31 results about "Vertical shear" patented technology

The application provides an FRP / steel composite constraint UHPC anchor plate system and a use method thereof, and solves the problem that the anchor hole of the existing anchor plate is difficult to repair after deformation, and the anchor plate is made of a whole thick steel plate, so that the weight of the anchor plate is large, the cost is high, and the transportation and assembly are laborious. The application reduces the steel material proportion of the original anchor plate structure, replaces the steel material with a large amount of FRP material and UHPC material, saves the cost, and reduces the overall weight of the anchor plate structure. Meanwhile, the composite anchor plate is assembled by using a plurality of detachable accessories, the weight of each accessory is reduced, and the transportation and assembly are facilitated. The outer layer constraint is made of steel material with better vertical shear resistance, the problem of low shear strength caused by the weak strength of the FRP material in the vertical fiber direction is avoided, the structure is more scientific and reasonable, and the deformation resistance is better.

The utility model belongs to the technical field of bridge engineering, and particularly relates to a PBL shear key used on a segmental box girder. The PBL shear key structure is mounted at the joint of in-box web plates of two adjacent segments of box girders, and comprises a fixing plate of which the two sides are respectively connected with the in-box web plates of the two adjacent segments of box girders, and at least three positioning plates which are arranged on the fixing plate and are arranged along the splicing direction vertical to the segment box girders, and the connecting steel bars are perpendicular to the positioning plates and are used for connecting all the positioning plates. The structure at least comprises the fixing plates, the positioning plates and the connecting steel bars, so that the vertical shear stress at the splicing position of the segmental box girders can be quickly transmitted to the positioning plates through the fixing plates and dispersed, and the vertical shear resistance requirement of the splicing position of the segmental box girders is improved.

The invention discloses a pre-stressed anchor cable testing device which comprises a base, two ends of the upper side of the base are fixedly connected with gantries respectively, a beam plate is arranged between the two gantries, anchoring holes are formed in the bottom of the beam plate, simulated surrounding rock is arranged around the anchoring holes, baffles are arranged on two sides of the simulated surrounding rock, and sliding grooves are formed in the sides, close to the simulated surrounding rock, of the baffles. At least one sliding plate is slidably connected into the sliding groove, and a plurality of supporting rods are sequentially hinged to one side of the sliding plate. A reference shaft is arranged between every two adjacent supporting rods, the supporting rods are rotationally arranged on the reference shafts in a staggered mode, and limiting devices for limiting relative rotation of the supporting rods and the reference shafts are arranged in the reference shafts. Hooks are arranged at the lower ends of the sliding plates. The device has the advantages that free rotation is achieved through the multiple supporting rods and the reference shafts between the adjacent supporting rods, the larger the number of the supporting rods is, the smaller the interference to the simulated surrounding rock is, and the vertical shear test of the simulated surrounding rock is not affected.

The utility model discloses a connecting structure of a building added elevator steel structure box beam and an original building main body, which relates to the field of building structure engineering, and comprises a concrete beam, a steel plate is arranged on the side wall of the concrete beam, an oblong hole is formed in the inner wall of the concrete beam, equivalent screw rods are arranged on the inner wall of the concrete beam, and the equivalent screw rods are connected with the steel plate. A first nut is installed on the outer wall of the equivalent screw, an end plate is installed at the end of the box beam, a first connecting plate is installed on the outer wall of the end plate, a second connecting plate is installed on the outer wall of the steel plate, and a stainless steel bolt is installed on the inner wall of the second connecting plate. Through the arrangement of the concrete beam, the steel plate, the oblong holes, the equivalent screws and the first nuts, the flexural capacity of the concrete beam is reinforced while anchoring is met through the installed steel plate, then the concrete beam only bears vertical shearing force through the additional arrangement of the oblong holes, and generation of eccentric bending moment is effectively avoided.

