958 results about "Composite beams" patented technology

The invention provides an ultra-short beam homogenization transmission line system and method based on a four-eight-pole composite magnet. The system comprises the four-eight-pole composite magnet, a system, a linear beam homogenization structure, a bent beam homogenization structure and secondary iron used for a beam homogenization transmission line. The system further comprises an ultra-short linear beam homogenization transport line, an ultra-short bent beam homogenization transport line, an ultra-short linear bent composite beam homogenization transport line and an ultra-short symmetrical bent beam homogenization transport line based on the homogenization structure and / or the dipolar iron. The method comprises an exciting current debugging method based on the four-pole and eight-pole composite iron and a linear type and bending type beam debugging method. According to the invention, the problem that the maximum enveloping part on the transmission line is occupied and the effect of octopole iron cannot be fully exerted is solved; the problems that the beam envelope of the position where the octopole iron is located is small, and the requirement for the field intensity of the octopole magnet is high are solved. The problem that the civil engineering shielded around the transmission line is more expensive because the transmission line is too long is solved.

The invention provides a corrugated steel web composite beam performance detection device and method, and belongs to the technical field of composite beam performance detection.The corrugated steel web composite beam performance detection device comprises a base, a composite beam, a counter-force device and two placing frames installed on the base; the counter-force device comprises a plurality of mounting beams which are arranged at equal intervals and cross beams which are mounted on the inner sides of the mounting beams, and further comprises a moving mechanism, an adjusting mechanism and a detecting mechanism, and when the performance of the composite beam is detected, a first driving motor and a second driving motor on the same side are controlled by a controller to rotate, so that the performance of the composite beam is detected; the loading devices and the fixing pieces on the same side move synchronously, the two-way driving state of a vehicle in the actual situation is simulated, pressure detection on different positions of the two sides of the composite beam is achieved, and the authenticity of the detection result 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 provides a modular assembly type steel reinforced concrete combined beam column joint and an assembly method thereof. The modular assembly type steel reinforced concrete combined beam column joint comprises a joint core, a steel reinforced concrete combined column, a steel reinforced concrete combined beam, a plurality of single-side self-locking high-strength bolts and a plurality of common high-strength bolts. The node core comprises a node core cavity, at least one connecting end and at least one group of L-shaped connecting end plates; threaded holes are formed in the corresponding positions of the L-shaped connecting end plates. The steel reinforced concrete combination column comprises a column-shaped steel framework and column concrete wrapping the column-shaped steel framework. Bolt holes are formed in the corresponding positions of the columnar steel framework; bolt holes, grouting holes and grout outlet holes are reserved in the corresponding positions of the column concrete; the steel reinforced concrete composite beam comprises a beam shoe, beam H-shaped steel and beam concrete wrapping the beam H-shaped steel. Bolt holes are formed in the corresponding positions of the beam H-shaped steel. The beam shoe is used for being connected with the node core. The scheme has the advantages of convenience in field assembly, high connection reliability, short construction period, capability of realizing dry connection and the like.

The invention relates to the technical field of engineering design, in particular to a truss-web type steel-concrete composite beam deflection calculation method and system.The method comprises the steps that a mechanical simplified model of a truss-web type steel-concrete composite beam is built, calculation assumption is determined, and a calculation scheme is obtained; determining the acting mode of the external load on the composite beam; basic calculation parameters of the combined beam mechanical simplified model are determined; according to the action mode, calculating a rigidity reduction coefficient of the simply supported beam caused by shear deformation of a truss web member, a slippage effect of a steel-concrete connection interface and local deformation of a node under the action of different loads; calculating the equivalent flexural rigidity of the truss-web type composite beam; and calculating the deflection of the truss-web type steel-concrete composite beam under the action of different loads. By means of the method, the problem that an existing calculation method is poor in pertinence and applicability is effectively solved, so that the stress condition of the truss web type steel-concrete composite beam structure is correctly reflected; according to the method, multiple influences caused by discontinuity of the truss web members, including shear deformation of the truss web members, a slippage effect of a steel-concrete connection interface and additional deflection caused by local deformation of the nodes, are considered, and the midspan deflection of the truss-web type steel-concrete combined simply supported beam can be conveniently evaluated.

