1531 results about "Shear resistance" patented technology

The invention discloses a shear capacity analysis method for a reinforced concrete beam with stirrups based on machine learning, and the method comprises the steps: constructing a training set and a test set based on a shear capacity database of the beam with stirrups; establishing an interpretable prediction model by utilizing machine learning, setting hyper-parameters for the interpretable prediction model, and performing training; obtaining a shear bearing capacity prediction value of the samples in the test set by using the trained prediction model; and quantifying the contribution of each key anti-shearing characteristic to the anti-shearing bearing capacity predicted value, and analyzing and judging the reasonability of the anti-shearing bearing capacity predicted value output by the prediction model according to the anti-shearing theory. According to the method, the problems of high prediction difficulty, high discreteness, lack of reliable physical models, large calculation amount of high-precision numerical simulation and the like in machine learning are solved for the first time; the prediction model can accurately reflect the complex nonlinear relation between the shear bearing capacity and the influence factors, and meanwhile, the model reasonability is verified and improved in combination with a prediction result and priori knowledge, so that the man-machine interaction trust in practical application is improved.

The invention relates to the technical field of building structures, in particular to a method for calculating node shear bearing capacity of a composite beam, which comprises the following steps of: decomposing the shear bearing capacity of a node core area into shear contribution components of a square steel tube web, encased concrete and a steel wire mesh, and respectively calculating the shear bearing capacity based on respective structural characteristics and stress mechanisms; the total shear bearing capacity is obtained through superposition; and each component is quantized by introducing correction coefficients of an axial compression ratio and a beam-column linear stiffness ratio. According to the method, the technical blank of shear resistance calculation of the concrete joint in the core-free area is filled, the error is controlled within + / -15%, and the method has the characteristic of high precision, is suitable for design of the composite beam joint filled with the concrete in the core-free area in a high-rise building and an underground structure, is high in engineering applicability and provides a reliable calculation basis for design of related building structures.

The invention discloses a positive screw pile foundation axial ultimate uplift bearing capacity calculation method. The method comprises the steps that a pile-soil interface contact normal pressure stress function and a contact tangential friction stress function are constructed; constructing an equivalent relationship between the uplift resistance on the right-hand screw pile drawing surface and the shear resistance on the cylindrical shear failure surface of the foundation soil body, and obtaining the horizontal force and the circumferential torque of the soil body acting on the right-hand screw pile drawing surface; obtaining an equivalent concentrated load of a horizontal force and an action point location thereof; the radial load of the foundation soil body acting on the right-hand screw pile drawing face is obtained, and the additional radial stress on the cylindrical shear failure face in the foundation soil body is obtained; obtaining application conditions of an additional shear resistance calculation formula according to an additional radial stress limit summation calculation formula; and a positive screw pile foundation axial ultimate uplift bearing capacity calculation formula is constructed, and the positive screw pile foundation axial ultimate uplift bearing capacity calculation formula is obtained. The problem that the axial ultimate uplift bearing capacity of the positive screw pile foundation cannot be accurately obtained through an existing method is solved.

The disclosure discloses a method for strengthening shear strength of a RC beam with a compressed steel bar, including step one: analyzing and concluding that the compressed steel bar has a positive effect of on shear strength of the RC beam via experimental testing and / or establishing a truss model; step two: carrying out a finite element simulation; step three: comparing a result obtained by the finite element simulation with that obtained by the experimental testing, to verify a reliability of the finite element model; step four: systematically researching a comprehensive impact of a reinforcement ratio of the compression steel bar, a stirrup ratio ρsv, a reinforcement ratio ρst of a tensile longitudinal steel bar, a shear span ratio / and a concrete strength grade (fco) on the shear strength of beam; and step five: obtaining a mathematical model of an increment of shear strength via regression analysis.

