420 results about "Composite beams" patented technology

The invention discloses a corrugated steel web I-shaped section and a manufacturing method of a steel box composite beam, and relates to the technical field of steel box composite beams. The rod piece web I-shaped piece is installed on the side face of the bottom plate unit; the partition plate type web I-shaped pieces are installed on the side faces of the bottom plate units, and the partition plate type web I-shaped pieces are connected with the rod piece web I-shaped pieces; the solid-web type partition plate units are installed on the bottom plate units, and the solid-web type partition plate units are arranged between the partition plate type web I-shaped pieces; the truss type partition plate units are installed on the bottom plate units, and the truss type partition plate units are arranged between the rod piece web I-shaped pieces. The manufacturing method of the steel box composite beam comprises the steps that the bottom plate units, the web I-shaped pieces and the partition plate units are transported to a site to be erected, assembled and welded. The technical problem that in the prior art, a concrete bottom plate and corrugated steel web structure cannot meet the requirement for a large-span bridge is solved.

The invention provides a large-span corrugated steel web composite beam and a construction method thereof. The composite beam adopts section prefabrication and field assembly, and a composite abutted seam system is creatively adopted between beam sections. Butt welding is adopted for corrugated steel webs between beam sections, glue seams are adopted for concrete, and shear key teeth are matched, so that the self-alignment performance and the interface shear bearing capacity of a matching surface are improved; wave-shaped abutted seam notches are formed in the upper portions of the concrete top plate and the concrete bottom plate, concrete above abutted seams is a continuous pouring body, the waterproof performance is durable and reliable, and the long-term safety and the service life of the structure are effectively guaranteed under the condition that a waterproof leveling layer is not arranged. And in addition, the concrete in the notches is pre-pressed through the tensioning external prestressing procedure after the beam bodies are closed, the concrete at the abutted seams is further compacted, and super-strong durability is provided. A concrete waterproof layer does not need to be independently arranged on the main beam structure, the second-phase dead load borne by the main beam is effectively reduced while the work amount is reduced, and economic benefits are remarkable.

The invention relates to the technical field of building construction, in particular to an auxiliary scaffold for building a concrete filled steel tubular column and a composite beam, which comprises a support body consisting of a bearing screw rod inserted into the ground, a vertical rod mounted at the top end of the bearing screw rod in a threaded manner, a disc buckle fixed on the outer surface of the vertical rod and a bottom horizontal tube mounted on the disc buckle in a clamping manner, the number of the frame bodies is multiple, the multiple frame bodies are distributed at equal intervals and connected to form the scaffold, and leveling plates are arranged outside the bearing screws. A connecting mechanism is arranged above the leveling plate, the connecting mechanism comprises a base, a bearing seat and a locking piece which are sequentially distributed from bottom to top, and a horizontal connecting plate is hinged to the outer portion of the base. According to the auxiliary scaffold for building the concrete filled steel tubular column and the composite beam, the rotating locking piece moves downwards along with the bearing screw rod, the functions of unfolding the working platform and holding and locking the bearing screw rod can be synchronously completed, multiple construction steps are combined, and the building efficiency is greatly improved.

The invention belongs to the field of deep foundation pit intelligent supporting systems, and particularly relates to a deep foundation pit intelligent supporting system based on oblique beam grid and digital twinning and a collaborative construction method.The deep foundation pit intelligent supporting system based on oblique beam grid and digital twinning comprises an oblique beam grid supporting structure composed of two-way crossed steel oblique beams, and the outer layer of each steel oblique beam is a Q355B steel pipe with the thickness not smaller than 12 mm; the inclined beam is filled with ultra-high performance concrete with the compressive strength not smaller than 150 MPa, the inclination angle of the inclined beam ranges from 25 degrees to 60 degrees, and an MEMS micro-electro-mechanical system sensor is pre-buried at a node; and the digital twin platform integrates the geological BIM model and the LSTM neural network prediction model. The bending rigidity is improved through the oblique beam grid supporting structure and the concrete filled steel tube composite beam, the inclination angle ranges from 25 degrees to 60 degrees, force flow transmission is optimized, and micro-strain-level stress monitoring is achieved through the MEMS sensors embedded in the nodes. A digital twin platform and an LSTM model are fused with 12-dimensional parameters, the 72-hour deformation prediction error is smaller than or equal to 1.5 mm, and compared with a traditional experience algorithm, the precision is improved.

