Device and method for detecting mechanical property of nuclear island structure contact surface

Abstract

The invention relates to the technical field of nuclear island structure testing, and provides a nuclear island structure contact surface mechanical property detection device and method. Comprising a vibration table, a second plant model arranged on the table top of the vibration table in a pouring mode, a first plant model arranged on the second plant model in a pouring mode and a sensor unit arranged on the first plant model and / or the second plant model, and the sensor unit is at least used for obtaining mechanical parameters. By pouring the first plant model on the second plant model, the device can truly reproduce the contact relation of pouring first and pouring later and the interface forms of concrete-concrete and concrete-steel plates, and the vibration table is used for applying earthquake dynamic load and can be integrated with a weighting device, a temperature control system and the like to realize a static load-temperature-dynamic coupling test.

Description

Technical Field

[0001] This invention relates to the field of nuclear island structure testing technology, and in particular to a device and method for testing the mechanical properties of the contact surface of a nuclear island structure. Background Technology

[0002] In the actual construction of nuclear island structure buildings, a method of pouring concrete layer by layer (segmented and layered construction) is often adopted to form large reinforced concrete raft slabs, foundations, and bottom components. Due to the sequential nature of the construction, interface contact relationships often form between the pre-cast and post-cast parts of the building.

[0003] Currently, there are several unresolved or poorly understood issues regarding the mechanical behavior of the aforementioned contact interfaces. The effects of frictional slippage, interface cracking and re-contact processes, surface roughness, and construction contact conditions (wetting, roughness, uncleaned interface layer, etc.) on shear stiffness and energy dissipation capacity of concrete-concrete interfaces under complex loads (especially cyclic seismic loads) lack a systematic and quantitative description. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a device and method for testing the mechanical properties of the contact surface of a nuclear island structure, so as to simulate and test the mechanical properties of the contact surface of a nuclear island structure.

[0005] To achieve the above and other related objectives, this invention proposes a device for testing the mechanical properties of the contact surface of a nuclear island structure, comprising:

[0006] Vibration table;

[0007] The second factory model was cast and set on the platform of the vibration table;

[0008] The first factory building model was cast and installed on the second factory building model;

[0009] A sensor unit is disposed in the first factory model and / or the second factory model, and the sensor unit is used to acquire at least mechanical parameters.

[0010] In one specific embodiment of the present invention, the sensor unit includes a three-dimensional force sensor.

[0011] In one specific embodiment of the present invention, the triaxial force sensor includes a plurality of first triaxial force sensors disposed at the bottom of the second factory model, wherein one of the first triaxial force sensors is disposed at the center of the bottom of the second factory model.

[0012] In one specific embodiment of the present invention, the remaining first three-dimensional force sensors are arranged in a ring array with the bottom center of the second factory model as the reference.

[0013] In a specific embodiment of the present invention, the triaxial force sensor includes a plurality of second triaxial force sensors, which are disposed inside the outer wall of the second factory building model.

[0014] In a specific embodiment of the present invention, the sensor unit includes a plurality of first temperature sensors, which are disposed at the bottom of the first factory model. The plurality of first temperature sensors are arranged in a circular array with the bottom center of the first factory model as a reference, and the first temperature sensors are located in the middle of the bottom thickness direction of the first factory model.

[0015] In a specific embodiment of the present invention, the sensor unit includes a plurality of second temperature sensors, which are disposed at the bottom of the second factory model. The plurality of second temperature sensors are arranged in a ring array with the bottom center of the second factory model as a reference, and the second temperature sensors are located in the middle of the bottom thickness direction of the second factory model.

[0016] In one specific embodiment of the present invention, the sensor unit includes a plurality of third temperature sensors, which are disposed on the outer circular wall of the first factory model, and the third temperature sensors are located at the middle part of the thickness direction of the outer circular wall.

[0017] In one specific embodiment of the present invention, the sensor unit includes at least two thermometers, which are disposed in the cavity inside the first factory model.

[0018] In one specific embodiment of the present invention, a heating system is further included, which is used to heat the internal cavity of the first factory model.