The invention relates to the technical field of bridge construction, and provides a construction method of a cable-stayed-continuous cooperative system composite beam bridge, which does not need to arrange a large batch of prestressed corrugated pipes and steel beams to ensure the use performance of a bridge deck slab, fully utilizes the structural characteristics of the cable-stayed-continuous cooperative system composite beam bridge, and improves the construction efficiency of the cable-stayed-continuous cooperative system composite beam bridge. By changing the overlapping sequence of the continuous composite beam bridge deck slabs, it is guaranteed that the bridge deck slabs in the hogging moment area of the continuous composite beam do not generate tensile stress, the bridge deck slabs in the sagging moment area generate pressure stress reserve, and by increasing the tension stay cable force, the continuous composite beam moves upwards close to a side main beam of the cable-stayed bridge and moves downwards close to a side span side main beam; the bridge deck slab generates compressive stress, the steel main beam generates tensile stress, the compressive property of concrete materials and the tensile property of steel are fully played, the material utilization rate is increased, the compressive pre-stress of the bridge deck slab is completed through internal force distribution of the composite beam, the construction method is simple and operable, the structural stress is clear, and the reasonability and safety of the structural stress are guaranteed.

The invention relates to the technical field of structural engineering, and discloses a post-fatigue residual stiffness calculation method for an assembly type composite beam, which comprises the following steps: acquiring three-dimensional laser point cloud data and thermal infrared image data of the composite beam, and registering the three-dimensional laser point cloud data and the thermal infrared image data; quantifying the macroscopic geometric defect based on the multi-modal data; welding area features are extracted, and micro-crack forms are recognized; constructing a microcrack network diagram and extracting parameters; evaluating the influence of the microcrack network on the local rigidity by adopting a self-attention map neural network, and obtaining a rigidity parameter after multi-scale damage correction in combination with the influence of the macroscopic geometric defect; calculating residual stiffness after fatigue by combining fatigue load history; according to the method, the initial geometric defect and the early microscopic damage can be comprehensively considered, and the accuracy of the residual stiffness calculation of the fabricated composite beam is improved.

A composite wall and building system. The composite wall and building system provide a structural beam formed of fiberglass composite having one or more flanges that engage with an insulation member. The structural beam may be formed in a variety of dimensions and profiles. A plurality of structural beams is used together to form a wall or other parts of the building. A panel is used to cover the beams and insulation. The wall sections are joined together with interlocking beams and fasteners are used to secure the beams to each other and wall sections to other wall sections. The composite beams and insulation are coated with a fire-retardant material. A modified beam is used in certain applications for additional strength and connection points with other preexisting wood structures.

The invention discloses a decoupling vibration isolation composite beam frame structure shaped like a Chinese character'tian 'and a high-precision four-mass double-shaft micro-accelerometer thereof. The structure comprises at least four outer ring straight beam mechanisms and at least four decoupling vibration isolation rings. The accelerometer comprises a substrate layer and a device layer, and the device layer comprises the decoupling vibration isolation composite beam frame structure shaped like the Chinese character'tian ', an X-axis dual-mass sensing unit and a Y-axis dual-mass sensing unit. The problem of inter-axis cross coupling of double-axis acceleration detection is solved, isolation and vibration reduction of the MEMS accelerometer to the surrounding environment are achieved, and the influence of temperature and environment vibration on the measurement precision of a device is effectively restrained; by adopting a mode of crosswise arranging the electrode positions, the output error of the MEMS microstructure caused by process mismatch can be effectively inhibited, so that the output precision of the device is improved; each axial direction is designed in a combination mode that double mass sensing unit modules are connected in parallel, so that the detection sensitivity of the device is improved exponentially.

