CN105243934B - A kind of experiment device for teaching for intuitively changing force method - Google Patents
A kind of experiment device for teaching for intuitively changing force method Download PDFInfo
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- CN105243934B CN105243934B CN201510712334.6A CN201510712334A CN105243934B CN 105243934 B CN105243934 B CN 105243934B CN 201510712334 A CN201510712334 A CN 201510712334A CN 105243934 B CN105243934 B CN 105243934B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
- G09B23/06—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics
- G09B23/08—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for statics or dynamics
- G09B23/10—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for statics or dynamics of solid bodies
Abstract
The present invention provides a kind of experiment device for teaching for intuitively changing force method, and the device includes rigid-framed structure, loading device, support and restraint device and measuring apparatus.Rigid-framed structure is formed by connecting by horizontal and vertical two orthogonal hollow square bars by rigid joint disk；Loading device includes worm and gear loading device and counterweight loading device, realizes the loading to rigid-framed structure；Supporting and restraint device include constraint supporting and the reaction frame of rigid-framed structure, and the constraint support of rigid-framed structure includes hold-down support and hinged-support, reaction frame reaction frame and base composition；Measuring apparatus includes force snesor, foil gauge and stay wire displacement sensor.Device structure set Experiments of Machanics model, loading device and the measurement apparatus are in one, experimental model flexibility and changeability；According to the needs of experiment content, different branch's experimental models can be assembled, carry out the force method experiment of a variety of methods, various method acquired results are easy to be compared and contrasted with notional result.
Description
Technical field
The invention belongs to civil engineering structural mechanics experimental teaching field, it is related to a kind of teaching for intuitively changing force method
Experimental provision.
Background technology
Structural mechanics is the required subject of institution of higher learning's civil engineering, and force method therein is that structural mechanics solution is super quiet
Determine structure internal force and basic skills of displacement under static load.
Redundant structure is computationally different from statically determinate structure, and the internal force of redundant structure can not be singly from static balance condition
Obtain, it is necessary to while consider deformation compatibility condition.For the convenience of computational problem, often in all unknown quantitys of redundant structure
A portion is chosen as fundamental unknown variables.Force method is to take some masterpiece fundamental unknown variables, is asked according to deformation compatibility condition
Solve a kind of method of redundant structure.
The teaching method of institution of higher learning's structural mechanics is mainly theory teaching at present, due to lacking the experiment to correlation theory
Checking, can cause understanding of the part classmate to correlation theory not deep enough, or even thrown doubt upon to correlation theory unavoidably.High
The inexorable trend that experiment content is Teaching of Structural Mechanics development from now on is introduced in the daily teaching of universities and colleges' structural mechanics.
The content of the invention
In view of the shortcomings of the prior art, change the present situation for lacking related experiment content in current Teaching of Structural Mechanics, invent
A kind of experiment device for teaching for intuitively changing force method, the experiment device for teaching can realize the reality of the structural mechanics force method content of courses
Testing, the checking to force method theory is realized, and by testing the reason for finding out experimental error with theoretical difference, classmates is existed
In personal practice and analysis, deeper into the knowwhy for understanding displacement method.
Technical scheme is as follows：
A kind of experiment device for teaching for intuitively changing force method include rigid-framed structure, loading device, support and restraint device and
Measuring apparatus.
The rigid-framed structure is by vertical hollow square bar 3a, laterally hollow square bar 3b and the first rigid joint disk 4a is formed.Vertically
Hollow square bar 3a one end is connected by bolt with reeded first rigid joint disk 4a；The other end by bolt with fluted
The second rigid joint disk 4b be connected, realize the connection of rigid-framed structure and hold-down support.Laterally hollow square bar 3b one end passes through bolt
It is connected with reeded first rigid joint disk 4a；The other end is connected by bolt with reeded pin joint disk 5, is realized firm
Frame structure is connected with hinged-support.Rigid joint disk and pin joint disk use with institute's link member identical rigidity, pass through bolt and knot
Point disk connects the rigidity model such as to form.
