Laboratory simulation method for interaction between human and flexible structure

Abstract

The embodiment of the invention discloses a laboratory simulation method for interaction between a person and a flexible structure. A foundation, an external steel frame, a first-type sliding device, a second-type sliding device, an axial rigidity adjusting device, a torsional rigidity adjusting device, a hanging rod, a steel plate, a running machine and an acceleration sensor are included. Four column feet of the external steel frame are fixed on a foundation in a bolt connection mode; the linear sliding device is mounted at the corresponding positions of the external steel frame and the steel plate; the second-type sliding device is fixed on the external steel frame and the foundation; the torsional rigidity adjusting device is connected with the front end of the steel plate; the treadmill is placed on a steel plate, acceleration sensors are installed on the two sides of the steel plate, and a tester carries the acceleration sensors. According to the embodiment of the invention, the components can be assembled indoors, and the interaction of a human and a structure can be simulated in a laboratory, so that the operation is more convenient; in the conventional method for measuring the interaction between the human and the structure, a pedestrian walks on an actual structure, so that the manpower and material resources are relatively high in cost.

Description

Technical Field

[0001] The present application relates to the field of structural test research, and in particular to a laboratory simulation method for the interaction between humans and flexible structures. Background Art

[0002] As bridge structures evolve, their aesthetic appeal increases, while their stiffness and damping decrease. This makes bridges more sensitive to external loads, particularly pedestrian loads. When people walk on flexible bridges, they exert loads on the structure, which in turn exerts loads on the pedestrians. People automatically adjust their speed and acceleration to accommodate the flexible structure. For bridge structures, pedestrian loads primarily impact vertical, lateral, and torsional forces, while the longitudinal effects of pedestrian loads have minimal impact.

[0003] Human-induced vibration event: On the opening day of the London Millennium Bridge, about 2,000 people walked on the bridge at the same time. As a large number of pedestrians passed through the Millennium Bridge, vertical vibrations were generated and significant lateral vibrations also occurred.

[0004] The interaction between people and bridges is mainly reflected in two aspects: first, the impact of pedestrians on bridges: Since the human body itself has a certain damping, when pedestrians are on the bridge, the human body is equivalent to a small damper, which can affect the damping of the structure to a certain extent and thus affect the dynamic characteristics of the bridge; second, the impact of the bridge on people: pedestrian loads are more random, and people have less inertia. People will adjust their own shape according to the external environment to maintain body stability and comfort. Flexible bridges will produce horizontal and vertical vibrations under the action of loads, and pedestrians will spontaneously adjust their body swing and step frequency according to the vibration frequency of the bridge to adapt to the bridge.

[0005] Previous research: Harper used force plates to measure the vertical and horizontal forces generated by a single person's normal stride. Previous studies have primarily measured pedestrian loads by having pedestrians pass over structures in various ways, or by measuring pedestrian loads on rigid surfaces. These methods are labor-intensive and inconvenient, or fail to account for the interaction between pedestrians and bridges, or the stiffness of the structure, resulting in data that deviates from the actual response of pedestrians and structures. Summary of the Invention

[0006] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a laboratory simulation method for human-flexible structure interaction, which is used to test the interaction between human and flexible structure.

[0007] The present application provides a laboratory simulation method for interaction between a person and a flexible structure, wherein the structure can be assembled in a laboratory during use, and is characterized in that it comprises: a foundation, an external steel frame, a first-type sliding device, a second-type sliding device, an axial stiffness adjustment device, a torsional stiffness adjustment device, a suspension rod, a steel plate, a treadmill, and an acceleration sensor;