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 utility model relates to a longitudinal beam assembly positioning beam combining system which comprises a conveying station, a positioning station and an overturning station which are sequentially arranged in parallel. The positioning station is provided with a lifting and transferring device, the overturning station is provided with an overturning device, the longitudinal beam assembly is conveyed to the positioning station through the conveying station, the positions of the longitudinal beam assembly are converted through the lifting and transferring device for beam combination, the longitudinal beam assembly subjected to beam combination is overturned through the overturning device, and the overturned longitudinal beam assembly is transferred to a buffer area through a lifting appliance; the overturning station is provided with an overturning device, the downward-buckled longitudinal beam assembly is overturned by 90 degrees to be erected, the upper wing face of the longitudinal beam assembly is made to face upwards, and a longitudinal beam feeding mechanism is operated to hoist the longitudinal beam assembly so that the longitudinal beam assembly can be conveniently hoisted to a buffer area; according to the frame needing to be provided with the reinforcing plate, the longitudinal beam assembly is overturned outwards by 180 degrees through the overturning device, the inner ventral face of the longitudinal beam assembly faces upwards, the assembling space is large, a machining person can assemble the reinforcing plate conveniently, and operation is convenient.

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 utility model discloses a prefabricated concrete beam-slab connecting node free of a mold and an installation support, which comprises a prefabricated laminated beam and a laminated slab, the prefabricated superposed beam is configured to be an inverted trapezoidal section which gradually extends outwards towards the two sides of the prefabricated superposed beam in the height direction of the prefabricated superposed beam from the bottom of the prefabricated superposed beam to the connecting face, matched with the superposed plate, of the prefabricated superposed beam. Connecting bosses are formed at the two ends of the connecting face, matched with the laminated slab, of the prefabricated laminated beam, and the laminated slab can be erected on the connecting bosses at the two ends correspondingly; the prefabricated composite beam is configured to have the inverted trapezoidal section, so that the connecting bosses are formed at the two ends of the connecting surface, matched with the composite slab, of the prefabricated composite beam, the composite slab can be directly erected on the connecting bosses, and the composite slab is supported through the connecting bosses, so that mounting and dismounting of a temporary mounting support are omitted, construction cost is saved, construction is simple, and construction efficiency is improved. And the efficiency is high.

The invention discloses a terahertz wave band composite beam RF MEMS switch with low driving voltage, and belongs to the field of radio frequency front-end devices. The device is composed of a direct current port metal block, a direct current bias line, a microstrip line matching structure, a composite beam MEMS switch, a composite beam middle conduction structure, a metal electrode of a composite beam, a silicon nitride insulating layer, a quartz glass substrate, a coplanar waveguide metal ground and a metal ground. The composite beam MEMS switch is formed by combining a silicon dioxide material clamped beam and a metal beam adsorbed below the silicon dioxide material clamped beam, a direct current port is connected to the anchor point position of the metal beam and a metal electrode through a direct current bias line, and different direct current voltages can be input through the direct current port to control the lifting state of the composite beam and the pull-down state of the composite beam adsorbed to the electrode. The two switches respectively correspond to an off state and an on state of the switch. The composite beam MEMS switch works below 140GHz, so that low driving voltage, low insertion loss and high isolation are realized. The reaction time of microsecond magnitude is achieved, destructive deformation is not prone to occurring, the structure is simple, and manufacturing is easy.

The invention discloses a calculation method and a computer system for shear bearing capacity of a profile steel-ultra-high performance concrete composite beam with a composite web. The calculation method comprises the following steps: step 1, obtaining shear bearing capacity Vu and HRS provided by the profile steel web; 2, the shear bearing capacity Vu, UHPC provided by the ultra-high performance concrete web is obtained, and Vu, UHPC = Vc + Vf + Vs; and 3, the shear capacity Vu of the profile steel-ultra-high performance concrete composite beam with the composite web is obtained, and Vu = Vu, HRS + Vu, UHPC. The calculation method provided by the invention can be well suitable for the section steel-ultra-high performance concrete composite beam with the composite web, and has good precision and reliability.