The loading device is made up of worm and gear loading device and counterweight loading device.The worm and gear loading device
It is made up of worm and gear lift 6, load bar 9, ball pivot 8 and rod member fixture 10；The one end of worm and gear lift 6 by bolt with
First trolley platform 12a is fixedly connected, and the first trolley platform 12a is installed on the guide rail of reaction frame 1 by four pieces of sliding blocks of bottom,
First trolley platform 12a can arbitrarily adjust height along the guide rail of reaction frame 1；The other end of worm and gear lift 6 passes through screw thread and power
Sensor 7 is connected, and worm and gear lift 6 is further applied load by rotation hand wheel to rigid-framed structure；Force snesor 7 by screw thread with
Ball pivot 8 is connected, and ball pivot 8 is connected by screw thread with load bar 9, and load bar 9 is connected by screw thread with rod member fixture 10, and ball pivot 8 is logical
That crosses its own freely rotates the influence for avoiding loading device from producing moment of flexure to rigid-framed structure；Rod member fixture 10 include pin 21,
Load joint element for bar 20 and two pieces of different size of rod member intermediate plates 22；There are pin-and-hole, load bar connection in the big side of rod member intermediate plate 22
There is pin-and-hole the side of part 20, and the two is linked together by pin 21；Vertical hollow square bar 3a passes perpendicularly through two pieces of rod member intermediate plates
22 grooves formed, have four bolts hole on every piece of rod member intermediate plate 22, by bolt by rectangular thin-wall rod member 3a and rod member intermediate plate
22 connections；Rod member fixture 10 can realize that loading device is connected with the hollow square bar 3a of laterally hollow square bar 3b or vertical, lead to simultaneously
Cross the latch structure of rod member fixture 10 and avoid moment of flexure transmission.By worm and gear loading device, realize the loading to rigid-framed structure with unloading
Carry, worm and gear loading device is manually controllable to apply pulling force and pressure, and institute's loading is shown on computers by force snesor 7
Carry, realize the loading and unloading of rigid-framed structure.
The counterweight loading device is made up of counterweight, pallet 18, Height Adjustable fixed pulley 19；Counterweight loading device is fixed
On pin joint disk 5, by counterweight loading device, the application to rigid-framed structure vertical load and horizontal loading is realized.
Support and restraint device are made up of the constraint support of reaction frame and rigid-framed structure.
The rigid-framed structure flexible form is changeable, can form the diversified forms such as " L " shape rigid frame OR gate shape rigid frame, rigid-framed structure
It is made up of reaction frame 1 and base 2；Base 2 is fixed on the sill bottom of reaction frame 1, for supporting whole device；The counter-force
Frame 1 is made up of two crossbeams up and down of built-in guide rail and the column of left and right two of built-in guide rail, can be with each crossbeam and column
Fixed worm and gear lift 6 and trolley platform, sill fix the second trolley platform 12b, and a heel post fixes the first dolly
Platform 12a.
The constraint support of the rigid-framed structure includes hold-down support and fixed-hinged support.Hold-down support is by first level bearing
Sensor 11a, the first vertical bearing sensor 11b and the second rigid joint disk 4b compositions, two bearing sensors are fixed on counter-force
On frame；Pinboard bottom is connected by bolt with the second trolley platform 12b, and pinboard side passes through bolt and first level bearing
Sensor 11a is connected；Reeded second rigid joint disk 4b is arranged in first level bearing sensor 11a insertions, by bolt and its
Connection；First vertical bearing sensor 11b upper ends are inserted in the second rigid joint disk 4b, and lower end passes through bolt and the second trolley platform
12b connections, the second trolley platform 12b are fixed on reaction frame sill.Fixed-hinged support is by the second horizontal seat sensor
11c, the second vertical bearing sensor 11d, pin joint disk 5, hinged-support horizontal guide rail 13a and hinged-support vertical guide 13b compositions,
Second horizontal seat sensor 11c is detachable, fixed-hinged support is changed into movable hinged shoe；Second horizontal seat sensor
The vertical bearing sensor 11d one end insertions of 11c and second are arranged in reeded pin joint disk 5, and are connected thereto by bolt；The
The two vertical bearing sensor 11d other ends are connected by the 4th trolley platform 12d with hinged-support horizontal guide rail 13a, and second is horizontal
The bearing sensor 11c other ends are connected by the 3rd trolley platform 12c with hinged-support upright guide rail 13b.Hinged-support horizontal guide rail
13a is arranged on box platform 16 by bolt；Hinged-support upright guide rail 13b is arranged on pinboard side by bolt, switching
Plate opposite side is connected with connector 14, and pinboard bottom is connected to hinged-support horizontal guide rail 13a by the 5th trolley platform 12e
On.Screw-threaded shaft elevator 15 is arranged on the side of box platform 16, is connected by connector 14 with pinboard, available for rigid-framed structure
Limitation applies horizontal displacement, and box platform 16 is fixed on reaction frame sill.
