34 results about "Bond slip" patented technology

The invention discloses a thermal-mechanical coupling behavior numerical simulation system for a reinforced concrete structure, and particularly relates to the field of constructional engineering, and the system comprises a heat conduction analysis module, a mechanical behavior analysis module, a bond slip behavior analysis module and a simulation calibration module. The heat conduction analysis module simulates the temperature field change of the concrete in the fire disaster process by defining temperature related parameters of the concrete; the mechanical behavior analysis module is used for simulating nonlinear mechanical behaviors of concrete and analyzing strength degradation, crack propagation and plastic deformation of the concrete at high temperature in combination with a temperature-dependent material model; and the bond slip behavior analysis module is used for setting a non-linear contact behavior between the reinforcing steel bar and the concrete. According to the invention, comprehensive simulation of reinforced concrete under high-temperature conditions such as fire disasters and the like is realized, and the strength degradation and crack propagation of the concrete and the bond slip behavior of the reinforcing steel bars and the concrete can be accurately predicted in combination with a temperature field and a mechanical field.

The invention relates to the field of building materials and structural engineering, in particular to an analysis method of a composite interface cohesive mechanical behavior. The method for analyzing the cohesive mechanical behavior of the composite interface comprises the following steps: forming the composite interface; respectively applying a tensile load and an alternating electric field in the axial direction and the transverse direction of the modified carbon fiber; establishing a trilinear bond slip constitutive model; measuring an interface impedance phase angle in real time, and calculating an interface damage index; and correcting the trilinear bond slip constitutive model by using the damage index, and analyzing the composite interface cohesive mechanical behavior. According to the method, the nano SiO2 is successfully deposited on the surface of the carbon fiber, synchronous acquisition of interface slippage, strain and impedance spectrum under multi-coupling stress is also realized, and a synergistic effect mechanism of multiple fields to interface damage is conveniently disclosed.

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 invention provides a finite element calculation method for beam moving construction stress of a widening pier of a railway pier. The finite element calculation method comprises the following steps: establishing a three-dimensional model, and performing grid division and refinement; constructing a concrete constitutive model; obtaining a bonding-slip curve of a bonding surface similar to the actual working condition; obtaining soil layer data in a construction range of new and old piers and settlement data of the old piers, and calculating a settlement difference value of the new and old piers in beam moving construction; inputting the obtained parameters into a finite element model for fitting to obtain a concrete plastic damage model CDP and a bonding surface model; defining settlement data to boundary conditions of the bottom of the three-dimensional model of the new and old piers; the method comprises the following steps: simulating top stress change generated in a beam moving process applied to the tops of new and old piers, obtaining a stress distribution cloud chart of the interiors of the new and old piers and a bonding surface through numerical simulation, and comparing a simulation result with parameters obtained by a new and old concrete bonding surface shear failure test and a theoretical calculation value of a local pressure-bearing model; and verifying the accuracy of a stress distribution result and a bonding surface damage result.

The invention discloses a reinforced concrete pull-out test device. The reinforced concrete pull-out test device comprises a device main body, a concrete test piece clamping device, a loading device and a displacement meter fixing device, the clamping device is composed of an upper clamping plate, a lower clamping plate, an upper rotating arm and a lower rotating arm, the upper rotating arm and the lower rotating arm are connected with a common rotating arm rotating shaft, the upper clamping plate and the lower clamping plate are in a step shape, compliance layers are attached to the contact faces, and the rotating arms can independently rotate and be locked so as to adapt to the uneven surface of a test piece, and clamping lateral pressure is reduced. The loading device is composed of a loading plate, a supporting plate and paired symmetrical connecting rod pieces, opposite adjusting nuts on the connecting rod pieces are used for synchronously adjusting the inclination angle of the supporting plate, and a self-centering pair is arranged between the loading plate and the supporting plate, so that loading force is transmitted in the axis direction of the steel bar. The device effectively improves the accuracy and repeatability of the bonding-slipping test, and is suitable for scientific research and engineering detection.

The invention provides a construction method of a geopolymer coating bond-slip constitutive model, and relates to the technical field of concrete bond-slip constitutive research, and the construction method comprises the following steps: carrying out a center pull-out test on a geopolymer coating steel bar pouring concrete test piece to obtain loading end slip, free end slip and bond stress data; calculating the relative slip and the average bonding stress, analyzing the relative slip and the average bonding stress to obtain the relation between the relative slip length and the average bonding stress, and correcting the relation between the relative slip length and the average bonding stress through the geopolymer influence coefficient; the bonding stress data are analyzed, and the relation between the relative anchoring position and the relative bonding stress is obtained; according to the corrected relation between the relative slip length and the average bonding stress and the relation between the relative anchoring position and the relative bonding stress, the geopolymer coating bonding slip constitutive relation is constructed, and the geopolymer coating bonding slip constitutive relation is corrected based on complex network entropy flow logic.

