External mechanical device for monitoring seismic deformation of buckling restrained brace

Abstract

The invention relates to an externally-attached mechanical device for earthquake deformation monitoring of a buckling restrained brace. The externally-attached mechanical device comprises a core energy consumption assembly, a peripheral restraining sleeve arranged outside the core energy consumption assembly in a sleeving mode and a mechanical evaluation device installed on the peripheral restraining sleeve. The mechanical evaluation device comprises a bottom plate fixed on the peripheral constraint sleeve, a transmission device which is fixedly mounted on the bottom plate and is used for responding and recording the displacement condition of the building structure caused by an earthquake, a triggering device matched with the transmission device for use, and a spring power device for providing rotational energy for the transmission device; the mechanical evaluation device solves the problems that existing BRB displacement monitoring mainly depends on a built-in sensor, depends on an external power supply in practical application, is poor in use effect and is difficult to meet the requirements of modern building structures for efficient, economical and reliable monitoring.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of building construction and relates to an external mechanical device for monitoring seismic deformation of buckling restrained braces. BACKGROUND

[0002] In recent years, buckling restrained braces (BRB) have been widely used in high-rise buildings, especially in high-rise frame structures or steel structures, due to their significant seismic mitigation effect. As shown in the BRB, it is usually composed of three parts: the core plate, the external sleeve and the filler material layer. The core plate is made of high ductility and low yield point material, which is the main energy dissipation component; the external sleeve is made of steel with high stiffness, which is used to prevent the core plate from buckling under compression; the core plate and the external sleeve are connected by the filler material, which allows the core plate to deform laterally under the Poisson effect and stretch and compress longitudinally under axial force. Under the action of earthquake, BRB absorbs and dissipates a large amount of seismic energy through the elastic or elastic-plastic deformation of the core plate, effectively improves the seismic performance of the structure and ensures the safety of the building. Figure 1 Under the action of strong earthquakes and other large deformation loads, the core plate of BRB enters the plastic deformation stage and absorbs and dissipates seismic energy through the plastic deformation of steel. Due to the existence of the external restraint member, the core plate can remain stable even under large deformation conditions and does not buckle and fail, thereby continuously playing the role of energy dissipation. This mechanism significantly reduces the seismic response of the structure and protects the main structure from serious damage. Therefore, the displacement of BRB is an important indicator for evaluating the stability, safety and health status of the building structure. By monitoring the displacement of BRB in real time and accurately, potential structural hazards can be found in time, providing scientific basis for the maintenance and reinforcement of the structure and ensuring that the building is always in a safe and reliable state.

[0003]

[0004] ​Currently, the displacement monitoring of BRB mainly relies on the built-in sensor technology, but this technology has many problems in practical application, which restricts its wide application and promotion. First of all, the wiring of the built-in sensor is complex, and a large number of cables and connection lines need to be arranged inside or around the BRB component during the construction process, which not only increases the construction difficulty and construction period, but also increases the complexity and cost of later maintenance. Secondly, the built-in sensor usually needs external power supply, depends on the external power system, and once the power is off or the power fails, the monitoring system may not work normally, resulting in interruption of monitoring data and affecting the continuity and reliability of structure safety evaluation. Thirdly, the cost of the built-in sensor itself is high, especially the high-precision and high-durability sensor, whose price often accounts for a large proportion of the total cost of the monitoring system, increasing the economic burden of the overall monitoring scheme. In addition, in some special scenes or complex environments, such as high temperature, high humidity, strong corrosion or space-limited structure parts, the installation and operation of the sensor face great difficulties, and even cannot be implemented, resulting in monitoring blind area and affecting the comprehensiveness and accuracy of structure safety monitoring. The existence of these problems makes the traditional built-in sensor monitoring method difficult to meet the demand of modern building structure for efficient, economical and reliable monitoring, and it is urgent to develop a more adaptable mechanical device for monitoring the seismic deformation of buckling-restrained brace. SUMMARY

[0005] Therefore, the application provides a mechanical device for monitoring the seismic deformation of buckling-restrained brace.

[0006] To achieve the above-mentioned purpose, the application provides the following technical scheme:

[0007] A mechanical device for monitoring the seismic deformation of buckling-restrained brace, comprising a core energy dissipation component, a peripheral constraint sleeve sleeved outside the core energy dissipation component, and a mechanical evaluation device installed on the peripheral constraint sleeve; the mechanical evaluation device comprises a bottom plate fixed on the peripheral constraint sleeve, a transmission device fixedly installed on the bottom plate for responding to and recording the displacement of the building structure caused by the earthquake, a trigger device used in cooperation with the transmission device, and a clockwork power device for providing rotation energy for the transmission device.