The invention discloses a self-prestressed steel beam with local constraint, a dry-type connecting frame structure, a beam slab system and a construction method.The self-prestressed steel beam is formed by connecting I-shaped steel I and I-shaped steel II in a staggered mode, and the inner surface of a lower flange of the I-shaped steel I and the inner surface of an upper flange of the I-shaped steel II are each provided with a row of studs on the two sides of a web in a welded mode; longitudinal steel bars are bound on the studs, prefabricated high-strength concrete is poured into a formwork in the flanges, webs of the first I-shaped steel and webs of the second I-shaped steel are in dry connection through connecting plates and high-strength bolts, and the self-prestressed steel beams and the prefabricated reinforced concrete columns are connected to form a truss frame. Two frames are connected through a prefabricated composite beam to form a frame beam-column system, a self-resetting device and a friction energy dissipation device are arranged at a beam-column joint, and a beam-slab system is obtained by combining a prefabricated double-T-shaped composite floor slab and a dry-type connecting frame structure, so that the problems of low anti-seismic property, difficulty in repairing after an earthquake and the like existing in traditional dry-type connection can be solved; and the structural integrity is improved.

The invention relates to the technical field of bridge construction, and discloses a method for calculating the rigidity of a composite beam connected by high-strength bolts, which comprises the following steps of: considering the most unfavorable load possibly occurring in a normal use stage and a construction stage during calculation, calculating a standard value of the most unfavorable load combination on the composite beam, and setting a mid-span displacement judgment value at the same time. The method analyzes the stress state of the steel-concrete interface under the action of various loads, can accurately capture the critical point of interface shear stress and friction failure, can accurately simulate the nonlinear change rule of the equivalent stiffness of the composite beam along with the loads by adopting different stiffness calculation formulas, and meanwhile, the design method systematically considers multiple influence factors, and the design method is simple and convenient. According to the method, the nonlinear mechanism of a bolt connection area is simulated, a relatively accurate displacement value can be given, economic evaluation is considered, and the method is a relatively comprehensive composite beam design analysis method.

The utility model provides an inter-beam connecting structure for a steel and concrete composite beam, which comprises a composite beam, the composite beam comprises a bridge deck slab and a composite rib plate positioned on the bottom surface of the bridge deck slab, the butt joint end of the bridge deck slab is provided with a first bridge deck post-pouring area, and the butt joint end face of the bridge deck slab is provided with a connecting plate II in the range of the first bridge deck post-pouring area; the second connecting plates of every two adjacent composite beams are connected through second bolt assemblies, and after connection is completed, UHPC concrete is poured into the first bridge floor post-pouring area; the combined rib plates of every two adjacent combined beams are connected in a rigid connection mode. The two second connecting plates are connected through bolts, concrete is poured into the first bridge deck post-pouring area after bolt connection, the connecting integrity between the bridge deck slabs is good, and meanwhile the situation that heat is generated by welding between the second connecting plates, and connection between the second connecting plates and the bridge deck slabs is affected is avoided.

The invention discloses a steel-UHPC (Ultra High Performance Concrete) combined bridge deck slab composite beam segment total assembly automatic welding method, which relates to the technical field of bridge construction in fixed buildings, and comprises the following steps: S1, positioning a central flat bottom plate unit, fixing the central flat bottom plate unit with a jig frame, then positioning and assembling flat bottom plate units on two sides, and finally assembling an inclined bottom plate unit to form a bottom plate unit; s2, assembling a middle partition plate unit on the bottom plate unit, temporarily supporting the middle partition plate unit, then positioning a middle web plate unit, and finally welding the middle web plate unit, the middle partition plate unit and the bottom plate unit; s3, the side partition plate units and the side web plate units are sequentially spliced on the inclined bottom plate units, and then the side partition plate units, the side web plate units and the inclined bottom plate units are welded; s4, the side top plate units and the anchor web plate units are positioned and welded; and S5, bridge deck prefabricated slabs are assembled, and then positioning, welding and fixing are conducted. The invention further discloses the technical problems that the labor intensity is high and the quality stability is poor during production of the steel-UHPC composite bridge deck slab composite beam.

