Device and method for testing earthquake-fire coupling mechanical property of building component

Abstract

The invention discloses a building component earthquake-fire coupling mechanical property test device and test method, and relates to the technical field of performance test.The method comprises the steps that a fixed test piece is installed in a high-temperature test furnace, and a temperature test system is determined; installing a vertical loading system and an earthquake loading system; performing a fire resistance test in a high-temperature test furnace to generate a first performance test result; performing an earthquake performance test on the high-temperature test furnace according to the first performance test result to generate a second performance test result; and synchronous recording of test data is performed through the temperature test system, the vertical loading system and the earthquake loading system, and an earthquake-fire coupling mechanical property report of the building component is generated. The technical problems that in the prior art, the testing error is large, the precision is low, and the stress state of the test piece does not accord with the actual working condition are solved, and the technical effects that the test piece load continuity is kept, the testing precision is improved, and the mechanical property of the building component under the earthquake-fire coupling effect is truly reflected are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of performance testing, and particularly to a device and a testing method for testing the seismic-fire coupled mechanical performance of building components. Background Art

[0002] With the development of building engineering technology, the designed service life of building structures is continuously extended, and they may be subjected to disasters such as earthquakes and fires during their service period, and even face complex working conditions of seismic-fire coupling effects. Existing seismic performance tests and fire resistance performance tests of building structures are usually carried out separately. It is necessary to transfer test specimens between different test devices and go through the process of unloading and reloading the load, resulting in a change in the stress state of the test specimens and making it difficult to truly simulate the actual working conditions. This testing method has problems such as difficult quantification of testing errors and inability to guarantee accuracy, and it is difficult to meet the requirements of modern building engineering for high-precision and safety testing. Summary of the Invention

[0003] This application provides a device and a testing method for testing the seismic-fire coupled mechanical performance of building components, which are used to solve the technical problems of large testing errors, low accuracy, and inconsistent stress state of test specimens with actual working conditions in the prior art.

[0004] In view of the above problems, this application provides a device and a testing method for testing the seismic-fire coupled mechanical performance of building components.

[0005] In the first aspect of this application, a device for testing the seismic-fire coupled mechanical performance of building components is provided. The device includes:

[0006] A temperature test system determination module, which is used to install and fix a test specimen in a high-temperature test furnace and determine the temperature test system; a system loading module, which is used to install a vertical loading system and a seismic loading system based on the temperature test system; a fire resistance performance test module, which is used to conduct a fire resistance performance test in the high-temperature test furnace and generate a first performance test result; a seismic performance test module, which is used to conduct a seismic performance test on the high-temperature test furnace according to the first performance test result and generate a second performance test result; a report generation module, which is used to synchronously record test data through the temperature test system, the vertical loading system, and the seismic loading system, and generate a report on the seismic-fire coupled mechanical performance of building components.

[0007] In the second aspect of this application, a method for testing the seismic-fire coupled mechanical performance of building components is provided. The method includes:

[0008] Install and fix the specimen in the high-temperature test furnace, and determine the temperature measurement system; install the vertical loading system and the seismic loading system based on the temperature measurement system; conduct the fire resistance performance test in the high-temperature test furnace to generate the first performance test result; according to the first performance test result, conduct the seismic performance test on the high-temperature test furnace to generate the second performance test result; synchronously record the test data through the temperature measurement system, the vertical loading system and the seismic loading system to generate the seismic-fire coupled mechanical performance report of the building component.

[0009] One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0010] In this application, the specimen is installed and fixed in the high-temperature test furnace, and the temperature measurement system is determined; the vertical loading system and the seismic loading system are installed based on the temperature measurement system; the fire resistance performance test is conducted in the high-temperature test furnace to generate the first performance test result; according to the first performance test result, the seismic performance test is conducted on the high-temperature test furnace to generate the second performance test result; the test data is synchronously recorded through the temperature measurement system, the vertical loading system and the seismic loading system to generate the seismic-fire coupled mechanical performance report of the building component. The present invention solves the technical problems of large test errors, low accuracy, and inconsistent force state of the specimen with the actual working conditions in the prior art. By integrating the temperature measurement system, the vertical loading system and the seismic loading system in the high-temperature test furnace, the synchronous test of fire resistance and seismic performance is realized, and the technical effects of maintaining the load continuity of the specimen, improving the test accuracy and truly reflecting the mechanical performance of the building component under the coupled action of earthquake and fire are achieved. Description of the Drawings

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0012] Figure 1 It is a schematic structural diagram of the seismic-fire coupled mechanical performance test device for building components provided by the embodiment of this application;

[0013] Figure 2 It is a schematic flow diagram of the seismic-fire coupled mechanical performance test method for building components provided by the embodiment of this application;

[0014] Figure 3 It is a seismic-fire coupled mechanical performance test system for building components provided by the embodiment of this application;

[0015] Figure 4The building component seismic-fire coupled mechanical property testing system for performing fire resistance tests provided by the embodiments of the present application.

