme, so that the change rule of the liquid film thickness along with the time and the flowing direction is obtained, and the influence rule of the airflow shear force and the power exponent on the change of the liquid film thickness is discussed.

The invention relates to a wind power tower bending shear torsion test loading anti-interference decoupling switching integrated device, which comprises a reaction wall, a support, a reaction column, a reaction longitudinal beam, a reaction cross beam and four actuators, and is characterized in that the top end of a fixed tower on the support is connected with a loading beam through a switching device; the first actuator applies axial load to the tower drum through the loading beam and the switching device, the second actuator and the third actuator apply bending moment to the end of the tower drum through the loading beam and the switching device, the fourth actuator is matched with the connecting piece, the rectangular steel plate is connected with the switching device to apply horizontal shearing force and torque to the end of the tower drum, and application and decoupling of various types of loads are achieved. The test precision is ensured; the device can truly simulate the load condition of the tower drum section, can also be matched with the loading beam to transmit the axial force, the bending moment, the shearing force and the torque to the wind power tower drum, and effectively solves the influence of horizontal displacement and torsional deformation on loading in the horizontal and vertical load coupling loading process in the wind power tower drum composite load simulation test.

The invention discloses a prefabricated heat preservation groove type plate floor slab system of an assembly type steel structure trestle, and relates to the technical field of groove type prefabricated heat preservation floor slabs, the prefabricated heat preservation groove type plate floor slab system comprises an anti-skid face plate and a heat preservation bearing mechanism, the heat preservation bearing mechanism is arranged at the bottom of the anti-skid face plate, the heat preservation bearing mechanism comprises a plurality of sealing plates, and the sealing plates are arranged in the anti-skid face plate. The multiple sealing plates are arranged and located at the bottom of the anti-skid panel, multiple second supporting blocks are arranged at the bottoms of the sealing plates, groove-shaped plates are arranged on the outer sides of the multiple second supporting blocks, structural blocks are integrally formed through pouring and extruding, reinforcing strips are arranged on the inner walls of the structural blocks, and the structural blocks and annular hoops form a two-way constraint combined framework which can bear bending moment and shearing force; therefore, the bending resistance, the shearing resistance, the torsional rigidity and the overall bearing capacity of the plate body are improved on the premise that heat preservation is not affected on the whole, the engineering problems are avoided, and normal construction work and construction time are maintained.

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 present invention discloses a processing method for an emergency breakaway pin for an aircraft main landing gear. The pin is hollow and cylindrical, with two breakaway slots provided in the inner bore corresponding to two locations bearing shear force. A thickened section is provided between the two breakaway slots, and the inner bore diameter corresponding to the thickened section is smaller than that at other locations. The bottom of the breakaway slot is connected to the straight stepped surfaces on both sides by a rounded transition. The emergency breakaway pin of this solution has a breakaway slot design that not only controls precise breakaway but also limits the breakaway area. The rounded transition between the bottom of the breakaway slot and the straight stepped surfaces on both sides improves fatigue strength, and the thickened section between the two breakaway slots improves static strength. The measured breakaway value can be controlled within a range of ±4% of the set threshold, achieving precise breakaway.

A retention system is for a wear part for a bucket for an earth moving machine. The retention system has in operational use: i) a bucket body having a trench; ii) a force multiplier having a shape substantially corresponding to a shape of the trench; iii) a wear part mounted to an edge of the bucket body, and iv) a plurality of bolts. The wear part and the force multiplier is provided with at least one protrusion and another one of the wear part and the force multiplier is provided with at least one matching recess such that relative movement between the wear part and the force multiplier in a lateral direction parallel to the first mutual interface is prevented, in operational use, for reducing shear forces acting on the bolts.