[0019] In a specific embodiment of the present invention, the heating system includes a heating fan, and a vent is provided on the first factory model. The heating fan is connected to the vent through a heating pipe.

[0020] This invention also proposes a method for testing the mechanical properties of the contact surface of a nuclear island structure, applied to the aforementioned testing device for the mechanical properties of the contact surface of a nuclear island structure, comprising the following steps:

[0021] The second factory building model and the first factory building model were sequentially cast on the vibration table, and the sensors were installed thereon.

[0022] The mechanical performance testing device for the contact surface of the nuclear island structure is activated, and mechanical parameters are acquired through the sensor unit.

[0023] The performance of the nuclear island structure is obtained based on the mechanical parameters.

[0024] The beneficial effects of this invention are as follows: by casting the first factory building model onto the second factory building model, the contact relationship between pre-cast and post-cast concrete and the interface forms of concrete-concrete and concrete-steel plate can be realistically reproduced. Seismic dynamic loads can be applied by relying on the shaking table. At the same time, it can be integrated with the weighting device, temperature control system, etc. to realize the coupling test of static load-temperature-dynamic. The sensor unit collects parameters such as force, displacement, acceleration, strain, contact pressure, and temperature in real time, and quantitatively characterizes key indicators such as interface normal stress, tangential friction force, shear stiffness, stiffness degradation and hysteresis energy. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the mechanical performance testing device for the contact surface of the nuclear island structure in one embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the first building model of the nuclear island structure contact surface mechanical performance testing device in one embodiment of the present invention;

[0028] Figure 3 This is a cross-sectional view of the first and second factory models of the nuclear island structure contact surface mechanical performance testing device in one embodiment of the present invention.

[0029] Figure 4 This is a schematic diagram of the heating system of the nuclear island structure contact surface mechanical property testing device in one embodiment of the present invention.

[0030] Explanation of reference numerals in the attached drawings: 10, Vibration table; 20, First workshop model; 21, Vent; 30, Second workshop model; 41, First triaxial force sensor; 42, Second triaxial force sensor; 51, First temperature sensor; 52, Second temperature sensor; 53, Third temperature sensor; 54, Thermometer; 60, Heating fan; 70, Heating pipe. Detailed Implementation

[0031] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0032] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0033] In the actual construction of nuclear island structures, a layer-by-layer pouring method (segmented and layered construction) is often used to form large reinforced concrete raft slabs, foundations, and bottom components. Due to the sequential nature of the construction, interfaces often form between the pre-cast and post-cast sections of the buildings. In the absence of interlocking reinforcement bars, the reinforced concrete raft slabs of adjacent buildings (commonly circular or near-circular raft slabs in engineering) directly support each other and transfer loads through the contact surfaces. This contact relationship can be further subdivided into two categories: concrete-concrete contact interfaces and concrete-steel plate contact interfaces. Furthermore, in terms of geometry and stress form, it can be distinguished into different types such as "contact side interface" (lateral or vertical contact surface) and "contact bottom interface" (bottom surface contact).

[0034] Under service conditions, the mechanical behavior of the aforementioned contact interfaces is influenced by the coupling effects of various operating conditions: seismic (dynamic) forces cause relative slippage, impact contact, periodic opening and closing, and frictional energy dissipation at the interface; temperature fields (seasonal or operational temperature differences) cause inconsistent thermal expansion between adjacent bodies, generating additional contact pressure or a tendency to crack; static loads (self-weight, dead load, live load, and operational loads) determine the load transfer path and stress state of the pressure zone through the distribution of contact pressure. These various loads are not independent but alter the interface state through coupling effects (for example, temperature differences can reduce the interface normal pressure, thereby increasing the probability of slippage during earthquakes; local indentations under static loads can change the coefficient of friction and shear capacity, etc.).