[0016] Description of reference numerals: Temperature test system determination module 11, system loading module 12, fire resistance test module 13, seismic performance test module 14, report generation module 15, 1 high-temperature test furnace, 2 loading frame support system, 3 vertical loading system, 4 seismic loading system, 5 vertical fixing system, 6 test piece. Detailed implementation manners

[0017] By providing a building component seismic-fire coupled mechanical property testing device and a testing method, the present application aims to solve the technical problems of large testing errors, low precision, and inconsistent stress states of test pieces with actual working conditions in the prior art. By integrating a temperature test system, a vertical loading system, and a seismic loading system in a high-temperature test furnace, synchronous testing of fire resistance and seismic performance is achieved, and the technical effects of maintaining the load continuity of test pieces, improving testing precision, and truly reflecting the mechanical properties of building components under seismic-fire coupled actions are achieved.

[0018] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0019] It should be noted that any variations of the terms "include" and "have" are intended to cover non-exclusive inclusions. For example, a process, method, device, product, or server including a series of steps or units does not necessarily have to be limited to those clearly listed steps or units, but may include other steps or modules not clearly listed or inherent to these processes, methods, products, or devices.

[0020] Embodiment 1, as Figure 1 、 Figure 3 and Figure 4 shown, the embodiments of the present application provide a building component seismic-fire coupled mechanical property testing device, and the device includes:

[0021] A temperature test system determination module 11, configured to install and fix a test piece in a high-temperature test furnace and determine a temperature test system.

[0022] In the embodiment of the present application, the temperature test system determination module 11 is used to install and fix the test piece in a high-temperature test furnace and determine the temperature test system. The process first vertically fixes the test piece to the loading frame support system through a vertical fixing system to generate first installation data; then restricts the horizontal displacement of the test piece through a horizontal fixing system to generate second installation data; finally, integrates the installation state of the test piece according to the first installation data and the second installation data to determine the temperature test system, providing basic support for subsequent fire resistance tests and seismic performance tests.

[0023] Further, in the device provided in the embodiment of the application, the temperature test system determination module 11 is further used for:

[0024] Vertically fix the fixed test piece to the loading frame support system in the high-temperature test furnace through a vertical fixing system to generate first installation data; restrict the horizontal displacement of the fixed test piece through a horizontal fixing system to generate second installation data; perform installation integration on the fixed test piece according to the first installation data and the second installation data to determine the temperature test system.

[0025] In the embodiment of the present application, the vertical fixing system refers to a device used to vertically fix the test piece to the loading frame support system in the high-temperature test furnace. Its main function is to ensure that the test piece does not have vertical displacement or tilt during the test. When vertically fixing the fixed test piece to the loading frame support system in the high-temperature test furnace through the vertical fixing system, use high-strength bolts or clamps to firmly connect the bottom of the test piece to the loading frame support system, and at the same time calibrate the verticality of the test piece through a laser level or an electronic spirit level to ensure that it is completely perpendicular to the loading frame support system. After installation, record the initial installation position, fixing method, and verticality data of the test piece to generate first installation data.

[0026] The horizontal fixing system refers to a device used to restrict the horizontal displacement of the test piece. Its main function is to prevent the test piece from shifting or becoming unstable in the horizontal direction during the test. The specific installation method is to install adjustable horizontal support rods or limiting devices on both sides or around the test piece, and ensure the stability of the test piece in the horizontal direction by tightening the bolts or adjusting the length of the support rods. After installation, use a displacement sensor or a laser rangefinder to detect the horizontal displacement of the test piece to ensure that it meets the test requirements. Record the installation parameters, limiting range, and initial displacement data of the horizontal fixing device to generate second installation data.

[0027] Finally, perform installation integration on the fixed test piece according to the first installation data and the second installation data to obtain the temperature test system. On this basis, arrange multiple temperature sensors at preset positions on the surface of the test piece to ensure their uniform distribution and coverage of key areas; at the same time, configure a data acquisition unit to record temperature data in real time; finally, calibrate the temperature test system to ensure that its measurement accuracy meets the standard.

[0028] The system loading module 12 is used to install the vertical loading system and the seismic loading system based on the temperature test system.

