140 results about "Beam cross section" patented technology

The invention relates to the technical field of section design, and discloses a shipyard steel bent frame column and beam section design simulation method and system. The method comprises the following steps: classifying and storing the historical data of the shipyard steel bent, establishing an experience library and extracting initial section parameters; inputting a parametric modeling system to generate a geometric model and a load condition; obtaining an internal force envelope value based on finite element analysis; obtaining a stress ratio and a displacement ratio according to standard combination and checking calculation; using an NSGA-II algorithm to optimize section parameters; and modeling and marking based on an optimization result, and generating a structure optimization scheme and a design drawing. The problems that in the prior art, preliminary section type selection of a steel bent frame structure lacks system optimization, a large amount of manual adjustment is needed in the design process, the overall design efficiency is low, and the material utilization rate is low are effectively solved, and automatic, refined and multi-target comprehensive optimization of steel bent frame column and beam section design is achieved.

The invention discloses a cable-stayed bridge cross brace optimization system based on system reliability and an intelligent algorithm, which relates to the technical field of bridge engineering, and comprises a multi-source parameter input module used for collecting and processing data such as a main beam section, stay cable parameters, a strain sequence, a vibration sequence, a satellite cloud picture, a traffic monitoring flow, laser point cloud and the like; and outputting the structured design data, the monitoring data flow, the dynamic load spectrum, the probability distribution model and the construction error correction parameters. According to the invention, all-dimensional data such as design, monitoring, load, materials and construction errors are integrated through the multi-source parameter input module, and multi-level and dynamic reliability evaluation is carried out on the component, the subsystem and the system level by using the system reliability analysis module, so that the component failure probability, the system reliability index time sequence and the like can be output; therefore, the real reliability level of the cross brace of the cable-stayed bridge in the whole life cycle is reflected more accurately, and the one-sidedness of a traditional method is avoided.

The claimed invention discloses a catapult launcher for a fixed-wing unmanned aerial vehicle (UAV), the launcher comprises a starting rail having an I-beam cross-section that comprises two sections that are foldable / unfoldable and mounted on adjustable supports, a carriage that is equipped with wheels that are configured to interact with an internal surface and with an external surface of the starting rail and that is equipped with a UAV interaction mechanism that is represented by fasteners and joint elements that interact with adapters that are fixed to a UAV's fuselage and made in a form of two plates, and a lower edge of the plates is produced with grooves so as to enable interaction with the fasteners and with detents in a form of hooks that are tangent to joint elements. The launcher is equipped with elastic cords that are symmetrically arranged along the starting rail and fixed to the carriage and to the starting rail, and with a release device. A beginning of the starting rail is provided with an inclined section, and the release device joins to the carriage on the inclined section and the carriage to the UAV, their reliable fixation and start of the carriage movement upon activation of the release device. This configuration ensures reliability and portability of the launcher as well as a safe UAV launch at a short acceleration distance.

The invention provides an integrated measurement device, a beam parameter quality control method and related equipment, relates to the technical field of particle radiotherapy, and is used for rapidly measuring beam parameters of pencil beam scanning points in arc proton therapy in real time. Comprising a plurality of measurement units which are arranged at intervals along a beam transmission direction, the plurality of measurement units are periodically and repeatedly arranged to form a two-dimensional orthogonal sampling grid, and time-space distribution data of a beam cross section are synchronously acquired through one-time beam output; the analysis module is used for processing the beam parameters output by the signal acquisition and processing module in real time, and the beam parameters comprise the scanning point position, the beam spot size, the charge quantity and the range; beam parameters of a pencil beam scanning point can be rapidly measured in real time, and accurate and efficient measurement is ensured; according to the matched beam parameter quality control method, the accuracy and reliability of arc proton treatment are improved through operations such as multi-angle measurement, parameter correction, quality control interval optimization and real-time dynamic adjustment.

