18 results about "Bond slip" patented technology

This invention relates to a method for establishing a constitutive model of localized bond in ultra-high performance concrete (UHPC) structures and its finite element method implementation. Firstly, based on the energy release rate per unit crack surface, a coarse aggregate-fiber competitive fracture index is proposed. Based on this, a multi-field coupled effective fiber weighting function is constructed, explicitly incorporating factors such as coarse aggregate volume fraction, particle size, tensile strength, fiber content, bond length ratio, and cover thickness ratio. Furthermore, an internal state variable representing the degree of coarse aggregate participation is introduced within a four-stage bond-slip framework, expressing the bond stress as a superposition of three parts: matrix, fiber bridging, and coarse aggregate-rib mechanical interlocking. A dedicated UHPC-CA-reinforcement interface element and numerical implementation scheme are designed, which can improve the accuracy and engineering usability of the analysis of anchorage and lap zone in UHPC containing coarse aggregate.

The invention discloses a concrete member simulation model building method based on a BIM technology, and relates to the technical field of concrete member BIM simulation, and the method comprises the steps: obtaining design information including the geometric dimension definition of a member, a steel bar arrangement detail drawing, a concrete strength grade requirement and an external load action parameter; the method comprises the following steps: establishing a parameterized three-dimensional geometry on a BIM platform, associating strength requirements, implanting a parameterized reinforcement network model containing spatial trend, diameter, protective layer thickness and bond-slip relationship according to a reinforcement detail drawing, integrating to generate a preliminary BIM integrated model, calling a structure analysis engine to execute static and dynamic coupling numerical analysis by taking the model, strength and load as input, and establishing a structural analysis model; and generating a multi-working-condition mechanical response data set. According to the method, through reinforcement bond-slip relation definition and BIM model direct-connection static and dynamic coupling analysis, the integrity of concrete member simulation modeling and mechanical analysis is improved, and modeling and analysis integrated connection is achieved.

The invention belongs to the technical field of rock soil and structural engineering, and discloses an anchor rod bearing performance prediction method and related device based on data driving and physical constraint, and the method comprises the steps: obtaining a short anchor test curve of a to-be-tested anchor rod; based on the short anchor test curve of the to-be-tested anchor rod, and in combination with a pre-constructed bond-slip model parameter identification model, obtaining multi-stage parameters of the bond-slip model; the pre-constructed bonding-slippage model parameter identification model is a decision tree model in which preset mathematical physical constraints are introduced; substituting the multi-stage parameters of the bond-slip model into the four-linear bond-slip control equation to generate a load-slip curve of the to-be-tested anchor rod; according to the load-slip curve of the to-be-tested anchor rod, obtaining a preset bearing performance index of the to-be-tested anchor rod, and taking the preset bearing performance index as a bearing performance prediction result of the to-be-tested anchor rod; according to the method, the test cost is greatly reduced, the prediction effect is improved, high universality can be kept, and a reliable basis is provided for design and optimization of the anchor rod.

The application discloses a kind of digital twin's fiber composite arch reinforced tunnel structure evaluation method, it is related to tunnel health monitoring technical field, establishes bonding slip model and total stress model, is combined with coupling temperature variation equation, coupling humidity variation equation, constructs damage rate model;Real-time data are collected, total stress is calculated after Gaussian process interpolation processing, calculate residual life and first assess whether to replace;When no replacement is needed in first assessment, future state is simulated using time series reasoning network and finite element method and life is assessed again to decide whether to replace lattice reinforced fiber composite arch, realize the dynamic evaluation and life prediction of lattice reinforced fiber composite arch reinforced tunnel structure, improve the evaluation accuracy and forwardness.

The application provides a joint bending stiffness calculation method, an electronic device and a storage medium. The method comprises the following steps: when a test beam is subjected to graded loading, the joint opening amount of the node area of the test beam and the actual strain of the anchorage reinforcement in the non-node area of the test beam under different load states are measured respectively; the structure parameters of the test beam are obtained, and the bond slip amount of the non-node area under different load states is calculated respectively according to the structure parameters and the actual strain; and the joint bending stiffness is calculated according to the bond slip amount and the joint opening amount. The application can improve the calculation accuracy of the joint bending stiffness of the anchorage joint.