[0035] Currently, several unresolved or poorly understood issues exist regarding the mechanical behavior of the aforementioned contact interfaces: The effects of frictional slippage, interface cracking and re-contact processes, and the influence of surface roughness and construction contact conditions (wetting, roughness, uncleaned interface layers, etc.) on shear stiffness and energy dissipation capacity at concrete-concrete contact interfaces under complex loads (especially cyclic seismic loads) lack systematic quantitative description. Concrete-steel plate contact interfaces involve local buckling, differences in steel plate stiffness, contact stress concentration, and a combined friction-bond force transmission mechanism; their interface degradation patterns under temperature changes and cyclic loads are also unclear. Since no continuous reinforcing bars are used during construction, the contact points cannot rely on the through-restraint provided by lapped reinforcing bars. Load transfer mainly relies on contact compressive stress, friction, and interface bonding. Therefore, the nonlinearity, gaps, local interlocking, and contact surface condition of the interface become weak points in the overall structural performance.

[0036] In terms of numerical simulation and engineering analysis, although finite element software already provides methods such as contact elements, friction models, interface springs, and bond-failure for interface modeling, there are still several challenges in modeling large circular raft-plate direct contact systems such as nuclear island buildings. First, the nonlinearity of the contact interface (opening and closing, slippage, contact surface friction degradation, local crushing) and multi-field coupling (dynamic-temperature-static load) require high-precision time history analysis and high-resolution meshes, resulting in high computational costs and parameter sensitivity. Second, existing interface constitutive models (simplified friction-slip models, linear spring models, or empirical bond models) often fail to simultaneously capture hysteresis characteristics, stiffness degradation, and cumulative slip under cyclic loading. Third, the side and bottom interfaces have fundamental differences in stress forms, contact pressure distribution, and boundary conditions, making it difficult for a single unified model to account for the physical mechanisms of both. Fourth, model parameters (interface friction coefficient, bond strength, contact roughness scale, local indentation modulus, etc.) depend on the on-site construction quality and material state, and there is currently a lack of systematic experimental data and calibration methods for this type of contact (especially circular raft slabs resting on each other without through reinforcement).

[0037] like Figure 1-4As shown, to achieve the above-mentioned and other related objectives, this invention proposes a device for testing the mechanical properties of the contact surface of a nuclear island structure, including a vibration table 10, a first factory model 20, a second factory model 30, and a sensor unit. The vibration table 10 is a 4m×4m test platform, equipped with an electro-hydraulic servo actuator control system connected to the vibration table 10, with 4 actuators arranged in the horizontal and 4 in the vertical directions, enabling the vibration table 10 to achieve translational motion along the X, Y, and Z axes and rotational deformation around the three axes. The shaking table 10 can generate various waveforms such as simple harmonic vibration, triangular wave, square wave, pulse wave, seismic wave, and random wave to most realistically simulate the actual ground motion of the building's bottom surface under earthquake action and reproduce the dynamic deformation process of the building during an earthquake. The second factory building model 30 is cast and set on the shaking table 10, and the first factory building model 20 is cast and set on the second factory building model 30. Sensor units are arranged on the first factory building model 20 and / or the second factory building model 30 to acquire mechanical parameters, thereby conducting experiments on the pre-cast-post-cast contact relationship and interface mechanical behavior under controllable boundary and loading conditions.

[0038] This device can directly simulate the pre-cast-post-cast contact structure in nuclear island structures. Under controlled dynamic excitation, it can reproduce the relative slippage, opening and closing, impact contact, and failure development process caused by seismic action. It can obtain key mechanical parameters such as force, displacement, acceleration, strain, and contact force, and quantitatively characterize the interface force transmission and deformation characteristics, as well as its hysteresis, stiffness degradation, and energy dissipation laws. Through variable waveforms and multi-condition loading, it can also be used to study the failure evolution and even collapse mechanism of structures, providing reliable experimental basis and engineering data for the calibration of interface constitutive models, verification of finite element models, evaluation of structural seismic performance, optimization of construction technology, and research in related disciplines.