The invention relates to an offshore floating type wind power steel shell concrete composite structure platform and a construction method, the platform comprises a steel shell, and the steel shell comprises an outer side steel shell and an inner side steel shell which are arranged at an interval; the inner concrete filling layer is filled between the outer side steel shell and the inner side steel shell; the connecting structure is arranged at the joint of the steel shell and the internal concrete filling layer and used for enhancing the connecting rigidity and stability of the steel shell and the concrete; the connecting structure comprises transverse reinforcing rib plates, longitudinal reinforcing rib plates, partition plates and anti-shear studs, the transverse reinforcing rib plates and the longitudinal reinforcing rib plates are arranged in a grid shape, the space between the outer side steel shell and the inner side steel shell is divided into a plurality of areas through the partition plates, and the anti-shear studs are used for enhancing the anti-shear capacity between the steel shells and concrete. Through innovative connection structure design, a steel structure is combined with concrete, efficient and intelligent hole design is combined with an advanced sensing technology, automatic control and intelligent monitoring, the construction quality of the structure is guaranteed, and an efficient and low-maintenance structural form is provided.

The invention belongs to the technical field of gate shaft construction, and particularly relates to a one-time forming pouring system and a one-time forming pouring method. The gate groove formwork and the vertical shaft sliding formwork assembly in the one-time forming pouring system can move in the depth direction of the gate shaft and jointly define a pouring ring, and when the strength of hydraulic concrete structures corresponding to the vertical shaft sliding formwork assembly and the gate groove formwork reaches the demolding strength, the gate groove formwork and the vertical shaft sliding formwork assembly are separated. The positions of the vertical shaft sliding formwork assembly and the gate groove formwork can be adjusted through the lifting device and the hoisting device, so that the pouring space rises in the depth direction of the gate shaft, continuous pouring of the hydraulic concrete structure is met, pouring of the hydraulic concrete structure does not need to be conducted step by step, joints are avoided, and the construction efficiency is improved. The integrity and shear strength of the hydraulic concrete structure are improved, so that the construction quality of the hydraulic concrete structure in the gate shaft is ensured, and meanwhile, the construction difficulty is reduced.

The invention relates to the technical field of geotechnical engineering testing, in particular to a gravity type multifunctional in-situ testing device and a gravity type multifunctional in-situ testing method, and the testing device consists of three parts, namely a penetration system, a shearing system and a power system. The penetration system comprises a spindle-shaped full-flow penetration probe and a motion sensor. The shearing system comprises two arc-shaped shearing plates, a power shaft and a torque sensor. The power system comprises a moving empennage, a motor, a storage battery and an information collector. The device is hoisted to a test point to be thrown, so that the device freely falls and can penetrate into a soft soil layer, motion parameters of the device in the process of penetrating into the soft soil are tested and recorded, and the characteristics of the soil layer are obtained; and the arc-shaped shear plate is opened and rotated, so that the undrained shear strength of the soft soil layer is obtained. The test platform is convenient to arrange and high in test efficiency and accuracy. Excessive manpower is not needed, and the automation degree is high. Therefore, the technical problems that a test platform of an existing in-situ test device is difficult to arrange and low in automation degree can be solved.

The invention provides an epoxy resin binder and a preparation method and application thereof, and relates to the technical field of steel bridge deck pavement, the epoxy resin binder comprises the following components: a main agent and a curing agent; the main agent comprises the following components: bisphenol A epoxy resin, a reactive diluent, a non-reactive diluent, a nano rubber toughening agent, a liquid rubber toughening agent and an optional first antioxidant; the curing agent comprises the following components: an amine curing agent, a phenol curing agent, a coupling agent and an optional second antioxidant. The epoxy resin adhesive is a high-temperature anti-shearing type epoxy resin adhesive, has good high-temperature stability when being used for steel bridge deck pavement, still keeps relatively high tensile strength and shear strength with a steel plate, a wearing layer and a protective layer at high temperature, and balances the relationship with indexes such as tensile strength, ductility and construction holding time; and the possibility of shear failure of the steel bridge deck pavement at high temperature can be reduced.