The present application relates to a VTI medium shear wave anisotropy parameter estimation method based on seismic shear wave inversion. It includes obtaining seismic shear wave data and well logging data; determining shear wave anisotropy parameter well data according to the well logging data; determining VTI medium shear wave inversion initial model according to the seismic shear wave data and the shear wave anisotropy parameter well data; determining synthetic data according to the VTI medium shear wave reflection coefficient improved approximate equation; determining the objective function according to the seismic shear wave data, the synthetic data and the VTI medium shear wave inversion initial model; determining the VTI medium shear wave inversion result by using the objective function; and determining the VTI medium shear wave anisotropy parameter according to the VTI medium shear wave inversion result. The present application inverses the shear wave impedance and the horizontal shear wave velocity, and obtains the relationship between the shear wave impedance and the vertical shear wave velocity according to the well logging data, so as to estimate the shear wave anisotropy parameter, and effectively realize the seismic shear wave inversion for anisotropic medium.

This utility model relates to the field of optocoupler lead cutting technology, and in particular to an optocoupler de-adhesive cutting and lead-removing block. By setting a relief surface with a specific projection relationship at the bottom of the upper cavity, when the optocoupler is raised due to impurities, the inclined or arc-shaped structure of the relief surface changes the contact point between the lead pin and the lead-removing block from vertical shearing to progressive contact. The setting of the relief surface forms a physical relief space, which significantly reduces the stress concentration of the pins at the optocoupler package and greatly reduces the damage rate of the optocoupler pins. By adding a waste groove on the bottom surface of the lower cavity, metal debris generated by lead cutting can be actively collected, which to a certain extent eliminates the factor of the optocoupler being raised. Combined with the complete fit design between the bottom surface of the lower cavity and the optocoupler, it can also ensure the support capacity of the optocoupler and reduce the deformation of the optocoupler bracket during the lead cutting process. It solves the technical problem that the optocoupler pins may be cut off by the lead-removing block when the existing lead-removing block positions the components.

The invention provides a multifunctional geosynthetic material direct shear pull-out test device which comprises a test rack, the top of the test rack is fixedly provided with a shear box temperature control box used for placing an upper shear box and a lower shear box and controlling the internal temperature of a box body, and the shear box temperature control box is connected with a refrigeration control system; a workbench for mounting the upper and lower shear boxes is arranged at the bottom in the shear box temperature control box; a vertical loading device for providing vertical shearing force is arranged right above the shear box temperature control box, and a horizontal loading device for providing horizontal shearing force is arranged on one side of the shear box temperature control box; the horizontal loading device and the vertical loading device are fixedly connected through a reinforcing inclined rod; a conveying roller way is arranged on the opposite side of the horizontal loading device, and the tail end of the conveying roller way is in butt joint with the freezing and thawing cycle test box body. The device can be used for performing an interface friction test between a geosynthetic material and a soil body, a direct shear friction test and a drawing friction test are integrated into one device, and a shear box temperature control box and a cooling liquid temperature control box are arranged at the same time to jointly adjust the temperature of a sample.

The invention relates to the field of cable production, and discloses electric wire production adjustable cutting equipment which comprises a base. A pay-off assembly; a positioning assembly; a traction assembly; a reciprocating motion assembly and a cutting assembly. By installing the reciprocating motion and cutting assembly, the second motor is started to drive the rotating disc to rotate, the circular shaft eccentrically arranged on the front side of the rotating disc does circular motion along with the rotating disc, the circular shaft is sleeved with the limiting frame, and the rotating motion of the rotating disc can be converted into the reciprocating linear motion of the rotating disc; when the toothed part of the half gear is meshed with the rack, the rack is driven to move on the T-shaped plate in the horizontal direction, so that the cutting assembly can do reciprocating motion, and when the cutting assembly and the electric wire are synchronous in speed, the hydraulic rod acts immediately to push the two cutters which are arranged in a staggered mode to be rapidly combined to conduct vertical shearing; therefore, friction and lateral extrusion force between the cutting edge of the cutter and the surface of the electric wire are reduced.

