381 results about "Flexural rigidity" patented technology

The present invention provides an embossed multi-ply tissue product that is visually pleasing and has improved physical attributes. For example, the inventive multi-ply tissue products have reduced stiffness, such as a GM Flexural Rigidity less than about 600 mg*cm, improved absorbency, such as a Residual Water (WResidual) value less than about 0.15 g, and improved wet resiliency, such as a wet elastic strain ratio greater than about 32 percent.

The invention discloses a rigid rod frequency ratio method axial force identification method. The method comprises the following steps: (1) according to engineering data, obtaining whether a rigid rod is a pressure rod or a pull rod, and obtaining related parameters of the rigid rod: the linear density m of the rigid rod, the length L of the rigid rod and the flexural rigidity EI of the rigid rod; (2) vibration signals of the rigid rod are collected on site through a vibration sensor, and multi-order frequency of the rigid rod is obtained through analysis; (3) selecting a corresponding method to calculate the frequency ratio of the rigid rod according to whether the rigid rod is a compression rod or a pull rod and boundary conditions, and calculating the axial force of the rigid rod through a frequency ratio method; and (4) checking the relative flexural rigidity xi of the rigid rod, and evaluating the axial force identification precision of the rigid rod. According to the method, a unified calculation method for identifying the axial force of the rigid pull rod and the pressing rod is established through a frequency ratio method, the method is easy to use and has good precision, and a practical new method is provided for identifying the axial force of the rigid rod.

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 discloses a deep learning-based deformation calculation method for a shield under-crossing existing tunnel structure, and belongs to the technical field of tunnel engineering pile foundation underpinning. The method comprises the following steps: establishing a deep learning prediction model to obtain ground surface settlement caused by a new shield tunnel; the stratum loss rate is obtained through inversion according to a Loganthan-Poulos ground surface settlement analysis formula; calculating the displacement of the soil body at the buried depth of the existing tunnel; calculating the longitudinal additional load of the existing tunnel structure; calculating the longitudinal equivalent flexural rigidity and equivalent shear rigidity of the existing tunnel structure; and calculating the vertical displacement on the axis of the existing tunnel structure under the action of the additional load, and calculating the longitudinal deformation of the tunnel structure under the additional load. According to the method, the problem that the stratum loss rate is difficult to determine due to stratum difference can be effectively solved, and the ground surface settlement value caused by shield construction and the soil displacement at the buried depth of the existing tunnel can be rapidly and accurately obtained.

The invention relates to the technical field of connection structure testing, in particular to a bridge deck slab dry joint connection structure testing method which comprises the following steps: preparing a bridge deck slab test piece containing a steel structure embedded dry joint; building a testing device, and arranging strain, displacement and pressure sensors in a dry joint area; carrying out a graded loading test, including static loading to 1.5 times of the designed bearing capacity and dynamic cyclic loading; an environment simulation test is carried out, and repeated loading is carried out in a temperature and humidity circulation box simulation environment; data are evaluated through a multi-source data fusion optimization algorithm model, and indexes such as flexural rigidity and shear rigidity are calculated; in addition, a construction stage simulation test is added, and the alignment deviation and the filling compactness of the components are monitored. According to the method, the structural performance can be comprehensively evaluated, key indexes can be accurately evaluated, durability degradation can be scientifically predicted, construction simulation is innovated, test conditions are guaranteed to be consistent, visualization and verification are achieved, and the problem of limitation of a traditional test method is effectively solved.

The invention discloses a cable-stayed bridge cable force testing method and device, a storage medium and a product, and relates to the technical field of cable-stayed bridge cable force testing. A cable-stayed bridge comprises a stay cable connected with a shock absorber; the cable-stayed bridge cable force test method comprises the following steps: carrying out a tension test on a stay cable to obtain a flexural rigidity value of the stay cable and a strain increment value caused by vibration of the stay cable near an initial balance position, and vibrating the stay cable to obtain a tension test value group of the stay cable; obtaining a simulated tension value group of the stay cable according to a preset condition; and obtaining the cable force value of the stay cable according to the simulated tension value group. According to the cable-stayed bridge cable force testing method, the problem of cable force testing errors caused by the fact that the shock absorber changes the boundary condition is effectively solved, the accuracy of cable-stayed bridge structure safety evaluation is improved, the stress condition of the stay cable under the real boundary condition can be reflected, and the structural stability of the cable-stayed bridge can be better monitored and maintained.