The invention provides a composite beam reliability optimization method based on a failure probability function. The method comprises the following steps: 1) defining a random input variable, a design variable, a target function and a performance function; 2) calculating a failure sample and an extended failure probability based on an autonomous learning Kriging agent model and a Monte Carlo method according to the Bayesian theory; the method comprises the steps of (1) calculating a design parameter failure sample, (2) calculating a joint probability density implicit function on the basis of an adaptive K-nearest neighbor method and autonomous learning Kriging according to the calculated design parameter failure sample, and (3) calculating a failure probability implicit function on the basis of the Bayesian theorem.By means of the method, the problem that in the reliability optimization process, the calculation cost is difficult to bear due to reliability analysis is solved.

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

The invention relates to the technical field of simulation calculation, in particular to a simulation calculation method of a U-shaped steel-encased-concrete composite beam, which comprises the following steps: S1, establishing a two-parameter interface equivalent stiffness model of the U-shaped steel-encased-concrete composite beam with a rear anchor bolt; s2, solution and response extraction; s3, calculating a slip residual error and interface energy, and judging whether a target slip feature is met or not according to a double-convergence criterion; if the convergence requirement is not met, adaptively updating the interface parameters and returning to S2 for repeated solution, and if the convergence criterion is met, applying the converged interface rigidity parameters to design feedback of pretightening force selection of the rear anchor bolts and anchor bolt spacing and node construction of the rear anchor bolts. According to the method, the two-parameter interface equivalent stiffness model and the adaptive algorithm based on the slip residual error enable the interface normal stiffness and the interface tangential stiffness to be automatically converged to the target slip characteristic, manual parameter adjustment is avoided, the simulation stability and the calculation precision are improved, and integration of composite beam structure design and simulation analysis is achieved.

The arc additive and subtractive composite fixed-beam single-gantry structure comprises a lathe bed and a cross beam, the cross beam is arranged on the lathe bed in a sliding mode, the sliding direction of the cross beam is orthogonal to the length direction of the cross beam, and an additive module and a subtractive module are arranged on the cross beam in a sliding mode; the material adding module comprises a material adding slide carriage arranged on the cross beam in a sliding mode, a six-axis robot is arranged on the material adding slide carriage in a lifting mode, and a welding gun is arranged at the output end of the six-axis robot. The material reducing module comprises a material reducing slide carriage arranged on the cross beam in a sliding mode, and an electric spindle used for installing a material reducing tool is arranged on the material reducing slide carriage in a lifting mode. The additive module and the subtractive module are integrated on the same cross beam and share a high-precision cross beam guide rail, so that repeated positioning errors caused by a lathe bed and a gantry body of a traditional multi-gantry type structure are effectively avoided, and the manufacturing precision and stability are remarkably improved; and in addition, seamless connection or rapid switching of the material increasing procedure and the material decreasing procedure on the same station is achieved, the manufacturing process is simplified, and the overall manufacturing quality is improved.

This invention discloses a prefabricated bamboo-concrete composite frame beam-column joint, comprising bamboo fiber tube concrete columns and composite beams. During on-site assembly, an outer sleeve is inserted into the bamboo fiber tube at the joint area, and adhesive is injected for bonding. The bamboo beam and steel joint are then assembled to form the composite beam. Reliable connections between the bamboo fiber tube, the outer sleeve, and the steel joint are achieved using through bolts or single-sided bolts. Finally, concrete is poured into the tubes, and the structure is cured to form the final structure. The prefabricated composite beam-column joint components assembled by this invention are lightweight, high-strength, energy-saving, and emission-reducing. The resulting beam-column joint fully utilizes the material combination effect, minimizing cross-sectional dimensions and material usage while maximizing load-bearing and deformation capacity. On-site assembly requires minimal hoisting equipment and temporary supports, eliminating much of the formwork and finishing work required for the main structure. This achieves a "high-performance, low-cost, and easy-to-construct" composite structural system. The steel joints at the beam ends form a seismic-resistant beam hinge mechanism with strong energy dissipation capacity, ensuring outstanding seismic performance of the frame structure.