[0029] In the embodiment of the present application, the system loading module 12 configures and completes the integration and debugging of the vertical loading system and the seismic loading system based on the installation of the temperature test system. Specifically, first, the vertical jack and the vertical jack support slide plate are integrated on the top of the loading frame support system. The load value applied by the vertical jack is precisely adjusted through the servo control system to generate the third installation data, and the installation of the vertical loading system is completed based on this data. Then, the horizontal actuator is connected to the fixed specimen, and the seismic waveform parameters are set through the seismic loading controller to generate the fourth installation data, and the installation of the seismic loading system is completed based on this data.

[0030] Furthermore, in the device provided by the embodiment of the application, the system loading module 12 is further used for:

[0031] Integrate the vertical jack and the vertical jack support slide plate on the top of the loading frame support system, adjust the load value applied by the vertical jack through the servo control system to generate the third installation data; obtain the installed vertical loading system according to the third installation data; connect the horizontal actuator to the fixed specimen, and set the seismic waveform parameters through the seismic loading controller to generate the fourth installation data; obtain the installed seismic loading system according to the fourth installation data.

[0032] In the embodiment of the present application, first, the vertical jack and the vertical jack support slide plate are integrated on the top of the loading frame support system. The vertical jack is a hydraulic device for applying vertical loads, and the vertical jack support slide plate is used to ensure the smooth movement of the jack during loading. The load value applied by the vertical jack is adjusted through the servo control system, and the servo control system monitors and adjusts the magnitude and rate of the load in real time to ensure that the load is evenly applied to the specimen. Through this step, the third installation data is generated, including information such as the installation position of the jack, the load value, and the loading rate. According to the third installation data, the system loading module 12 completes the installation of the vertical loading system, providing a basis for the mechanical property test of the specimen in the vertical direction.

[0033] Next, connect the horizontal actuator to the fixed specimen. The horizontal actuator is a device used to apply horizontal loads and can simulate dynamic loads under seismic actions. Set the seismic waveform parameters through the seismic loading controller, which can generate and control parameters such as the frequency, amplitude, and duration of the seismic waveform to simulate seismic actions of different intensities. Through this step, the fourth installation data is generated, including information such as the installation position of the actuator, seismic waveform parameters, and loading mode. According to the fourth installation data, the system loading module 12 completes the installation of the seismic loading system, providing technical support for the mechanical property test of the specimen under seismic actions.

[0034] Through the above steps, the system loading module 12 realizes the configuration and debugging of the vertical loading system and the seismic loading system. Combining with the temperature data of the temperature test system, it can comprehensively evaluate the mechanical properties and seismic resistance of the specimen in a high-temperature environment.

[0035] The fire resistance test module 13 is used to conduct fire resistance tests in a high-temperature test furnace and generate the first performance test results.

[0036] In the embodiment of the present application, the fire resistance test module 13 is used to conduct fire resistance tests in a high-temperature test furnace and generate the first performance test results through real-time monitoring and dynamic regulation. In the heating-up stage, the high-temperature test furnace is monitored in real time through the temperature test system to obtain the temperature distribution data inside the furnace, and a temperature curve is drawn based on these data to obtain the temperature rise performance test results; in the cooling-down stage, continue to monitor the temperature change data inside the furnace in real time through the temperature test system, and use the closed-loop control system for dynamic compensation to ensure that the cooling process is stable and conforms to the preset curve, thereby obtaining the temperature drop performance test results; finally, integrate the temperature rise performance test results with the temperature drop performance test results to obtain the first performance test results.

[0037] Furthermore, in the device provided by the embodiment of the application, the fire resistance test module 13 is further used for:

[0038] Based on real-time monitoring of the high-temperature test furnace through the temperature test system in the heating-up stage, obtain the temperature distribution data inside the furnace; draw a temperature curve according to the temperature distribution data inside the furnace, and adjust the heating power of the high-temperature test furnace based on the temperature curve to obtain the temperature rise performance test results; based on real-time monitoring of the high-temperature test furnace through the temperature test system in the cooling-down stage, obtain the temperature change data inside the furnace; perform dynamic compensation through the closed-loop control system in combination with the temperature change data inside the furnace to obtain the temperature drop performance test results; add the temperature rise performance test results and the temperature drop performance test results to the first performance test results.

[0039] In the embodiment of the present application, during the heating-up stage, the high-temperature test furnace is monitored in real time through a temperature test system (a monitoring device integrating sensors such as thermocouples and infrared thermometers) to obtain the temperature distribution data inside the furnace. Data acquisition technology is used to record the temperature changes at different positions. Based on these data, a temperature curve is plotted, and the heating power of the high-temperature test furnace is adjusted through a temperature control system (a device capable of precisely adjusting the heating power) to ensure that the heating process conforms to the preset curve, thereby obtaining the temperature distribution data inside the furnace.