The invention relates to the field of computer aided design, in particular to a modular design method and system for a corrugated steel web composite beam bridge. The invention discloses a modular design system for a corrugated steel web composite beam bridge. Comprising a corrugated steel web composite girder bridge demand data set construction module, a population set construction module, a fitness calculation module, a population set iteration updating module, an optimal corrugated steel web composite girder bridge design parameter set output module and a corrugated steel web composite girder bridge modular design module. According to the method, the design parameters of the corrugated steel web composite girder bridge are simulated and generated through a genetic algorithm, so that automatic modular design of the corrugated steel web composite girder bridge is completed; and a corresponding parameter variation probability value is set for each corrugated steel web composite beam bridge simulation design parameter, and the parameter variation probability value can be adaptively adjusted according to an iteration process, so that the calculation amount consumption in the middle and later periods of iteration is reduced, and the convergence speed in the middle and later periods of iteration is improved.

The invention relates to the technical field of batteries, and discloses a composite beam, a battery pack lower shell and a battery pack. The composite beam comprises a main material made of a composite material and an auxiliary material made of a metal material. The main material is provided with at least one first cavity, and the first cavity penetrates through the main material in the length direction of the main material; the composite material is arranged in the first cavity, and the auxiliary material is fixedly connected with the main material. The composite material beam provided by the invention comprises the main material and the auxiliary material, the mode of combining the composite material and metal is adopted, the composite material beam not only has the advantages of light weight, low cost, high stability, good insulativity and good corrosion resistance of the composite material, but also has the strength of the metal material due to the fact that the auxiliary material made of the metal material is arranged in the first cavity of the main material; and the auxiliary material can make up the weft-wise strength of the pure composite beam, so that the composite beam has better comprehensive performance, and the product has higher competitiveness.

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 discloses a steel-concrete composite beam structure assembled by hot-rolled section steel and a construction method of the steel-concrete composite beam structure. The composite beam structure comprises two pieces of H-shaped section steel; 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 and the construction method thereof, the steel-concrete composite beam can be formed by directly assembling the hot-rolled section steel products on site, the steel structure machining and manufacturing links are avoided, welding, formwork installation and 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 invention relates to the technical field of bridge deck slab connecting piece structures, in particular to a composite beam prefabricated concrete bridge deck slab connecting piece structure. According to the technical scheme, the bridge deck comprises a first concrete bridge deck body and a second concrete bridge deck body, and the ends, close to each other, of the first concrete bridge deck body and the second concrete bridge deck body are provided with pouring connecting grooves and connecting pieces correspondingly; the ends, away from each other, of the first concrete bridge deck and the second concrete bridge deck are provided with connecting pieces and pouring connecting grooves correspondingly. During connection construction, the multiple sets of reinforcing ribs are inserted into the multiple sets of through openings correspondingly, concrete grout can be injected into the pouring connection grooves when the concrete bridge deck slabs are connected, the concrete grout enters the inner grooves in the inner sides of the through openings through the pouring openings, and the reinforcing ribs are more firmly fixed into the inner grooves; the edge locking pieces and the edge groove assemblies are arranged at the two ends of the adjacent first concrete bridge deck slab and the second concrete bridge deck slab, so that the concrete bridge deck slabs can be effectively prevented from cracking to generate gaps.

The invention relates to a space curve prestress composite beam column and a design method thereof. The bottom of the space curve composite beam column is vertically upward, the tail end overhanging part is approximately horizontal, and the middle part is connected with the horizontal prestressed concrete closed beam to form a space structure. The horizontal closed prestressed beam and the space curve composite beam column support each other, the constraint boundary condition of the space curve composite beam column is changed, and the internal force distribution and magnitude of the space curve composite beam column are changed. According to the space curve composite beam column with the horizontal closed prestressed beam, the anti-cracking and anti-bending performance of a component is improved, and the deformation performance of the component is also improved. Therefore, the structure is particularly suitable for large cantilever structures with high deformation and bearing capacity.