[0008] The four column feet of the external steel frame are fixed to the foundation by bolt connection, and no relative displacement occurs between the column feet and the foundation; the type 1 sliding device is installed at the corresponding positions of the external steel frame and the steel plate, and no relative displacement occurs between the external steel frame and the steel plate; the type 2 sliding device is fixed to the external steel frame and the foundation, and no relative displacement occurs between the external steel frame and the foundation; one end of the vertically installed axial stiffness adjustment device is hingedly connected to the type 1 sliding device fixed on the external steel frame, and the other end is hingedly connected to the suspension rod, and the other end of the suspension rod is hingedly connected to the type 1 sliding device installed on the steel plate; one end of the horizontally installed axial stiffness adjustment device is hingedly connected to the type 1 sliding device fixed on the external steel frame, and the other end is hingedly connected to the side of the steel plate; the torsional stiffness adjustment device is connected to the front end of the steel plate, and its main body is connected to the type 2 sliding device; the treadmill is placed on the steel plate, and acceleration sensors are installed on both sides of the steel plate. The tester walks on the treadmill at a certain step frequency and step length, and the tester carries the acceleration sensor on his back.

[0009] In one embodiment of the present application, the external steel frame is formed by I-beams connected by bolts;

[0010] The bases of the four I-beam columns are connected to the foundation with bolts, and the tops of the I-beam columns are connected in pairs through I-beam beams. In addition, the positions where a type of sliding device needs to be installed are also spliced with I-beam beams to provide support for the type of sliding device.

[0011] In one embodiment of the present application, the type I sliding device includes a sliding plate and a sliding groove;

[0012] The inner shape of the sliding groove matches the outer shape of the sliding plate, so that the sliding plate can slide inside the sliding groove;

[0013] According to different installation positions, a type of sliding device installed on the steel plate and the top crossbeam has bolts on the sliding plate to fix the position of the sliding plate;

[0014] In one embodiment of the present application, the second type sliding device includes a first type sliding device and a steel rod;

[0015] The vertical type 1 sliding device is fixed to the two columns of the external steel frame by bolts; the horizontal type 1 sliding device is fixed to the foundation by bolts; the two ends of the horizontal steel rod are connected to the sliding plate of the vertical type 1 sliding device; the bottom end of the vertical steel rod is connected to the sliding plate of the horizontal type 1 sliding device, and the other end is not connected;

[0016] The horizontal steel rod can be moved up and down by a vertical sliding device, and the vertical steel rod can be moved left and right by a horizontal sliding device;

[0017] In one embodiment of the present application, the axial stiffness adjustment device includes an outer cylinder, a spring, a baffle, a pull rod, and an electronic dynamometer;

[0018] One end of the pull rod is connected to six springs, and the other end is hinged. The outer cylinder is a hollow cylinder with a slit on one side of the cylinder wall and six holes on the bottom. The cylinder wall extends outward for a distance, and the top of the cylinder is hinged. The baffle is located at the slit in the cylinder wall. The electronic dynamometer is tied to the outer wall of the outer cylinder.

[0019] The pull rod provides a connection for the axial stiffness adjustment device structure; the spring provides stiffness for the axial stiffness adjustment device; the outer cylinder provides space for the movement of the pull rod and the spring; the baffle controls the effective length of the spring participating in the force; the electronic dynamometer displays the pressure exerted on the baffle;

[0020] The pull rod can move axially along the inner wall of the outer cylinder.

[0021] In one embodiment of the present application, the outer diameter of the pull rod is smaller than the inner diameter of the outer cylinder; the opening radius of the bottom of the outer cylinder and the blocking piece is larger than the outer diameter of the spring.

[0022] In one embodiment of the present application, one end of the horizontal axial stiffness adjustment device is hingedly connected to a sliding plate in a vertical type I sliding device mounted on an external steel frame, and the other end is hingedly connected to the left and right sides of the steel plate;

[0023] The vertical sliding device installed on the external steel frame enables the horizontal axial stiffness adjustment device to move up and down following the steel plate;

[0024] In one embodiment of the present application, one end of the vertical axial stiffness adjustment device is hingedly connected to the sliding plate of the horizontal type 1 sliding device installed on the top crossbeam of the external steel frame, and the other end is hingedly connected to the suspension rod.

[0025] In one embodiment of the present application, one end of the suspension rod is hingedly connected to a sliding plate of a horizontal type sliding device installed on a steel plate, and the other end is hingedly connected to one end of a vertical axial stiffness adjustment device.