[0039] like Figure 2 As shown, in a specific embodiment of the present invention, the sensor unit adopts a triaxial force sensor to simultaneously measure force components in three orthogonal directions (i.e., one direction is the interface positive force or normal component, and the other two directions are the interface two tangential / shear components). This sensor can be arranged at the contact surface between the first plant model 20 and the second plant model 30, or in a locally reserved weak point, insert, or force measuring seat on the contact surface. It needs to be sealed and protected and calibrated before casting, and its data is collected synchronously and calibrated over time with other sensors such as acceleration, displacement, and strain through a signal conditioning and data acquisition system. Single-point multi-directional deployment or array deployment can be used to obtain local and global force distribution information of the contact surface, and temperature compensation and impact resistance design can be combined to adapt to combined working conditions under static load, temperature field, and strong earthquake. The triaxial force sensor can directly and quantitatively acquire the time history and cyclic response of the interface normal pressure and the tangential friction / shear force in two directions, and completely record the impact, slippage, adhesion-detachment, hysteresis and mechanical degradation processes, which is convenient for identifying the opening and closing of the contact state, the initiation and development of slippage, local indentation and changes in the friction coefficient.

[0040] like Figure 2 As shown, in a specific embodiment of the present invention, the triaxial force sensor consists of multiple first triaxial force sensors 41, all arranged at the bottom of the second workshop model 30, wherein at least one first triaxial force sensor 41 is set at the center of the bottom to obtain information on the overall reaction force and the central response; the selected model is a 3KD124 type triaxial force sensor. The sensor can be installed in a prefabricated force base or insert before pouring, and is completely integrated with the concrete through a metal or engineering plastic base plate, sealed and protected, and with lead-out conduits reserved to ensure reliable operation throughout the pouring, curing and testing processes. During installation, it is necessary to ensure that the sensor's mounting reference plane is aligned with the global coordinate system and complete calibration and temperature compensation. After conditioning, the sensor signal is synchronously connected to the data acquisition system along with other acceleration, displacement, and strain sensors. The sampling frequency and range are set according to the seismic dynamics and impact characteristics to meet the composite measurement requirements of transient impact, cyclic hysteresis, and low-frequency static load. By deploying a multi-point sensor array at the bottom and setting a separate sensor at the center, local and global triaxial force component data can be acquired simultaneously, providing an experimental basis for the local-global mapping of the mechanical behavior of the contact surface.

[0041] like Figure 2 As shown, in a specific embodiment of the present invention, the remaining first three-dimensional force sensors 41 are arranged in a ring array with the bottom center of the second factory model 30 as the reference. There are five groups of first three-dimensional force sensors 41. One group of first three-dimensional force sensors 41 is located at the bottom center of the second factory model, and the other four groups are arranged in a circular trajectory outside the central first three-dimensional force sensor 41. In this embodiment, the first three-dimensional force sensors 41 are arranged in an array of five groups with the bottom center of the second factory model 30 as the reference—one group is located at the bottom center, and the other four groups are arranged in a ring trajectory with equal angular intervals (90°) outside the central sensor. The ring radius can be determined according to the model size and the required spatial resolution. The central plus ring multi-point three-dimensional force measurement arrangement can simultaneously obtain overall reaction force information and surrounding distribution details. The central sensor reflects the resultant force, vertical reaction force concentration, and torque changes. The four points in the ring can reveal the uneven distribution of contact pressure, eccentric load, rotational and shear force transmission paths, and the bottom contact pressure field and resultant force displacement center (pressure center) can be reconstructed through interpolation or inversion methods.

[0042] like Figure 2As shown, in a specific embodiment of the present invention, the triaxial force sensor further includes four sets of second triaxial force sensors 42 (model 3KA98), which are embedded in different positions inside the outer wall of the second factory model 30 to obtain the triaxial dynamic force components (normal axial force and two tangential / lateral components) within the wall. Each set of sensors is fixed in the wall template and integrated with the concrete through pre-embedded force measuring seats or inserts. During installation, the sensor coordinate system is aligned with the global coordinate system, and sealing protection, temperature compensation, and calibration are completed. After the sensor signals are processed by an impact-resistant conditioner, they are synchronously connected to the data acquisition system along with other sensors on the bottom of the platform and on the first factory model 20. The sampling rate and range are set according to the characteristics of seismic dynamics, impact, and cyclic loading, and can simultaneously record the triaxial force time history under transient impact, periodic hysteresis, and low-frequency static load, thereby establishing a spatiotemporally consistent mechanical monitoring network between the wall, raft, and adjacent bodies.