The invention provides a system and method for testing the shear resistance of an anchoring structural plane under water-force coupling, and the system comprises a prestress loading device which provides a prestress for an anchoring body sample, so that the structural plane is provided with a water flow channel with controllable opening degree; the shearing device is used for applying shearing force to the anchoring body sample to enable the structural surface to slide so as to damage the mortar protective layer; the high-pressure corrosion device is used for providing an osmotic pressure environment for the anchoring body sample so that a corrosion solution permeates into the structural surface to corrode the anchor cable, and the data acquisition device is used for monitoring sliding displacement, shearing force, pulling force, water pressure and ion concentration of the structural surface; the anchor cable corrosion damage coefficient calculation device is used for obtaining an anchor cable corrosion damage coefficient in the anchoring structure surface; the residual shear strength calculating device is used for obtaining the residual shear strength of the anchored structural surface after corrosion; and the anchoring body safety evaluation device is used for evaluating the safety state of the anchoring body. The method solves the problem of testing the residual shear strength of the anchoring structural surface considering the corrosion damage of the anchor cable under the synergistic effect of multiple factors.

The invention discloses a beam-column joint reinforced through FRP pipes, and belongs to the technical field of construction building structures, the beam-column joint comprises a joint formwork for bearing concrete, a plurality of steel bars are arranged in the joint formwork and are distributed in a horizontally and vertically staggered mode, the FRP pipes are vertically arranged at the joint positions in the joint formwork, a plurality of through holes are formed in the side faces of the FRP pipes in a penetrating mode, and the FRP pipes are connected with the joint formwork. The reinforcing steel bars penetrate through the penetrating holes, the FRP pipe is arranged in the middle of the beam-column joint, the FRP pipe provides 45-degree shear resistance and annular constraint for the beam-column joint through the tubular structure, the bending resistance of the beam-column joint in the vibration environment is improved, the FRP pipe is arranged to replace the vertical limit reinforcing steel bars, the number of the reinforcing steel bars is reduced, and the construction efficiency is improved.

Disclosed in the present application is a cast-in-place prefabricated building formwork component suitable for columns or beams, comprising a columnar formwork and stirrups fixed to the formwork; the upper and lower ends of the formwork are provided with connection fitting parts that fit adjacent formworks; the formwork is defined by steel plates; the stirrups are jointly formed by the steel plates and rod-shaped members fixedly connected to inner side surfaces of the steel plates. In addition, further disclosed in the present application are a cast-in-place prefabricated building shear wall component and a cast-in-place prefabricated building floor slab component. A stress test result proves that structures such as columns and beams formed by the cast-in-place prefabricated building formwork component in the present application can have a better constraint effect on concrete cast inside, and particularly increase a constraint area, thereby improving the overall shear resistance and bearing capacity of buildings, and having great significance for seismic resistance of the buildings in earthquakes.

The invention relates to the technical field of consolidation structures, in particular to a tower beam pier consolidation structure of a swivel cable-stayed bridge, a tower beam pier consolidation area comprises a partition plate, a stiffening plate, a shear nail, a prestress pull rod set and consolidation concrete, the tower beam pier consolidation area is consolidated with a cable bent tower, a pier and a main beam at the same time, the cable bent tower penetrates through the main beam from top to bottom, and the pier penetrates through the main beam. Concrete in the tower beam pier consolidation area, tower column concrete of the cable bent tower and bridge pier concrete are poured into a whole together, it is guaranteed that steel and concrete in the tower beam pier consolidation area are stressed and deformed together, and the problems that a traditional tower beam pier consolidation structure is weak in bonding performance and insufficient in torsional shear resistance are solved.