The invention belongs to the technical field of structural safety detection, and discloses a method for updating flexural rigidity of a non-uniformly degraded girder of a bridge based on vehicle response, which comprises the following steps: (1) carrying out a rapid load test on the bridge; (2) constructing a stiffness function considering non-uniform degradation of the main beam; and (3) establishing a target function of displacement and strain shape combination and finishing model updating. According to the method, the rigidity distribution condition of the main beam is inversed by using a rigidity function and a model updating method based on the non-uniform degradation of the main beam of the bridge, the continuity and rationality of the rigidity of the main beam are ensured, and the rigidity of a large number of bridge units can be updated by using fewer parameters. The provided objective function meets the requirement of full-bridge non-uniform rigidity updating, the problem of distortion of an optimization result of a single objective function is solved, and a large amount of structural information can be provided for main beam rigidity inversion. Required response can be obtained through a rapid load test, and the defects that a bridge load test is high in cost and long in time are effectively overcome.

The invention discloses a steel plate floor support plate and an implementation method, and aims at solving the problems that a traditional floor support plate is insufficient in rigidity and strength, large in steel consumption, complex in construction, low in material utilization rate and the like. The floor support plate comprises a wide upper flange (the minimum width is larger than or equal to 30 mm), a wave-shaped reinforcing steel bar web member, a lower chord reinforcing steel bar and a profiling thin-bottom steel plate, the wide upper flange is of a combined type or thin steel plate type or trapezoidal steel pipe structure, and a side plate forming an inclination angle with a vertical shaft enhances the out-of-plane stability; the inclination angles of the steel bar web members are consistent with those of longitudinal ribs (trapezoidal ribs, closed inverted triangular ribs and the like) of the upper flange side plates and the profiled thin-bottom steel plates, so that line-surface contact welding is realized; the profiled thin-bottom steel plate is provided with longitudinal ribs and transverse ribs, so that the overall rigidity is improved; the lower chord steel bar adopts a double-layer design to strengthen node stress. According to the implementation method, industrial production is achieved through cold roll forming, automatic resistance welding and other processes. A traditional triangular truss is optimized into a trapezoid and four-side box type space structure, the bending rigidity is remarkably improved (the inertia distance between the upper flange and the profiling thin bottom steel plate is increased by 40% or above), the steel consumption is reduced by about 30%, the connection reliability is enhanced, meanwhile, the concrete consumption is reduced, the construction process is simplified, and the structure is suitable for various building scenes such as large span and heavy load.

The invention discloses a polyester fiber acoustical board with high yield strength. The polyester fiber acoustical board comprises a micro-perforated metal surface layer, a gradient density polyester fiber layer, a honeycomb metal framework layer and an elastic damping bottom layer which are sequentially stacked and fixed through mucilage glue from top to bottom. A vertically-distributed metal surrounding plate is arranged around the side edge of the micro-perforated metal surface layer, the metal surrounding plate and the micro-perforated metal surface layer are of an integrally-formed structure, and the gradient density polyester fiber layer and the honeycomb metal framework layer are wrapped by the metal surrounding plate. And the honeycomb metal framework layer is fixed with the adjacent upper and lower layers through mucilage glue, and is also fixed with the metal coaming through rivets. By means of the innovative composite lamination design, the strength defect of a traditional polyester fiber acoustic board is effectively overcome. The micro-perforated metal surface layer and the integrally formed metal coaming form a rigid outer frame, so that the internal fiber layer is protected from mechanical damage, and the overall flexural rigidity is remarkably improved through the bearing effect of the metal framework.