The embodiment of the invention provides a shipyard steel framed bent scheme automatic optimization method and system. The method is applied to the technical field of buildings and comprises the following steps: selecting an initial size of a shipyard steel bent column beam section and bent design information based on engineering experience library data, and constructing high-precision input characteristics based on factory design information; based on the high-precision input features, constructing a physical constraint graph neural network, and predicting an initial design scheme meeting the physical constraint; and carrying out multi-objective reinforcement learning optimization on the initial design scheme meeting the physical constraint, and carrying out dynamic adjustment in a virtual simulation environment to obtain optimized steel bent design parameters. In this way, according to the method, the shipyard data are monitored in real time, the graph neural network is constructed for feature extraction and parameter optimization, the optimal steel frame parameters are obtained in dynamic adjustment, and the practical value is high.

The invention discloses a steel-wood composite structure joint construction method, which belongs to the technical field of laminated wood bar planting, and comprises the following steps: forming a plurality of bar planting holes in a wood arched beam in a finish machining manner in a factory; after the reinforcing steel bars are pretreated, steel limiting pins are welded to the two ends of the reinforcing steel bars; glue is injected into the glue injection holes in the two sides of the steel bar planting hole at the same time, the wood arched girders are tightly jacked towards the inner side after glue injection is completed, pressing force is provided, and it is guaranteed that the multiple wood arched girders are tightly connected. By means of the mode, the steel-wood joints are fixed through the temporary pin shafts, the number of the pin shafts is half of the total number of the bolt holes, the bolt holes are adopted for positioning, the joints are fixed after all the bolt holes are aligned, and the joint installation precision is guaranteed; staggered trepanning at different heights is carried out on the cross section of the wood arched beam, so that weakening of trepanning on the wood cross section is reduced; steel limiters are welded to the ends of the steel bar beams to ensure that the steel bars are located in the centers of the steel bar planting holes, and uniform flowing of steel bar planting glue in the hole channels is kept while the steel bar planting hole channels are not blocked.

The invention discloses a cooperative control method for stay cable force and main beam line shape of an extradosed cable-stayed bridge. The cooperative control method comprises the steps that cable force data, main beam line shape data and main beam section internal force monitoring data in the construction stage are collected; based on a preset cable force adjustment judgment criterion, whether cable force adjustment needs to be started or not is judged; when triggering conditions are met, a geometric nonlinear analysis model considering cable-beam-tower cooperative deformation is established, and a cable force-main beam line shape sensitivity influence matrix is generated; screening K stay cables as key adjustment objects by adopting an influence matrix column vector L2 norm sorting method, and performing global optimization based on a simulated annealing algorithm to obtain an optimal displacement mean square error and an optimal cable force adjustment amount; and according to the key adjustment object and the cable force adjustment amount, multi-cable synchronous grading tensioning work is carried out. The invention provides a systematic and intelligent solution for the construction control of the extradosed cable-stayed bridge, and has remarkable economic benefits and social benefits.

The invention belongs to the technical field of building assistive devices, and particularly relates to a large-span steel structure truss high-altitude roller sliding device which comprises a supporting mechanism, a clamping mechanism, a moving mechanism and an auxiliary mechanism. The supporting mechanism comprises a cross beam, the cross section of the cross beam is of an I-shaped structure, and beam grooves are symmetrically formed in the two sides of the cross beam in the length direction of the cross beam. And the clamping mechanism is mounted above the cross beam and is used for fixing and dismounting the truss. A spline rod is in sliding fit with a spline sleeve, the distance between a movable frame and a fixed frame is adjusted in combination with a second self-locking threaded rod, and cross beams with different thicknesses are adapted; in the auxiliary moving assembly, a second double-end self-locking screw drives a sliding block, a linkage movable rod and an auxiliary wheel to adjust the distance, beam grooves with different depths are adapted, the auxiliary wheel forms track constraint, and the auxiliary moving assembly can be rapidly installed on different supporting mechanisms within a certain range.