The invention relates to the field of fabricated buildings, in particular to a fabricated building frame structure beam-column joint structure and an implementation method, and the beam-column joint structure comprises a reinforced concrete prefabricated column and a reinforced concrete prefabricated beam. A column cap is arranged on the top of the lower-layer column, a prefabricated column reserved anchoring longitudinal bar on the column penetrates through the column cap and is connected with an upper-layer column longitudinal bar anchoring hole, and a grouting hole and an exhaust hole are formed in the side face of the upper-layer column. One end of the precast beam is lapped on the column cap, a horizontal anchoring rib is reserved on the lower portion of the beam and extends to the joint, a precast beam stirrup is exposed out of the top, secondary cast-in-place concrete is laid on the top, a formwork is connected to the side face, a reserved groove is formed in the joint side, and a bed mortar layer is arranged at the bottom of the upper-layer column. According to the structure, the bearing and shearing resistance of beam-column joints is enhanced, and the stability and shock resistance of the frame are improved; prefabricated parts are produced in factories, efficiently assembled on site, matched with standard construction procedures, shortened in construction period and matched with industrial production, development of fabricated buildings is effectively promoted, and the problems of node connection and construction efficiency of existing fabricated structures are solved.

The utility model relates to the technical field of steel structure shear resistance, in particular to a novel steel structure shear key which comprises a high-strength bolt and a sleeve which are sleeved together, the top of the sleeve is inserted into a pre-embedded plate of a steel column foot or a support, and the top of the sleeve is in threaded connection with the pre-embedded plate and then is welded and reinforced under the plate in a surrounding mode. The sleeve is embedded into a foundation and fixedly connected with the foundation, and the high-strength bolt is screwed into the sleeve through the top of the sleeve and fixedly connected with an upper layer component through a nut. The high-strength bolt and the sleeve which are sleeved with each other are adopted to replace existing H-shaped steel and square steel, only a small installation gap is needed, steel bars at the joint are easy to process, the influence on anchoring connection of concrete and the steel bars at the connecting position can be reduced to the maximum extent, the embedded part is machined in a factory, and the construction cost is reduced. And the connection precision and quality are guaranteed, only high-strength bolts need to be screwed in and screwed to the installation torque on site, and the effect is good through practice inspection.

The invention relates to a construction method and construction equipment for a high-pressure jet grouting pedestal pile. The construction method comprises the steps that S1, the equipment enters a site; s2, taking a fixed pile cylinder, and pressing the fixed pile cylinder to a bearing stratum at a pile position; s3, the soil body in the hollow part of the fixed pile cylinder is taken out; s4, jet grouting cutting or expanding cutting is carried out in the undisturbed soil body at the bottom of the fixed pile cylinder to form an expanded pit; s5, molded concrete is fed into the expanded pit in a pressed mode, the molded concrete is limited to upwelling in the hollow part of the fixed pile barrel, and cemented soil in the expanded pit is extruded into the undisturbed soil body on the peripheral side of the expanded pit and the gap between the fixed pile barrel and the pile hole; an expanding body, a lower surrounding body, a reinforcing body and an upper surrounding body are respectively formed; and S6, concrete is poured into the hollow part of the fixed pile cylinder to form a pile body. During construction, surrounding soil is basically not disturbed, noise is low, the pile can be exploded, the upper surrounding body and the lower surrounding body which are integrally solidified and formed wrap and protect the joint part between the pile body and the expansion body, and the anti-shearing capacity of the joint part of the pile body and the expansion body can be greatly improved.

The utility model discloses a fire-fighting wire with high shear resistance, and belongs to the technical field of fire-fighting cables. The fire-fighting electric wire with the high shear resistance comprises an inner core layer, the inner core layer is composed of a battery cell and an inner mica layer, the outer portion of the inner core layer is connected with a functional layer in a wrapping mode, the functional layer comprises an isolation layer, the outer side of the isolation layer is connected with an outer mica layer in a wrapping mode, the outer side of the functional layer is connected with a shear resistance layer in a wrapping mode, and the shear resistance layer comprises an annular wire hoop. The outer side of the wire is provided with a wire hoop, the outer side of the wire hoop is provided with anti-shearing metal wires in a circumferential array mode, the anti-shearing metal wires and the wire hoop are connected in a hot melting mode, the anti-shearing layer is connected with an outer layer in a wrapping mode, the outer layer comprises a rubber layer, and the anti-shearing layer is located in the rubber layer. And the inner mica layer and the outer mica layer are utilized, so that heat insulation protection can be conveniently carried out on the internal battery core, and the fire resistance during use is improved.