The invention discloses a focusing mechanism adapting to vibration and impact environments, which comprises a focusing fixed cylinder and a focusing movable cylinder, a fixed lens group is connected with the focusing fixed cylinder through a screw, a to-be-adjusted assembly is connected with the focusing movable cylinder through a screw, and a guide part is arranged on the focusing movable cylinder; and the three optical axes are uniformly distributed and connected to the circumference of the focusing moving cylinder through optical axis connecting screws. According to the focusing mechanism adapting to the vibration and impact environment, three locking cylinder pairs are evenly distributed on the circumference, the focusing position locking function is separated from focusing transmission threads and guide cylinders, the locking reliability of the focusing position is guaranteed, meanwhile, the bending rigidity of the focusing mechanism is improved through the three locking cylinder pairs, and the service life of the focusing mechanism is prolonged. And moreover, the focusing screw thread pair and the guide cylinder pair cannot be damaged, and the use reliability of the focusing mechanism under the working conditions of vibration and impact is greatly improved.

The invention relates to the technical field of constructional engineering equipment, in particular to a rigidity and energy dissipation adjustable composite energy dissipation bearing device which comprises a first connecting plate, a second connecting plate, a first damping part and a second damping part. The first damping piece is arranged on the first connecting plate on the column body in a friction sliding mode, and the second damping piece is connected between the beam body and the first damping piece in an included angle mode, so that the flexural rigidity of the beam-column joint can be effectively improved under the action of frequent earthquakes, and the initial rigidity and lateral displacement resistance of the structure are enhanced; the rigid response performance of the structure under the action of small earthquakes is improved; the second damping piece can adjust the energy dissipation path through the change of the included angle between the length direction of the second damping piece and the axis of the column body in the earthquake action process, the friction sliding mechanism of the first damping piece is matched, the energy dissipation capacity of the joint under the earthquake action is effectively improved, and therefore structural stress concentration is reduced, and structural damage is delayed. The structure is light in weight, convenient to install and wide in application range.

The invention discloses a method for rapidly evaluating the flexural rigidity of a bridge under vehicle-induced excitation, and belongs to the technical field of flexural rigidity evaluation of variable cross-section beams. The method comprises the following steps of: firstly, acquiring a bridge time-history response by adopting vehicle movement loading, separating a power component by utilizing a VMD method, then identifying a main frequency of an IMF component through FFT, removing the power component higher than a bridge fundamental frequency, and reconstructing a bridge actual measurement quasi-static time-history response; then, an axle effect in bridge actual measurement quasi-static time history response is eliminated, an influence line recognition model is established, and Tikhonov regularization is introduced to further solve a deflection influence line; then deriving an analytic solution of a deflection influence line of the variable cross-section continuous beam based on a virtual work principle, establishing a mathematical relationship between the flexural rigidity and the deflection influence line, and identifying the flexural rigidity of the bridge through the deflection influence line based on the mathematical relationship to obtain flexural rigidity distribution of the full bridge; finally, multiple evaluation indexes are defined and calculated, the bending rigidity distribution of the full bridge is comprehensively evaluated, and the method has the advantages of being good in engineering applicability and high in safety evaluation innovativeness.