[0040] Based on the obtained temperature distribution data inside the furnace, a temperature curve is plotted using data analysis software (such as MATLAB) to analyze the heating rate and temperature uniformity. According to the preset heating curve (such as the ISO 834 standard curve), the heating power of the high-temperature test furnace is dynamically adjusted through a temperature control system (such as a PID controller). This step adopts closed-loop control technology to ensure that the temperature inside the furnace precisely follows the preset curve, thereby obtaining the test results of the temperature rise performance. The test results of the temperature rise performance include the temperature distribution data inside the furnace, the temperature-time curve, the heating rate, etc.

[0041] During the cooling-down stage, the temperature change data inside the furnace is continuously monitored in real time through the temperature test system. The thermocouple and the infrared thermometer continuously collect temperature information to obtain the temperature change data inside the furnace.

[0042] Next, based on the temperature change data during the cooling-down stage, dynamic compensation is performed through a closed-loop control system. Specifically, the output power of the cooling equipment is adjusted in real time according to the temperature change. At the same time, the vertical load applied to the specimen is dynamically adjusted through a servo control system (such as a hydraulic or electric loading system) to keep the vertical load unchanged. This step adopts dynamic compensation technology to ensure the stability of the vertical load, and finally obtains the test results of the temperature drop performance. The test results of the temperature drop performance include the temperature change data inside the furnace, the temperature-time curve (during the cooling-down stage), the cooling rate, the dynamic compensation data, etc.

[0043] Finally, the test results of the temperature rise performance and the test results of the temperature drop performance are integrated into the first performance test results.

[0044] The seismic performance test module 14 is used to perform a seismic performance test on the high-temperature test furnace according to the first performance test results and generate the second performance test results.

[0045] In the embodiment of the present application, based on the first performance test results, the seismic performance test module 14 real-time feedbacks and adjusts the vertical load data through the servo control system to determine the output pressure of the vertical jack. At the same time, the I-shaped steel structure of the loading frame support system is used to disperse the seismic horizontal force. Finally, the output pressure data and the horizontal force dispersion results are integrated to generate the second performance test results.

[0046] Further, in the device provided by the application embodiment, the seismic performance test module 14 is further configured to:

[0047] According to the first performance test result, activate the servo control system, perform real-time feedback on the vertical load data through the servo control system, and obtain a feedback result; adjust the pressure of the vertical jack according to the feedback result to determine the output pressure data of the vertical jack; apply a seismic horizontal force, and disperse the seismic horizontal force through the I-shaped steel structure of the loading frame support system to obtain a horizontal force dispersion result; add the output pressure data and the horizontal force dispersion result to the second performance test result.

[0048] In the embodiment of the present application, first, activate the servo control system. This system uses high-precision pressure sensors and displacement sensors to monitor the load change of the vertical jack in real time, and uses a closed-loop control algorithm (such as PID control) to automatically adjust the load to ensure that the vertical load of the specimen remains stable before and after the seismic loading, and prevent test errors caused by sudden changes in the stress conditions. In this step, the servo control system calculates the real-time feedback value of the vertical load and obtains a feedback result, that is, the deviation data between the actual vertical force borne by the current specimen and the theoretical loading value.

[0049] Next, according to the feedback result, adjust the hydraulic pressure of the vertical jack through the electro-hydraulic servo system. The vertical jack is a hydraulic loading device, and the hydraulic oil inside it adjusts the output pressure through a high-precision pressure control valve. The servo control system adjusts the pressure of the hydraulic oil according to the feedback value to ensure that the vertical load is consistent with the theoretical value, thereby obtaining the output pressure data of the vertical jack.

[0050] After the vertical loading adjustment is completed, enter the seismic loading stage. At this time, the seismic loading controller sets the seismic waveform parameters, including amplitude, frequency, acceleration, and duration, and drives the horizontal actuator to apply a seismic horizontal force. The horizontal actuator is an electro-hydraulic driven dynamic loading device, and different seismic waveform signals are input through the computer control system to simulate the stress conditions of the building structure under different seismic intensities. During the loading process, high-precision accelerometers and displacement sensors monitor the movement trajectory of the actuator in real time to ensure that the loading waveform conforms to the preset seismic parameters.

[0051] Subsequently, the I-shaped steel structure of the loading rack support system begins to disperse the horizontal seismic force. The I-shaped steel structure is a load-bearing structure with high strength and large flexural stiffness. It can convert the concentrated load into a distributed load through its own material properties and geometric structure. In this step, the strain gauges and force sensors are used to monitor the stress conditions at various positions of the I-shaped steel, obtain the strain data at different points, and combine the finite element analysis method to calculate the actual distribution of the horizontal force. Finally, the horizontal force dispersion result is generated to ensure the uniform stress of the specimen under the action of the horizontal seismic force and avoid failure caused by local overload.