The invention discloses a bridge section temperature field calculation method fusing infrared imaging and finite element analysis, and belongs to the technical field of bridge temperature measurement. According to the method, unmanned aerial vehicle acquisition equipment with an infrared lens is used for performing surface infrared temperature image acquisition on upper, lower, left and right sections of a to-be-measured cross section of a bridge at multiple moments; spatial mapping of temperature information is realized through format conversion and temperature information extraction of the infrared image; on the basis of a finite element analysis platform, the extracted surface temperature data are imported into a bridge cross section numerical model, temperature field distribution solving is carried out through a solid heat transfer and stress analysis function, and accurate reconstruction and temperature effect analysis of a bridge cross section temperature field are achieved. According to the invention, non-contact rapid monitoring and accurate calculation of the bridge temperature field are realized, and reliable technical support is provided for health assessment of a bridge structure.

The invention discloses an existing concrete beam bridge crack diagnosis method based on an influence line sparse coefficient, which is characterized in that force method graph multiplication and a crack nonlinear damage function are substituted into an analytical solution for solving, and finite element simulation relates to respiration crack simulation. A nonlinear spring is adopted to simulate crack opening and perform grid division and encryption processing on the tip of the crack, bridge section rigidity change caused by the breathing crack is accurately simulated by constructing a crack rigidity damage function, and the model is introduced into an influence line analytical solution to obtain a nonlinear influence line of the cracked bridge. In combination with a sparse coefficient representation method, damage position and damage degree information is extracted from influence line data, and accurate positioning and quantitative evaluation of beam bridge section cracking are achieved; the method not only improves the accuracy and efficiency of damage identification, but also provides a reliable technical means for rapid detection and state evaluation of the existing beam bridge.

This utility model provides a main beam cross-section structure for a long-span, low-tower cable-stayed bridge, relating to the technical field of main beam cross-section structures. It includes a pier body and a top panel. The pier body has an internally reinforced rib structure, and a cap beam is provided on the upper part of the pier body. A first recess is opened in the middle of the cap beam, and a central insert is installed within the first recess. Positioning holes are provided on both the left and right sides of the cap beam, and positioning columns are embedded within these holes. The upper parts of the central insert and positioning columns are fitted into the lower part of the top panel, and two sets of supports are installed between the bottom surface of the top panel and the cap beam. This utility model not only ensures precise alignment and stability of the bridge's central portion, contributing to the stability of the main beam core, but also effectively resists tensile stresses, significantly improving the bridge structure's bending resistance, making it more stable and robust, preventing the generation and development of cracks, and extending the bridge's service life.

The present invention relates to the technical field of wheel-rail double-disc rolling simulation, and specifically discloses a double-disc rolling rail specimen design method that takes into account the effect of bending stress. The present invention realizes the effect of bending stress on the extension of rail rolling contact fatigue cracks on the double-disc rolling specimen, and combines finite element analysis methods and rolling contact fatigue and wear testing machines, SEM scanning electron microscopes and other equipment to analyze the cross-sectional crack morphology and maximum bending stress value σ of the double-disc rolling rail specimen. simRmax The cross-sectional shapes of the specimens are optimized according to the analysis results until the crack morphology of the specimen cross section is close to the crack morphology of the rail cross section after field service, and the total height H of the simulated beam cross section of the specimen is continuously modified until it meets σ simRmax =σ Rmax , and then combined with the rolling contact fatigue and wear testing machine to verify the rationality of the test structure again, to ensure that the rolling contact fatigue crack damage of the full-size rail under bending stress can be reproduced in the laboratory.

The utility model discloses a multi-module collaborative laser green repair metal remanufacturing device, and belongs to the technical field of laser processing. The multi-module collaborative laser green repair metal remanufacturing device comprises a supporting frame and a gas cylinder, a rotating disc is arranged on the supporting frame, various scraper assemblies are arranged on the rotating disc, a connecting frame is arranged at the top of the supporting frame, a shell is arranged at the other end of the connecting frame, and a powder conveying assembly is arranged in the shell. A powder storage tank communicated with the gas cylinder is arranged on the top of the shell, and a laser is arranged on the back of the supporting frame. According to the multi-module collaborative laser green repair metal remanufacturing device, after powder in the powder storage tank is extruded out and conveyed to the base plate through the powder conveying assembly, the various scraper assemblies are rotated according to the green repair layer morphology requirement, the cross section morphology of a powder beam of the scraper assemblies meets the green repair requirement, and finally the laser carries out laser green repair forming. The problems that due to the irregular powder distribution form, the surface of the green repairing layer is hollow, and the precision of a formed part is poor are solved.