The invention relates to a manufacturing process and equipment suitable for a small part split welding assembly, and belongs to the technical field of small part split welding assembly machining. According to the curvature radius, a plane area, a transition area and a corner area are divided, rhombic grids, gradually-changed rhombic grids and radial fan-shaped grid reinforcing ribs are arranged, the flexural rigidity of all the areas is improved in a targeted mode, and the machining precision of the small part split welding assembly is improved. The method comprises the following steps of: firstly adopting a laser scanner to detect the deformation quantity and dynamically applying reverse prestress in combination with a hydraulic compensation device so as to avoid local collapse or warping, then realizing quick remodeling of different products through a rotatable adaptive block and an elastic compensation mechanism, solving the problems of poor adaptability and large precision loss of a traditional rigid clamp, and finally detecting the deformation quantity by adopting the laser scanner. The defects that a traditional compensation device is slow in response and high in energy consumption are overcome, deformation is accurately corrected in real time, finally, the multi-axis linkage welding gun set is provided with an independent pressure sensor and temperature closed-loop control, it is ensured that welding pressure and temperature are stable, the problems of thermal deformation and insufficient welding in traditional welding are solved, and the overall precision is 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 embodiment of the invention discloses a method for determining the dynamic response characteristics of power equipment in a damaged state, and the method comprises the steps: obtaining the structural damping ratio and the jth flexural rigidity ratio of the power equipment, and the ground motion acceleration at the jth moment and the ground motion acceleration at the (j + 1) th moment, which are inputted from the outside, and then determining the natural vibration frequency according to the jth flexural rigidity ratio, determining an acceleration increment, a speed increment and a displacement increment according to the natural vibration frequency, the structural damping ratio, the seismic acceleration at the jth moment and the seismic acceleration at the (j + 1) th moment, and finally determining an acceleration response at the (j + 1) th moment, a speed response at the (j + 1) th moment and a displacement response at the (j + 1) th moment according to the acceleration increment, the speed increment and the displacement increment; and different devices can be finely reinforced, so that the structural layout and the material selection are optimized, the anti-seismic performance of the devices is improved, and the vibration amplitude and the damage degree of the devices in an earthquake are reduced.

The invention discloses a frame structure design method based on rigidity reduction. The method comprises the following steps that 1, rod end bending moments Mb and Mc and axial force Nc of frame beams and columns are obtained through calculation; step 2, obtaining actual reinforcement areas Asb0 and Asc0, section sizes and concrete strength of frame beams and columns; 3, the equivalent stiffness Kb1 of the frame beam is obtained through calculation according to the formula Kb1 = Mb0.75y / phi b0.75y; 4, the equivalent stiffness Kc1 of the frame column is obtained through calculation according to the formula Kc1 = Mc0.75y / phi c0.75y; 5, comparing the equivalent stiffness of the frame beam and the frame column with the initial flexural stiffness, and ending after the deviation is less than or equal to 15%; 6, calculating a shear force design value of the frame beam, calculating stirrups needing to be configured for the frame beam, and rechecking a shear-resistant section; and 7, calculating a shear force design value of the frame column, calculating stirrups needing to be configured for the frame column, and rechecking a shear-resistant section. Compared with the prior art, an overall calculation model of the frame structure is established, the real rigidity of a structural member is obtained through multiple iterations, section reinforcement is optimized, and the reinforcement amount is reduced; and the overall anti-seismic performance is improved.

The invention provides a method and a system for analyzing influence of local loading and unloading on deformation of an existing shield tunnel, and relates to the field of influence of foundation pit construction on the existing tunnel. The method comprises the steps that shield tunnel vertical additional stress caused by foundation pit excavation is calculated through a Mindlin stress solution; analyzing the influence of the longitudinal axial force on the flexural rigidity and shear rigidity of the circular seam joint, and dividing a joint deformation mode into three stages according to the relative magnitude of the axial force and the bending moment and the vertical displacement between rings; a tunnel displacement control equation is established based on a Winkler foundation model, loop iteration is conducted through a state space method, and the rigidity of a circular seam joint is dynamically adjusted to be matched with the final deformation mode of the circular seam joint; and finally, constructing a prediction system, and outputting a deformation value of the shield tunnel by inputting the number of iterations and parameters of a foundation pit, bolts, concrete and segments. By means of the method, deformation prediction of the existing shield tunnel can be achieved for foundation pit construction, an effective scientific basis is provided for foundation pit engineering construction, the problem that parameter decision of operators on a construction site is difficult is solved, and foundation pit engineering site construction is truly guided.