[0008] The transmission device comprises a driving rack rigidly connected with the core energy dissipation component, a gear I engaged with the driving rack, a gear II coaxial with the gear I and located below the gear I, a gear III engaged with the gear II, and a driven rack engaged with the gear III; a pencil is installed on the side of the driven rack close to the trigger device, a drawing paper fixing device for placing the time history curve paper is fixedly installed on the pencil tip side, and a gear IV connected with the clockwork power device is fixedly installed on the upper end of the drawing paper fixing device.

[0009] The trigger device comprises a roller and a rolling base arranged between the driven rack and the drawing paper fixing device for supporting the roller, the roller is fixedly installed with a clamping groove I on the rotating shaft near the side of the driven rack, and the rotating shaft of the roller near the side of the gear IV is fixedly installed with a clamping groove II for clamping the gear IV, the upper gear IV is clamped by the protrusion of the clamping groove II, and the energy loss of the clockwork power device is avoided.

[0010] Further, the core energy consumption component comprises a reinforcing rib plate and an inner core plate, the reinforcing rib plate is located at both ends of the inner core plate, and the driving rack is arranged parallel to the inner core plate in the core energy consumption component.

[0011] Further, the driven rack is perpendicular to the driving rack and located below the driving rack.

[0012] Further, a spring is arranged between the pencil and the driven rack, one end of the spring is fixed on the driven rack, and the other end is fixed on the pencil.

[0013] Further, the drawing paper fixing device comprises support columns fixedly installed on the bottom plate and drawing paper rollers rotatably connected between the upper and lower ends of the support columns, the drawing paper rollers are used for placing time history curve paper for recording the displacement of the building structure, the support columns are fixedly installed with drawing paper clamping positions for fixing and supporting the time history curve paper, and the gear IV is fixedly installed on one end of the drawing paper roller at the upper end of the support column.

[0014] Further, a slot is formed in the support column, and a drawing paper bottom plate for supporting the time history curve paper is inserted into the slot.

[0015] Further, two triangular clamping positions for clamping the clamping groove I are fixedly installed on the driven rack.

[0016] Further, the clockwork power device comprises a clockwork upper gear, a clockwork lower gear coaxial with the clockwork upper gear, and a gear V for transmitting the power of the clockwork power device and engaging with the clockwork upper gear, the gear V and the gear IV are connected through a transfer idler, the transfer idler engages with the gear IV and the gear V, the outer side of the clockwork lower gear engages with a gear VI, and the gear VI engages with a conversion gear with an upper clockwork rotating shaft.

[0017] Further, an anti-skid ring made of rubber is sleeved on the upper clockwork rotating shaft.

[0018] Further, a stop pawl for limiting the rotating direction of the clockwork lower gear is arranged on the bottom plate outside the clockwork lower gear.

[0019] Further, a sliding rail I for limiting the driving rack and a sliding rail II for limiting the driven rack are arranged on the bottom plate.

[0020] Further, a protective cover is arranged on the bottom plate for protecting the transmission device, the triggering device and the clockwork power device.

[0021] The present application has the advantages of:

[0022] 1、The external mechanical device for monitoring earthquake deformation of the buckling restrained brace disclosed in the application, the driving rack in the transmission device is arranged parallel to the inner core plate in the core energy consumption component, and the driving rack is fixedly connected to the inner core plate through the connecting rod, so that when the earthquake occurs, the back and forth deformation of the inner core plate caused by the displacement of the building structure will synchronously cause the back and forth movement of the driving rack, and then the displacement is recorded through the time curve paper of the pencil on the fixed device of the drawing paper, so that the subsequent evaluation and analysis of the earthquake situation are facilitated, and the safety state of the building is more accurately and scientifically evaluated. The power source of the entire mechanical evaluation device adopts the clockwork principle similar to a mechanical clock, and is free from the dependence on wiring and external power supply in the traditional monitoring mode, so that the monitoring cost is reduced, and the flexibility and adaptability of the monitoring system are improved.