[0052] Finally, the output pressure data of the vertical jack and the horizontal force dispersion result are integrated to form the second performance test result.

[0053] The report generation module 15 is used to synchronously record the test data through the temperature test system, the vertical loading system and the seismic loading system, and generate the seismic-fire coupled mechanical performance report of the building component.

[0054] In the embodiment of the present application, the test data is synchronously recorded through the temperature test system, the vertical loading system and the seismic loading system. The temperature-time data and the fixed specimen deformation data are extracted based on the first performance test result, the load-displacement curve is extracted based on the second performance test result, and these data are analyzed by correlation to generate the fire resistance limit data and the seismic performance data. Subsequently, the bearing capacity degradation coefficient and the residual deformation index are obtained through decay calculation, and the test data is integrated and analyzed based on these decay factors. Finally, the key parameters such as temperature, load, deformation and performance degradation are comprehensively processed to generate the seismic-fire coupled mechanical performance report of the building component.

[0055] Furthermore, in the device provided by the embodiment of the application, the report generation module 15 is further used for:

[0056] Based on the first performance test result, extract the temperature-time data and the fixed specimen deformation data; based on the second performance test result, extract the load-displacement curve; perform correlation analysis on the temperature-time data, the fixed specimen deformation data, and the load-displacement curve to generate a correlation analysis result, and the correlation analysis result includes the fire resistance limit data and the seismic performance data; based on the correlation analysis result, perform decay calculation on the fixed specimen to obtain decay factors, and the decay factors include the bearing capacity degradation coefficient and the residual deformation index; integrate the fire resistance limit data and the seismic performance data according to the bearing capacity degradation coefficient and the residual deformation index to generate the seismic-fire coupled mechanical performance report of the building component.

[0057] In the embodiment of the present application, first, based on the first performance test result, temperature-time data is extracted from the temperature test system. This data is used to record the temperature change of the test piece in the high-temperature environment in real time through a thermocouple, an infrared thermometer, and a data acquisition system, reflecting the thermal response of the test piece material. At the same time, the deformation data of the fixed test piece is obtained from the vertical loading system. This data is collected by measuring devices such as displacement sensors and strain gauges and is used to characterize the deformation and mechanical degradation of the test piece under high temperature.

[0058] Subsequently, based on the second performance test result, a load-displacement curve is extracted from the seismic loading system. This data is recorded through a force sensor, an accelerometer, and a displacement measurement system, reflecting the mechanical characteristics and dynamic response of the test piece under seismic loads.

[0059] After the data extraction is completed, correlation analysis is carried out, that is, the temperature-time data, the deformation data of the fixed test piece, and the load-displacement curve are fused to study the mechanical characteristics of building components under the coupled action of earthquake and fire. Specifically, first, the Lagrange interpolation method is used to align the temperature data and the deformation data in time to ensure the synchronization of the temperature field and the mechanical field data. Then, principal component analysis is combined to reduce the dimension of the data, enabling different physical quantities to be compared and analyzed in the same feature space. In addition, multiple linear regression analysis is used to establish the functional relationship among temperature, deformation, and load to calculate the performance degradation characteristics of building components under fire and earthquake actions. In the stage of generating the correlation analysis result, based on the fire resistance limit determination standard (such as GB / T9978), the fire resistance limit data of the test piece is calculated, that is, the critical time or temperature at which the test piece fails under high temperature. At the same time, an earthquake resistance performance evaluation method based on energy dissipation is adopted to calculate the earthquake resistance performance data of the test piece, including the maximum deformation, hysteretic energy dissipation, and stiffness degradation curve. Through this process, the correlation analysis result is generated, and the correlation analysis result includes the fire resistance limit data and the earthquake resistance performance data.

[0060] Subsequently, based on the results of the correlation analysis, the mechanical degradation degree of the specimen is further evaluated, and its degradation factor is calculated, including the bearing capacity degradation coefficient and the residual deformation index. The calculation process of the bearing capacity degradation coefficient first extracts the peak bearing capacity data of the fixed specimen from the second performance test results, that is, the maximum bearing capacity of the specimen under seismic loads. Then, the peak bearing capacity of the fixed specimen without fire action is set as the control group, and the peak bearing capacity data of the specimen is compared with the data of the control group to calculate the degradation ratio of its bearing capacity. Next, the seismic impact is calculated by comparing the degradation ratio with the integral value of the temperature-time data to quantify the influence degree of fire on the seismic performance of the specimen, and finally the bearing capacity degradation coefficient is obtained. At the same time, the residual deformation index is used to evaluate the permanent deformation remaining in the building component after the coupled action of earthquake and fire, so as to characterize its deformation recovery ability and structural safety. The calculation of this index first records the initial position of the specimen before seismic loading and the final position of the specimen under the unloaded state after the earthquake through displacement sensors, laser rangefinders or DIC digital image correlation technology. Subsequently, the residual deformation of the specimen is calculated, that is, the displacement difference between the final position and the initial position, and this is used as the residual deformation index.