The invention discloses an arch dam shear-resistant safety evaluation method, which specifically comprises the following steps of: establishing an arch dam numerical model through ADAO software, calculating shear-resistant safety coefficients of each arch section and beam section of a dam body, and identifying and positioning the most unfavorable arch section and the most unfavorable beam section according to the shear-resistant safety coefficients; constructing an agent model by combining Latin hypercube sampling and a BP neural network method; calculating an arch dam shear resistance reliable index based on a Monte Carlo simulation method; according to the arch dam anti-shear safety evaluation method, the arch dam anti-shear safety problem is focused, the anti-shear safety level of the weakest area of the arch dam is quantitatively evaluated, the gap of arch dam anti-shear safety evaluation is filled up, anti-shear safety is accurately quantified, a scientific and efficient path is provided for arch dam engineering anti-shear safety evaluation, and through A arch dam example verification, the arch dam anti-shear safety evaluation method has the advantages that the arch dam anti-shear safety evaluation method is high in practicability. And the arch dam operation safety is effectively guaranteed.

The invention relates to the technical field of accelerator beam calibration, in particular to an electron accelerator beam calibration water absorption target device which comprises a suspension support, an installation platform is arranged at one end of the suspension support, and a calibration target is detachably installed on the installation platform; the calibration target comprises a detachable water tank mounted on the platform, the water tank is filled with a liquid medium for absorbing beam energy, and no bubble exists in the water tank; the water tank is horizontally arranged along the beam propagation direction of the electron accelerator, and the cross section is perpendicular to the beam incidence direction; according to the invention, the regular hexagonal honeycomb array measurement subareas are formed in the water tank through the thermal insulation partition plates, the regular hexagonal honeycomb array measurement subareas are further refined into the independent spacer areas in cooperation with the net-shaped partitions, and the regular hexagonal densely-laid structure has no measurement blind area and can completely cover the cross section of a beam; meanwhile, the side lengths and the volumes of all the partitions are consistent, and the standard unification of all the measuring units is ensured.

The application relates to the technical field of building construction, in particular to a structure reserved hole cantilever plate reinforcing construction method.The method comprises the following steps of S1, obtaining structure plate horizontal reserved hole related parameters; S2, establishing a BIM model according to the obtained structure plate horizontal reserved hole related parameters; S3, determining the reserved hole position and size according to the established BIM model; and S4, determining the added structure beam section model by using stress software according to the reserved hole position and size; the PKPM software is used for component stress calculation and analysis, the support steel beam structure deformation and safety analysis are designed, and the scheme safety and accuracy are guaranteed. The added structure beam structure system greatly reduces the construction cost caused by full-support scaffold measures.

The invention discloses a beam wall column section size generation method, system and device and a medium, and the method comprises the steps: constructing a design specification knowledge graph of a beam wall column section according to various building structure design specification files; obtaining an initial size of a target beam section and an initial size of a target wall column section; generating a second size of the target wall column section according to the design specification knowledge graph of the wall column section and the initial size of the target wall column section; generating a second size of the beam section according to the design specification knowledge graph of the beam section and the initial size of the target beam section; and according to the second size of the target wall column section and the second size of the target beam section, generating the size of the target beam wall column section. Through the automatic and intelligent section design technology, the problems that a traditional method is low in efficiency and unstable in economical efficiency are solved, on the premise that the structure safety is guaranteed, the design efficiency, economical efficiency and compliance are comprehensively improved, and the method has remarkable engineering application value and market popularization prospects.

