Steel-concrete interface mechanical properties testing device under multiple working conditions throughout the life cycle

Abstract

The invention discloses a steel-concrete interface mechanical property testing device under full life cycle and multiple working conditions, including a support base assembly, a normal loading assembly and a tangential loading assembly; the support base assembly is used to respectively support and fix the first steel plate and the second steel plate of the steel-concrete to-be-tested piece; the normal loading assembly is used to be connected to the first steel plate and the second steel plate respectively, to apply a normal load to the steel-concrete to-be-tested piece and to heat the interface of the steel-concrete to-be-tested piece; the tangential loading assembly is used to be fixedly connected to the concrete, to apply a tangential load to the steel-concrete to-be-tested piece, and the tangential load is a unidirectional load, a repeated load, a long-term load and an impact load applied during the full life cycle of the steel-concrete to-be-tested piece. The device has high stability and accuracy, and is suitable for testing the mechanical properties of the steel-concrete interface under various working conditions such as long-term loads, repeated actions, fires, and impacts during the full life cycle of the simulated structure.

Description

Technical Field

[0001] The invention relates to the technical field of steel-concrete interface mechanical performance testing, and in particular to a steel-concrete interface mechanical performance testing device under full life cycle and multiple working conditions. Background Art

[0002] Steel and concrete are the two most widely used materials in structural engineering. Steel-concrete composite structures generally refer to structures composed of steel and concrete, and the two work together. Composite structures have the characteristics of good mechanical properties and convenient construction. They have been widely used in high-rise building structures, large-span structures and bridge structures. Reliable force transmission at the steel-concrete interface is the basis for ensuring their joint work.

[0003] In the study of the mechanical properties of steel-concrete composite structures throughout their life cycle, the study of the mechanical properties of the steel-concrete interface is the basis for analyzing the working mechanism of the two materials. During the entire life cycle of the structure, it may be subjected to short-term loads, long-term loads, earthquakes, fires, impacts and other working conditions. It is necessary to conduct interface mechanical properties tests under corresponding working conditions to analyze the interface bonding-slip performance and ensure the safety of the structure.

[0004] At present, there are the following problems in the test of the mechanical properties of the steel-concrete interface: the irregular geometry of the specimen surface has a great influence on the tangential shear performance, which can easily affect the stability and accuracy of the results; the normal load has a great influence on the tangential shear performance of the interface, and the influence of the normal load needs to be considered in the test device; the temperature has a significant effect on the bonding performance of the interface, and the influence of temperature needs to be considered in the test device; the tangential load is mainly unidirectional load, and the influence of various working conditions throughout the life cycle of the structure is less considered, making it difficult to conduct interface mechanical properties tests under conditions such as repeated loads, long-term loads and impact loads. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present invention is to provide a steel-concrete interface mechanical properties testing device under multiple working conditions throughout the life cycle, which has high stability and accuracy and is suitable for testing the mechanical properties of the steel-concrete interface under various working conditions such as long-term load, repeated action, fire, impact, etc. during the life cycle of the simulated structure.

[0006] The steel-concrete interface mechanical properties testing device under full life cycle and multiple working conditions according to an embodiment of the present invention is used to perform interface mechanical properties testing on a steel-concrete test piece, wherein the steel-concrete test piece is mainly composed of concrete and a first steel plate and a second steel plate located on opposite sides of the concrete;

[0007] The steel-concrete interface mechanical properties testing device under multiple working conditions during the whole life cycle includes:

[0008] A support base assembly, the support base assembly is used to support and fix the first steel plate and the second steel plate respectively, so that the concrete is in a suspended state;

[0009] A normal loading assembly, the normal loading assembly being used to be connected to the first steel plate and the second steel plate respectively, to apply a normal load to the steel-concrete test piece and to heat the interface of the steel-concrete test piece to change the interface temperature of the steel-concrete test piece;

[0010] A tangential loading component is used to be fixedly connected to the concrete to apply a tangential load to the steel-concrete test piece, wherein the tangential load is a unidirectional load, a repeated load, a long-term load and an impact load applied to the steel-concrete test piece during its entire life cycle.