The application discloses a kind of UHPC connection's double post-tensioning prefabricated prestressed concrete frame structure system, including prefabricated concrete upper column, prefabricated concrete lower column, double post-tensioning prefabricated prestressed concrete composite beam, UHPC node core area and composite slab.The upper longitudinal main reinforcement, lower longitudinal main reinforcement, ordinary steel and post-tensioning prestressed tendon are directly anchored in UHPC node core area.The structure system is not only convenient and fast in field construction, improves component installation efficiency, but also can greatly reduce the anchoring length of steel bar, greatly reduce the amount of stirrup in node core area, avoid crowded steel bar in node core area, and reduce the cross-sectional height of component, reduce self weight, improve component crack resistance and self-recovery performance, thereby improve the seismic performance of overall frame structure.Double post-tensioning design can be reasonably designed according to different span, different load, different seismic intensity and other requirements, reduce cost, meet the use requirements.

The invention discloses a composite laser cutting device which comprises a first light source, a second light source, a first reflecting mirror, a spectroscope, a focusing mirror, a first energy distribution adjusting assembly and a second energy distribution adjusting assembly, and further discloses a composite laser cutting method which comprises the following steps that a light beam is emitted, and energy distribution of the composite light beam is controlled. The method has the beneficial effects that distribution control and application of multi-level energy are achieved, and the efficiency and quality of composite beam laser cutting can be rapidly improved by controlling the energy density of the whole body and the center. The laser cutting machine can be well applied to laser cutting, is particularly suitable for cutting thick plates and composite plates, can cut transparent materials with high efficiency, and can overcome the technical problem that a laser cutting machine in the prior art is difficult to effectively cut the transparent materials and superhard materials.

The utility model discloses a formwork-free on-site assembly steel-concrete composite beam structure. The composite beam structure comprises two H-shaped steels, a steel beam and a steel beam, channel steel; two pieces of angle steel with opposite openings are arranged on the upper flange plates on the two sides of the channel steel; two folding flanges are arranged on the top face of the steel tank, and the transverse inner side faces of the folding flanges are connected to a lower flange plate of one piece of H-shaped steel; the bottom end of the long bolt rod is provided with a nut and embedded into concrete poured in the steel groove, the top end of the long bolt rod is upwards fastened, the upper flange plate and the transverse plate of the angle steel are connected in an overlapped mode, and the top end of the long bolt rod is provided with a nut and embedded into concrete poured in a groove cavity formed between the angle steel. According to the steel-concrete composite beam structure, the steel-concrete composite beam can be directly assembled on site through hot-rolled section steel products, the steel structure machining and manufacturing links are avoided, welding, formwork installation and reinforcing steel bar binding operation are not needed, the technological process is greatly shortened, independent replacement of a single component can be achieved in the operation period, and economic benefits are remarkable.

The application provides a combined beam assembly and an off-road vehicle frame thereof, and the combined beam assembly comprises a box-shaped support beam and two supports; the box-shaped support beam comprises a bottom plate, two first vertical plates and a top plate; the two first vertical plates are vertically connected to the bottom plate and are distributed on the circumferential side of the bottom plate; the top plate is connected to the two first vertical plates and encloses the two first vertical plates and the bottom plate to form the box-shaped support beam; at this time, the load capacity and the connection strength of the combined beam assembly are improved through the box-shaped support beam, and the two supports are arranged on the two sides of the box-shaped support beam and are used for connecting left and right longitudinal beams, so that the left and right longitudinal beams are connected through the combined beam assembly, the left and right longitudinal beams are reinforced, the overall load capacity of the combined beam assembly, the left longitudinal beam and the right longitudinal beam is improved, and in addition, the two supports are detachably connected to the bottom plate, and the connection between each support and the bottom plate is arranged on the outer side of the first vertical plate.