Measuring apparatus includes force snesor 7, foil gauge, horizontal guy displacement transducer 17a and vertical bracing wire displacement sensing
Device 17b.Force snesor 7 measures the payload values that worm and gear lift 6 is applied to rigid-framed structure；Strain gauge adhesion is vertical empty
Heart square bar 3a and laterally hollow square bar 3b both sides diverse location, pass through surveyed strain value and calculate rod member internal force size；Bracing wire displacement
Sensor can measure the displacement of measuring point horizontally and vertically；Above measuring apparatus is connected by data acquisition and analysis system and computer
Connect, each item data is monitored in real time by computer.
The beneficial effects of the invention are as follows：According to the needs of experiment content, different branches can be assembled out in force method experimental provision
Experimental model, the force method experiment of a variety of methods can be carried out, various method acquired results are easy to be compared and and notional result
Contrast.Device structure set Experiments of Machanics model, loading device and the measurement apparatus, can be with according to the needs of experiment content in one
Foil gauge is pasted in the diverse location of rod member, is loaded in the diverse location of rod member, experimental model flexibility and changeability.By testing
Card, this force method experimental provision experimental results error very little compared with structural mechanics calculates gained theoretical value, suitable colleges and universities open
Open up related teaching experiment and further design expansion.
Brief description of the drawings
Fig. 1 is force method experiment device for teaching original structure figure.
Fig. 2 is that force method experiment device for teaching load acts solely on static determinacy basic block diagram.
Fig. 3 is that the vertical counter-force of force method experiment device for teaching acts solely on static determinacy basic block diagram.
Fig. 4 is that force method experiment device for teaching horizontal reacting force acts solely on static determinacy basic block diagram.
Fig. 5 is that force method experiment device for teaching load acts solely on once indeterminate basic block diagram.
Fig. 6 is that force method experiment device for teaching horizontal reacting force acts solely on once indeterminate basic block diagram.
Fig. 7 is force method experiment device for teaching detail of construction.
Fig. 8 is force method experiment device for teaching worm wheel helical loading device detail drawing.
Fig. 9 is force method experiment device for teaching means for jointing rods detail drawing.
In figure：1 reaction frame；2 bases；The vertical hollow square bars of 3a；The horizontal hollow square bars of 3b；4a the first rigid joint disks；4b
Two rigid joint disks；5 pin joint disks；6 worm and gear lifts；7 force snesors；8 ball pivots；9 load bars；10 rod member fixtures；11a
One horizontal seat sensor；The vertical bearing sensors of 11b first；11c the second horizontal seat sensors；The second vertical bearings of 11d
Sensor；The trolley platforms of 12a first；The trolley platforms of 12b second；The trolley platforms of 12c the 3rd；The trolley platforms of 12d the 4th；12e
Five trolley platforms；The trolley platforms of 12f the 6th；The trolley platforms of 12g the 7th；13a hinged-support horizontal guide rails；13b hinged-supports are vertically led
Rail；14 connectors；15 screw-threaded shaft elevators；16 box platforms；17a horizontal guy displacement transducers；The vertical bracing wire displacement sensings of 17b
Device；18 pallets；19 Height Adjustable fixed pulleys；20 loading joint element for bar；21 pins；22 rod member intermediate plates.