[0026] In one embodiment of the present application, the torsional stiffness adjustment device includes a main structure, a rack, a claw, a gyratory steel bar, a rotating arm and a rotating shaft;

[0027] The main structure provides support and installation position for the internal components of the torsional stiffness adjustment device. In addition, holes are opened on the upper and lower and left and right four surfaces of the main structure; the rack is fixed on the front end of the main structure; the claw is installed on the two horizontal bars at the front end of the main structure; the starting part of the rotary steel bar is fixed on the two longitudinal bars of the main structure to provide torsional stiffness for the torsional stiffness adjustment device, and the end part is a triangular steel plate with an opening, and the rotating shaft passes through the opening of the steel plate; the rotating arm consists of a triangular steel plate, a long steel plate and a short steel plate, and the two corner ends of the triangular steel plate are fixed to the triangular steel plate at the end part of the rotary steel bar by bolts, and the other corner end is connected to one end of the long steel plate, one end of the short steel plate is fixed to the end of the rotating shaft, and the other end of the short steel plate is connected to the other end of the long steel plate; the middle section of the long steel plate is hollowed out, and the raised part in the middle of the claw passes through the hollowed-out part of the long steel plate;

[0028] The clamping claw can move horizontally along the two horizontal bars of the main structure and can be clamped on the rack at the same time; the triangular steel plate in the rotating arm can swing around the long steel plate, and the long steel plate in the rotating arm can swing around one end of the short steel plate. The short steel plate in the rotating arm swings with the rotation of the rotating shaft, driving the long steel plate to rotate around the inward protruding part of the clamping claw, and then driving the triangular steel plate in the rotating arm and the triangular steel plate at the end of the spiral steel bar to rotate.

[0029] In one embodiment of the present application, the horizontal steel rod and the vertical steel rod of the second type sliding device pass through the openings on the main structure of the torsional stiffness adjustment device; the second type sliding device provides certain support for the torsional stiffness adjustment device and allows the torsional device to move freely within the plane where the two steel rods are located.

[0030] In one embodiment of the present application, the other end of the rotating shaft of the torsional stiffness adjusting device is fixed to the front side surface of the steel plate; the rotation of the steel plate drives the rotation of the rotating shaft of the torsional stiffness adjusting device.

[0031] Compared with the prior art, this application has the following advantages:

[0032] 1. This application proposes a laboratory simulation method for human-flexible structure interaction. Its components can be assembled indoors, making it more convenient to simulate human-structure interaction in the laboratory. Previous methods for measuring human-structure interaction typically involve pedestrians walking on actual structures, which is labor-intensive and resource-intensive.

[0033] 2. The laboratory simulation method for human-flexible structure interaction in this application takes into account the stiffness of the structure when measuring the interaction between the human and the flexible structure, and the measured data is closer to reality. Previous tests of pedestrian loads typically test people walking on rigid surfaces, without considering the effect of the stiffness of the structure on the pedestrian, which may deviate from the actual reaction of the pedestrian and the structure.

[0034] 3. The laboratory simulation method of human-flexible structure interaction in the present application includes a stiffness adjustment device, which is connected to the structure. The device can be used to adjust the degrees of freedom of the structure in the vertical, horizontal and torsional directions, and to conduct human-structure interaction tests on structures with different parameters, so that the measured data is more comprehensive.

[0035] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The disclosure of this application will be more easily understood with reference to the accompanying drawings. Those skilled in the art will readily appreciate that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this application. Furthermore, similar numbers in the figures represent similar components, where:

[0037] Figure 1 A front view of the overall structure of the laboratory simulation method for interaction between a person and a flexible structure according to the present invention;

[0038] Figure 2 A left view of the overall structure of the laboratory simulation method for interaction between a person and a flexible structure according to the present invention;

[0039] Figure 3 A schematic diagram of a horizontal sliding device for a laboratory simulation method of interaction between a person and a flexible structure according to the present invention;

[0040] Figure 4 A schematic diagram of a vertical type I sliding device for a laboratory simulation method of interaction between a person and a flexible structure according to the present invention;