The invention discloses a contact resistance-based method for synchronously measuring normal force and shear force of an interface, which comprises the following steps of: inspired by a yield criterion of material damage, establishing a relationship between normal stress and shear stress of the contact interface, thereby obtaining a relationship between a real contact area of the contact interface and the normal force and the shear force; obtaining the relationship between the contact resistance of the contact interface and the real contact area, and establishing the relationship between the contact resistance of the interface and the normal force and the shear force; according to the geometric deformation relation of the micro-convex bodies on the contact interface before and after the shearing force acts, the relation between the real contact area of the contact interface and the geometric deformation parameters of the micro-convex bodies is obtained, and the relation among the normal force of the contact interface, the shearing force and the geometric deformation parameters of the micro-convex bodies is obtained; and establishing a simultaneous equation set, measuring the contact resistance, and substituting the contact resistance into the equation set to calculate the normal force and the shear force. According to the invention, the normal force and shear force of the interface can be indirectly measured by measuring the contact resistance of the contact interface.

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 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 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 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 hybrid control method and device for a shear strength test of a rock mass structural plane, and relates to the technical field of physical property analys.The hybrid control method comprises the steps that the stress accumulation state before shear failure is simulated by controlling shear force to be increased or kept according to a preset function relation; judging whether a first condition for converting from the first mode to the second mode is met or not in real time, switching to the second mode when the first condition is met, controlling the position of the sample to remain unchanged, and simulating a stress release state during shear failure; judging whether a second condition for converting from the second mode to the third mode is met or not in real time; when a second condition is met, switching to a third mode, controlling the sample to slide at a constant rate, and simulating a stress retention state after shear failure; and when the accumulated slippage distance of the sample reaches a preset limit value, ending the test. According to the method, full-stage mechanical behaviors from the moment before damage to the moment after damage are reproduced, and accurate data support is provided for slope stability analysis and anti-sliding design.

The utility model relates to the technical field of composite shear walls, and particularly discloses an assembly type PEC recycled concrete beam column and steel plate composite shear wall which comprises a prefabricated column, a connecting plate is fixed to one side of the outer wall of the prefabricated column, a bearing plate is installed on one side of the connecting plate, and a prefabricated beam is fixed to the side, away from the connecting plate, of the bearing plate. A mounting hole is formed between the connecting plate and the bearing plate, and an assembling mechanism is arranged between the two precast beams; the splicing mechanism comprises a clamping groove, the clamping groove is formed in one side of the outer wall of the prefabricated beam, a sliding groove is formed in one side of the clamping groove, and the prefabricated shear plate can be located between the prefabricated beams through the prefabricated column, the connecting plate, the prefabricated beam, the bearing plate, the clamping groove, the sliding groove, the prefabricated shear plate and a sliding block in cooperation with a positioning groove, a positioning block and a material injection opening. And the situation that the labor intensity is increased while the assembling efficiency is low due to the fact that a plurality of bolts are used for fixed installation is avoided.

The utility model provides a novel rail vehicle overload and unbalanced load detection device with multiple detection areas, and relates to the technical field of vehicle overload and unbalanced load detection. Comprising a plurality of measuring areas arranged along a steel rail and a terminal, and sleepers are arranged at the bottom of the steel rail at intervals in the extending direction of the steel rail; connecting main beams are pre-buried in ballast beds on two sides of a steel rail in each secondary measurement area respectively, and the connecting main beams on two sides are fixedly connected with two ends of a first number of sleepers respectively; a first shearing force sensor and a second shearing force sensor are arranged at the position, corresponding to the upper portion of each connecting main beam, of the steel rail at intervals so as to detect shearing force data; the terminal is electrically connected with the first shearing force sensor and the second shearing force sensor so as to receive shearing force data, and whether the vehicle is overloaded or not is judged according to the shearing force data. The stability of the structure in the corresponding measuring area is improved, installation is convenient, and compared with the prior art, cost is lower.