[0011] According to the device for testing the mechanical properties of the steel-concrete interface under multiple working conditions over the entire life cycle according to the embodiment of the present invention, on the one hand, the normal loading component and the tangential loading component cooperate to facilitate the application of loads according to the test requirements to test the tangential shear performance of the test piece; on the other hand, the support base component, the normal loading component, and the tangential loading component constrain the steel-concrete test piece to ensure the relative movement of the steel-concrete interface along the tangential direction, which is conducive to obtaining stable and accurate interface mechanical properties test results; at the same time, since the influence of the normal load can be considered, the influence of the temperature can be considered, and the influence of tangential loads such as unidirectional loads, repeated loads, long-term loads and impact loads can be considered, therefore, it can be suitable for testing the mechanical properties of the steel-concrete interface under various working conditions such as long-term loads, repeated actions, fires, impacts, etc. over the entire life cycle of the simulated structure.

[0012] According to one embodiment of the present invention, the support base assembly includes a base, a first panel and a second panel; the first panel and the second panel are fixed on the base relative to each other and spaced apart from each other; the first panel is provided with a first groove for supporting and fixing the first steel plate, and the second panel is provided with a second groove for supporting and fixing the second steel plate; the first panel is provided with a first hole connected to the first groove, and the second panel is provided with a second hole connected to the second groove, and the normal loading assembly passes through the first hole and the second hole respectively to be connected to the first steel plate and the second steel plate.

[0013] According to a further embodiment of the present invention, the support base assembly also includes a first reinforcing rib and a second reinforcing rib; the first reinforcing rib is respectively fixed to the base and the first panel and faces away from the second panel; the second reinforcing rib is respectively fixed to the base and the second panel and faces away from the first panel.

[0014] According to a further embodiment of the present invention, the normal loading assembly includes a first heating plate, a normal actuator, a second heating plate and a clamping member; the first heating plate is located in the first hole but is not fixed to the first panel, the first heating plate is fixedly connected to the first steel plate, and the loading end of the normal actuator is fixedly connected to the first heating plate; the second heating plate is located in the second hole and is fixed to the second panel, the second heating plate is fixedly connected to the second steel plate, and one end of the clamping member is fixedly connected to the second heating plate.

[0015] According to a further embodiment of the present invention, the first heating plate and the first steel plate are fixed together, and the second heating plate and the second steel plate are fixed together by screws.

[0016] According to some embodiments of the present invention, the normal loading assembly also includes a first end plate, a second end plate and a first connecting member; the first end plate and the second end plate are arranged relatively spaced apart, the first end plate is connected to the fixed end of the normal actuator, the second end plate is fixed to the other end of the clamping member, and the first end plate and the second end plate are fixed by the first connecting member.

[0017] According to a further embodiment of the present invention, the first connecting member is a cross bar, and two ends of the cross bar respectively pass through the first end plate and the second end plate and are respectively fixed by first nuts.

[0018] According to a further embodiment of the present invention, both the first heating plate and the second heating plate include a heating plate resistance wire and a heating plate outer frame, and the heating plate resistance wire is arranged inside the heating plate outer frame.

[0019] According to one embodiment of the present invention, the tangential loading assembly includes a tangential actuator, a first clamp, a second clamp and a second connecting member; the loading end of the tangential actuator is fixed to the first clamp, the first clamp and the second clamp are respectively located on opposite sides of the concrete and are used to clamp the concrete, and the first clamp and the second clamp are fixed by the second connecting member.

[0020] According to a further embodiment of the present invention, the second connecting member is a screw rod, and two ends of the screw rod respectively pass through the first clamping plate and the second clamping plate and are respectively fixed by second nuts.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0023] Figure 1 It is a schematic structural diagram of a device for testing the mechanical properties of a steel-concrete interface under multiple working conditions throughout the entire life cycle according to an embodiment of the present invention.

[0024] Figure 2 It is a structural schematic diagram of the support base assembly of the steel-concrete interface mechanical properties testing device under full life cycle and multiple working conditions according to an embodiment of the present invention.

[0025] Figure 3 Schematic diagram of the connection structure between the normal loading assembly and the steel-concrete test piece of the steel-concrete interface mechanical properties testing device under full life cycle and multiple working conditions in an embodiment of the present invention.

[0026] Figure 4 Schematic diagram of the connection structure between the tangential loading assembly and the steel-concrete test piece of the steel-concrete interface mechanical properties testing device under full life cycle and multiple working conditions in an embodiment of the present invention.