[0023] 2、The external mechanical device for monitoring earthquake deformation of the buckling restrained brace disclosed in the application, the triggering device is ingeniously designed, after the earthquake occurs, the driving rack in the transmission device moves back and forth with the inner core plate in the core energy consumption component, so that the triangular clamping position on the driven rack moves the clamping groove I on the triggering device roller, the roller is separated from the rolling base, the clamping groove II is separated from the gear IV, the clockwork power device is started, and then the drawing paper roller is driven to rotate, and the displacement of the building caused by the earthquake disaster is recorded on the time curve paper while being gradually consumed by the inner core plate, so that the subsequent analysis of the earthquake disaster system by researchers is facilitated, and strong data support can be provided for the safety use evaluation of the post-disaster building.

[0024] Other advantages, objects, and features of the application will be apparent to those skilled in the art from the following specification, and it is intended to cover any alternatives, modifications, or equivalents included within the scope of the application. The objectives and other advantages of the application will be realized and attained by the structure particularly pointed out in the specification. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to make the purposes, technical solutions and advantages of the application clearer, the preferred detailed description of the application will be made below in combination with the drawings, in which:

[0026] Figure 1 A structural schematic diagram of the existing buckling restrained brace;

[0027] Figure 2 A structural schematic diagram of the buckling restrained brace core plate with the mechanical evaluation device for deformation monitoring according to the application;

[0028] Figure 3 Structure diagram of the external mechanical device for monitoring the seismic deformation of the buckling-restrained brace of the present application Figure 1

[0029] Figure 4 Structure diagram of the external mechanical device for monitoring the seismic deformation of the buckling-restrained brace of the present application Figure 2

[0030] Figure 5 Structure diagram of the external mechanical device for monitoring the seismic deformation of the buckling-restrained brace of the present application Figure 3

[0031] Figure 6 Top view of the external mechanical device for monitoring the seismic deformation of the buckling-restrained brace of the present application

[0032] Figure 7 Structure diagram of the transmission device in the present application Figure 3

[0033] Figure 8 Structure diagram of the drawing paper fixing device in the present application Figure 7 Figure 1

[0034] Figure 9 Structure diagram of the drawing paper fixing device in the present application Figure 7 Figure 2

[0035] Figure 10 Installation diagram of the drawing paper clamping device in the present application Figure 9

[0036] Figure 11 Structure diagram of the trigger device in the present application Figure 3 Figure 1

[0037] Figure 12 Structure diagram of the trigger device in the present application Figure 3 Figure 2

[0038] Figure 3~6 Structure diagram of the trigger device in the present application Figure 7 Figure 4

[0039] Figure 8 Structure diagram of the clockwork power device in the present application Figure 10

[0040] ​​​​​​​​​​​​​​​​Figure numerals: core energy-consuming component 1, peripheral constraint sleeve 2, mechanical evaluation device 3, connecting rod 4, base plate 5, transmission device 31, active rack 311, gear I 312, gear II 313, gear III 314, driven rack 315, pencil 316, spring 317, slide rail I 318, slide rail II 319, support column 3110, drawing paper roller 3111, drawing paper base 3112, gear IV 3113, drawing paper position 3114, trigger device 32, roller 321, rolling base 322, slot I 323, slot II 324, spring power device 33, spring upper gear 331, spring lower gear 332, gear V 333, conversion gear 334, spring shaft 335, transfer idler 336, gear VI 337, stop pawl 338. DETAILED DESCRIPTION

[0041] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different viewpoints and applications without departing from the spirit of the present invention.

[0042] like Figure 11~13 The buckling restraint support core plate with a mechanical evaluation device for deformation monitoring shown includes a core energy dissipation component 1, a peripheral restraint sleeve 2 mounted outside the core energy dissipation component 1, and a mechanical evaluation device 3 installed on the peripheral restraint sleeve 2. The core energy dissipation component 1 and the peripheral restraint sleeve 2 are filled with sliding material so that the core energy dissipation component 1 can undergo lateral deformation under the Poisson effect and realize longitudinal stretching and compression under the action of axial force.

[0043] The core energy dissipation assembly 1 comprises stiffener plates and an inner core plate. The stiffener plates are located at each end of the inner core plate and connect to the building structure. The inner core plate is located in the center of the core energy dissipation assembly. The inner core plate is primarily designed to withstand tension and compression and dissipate seismic energy through yielding. The stiffener plates are typically cross-shaped or straight-shaped steel plates. A peripheral restraining sleeve 2, constructed of high-rigidity steel and extending at least around the outer periphery of the inner core plate, prevents the inner core plate from buckling under compression.