The invention relates to the technical field of material detection, in particular to a solid wood furniture material detection method and system.The method comprises the following steps that form data of a furniture bearing component under the shearing-bending loading condition is obtained, wood connection node imaging is collected, crack displacement is calculated according to a loading sequence, and a fiber bonding point load value is extracted; and calculating the furniture crack growth rate. According to the method, form data is collected through shear-bending loading, crack displacement and fiber bonding point load calculation is achieved, the crack propagation rate is more accurate, the pixel displacement gradient and the maximum shear stress gradient area are combined, the stress concentration point recognition precision is improved, the crack path is tracked based on the local shear stress gradient, and the interlayer energy consumption rate is calculated. Extracting a critical state, identifying a crack instability point, improving damage evolution prediction precision, and improving bending resistance and shearing resistance evaluation comprehensiveness and quality detection reliability in combination with multi-layer stress change and gradient calculation.

The present application provides a split bolt, which relates to the field of building technology. The split bolt comprises: a base and a plurality of split parts, the split parts comprising a first part and a second part, one end of the first part is connected to the second part, the other end of the first part is connected to the base, the first parts of the plurality of split parts and the base constitute a bolt rod, the second parts of the plurality of split parts constitute a bolt cap, and there is a gap between adjacent split parts, and the gap is filled with an elastic partition material. The split bolt greatly improves the shear strength of the bolt by increasing the diameter of the base, meeting the shear force requirements between steel and high-strength or ultra-high performance concrete. The upper split part is used to meet the requirement that "the length of the weld of the cylindrical head welded nail connector should not be less than 4 times its rod diameter", and maintain good ductility. It has the advantages of avoiding the group nail effect, convenient construction, reducing the number and height of the bolts, and increasing the shear bearing capacity without reducing the ductility.

The utility model discloses an anti-shearing type high-sealing-performance flange connecting structure which is composed of a blind plate, a sealing ring, a first sealing gasket, a second sealing gasket and a flange. The spline and the spline groove which correspond to each other are distributed on the connecting face of the blind plate and the flange, and the blind plate and the flange have high shear resistance during torsion through embedding of the spline and the spline groove. Meanwhile, a first sealing gasket and a second sealing gasket which are matched with the blind plate spline groove and the flange spline groove are arranged, the first sealing gasket and the second sealing gasket are padded into the corresponding spline grooves, and after the blind plate and the flange are embedded, the connecting face of the blind plate and the flange has sealing performance. Thirdly, blind plate sealing teeth and a blind plate sealing groove are arranged on the blind plate, a sealing ring is sleeved with the blind plate sealing groove, flange sealing teeth are arranged on the flange, and after the blind plate and the flange are embedded, the flange sealing teeth press the sealing ring and are annularly embedded with the blind plate sealing teeth, so that the blind plate and the inner side wall of the flange have vertical sealing performance.

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 discloses a novel flexible ecological drainage ditch structure and a construction method thereof, belongs to the technical field of drainage ditch construction, and solves the problems of serious deformation and cracking of a traditional concrete drainage ditch. The structure specifically comprises an anti-corrosion layer, a drainage layer and an anti-seepage layer. The seepage prevention layer is arranged at the bottom of the drainage ditch, the drainage layer is laid on the seepage prevention layer, and the anti-corrosion layer is laid on the drainage layer. According to the drainage ditch, the innovative design of combining the anti-corrosion layer, the drainage layer and the anti-seepage layer is adopted, so that a lower seepage body is effectively drained, the ditch body strength is improved, the basic requirements of confluence, quick drainage and seepage prevention of the drainage ditch are met, and the overall shear resistance and erosion resistance of the drainage ditch are improved; the construction method is suitable for construction of loose accumulation body slopes such as slide slag accumulation body slopes, waste slag accumulation bodies and mine dumping sites; the method has the advantages of being high in plasticity, high in terrain adaptability, high in environment flexibility, good in structure flexibility and the like.