[0041] Figure 5 Schematic diagram of a type II sliding device for a laboratory simulation method of the interaction between a person and a flexible structure according to the present invention;

[0042] Figure 6 A schematic diagram of the detailed structure of the axial stiffness adjustment device of the laboratory simulation method for the interaction between a person and a flexible structure according to the present invention;

[0043] Figure 7 Schematic diagram of the overall structure of the axial stiffness adjustment device of the laboratory simulation method for the interaction between a person and a flexible structure of the present invention;

[0044] Figure 8 A front view of the structure of the torsional stiffness adjustment device for the laboratory simulation method of the interaction between a person and a flexible structure according to the present invention;

[0045] Figure 9 A left view of the structure of the torsional stiffness adjustment device for the laboratory simulation method of the interaction between a person and a flexible structure according to the present invention;

[0046] Figure 10 This is a schematic diagram of the internal structure of the torsional stiffness adjustment device of the laboratory simulation method for the interaction between humans and flexible structures of the present invention.

[0047] Description of Reference Numerals

[0048] 1. Foundation; 2. External steel frame; 3. Suspension rod; 4. Steel plate; 5. Treadmill; 6. Accelerometer; 7. Sliding plate; 8. Sliding groove; 9. Steel rod; 10. Outer cylinder; 11. Spring; 12. Baffle; 13. Pull rod; 14. Electronic dynamometer; 15. Main structure; 16. Rack; 17. Claw; 18. Rotating steel bar; 19. Rotating arm; 20. Rotating axis. DETAILED DESCRIPTION

[0049] Some embodiments of the present application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present application and are not intended to limit the scope of protection of the present application.

[0050] This embodiment provides a laboratory simulation method for the interaction between humans and flexible structures.

[0051] A laboratory simulation method for the interaction between humans and flexible structures, in which the structures can be assembled in the laboratory, such as Figure 1 and 2As shown, it includes a foundation 1, an external steel frame 2, a type 1 sliding device, a type 2 sliding device, an axial stiffness adjustment device, a torsional stiffness adjustment device, a hanger 3, a steel plate 4, a treadmill 5 and an acceleration sensor 6; the four column feet of the external steel frame 2 are fixed to the foundation 1 by bolt connection, and there is no relative displacement between the column feet and the foundation 1; the type 1 sliding device is installed at the corresponding positions of the external steel frame 2 and the steel plate 4, and there is no relative displacement between the external steel frame 2 and the steel plate 4; the type 2 sliding device is fixed to the external steel frame 2 and the foundation 1, and there is no relative displacement between the external steel frame 2 and the foundation 1; the vertically installed axial stiffness adjustment device One end of the joint device is hingedly connected to a type-one sliding device fixed on the external steel frame 2, and the other end is hingedly connected to the suspension rod 3, and the other end of the suspension rod 3 is hingedly connected to a type-one sliding device installed on the steel plate 4; one end of the transversely installed axial stiffness adjustment device is hingedly connected to a type-one sliding device fixed on the external steel frame 2, and the other end is hingedly connected to the side of the steel plate 4; the torsional stiffness adjustment device is connected to the front end of the steel plate 4, and its main body is connected to the second type sliding device; the treadmill 5 is placed on the steel plate 4, and acceleration sensors 6 are installed on both sides of the steel plate 4. The tester walks on the treadmill 5 with a certain step frequency and step length, and the tester carries the acceleration sensor 6 on his back.

[0052] The steel plate 4 provides a platform for the treadmill 5 and pedestrians; the horizontal axial stiffness adjustment device simulates the lateral stiffness of the structure; the vertical axial stiffness adjustment device simulates the vertical stiffness of the structure; the torsional stiffness adjustment device simulates the torsional stiffness of the structure; the sliding device makes the adjustment device more flexible, so that it can follow the multi-degree-of-freedom movement of the steel plate 4; the external steel frame 2 provides external support for the steel plate 4 and the stiffness adjustment device.