[0027] Figure 5 It is a schematic cross-sectional view of the structure of the first heating plate or the second heating plate of the steel-concrete interface mechanical properties testing device under multiple working conditions during the whole life cycle according to an embodiment of the present invention.

[0028] Reference numerals:

[0029] Full life cycle and multiple working conditions steel-concrete interface mechanical properties test device 1000

[0030] Steel-concrete test piece 1 Concrete 101 First steel plate 102 Second steel plate 103

[0031] Support base assembly 2

[0032] Base 201

[0033] First panel 202 First groove 2021 First hole 2022

[0034] Second panel 203 Second groove 2031 Second hole 2032

[0035] First reinforcement rib 204 Second reinforcement rib 205

[0036] Normal Loading Component 3

[0037] First heating plate 301 Heating plate resistance wire I Heating plate outer frame II

[0038] Normal actuator 302 Second heating plate 303 Fastening member 304 Screw 305

[0039] First end plate 306 Second end plate 307 First connecting member 308

[0040] First nut 309

[0041] Tangential loading component 4

[0042] Tangential actuator 401 First clamping plate 402 Second clamping plate 403

[0043] Second connecting member 404 Second nut 405 DETAILED DESCRIPTION

[0044] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0045] Combine the following Figures 1 to 5 The steel-concrete interface mechanical properties testing device 1000 under full life cycle and multiple working conditions according to an embodiment of the present invention is described.

[0046] like Figures 1 to 4 As shown, the steel-concrete interface mechanical properties testing device 1000 under full life cycle and multiple working conditions of the embodiment of the present invention is used to test the interface mechanical properties of a steel-concrete test piece 1, wherein the steel-concrete test piece 1 is mainly composed of concrete 101 and a first steel plate 102 and a second steel plate 103 located on opposite sides of the concrete 101. For example, Figure 1 and Figure 3 As shown, the first steel plate 102 is located on the right side of the concrete 101 , and the second steel plate 103 is located on the left side of the concrete 101 . There is a bonding interface between the first steel plate 102 and the concrete 101 , and between the second steel plate 103 and the concrete 101 .

[0047] The steel-concrete interface mechanical properties testing device 1000 under full life cycle and multiple working conditions according to an embodiment of the present invention includes a support base assembly 2, a normal loading assembly 3 and a tangential loading assembly 4.

[0048] The support base assembly 2 is used to support and fix the first steel plate 102 and the second steel plate 103 respectively, so that the concrete 101 is in a suspended state, which is convenient for the tangential loading assembly 4 to apply a tangential load to the concrete 101.

[0049] The normal loading assembly 3 is used to be connected to the first steel plate 102 and the second steel plate 103 respectively, to apply a normal load to the steel-concrete test piece 1 and to heat the interface of the steel-concrete test piece 1 to change the interface temperature of the steel-concrete test piece 1. It can be understood that the normal loading assembly 3 is located in the normal direction of the steel-concrete test piece 1 (see Figure 1 In the left and right directions), the normal loading component 3 is connected with the first steel plate 102 and the second steel plate 103. On the one hand, it can apply normal pressure to the steel-concrete test piece 1 to make the steel-concrete test piece 1 in a compressive state in the normal direction, and it can also apply normal tension to the steel-concrete test piece 1 to make the steel-concrete test piece 1 in a tensile state in the normal direction; on the other hand, the interface temperature of the steel-concrete test piece 1 can be changed by heating, so as to simulate the fire effect in the whole life cycle of the structure.

[0050] The tangential loading assembly 4 is used to be fixedly connected to the concrete 101 to apply a tangential load to the steel-concrete test piece 1. The tangential load is a unidirectional load, a repeated load, a long-term load, and an impact load applied to the steel-concrete test piece 1 during its entire life cycle. It can be understood that the tangential loading assembly 4 is located in the tangential direction of the steel-concrete test piece 1 (for example, see Figure 1 The tangential loading assembly 4 is fixedly connected to the concrete 101 in the up and down directions, and can apply corresponding tangential loads according to test requirements, for example, unidirectional loads, repeated loads, long-term loads and impact loads, etc., wherein the unidirectional load can be a pressure applied to the concrete 101 from top to bottom, or a tensile force applied to the concrete 101 from bottom to top; the repeated load can be first applying pressure to the concrete 101, then pulling the concrete 101 back, and then applying pressure to the concrete 101, and so on repeatedly; the long-term load can be a tangential load applied to the concrete 101 continuously for a long time; the impact load can be a tangential load applied to the concrete 101 in a very short time.