Provided in the present application are a resonator, a chip and an electronic device. The present application relates to the technical field of resonators. The resonator comprises a substrate, a piezoelectric layer stacked on the substrate, and a plurality of interdigital electrodes, wherein the substrate and the piezoelectric layer are stacked, the plurality of interdigital electrodes are located on the side of the piezoelectric layer facing away from the substrate, and the plurality of interdigital electrodes are arranged side by side in a first direction, the first direction being parallel to the surface of the substrate. The substrate comprises a first material, and the first material has a first shear wave velocity V01, where V01=max(max{VSH,VSV}), VSH being the horizontal shear wave velocity of the first material in any direction, and VSV being the vertical shear wave velocity of the first material in any direction; the substrate has a shear wave velocity V1 in the first direction, where V1=max{VSH_x,VSV_x}, VSH_x being the horizontal shear wave velocity of the surface of the substrate in the first direction, and VSV_x being the vertical shear wave velocity of the surface of the substrate in the first direction; formula (I) is satisfied. Thus, leakage of shear bulk acoustic waves into the substrate can be effectively inhibited, thus optimizing device performance.

The invention relates to a splicing structure of adjacent new and old main beam diaphragm plates for widening a bridge and a splicing method thereof, in particular to the technical field of bridge construction. The steel-UHPC combined diaphragm plate comprises the early-formed steel-UHPC combined diaphragm plate and the middle later-stage UHPC poured into the early-formed steel-UHPC combined diaphragm plate, the high tensile capacity of the steel plates and the steel bars and the ultrahigh strength of the UHPC are fully played, and adjacent new and old main beams of an existing bridge and an extended new bridge are temporarily spliced into a whole through the diaphragm plate; the requirements for transverse tension and vertical shearing of the spliced transverse partition plate are met, meanwhile, weak vertical rigidity and transverse rigidity are temporarily formed, and large transverse bridge deformation and vertical warping generated by concrete shrinkage creep difference after splicing are coordinated; the structure is simple, the design is reasonable, construction is convenient, the splicing time is shortened, the method can be widely applied to splicing of adjacent new and old main beam diaphragm plates of an existing bridge and an extended new bridge in a broadening and extension project, and the construction efficiency is improved.

The utility model relates to the technical field of wire cutters, in particular to a power supply electric power line laying project wire cutter which comprises a base, a vertical rack is fixedly connected to the right side of the top end of the base, a transverse top plate is fixedly connected to the top end of the rack, and clamping mechanisms are arranged on the two sides of the top plate and the base. And the cutter is movably arranged under the bottom end of the top plate, and a shearing mechanism is arranged between the rack and the cutter. According to the utility model, the lead screw transmission mechanism is matched with the guide groove for use, so that the vertical shearing motion of the cutter along an accurate track is realized, the problem of cable extrusion deformation caused by lack of a dislocation angle during shearing of a traditional parallel blade is solved, and the flatness and the cutting effect of a shearing surface are ensured.

The utility model provides a kind of shearing type crushing device, including the crushing cylinder of upper end opening, the vertical shearing column is rotatably connected in crushing cylinder, the inner wall of crushing cylinder is gradually inclined to vertical shearing column direction downward, the inner wall of crushing cylinder is connected with multiple vertical fixed shear strips and is circumferentially distributed, blanking gap is left between every two fixed shear strips, the outside of vertical shearing column is connected with multiple movable shear strips corresponding to fixed shear strip one to one, the lower end of crushing cylinder is connected with support cylinder, installation cylinder is arranged in support cylinder, driving motor for driving vertical shearing column rotation is installed in installation cylinder, the bottom of crushing cylinder is opened with multiple blanking holes that are circumferentially distributed between the inner wall of crushing cylinder and the outer wall of vertical shearing column, support cylinder is outwardly communicated with the discharge channel that is communicated with blanking hole.The utility model uses brand-new structure design, can realize the demand of quick crushing, and is applicable to stone and other hard material processing.

The invention belongs to the technical field of seepage prevention and water stop of soil retaining and enclosure structures, and discloses a precast concrete sheet pile water stop structure which comprises grooves symmetrically formed in the splicing faces of the left side and the right side of a sheet pile, and a main connecting piece and an auxiliary connecting piece are fixedly installed in the two grooves in butt joint through bolts correspondingly. The two clamping grooves are symmetrically formed in the left side of the inner cavity of the auxiliary connecting piece front and back. Through the cooperative design of the main connecting piece, the auxiliary connecting piece and the limiting mechanism, the relative movement of the two connected sheet piles in the vertical direction after pile sinking can be restrained, the height of the sheet piles after pile sinking can be conveniently kept consistent, the overall supporting rigidity is improved, and the water permeability is reduced; the problems that in the prior art, relative movement of the two connected prefabricated concrete sheet piles in the vertical direction after pile sinking is inconvenient to restrain, shearing dislocation in the vertical direction is likely to be generated between the adjacent sheet piles, the sheet piles are inconvenient to keep consistent in height after pile sinking, the overall supporting rigidity is likely to be reduced, and the water permeability is high are solved.