The utility model discloses a barb clamping jaw strength testing device which comprises a base, a fixing seat is arranged on the base, a simulation mounting groove is formed in the fixing seat, a barb clamping jaw is arranged in the simulation mounting groove through a mounting bolt, and the groove bottom face of the simulation mounting groove is used for limiting the extending posture of the barb clamping jaw. An oil cylinder is further arranged in the stress direction of the barb clamping jaw, the telescopic end of the oil cylinder is connected with a rod joint bearing through a force sensor, the rod joint bearing is connected with a convex jaw through a rotating shaft, the convex jaw is arranged at the extending end of the barb clamping jaw in a sleeving mode and exerts acting force, and the oil cylinder is arranged on the base. According to the utility model, the maximum failure load bearing capability of the barb jack catch and the anti-shearing capability of the fixed bolt can be tested.

The invention discloses a method for constructing a shear constitutive model of a discontinuous structural plane. The method comprises the following steps: acquiring a peak value and a shear strength parameter in a residual stage; obtaining the initial rock mass shear strength tau of the discontinuous structural plane based on a Jennings criterion; introducing coefficients Xij and Xir to respectively adjust the normal stress at the joint and the rock bridge, and meanwhile, introducing a coefficient Omega to adjust the cohesive force of the rock bridge to obtain the rock mass shear strength tau of the adjusted discontinuous structural plane; based on a Lajtai rock bridge failure theory criterion, obtaining failure criteria of three discontinuous structural surfaces of tension, shearing and strength failure; and obtaining a shear constitutive model of the discontinuous structural surface corresponding to the rock bridge under the tension failure condition, the shear failure condition and the strength failure failure condition. According to the method, the shear constitutive model of the discontinuous structural plane is established, the shear behavior characteristics of the discontinuous structural plane can be effectively described, and the practicability of the constitutive model is effectively improved.

Building techniques and structures to fabricate components of expanded polystyrene (EPS) for assembly into a building include structures and ways to make keys to provide shear strength between components, structures and ways to minimize infiltration paths between walls and floors and walls and roof while reducing labor, material wastage and logistics complications. By way of example, components are strategically cut from a block of EPS using a hot wire moving through the block to cut components to a desired and novel configuration.

The invention discloses a gabion gabion net cage system for reinforcing a high-fill embankment of an expressway, belongs to the technical field of gabion gabion net cages, and solves the problems that in the prior art, external loads are resisted only through self-strength, and the gabion gabion net cage system and a filling body are difficult to form a synergistic deformation whole, so that the structure is cracked and fails. The system comprises an excavation roadbed, at least one group of filling slope foundations, gabion gabion gabion net cages and backfill discrete materials, according to the gabion gabion gabion grid net cage, through the synergistic effect of tensile resistance of the steel wire mesh and shear resistance of the block stones, the gabion gabion gabion grid net cage and the filling discrete material form a flexible-rigid composite structure, so that the high tensile property of the steel wire mesh can effectively restrain horizontal displacement and deep slippage of the filling material, and deformation of a side slope along a potential slippage face is restrained; and the gradation matching performance of the block stone filling structure and the backfill discrete materials enhances the occlusion effect between the materials, and the shear strength and the overall rigidity of the slope are remarkably improved.

The invention belongs to the technical field of segment splicing type bridges, and particularly relates to an anti-shearing structure of a segment splicing box girder and a construction method of the anti-shearing structure. The shear-resistant structure comprises a box girder body composed of a top plate, a web plate and a bottom plate, and further comprises two formwork units arranged at the two ends of the box girder body respectively in a pouring fixing mode, and a shell arranged on the formwork units and used for forming a concave key structure or a convex key structure of a shear key. The shear-resistant structure has the beneficial effects that the shear key formwork part of the shear-resistant structure at least comprises the formwork units and the shell, the shear key formwork part can effectively form the box girder body, does not need to be taken down during formwork removal and can also be used as a concave key structure and a convex key structure, and therefore the shear-resistant structure is simple and efficient during manufacturing and construction; and the precision is relatively high during splicing construction.