The invention relates to the field of buildings, in particular to a reinforced precast slab, an ultimate flexural rigidity calculation method and a manufacturing method.The reinforced precast slab comprises composite plates arranged in a concrete layer in parallel at intervals, the composite plates are arranged in the same plane, and slab bodies of the composite plates are parallel to the slab face of the precast slab; reinforcing holes distributed in an array mode are formed in a plate body of the composite material plate. While the design and use requirements of the prefabricated slab are met, a steel bar structure in a traditional reinforced concrete prefabricated slab is replaced with the composite material plate, the use amount of concrete materials is reduced, and the service life of the prefabricated slab is prolonged.

The present application provides a pre-stressed anti-vibration hammer and a pre-stress determination method and system, the pre-stressed anti-vibration hammer comprising a gapped steel strand, an assembly integrated hammer head and an anchoring clamp, wherein the gapped steel strand comprises a central layer round wire, a middle layer molded wire and an outer layer round wire from inside to outside; a gap is provided between the central layer round wire and the middle layer molded wire, and the gap is filled with a lubricating grease, such that the friction resistance between the central layer round wire and the middle layer molded wire is reduced, and pre-applying a stress to the central layer round wire is facilitated; the middle layer molded wire is of an arch structure, and the arch body structure increases the moment of inertia for a circle center, such that the bending rigidity of the steel strand is enhanced; and two ends of the central layer round wire are connected with the assembly integrated hammer head, the anchoring clamp is assembled in a hollow portion of one end of the assembly integrated hammer head away from the central layer round wire, and is configured to clamp the central layer round wire to which a target stress is pre-applied, a tensile stress generated by an impact load firstly counteracts the tensile stress generated between the outer layer round wire and a middle layer strand after the stress is pre-applied, and the bending rigidity of the steel strand can be increased.

A stabilizer clamp (20) for fastening a stabilizer rod (40) to a vehicle is disclosed. The stabilizer clamp (20) has a receptacle (22) for the stabilizer rod (40), wherein the receptacle (22) is formed as an intermediate space between two legs (24, 24a, 24b) for fastening the stabilizer clamp (20) to the vehicle and a bend (26) connecting the two legs (24, 24a, 24b). The stabilizer clamp (20) is made predominantly of plastic or predominantly of fiber-reinforced plastic. The arch (26) has, in an axially arranged sectional plane relative to the center of gravity of the sectional plane, a flexural rigidity with respect to a curvature about the axial axis of at least 35,000,000 Nmm2, wherein the sectional plane passes through a circle center (28) of the arch or a fictitious radial center of a stabilizer rod for whose diameter the stabilizer clamp (20) is designed.

The invention belongs to the related technical field of health detection, and discloses a structural system identification method and equipment during pouring construction of an arch bridge cantilever, and the method comprises the following steps: dividing the construction process of the arch bridge cantilever into a plurality of construction stages, and designing a measuring point position based on an observability state equation of the corresponding construction stage, and performing structural system identification on each construction stage by utilizing an observability technology one by one to obtain the bending rigidity and the axial rigidity of all arch rib beam units in the corresponding construction stage. According to the method, in each construction stage of arch bridge cantilever casting, the equivalent stiffness matrix equation is converted into the observable state equation, the observable state equation is solved through the null-space method, analytical solutions of the axial stiffness and the bending stiffness of arch rib beam section units in each construction stage are obtained, and the recognition precision is improved.

The invention relates to a suspension bridge main cable finished bridge line shape analytical calculation method considering the torsional rigidity of a main cable, electronic equipment and a medium, and the calculation method comprises the following steps: considering the dead weight of the main cable and the load effect of a suspender, simultaneously including the tensile rigidity and the flexural rigidity of the main cable, and constructing a geometric precise equilibrium equation of the main cable under the dead weight and the load of the suspender; the influence of the bending moment in the main cable is ignored, incomplete boundary conditions are considered, and a quadratic approximate solution is solved based on a direct perturbation method; considering the influence of the bending moment of the main cable, combining the complete boundary, solving the influence of the bending moment of the main cable on the static linearity of the suspension bridge based on a direct perturbation method, and obtaining a second-order approximate solution considering the bending moment; through the compatibility condition of the left end point and the right end point, the corrected catenary equation and the second-order approximate solution considering the bending moment are combined. Compared with the prior art, the influence of the bending rigidity of the main cable is considered, the mechanical concept is clear, shape finding under different boundary conditions can be considered, and design and calculation of the main cable can be further guided.