[0043] like Figure 3 As shown, in a specific embodiment of the present invention, the sensor unit includes a plurality of first temperature sensors 51, which are disposed at the bottom of the first factory model 20. The plurality of first temperature sensors 51 are arranged in a circular array with the center of the bottom of the first factory model 20 as a reference, and the first temperature sensors 51 are located in the middle of the thickness direction of the bottom of the first factory model 20. In this embodiment, there are 10 groups of first temperature sensors 51, arranged in a circular array with the center of the bottom of the first factory model 20 as a reference, and the sensor head is 5 cm from the bottom surface of the concrete. This temperature sensing arrangement can achieve precise measurement of the temperature field in the circumferential direction and the middle of the thickness of the raft slab, obtain the heat release and temperature gradient during the curing period, the temperature difference distribution under operating or experimental conditions and its time evolution, and then use it to calculate the thermal expansion deformation and additional stress caused by temperature, and quantify the influence of temperature difference on the normal stress, friction state and relative slip of the contact interface.

[0044] like Figure 3 As shown, in a specific embodiment of the present invention, the sensor unit includes a plurality of second temperature sensors 52, which are disposed at the bottom of the second factory model 30. The plurality of second temperature sensors 52 are arranged in a ring array with the center of the bottom of the second factory model 30 as a reference, and the second temperature sensors 52 are located in the middle of the thickness direction of the bottom of the second factory model 30. In this embodiment, 12 second temperature sensors 52 are provided, arranged in a ring array with the center of the bottom of the second factory model 30 as a reference, and the temperature sensor head is approximately 5 cm from the bottom surface of the concrete. This ring-shaped multi-point temperature arrangement can accurately obtain the spatiotemporal temperature field distribution and temperature gradient at the bottom of the second factory model 30, revealing the temperature difference evolution under curing exothermic, operational, or experimental conditions, and providing direct data for calculating thermal expansion deformation and the additional stress, interface normal stress changes, and friction state caused by temperature differences.

[0045] like Figure 3 As shown, in a specific embodiment of the present invention, the sensor unit includes a plurality of third temperature sensors 53, which are disposed on the outer circular wall of the first factory model 20. The third temperature sensors 53 are located in the middle of the outer circular wall in the thickness direction. In this embodiment, two third temperature sensors 53 are disposed and embedded inside the outer circular wall of the first factory model 20, with the sensor temperature head located about 5 cm from the outer surface of the concrete. Temperature monitoring in the middle of the outer circular wall can provide circumferential and radial temperature field information on the outer side of the wall, revealing the temperature gradient and thermal hysteresis under curing exothermic conditions and operating / testing conditions. This can be used to evaluate the thermal expansion deformation and additional stress caused by temperature difference, determine the influence of temperature on the normal stress and friction state of the wall-raft and wall-adjacent interface, and identify temperature-induced crack initiation or material performance degradation.

[0046] The first, second and third temperature sensors 53 are all vibration-resistant nose-type temperature sensors. The sensor head is a nose-type structure, which can achieve close thermal contact with concrete through a press-in or embedded measuring base. Furthermore, damping filling, sealing potting and flexible stress buffer structure are used between the temperature head and the sensor body to reduce the impact of vibration transmission and mechanical stress on the temperature sensing element.

[0047] like Figure 3 As shown, in a specific embodiment of the present invention, the sensor unit further includes at least two thermometers 54, which are arranged in the internal cavity of the first workshop model 20 for directly measuring the temperature of the gas or lining inside the cavity. The selected thermometers 54 may be high-precision probes such as thermocouples or platinum resistance thermometers (RTDs).