A wave-shaped web I-beam front axle, including I-beam and the front axle body arranged at both ends of the I-beam, the front axle body extends obliquely outward and is provided with a front axle pipe, the I-beam includes horizontal upper web and lower web, the upper web and the lower web are fixedly connected by vertical middle web, so that the upper web, the middle web and the lower web form the I-beam with I-shaped cross section, and the horizontal section of the middle web is wave-shaped.The utility model discloses more reasonable structure design, through reducing the thickness of the upper web of the I-beam, the width of the upper web and the lower web of the I-beam and the thickness of the middle web, the relative circular pipe beam cross section area reduces 29.5%, realizes that the I-beam front axle reduces 12.5% in weight, in addition, the cross section height of the I-beam is higher than that of the circular pipe beam, improves the bending fatigue strength of the front axle, the middle web is designed into wave-shaped, improves the bending deformation stiffness of the front axle, namely, in the whole weight reduction, the bending resistance of the front axle can be improved.

The present invention discloses a bracket design method for supporting and isolating a tunnel axial flow fan, comprising: (a) using a double I-beam cantilever beam as a support structure installed on the tunnel side wall to support the tunnel axial flow fan; (b) obtaining parameters related to the axial flow fan, including mass, speed, installation position, and vibration isolation efficiency; (c) ignoring the deadweight of the cantilever beam, and calculating the moment of inertia I of the cross section of the cantilever beam according to the parameters in step (2) z (d) Based on the vibration isolation efficiency and the moment of inertia of the cantilever beam cross section I z , using the I-beam model table to determine the I-beam model; and (e) analyzing the maximum normal stress and maximum shear stress of the double I-beam cantilever beam, and comparing the maximum normal stress with the tensile proportional limit and yield limit of the cantilever beam material to ensure that the maximum normal stress does not exceed the tensile proportional limit and yield limit of the cantilever beam material.

The application discloses a high-efficiency lacing construction of a laminated beam section and a construction method thereof. For the laminated beam with a common section width of 400-800 mm in engineering, different numbers of composite stirrups are combined, and the hook forms and positions of the stirrups are changed to facilitate efficient lacing. Compared with the prior art, the application solves the problem of collision between the 135-degree hook of the traditional stirrup and the longitudinal reinforcement by optimizing the stirrup construction form of the laminated beam section, increases the operation space for lacing the top reinforcement of the laminated beam, reduces the construction difficulty, and effectively improves the on-site construction efficiency of the laminated beam. The lacing construction of the laminated beam section solves the construction pain point of the difficulty in lacing the laminated beam of the existing fabricated frame structure, can avoid the quality problems caused by the difficulty in lacing the stirrup on site, guarantees the safety of the structure, and meanwhile, the optimized composite stirrup construction of the laminated beam is simple, convenient to produce, and can realize efficient processing and efficient construction.

The invention relates to the field of frames, in particular to a sectional type auxiliary frame assembly and a snow sweeper with the same, and the sectional type auxiliary frame assembly comprises a front section auxiliary frame assembly and a rear section auxiliary frame assembly; the front-section auxiliary frame assembly and the rear-section auxiliary frame assembly are respectively mounted on a chassis of the vehicle body; the auxiliary frame assembly disclosed by the invention adopts a sectional structure, is mounted on a traditional chassis, and can be suitable for a multi-platform chassis; a traditional auxiliary frame structure can be optimized according to the stress characteristics of loading and bearing of the snow sweeper, an integral auxiliary frame assembly with the same section is changed into a front section and a rear section, the section of a longitudinal beam of the front section of the auxiliary frame is reduced, and the section of a longitudinal beam of the rear section of the auxiliary frame is kept unchanged; and the weight of different parts of the upper part is borne, so that the auxiliary frame is stressed more reasonably. Meanwhile, the weight of the auxiliary frame can be reduced, and the advantage of light weight is achieved.

The invention relates to a sliding beam design method considering rail collaborative stress, and aims to solve the technical problems that in traditional sliding construction, the rail effect is ignored, the sliding shoe counter-force non-uniform control standard is lacked, and the design construction process is fuzzy. According to the method, uniform counter-force of a sliding shoe is obtained through finite element analysis, and the sliding beam section and a supporting system are optimized in combination with multi-working-condition trial calculation; a sliding shoe counter-force non-uniform control standard is formulated based on the actually measured elevation difference and the theoretical deflection; carrying out shear resistance (Vtotal = Vslippage beam + Vtrack) and bending resistance checking calculation on the combined section of the slippage beam and the track, and quantifying the stress contribution of the track; and finally, fillet weld connection and clamp plate construction are adopted. Cooperative work of the track and the sliding beam is achieved. The method is suitable for slippage projects such as long-span bridges and venue roofs, the structural safety and the construction reliability can be remarkably improved, the rework cost is reduced, and the method has high engineering application value.