The invention discloses a stay cable analysis digital twinborn model construction method, which comprises the following steps of: constructing a stay cable space three-dimensional vibration motion partial differential equation based on a material linear elasticity hypothesis and a double-coordinate system theory, and setting boundary conditions and initial conditions of the stay cable space three-dimensional vibration motion partial differential equation; a Galerkin multi-mode truncation method is adopted to obtain a displacement function of superposition of an end displacement excitation item and a vibration mode item; deducing a three-way strong coupling ordinary differential equation set through symbolic operation, and solving by using a step-variable Runge-Kutta algorithm to obtain a stay cable analysis digital twin model with stable parameters; structural response data are obtained through the sensor network and calculated, and when the obtained cable force, flexural rigidity and damping ratio exceed threshold values, a model updating mechanism is triggered for updating; and then the updated stay cable analysis digital twin model is obtained. According to the method, the real dynamic characteristics of the stay cable can be restored with high precision, and effective support is provided for structural state evaluation and early warning.

The invention relates to the technical field of composite material structural member design, in particular to a composite material pipe fitting bending rigidity prediction method based on deep learning and a system and a terminal thereof. The composite material pipe fitting bending rigidity prediction method comprises the following steps: testing the bending resistance of a layered composite material pipe fitting by using a finite element model under a cantilever beam condition; establishing a basic data set; processing the basic data set to obtain a standard data set; constructing a neural network model, and training the neural network model by using the standard data set to obtain a pipe bending rigidity prediction model; and outputting the flexural rigidity by using the model. The method comprises the following steps: acquiring data by simulating a composite material pipe fitting, dividing the preprocessed data into layer paving data and pipe fitting geometric data as independent variables and flexural rigidity as dependent variables, making a sample data set, constructing a pipe fitting flexural rigidity prediction model, and calculating the flexural rigidity of the pipe fitting through basic data. And low-cost, rapid and accurate design of the composite material pipe fitting is realized.

The invention discloses a pipe roofing structure deformation calculation method, system and device considering pipe-culvert soil mass resistance and a storage medium. The method comprises the following steps that S1, a pipe roofing structure is simplified into an elastic thin plate; meanwhile, according to the boundary conditions, the problem is simplified into the deformation problem of the elastic thin plate which is subjected to uniform load on the Winkler elastic foundation and has fixed opposite sides and simply supported opposite sides, and a differential equation of the bending surface of the thin plate on the Winkler elastic foundation and a boundary condition expression of the thin plate are obtained; s2, determining the elastic modulus when the pipe-roofing structure is simplified into an elastic thin plate, and calculating the flexural rigidity D of the pipe-roofing structure; and S3, solving the differential equation of the bending surface of the thin plate on the Winkler elastic foundation by adopting a mixed solution of trigonometric series and a force method to obtain a deflection formula of the elastic thin plate which is arranged on the elastic foundation and is subjected to uniform load distribution. The method can accurately predict the deformation of the pipe roofing structure.

The invention discloses a steel frame structure damage identification method and system based on damage morphological parameters, and the method comprises the steps: obtaining the relation between the damage degree and the reduction of an elastic modulus according to a steel damage test; the nondestructive height ratio, the average loading elastic modulus and the damage model of the damaged section are determined through the section damage morphological parameters; according to the steel member section damage model, the damage section distribution and the steel member deflection deformation value, a damaged steel member damage model expressed by damage form parameters is constructed, and the corresponding residual bearing capacity and flexural rigidity of the steel member are obtained; according to the section of the damaged steel frame structure and the steel member damage model, the mechanical relation between the damage degree and the bearing capacity of the steel frame structure is obtained, the damage model of the steel frame structure is constructed, and the damaged steel frame structure damage identification method is provided. And judging whether the residual bearing capacity and rigidity of the damaged steel frame structure can meet the stress requirements or not. The method is applicable to safety and reliability evaluation of any steel frame structure.