[0051] According to the device 1000 for testing the mechanical properties of the steel-concrete interface under multiple working conditions during the entire life cycle according to the embodiment of the present invention, on the one hand, the normal loading component 3 and the tangential loading component 4 cooperate to facilitate the application of loads according to the test requirements to test the tangential shear performance of the test piece; on the other hand, the support base component 2 and the normal loading component 3 and the tangential loading component 4 constrain the steel-concrete test piece 1 to ensure the relative movement of the steel-concrete 101 interface along the tangential direction, which is conducive to obtaining stable and accurate interface mechanical properties test results; at the same time, since the influence of normal loads, the influence of temperature, and the influence of tangential loads such as unidirectional loads, repeated loads, long-term loads and impact loads can be considered, the device can be applied to the mechanical properties test of the steel-concrete 101 interface under various working conditions such as long-term loads, repeated actions, fires, and impacts during the entire life cycle of the simulated structure.

[0052] like Figure 1 and Figure 2 As shown, according to one embodiment of the present invention, the support base assembly 2 includes a base 201, a first panel 202 and a second panel 203. The first panel 202 and the second panel 203 are fixed on the base 201 with a relative spacing therebetween. The first panel 202 and the second panel 203 are arranged with a spacing therebetween to provide a receiving space for the steel-concrete test piece 1. The first panel 202 and the second panel 203 are fixed on the base 201 to make the structure of the support base assembly 2 stable. The first panel 202 is provided with a first groove 2021 for supporting and fixing the first steel plate 102, and the second panel 203 is provided with a second groove 2031 for supporting and fixing the second steel plate 103; that is, the steel-concrete test piece 1 can be arranged between the first panel 202 and the second panel 203, the first steel plate 102 of the steel-concrete test piece 1 can be adaptively fixed in the first groove 2021, and the second steel plate 103 of the steel-concrete test piece 1 can be adaptively fixed in the second groove 2031. In practical applications, the size of the first groove 2021 and the size of the second groove 2031 can be slightly larger than the size of the steel-concrete test piece 1 accordingly. The first panel 202 is provided with a first hole 2022 connected to the first groove 2021, and the second panel 203 is provided with a second hole 2032 connected to the second groove 2031. The normal loading component 3 passes through the first hole 2022 and the second hole 2032 respectively to be connected to the first steel plate 102 and the second steel plate 103. That is to say, by providing the first hole 2022 and the second hole 2032, it is convenient for the normal loading component 3 to be connected to the first steel plate 102 and the second steel plate 103 respectively in the normal direction, so that the normal loading component 3 can apply a normal load to the steel-concrete test piece 1, including applying a pressure load and a tensile load.

[0053] According to a further embodiment of the present invention, the support base assembly 2 further includes a first reinforcing rib 204 and a second reinforcing rib 205. The first reinforcing rib 204 is fixed to the base 201 and the first panel 202 respectively and faces away from the second panel 203 to ensure the stability of the first panel 202. The second reinforcing rib 205 is fixed to the base 201 and the second panel 203 respectively and faces away from the first panel 202 to ensure the stability of the second panel 203.