[0044] like Figure 14The illustrated external mechanical device for monitoring earthquake deformation in a buckling-restrained brace includes a mechanical evaluation device 3 that responds to and records structural displacement caused by earthquakes, a trigger device 32 that cooperates with the transmission device 31, and a mechanical spring power device 33 that provides rotational energy for the transmission device 31. The mechanical evaluation device 3 also includes a base plate 5 for securing the transmission device 31, the trigger device 32, and the spring power device 33. The base plate 5 is secured to the peripheral restraining sleeve 2 and is provided with a protective cover for protecting the transmission device 31, the trigger device 32, and the spring power device 33.

[0045] like ​ The transmission device 31 shown includes an active rack 311 and a gear I 312 meshing with the active rack (as there is no such gear in the model library). ​ Gear I 312 is replaced by a cylinder), gear II 313 is coaxial with gear I 312 and located below gear I 312, gear III 314 meshes with gear II 313, and a driven rack 315 meshes with gear III 314. The driven rack 315 is perpendicular to the driving rack 311 and is located below the driving rack 311. Slide rails I 318 and II 319 are provided on the base plate 5 for limiting the position of the driving rack and the driven rack. Gear II 313 is fixed to gear I 312 to reduce the response displacement to 1 / 2, and then gear III 314 reduces the response displacement to 1 / 4 of the original displacement. This leaves ample space for displacement along the entire upward and downward sliding trajectory of the driving rack 311, as there are no other obstacles. Gear I 311 and gear II 313 are fixed to the base plate 5 via coaxial rotating shafts, and gear III 314 is also fixed to the base plate 5 via its rotating shaft.

[0046] A pencil 316 is installed on one side of the driven rack 315 close to the trigger device 32 , and a spring 317 is provided between the pencil 316 and the driven rack 315 . One end of the spring 317 is fixed to the driven rack 315 , and the other end is fixed to the pencil 316 .

[0047] like ​ 、 9 The tip of the pencil 316 is fixedly mounted with a drawing paper fixing device, which includes a support column 3110 fixedly mounted on the base plate 5 and a drawing paper roller 3111 rotatably connected between the upper and lower ends of the support column 3110. The drawing paper roller 3111 is used to place a time-course curve paper for recording the displacement of the building structure. The support column 3110 is provided with a slot, and a drawing paper base plate 3112 is inserted into the slot to facilitate supporting the time-course curve paper. ​As shown, the support column 3110 is fixedly installed with a drawing paper clamping device 3114 for fixing the support time history curve paper, and the two drawing paper clamping devices 3114 are oppositely arranged. One end of the drawing paper roller 3111 at the upper end of the support column 3110 is fixedly installed with a gear IV 31313.

[0048] The pitch circle radius of the gear I 312 is 0.5 cm, the pitch circle radius of the gear II 313 is 1 cm, the pitch circle radius of the gear III 314 is 2 cm, and the pitch circle radius of the gear IV 31313 is 1.25 cm.

[0049] The setting of the driving rack 311 is parallel to the core core plate in the core energy consumption assembly 1, and the driving rack 311 is fixedly connected to the core core plate through the connecting rod 4. Thus, when the earthquake occurs, the back and forth deformation of the core core plate caused by the displacement of the building structure will synchronously cause the back and forth movement of the driving rack 311, and then the displacement of the driving rack 311 will be recorded on the time history curve paper through the side pencil 316 of the driven rack 315, which is convenient for subsequent analysis of the earthquake situation.

[0050] As shown in ​ The trigger device 32 includes a roller 321 and a rolling base 322 arranged between the driven rack 315 and the drawing paper fixing device for supporting the roller 321. The roller 321 is fixedly installed with a clamping groove I 323 on the rotating shaft near the side of the driven rack 315. The driven rack 315 is fixedly installed with two triangular clamping devices for clamping the clamping groove I 323. The distance between the clamping devices is slightly greater than the width of the clamping groove I 323. The back and forth movement of the driven rack 315 drives the left and right movement of the clamping groove I 323. The rotating shaft near the side of the gear IV 31313 of the roller 321 is fixedly installed with a clamping groove II 324 for clamping the gear IV 31313 through a connecting shaft. The clamping groove II 324 clamps the upper gear IV 31313 to avoid the energy loss of the clockwork power device 33. The upper end of the rolling base 322 is in the shape of an arc-shaped slide rail, and the roller 321 can be limited in the arc-shaped slide rail in the untriggered state.