The invention discloses a steel anchor box located at the stiffening position of an n-shaped composite beam web and a mounting method of the steel anchor box, and relates to the technical field of bridge engineering, the steel anchor box comprises a supporting body, a bottom supporting assembly and a middle supporting assembly, and the bottom supporting assembly is mounted at the lower end of the supporting body; the bottom supporting assembly and the supporting body jointly support the stiffening position of a web of the composite beam, the upper end of the supporting body is used for making contact with an upper flange plate of the composite beam, and one side of the supporting body is used for making contact with the web of the composite beam and can limit stiffening ribs. The lower end of the bottom supporting assembly is used for making contact with a lower flange plate of the composite beam, the middle supporting assembly is located in the supporting body, and the upper end and the lower end of the middle supporting assembly can stretch out of the supporting body and are supported on an upper flange plate of the composite beam and the lower flange plate of the composite beam. Reutilization of the decommissioned waste beam is achieved, the structure is simple, and local deformation when the structure is stressed can be effectively reduced.

The application relates to a short-line method for assembling and pushing installation of a full-precast composite beam, wherein the full-precast composite beam is supported on the top of two abutments and a plurality of piers, the full-precast composite beam comprises a plurality of composite beam components spliced along the transverse bridge direction, the composite beam component comprises a plurality of composite beam segments spliced along the longitudinal bridge direction, the composite beam segment comprises a bridge deck segment composed of two spliced concrete bridge deck plates and a steel beam segment composed of two spliced steel beams, and the bridge deck segment is arranged on the steel beam segment; during construction, the composite beam segments are precast in a factory, then transported to the abutment and spliced on the splicing platform in the longitudinal direction, the full-precast composite beam behind the splicing is transported to the bridge site through a pushing construction method, and a cast-in-place zone is arranged between the concrete bridge deck plates of the full-precast composite beam to connect the full-precast composite beams into a whole in the transverse bridge direction. The application has the advantages of simple structure, reasonable design, good durability, reduced steel consumption, simple method and great application prospect.

The application discloses a UHPC connected post-tensioned non-bonded co-tension prefabricated prestressed concrete frame structure system, which comprises a prefabricated concrete upper column, a prefabricated concrete lower column, a post-tensioned non-bonded co-tension prefabricated prestressed concrete composite beam, a UHPC node core area and a composite slab. The structure system is not only convenient and fast in on-site construction and improves the component installation efficiency, but also can greatly reduce the steel bar anchoring length, greatly reduce the amount of stirrups in the node core area, avoid the congestion of the steel bars in the node core area, reduce the component section height, reduce the self weight, improve the component crack resistance and self-recovery performance, thereby improving the seismic performance of the overall frame structure. The pre-tensioned prestressed steel bars can make the prefabricated beam less supported or free of support during construction, thereby reducing the construction cost, and the post-tensioned non-bonding can enhance the integrity of the frame, so that the structure has a certain self-resetting capacity and structural toughness in the earthquake, and the post-earthquake repair cost is reduced.

This invention provides a saddle-shaped cable-beam composite beam for pedestrian suspension bridges, a suspension bridge, and a construction method. The composite beam includes a bridge body, two upper main cables positioned above the bridge body, and two lower main cables positioned below the bridge body. Both the upper and lower main cables are arranged along the length of the bridge body. The two upper and two lower main cables are located on both sides of the bridge body. The two upper main cables are connected to both sides of the bridge body via suspenders in an inverted V-shape. The two lower main cables are connected to both sides of the bridge body via adjustable-length cables. Each cable includes a first cable, with its two ends connected to the lower main cable and the corresponding side of the bridge body, respectively. The first cable is also in a V-shape. This invention utilizes a saddle-shaped cable-beam composite beam to increase the lateral and vertical stiffness of the bridge body, enabling the continued application of pedestrian suspension bridges in the large-span range and continuing to leverage the advantages of large span capacity, thus achieving good economic benefits.