The utility model relates to a shearing force connecting structure of a corrugated steel web box girder, and belongs to the technical field of bridge engineering. The angle steel is vertically embedded into the concrete slab and is welded with the corrugated steel web; the embedded part of the angle steel is respectively provided with three open holes which are respectively convenient for the perforated steel bars to pass through; the first perforated reinforcements are parallel to the length direction of the corrugated steel web, and the second perforated reinforcements are perpendicular to the first perforated reinforcements. The multiple pieces of angle steel are sequentially arranged in the length direction of the corrugated steel web and sequentially arranged at the bottom of each groove of the corrugated steel web according to the alternating rule, and the same first perforated steel bar penetrates through the multiple first open holes. The connecting structure has interface shear resistance and web root bending resistance and torsion resistance, and the rigidity and strength of the roots of the corrugated steel webs under the action of distortion and torsion are improved while shear resistance connection is achieved; and on the premise of ensuring the shear stiffness, the deformation of the steel-concrete junction of the cross section of the box girder under the action of eccentric load and the like can be better adapted.

The application is a beam formwork support merging arrangement method, electronic equipment and storage medium; the method comprises the following steps: establishing a database; counting all beam section types of design drawings, obtaining beam section data D and beam formwork support height H in all drawings; judging whether there is an out-of-range beam section, if there is, moving out the type of out-of-range section for separate calculation; selecting support type and erection mode; setting beam section merging grouping fineness; merging and grouping the beam section; judging whether the merged and grouped beam section meets the requirements; searching the database according to the grouping and merging results to form an erection scheme and calculation book. The application realizes fast merging and searching of the beam formwork support scheme, takes into account safety and economy, effectively improves the preparation efficiency, reduces human errors, and adapts to different engineering requirements.

The invention discloses a method for establishing a temperature gradient of a double-layer steel truss girder under solar radiation, which comprises the following steps of: S1, calculating a solar elevation angle alpha s (t) and a solar azimuth angle gamma (t) according to the latitude and longitude of a bridge site, an hour angle and a solar declination; projecting the solar ray vector to the cross section of the main beam according to the included angle xi between the axis of the main beam and the east-west direction to obtain a solar incident angle theta (t) in the cross section; s2, respectively deducing solar radiation areas of an upper-layer bridge floor, a lower-layer bridge floor and web members on the basis of a solar incident angle theta (t) and geometric parameters of the bridge; s3, establishing a temperature field formula related to the solar radiation duration, the air temperature, the material attribute, the surface direction and the coating; s4, temperature gradients of the upper-layer bridge floor, the lower-layer bridge floor and the web members are calculated according to the solar radiation area and a temperature field formula, and the most unfavorable temperature gradient and the corresponding moment are determined; according to the scheme, a reliable temperature working condition basis is provided for temperature effect analysis, stress evaluation and structural design of the double-layer steel truss girder.

The application discloses a steel frame structure anti-seismic optimization method based on a particle swarm algorithm, and relates to the technical field of building anti-seismic, and comprises the following steps: acquiring geometric constraint data for a target beam; generating corresponding mechanical compensation parameters based on the geometric constraint data; managing state identifiers of a plurality of particle data in a particle swarm optimization engine through a coordination controller based on the mechanical compensation parameters; adjusting at least one of a constraint condition pool and a particle generation strategy of the particle swarm optimization engine based on a check result of the state identifiers, and outputting a steel frame structure anti-seismic optimization design scheme satisfying a strong-column weak-beam anti-seismic mechanism and geometric constraints; and the application ensures that only a scheme satisfying the mechanical compensation parameters can be adopted, thereby avoiding failure of the strong-column weak-beam mechanism caused by reduction of the section height of the target beam, and improving the safety of the target design scheme.