[0051] The working principle of the trigger device 32 is as follows: when the earthquake comes, the driven rack 315 is triggered, and the triangular clamping devices on the driven rack 315 drive the movement of the upper clamping groove I 323. The clamping groove I 323 drives the movement of the roller 321 through the rotating shaft. When the roller 321 moves to the top end of the arc-shaped slide rail at the upper end of the rolling base 322, the roller 321 moves out of the range of the arc-shaped slide rail and falls to the bottom plate 5. At this time, the clamping groove I 323 and the clamping groove II 324 form a height difference with the initial position, and cannot play a clamping role. The trigger device exits the work, and the whole device normally operates.

[0052] As shown in ​The spring power device 33 uses the spring principle to store power for the whole device. It is worth noting that the power output of the spring will become slower and slower over time. To avoid this problem, the spring power device 33 stores about 10 hours of spring power, and the device triggers to record the end of the few minutes of approximate uniform rotation by lengthening the whole energy output time.

[0053] The spring power device 33 includes a spring upper gear 331, a spring lower gear 332 coaxial with the spring upper gear 331, and a gear V 333 for transmitting power of the spring power device 33 and engaging with the spring upper gear 331. The gear V 333 is connected between the gear IV 3113 through a transfer idler 336, the transfer idler 336 engages with the gear IV 3113 and the gear V 333 respectively, the outer side of the spring lower gear 332 engages with a gear VI 337, and the gear VI 337 engages with a conversion gear 334 with an upper spring shaft 335. The upper spring shaft 335 is sleeved with a rubber anti-slip ring. The pitch circle radius of the spring upper gear 331 is 2 cm, the pitch circle radius of the spring lower gear 332 is 1 cm, the pitch circle radius of the gear V 333 is 1 cm, the pitch circle radius of the gear VI 337 is 1 cm, and the pitch circle radius of the conversion gear 334 is 2 cm. The spring is arranged in the spring upper gear 331. A ratchet-like detent device is arranged on the bottom plate 5 outside the spring lower gear 332

[0054] It is also worth noting that a stop pawl 338 similar to the ratchet detent device can also be arranged on the bottom plate 5 outside the spring lower gear 332, so that the spring lower gear 332 can only rotate in one direction, preventing energy loss of the spring. The stop pawl 338 is rotationally connected to a fixed shaft, and the fixed shaft is fixedly connected to the bottom plate 5.

[0055] The working principle of the external mechanical device for monitoring the seismic deformation of the buckling restrained brace is as follows: when a seismic disaster occurs, the active rack 311 is arranged parallel to the inner core plate in the core energy dissipation assembly 1, and the active rack 311 is fixedly connected to the inner core plate through the connecting rod 4. Thus, the displacement state of the active rack 311 is the same as the deformation of the inner core plate in the core energy dissipation assembly 1. The displacement of the active rack 311 is transmitted through a series of gears, including gear I 312, gear II 313 below gear I 312, gear III 314 engaging with gear II 313, and driven rack 315 engaging with gear III 314, resulting in the driven rack 315 driving the connected pencil 316 to move horizontally.

[0056] The lateral displacement of the driven rack 315 will drive the card slot I 323 left and right through the triangular card slot, and the card slot I 323 will drive the roller 321 to move through the rotating shaft. When the roller 321 moves to the top end of the arc-shaped slide rail on the rolling base 322, it will continue to move to make the roller 321 leave the arc-shaped slide rail range and fall to the bottom plate 5. At this time, the card slot I 323 and the card slot II 324 are both different in height from the initial position, and cannot play a clamping role. The trigger device 32 exits the work, and the clockwork power device 33 starts.

[0057] The principle of the clockwork power device 33 is the same as that of a mechanical clock. The clockwork power device 33 is pre-stored with about 10 hours of clockwork amount. After the clockwork power device 33 is started, the clockwork power device 33 is connected with the gear IV 31113 through the conversion gear 334, the gear VI 337, the clockwork lower gear 332, the clockwork upper gear 331, the gear V 333, the switching idler 336, and the gear IV 31113, and then drives the paper roller 3111 to rotate, and then continuously records the displacement of the building caused by the earthquake disaster.

[0058] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced equivalently without departing from the purpose and scope of the technical solutions, which should be covered in the scope of the claims of the present application.