The present application relates to the technical field of composite beam, in particular to a steel-concrete composite beam with embedded shear groove and a shear analysis method thereof.The present application comprises a concrete layer, the concrete layer is arranged with studs and steel bars in a matrix staggered manner, the studs are used for fixing the concrete layer with the lower steel beam, and the steel bars are used for fixing the concrete layer with the upper UHPC layer;the top surface of the concrete layer is embedded with a shear groove, which is used for enhancing the shear strength with the UHPC layer.The shear bearing capacity of the steel-concrete composite beam is analyzed from three dimensions, namely: taking the steel-concrete composite beam as the object, analyzing the vertical shear bearing capacity;taking the UHPC-concrete layer interface as the object, analyzing the longitudinal shear bearing capacity;taking the UHPC-concrete layer interface as the object, analyzing the interface longitudinal shear;comprehensively analyzing the results of the three dimensions, judging whether the theoretical shear bearing capacity of the designed steel-concrete composite beam meets the actual use requirements;respectively considering the contribution of each parameter to the shear bearing capacity, optimizing the design scheme.

The invention discloses a Bailey piece platform limiting structure for cast-in-place box girder construction and a construction method of the Bailey piece platform limiting structure, and particularly relates to the field of Bailey truss structures.The Bailey piece platform limiting structure comprises Bailey piece truss sets, an upper distribution beam and a lower supporting structure, and horizontal limiting pieces and vertical shear-resistant pieces are arranged between the Bailey piece truss sets; an adjustable limiting support is arranged between the bailey truss group and the upper part distribution beam; a base plate with a positioning groove is arranged between the beret piece truss set and the lower supporting structure, and the horizontal limiting pieces are H-shaped steel clamping plates, clamped between the adjacent beret piece vertical rods and fixed through high-strength bolts. Through the combined action of the horizontal limiting pieces and the vertical shear keys, the relative displacement between the beret pieces is effectively limited, and the overall rigidity of the platform is improved; the adjustable limiting support is convenient for adjusting the elevation of the platform, and meanwhile, reliable connection with an upper structure is ensured; the base plate positioning clamping groove realizes quick positioning and mounting, and the construction efficiency is improved; and all connecting pieces can be detached and reused, so that the construction cost is reduced.

The utility model discloses a sectional type cross -shear production line's shearing mechanism belongs to cross -shear production line processing technical field, this sectional type cross -shear production line's shearing mechanism, including rectangular mounting bracket, the both ends of rectangular mounting bracket inside are all provided with first vertical hydraulic cylinder, and the output of first vertical hydraulic cylinder is fixed with vertical lifting column, and the inside of vertical lifting column is provided with detachable vertical shearing cutter, the fixed mode of vertical shearing cutter has been optimized, and the replacement of vertical shearing cutter can be completed without disassembling multiple bolts, sets up rectangular scraper on the both sides of vertical shearing cutter, can scrape off the metal scrap, oil dirt and other impurities adhered on vertical shearing cutter in the shearing process automatically, avoids the influence of impurity accumulation to shearing accuracy, reduces vertical shearing cutter wear and tear simultaneously, prolongs the life, and through the operation of air -blower, improves the heat dissipation efficiency of vertical shearing cutter surface.