[0053] Furthermore, the external steel frame 2 is formed by I-beams connected by bolts; the bases of the four I-beam columns are connected to the foundation 1 with bolts, and the tops of the I-beam columns are connected in pairs by I-beam crossbeams. In addition, the positions where a type of sliding device needs to be installed are also spliced with I-beam crossbeams to provide support for the type of sliding device; the external steel frame 2 has sufficient strength and rigidity, and it does not displace or deform during the process of simulating the interaction between humans and flexible structures, so as to ensure the accuracy of the simulation experimental data.

[0054] Further, the sliding device of type Figure 3 and 4As shown, it includes a sliding plate 7 and a sliding groove 8; the internal shape of the sliding groove 8 matches the external shape of the sliding plate 7, so that the sliding plate 7 can slide inside the sliding groove 8; according to different installation positions, a type of sliding device installed on the steel plate 4 and the top crossbeam is provided with a bolt on the sliding plate 7 that can fix the position of the sliding plate 7; the position of the connection between the steel plate 4 and the external steel frame 2 can be changed by adjusting the position of the sliding plate 7 of the type of sliding device on the steel plate 4 and the top crossbeam, so as to achieve coarse adjustment of the torsional stiffness of the steel plate 4.

[0055] Further, the second type sliding device is as follows Figure 5 As shown, it includes a type-I sliding device and a steel rod 9; the vertical type-I sliding device is fixed to the two columns of the external steel frame 2 by bolts; the horizontal type-I sliding device is fixed to the foundation 1 by bolts; the two ends of the horizontal steel rod are connected to the sliding plate 7 of the vertical type-I sliding device; the bottom end of the vertical steel rod is connected to the sliding plate 7 of the horizontal type-I sliding device, and the other end is not connected; the horizontal steel rod can be moved up and down by the vertical type-I sliding device, and the vertical steel rod can be moved left and right by the horizontal type-I sliding device.

[0056] Furthermore, the axial stiffness adjustment device is as follows Figure 6 and 7 As shown, it includes an outer cylinder 10, a spring 11, a baffle 12, a pull rod 13 and an electronic dynamometer 14; one end of the pull rod 13 is connected to 6 springs 11, and the other end is hinged; the outer cylinder 10 is a hollow cylinder with a gap on one side of the cylinder wall, 6 holes on the bottom of the cylinder, the cylinder wall extends outward for a distance, and the top of the cylinder is hinged; the baffle 12 is located at the gap in the cylinder wall; the electronic dynamometer 14 is tied to the outer wall of the outer cylinder 10; the pull rod 13 provides a connection for the axial stiffness adjustment device structure; the spring 11 provides stiffness for the axial stiffness adjustment device; the outer cylinder 10 provides space for the movement of the pull rod 13 and the spring 11; the baffle 12 controls the effective length of the spring 11 participating in the force; the vertical stiffness and horizontal stiffness of the steel plate 4 can be adjusted by changing the length of the spring 11 participating in the actual force in the axial stiffness adjustment device; the electronic dynamometer 14 displays the pressure exerted on the baffle.

[0057] Furthermore, the outer diameter of the pull rod 13 is smaller than the inner diameter of the outer cylinder 10, and the pull rod 13 can move axially along the inner wall of the outer cylinder 10; the opening radius of the bottom of the outer cylinder 10 and the baffle 12 is larger than the outer diameter of the spring 11, and the spring 11 can pass through the bottom of the cylinder and the baffle 12, and then the spring 11 can be fixed by the baffle 12, thereby realizing the control of the length of the spring 11 participating in the force.

[0058] Furthermore, one end of the horizontal axial stiffness adjustment device is hingedly connected to the sliding plate 7 in the vertical type-1 sliding device installed on the external steel frame 2, and the other end is hingedly connected to the left and right sides of the steel plate 4; the vertical sliding device installed on the external steel frame 2 enables the horizontal axial stiffness adjustment device to move up and down with the steel plate 4; further, one end of the vertical axial stiffness adjustment device is hingedly connected to the sliding plate 7 of the horizontal type-1 sliding device installed on the top cross beam of the external steel frame 2, and the other end is hingedly connected to the hanger 3.