The utility model relates to a printer wallboard straining beam section processor, and belongs to the technical field of printer wallboard straining beams, the printer wallboard straining beam section processor comprises a base, a support frame arranged at the upper end of the base and a U-shaped seat arranged in the middle of the upper end of the base, hydraulic push rods I are arranged on the front side and the rear side of the U-shaped seat, and clamping blocks located in the U-shaped seat are arranged at the push rod positions of the hydraulic push rods I; the upper end of the base is provided with guide rail grooves located in the left side and the right side of the U-shaped base respectively, lateral clamping plates slide in the guide rail grooves, and the base is provided with a driving assembly for driving the lateral clamping plates to move oppositely and reversely. Compared with the prior art, the printing machine wallboard straining beam section processor has the advantages that under the protection effect, the driving motor drives the grinding disc to rotate, the sections of the two ends of a straining beam are automatically and synchronously processed, meanwhile, chippings are prevented from splashing, a blocking cylinder blocks the chippings and prevents the chippings from being discharged, meanwhile, the dust collection assembly extracts the generated chippings, and the working efficiency is improved. The treatment efficiency, the safety and the environmental protection effect are improved.

The invention discloses a large-span glass curtain wall system which comprises a main body structure, glass panels, transverse steel beams, inhaul cables, bearing steel plates and inhaul cable fasteners. Wherein the transverse steel beams are arranged in parallel at horizontal dividing joints of the glass curtain wall between top and bottom main body structure beams, two ends of the transverse steel beams are fixedly connected with main body structure columns respectively, and the transverse steel beams are used for transmitting horizontal load of the glass curtain wall to the main body structure columns; the inhaul cable is arranged at the vertical dividing joint of the glass curtain wall in a hidden mode, one end of the inhaul cable is fixedly connected with the top main body structural beam, and the other end of the inhaul cable sequentially penetrates through the inhaul cable holes in the second bearing steel plate to be fixedly connected with the bottommost transverse steel beam and is used for bearing the gravity load of the glass curtain wall. The transverse steel beams and the inhaul cable system are combined, and the problem that the section of the main body beam is designed to be too large due to too large prestress can be solved.

The utility model discloses a mobile crossbeam for universal testing machine belongs to universal testing machine technical field, mobile crossbeam section is square, hollow inside, and the middle part of mobile crossbeam is equipped with the through -hole for the installation of clamp, and the inside of mobile crossbeam is equipped with two strength support device symmetrical in the through -hole left and right sides, and strength support device includes the resin concrete column of supporting the inside surface of mobile crossbeam up and down and is located in the resin concrete column several longitudinal distribution's prestressed steel, and the both ends of prestressed steel are curved to the outside of mobile crossbeam, and resin concrete column is with mobile crossbeam interference fit. In addition, the utility model still provides the manufacturing and installation method of above -mentioned strength support device. The utility model improves mobile crossbeam rigidity through the structure improvement, avoids the micro deformation of mobile crossbeam in the test process because of the clamp pressure through the inside strength support device, improves mobile crossbeam service life and test accuracy.

The invention discloses a construction method for reducing the local section of an existing structural beam. The construction method comprises the following steps that S1, a cuboid beam section reducing area is divided at the bottom of the existing structural beam; a cuboid concrete removing area is divided at the bottom of the existing structural beam; s2, concrete in the concrete removing area is removed, and existing steel bars in the structural beam are exposed; s3, existing bottom ribs and existing stirrups in the area with the reduced beam section are cut off; s4, newly-added bottom bars are installed at the bottom of the post-pouring concrete area; and S5, concrete construction is conducted in the post-pouring concrete area, and construction for reducing the local section of the structural beam is completed after concrete is formed. According to the method, reliable connection is provided between the post-pouring concrete area and the existing structure by arranging the newly-added bottom bars in the post-pouring concrete area, so that the stress performance of the beam meets the requirements after local dismantling, the situation that the whole beam is constructed again after being completely dismantled is avoided, and the construction efficiency is improved.