The invention discloses a reinforcing steel bar and concrete interface displacement field testing method and device.The displacement field testing device is mainly composed of a top plate, a bottom plate, a balance plate, a lead screw assembly, a sleeve, an upper loading head, a lower loading head, a testing machine and a DIC testing device.According to the displacement field testing method, a shear test piece is fixed through the displacement field testing device; carrying out a shear experiment; collecting a speckle pattern of the interface through the DIC test device, and processing the speckle pattern to obtain a displacement field; the method comprises the following steps: firstly, dividing a single-side J-integral path in a displacement field, determining a change curve of single-side J-integral along with loading time through a J-integral calculation formula, finally, extracting axial strain of a stage line on the displacement field, and determining a bonding-slip curve by utilizing a relationship between interface shear stress and the axial strain. The method has the advantages of low experiment cost, high experiment success rate, simplicity and convenience in operation and the like.

The application provides a WGAN-based FRP sheet and concrete interface bonding slip model generation method, which can automatically, quickly and accurately obtain the bonding slip model and has a wide application prospect. After the automatic and rapid acquisition of the bonding slip model, the bonding performance between the FRP sheet and the concrete can be accurately reflected, and a safe and reliable reinforcement component design calculation method can be established. The WGAN is used to predict the strain, so that the training process can be simplified and the training can be stable. The WGAN can replace the traditional experimental analysis to quickly and accurately establish a bonding strength model. The LSTM is used as the generator of the WGAN model, so that the gradient disappearance and explosion problems of the RNN are solved, and the strain data related to time can be more accurately predicted. The CNN is used as the discriminator of the WGAN model, so that the quality and convergence speed of the generated samples are improved.

The invention discloses a method for analyzing the bending performance of a steel-concrete sandwich panel based on strain monitoring, and relates to the technical field of structural performance evaluation, and the method comprises the following steps: S1, collecting cross section distributed strain data, and reconstructing a continuous strain field along the height direction of a cross section based on a spatial interpolation algorithm; based on the continuous strain field, dynamically tracking the position of a neutral shaft, and performing staged calculation to obtain a macroscopic bending moment-curvature relation and full-field deflection distribution; and S2, based on the continuous strain field, extracting strain data of paired sensors at the steel-concrete interface. According to the method for analyzing the bending performance of the steel-mixed-steel sandwich panel, the stress state of the cross section is finely described by reconstructing the continuous strain field, deviation caused by traditional discrete point monitoring and fixed assumption is overcome, and therefore the response process of the structure under the load effect is more truly reflected, and the bending performance of the steel-mixed-steel sandwich panel is improved. The dynamic quantitative evaluation of the steel and concrete bond slip behavior is realized.

This invention provides a method for reinforcing post-tensioned prestressed fiber-reinforced beams to control cracks in humid and hot environments. The specific steps are as follows: First, the area of ​​the bonded auxiliary fiber-reinforced reinforcement is obtained based on the lower limit of its reinforcement area. Second, a bond-slip model of the bonded auxiliary fiber-reinforced reinforcement and concrete is established under standard and humid and hot environments. The bond-slip constant and the amplification factor of the beam crack width under humid and hot environments are solved, and the height of the compression zone of the fiber-reinforced beam is obtained based on the amplification factor. Third, the area of ​​the i-th layer of unbonded prestressed fiber-reinforced reinforcement is obtained based on the minimum reinforcement area of ​​the i-th layer of unbonded prestressed fiber-reinforced reinforcement in the fiber-reinforced beam. Fourth, bonded auxiliary fiber-reinforced reinforcement and unbonded prestressed fiber-reinforced reinforcement are arranged, concrete is poured, and prestressing is applied to obtain the post-tensioned prestressed fiber-reinforced beam. This invention accurately and conveniently calculates the limit value of the reinforcement amount, avoiding repeated verification of the maximum crack width of the beam.