[0059] Furthermore, one end of the suspension rod 3 is hingedly connected to the sliding plate 7 of the horizontal type 1 sliding device installed on the steel plate 4, and the other end is hingedly connected to one end of the vertical axial stiffness adjustment device.

[0060] Furthermore, the torsional stiffness adjustment device is as follows Figure 8 and 10 As shown, it includes a main structure 15, a rack 16, a claw 17, a rotary steel bar 18, a rotating arm 19 and a rotating shaft 20; the main structure 15 provides support and installation position for the internal components of the torsional stiffness adjustment device, and in addition, holes are opened on the upper and lower and left and right four surfaces of the main structure 15; the rack 16 is fixed to the front end of the main structure 15; the claw 17 is installed on the two horizontal bars at the front end of the main structure 15; the starting part of the rotary steel bar 18 is fixed on the two longitudinal bars of the main structure 15 to provide torsional stiffness for the torsional stiffness adjustment device, and the end part is a triangular steel plate with an opening, and the rotating shaft passes through the opening of the steel plate; the rotating arm 19 consists of a triangular steel plate, a long steel plate and a short steel plate, and the two corner ends of the triangular steel plate are fixed to the triangular steel plate at the end part of the rotary steel bar 18 by bolts, and the other corner end is connected to one end of the long steel plate, and one end of the short steel plate is fixed to the end of the rotating shaft, and the short steel plate is also fixed to the end of the rotating shaft. One end is connected to the other end of the long steel sheet; a middle section of the long steel sheet is hollowed out, and the inward protruding part of the middle of the claw 17 passes through the hollowed-out part of the long steel sheet; the claw 17 can move horizontally along the two horizontal bars of the main structure 15, and can be stuck on the rack 16 at the same time; the triangular steel plate in the rotating arm 19 can swing around the long steel plate, and the long steel plate in the rotating arm 19 can swing around one end of the short steel plate, and the short steel plate in the rotating arm 19 swings with the rotation of the rotating shaft, driving the long steel plate to rotate around the inward protruding part of the claw 17, and then driving the triangular steel plate in the rotating arm 19 and the triangular steel plate at the end of the rotary steel bar 18 to rotate, thereby providing torsional stiffness for the steel plate; in addition, the position of the claw 17 on the horizontal bar can be adjusted to change the radius of the left and right ends of the long steel plate swinging around the claw 17, thereby changing the contraction degree of the rotary steel bar 18, thereby realizing the adjustment of the torsional stiffness of the steel plate 4.

[0061] Furthermore, the horizontal steel rod and the vertical steel rod of the second type sliding device pass through the openings on the main structure 15 of the torsional stiffness adjustment device; the second type sliding device provides certain support for the torsional stiffness adjustment device and allows the torsional device to move freely within the plane where the two steel rods are located.

[0062] Furthermore, the other end of the rotating shaft 20 of the torsional stiffness adjusting device is fixed to the front side surface of the steel plate 4; the rotation of the steel plate 4 drives the rotation of the rotating shaft of the torsional stiffness adjusting device.

[0063] In this embodiment, the external steel frame 2 provides external support for the steel plate 4. When the experimenter walks on the treadmill 5, the steel plate 4 simulates a flexible structure and provides a platform for the person and the treadmill 5. Due to the action of the person, it will produce vertical, horizontal and torsional displacements and accelerations; the horizontally installed axial stiffness adjustment device connects the side of the steel plate 4 with the external steel frame 2, and can follow the vertical movement of the steel plate 4 through a type of sliding device, and provide the steel plate 4 with adjustable horizontal stiffness; the vertically installed axial stiffness adjustment device connects the suspension rod 3 with the external steel frame 2, and the other end of the suspension rod 3 is connected to a type of sliding device on the upper surface of the steel plate 4, providing the steel plate 4 with adjustable vertical stiffness; the torsional stiffness adjustment device The device is connected to the front side of the steel plate 4, providing the steel plate 4 with adjustable torsional stiffness. It is connected to the second type sliding device and can follow the up and down and left and right movements of the steel plate 4; by adjusting the stiffness of the steel plate 4 in different directions and changing the step length and frequency of the pedestrian on the treadmill 5, the interaction between the person and the flexible structure under different conditions can be measured; acceleration sensors 6 are installed on both sides of the steel plate 4, which can record the acceleration of the steel plate 4 during the experimenter's walking; the experimenter also carries a shoulder-mounted acceleration sensor 6 to record his acceleration during walking; in addition, the experimenter has a safety belt tied around his waist connected to the top steel beam of the external steel frame 2 to ensure the safety of the experimenter during the experiment.