The invention discloses a method for accurately predicting upheaval deformation of adjacent tunnels caused by foundation pit excavation by considering the influence of soil friction, which comprises the following steps of: firstly, determining size parameters of a foundation pit and an existing tunnel and physical and mechanical parameters of the tunnel and a soil body, and determining a stress mode of the tunnel and a model sketch of interaction of the foundation pit and the tunnel; determining the additional stress of the tunnel; then establishing a total energy formula of a tunnel upheaval deformation system of a Pasternak foundation model considering soil friction, 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, based on the Pasternak foundation model, the influence of axial soil body friction of the tunnel on tunnel deformation is considered, so that the calculated data better conform to the measured value. The method is simple and practical in matrix analysis, and has guiding significance for predicting the upheaval deformation of the adjacent tunnel caused by excavation of the foundation pit.

The present invention provides a stirring blade or the like that can efficiently apply shear force to fluids with a Reynolds number of 300 or higher. [Solution] The stirring blade 3 is a stirring blade 3 that stirs a fluid F by rotating around a rotating shaft 30, and generates a flow of fluid F with a Reynolds number of 300 or more, in which, in a region of 5% or more of the flow, the ratio of the deformation velocity tensor to the fluid velocity gradient tensor, which is the sum of the deformation velocity tensor and the rotation velocity tensor, is 0.8 or more. It comprises a plurality of plate-shaped members 311 to 314 that are rotatable at different positions in the radial direction perpendicular to the axial direction in which the rotating shaft 30 extends. It comprises two to five plate-shaped members 311 to 314 that are rotatable at two to five different radial positions.

The invention belongs to the technical field of coating production, and discloses a dispersion kettle for coating production, which comprises a kettle body, a tank cover is arranged at the top of the kettle body, and a stirring device is arranged at the top of the tank cover; the stirring device comprises a first motor, a rotating shaft, a first rotating rod, a driving assembly, a mounting disc, a connecting rod, a protective shell, a dispersing sheet, an adjusting assembly and a stirring assembly, and an output shaft of the first motor is fixedly connected with the rotating shaft. The angle of the dispersing piece and the size of shearing force can be adjusted through the driving assembly and the adjusting assembly, so that the dispersing piece can be adjusted according to the characteristics of different materials, material flowing can be controlled through the proper dispersing piece angle, dispersing dead angles are reduced, and exchange of upper and lower layers of materials is promoted; the materials can be uniformly and effectively dispersed in all positions in the kettle body, the quality problem caused by non-uniform dispersion is reduced, and the dispersion efficiency and effect are improved.

According to the straight and inclined pile combined railroad bridge pile group structure and the construction method thereof, three rows of piles are transversely arranged on a line, two rows of inclined piles are arranged on the two sides of the line respectively, the vertical inclination angle of the inclined piles ranges from 10 degrees to 30 degrees, the inclined piles lean against the direction of a bearing platform to improve the overall stability of the pile group, two rows of vertical piles are arranged in the middle, and the pile group structure is provided with two rows of piles in the longitudinal direction of the line. Three piles are arranged in each row, two inclined piles and one straight pile are arranged, and six piles, two vertical piles and four inclined piles are arranged in total; the pile top and the bearing platform are connected in a semi-rigid connection mode that the bent anchoring steel bars and the rubber layer are arranged around the pile top, and the deformation capacity and the ductility capacity of the joint are improved. Compared with a vertical pile group pile foundation, the straight-inclined combined pile group foundation can reduce shearing force and bending moment caused by the horizontal load effect, the horizontal bearing capacity is fully played, the horizontal displacement is reduced to a certain extent, meanwhile, a load transmission path can be optimized through the angle of the inclined piles, and therefore the shock resistance, integrity and stability of the whole structure are improved.

The invention discloses a cement thickness degree detection device, and belongs to the technical field of cement thickness degree detection, the cement thickness degree detection device comprises a cabinet body, a fixed screen seat is arranged on the top side in the cabinet body, and the bottom side in the fixed screen seat is connected with a sealing gasket. A detection worker manually operates a circular plate to drive two arc-shaped sliding blocks, a circular sleeve and an elastic conical cover to move downwards, in the up-down reciprocating motion process of the elastic conical cover, vibration is generated on the surface of the bottom of the elastic conical cover, adhered cement fine particles are effectively shaken off, sample residues are remarkably reduced, and therefore the accuracy of a detection result is guaranteed; in the downward moving process of a circular sleeve, a connecting shaft, a mounting sleeve and a plurality of spoilers are driven to synchronously and slowly rotate under the acting force of a guide rod and an arc-shaped groove, and ordered mild airflow shearing force is formed in the top area of the test screen through the slow rotating motion of the spoilers so as to assist and promote the fine powder penetration phenomenon of the test screen; and the screen analysis efficiency and uniformity of the device are improved.