The application discloses a built-in magnetic three-dimensional bond-slip testing device and a mounting testing method thereof, which is used for testing the bond-slip and vertical peeling at the interface of a steel plate-concrete composite structure, is mounted on the inner side of the steel plate before pouring concrete, and comprises a steel shell and a core testing element in the steel shell, wherein the steel shell is magnetically sealed with the bottom of the steel plate; the core testing element comprises a hollow conduit, a sliding head, a pre-tightening spring and six arc-shaped steel belt strain gauges; the arc-shaped steel belt strain gauge comprises a pre-tightening arc-shaped steel belt and a resistance strain gauge attached to the pre-tightening arc-shaped steel belt, and six arc-shaped steel belt strain gauges are arranged in two groups along X, Y and Z directions, respectively, and are used for testing the slip amount along the X and Y directions and the peeling amount along the Z direction between the steel plate and the concrete. The application breaks through the defects of single testing direction and low testing dimension of the existing bond-slip testing, and significantly improves the feasibility of long-term monitoring of the interface damage of the composite structure.

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 relates to the technical field of civil engineering materials, in particular to a fiber asphalt bond slip prediction method based on innovation-first fractional order accumulation, which comprises the following steps: firstly, selecting bond slip values obtained by performing monofilament drawing on basalt fibers in an asphalt matrix as a database, and constructing a non-negative original sequence as the input of a model; secondly, an innovation priority and fractional order accumulation operator is introduced when the model is constructed; then, a genetic algorithm is adopted to seek an optimal parameter in an innovation priority fractional order accumulation operator; and finally, applying the improved grey generalized Verhulst model to the bond slip curve prediction of the basalt fiber. According to the method, the interface performance evolution rule of the basalt fiber in the asphalt matrix can be well predicted, the influence of physical characteristics such as fiber modulus and surface morphology on interface stress transmission can be reflected, and a more reliable theoretical method is provided for predicting the interface performance of the fiber asphalt concrete.

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 discloses a built-in three-dimensional bond-slip testing device and a mounting testing method thereof, which is used for testing the bond-slip and vertical peeling at the interface of a steel plate-concrete composite structure, is mounted on the inner side of the steel plate before pouring the concrete, and comprises a steel shell and a core testing element located in the steel shell, wherein the steel shell is sealed with the bottom of the steel plate; the core testing element comprises a hollow conduit, a sliding head, a pre-tightening spring and six string strain gauges; two of the six string strain gauges are arranged along three directions of X, Y and Z respectively, and are used for testing the slip amount along the X and Y directions and the peeling amount along the Z direction between the steel plate and the concrete. The application is based on a novel internal structure, breaks through the defects of single testing direction and low dimension of the existing bond-slip testing, can realize the repetitive and intermittent non-continuous testing of the interface slip damage, and significantly improves the feasibility of long-term monitoring of the interface damage of the composite structure.

The present application relates to the field of building materials and structural engineering, and particularly relates to a method for analyzing the mechanical behavior of composite interface bonding. The method for analyzing the mechanical behavior of composite interface bonding comprises forming a composite interface; applying tensile load and alternating electric field in the axial and transverse directions of the modified carbon fiber respectively; establishing a three-linear bonding-slip constitutive model; measuring the phase angle of interface impedance in real time and calculating the interface damage index; correcting the three-linear bonding-slip constitutive model by using the damage index and analyzing the mechanical behavior of the composite interface bonding. The present application successfully deposits nano-SiO2 on the surface of carbon fiber, and also realizes the synchronous collection of interface slip, strain and impedance spectrum under multi-coupling stress, which facilitates the revelation of the synergistic mechanism of multi-field on interface damage.

The present application provides a kind of construction method of geopolymer coating bond-slip constitutive model, it is related to concrete bond-slip constitutive research technical field, the present application carries out center pull test to geopolymer coating steel reinforced concrete test piece, obtains loading end slip, free end slip and bond stress data;Calculate relative slip and average bond stress, analyze relative slip and average bond stress, obtain the relationship between relative slip length and average bond stress, the relationship between relative slip length and average bond stress is corrected by geopolymer influence coefficient;Bond stress data are analyzed, and the relationship between relative anchoring position and relative bond stress is obtained;According to the relationship between the corrected relative slip length and average bond stress, and the relationship between relative anchoring position and relative bond stress, the bond-slip constitutive relationship of geopolymer coating is constructed, and the bond-slip constitutive relationship of geopolymer coating is corrected based on complex network entropy flow logic.