[0064] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0065] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0066] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A laboratory simulation method for the interaction between humans and flexible structures, wherein the structure can be assembled in the laboratory, characterized in that: include: Foundation (1), external steel frame (2), type 1 sliding device, type 2 sliding device, axial stiffness adjustment device, torsional stiffness adjustment device, suspension rod (3), steel plate (4), treadmill (5) and acceleration sensor (6); The four column feet of the external steel frame (2) are fixed to the foundation (1) by means of bolt connection, and no relative displacement occurs between the column feet and the foundation (1); the first type sliding device is installed at the corresponding position of the external steel frame (2) and the steel plate (4), and no relative displacement occurs between the external steel frame (2) and the steel plate (4); the second type sliding device is fixed to the external steel frame (2) and the foundation (1), and no relative displacement occurs between the external steel frame (2) and the foundation (1); one end of the vertically installed axial stiffness adjustment device is hingedly connected to the first type sliding device fixed on the external steel frame (2), and the other end is hingedly connected to the hanging device. The rod (3) is hingedly connected, and the other end of the suspension rod (3) is hingedly connected to a type-one sliding device installed on a steel plate (4); one end of the transversely installed axial stiffness adjustment device is hingedly connected to a type-one sliding device fixed on an external steel frame (2), and the other end is hingedly connected to the side of the steel plate (4); the torsional stiffness adjustment device is connected to the front end of the steel plate (4), and its main body is connected to the type-two sliding device; the treadmill (5) is placed on the steel plate (4), and the acceleration sensors (6) are installed on both sides of the steel plate (4). The test person walks on the treadmill (5) at a certain step frequency and step length, and the test person carries the acceleration sensor (6) on his back.

2. A laboratory simulation method for interaction between humans and flexible structures according to claim 1, characterized in that: The external steel frame (2) is formed by splicing I-beams connected by bolts; The bases of the four I-beam columns are connected to the foundation (1) with bolts, and the tops of the I-beam columns are connected in pairs through I-beam crossbeams. In addition, the positions where the first type of sliding device needs to be installed are also spliced with I-beam crossbeams to provide support for the first type of sliding device.

3. A laboratory simulation method for interaction between humans and flexible structures according to claim 1, characterized in that: The first type sliding device comprises a sliding plate (7) and a sliding groove (8); The inner shape of the sliding groove (8) matches the outer shape of the sliding plate (7), so that the sliding plate (7) can slide inside the sliding groove (8); According to different installation positions, the sliding plate (7) of the sliding device installed on the steel plate (4) and the top crossbeam is provided with bolts that can fix the position of the sliding plate (7).

4. A laboratory simulation method for interaction between humans and flexible structures according to claim 1, characterized in that: The second type sliding device comprises the first type sliding device and a steel rod (9); The vertical type-one sliding device is fixed to two upright posts of the external steel frame (2) by bolts; the horizontal type-one sliding device is fixed to the foundation (1) by bolts; both ends of the horizontal steel rod are connected to the sliding plate (7) of the vertical type-one sliding device; the bottom end of the vertical steel rod is connected to the sliding plate (7) of the horizontal type-one sliding device, and the other end is not connected; The horizontal steel rod can be moved up and down by the vertical sliding device, and the vertical steel rod can be moved left and right by the horizontal sliding device.