The invention provides a low-altitude jet stream identification method and system, electronic equipment and a storage medium. The method comprises the following steps: acquiring wind speed data of each air pressure layer; low-altitude torrent is classified according to boundary layer torrent and weather system related torrent, and the maximum wind speed and the minimum wind speed above the height where the maximum wind speed is located are recognized within the determined recognition height range of all kinds of torrent; the maximum wind speed and vertical shear determined by the maximum wind speed and the minimum wind speed above the height where the maximum wind speed is located serve as a first recognition index, boundary layer torrent and weather system related torrent are recognized, and torrent intensity grading is conducted; and the wind speed gradient of the maximum wind speed air pressure layer and the adjacent second air pressure layers above and below the maximum wind speed air pressure layer is extracted as a second identification index, the wind speed profile curvature of the maximum wind speed position is limited, and secondary identification is carried out on the boundary layer torrent and the weather system related torrent. According to the invention, the problem of missed identification of double torrent is solved, the characteristic condition of'narrow 'in a strong and narrow airflow zone is limited, and the identification result is more reliable.

The invention discloses a vertical shear stiffness quantitative identification and safety monitoring evaluation method for a new and old widened bridge joint, and belongs to the field of bridge engineering safety detection and structural performance monitoring. The invention relates to a method for identifying the rigidity of an abutted seam of a widened bridge, which is characterized in that under the excitation of a low-speed vehicle load, the ratio of response time cumulants of quasi-static displacement generated in the midspan of a new bridge and an old bridge and the vertical rigidity of the abutted seam connecting the two have a clear and stable mathematical mapping relationship; and a stable and reliable dimensionless identification index which is directly associated with the abutted seam rigidity is constructed, so that quantitative evaluation of the health state of the abutted seam is realized. The invention discloses a new and old widened bridge joint safety assessment method. The method comprises the following steps: step 1, arranging a new and old widened bridge joint structure performance monitoring system; 2, deploying a signal processing module and a parameter calculation and state evaluation module in a background; and step 3, deploying a display and monitoring early warning module on a client, wherein a manager can see the content of the display and monitoring early warning module.

The utility model relates to the technical field of textile machinery, and discloses a novel scissors system for a water jet loom, which comprises a fixed cylinder for supporting, a transmission shaft for driving is rotatably connected in the fixed cylinder, two ends of the transmission shaft extend to the outside of the fixed cylinder, and a swing piece is fixedly connected to one side of the outside of the transmission shaft. The upper shear blade is driven to move vertically to form vertical shear force with the lower shear blade, so that the problems of material extrusion deformation and cutting edge lateral abrasion caused by traditional oblique shearing are effectively solved, the shearing efficiency of high-strength materials such as chinlon and single-strand thick filaments and coarse and hard fabrics such as screen windows is remarkably improved, and the shearing efficiency is improved. And meanwhile, the phenomena of tipping and curling are reduced, fiber chippings and dust generated by cutting can be synchronously adsorbed, impurities are prevented from being accumulated to form a grinding medium, the cracking risk caused by abnormal abrasion of a cutting edge and embedding of hard chippings is avoided, and the service life of a scissor system is further prolonged.

This invention proposes a single-shear apparatus and shearing method for uniform shear strain distribution. The shearing method includes installing a shearing assembly, loading the sample into the stack of plates of the shearing assembly, installing a vertical loading device and a shear force loading device, applying a vertical load to the sample to consolidate the sample, installing a left-side sliding limit device, and applying a horizontal load to the consolidated sample for shearing. This invention can precisely control the shearing direction, solve the problem of shear force direction deflection in the prior art, and enable uniform shearing of the sample, ensuring uniform vertical shear strain distribution.

The invention discloses a large-scale in-situ vertical shearing device of a vertical contact surface and a test method of the large-scale in-situ vertical shearing device. The device comprises an I-shaped steel counterforce module anchored on a structural wall through an expansion bolt, a sample box module for placing a soil sample, a horizontal hydraulic loading module capable of moving along a counterforce module slide rail, and a vertical hydraulic loading module for providing a shearing force, the gravity balance module is used for balancing the self weight of the horizontal module; and the servo control system is integrally controlled. The method comprises the steps of field installation and anchoring, sample preparation, module installation, counterweight calculation and configuration, graded loading, data correction and analysis and the like. The device effectively solves the problems of counterforce supply and gravity interference elimination in the vertical contact surface in-situ shear test, the modular design is convenient for field installation and disassembly, the test result precision is high, and a reliable technical means is provided for accurately evaluating the shear strength characteristic of the vertical structure and the soil body contact surface.