The invention discloses a frame column and superposed beam connecting joint and a construction method thereof. The novel connecting joint mainly comprises a superposed beam, a frame column, a connecting cover plate and a post-pouring part. The frame column comprises a steel pipe column and a steel pipe concrete column, the composite beam is placed on a lower connecting ring plate of the steel pipe column, a composite beam bottom embedded steel plate is connected with the column lower connecting ring plate in a welded mode, and a composite beam top embedded steel plate is connected with a steel column upper connecting ring plate or a steel column wall plate in a welded mode through a connecting cover plate. And concrete, ultra-high performance concrete or grouting materials are poured into gaps between the superposed beam ends and the steel columns to form a whole. Compared with the prior art, reliable force transmission of the beam top rib and the bottom rib in a joint area is achieved through welded connection of the superposed beam embedded steel plate and the frame column, machining and construction links such as steel pipe column wall trepanning, reinforcement and beam top rib penetrating are effectively reduced, the technology is simplified, and efficiency is improved. The connecting joint of the frame column and the superposed beam is clear in force transmission path, simple in structure and convenient to construct, and has performance and construction advantages.

The invention discloses a variable cross-section continuous composite beam bending moment and displacement calculation method. The method comprises the following steps: S1, segmenting a variable cross-section continuous composite beam structure; s2, calculating anti-bending inertia moments of combined sections of different beam sections, and segmenting the variable-section continuous combined beam according to the anti-bending inertia moments of the sections to obtain a segmented uniform-section model; s3, geometric morphology equivalence is conducted on the variable-cross-section continuous composite beam according to a segmented uniform-cross-section model, half span is selected through symmetry to conduct theoretical analysis calculation, and the bending moment Mr at the segment point of the equivalent model section is obtained; s4, determining an actual inflection point position, and according to the actual inflection point position, performing further equivalent segmentation on the variable cross-section continuous composite beam; and S5, dividing the half-span variable cross-section continuous composite beam into three sections according to the positions of the cross-section segmentation points and the actual inflection points, establishing an equation based on the stress balance and deformation coordination relationship of the cross-section segmentation points and the actual inflection points, and providing a typical cross-section displacement, corner and bending moment calculation method.

The invention discloses a composite beam capable of enhancing the ultimate strength of an ultimate concrete structure. The span of the beam is measured, a bending moment graph of the beam is drawn, according to analysis of the bending moment graph, UHPC is selected for a pure bending section (the middle of the span) above a neutral axis of the beam, the upper half part of the beam is covered, and common concrete is used for the rest parts; half of the beam height is selected to use UHPC on the upper portion, and the structural ultimate strength of the composite beam can be improved; the FRP rib is used on the lower portion of the beam, the tensile property and ductility of the lower portion can be improved, a sleeve grouting anchorage device (the inner wall of a metal sleeve is provided with threads) and a wedge-shaped anchorage device (the clamping section is wrapped with a copper sleeve) are adopted, the anchoring reliability is ensured through the double effects of chemical bonding and mechanical meshing, and due to the fact that the FRP rib can be subjected to brittle failure and is preset to be in a super rib failure mode, the tensile strength and ductility of the lower portion can be improved. The problem of brittle failure of the FRP rib is solved. The beam is simple in design, convenient to construct, reasonable in stress, high in structural ultimate strength, high in reliability, wide in application range and material-saving.

The invention provides a pier top connecting structure of a composite structure bridge based on steel and concrete and a construction method. A cross beam pouring area is formed between the ends of every two adjacent standard simply-supported units, and end steel plates, second shear nails, second tooth keys and fourth bridge floor post-pouring areas are arranged on composite beams participating in butt joint in the standard simply-supported units; a plurality of second tooth keys are arranged on the end face, close to the cross beam pouring area, of the concrete rib plate, a fourth bridge deck post-pouring area is located at the end, close to the cross beam pouring area, of the bridge deck slab, an end steel plate is arranged at the end, close to the cross beam pouring area, of the steel beam, and a plurality of second shear nails are arranged on the face, away from the steel beam, of the end steel plate; reinforcing steel bars are arranged in the cross beam pouring area and the fourth bridge floor post-pouring areas of the two adjacent standard simply-supported units, and concrete is poured together in the cross beam pouring area to form a connecting cross beam. The problem that a traditional simply-supported variable continuous structure cannot adapt to system conversion between composite beams in a multi-material composite web form is solved.