The invention relates to a construction method for reinforcing a landslide through prefabricated high-bending-resistance anti-slide piles, and belongs to the technical field of slope reinforcing engineering. In order to solve the problems that a traditional anti-slide pile is insufficient in flexural rigidity and difficult to reinforce after construction, the I-shaped anti-slide pile structure is adopted and is formed by connecting an upper wing plate pile, a lower wing plate pile and a web pile through a mortise and tenon joint structure, and the flexural rigidity is 3.69 times and 4.15 times that of a square pile and a round pile respectively. During construction, the upper wing plate piles are firstly driven to penetrate through the sliding surface, then the unit piles are formed through mortise and tenon connection of the web piles and the lower wing plate piles, and the continuous underground diaphragm wall is formed by repeatedly driving and utilizing the side mortise and tenon structures of the adjacent pile bodies. Water-absorbent resin (the water absorption rate is larger than or equal to 80 g / g) is smeared at the mortise and tenon joint, the functions of sealing and reducing the pore water pressure are achieved, and the slope stability is improved. The anti-slide pile is suitable for landslide reinforcement of soft soil and complex stratums, modular expansion construction can be achieved, adaptability is high, and the mechanical property and engineering applicability of the anti-slide pile are effectively improved.

The utility model belongs to the technical field of steel structures, and particularly relates to I-shaped steel for a bridge, which comprises an I-shaped steel body, a plurality of holes are uniformly distributed on a web of the I-shaped steel body, and foamed aluminum is filled in each hole. A plurality of reinforcing ribs are further arranged on a web of the I-shaped steel body, the reinforcing ribs and the holes are distributed in a staggered mode, every two adjacent I-shaped steel bodies are connected through a connecting mechanism, the holes are of a hexagonal structure and evenly divided into a plurality of groups, and the multiple groups of holes are evenly distributed in the length direction of the I-shaped steel body. The plurality of groups of holes and the plurality of reinforcing ribs are alternately distributed; according to the utility model, the plurality of holes are formed in the I-shaped steel body, and the foamed aluminum is filled in each hole to form a'metal framework + core material 'composite structure, so that compared with a solid web, the weight is reduced by 25%-30%, and the flexural rigidity is improved at the same time; the adjacent I-shaped steel is connected through the connecting mechanism, and detachable connection is achieved.

The sandwich panel of the present invention comprises: a foamed molded body; a first thermoplastic continuous fiber reinforced woven body fused to an upper portion of the foamed molded body; a second thermoplastic continuous fiber reinforced woven body fused to a lower portion of the foamed molded body; and one or more composite material bars embedded in the foamed molded body. The sandwich panel exhibits excellent rigidity (flexural strength, flexural rigidity, and maximum deflection), lightweight properties, and the like.

This invention discloses a method, system, equipment, and storage medium for calculating the deformation of a pipe-jacking structure considering the soil resistance between the pipe and culvert. The method includes the following steps: S1. Simplifying the pipe-jacking structure as an elastic thin plate, and further simplifying the problem to the deformation of an elastic thin plate with fixed opposite sides and simply supported opposite sides under a uniformly distributed load on a Winkler elastic foundation, obtaining the differential equation of the bending surface of the thin plate on the Winkler elastic foundation and the expression for the boundary conditions of the thin plate; S2. Determining the elastic modulus when the pipe-jacking structure is simplified to an elastic thin plate, and calculating the bending stiffness D of the pipe-jacking structure; S3. Solving the differential equation of the bending surface of the thin plate on the Winkler elastic foundation using a hybrid solution method combining trigonometric series and the force method, obtaining the deflection formula of the elastic thin plate placed on the elastic foundation under a uniformly distributed load. This invention can accurately predict the deformation of pipe-jacking structures.