A fatigue test device for a boot-shaped steel column base of a railway sound barrier and its fatigue test method

Abstract

The present invention relates to the technical field of construction equipment. A fatigue test device for a boot-shaped steel column foot of a railway sound barrier according to the present invention, the fatigue test device includes: a reaction wall, a concrete pedestal, an actuator, a tool beam, a threaded steel bar, and a boot-shaped steel column foot; the tool beam is arranged between the reaction wall and the concrete pedestal for limiting, a plurality of screw rods are symmetrically embedded in the upper surface of the concrete pedestal, and a plurality of strain gauges are evenly arranged on the part of the screw rod embedded in the concrete pedestal, on the concrete pedestal, and on the surface of the boot-shaped steel column foot; loading plates are arranged on both the left and right sides of the boot-shaped steel column foot, and the loading plate on the side close to the reaction wall is fixedly connected to the output end of the actuator through bolts and nuts. The fatigue test method of the present invention simulates the pulsating wind pressure of a train through the provided actuator, and the fatigue performance of the steel column foot component of the sound barrier under the pulsating pressure generated when the train passes and other various loads, and the operation is simple.

Description

Technical Field

[0001] The present invention relates to the technical field of construction equipment, and particularly to a fatigue test device for a boot-shaped steel column foot of a railway sound barrier and a fatigue test method thereof. Background Art

[0002] Sound barriers are mainly used for sound insulation and noise reduction of highways, expressways, elevated composite roads and other noise sources. They are divided into reflective sound barriers for pure sound insulation and composite sound barriers that combine sound absorption and sound insulation, and the latter is a more effective sound insulation method.

[0003] When a train passes through a sound barrier, the pulsating wind pressure of the train will exert tensile and compressive forces on the sound barrier. During the designed service life, it needs to withstand millions of times of the pulsating wind pressure of the train. The sound barrier not only needs to meet the acoustic performance, but also the mechanical and physical properties. The anti-fatigue performance of the railway sound barrier is an important index of its mechanical properties, and it is necessary to conduct fatigue tests on the sound barrier products under the most unfavorable design load conditions to investigate their anti-fatigue performance.

[0004] When the train speed is relatively high and the sound barrier is a fully enclosed structure, the effect of the pulsating pressure of the train on the sound barrier is very obvious. Therefore, it is necessary to provide a fatigue test method suitable for the fatigue test of the railway sound barrier in view of the pulsating wind pressure of the train and the characteristics of the railway sound barrier, which is used to simulate the working condition of the tensile and compressive cyclic action of the pulsating wind pressure of the train on the main steel structure of the sound barrier, meet the test force value accuracy, obtain test quantitative data, and meet the test requirements of different specifications of sound barrier specimens. In view of this, we propose a fatigue test device for a boot-shaped steel column foot of a railway sound barrier and a fatigue test method thereof. Summary of the Invention

[0005] The purpose of the present invention is to provide a fatigue test device for a boot-shaped steel column foot of a railway sound barrier and a fatigue test method thereof, so as to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A fatigue test device for a boot-shaped steel column foot of a railway sound barrier, the fatigue test device includes: a reaction wall, a concrete pedestal, an actuator, a tool beam, a threaded steel bar and a boot-shaped steel column foot;

[0008] The reaction wall is oppositely arranged to the concrete pedestal, and the concrete pedestal is fixed on the ground trough through anchor bolts;

[0009] The tool beam is arranged between the reaction wall and the concrete pedestal for limiting, and both ends of the threaded steel bar are connected and fixed to the reaction wall and the concrete pedestal;

[0010] On the upper surface of the concrete pedestal, multiple screw rods are symmetrically embedded, and multiple strain gauges are evenly distributed on the part of the screw rod embedded in the concrete pedestal, on the concrete pedestal, and on the surface of the boot-shaped steel column base;

[0011] The boot-shaped steel column base is installed and fixed on the concrete pedestal through the screw rods. The actuator is horizontally installed on the reaction wall. Loading plates are arranged on both the left and right sides of the boot-shaped steel column base, and the loading plate close to the reaction wall side is connected and fixed to the output end of the actuator through bolts and nuts.

[0012] Preferably, a displacement meter is further included. The displacement meters are installed at the four corners of the boot-shaped steel column base and on the screw rods. The displacement meters are used to collect the displacement of the boot-shaped steel column base under stress and the loosening condition of the screw rods.