The invention relates to the technical field of steel-concrete composite beam installation, in particular to a control device and method for segmented installation of a river-crossing steel-concrete composite beam. The control device comprises a hoisting system and an adjusting tool composed of a shaping square frame, a combined keel and a positioning frame; the four end corner positions of the square fence are each provided with a movable support in a sliding mode, crawler wheels are arranged at the lower ends of the four movable supports, and the balance adjuster comprises a lever traction assembly used for pulling the two movable supports on the same side to vertically ascend and descend so as to keep the front and back of the square fence flush. The adjusting tool is designed to be a detachable shaping square frame, a keel and a positioning frame module are combined, segmented hoisting and on-site assembly are achieved in combination with a hoisting system, and the vertical height and the inclined supporting angle of the movable support can be monitored in real time and automatically adjusted; the combined keel is hoisted through a second hoisting device; and the splicing process is beneficial to reducing manual adjustment operation and shortening the construction period.

The invention discloses a loading mechanism, and relates to the technical field of bridge member degradation evaluation, the loading mechanism comprises a test piece loading table, a counter-force support structure and a loading device, the test piece loading table comprises a waste composite beam, a plurality of anchoring tables are fixedly connected to a web of the waste composite beam along the length direction, the counter-force support structure comprises a distribution beam, a counter-force beam and an anchor rod, and the loading device is arranged on the distribution beam. The distribution beam is located below the counter-force beam, a flange of the distribution beam is attached to a flange of the counter-force beam, anchor rods are fixedly connected to the two ends of the counter-force beam, the anchor rods at the two ends of the counter-force beam penetrate through anchoring tables symmetrically arranged on the two sides of the web respectively and are fixedly connected with the anchoring tables, and the loading device is fixedly connected to the distribution beam. A supporting cushion block is arranged on the upper end face of the waste composite beam, a to-be-tested piece is placed on the supporting cushion block, and the to-be-tested piece is located below the loading device and attached to the output end of the loading device. According to the invention, the economical efficiency is relatively good, the reutilization of wastes is realized, and the flexibility of a test space is relatively high.

The application discloses a kind of assembly design method, device and equipment of no-wet joint assembly type composite beam, method includes the following steps: based on wet joint concrete slab, according to the span of composite beam and preset span height ratio, the parameter of precast slab section is calculated;Based on the disadvantage load of composite beam, the load combination design value and standard value on composite beam are calculated;Determine the discriminant condition of no-wet joint assembly type composite beam design;Determine the invalid critical gap c cr Of concrete slab under no-wet joint condition, and the splicing gap c of composite beam must not be greater than c cr ;According to the deflection of the splicing gap of different composite beams, judge by stiffness discriminant condition, output the economic index of multiple schemes;According to economic index sequencing, the bearing capacity of composite beam is calculated in turn until stress discriminant condition is met, and no-wet joint composite beam assembly is carried out.The application ensures that shear key is uniformly distributed along the length of beam, and reduces the precast precision requirement of concrete slab.

The invention discloses a superposed beam hanging basket structure stress checking calculation method based on multi-working-condition load combination, and belongs to the technical field of bridge construction safety monitoring. According to the method, a beam element finite element model based on the actual geometric dimension and the connection relation is established, and the boundary conditions of hinge constraint or spring unit constraint and lateral displacement limitation are set; load parameters including dead load, live load and wind load are defined, a multi-working-condition load combination is set according to building structure load specifications, and the structural safety is judged by comparing strength and deflection after calculation. The method is mainly used for solving the problem of inaccurate stress evaluation caused by single load working condition and simplified boundary condition in the traditional hanging basket checking calculation, and provides more reliable safety guarantee for the construction of the hanging basket of the composite beam bridge.