The application relates to a compression-shear composite loading system based on a pulley system multi-point mean loading, and relates to a compression-shear composite loading system. In order to solve the problem that the traditional compression-shear composite loading is prone to uneven shear flow for a large-size composite stiffened wall plate structure, the application applies uniform compression loads to the side end surface loading end of a test piece through compression actuating cylinders and a flat pressing plate; two shear actuating cylinders output leftward shear loads along the upper end surface of the test piece; and the other two shear actuating cylinders output rightward shear loads along the lower end surface of the test piece; the loads are converted in direction through a pulley assembly and finally act on the shear plates on the upper and lower sides of the test piece. The application realizes the test under different compression-shear ratios by simultaneously adjusting the sizes of the compression and shear actuating cylinder forces, and optimizes the problem of uneven shear loading through the multi-point coordinated loading system, so that the shear of the measuring point is uniform, and the strength test of the large-size stiffened wall plate structure can be better satisfied.

The invention discloses a building component and a building structure, and relates to the technical field of buildings. Wherein a cavity is limited in the framework, and a plurality of communicating holes capable of communicating with the cavity are formed in the cavity wall of the framework; and the concrete body covers the periphery of the framework and is filled in the cavity. The excellent compression resistance of the concrete body can be used for bearing the load of a pressure area, meanwhile, restraining force can be generated on the framework, local yielding of the framework is prevented, the fireproof and anti-corrosion effects can be achieved, the framework can bear tensile force to make up for the tensile weakness of the concrete body, shear force can be borne, ductility is improved, and the service life of the concrete body is prolonged. And the bearing capacity and the stability of the building component are improved. Besides, the mechanical occlusal force between the framework and the concrete body can be increased through the communicating holes, interface slippage and cracking are effectively avoided, and the cooperative work capacity and durability of building components under long-term loads are guaranteed.

The application discloses a variable-angle shearing experiment device with controllable loading surface, which comprises a hydraulic press frame, a flexible transition plate arranged on the hydraulic press frame, a transition plate support base, a loading table and a lifting device, wherein the lifting device is arranged at the lower end of the hydraulic press frame and is used in cooperation with the loading table; the loading table is arranged on the upper side of the lifting device and is provided with a sample table on the loading table; the transition plate support base is arranged on the loading table and is used in cooperation with the flexible transition plate; the flexible transition plate is arranged on the loading table through the transition plate support base and is used in cooperation with a loading mechanism; the device has the characteristics of reasonable structure design, simple and convenient use and effective simulation of the real state of rock stress under complex environment, and can adjust the size of the pressure applied by the shearing force loading surface and the constraint surface, fix different size samples and adjust the curvature of the loading head.

The invention relates to the technical field of shear force testing, and discloses a sample piece auxiliary device for a shear test, which comprises a fixed frame with a hollow area, a first guide piece, a second guide piece, a first pressing plate, a second pressing plate, a second guide section and a third guide section, one end, deviating from the second guide section, of the first guide section is movably connected with an adjusting block, the first guide section is movably connected with a second pressing plate, the first pressing plate and the second pressing plate are driven to move in the axial direction, and the pressure sensor is pressed or released in the moving process. After pressure is loaded to the surface of the to-be-tested sample piece, the pressure sensor is not pressed any more and is convenient to take down, the testing process is simplified, operation is simpler and more convenient, and the preparation time before testing and the operation complexity in testing are reduced through quick release of the pressure sensor and real-time monitoring of the pressure value.