[0013] Preferably, two threaded steel bars are provided and symmetrically arranged on both sides of the concrete pedestal;

[0014] Wherein, one end of the threaded steel bar passing through the reaction wall is locked by a set limit nut;

[0015] A baffle is arranged at one end of the threaded steel bar close to the concrete pedestal, and the baffle locks the concrete pedestal to the side close to the reaction wall through a set limit nut.

[0016] Preferably, the loading plate is welded and fixed to the boot-shaped steel column base through a set cross-shaped steel plate, and the loading plates on both sides of the boot-shaped steel column base are symmetrically arranged

[0017] Preferably, multiple transverse stiffening ribs and vertical stiffening ribs for toughening are arranged on the surface of the boot-shaped steel column base.

[0018] Preferably, the actuator is connected to an external servo hydraulic source, the oil outlet of the servo hydraulic source is communicated with the oil inlet of the actuator, and the oil inlet of the servo hydraulic source is communicated with the oil outlet of the actuator;

[0019] The strain gauges are connected to an external stress acquisition instrument for collecting the strain condition of the boot-shaped steel column base under stress.

[0020] The present invention also provides a fatigue test method for performing fatigue tests on railway sound barriers using the fatigue test device, including the following steps:

[0021] Step 1: Device installation

[0022] 11. Pass one end of the threaded steel bar through the reaction wall and the other end through the steel plate. The width of the steel plate is greater than the distance between the two threaded steel bars, and both ends are fixed by nuts;

[0023] 12. Place the tool beam between the concrete pedestal and the reaction wall to ensure the fixation of the relative positions between the concrete pedestal and the reaction wall.

[0024] Step 2: Equipment debugging

[0025] 21. Install the actuator and the boot-shaped steel column base on the reaction wall and the concrete pedestal respectively. The actuator is placed horizontally, and the boot-shaped steel column base is placed vertically.

[0026] 22. Use bolts to connect and fix the output end of the actuator to the loading end plate on one side of the boot-shaped steel column base. At the same time, connect the actuator to the external servo hydraulic source, and connect the strain gauge to the external stress acquisition instrument.

[0027] Step 3: Fatigue test, including two loading forms: fatigue loading and static loading.

[0028] Among them, there are two working conditions set for fatigue loading:

[0029] Working condition A: Before the fatigue crack appears in the boot-shaped steel column base, the actuator pauses once every 200,000 loadings.

[0030] Working condition B: After the fatigue crack appears in the boot-shaped steel column base, the actuator pauses once every 100,000 loadings.

[0031] Static loading is: Gradually increase the loading pressure of the actuator until the fatigue load value of the boot-shaped steel column base is reached.

[0032] The fatigue test process includes the following steps:

[0033] Step 31: Conduct static loading on the boot-shaped steel column base.

[0034] Step 32: Conduct fatigue loading under the condition of working condition A, and conduct static loading once every 200,000 loadings of the actuator.

[0035] Step 33: Conduct fatigue loading under the condition of working condition B, and conduct static loading once every 100,000 loadings of the actuator.

[0036] During the process of steps 31, 32 and 33 when conducting fatigue loading and static loading, collect the strain data of the screw, the concrete pedestal and the boot-shaped steel column base through the strain gauge, and collect the displacement readings of the boot-shaped steel column base and the screw through the displacement gauge; at the same time, observe and record the weld cracking situation of the boot-shaped steel column base or record the crack propagation length and shape, and monitor the working state of the screw and the working state of the concrete pedestal.

[0037] Step 4: According to the strain data recorded by the strain gauge, the stress conditions of the screw, the concrete pedestal and the boot-shaped steel column base during the test process can be monitored in real time.

[0038] According to the recorded data of the displacement gauges at the four corners of the boot-shaped steel column base, it can be judged whether the consolidation between the boot-shaped steel column base and the concrete pedestal is satisfied;

[0039] According to the recorded data of the displacement gauges on the screw rod, it can be judged whether the screw rod is loose.

[0040] Compared with the prior art, the beneficial effects of the present invention are as follows: The fatigue test device for the boot-shaped steel column base of the railway sound barrier and its fatigue test method simulate the working condition of the tensile and compressive cyclic action on the sound barrier test piece by the pulsating wind pressure of the train through the actuator arranged, evaluate the fatigue performance of the steel column base components of the fully enclosed sound barrier under the pulsating pressure generated when the train passes and other various load actions, explore the stress mechanism of the screw rod and the steel column base components under the fatigue load when bending internally or externally, verify the safety of the steel column base components, and have a simple structure and are convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is the overall structural schematic diagram of the present invention;

[0042] Figure 2 is the side view of the overall structure of the present invention;

[0043] Figure 3 is the installation structural schematic diagram of the reaction wall and the concrete pedestal of the present invention;

[0044] Figure 4 is the partial cross-sectional view of the concrete pedestal in the present invention;

[0045] Figure 5 is the structural schematic diagram of the boot-shaped steel column base in the present invention.