The invention relates to the technical field of constructional engineering, and discloses a factory building large-span steel-concrete composite beam which comprises a steel beam body, a connecting assembly is fixedly connected to the upper surface of the steel beam body, a concrete plate is fixedly connected to the upper surface of the connecting assembly, and a hole is formed in the steel beam body; and baffles are slidably connected to the interiors of the two sides of the steel beam body, grips are fixedly connected to the outer walls of the baffles, supporting ribs are fixedly connected to the interior of the steel beam body, and the center points of the supporting ribs correspond to the center points of the holes. The connecting assembly is additionally arranged between the steel beam body and the concrete slab, so that under the large-span condition, loads can be effectively dispersed and transmitted, the bearing capacity of the composite beam is improved, the composite beam adapts to the complex stress environment of a plant, meanwhile, thermal expansion and cold contraction stress can be buffered, supporting can be assisted through gas pressure, and the service life of the composite beam is prolonged. And the structural stability of the composite beam under the temperature change is improved.

This invention provides a dry lens AOI inspection method and system, relating to the field of contact lens manufacturing technology. The invention first performs a shell removal process on the cured shell mold to separate the lens from the shell mold. Then, the lens is attached to the shell mold for AOI inspection. Multiple illumination sources are combined to form a composite beam that illuminates the lens and acquires images. Image enhancement and analysis, combined with adjustments to light source parameters, are used to identify defects. Results that do not meet thresholds are subjected to depth analysis. Finally, defect statistics are completed and an inspection report is generated. This invention simplifies the inspection process, improves inspection efficiency and accuracy, achieves precise determination of lens defects, and is adaptable to the inspection needs of different types of contact lenses.

This invention discloses a steel-framed thin-layer UHPC-NC composite beam, comprising a steel frame, a face plate, a web plate, and a bottom plate, the width of the face plate being smaller than the width of the bottom plate; a UHPC layer cast on the outside of the steel frame; a top plate fixed to the steel frame; and shear keys, Ω-shaped, with their bottom ends fixed to the face plate. The construction method includes the following steps: S1, fabricating the steel frame; S2, welding and fixing the shear keys to the top of the face plate; S3, distributing prestressed steel strands below the bottom plate; S4, casting the UHPC layer and curing to the required strength; S5, casting the top plate above the face plate. Through the composite structural design of the steel frame, thin-layer UHPC, and ordinary concrete top plate, the advantages of each material are fully utilized, improving the beam's crack resistance, durability, and buckling resistance. This effectively controls project costs, balancing structural safety, economy, and ease of construction, providing a high-performance, low-cost new composite beam solution for medium-span projects.

To provide a method capable of efficiently crushing a deck slab of a composite girder equipped with stud dowels. [Solution] A worker places an impulse-generating agent 15 on the girder portion 11. The impulse-generating agent 15 includes a pair of first impulse-generating agents 16 arranged on opposite sides of the stud dowel 4 in the bridge axis direction. The height of the charge center of the first impulse-generating agent 16 from the top surface of the steel main girder 3 is equal to or less than a first predetermined value. The distance between the first impulse-generating agent 16 and the stud dowel in the bridge axis direction is equal to or less than a second predetermined value. The worker detonates the impulse-generating agents 15 at approximately the same time.

The FRP concrete filled steel tube composite beam with the bolt pins comprises a rectangular thin-wall square tube and an FRP core tube with the same length as the rectangular thin-wall square tube, and the FRP core tube is arranged in an upper compression area in the rectangular thin-wall square tube. Inter-pipe filling materials are arranged between the FRP core pipe and the rectangular thin-wall square pipe, and the FRP core pipe is filled with core pipe concrete; steel bolts penetrating through the rectangular thin-wall square tube are evenly distributed on the top face or the side face of the rectangular thin-wall square tube in the length direction, the steel bolts penetrate through the center of the cross section of the FRP core tube, and extension sections are reserved at the positions, on the surface of the rectangular thin-wall square tube, of the two ends of each steel bolt. The FRP material has excellent tensile property, and after the FRP core pipe is arranged in the structure compression area, the concrete performance of the compression area is remarkably improved through the constraint effect provided by the FRP core pipe. By arranging the steel bolts penetrating through the whole structure, the bonding performance between the inter-pipe filling material and the inner wall of the steel pipe is improved, the interface slippage amount is reduced, and the bearing capacity and ductility of the test piece are improved. And the filling material between the pipes adopts the combination of concrete and polyurethane foam, so that the self weight of the structure can be effectively reduced.