The present application relates to the design of flexural capacity of hybrid shear walls, which are assembled and cast-in-situ, and proposes a method and device for the sectional checking of the flexural capacity of slotted shear walls. The wall near the opening or vertical slot is divided into slot-controlled and non-slot-controlled zones along the wall height. In the slot-controlled zone, a three-stage stress evolution model of additional reinforcement is established by using a parametric bond-slip relationship at the new and old concrete interface. Then, the flexural capacity of the non-slot-controlled zone is superimposed to determine the plastic hinge length and overall ultimate bending moment. The design flexural capacity and the correction coefficient compared with the test peak value are obtained by numerical integration or simplified formula. The device modularizes the above method, which can automatically output the three-stage load curve and design value by inputting geometric and reinforcement parameters. It takes into account the interface bond degradation and overall bending response, and is suitable for the integration of design specification provisions and engineering software.

The invention discloses a beam type reinforced concrete bond slip performance detection device which is characterized by comprising bond slip performance detection equipment, and a concrete drawing machine is arranged in the bond slip performance detection equipment; a working table is further arranged in the bonding slippage performance detection equipment, a four-station machining table is arranged on the upper end face of the working table, a rotating platform is installed on the four-station machining table, and four sets of concrete test block clamps are arranged on the upper end face of the rotating platform in a surrounding mode along the circle center of the rotating platform. The four-station machining table is matched with an adaptive notch formed in the center of the rotating platform to be connected with a limiting beam in an embedded mode, precise positioning rotation of the rotating platform is achieved, and concrete test block clamps on the four stations can be sequentially rotated to the position below a concrete drawing machine to be detected. According to the structural design, the other three stations can synchronously carry out preparation work such as test block clamping, data recording or test block replacement while drawing detection is carried out at one station, so that the detection efficiency is remarkably improved, and the equipment vacancy time is shortened.

The method for establishing the bond-slip constitutive relation of reinforced concrete based on MFCC belongs to the technical field of analysis method of bond behavior of reinforced concrete. The method for establishing the method, first, obtains the parameters of reinforced concrete and the acoustic emission characteristic parameters in the bond failure process of reinforced concrete; then, respectively draws the time point-acoustic emission characteristic parameter curve and the time point-MFCC characteristic parameter curve, and takes the time point corresponding to the maximum downward fluctuation degree of the MFCC characteristic parameters in the time range as the first bond failure stage division time point of the reinforced concrete; finally, divides the bond-slip curve of the parameters of the reinforced concrete based on the first bond failure stage division time point, and establishes the bond-slip constitutive model of the parameters of the reinforced concrete based on the obtained bond-slip curve containing the effective real damage stage. The method for establishing can adapt to the influence of material parameters, express the real process of damage, and the process of establishing the model has strong generalization ability.

The application provides a lightweight super high-performance concrete and steel bar bonding slip calculation method and device, comprising: determining a preset number of pull-out test pieces according to test piece parameters; respectively performing pull-out tests on each pull-out test piece, obtaining a target bonding slip curve of the lightweight super high-performance concrete and the steel bar according to all pull-out test results; and setting a bonding slip curve model and a preset number of function relationship formulas according to the target bonding slip curve, and calculating a bonding slip curve of a to-be-tested pull-out test piece. Through the pull-out tests on the preset number of pull-out test pieces, the bonding slip curve model and the function relationship formulas are set, so that when the to-be-tested pull-out test piece is used subsequently, the bonding slip curve of the pull-out test piece is obtained through the bonding slip curve model and the function relationship formulas, the bonding performance is obtained, and the pull-out test piece does not need to be tested again, the processing process of the pull-out test piece is reduced, and the promotion and application of the concrete structure are improved.