[0046] In the figure: 1. Reaction wall; 2. Concrete pedestal; 21. Strain gauge; 3. Actuator; 4. Tool beam; 5. Rebar; 51. Baffle; 52. Limit nut; 6. Boot-shaped steel column base; 61. Loading plate; 611. Cross-shaped steel plate; 62. Transverse stiffening rib; 63. Vertical stiffening rib; 7. Screw rod; 8. Anchor bolt; 9. Displacement gauge. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0047] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0048] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0049] In the description of this patent, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "attachment", "setting" should be understood in a broad sense. For example, it can be fixedly connected and set, or detachably connected and set, or integrally connected and set. For those of ordinary skill in the art, the specific meanings of the above terms in this patent can be understood according to specific circumstances. In addition, in the description of the present invention, the meanings of "multiple roots" and "multiple" are that the number is two or more, unless otherwise clearly and specifically defined.

[0050] Embodiment 1

[0051] A fatigue test device for a boot-shaped steel column foot of a railway sound barrier, as Figures 1-5 shown. The fatigue test device includes: a reaction wall 1, a concrete pedestal 2, an actuator 3, a tool beam 4, a deformed bar 5, and a boot-shaped steel column foot 6; the reaction wall 1 and the concrete pedestal 2 are oppositely arranged, and the concrete pedestal 2 is fixed to the ground trough by anchor bolts 8; the tool beam 4 is arranged between the reaction wall 1 and the concrete pedestal 2 for limiting, and both ends of the deformed bar 5 are connected and fixed to the reaction wall 1 and the concrete pedestal 2; multiple screw rods 7 are symmetrically embedded in the upper surface of the concrete pedestal 2, and a plurality of strain gauges 21 are evenly arranged on the part of the screw rod 7 embedded in the concrete pedestal 2, on the concrete pedestal 2, and on the surface of the boot-shaped steel column foot 6; the boot-shaped steel column foot 6 is installed and fixed on the concrete pedestal 2 through the screw rod 7, the actuator 3 is horizontally installed on the reaction wall 1, loading plates 61 are arranged on both the left and right sides of the boot-shaped steel column foot 6, and the loading plate 61 on the side close to the reaction wall 1 is connected and fixed to the output end of the actuator 3 through bolts and nuts. The whole fatigue test device has a simple structure, is convenient for on-site assembly, and has a low test cost and is easy to use.

[0052] It should be noted that a displacement gauge 9 is also included. Displacement gauges 9 are installed at the four corners of the boot-shaped steel column base 6 and on the screw rod 7. The displacement gauge 9 is used to collect the displacement of the boot-shaped steel column base 6 under stress and the loosening condition of the screw rod 7. Among them, the contact points of the displacement gauges 9 at the four corners of the boot-shaped steel column base 6 are vertically in contact with the boot-shaped steel column base 6, which is used to accurately detect the linear displacement change in the horizontal direction during the test. The contact points of the displacement gauges 9 on the screw rod 7 are horizontally in contact with the outer surface of the screw rod 7, which is used to accurately detect the displacement change of the circumferential loosening of the screw rod 7 during the test.

[0053] Specifically, two threaded steel bars 5 are provided and symmetrically arranged on both sides of the concrete pedestal 2. One end of the threaded steel bar 5 passing through the reaction wall 1 is locked by a set limit nut 52. A baffle 51 is provided at one end of the threaded steel bar 5 close to the concrete pedestal 2, and the baffle 51 locks the concrete pedestal 2 to the side close to the reaction wall 1 through the set limit nut 52, which is convenient for clamping and pressing the reaction wall 1 and the concrete pedestal 2 relative to each other at both ends of the tool beam 4 by using the threaded steel bar 5.