This invention relates to the field of seismic resistance technology for spatial frame structures, and discloses a method for determining the energy dissipation mechanism of a steel-concrete composite column-composite beam spatial frame. The energy dissipation mechanism includes steel beams, steel-concrete composite columns, and reinforced concrete slabs. The steel beams are welded and fixed to the steel-concrete composite columns via reinforcing rings, and the steel beams are fixedly connected to the reinforced concrete slabs via studs. Tie bars are provided at the ends of the steel-concrete composite columns. The ratio of the flexural bearing capacity of the steel beams to that of the steel-concrete composite columns is within the range of 0.42 to 1.05. By introducing the ductile damage parameter of the steel, combined with the inter-story drift angle, cumulative energy dissipation, beam-column energy dissipation ratio curve, and finite element calculation results of stiffness damage of the spatial frame, the energy dissipation characteristics and energy dissipation mechanism type of the structure are determined. This invention aims to solve the technical problems in the prior art where the steel-concrete composite columns do not form sufficient compression-bending hinges for energy dissipation during seismic resistance, easily leading to collapse, and the technical problems of using beam energy dissipation mechanisms in seismic design while rarely considering column energy dissipation.

This application provides a track beam device for a multi-level parking garage and the multi-level parking garage itself. The track beam device includes an upper track beam, which in turn includes an H-shaped steel main beam; a pair of H-shaped steel secondary beams located on both sides of the H-shaped steel main beam, with the upper and lower surfaces of the pair of H-shaped steel secondary beams forming a first track surface and a second track surface, respectively; and a plurality of reinforcing units evenly spaced between the H-shaped steel main beam and the pair of H-shaped steel secondary beams along the extension direction of the H-shaped steel main beam, and connected to both the H-shaped steel main beam and the pair of H-shaped steel secondary beams. This application, through the parallel arrangement of the H-shaped steel main beam and the two H-shaped steel secondary beams, enables the upper track beam to form a composite beam structure, thereby significantly improving the lateral stiffness and bending resistance of the upper track beam and evenly distributing the dynamic load of the vehicle platform.

The invention discloses a steel-UHPC (Ultra High Performance Concrete) composite beam and a design system for fine deflection control of the steel-UHPC composite beam. The system comprises a set of complete design method and a composite beam structure optimized for realizing the method. The core of the design system is to provide a dual design methodology: 1, the method is a high-fidelity refined design method based on a UHPC nonlinear stretching constitutive relation; according to the method, the residual tension contribution in the tension area is accurately quantified, and the problem of underestimated rigidity caused by neglecting the contribution in the traditional theory is solved. And secondly, the method is a simplified design method which is based on a traditional conversion section method and is calibrated. According to the simplification method, a creative convenient design tool capable of quickly determining the initial size of the structure is provided for engineers. According to the method, the structural performance is remarkably improved, on the premise that the standard deflection requirement is met, the beam body height can be greatly reduced, the structural dead weight is reduced, and the economic and technical advantages which cannot be achieved through a traditional method are obtained.

The invention discloses a prestressed truss composite beam for constructional engineering, and relates to the technical field of building trusses. The device comprises a chord frame assembly, a plurality of chord members used in cooperation, a node assembling assembly, a plurality of U-shaped pieces arranged on the end faces of the chord members in a sleeving mode, an inclined frame assembly, a plurality of sets of inclined rods obliquely arranged between the left U-shaped pieces and the right U-shaped pieces, and a prestress linkage assembly, comprising frames located between the U-shaped piece and the end face of the chord member, a steel strand is arranged between every two connected frames, and a winding rod used for winding the steel strands is arranged in each square opening. The steel strands are tensioned and straightened through rotation of the winding rods in the two groups of connected frames, the strength of joints of the two groups of chord members is improved, the bearing load of the joints of the two groups of chord members is improved, the chord members, the inclined rods and the U-shaped pieces are arranged to be of a triangular structure through matched use of the U-shaped pieces and the inclined rods, and the assembly stability of structural parts is improved.