[0054] like Figure 1 , Figure 2 and Figure 3 As shown, according to one embodiment of the present invention, the normal loading assembly 3 includes a first heating plate 301 , a normal actuator 302 , a second heating plate 303 and a fastening member 304 . The first heating plate 301 is located in the first hole 2022 but is not fixed to the first panel 202 (fixed here means that the first heating plate 301 can move relative to the first panel 202), the first heating plate 301 is fixedly connected to the first steel plate 102, and the loading end of the normal actuator 302 is fixedly connected to the first heating plate 301; thus, the normal actuator 302 mainly plays the role of applying load; the first heating plate 301 is rigidly connected and fixed to the first steel plate 102, and the normal load can be transferred to the steel-concrete test piece 1; the first heating plate 301 can also heat the steel-concrete test piece 1 according to the test requirements, and change the interface temperature of the steel-concrete test piece 1 to simulate the fire condition; in addition, in actual application, the size of the first hole 2022 is adapted to the size of the first heating plate 301, and the size of the first hole 2022 is not less than the size of the first heating plate 301 and the size of the steel-concrete test piece 1. The second heating plate 303 is located in the second hole 2032 and is fixed to the second panel 203. The second heating plate 303 is fixedly connected to the second steel plate 103. One end of the abutting piece 304 is fixedly connected to the second heating plate 303. Thus, by setting the abutting piece 304, it is beneficial to constrain the steel-concrete test piece 1. The second heating plate 303 is rigidly connected and fixed to the second steel plate 103, so as to realize the transmission of normal force. The second heating plate 303 can also heat the steel-concrete test piece 1 according to the test requirements, and change the interface temperature of the steel-concrete test piece 1 to simulate the fire condition. In addition, in actual application, the size of the second hole 2032 is adapted to the size of the second heating plate 303, and the size of the second hole 2032 is not less than the size of the second heating plate 303 and the size of the steel-concrete test piece 1.

[0055] According to a further embodiment of the present invention, the first heating plate 301 and the first steel plate 102 are fixed, and the second heating plate 303 and the second steel plate 103 are fixed by screws 305. In this way, the first heating plate 301 and the first steel plate 102, and the second heating plate 303 and the second steel plate 103 are firmly connected, and force transmission can be achieved.

[0056] According to some embodiments of the present invention, the normal loading assembly 3 further includes a first end plate 306, a second end plate 307 and a first connecting member 308; the first end plate 306 and the second end plate 307 are arranged relatively spaced apart, the first end plate 306 is connected to the fixed end of the normal actuator 302, the second end plate 307 is fixed to the other end of the abutting member 304, and the first end plate 306 and the second end plate 307 are fixed by the first connecting member 308. By providing the first end plate 306, the second end plate 307 and the first connecting member 308, the stability of the structure is increased.

[0057] Preferably, the first connecting member 308 is a cross bar, and the two ends of the cross bar respectively pass through the first end plate 306 and the second end plate 307 and are respectively fixed by the first nut 309, thereby, the structure is simple and easy to disassemble and assemble. The number of cross bars can be selected according to actual needs to ensure the stability of the structure and to ensure that the force distribution of the first end plate 306 and the second end plate 307 is balanced.

[0058] like Figure 5 As shown, according to a further embodiment of the present invention, the first heating plate 301 and the second heating plate 302 both include a heating plate resistance wire I and a heating plate outer frame II, and the heating plate resistance wire I is arranged in the heating plate outer frame II. Specifically, the heating plate resistance wire I of the first heating plate 301 can heat up the first heating plate 301 through the thermal effect of the current, and the first heating plate 301 transfers the heat to the first steel plate 101, and the heating plate resistance wire I of the second heating plate 303 can heat up the second heating plate 303 through the thermal effect of the current, and the second heating plate 303 transfers the heat to the second steel plate 102, thereby heating up the interface of the steel-concrete test piece 1. The heating plate outer frame II is rigidly designed and can bear and transfer normal loads.

[0059] like Figure 1 and Figure 4As shown, according to one embodiment of the present invention, the tangential loading assembly 4 includes a tangential actuator 401, a first clamping plate 402, a second clamping plate 403 and a second connecting member 404; the loading end of the tangential actuator 401 is fixed to the first clamping plate 402, the first clamping plate 402 and the second clamping plate 403 are respectively located on opposite sides of the concrete 101, and are used to clamp the concrete 101, and the first clamping plate 402 and the second clamping plate 403 are fixed by the second connecting member 404; thereby, the tangential actuator 401 can apply corresponding tangential loads according to test requirements, for example For example, unidirectional load, repeated load, long-term load and impact load can be applied, wherein the unidirectional load can be pressure applied to the concrete 101 from top to bottom, or can be tension applied to the concrete 101 from bottom to top; the repeated load can be applying pressure to the concrete 101 first, then pulling the concrete 101 back, and then applying pressure to the concrete 101, and repeating this process; the long-term load can be a tangential load applied to the concrete 101 continuously for a long time; and the impact load can be a tangential load applied to the concrete 101 in a very short time.