[0054] In addition, the loading plate 61 is welded and fixed to the boot-shaped steel column base 6 through a set cross steel plate 611, and the loading plates 61 on both sides of the boot-shaped steel column base 6 are symmetrically arranged. If only one loading steel plate is provided on the inner side of the boot-shaped steel column base 6, when the inner side of the boot-shaped steel column base 6 is in tension, the actuator 3 will apply pressure to the loading plate 61. If the outer side of the boot-shaped steel column base 6 is in tension, at this time the actuator 3 will apply a tensile force to the loading plate 61. It can be known from the steel structure specification that when the screw rod 7 undergoes fatigue failure, the main factor is its tensile stress amplitude, and at this time the stress amplitude borne by the screw rod 7 may be higher than the design stress amplitude, resulting in the screw rod 7 failing before the component. To meet the symmetry and the differences in the forces on the inner and outer sides of the boot-shaped steel column base 6, a tensile force will be applied to the loading plate 61 to ensure that the screw rod 7 only bears pressure and the component does not fail, ensuring the smooth progress of the experiment. Therefore, loading plates 61 are provided on both sides of the boot-shaped steel column base 6 to ensure that the screw rod 7 only bears pressure and not tensile force, ensuring the smooth progress of the experiment.

[0055] Furthermore, multiple transverse stiffeners 62 and vertical stiffeners 63 for toughening are provided on the surface of the boot-shaped steel column base 6 to increase the compressive strength of the trunk of the boot-shaped steel column base 6.

[0056] In addition, the actuator 3 is connected to an external servo hydraulic source, and the oil outlet of the servo hydraulic source is communicated with the oil inlet of the actuator 3, and the oil inlet of the servo hydraulic source is communicated with the oil outlet of the actuator 3. The servo hydraulic source provides oil for driving the actuator 3, and through the setting of the circuit, the oil can be recycled, which is convenient for the long-term fatigue test of the boot-shaped steel column base 6. In addition, the servo hydraulic source of the present invention is an existing device, which can be fully realized by those skilled in the art and does not need to be elaborated. The content protected by the present invention does not involve the improvement of the servo hydraulic source.

[0057] It should be noted that the strain gauge 21 is connected to an external stress collector, which is used to convert the pressure signal sensed by the strain gauge 21 into a digital signal for intuitive display. In addition, the stress collector of the present invention is an existing device and can be fully realized by those skilled in the art without further elaboration. The content protected by the present invention does not involve the improvement of the stress collector either.

[0058] Embodiment 2

[0059] A fatigue test method, using the fatigue test device for fatigue testing of railway sound barriers, includes the following steps:

[0060] Step 1: Device installation

[0061] 11. Pass one end of the deformed steel bar 5 through the reaction wall 1 and the other end through the steel plate 51, and the width of the steel plate 51 is greater than the spacing between the two deformed steel bars 5. Fix both ends with nuts 52.

[0062] 12. Place the tool beam 4 between the concrete pedestal 2 and the reaction wall 1 to ensure the relative position between the concrete pedestal 2 and the reaction wall 1 is fixed.

[0063] Step 2: Equipment debugging

[0064] 21. Install the actuator 3 and the boot-shaped steel column base 6 on the reaction wall 1 and the concrete pedestal 2 respectively, and the actuator 3 is placed horizontally while the boot-shaped steel column base 6 is placed vertically.

[0065] 22. Use bolts to connect and fix the output end of the actuator 3 to the loading end plate 61 on one side of the boot-shaped steel column base 6. At the same time, connect the actuator 3 to an external servo hydraulic source and connect the strain gauge 21 to an external stress collector.

[0066] Step 3: Fatigue test, including two loading forms: fatigue loading and static loading;

[0067] Among them, there are two working conditions for fatigue loading:

[0068] Working condition A: Before the fatigue crack appears in the boot-shaped steel column base 6, the actuator 3 pauses once every 200,000 loadings.

[0069] Working condition B: After the fatigue crack appears in the boot-shaped steel column base 6, the actuator 3 pauses once every 100,000 loadings.

[0070] Static loading is: gradually increase the loading pressure of the actuator 3 until the fatigue load value of the boot-shaped steel column base 6 is reached.