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.

This invention belongs to the field of prefabricated bridges, specifically relating to a calculation method for the bond-slip relationship between energy-dissipating reinforcing bars and concrete in assembled bridge piers. The method includes the following steps: assembling the bridge pier; applying quasi-static loading to the assembled bridge pier; calculating the slip at the loading end of the energy-dissipating reinforcing bars; establishing an initial calculation model for the bond-slip relationship between the energy-dissipating reinforcing bars and concrete; calculating the average bond stress before and after yielding in the initial model based on measured and obtained data, thereby obtaining the final calculation models for the bond-slip relationship between the energy-dissipating reinforcing bars and concrete before and after yielding. This invention can be applied to measuring and calculating the bond-slip relationship between energy-dissipating reinforcing bars and concrete in different assembled bridge piers, and has engineering application value.

The invention discloses a calculation method of a bonding-sliding relation between a reinforcing steel bar and cracked concrete, which comprises the following steps: S1, pre-splitting a reinforced concrete drawing test piece through a universal testing machine to obtain pre-cracked reinforced concrete drawing test pieces with different crack parameters and reinforcing steel bar parameters; wherein the crack parameters comprise crack angles, and the steel bar parameters comprise steel bar diameters; s2, carrying out a pull-out test on the pre-cracked reinforced concrete pull-out test piece through a universal testing machine to obtain a bonding-sliding relation test curve of the reinforcing steel bar and the cracked concrete; s3, characteristic parameters are obtained according to the bond-slip relation test curve, the crack parameters and the steel bar parameters; and S4, according to the characteristic parameters, the bonding-sliding relation between the steel bars and the cracked concrete is constructed. The bond-slip curve of the reinforcing steel bar and the cracked concrete can be well predicted according to the bond-slip relation of the reinforcing steel bar and the cracked concrete, and a basis is provided for analyzing the bond property of the cracked concrete.

The application provides a mechanical property analysis method and system of CFRP grid reinforced concrete, parameters and loading schemes of a stress analysis model of a CFRP grid concrete beam are acquired, a linear softening model is used for a CFRP grid and a concrete interface bonding slip relationship; a known beam with the same height and bearing external bending moment is constructed; in a first stage with a crack bottom width less than a critical crack width, load, crack parameters and stress distribution characteristics in a crack expansion process are calculated according to geometric characteristics, concrete characteristics and CFRP characteristics of the known beam; in a second stage with the crack bottom width greater than or equal to the critical crack width, a force balance equation is described, a relationship between the crack bottom width and the compressive stress of the top of the section is defined, and the load, crack parameters and stress distribution characteristics in the crack expansion process are calculated. The application considers post-cracking tensile stress in the concrete, bonding slip behavior between the CFRP and the concrete, and the result is accurate.

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 invention discloses a method for evaluating a digital twin fiber composite arch reinforced tunnel structure, and relates to the technical field of tunnel health monitoring. A bond slip model and a total stress model are established, a coupling temperature change equation and a coupling humidity change equation are combined, and a damage rate model is constructed; collecting real-time data, calculating the total stress after Gaussian process interpolation processing, calculating the residual life, and primarily evaluating whether to replace or not; when replacement is not needed in primary evaluation, a future state is simulated by using a sequential reasoning network and a finite element method, and the service life is evaluated again to decide whether to replace the lattice reinforced fiber composite arch, so that dynamic evaluation and service life prediction of the lattice reinforced fiber composite arch reinforced tunnel structure are realized, and evaluation accuracy and perspectiveness are improved.

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 steel bar and the calculation method of crack concrete bond-slippage relationship, comprising: S1, by universal testing machine to steel reinforced concrete pull-out test piece is pre-cracked, obtains the pre-cracked steel reinforced concrete pull-out test piece of different crack parameters, steel bar parameters;Wherein crack parameter includes crack angle, steel bar parameter includes steel bar diameter;S2, by universal testing machine to pre-cracked steel reinforced concrete pull-out test piece is pulled out test, obtains the bond-slippage relationship test curve of steel bar and crack concrete;S3, according to bond-slippage relationship test curve, crack parameter, steel bar parameter, obtains characteristic parameter;S4, according to characteristic parameter, the bond-slippage relationship of steel bar and crack concrete is constructed.The bond-slippage relationship of steel bar and crack concrete constructed by the application can be well predicted the bond-slippage curve of steel bar and crack concrete, provides the basis for analyzing the bond performance of crack concrete.

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.