The utility model discloses a landslide mass reinforcing structure which comprises a plurality of exploring holes extending from a landslide mass to a slide bed, the tail ends of the exploring holes are located in the slide bed, shear-resistant holes are formed in the positions, opposite to slide surfaces, in the exploring holes, and the shear-resistant holes comprise vertical shear-resistant holes penetrating through the slide surfaces and lateral shear-resistant holes formed in the lateral direction of the slide surfaces. Drainage holes are formed in the exploration hole and located on the two sides of the shear-resistant hole, and the bottoms of the drainage holes are lined with concrete. The utility model solves the problems of insufficient shear capacity and limited drainage effect in the treatment of landslide mass in the prior art.

The utility model relates to the technical field of spliced fireproof groove type bridges, in particular to a high-stability spliced fireproof groove type bridge, which comprises a top cover mounted at the top of a bridge body, and a splicing mechanism for improving splicing stability is arranged on the bridge body. According to the utility model, the tenon and the tenon shoulder are inserted into the mortise and the tenon nest, so that the splicing of two bridge frames is quickly completed, and the tenon shoulder assists the tenon in bearing a part of pressure, so that the tenon and the tenon are matched to bear larger weight, and the overall bearing capacity is improved; the contact area of the splicing position of the two bridge frames is increased, the two bridge frames are connected more tightly, twisting between the two bridge frames is effectively limited, lateral stability is improved, vertical shearing force can be dispersed to the T-shaped sliding grooves matched with the T-shaped sliding blocks through the arrangement of the T-shaped sliding blocks, and through tight contact and interaction force between the T-shaped sliding blocks and the T-shaped sliding grooves, the stability of the bridge frames is improved. And the connection stability is further improved.

The application discloses a shock-absorbing sound-insulating heat-insulating fabricated building structure, which comprises a first supporting column and a second supporting column, the first supporting column is a rigid column body, and the second supporting column is a flexible column body; a beam plate is arranged between the first supporting column and the second supporting column in the vertical direction, one side of the beam plate is hingedly connected with the first supporting column, and the other side of the beam plate is rigidly connected with the second supporting column. The fabricated building structure adopts a rigid-flexible combined mode to realize vibration isolation and energy dissipation of the structure, and structural strength and stability of the building structure are ensured. A vertical shear-resistant component is arranged in a large frame, a rigid beam plate is arranged in the transverse direction, and a flexible isolation support is arranged in a local region; one side of the beam plate is rigid and the other side is hinged, one side is fixed and the other side is hinged, the beam plate not only bears horizontal stress, but also resists the problem of excessive strain caused by different deformations.

The invention relates to the technical field of rock friction experiments, in particular to a rock friction sliding instability simulation test system and device which comprises a loading module, a sample preparation module, a rigidity adjusting module, a multi-parameter sensing module and an instability judgment module. The loading module applies normal stress in a pneumatic pressurization mode and applies vertical shear load through servo control equipment; the sample preparation module is used for clamping and centering a rock sample; the rigidity adjusting module adjusts the equivalent rigidity by replacing a disc spring group; the multi-parameter sensing module synchronously collects multi-physical field signals; the instability judgment module determines a relative stability parameter of the rock according to the acoustic emission event so as to judge an instability type, and determines an instability judgment mode of the rock sample; according to the method, dominant and implicit types of rock instability are accurately distinguished, the instability occurrence time is predicted in advance, and the accuracy and reliability of early warning are effectively improved through the refined instability judgment method.

The embodiment of the invention discloses a method for determining the normal section bending moment of a steel-concrete hybrid wind power lattice type tower transfer structure under the bending working condition. The method comprises the steps that the geometric size of the transfer structure, the size of a flange plate, the preset downward axial force and the preset total bending moment are obtained; the transfer structure of any arc angle in the transfer structures is taken as an isolation body for stress analysis to obtain the stress condition, the stress condition comprises vertical shearing force acting on the normal section centroid of the isolation body, and the horizontal plane where the acting point of the vertical shearing force is located and the axis of the isolation body intersect at an intersection point O; determining the moments of all loads to the intersection point O in the isolator based on the stress condition, the flange plate size, the total bending moment, the geometric size and the axial force; and then obtaining a corresponding normal section bending moment through a pre-established normal section bending moment formula. According to the method, the blank of an existing design specification is filled, the reliability of a calculation result is ensured, a scientific basis is provided for optimization design and safety evaluation of the switching structure, and the engineering risk is reduced.