[0071] The fatigue test process includes the following steps:

[0072] Step 31: Apply static load to the boot-shaped steel column base 6;

[0073] Step 32: Conduct fatigue loading under Condition A, and perform static loading once every 200,000 cycles of loading by the actuator 3;

[0074] Step 33: Conduct fatigue loading under Condition B, and perform static loading once every 100,000 cycles of loading by the actuator 3;

[0075] During the process of fatigue loading and static loading in Step 31, Step 32, and Step 33, strain data of the screw 7, concrete pedestal 2, and boot-shaped steel column base 6 collected by the strain gauges 21, and displacement readings of the boot-shaped steel column base 6 and the screw 7 collected by the displacement gauges 9 are obtained; meanwhile, observe and record the weld cracking condition of the boot-shaped steel column base 6 or record the crack propagation length and morphology, and monitor the working state of the screw 7 and the working state of the concrete pedestal 2;

[0076] Step 4: The stress conditions of the screw 7, concrete pedestal 2, and boot-shaped steel column base 6 during the test can be monitored in real time according to the strain data recorded by the strain gauges 21;

[0077] According to the data recorded by the displacement gauges 9 at the four corners of the boot-shaped steel column base 6, it can be judged whether the consolidation between the boot-shaped steel column base 6 and the concrete pedestal 2 is satisfied;

[0078] According to the data recorded by the displacement gauges 9 on the screw 7, it can be judged whether the screw 7 is loose.

[0079] It should be noted that during the fatigue loading process, the strain gauges 21 are connected to an external dynamic data collector, and during the static loading process, the strain gauges 21 are connected to an external static data collector, which can be fully realized by those skilled in the art and will not be elaborated here.

[0080] It can be seen from the above that when the actuator 3 is driven by the servo hydraulic source, its output end repeatedly presses the boot-shaped steel column base 6. Before the fatigue crack appears at the weld of the boot-shaped steel column base 6, the actuator 3 loads 200,000 times each time, and observe and record the weld cracking condition of the boot-shaped steel column base 6, the working state of the screw 7, the deformation of the gusset plate, and the working state of the concrete pedestal 2, etc.; after the fatigue crack appears at the weld of the boot-shaped steel column base 6, load 100,000 times each time, observe and record the crack propagation length and morphology, check the working state of the screw 7, the deformation of the gusset plate, and the working state of the concrete pedestal 2, etc., and collect the stress change data through the strain gauges 21, and collect the displacement readings through the displacement gauges 9 to collect the changes of various indexes in the fatigue test in real time, so as to achieve the purpose of fatigue test on the boot-shaped steel column base 6 of the railway sound barrier;

[0081] By setting the actuator 3 to simulate the working condition of the tensile and compressive cyclic action on the sound barrier specimen by the pulsating wind pressure of the train, the fatigue performance of the boot-shaped steel column base 6 of the fully enclosed sound barrier under the pulsating pressure generated when the train passes and other various loadings is evaluated, the stress mechanism of the screw 7 and the boot-shaped steel column base 6 under the action of fatigue load when bending occurs inside or outside is explored, and the safety of the boot-shaped steel column base 6 is verified. The structure is simple, the operation is convenient, and it is easy to popularize and promote.

[0082] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only the preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A fatigue test device for a boot-shaped steel column foot of a railway sound barrier, characterized in that: The fatigue test device includes: a reaction wall (1), a concrete pedestal (2), an actuator (3), a tool beam (4), a deformed steel bar (5) and a boot-shaped steel column foot (6); The reaction wall (1) is arranged opposite to the concrete pedestal (2), and the concrete pedestal (2) is fixed on the ground trough by anchor bolts (8); The tool beam (4) is arranged between the reaction wall (1) and the concrete pedestal (2) for limiting, and both ends of the deformed steel bar (5) are connected and fixed to the reaction wall (1) and the concrete pedestal (2); A plurality of screw rods (7) are symmetrically embedded on the upper surface of the concrete pedestal (2), and a plurality of strain gauges (21) are evenly arranged on the part of the screw rod (7) embedded in the concrete pedestal (2), on the concrete pedestal (2), and on the surface of the boot-shaped steel column foot (6); The boot-shaped steel column foot (6) is installed and fixed on the concrete pedestal (2) through the screw rod (7), the actuator (3) is horizontally installed on the reaction wall (1), loading plates (61) are arranged on both the left and right sides of the boot-shaped steel column foot (6), and the loading plate (61) on the side close to the reaction wall (1) is connected and fixed to the output end of the actuator (3) by bolts and nuts; It further includes displacement gauges (9), and displacement gauges (9) are installed at the four corners of the boot-shaped steel column foot (6) and on the screw rod (7). The displacement gauges (9) are used to collect the displacement of the boot-shaped steel column foot (6) under stress and the loosening condition of the screw rod (7); The loading plate (61) is welded and fixed to the boot-shaped steel column foot (6) through a cross steel plate (611) provided, and the loading plates (61) on both sides of the boot-shaped steel column foot (6) are symmetrically arranged.