[0061] Finally, the fire resistance limit data and the seismic performance data are integrated according to the bearing capacity degradation coefficient and the residual deformation index to generate a report on the coupled mechanical performance of the building component under earthquake and fire. The integration method is to normalize each item of data and calculate the safety level of the building component according to the structural safety assessment standard (such as ISO834). Finally, a data visualization tool (such as MATLAB) is used to plot the temperature-time curve, the load-displacement curve and the bearing capacity degradation trend, and intuitively display the performance changes of the specimen in the form of charts to generate a report on the coupled mechanical performance of the building component under earthquake and fire.

[0062] Furthermore, in the device provided by the application embodiment, the report generation module 15 is further used for:

[0063] Extracting the peak bearing capacity data of the fixed specimen from the second performance test results; setting the peak bearing capacity of the fixed specimen without fire action as the control group, comparing the peak bearing capacity data with the control group to determine the degradation ratio; performing seismic impact calculation according to the degradation ratio and the integral value of the temperature-time data to obtain the bearing capacity degradation coefficient.

[0064] In the embodiment of the present application, first, the peak bearing capacity data of the fixed specimen is extracted from the second performance test results, that is, the maximum bearing capacity of the specimen under seismic action.

[0065] Next, to evaluate the impact of fire on seismic performance, the peak bearing capacity of the fixed specimens without fire exposure is set as the control group. The data of the control group is sourced from the test results of the same specimens under the same seismic conditions but without experiencing fire, thus serving as a benchmark for comparison. By comparing the peak bearing capacity of the specimens after fire with that of the control group, the degradation ratio can be calculated, which represents the decline in the bearing capacity of the specimens.

[0066] Finally, based on the calculated degradation ratio, the seismic impact calculation is further carried out. This step quantifies the impact degree of fire on the seismic performance of the specimens through a mathematical model. The core method is to calculate the cumulative impact of fire by combining the integral value of temperature-time data. First, the temperature-time data of the specimens under fire is recorded using a temperature measurement system and numerical integration is performed. Among them, O is the cumulative temperature impact, T(t) is the temperature of the specimen at different time points, and t0 and t f are the start time and end time of the fire action respectively. Subsequently, a functional relationship between the cumulative temperature impact of fire and the bearing capacity degradation ratio is established through mathematical regression analysis, and the final bearing capacity degradation coefficient is calculated to quantify the impact degree of fire on the seismic performance of building components.

[0067] In the embodiments of the present application, in summary, the embodiments of the present application have at least the following technical effects:

[0068] In the present application, the specimen is installed and fixed in a high-temperature test furnace, and a temperature measurement system is determined; a vertical loading system and a seismic loading system are installed based on the temperature measurement system; a fire resistance performance test is carried out in the high-temperature test furnace to generate a first performance test result; according to the first performance test result, a seismic performance test is carried out on the high-temperature test furnace to generate a second performance test result; the test data is synchronously recorded through the temperature measurement system, the vertical loading system and the seismic loading system to generate a seismic-fire coupling mechanical performance report of building components. The present invention solves the technical problems of large test errors, low precision and inconsistent stress state of specimens with actual working conditions in the prior art. By integrating a temperature measurement system, a vertical loading system and a seismic loading system in a high-temperature test furnace, the synchronous test of fire resistance and seismic performance is realized, achieving the technical effects of maintaining the load continuity of specimens, improving the test precision and truly reflecting the mechanical performance of building components under seismic-fire coupling action.

[0069] Embodiment 2, based on the same inventive concept as the seismic-fire coupling mechanical performance test device for building components in the foregoing embodiment, as Figure 2 shown, the embodiments of the present application provide a method for testing the seismic-fire coupling mechanical performance of building components, which includes:

[0070] Step 1: Install and fix the test piece in the high-temperature test furnace and determine the temperature measurement system; Step 2: Install the vertical loading system and the seismic loading system based on the temperature measurement system; Step 3: Conduct the fire resistance performance test in the high-temperature test furnace to generate the first performance test result; Step 4: According to the first performance test result, conduct the seismic performance test on the high-temperature test furnace to generate the second performance test result; Step 5: Synchronously record the test data through the temperature measurement system, the vertical loading system and the seismic loading system to generate the seismic-fire coupling mechanical performance report of the building component.