The utility model discloses a wrapped pile drilling and filling all-in-one machine which comprises a foundation mechanism and an executing mechanism, and the executing mechanism is connected to the foundation mechanism in a lifting mode. The basic mechanism comprises a power assembly, a walking assembly, a stand column and a supporting assembly, the stand column is arranged on one side of the walking assembly in a supported mode and supported through the supporting assembly, and the power assembly is arranged on the walking assembly and used for lifting the executing mechanism; the executing mechanism comprises a drilling assembly and a sleeve, the drilling assembly is arranged on the sliding rail of the stand column in a sleeving mode, and the drilling assembly is sleeved with the sleeve in a liftable mode; the power assembly comprises a main winch and an auxiliary winch. The all-in-one machine is suitable for treating mucky soil and soft plastic clayed soil foundations with undrained shear strength smaller than 20 kPa, and is particularly suitable for punching and pouring construction of saturated salinized soil foundation wrapped piles.

The utility model provides a prefabricated concrete beam dry type connection node, which belongs to the field of prefabricated buildings, and is characterized in that an upper high-strength bolt is arranged above the top surface (within the height of a floor) of a prefabricated concrete beam so as to increase the connection arm of force of the upper high-strength bolt, so that equal-strength node connection with a steel bar in the beam is realized by utilizing a single large-diameter high-strength bolt; the installation convenience is greatly improved; the upper high-strength bolt and the lower high-strength bolt are combined for clamping, so that tensile and compression-resistant bidirectional force transmission is realized (in a normal state, the upper high-strength bolt is tensile, and the lower high-strength bolt is compression-resistant; ), so as to cope with the bending moment change of the precast concrete beam under the action of the reciprocating load.

The invention discloses an angle steel connecting piece shear strength prediction method and system based on a physical information neural network, electronic equipment and a storage medium thereof. The method comprises the following steps: establishing a database containing a plurality of groups of test data based on a numerical simulation result of an angle steel connecting piece finite element model verified by a push-out test; embedding an angle steel connecting piece shear bearing capacity physical constraint condition based on an elastic foundation beam theory into a loss function of the data-driven neural network model DNN; training the neural network embedded with the physical constraint condition by using a database, and adjusting and selecting a physical item weight factor and a model learning rate so as to construct a shear bearing capacity prediction model of a physical information neural network (PINN); predicting the shear strength of the angle steel connecting piece by using the trained physical information neural network (PINN) shear capacity prediction model; according to the prediction method and system, the electronic equipment and the storage medium thereof provided by the invention, the accuracy and reliability of the shear resistance prediction of the angle steel connecting piece can be improved.

The invention particularly discloses a rock-soil body interface torsional shear characteristic and toughness parameter unit body test device which comprises a unit body sample blank manufacturing device, a centering device, a special drilling tool, a rib body and a torque load.The rock-soil body interface torsional shear characteristic and toughness parameter unit body test device has the beneficial effects that traditional direct shear / drawing shear is replaced with torsional shear loading; the problem that the interface contact area is reduced in the shearing process is thoroughly solved, it is ensured that the interface contact area of an anchor / pile and a rock-soil body is constant, a pressure water bag is arranged at the top of a test box unit body, the original overlying and confining pressure environment of a stratum is accurately simulated, a test anchor hole / pile hole is directly manufactured through a drilling technology, and the natural roughness characteristic of the hole wall is reserved to the maximum extent; the smooth wall surface limitation of traditional mold pore forming is broken through, the basic toughness concept of the anchor / pile-rock-soil body interface is defined for the first time, the nature of the basic toughness can be quantitatively represented by the robustness of the shear resistance of the interface, a matched toughness testing technology and evaluation method are developed, and a theoretical model and a calculation tool are provided for the toughness design of anchoring engineering and pile foundation engineering.