The invention provides a resonator, a chip and electronic equipment. Relates to the technical field of resonators. The resonator comprises a substrate, a piezoelectric layer and a plurality of interdigital electrodes, the piezoelectric layer and the interdigital electrodes are stacked on the substrate, the substrate and the piezoelectric layer are stacked, the interdigital electrodes are located on the side, away from the substrate, of the piezoelectric layer, the interdigital electrodes are arranged side by side in the first direction, and the first direction is parallel to the surface of the substrate; the substrate comprises a first material, the first material has a first shear wave sound velocity V01, V01 = max (max {VSH, VSV}), VSH is a horizontal shear wave sound velocity of the first material in any direction, and VSV is a vertical shear wave sound velocity of the first material in any direction; the substrate has a shear wave sound velocity V1 in the first direction, V1 = max {VSHx, VSVx}, VSHx is a horizontal shear wave sound velocity of the surface of the substrate in the first direction, and VSVx is a vertical shear wave sound velocity of the surface of the substrate in the first direction; in this way, shear bulk acoustic waves can be effectively prevented from leaking into the substrate, and the performance of the device is optimized.

The invention discloses a fan blade foam core material shear key design method, which comprises the following steps of: firstly, establishing a finite element simulation model to facilitate simulation of a subsequent shear strength test, performing shallow slot design between deep slots on the basis of the existing deep slot design, and designing a shear key between the deep slots on the basis of the existing deep slot design. The size, the shape and the set angle of the shallow slot can be set at will, and the design of the shallow slot transverse shear key can enhance the shear strength according to simulation data; by designing the positions of the through holes, the positions of part of the through holes coincide with the deep grooves, so that the vertical shear key is designed, the size, the shape and the inclination angle of the through holes can be set at will, and it can be obtained through simulation data that the mode that part of the through holes coincide with the deep grooves is designed, and the shear strength can be enhanced; the method can effectively improve the shear strength of the foam core material, and is suitable for structural design of the foam core material in the fan blade.

This invention discloses a method for determining the normal section bending moment of a steel-concrete hybrid wind turbine lattice tower transition structure under axial compression. The method involves obtaining the geometric dimensions of the transition structure and a preset downward axial force; taking any arc angle of the transition structure as an isolator for stress analysis to obtain the stress conditions, including: a vertical shear force acting on the centroid of the normal section of the isolator, with the horizontal plane of the shear force's application point intersecting the axis of the isolator at intersection point O; determining the moments of all loads in the isolator about intersection point O based on the stress conditions, geometric dimensions, and axial force; and obtaining the corresponding normal section bending moment using a pre-established formula based on the moments of all loads about intersection point O. This invention not only fills a gap in existing design specifications and ensures the reliability of the calculation results through theoretical derivation and finite element verification, but also provides a scientific basis for the optimized design and safety assessment of transition structures, reducing engineering risks.

The invention relates to the technical field of building construction, and discloses a construction method of a large-story-height building aluminum alloy formwork. Comprising the following steps of S1, surveying and setting out, S2, wall column formwork installation, S3, wall column formwork reinforcement, S4, beam formwork installation, S5, floor formwork installation, S6, transverse rod tying, S7, vertical rod leveling and straightening and S8, concrete pouring. A composite reinforcing system of opposite-pull screws, square tube back ridges, adjustable diagonal draw bars, transverse steel pipes, horizontal diagonal bracings and vertical diagonal bracings is designed for wall column formworks, the back ridge setting height, the pull rod distance and the angle parameters of different parts are defined, and particularly differential back ridge arrangement is adopted for column, shear walls, beams and floor formworks. Especially, the bidirectional diagonal bridging is added on the transverse steel pipes tied by the transverse rods, so that the overall rigidity and the lateral displacement resistance of the formwork are remarkably improved, and the problems of slurry leakage, formwork deformation and the like are effectively reduced. Meanwhile, vertical rods of upper and lower floors are required to be on the same vertical line, and high-rise building construction requirements are met.