[0060] According to a further embodiment of the present invention, the second connecting member 404 is a screw rod, and the two ends of the screw rod respectively pass through the first clamping plate 402 and the second clamping plate 403 and are respectively fixed by the second nut 405; thus, the structure is simple and easy to disassemble and assemble. The number of screw rods can be selected according to actual needs to ensure the stability of the structure and to balance the forces on the first clamping plate 402 and the second clamping plate 403.

[0061] It should be noted that the first panel 202, the second panel 203, the first reinforcing rib 204, the second reinforcing rib 205 involved in the bottom plate support assembly 2 of the present invention, the first end plate 306, the second end plate 307, the first connecting piece 308, the first nut 309, the fastening piece 304, the screw 305 involved in the normal loading assembly 3, and the first clamping plate 402, the second clamping plate 403, the second connecting piece 404, the second nut 405, etc. involved in the tangential loading assembly 4 are all made of ordinary steel, high-strength steel, fire-resistant and weather-resistant steel or stainless steel.

[0062] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0063] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A device for testing the mechanical properties of steel-concrete interfaces under long-term loads, repeated actions, fire, and impact conditions throughout the life cycle of a structure, characterized in that: The invention comprises a supporting base, a normal loading device and a tangential loading device, wherein the supporting base fixes the test piece through two panels with holes and a single-side groove; the normal loading device applies a normal load to the test piece through a normal actuator, and can change the temperature of the test piece interface through two heating plates respectively connected to the abutting piece and the loading end of the normal actuator; the tangential loading device fixes the test piece through bolts and two clamping plates, and applies a tangential load to the test piece through the tangential actuator; By applying a tangential load to the test piece through the tangential actuator, a unidirectional load, a repeated load, a long-term load and an impact load in the whole life cycle of the structure can be applied; The support base further comprises a bottom plate and reinforcing ribs, wherein a first panel and a second panel of the two panels of the support base are vertically connected to the base, a single-side groove of the first panel faces the second panel, and a single-side groove of the second panel faces the first panel; The normal loading device also includes a first end plate, a second end plate and a cross bar. The first end plate and the second end plate are arranged opposite to each other. The fixed end of the normal actuator is connected to the first end plate, and the loading end is connected to one of the two heating plates. One end of the fastening member is connected to the second end plate, and the other end is connected to the second of the two heating plates. The cross bar is arranged between the first end plate and the second end plate, and both ends are connected to the first end plate and the second end plate respectively.

2. The device for testing the mechanical properties of the steel-concrete interface under long-term load, repeated action, fire and impact conditions during the entire life cycle of the structure according to claim 1 is characterized in that: By changing the temperature of the test piece interface through the heating plate, the fire effect in the whole life cycle of the structure can be simulated.

3. The device for testing the mechanical properties of the steel-concrete interface under the conditions of long-term load, repeated action, fire and impact during the whole life cycle of the structure according to claim 1 is characterized in that: The first panel and the second panel are provided with a hole and a single-sided groove, and the size of the hole and the single-sided groove matches the test piece.

4. The device for testing the mechanical properties of the steel-concrete interface under the conditions of long-term load, repeated action, fire and impact during the whole life cycle of the structure according to claim 3 is characterized in that: A reinforcing rib is vertically connected to a side of the first panel facing away from the groove, and a reinforcing rib is vertically connected to a side of the second panel facing away from the groove.

5. The device for testing the mechanical properties of the steel-concrete interface under the conditions of long-term load, repeated action, fire and impact during the whole life cycle of the structure according to claim 1 is characterized in that: The normal loading device also includes a screw, and the screw connects the heating plate and the test piece steel plate through a screw hole.

6. The device for testing the mechanical properties of the steel-concrete interface under the conditions of long-term load, repeated action, fire and impact during the whole life cycle of the structure according to claim 1 is characterized in that: The tangential actuator is connected to one of the two clamping plates.

7. The device for testing the mechanical properties of the steel-concrete interface under long-term load, repeated action, fire and impact conditions during the entire life cycle of the structure according to any one of claims 1 to 6, characterized in that: The panel, bottom plate, reinforcing ribs, first end plate, second end plate, crossbar, bolts, screws, fastening members and clamping plates are all made of ordinary steel, high-strength steel, fire-resistant and weather-resistant steel or stainless steel.

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