The invention relates to the technical field of ultra-high performance concrete, and discloses an economical UHPC (Ultra High Performance Concrete) double-rib bonding and anchoring performance prediction and design method which comprises the following steps: acquiring initial parameters of an economical UHPC double-rib anchoring assembly to be predicted and designed, the initial parameters at least comprise material mechanical property parameters of economic UHPC, physical property parameters of steel bars and geometric construction parameters of double-bar anchoring; and on the basis of the initial parameters, constructing and solving a full curve constitutive model used for representing the bonding and slipping behaviors of the reinforcing steel bars and the economical UHPC interface in the double-bar anchoring assembly, so that a bonding stress-slipping amount relation curve of the assembly in the full loading process is obtained. The objective of the invention is to solve the problems of inaccurate anchoring performance prediction and lack of reliable basis in design caused by incapability of completely and accurately describing the constitutive relation of the whole bonding-slipping process between the economical UHPC and the double ribs in the prior art.

The application discloses a kind of super high performance concrete and the bond slip constitutive relation calculation method of reinforcing steel, comprising the following steps: according to structural design and concrete mix proportion, the bond length of pulling test in pulling reinforcing steel, the thickness of the protective layer of reinforcing steel and the compressive strength of concrete are determined, and pulling test is carried out;According to the pulling test result, the influence of the selection of pulling test test parameters on bond stress, reinforcing steel bond strength and peak slip is obtained, and the corresponding function relationship is established, according to the test results, the curve of bond stress change with position is obtained by calculation and drawing, and the function relationship of bond stress change with position is obtained by regression;Establish the function expression of the bond slip constitutive relation of super high performance concrete and reinforcing steel.The bond stress when reinforcing steel slips can be accurately reflected by the application, the prediction result is accurate, and the practicality is strong.

The application discloses a concrete bonding slip constitutive model and a calculation method of anchorage length, and comprises the following steps: measuring the bonding stress between basalt rib and super high performance concrete through a pull-out test; based on an existing theoretical model, and by comprehensively analyzing test data, a bonding slip constitutive model suitable for basalt rib hybrid steel fiber super high performance concrete is established; based on bonding slip mechanism analysis, a correction coefficient is introduced to correct the calculation formula of the bonding slip constitutive model of basalt rib hybrid steel fiber super high performance concrete; by substituting test results, fitting coefficients are solved, and the calculation formula of the bonding slip constitutive model of basalt rib hybrid steel fiber super high performance concrete is obtained; and according to relevant basic anchorage length design specifications, a suggested formula of the basic anchorage length of basalt rib hybrid steel fiber super high performance concrete is provided.

The present application relates to a kind of measuring device and method of asphalt pavement base layer and pad between bonding-slippage friction parameter, it is related to road engineering asphalt pavement technical field, including: test piece restraint mechanism, using double-layer collaborative frame structure, including upper test piece bearing part and lower test piece fixed part, upper test piece bearing part is used to accommodate base layer slippage test piece, lower test piece fixed part is used to accommodate pad slippage test piece, both upper and lower alignment, plate surface coincident arrangement, the real interface contact state of construction base layer and pad, horizontal load applying mechanism, vertical load simulation mechanism and multidimensional parameter monitoring mechanism.The present application will double-layer square test piece, horizontal thrust device and electronic measuring equipment and counterweight load are organically integrated, the accurate determination of bonding-slippage friction parameter between base layer and subgrade pad is realized.The integrity of interface and test precision are guaranteed, the stress state of real reproduction pavement base layer is realized the high-precision characterization of bonding-slippage friction parameter.

The invention discloses a reinforced concrete bonding-slippage constitutive relation establishing method based on MFCC, and belongs to the technical field of reinforcing steel bar and concrete bonding behavior analysis methods. The establishment method comprises the following steps: firstly, acquiring reinforced concrete parameters and acoustic emission characteristic parameters in a reinforced concrete bonding failure process; then respectively drawing a time point-acoustic emission characteristic parameter curve and a time point-MFCC characteristic parameter curve, and taking the time point corresponding to the maximum downward fluctuation degree of the MFCC characteristic parameter in the time range as the first bonding failure stage division time point of the reinforced concrete; and finally, dividing a bonding-slip curve of the reinforced concrete parameters based on the division time points of the bonding failure stages, and establishing a bonding-slip constitutive model of the reinforced concrete parameters based on the obtained bonding-slip curve containing the effective real damage stages. The establishment method can adapt to the influence of material parameters and express the real process of damage, and the process of establishing the model has high generalization force.