5. The laboratory simulation method for interaction between humans and flexible structures according to claim 1, characterized in that: The axial stiffness adjustment device comprises an outer cylinder (10), a spring (11), a blocking piece (12), a pull rod (13) and an electronic dynamometer (14); One end of the pull rod (13) is connected to six springs (11), and the other end is hinged; the outer cylinder (10) is a hollow cylinder with a slit on one side of the cylinder wall and six holes on the bottom of the cylinder. The cylinder wall extends outward for a distance, and the top of the cylinder is hinged; the baffle (12) is located at the slit of the cylinder wall; the electronic dynamometer (14) is tied to the outer wall of the outer cylinder (10); The pull rod (13) provides a connection for the axial stiffness adjustment device structure; the spring (11) provides stiffness for the axial stiffness adjustment device; the outer cylinder (10) provides space for the movement of the pull rod (13) and the spring (11); the baffle (12) controls the effective length of the spring (11) participating in the force; the electronic dynamometer (14) displays the pressure exerted on the baffle; The pull rod (13) can move axially along the inner wall of the outer cylinder (10).

6. A laboratory simulation method for interaction between a person and a flexible structure according to claim 5, characterized in that: The outer diameter of the pull rod (13) is smaller than the inner diameter of the outer cylinder (10); the opening radius of the bottom of the outer cylinder (10) and the baffle (12) is larger than the outer diameter of the spring (11).

7. A laboratory simulation method for interaction between humans and flexible structures according to claim 5, characterized in that: One end of the horizontal axial stiffness adjustment device is hingedly connected to a sliding plate (7) in the vertical type I sliding device installed on the external steel frame (2), and the other end is hingedly connected to the left and right sides of the steel plate (4); The vertical sliding device installed on the external steel frame (2) enables the horizontal axial stiffness adjustment device to move up and down following the steel plate (4).

8. A laboratory simulation method for interaction between a person and a flexible structure according to claim 5, characterized in that: One end of the vertical axial stiffness adjustment device is hingedly connected to a sliding plate (7) of a horizontal type I sliding device installed on the top crossbeam of the external steel frame (2), and the other end is hingedly connected to the suspension rod (3).

9. The laboratory simulation method for interaction between humans and flexible structures according to claim 1, characterized in that: One end of the suspension rod (3) is hingedly connected to a sliding plate (7) of a horizontal type sliding device installed on a steel plate (4), and the other end is hingedly connected to one end of a vertical axial stiffness adjustment device.

10. A laboratory simulation method for interaction between humans and flexible structures according to claim 1, characterized in that: The torsional stiffness adjustment device comprises a main structure (15), a rack (16), a claw (17), a rotating steel bar (18), a rotating arm (19) and a rotating shaft (20); The main structure (15) provides support and installation position for the internal components of the torsional stiffness adjustment device. In addition, the main structure (15) has holes on the upper and lower and left and right four surfaces; the rack (16) is fixed to the front end of the main structure (15); the claw (17) is installed on the two horizontal bars at the front end of the main structure (15); the starting part of the spiral steel bar (18) is fixed on the two vertical bars of the main structure (15) to provide torsional stiffness for the torsional stiffness adjustment device, and the end part is a triangular hole. The rotating arm (19) is composed of a triangular steel sheet, a long steel sheet and a short steel sheet, the two corner ends of the triangular steel sheet are fixed to the triangular steel sheet at the end of the rotating steel bar (18) by bolts, the other corner end is connected to one end of the long steel sheet, one end of the short steel sheet is fixed to the end of the rotating shaft, and the other end of the short steel sheet is connected to the other end of the long steel sheet; the middle section of the long steel sheet is hollowed out, and the inward protrusion in the middle of the claw (17) passes through the hollowed-out part of the long steel sheet; The clamping claw (17) can move horizontally along the two horizontal bars of the main structure (15) and can be clamped on the rack (16) at the same time; the triangular steel plate in the rotating arm (19) can swing around the long steel plate, and the long steel plate in the rotating arm (19) can swing around one end of the short steel plate. The short steel plate in the rotating arm (19) swings with the rotation of the rotating shaft, driving the long steel plate to rotate around the inward protruding part of the clamping claw (17), and then driving the triangular steel plate in the rotating arm (19) and the triangular steel plate at the end of the rotating steel bar (18) to rotate.

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