Claims

1. An external mechanical device for monitoring earthquake deformation of a buckling restrained support, characterized in that: The invention comprises a core energy dissipation component (1), a peripheral constraint sleeve (2) sleeved outside the core energy dissipation component (1), and a mechanical evaluation device (3) mounted on the peripheral constraint sleeve (2); the mechanical evaluation device (3) comprises a base plate (5) fixed on the peripheral constraint sleeve (2), a transmission device (31) fixedly mounted on the base plate (5) for responding to and recording the displacement of the building structure caused by an earthquake, a trigger device (32) used in conjunction with the transmission device (31), and a clockwork power device (33) for providing rotational energy to the transmission device (31); The transmission device (31) includes an active rack (311) rigidly connected to the core energy dissipation component (1), a gear I (312) meshing with the active rack, a gear II (313) coaxial with the gear I (312) and located below the gear I (312), a gear III (314) meshing with the gear II (313), and a driven rack (315) meshing with the gear III (314), a pencil (316) being installed on a side of the driven rack (315) close to the trigger device (32), a drawing paper fixing device for placing time history curve paper being fixedly installed on one side of the tip of the pencil (316), and a gear IV (3113) connected to the spring power device (33) being fixedly installed on the upper end of the drawing paper fixing device; The trigger device (32) includes a roller (321) and a rolling base (322) arranged between the driven rack (315) and the drawing paper fixing device for supporting the roller (321). A clamping groove I (323) is fixedly installed on the rotating shaft of the roller (321) on the side close to the driven rack (315). A clamping groove II (324) is fixedly installed on the rotating shaft of the roller (321) on the side close to the gear IV (3113) through a connecting shaft. The upper gear IV (3113) is clamped by the protrusion of the clamping groove II (324), thereby avoiding energy loss of the clockwork power device (33).

2. The external mechanical device for monitoring earthquake deformation of a buckling restrained brace according to claim 1, characterized in that: The core energy dissipation component (1) comprises a reinforcing rib plate and an inner core plate, wherein the reinforcing rib plate is located at both ends of the inner core plate, the active rack (311) is arranged parallel to the inner core plate in the core energy dissipation component (1), and the extended end of the active rack (311) is fixedly connected to the inner core plate via a connecting rod (4).

3. The external mechanical device for monitoring earthquake deformation of a buckling restrained brace according to claim 2, characterized in that: The driven rack (315) and the active rack (311) are perpendicular to each other, and the driven rack (315) is located below the active rack (311).

4. The external mechanical device for monitoring earthquake deformation of a buckling restrained brace according to claim 3, characterized in that: A spring (317) is provided between the pencil (316) and the driven rack (315), one end of the spring (317) being fixed to the driven rack (315), and the other end being fixed to the pencil (316).

5. The external mechanical device for monitoring earthquake deformation of a buckling restrained brace according to claim 1, characterized in that: The drawing paper fixing device comprises a support column (3110) fixedly mounted on the bottom plate (5) and a drawing paper roller (3111) rotatably connected between the upper and lower ends of the support column (3110); the drawing paper roller (3111) is used to place time-course curve paper for recording the displacement of the building structure; a drawing paper clamp (3114) for fixing the time-course curve paper is fixedly mounted on the support column (3110); and a gear IV (3113) is fixedly mounted on one end of the drawing paper roller (3111) at the upper end of the support column (3110).

6. The external mechanical device for monitoring earthquake deformation of a buckling restrained brace according to claim 5, characterized in that: The support column (3110) is provided with a slot, into which a drawing paper base plate (3112) for supporting the time course curve paper is inserted.

7. The external mechanical device for monitoring earthquake deformation of a buckling restrained brace according to claim 6, characterized in that: Two triangular latching positions for latching the latching slot I (323) are fixedly mounted on the driven rack (315).

8. The external mechanical device for monitoring earthquake deformation of a buckling restrained brace according to claim 7, characterized in that: The spring power device (33) comprises a spring upper gear (331), a spring lower gear (332) coaxial with the spring upper gear (331), and a gear V (333) for transmitting power of the spring power device (33) and meshing with the spring upper gear (331). The gear V (333) is connected to the gear IV (3113) via a transfer idler wheel (336). The transfer idler wheel (336) is meshed with the gear IV (3113) and the gear V (333) respectively. The outer side of the spring lower gear (332) is meshed with a gear VI (337). The gear VI (337) is meshed with a conversion gear (334) with a spring rotating shaft (335).

9. The external mechanical device for monitoring earthquake deformation of a buckling restrained brace according to claim 8, characterized in that: A stop pawl (338) for limiting the rotation direction of the spring lower gear (332) is provided on the bottom plate (5) outside the spring lower gear (332).

10. The external mechanical device for monitoring earthquake deformation of a buckling restrained brace according to claim 9, characterized in that: The winding spring shaft (335) is sleeved with a rubber anti-slip ring.

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