[0071] Further, when installing and fixing the test piece in the high-temperature test furnace and determining the temperature measurement system, the method further includes:

[0072] Vertically fix the fixed test piece to the loading frame support system in the high-temperature test furnace through the vertical fixing system to generate the first installation data; limit the horizontal displacement of the fixed test piece through the horizontal fixing system to generate the second installation data; install and integrate the fixed test piece according to the first installation data and the second installation data to determine the temperature measurement system.

[0073] Further, when installing the vertical loading system and the seismic loading system based on the temperature measurement system, the method further includes:

[0074] Integrate the vertical jack and the vertical jack support slide plate at the top of the loading frame support system, and adjust the load value applied by the vertical jack through the servo control system to generate the third installation data; obtain the installed vertical loading system according to the third installation data; connect the horizontal actuator to the fixed test piece and set the seismic waveform parameters through the seismic loading controller to generate the fourth installation data; obtain the installed seismic loading system according to the fourth installation data.

[0075] Further, when conducting the fire resistance performance test in the high-temperature test furnace to generate the first performance test result, the method further includes:

[0076] Based on the heating stage, conduct real-time monitoring of the high-temperature test furnace through the temperature measurement system to obtain the temperature distribution data inside the furnace; draw a temperature curve according to the temperature distribution data inside the furnace, and adjust the heating power of the high-temperature test furnace based on the temperature curve to obtain the temperature rise performance test result; based on the cooling stage, conduct real-time monitoring of the high-temperature test furnace through the temperature measurement system to obtain the temperature change data inside the furnace; perform dynamic compensation through the closed-loop control system in combination with the temperature change data inside the furnace to obtain the temperature drop performance test result; add the temperature rise performance test result and the temperature drop performance test result to the first performance test result.

[0077] Further, according to the first performance test result, a seismic performance test is carried out on the high-temperature test furnace to generate a second performance test result. The method further includes:

[0078] According to the first performance test result, activate the servo control system, perform real-time feedback on the vertical load data through the servo control system to obtain a feedback result; adjust the pressure of the vertical jack according to the feedback result to determine the output pressure data of the vertical jack; apply a seismic horizontal force, and disperse the seismic horizontal force through the I-shaped steel structure of the loading frame support system to obtain a horizontal force dispersion result; add the output pressure data and the horizontal force dispersion result to the second performance test result.

[0079] Further, through the temperature test system, the vertical loading system and the seismic loading system, synchronous recording of test data is carried out to generate a seismic-fire coupled mechanical performance report of the building component. The method further includes:

[0080] Based on the first performance test result, extract temperature-time data and fixed specimen deformation data; based on the second performance test result, extract the load-displacement curve; perform correlation analysis on the temperature-time data, the fixed specimen deformation data and the load-displacement curve to generate a correlation analysis result, and the correlation analysis result includes fire resistance limit data and seismic performance data; based on the correlation analysis result, perform degradation calculation on the fixed specimen to obtain a degradation factor, and the degradation factor includes a bearing capacity degradation coefficient and a residual deformation index; integrate the fire resistance limit data and the seismic performance data according to the bearing capacity degradation coefficient and the residual deformation index to generate the seismic-fire coupled mechanical performance report of the building component.

[0081] Further, for the calculation process of the bearing capacity degradation coefficient, the method further includes:

[0082] Extract the peak bearing capacity data of the fixed specimen in the second performance test result; set the peak bearing capacity of the fixed specimen without fire action as a control group, compare the peak bearing capacity data with the control group to determine the degradation ratio; perform seismic influence calculation according to the degradation ratio and the integral value of the temperature-time data to obtain the bearing capacity degradation coefficient.

[0083] It should be noted that the above sequence of embodiments of the present application is only for description and does not represent the superiority or inferiority of the embodiments. And the above describes specific embodiments of this specification. The processes depicted in the drawings do not necessarily require the specific order and continuous order shown to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0084] The above are only the preferred embodiments of the present application, and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

[0085] This specification and the drawings are merely exemplary descriptions of the present application and are considered to cover any and all modifications, variations, combinations, or equivalents within the scope of the present application. Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the present application and its equivalent technologies, the present application is intended to include these changes and modifications therein.

Claims

1. Seismic-fire coupled mechanical property testing device for building components, characterized in that, The device includes: A temperature test system determination module, configured to install and fix a specimen in a high-temperature test furnace and determine the temperature test system; A system loading module, configured to install a vertical loading system and a seismic loading system based on the temperature test system; A fire resistance performance test module, configured to conduct a fire resistance performance test in the high-temperature test furnace and generate a first performance test result; A seismic performance test module, configured to conduct a seismic performance test on the high-temperature test furnace according to the first performance test result and generate a second performance test result; A report generation module, configured to synchronously record test data through the temperature test system, the vertical loading system, and the seismic loading system, and generate a seismic-fire coupled mechanical performance report of a building component.