2. The fatigue test device for a boot-shaped steel column foot of a railway sound barrier according to claim 1, characterized in that: Two deformed steel bars (5) are provided, symmetrically arranged on both sides of the concrete pedestal (2); Among them, one end of the deformed steel bar (5) passing through the reaction wall (1) is locked by a limit nut (52) provided; A baffle (51) is arranged at one end of the deformed steel bar (5) close to the concrete pedestal (2), and the concrete pedestal (2) is locked to the side close to the reaction wall (1) by a limit nut (52) provided.

3. The fatigue test device for a boot-shaped steel column foot of a railway sound barrier according to claim 1, characterized in that: A plurality of transverse stiffening ribs (62) and vertical stiffening ribs (63) for toughening are arranged on the surface of the boot-shaped steel column foot (6).

4. The fatigue test device for a boot-shaped steel column foot of a railway sound barrier according to claim 1, characterized in that: The actuator (3) is connected to an external servo hydraulic source, and the oil outlet of the servo hydraulic source is communicated with the oil inlet of the actuator (3), and the oil inlet of the servo hydraulic source is communicated with the oil outlet of the actuator (3); The strain gauge (21) is connected to an external stress collector, and is used to collect the strain condition of the boot-shaped steel column base (6) under stress.

5. A fatigue test method, which uses the fatigue test device according to any one of claims 1 to 4 to perform a fatigue test on a railway noise barrier. It is characterized in that it includes the following steps: Step 1: Device installation 11. Pass one end of the deformed steel bar (5) through the reaction wall (1), and the other end through the steel plate (51). The width of the steel plate (51) is greater than the spacing between the two deformed steel bars (5), and both ends are fixed by nuts (52).

12. Place the tool beam (4) between the concrete pedestal (2) and the reaction wall (1) to ensure the fixed relative position between the concrete pedestal (2) and the reaction wall (1). Step 2: Equipment debugging 21. Install the actuator (3) and the boot-shaped steel column base (6) on the reaction wall (1) and the concrete pedestal (2) respectively. The actuator (3) is placed horizontally, and the boot-shaped steel column base (6) is placed vertically.

22. Use bolts to connect and fix the output end of the actuator (3) to the loading end plate (61) on one side of the boot-shaped steel column base (6). At the same time, connect the actuator (3) to an external servo hydraulic source, and connect the strain gauge (21) to an external stress collector. Step 3: Fatigue test, including two loading forms: fatigue loading and static loading; Among them, there are two working conditions for fatigue loading: Working condition A: Before the fatigue crack of the boot-shaped steel column base (6) appears, the actuator (3) pauses once every 200,000 loadings. Working condition B: After the fatigue crack of the boot-shaped steel column base (6) appears, the actuator (3) pauses once every 100,000 loadings. The static loading is: gradually increase the loading pressure of the actuator (3) until the fatigue load value of the boot-shaped steel column base (6) is loaded. The fatigue test process includes the following steps: Step 31: Perform static loading on the boot-shaped steel column base (6). Step 32: Perform fatigue loading under the condition of working condition A, and perform static loading once every 200,000 loadings of the actuator (3). Step 33: Perform fatigue loading under the condition of working condition B, and perform static loading once every 100,000 loadings of the actuator (3). During the processes of fatigue loading and static loading in Step 31, Step 32 and Step 33, the strain data of the screw rod (7), the concrete pedestal (2) and the boot-shaped steel column base (6) collected by the strain gauge (21) are used, and the displacement readings of the boot-shaped steel column base (6) and the screw rod (7) are collected by the displacement gauge (9); at the same time, observe and record the weld cracking condition of the boot-shaped steel column base (6) or record the expansion length and shape of the crack, and monitor the working state of the screw rod (7) and the working state of the concrete pedestal (2). Step 4: According to the strain data recorded by the strain gauge (21), the stress conditions of the screw rod (7), the concrete pedestal (2) and the boot-shaped steel column base (6) during the test process can be monitored in real time; According to the data recorded by the displacement gauges (9) at the four corners of the boot-shaped steel column base (6), it can be judged whether the consolidation between the boot-shaped steel column base (6) and the concrete pedestal (2) is satisfied; According to the data recorded by the displacement gauge (9) on the screw rod (7), it can be judged whether the screw rod (7) is loose.

Images