[0048] like Figure 4 As shown, in a specific embodiment of the present invention, a heating system is also included, which is used to heat the internal cavity of the first plant model 20. The heating system can adopt distributed electric heating elements (heating belts / heating pads / heating tubes) or circulating hot fluid heating devices, and is equipped with an insulation layer, a temperature sensing feedback loop, and electrical / thermal protection devices. Arranging thermometers 54 and matching the heating system in the internal cavity of the first plant model 20 can achieve precise control and repeatable loading of the internal temperature environment of the model, meeting the needs of simulating concrete curing heat release, operating temperature fields, or accident / operational high-temperature conditions. Controlled heating can artificially generate or amplify temperature gradients and thermal expansion effects, thereby enabling the experiment to examine the influence of the temperature field on the normal stress of the contact interface, friction state, relative slip, crack initiation, and material property degradation; real-time temperature measurement is used for closed-loop control and temperature compensation of heating, ensuring the controllability of thermo-mechanical coupling test conditions and the consistency of data.

[0049] In one specific embodiment of the present invention, the heating system uses a 5kW rated power heating fan 60 as the heat source, which is connected to a vent 21 reserved on the side wall of the first workshop model 20 through a heating pipe 70. The diameter / opening width of the vent 21 is 50mm. The heating fan 60 and the pipe form a forced convection heating circuit. Hot air enters the cavity inside the model through the vent 21 and forms a circulation. Multiple temperature sensors are arranged inside the cavity to measure the temperature field of different parts in real time. The temperature signal is connected to a digital display controller (which can realize PID or timed heating curve control). The controller is used to set the target temperature (e.g., 150℃), heating rate and holding time, and adjusts the fan air volume and heating power according to the multi-point temperature feedback to achieve a controllable heating process.

[0050] This invention also proposes a method for testing the mechanical properties of the contact surface of a nuclear island structure, applied to the aforementioned testing device for the mechanical properties of the contact surface of a nuclear island structure, comprising the following steps:

[0051] S1. On the vibrating table 10, the base of the second factory model 30 is poured in sequence and sensor holes are reserved. After the concrete has initially set, the first and second type three-dimensional force sensors, temperature sensors and other sensing elements are installed in the reserved holes. Cement mortar or compatible repair materials are used to seal and fill the holes and ensure that the interface is flat. After the strength of the sealing material and the base reaches about 70% (or according to the strength threshold required by the design), the first factory model 20 is poured after overall acceptance and alignment. The sensor installation and sealing process of the first factory model 20 is the same as that of the second factory model 30.

[0052] S2. Start the mechanical performance testing device of the contact surface of the nuclear island structure and obtain mechanical parameters through the sensor unit; according to the preset sampling frequency and test program (including static load, quasi-static load, dynamic excitation or earthquake simulation input), synchronously obtain mechanical and thermal parameters such as triaxial force, acceleration, displacement, strain and multi-point temperature through the data acquisition system.

[0053] S3. Obtain the nuclear island structure performance based on the mechanical parameters. Subsequently, the raw data is filtered, temperature compensated, coordinate transformed, and calibrated to form a parameter set that can be directly used for mechanical analysis, so as to facilitate further performance evaluation and model verification.

[0054] In summary, this invention, by combining an array of three-dimensional force sensors (embedded in the bottom center and ring, and multiple points within the wall) and a multi-point pressure nose temperature sensor, a cavity thermometer 54, and a controllable heating system (5kW heating fan 60, 50mm vent 21, digital display closed-loop control) deployed at the pre-casting-post-casting contact interface on the vibration table 10, and employing a data acquisition scheme involving pre-embedding, calibration, temperature compensation, and synchronous sampling during the casting process, can accurately obtain the interface normal force and biaxial tangential force, contact pressure field, displacement / acceleration / strain time history under controllable and repeatable dynamic and thermo-mechanical coupling conditions. The system obtains spatiotemporal temperature field information, thereby realistically reproducing the relative slippage, opening and closing, impact contact, hysteresis characteristics, stiffness degradation, energy dissipation, and damage evolution processes of the contact interface under seismic loading. Based on multi-point redundant measurements, it can realize the mapping of local-to-global mechanical response and pressure field reconstruction, improve data robustness, and facilitate early damage diagnosis. The obtained multi-field time series data provides reliable experimental basis for interface constitutive parameter inversion, finite element model calibration, failure mechanism research, and seismic performance evaluation. At the same time, it supports the optimization of construction technology, verification of temperature control / heating schemes, and quantitative evaluation of reinforcement design, significantly improving the controllability, reproducibility, and engineering applicability of the test.