2. The test device for the seismic-fire coupling mechanical properties of building components according to claim 1, characterized in that, Installing and fixing a specimen in a high-temperature test furnace and determining the temperature test system includes: Vertically fixing the fixed specimen to a loading frame support system in the high-temperature test furnace through a vertical fixing system to generate first installation data; Restricting the horizontal displacement of the fixed specimen through a horizontal fixing system to generate second installation data; Performing installation integration on the fixed specimen according to the first installation data and the second installation data to determine the temperature test system.

3. The seismic-fire coupled mechanical property testing device for building components according to claim 1, characterized in that Installing a vertical loading system and a seismic loading system based on the temperature test system includes: Integrating a vertical jack and a vertical jack support slide plate at the top of the loading frame support system, and adjusting the load value applied by the vertical jack through a servo control system to generate third installation data; Obtaining the vertically installed loading system that is completed according to the third installation data; Connecting a horizontal actuator to the fixed specimen and setting seismic waveform parameters through a seismic loading controller to generate fourth installation data; Obtaining the installed seismic loading system that is completed according to the fourth installation data.

4. The testing device for the seismic-fire coupled mechanical properties of building components according to claim 1, characterized in that, Conducting a fire resistance performance test in the high-temperature test furnace and generating a first performance test result includes: Based on the heating stage, performing real-time monitoring on the high-temperature test furnace through the temperature test system to obtain the temperature distribution data inside the furnace; Drawing a temperature curve according to the temperature distribution data inside the furnace, and adjusting the heating power of the high-temperature test furnace based on the temperature curve to obtain a temperature rise performance test result; Based on the cooling stage, performing real-time monitoring on the high-temperature test furnace through the temperature test system to obtain the temperature change data inside the furnace; Performing dynamic compensation through a closed-loop control system in combination with the temperature change data inside the furnace to obtain a temperature drop performance test result; Adding the temperature rise performance test result and the temperature drop performance test result to the first performance test result.

5. The device for testing the seismic-fire coupled mechanical properties of building components according to claim 3, characterized in that, Conducting a seismic performance test on the high-temperature test furnace according to the first performance test result and generating a second performance test result includes: According to the first performance test result, activating the servo control system, and performing real-time feedback on the vertical load data through the servo control system to obtain a feedback result; Adjusting the pressure of the vertical jack according to the feedback result to determine the output pressure data of the vertical jack; Loading a seismic horizontal force, and dispersing the seismic horizontal force through the I-shaped steel structure of the loading frame support system to obtain a horizontal force dispersion result; Add the output pressure data and the horizontal force dispersion result to the second performance test result.

6. The seismic-fire coupled mechanical property testing device for building components according to claim 1, wherein Through the temperature test system, the vertical loading system, and the seismic loading system, synchronously record the test data to generate a seismic-fire coupled mechanical performance report of the building component, including: Based on the first performance test result, extract the temperature-time data and the fixed specimen deformation data. Extract the load-displacement curve based on the second performance test result. Perform correlation analysis on the temperature-time data, the fixed specimen deformation data, and the load-displacement curve to generate a correlation analysis result, which includes fire resistance limit data and seismic performance data. Based on the correlation analysis result, perform degradation calculation on the fixed specimen to obtain a degradation factor, which includes a bearing capacity degradation coefficient and a residual deformation index. Integrate the fire resistance limit data and the seismic performance data according to the bearing capacity degradation coefficient and the residual deformation index to generate the seismic-fire coupled mechanical performance report of the building component.

7. The seismic-fire coupled mechanical property testing device for building components according to claim 6, wherein The calculation process of the bearing capacity degradation coefficient includes: Extract the peak bearing capacity data of the fixed specimen in the second performance test result. Set the peak bearing capacity of the fixed specimen without fire action as the control group, compare the peak bearing capacity data with the control group to determine the degradation ratio. Perform seismic influence calculation according to the degradation ratio and the integral value of the temperature-time data to obtain the bearing capacity degradation coefficient.

8. Test method for seismic-fire coupling mechanical properties of building components, characterized in that, The method is executed by the seismic-fire coupled mechanical performance test device of the building component described in any one of claims 1 to 7, including: Install and fix the specimen in the high-temperature test furnace to determine the temperature test system. Install the vertical loading system and the seismic loading system based on the temperature test system. Conduct fire resistance performance test in the high-temperature test furnace to generate the first performance test result. According to the first performance test result, conduct seismic performance test on the high-temperature test furnace to generate the second performance test result. Through the temperature test system, the vertical loading system, and the seismic loading system, synchronously record the test data to generate a seismic-fire coupled mechanical performance report of the building component.

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