[0055] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

[0056] Throughout this description, numerous specific details, such as examples of components and / or methods, are provided to provide a complete understanding of embodiments of the invention. However, those skilled in the art will recognize that embodiments of the invention may be practiced without one or more of these specific details or by other devices, systems, components, methods, parts, materials, components, etc. In other instances, well-known structures, materials, or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the invention.

Claims

1. A device for testing the mechanical properties of the contact surface of a nuclear island structure, characterized in that, include: Vibration table; The second factory model was cast and set on the platform of the vibration table; The first factory building model was cast and installed on the second factory building model; A sensor unit is disposed in the first factory model and / or the second factory model, and the sensor unit is used to acquire at least mechanical parameters.

2. The device for testing the mechanical properties of the contact surface of the nuclear island structure according to claim 1, characterized in that, The sensor unit includes a three-dimensional force sensor.

3. The device for testing the mechanical properties of the contact surface of the nuclear island structure according to claim 2, characterized in that, The triaxial force sensor includes multiple first triaxial force sensors disposed at the bottom of the second factory building model, one of which is disposed at the center of the bottom of the second factory building model.

4. The device for testing the mechanical properties of the contact surface of the nuclear island structure according to claim 3, characterized in that, The remaining first three-dimensional force sensors are arranged in a ring array with the bottom center of the second factory model as the reference.

5. The device for testing the mechanical properties of the contact surface of the nuclear island structure according to claim 2, characterized in that, The triaxial force sensor includes multiple second triaxial force sensors, which are installed inside the outer wall of the second factory building model.

6. The device for testing the mechanical properties of the contact surface of the nuclear island structure according to claim 1, characterized in that, The sensor unit includes multiple first temperature sensors, which are disposed at the bottom of the first factory model. The multiple first temperature sensors are arranged in a ring array with the bottom center of the first factory model as a reference, and the first temperature sensors are located in the middle of the bottom thickness direction of the first factory model.

7. The device for testing the mechanical properties of the contact surface of the nuclear island structure according to claim 1, characterized in that, The sensor unit includes multiple second temperature sensors, which are disposed at the bottom of the second factory model. The multiple second temperature sensors are arranged in a ring array with the bottom center of the second factory model as a reference, and the second temperature sensors are located in the middle of the bottom thickness direction of the second factory model.

8. The device for testing the mechanical properties of the contact surface of the nuclear island structure according to claim 1, characterized in that, The sensor unit includes multiple third temperature sensors, which are disposed on the outer circular wall of the first factory building model. The third temperature sensors are located at the middle of the outer circular wall in the thickness direction.

9. The device for testing the mechanical properties of the contact surface of the nuclear island structure according to claim 1, characterized in that, The sensor unit includes at least two thermometers, which are disposed in the cavity inside the first factory model.

10. The device for testing the mechanical properties of the contact surface of the nuclear island structure according to claim 1, characterized in that, It also includes a heating system for heating the internal cavity of the first factory building model.

11. The device for testing the mechanical properties of the contact surface of the nuclear island structure according to claim 10, characterized in that, The heating system includes a heating fan, and a vent is provided on the first factory model. The heating fan is connected to the vent through a heating pipe.

12. A method for testing the mechanical properties of the contact surface of a nuclear island structure, characterized in that, The device for testing the mechanical properties of the contact surface of a nuclear island structure as described in any one of claims 1-11 includes the following steps: The second factory building model and the first factory building model were sequentially cast on the vibration table, and the sensors were installed thereon. The mechanical performance testing device for the contact surface of the nuclear island structure is activated, and mechanical parameters are acquired through the sensor unit. The performance of the nuclear island structure is obtained based on the mechanical parameters.

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