Embodiment
The present invention by remove portion of standoff constrain rigid-framed structure, be individually further applied load on rigid frame rod member and
Apply at removed support restraint and constrain external force in the same direction, measure the internal force of structure and displacement in each branch's experiment.Using
Force method principle, the internal force and displacement of structure under load and each external force independent role are overlapped, solve load action in rigid frame
Internal force and displacement in structure, verify the correctness of force method principle.
Embodiments of the present invention are described further with reference to the accompanying drawings and examples.
It is a kind of by the experiment device for teaching that force method is intuitively changed by rigid-framed structure, loading device, support and restraint device, measurement
Equipment forms, and the experiment device for teaching original structure figure is as shown in figure 1, the specific mounting means of equipment is as follows：
Reaction frame 1 and base 2 form reaction frame；
Rigid-framed structure is by two orthogonal vertical hollow square bar 3a and laterally hollow square bar 3b passes through the first rigid joint
Disk 4a is formed by connecting.Vertical hollow square bar 3a one end is connected by bolt with reeded first rigid joint disk 4a；The other end
It is connected by bolt with reeded second rigid joint disk 4b, realizes the connection of rigid-framed structure and hold-down support.It is laterally hollow
Square bar 3b one end is connected by bolt with reeded first rigid joint disk 4a；The other end is by bolt and with reeded hinge
Node disk 5 is connected, and realizes that rigid-framed structure is connected with fixed-hinged support.Rigid joint disk and pin joint disk use and institute's link member
Identical rigidity, it is connected with node disk the rigidity model such as to form by bolt.Fixed-hinged support is arranged on box platform 16, Gu
Due on the sill of reaction frame 1.
Worm and gear loading device is by worm and gear lift 6, force snesor 7, ball pivot 8, load bar 9 and rod member fixture 10
It is formed by connecting from beginning to end successively.The one end of worm and gear lift 6 is fixedly connected by bolt with the first trolley platform 12a, and first is small
Car platform 12a is installed on the guide rail of reaction frame 1 by four pieces of sliding blocks of bottom, and height can be arbitrarily adjusted along the guide rail of reaction frame 1；Snail
The other end of worm and gear lift 6 is connected by screw thread with force snesor 7；Rod member fixture 10 is connected on vertical hollow square bar 3a,
Rigid-framed structure is further applied load.
Embodiment 1：Force method of the free inverted "L" shaped statically determinate rigid frame structure in one end as basic structure is fixed using one end to test
Fig. 2 is that force method experiment device for teaching load acts solely on static determinacy basic block diagram, and the mounting means of Fig. 2 structures is
On the basis of Fig. 1 structures.Horizontal guy displacement transducer 17a and vertical stay wire displacement sensor 17b one end are fixed on counter-force
On frame 1, the other end is connected on pin joint disk 5 by bracing wire.The vertical hollow square bar 3a of worm and gear loading device connection applies
Load, while corresponding shift value is measured by horizontal guy displacement transducer 17a and vertical stay wire displacement sensor 17b.
Fig. 3 is that the vertical counter-force of force method experiment device for teaching acts solely on static determinacy basic block diagram, rigid-framed structure and bracing wire
Displacement transducer connected mode is identical with Fig. 2.By steel wire rope connecting trays 18 on pin joint disk 5, weight is added on pallet 18
Code applies vertical load to rigid-framed structure in pin joint Pan5Chu, while by horizontal guy displacement transducer 17a and vertical bracing wire position
Displacement sensor 17b measures corresponding shift value.
Fig. 4 force method experiment device for teaching horizontal reacting forces act solely on static determinacy basic block diagram, steel frame construction and bracing wire position
The connected mode of displacement sensor 17 is identical with Fig. 2.Connected on pin joint disk 5 by steel wire rope around Height Adjustable fixed pulley 19
Pallet 18, counterweight is added on pallet 18.In loading procedure, by adjusting the leading screw being connected with Height Adjustable fixed pulley 19
Lift 15, make Height Adjustable fixed pulley 19 and rigid-framed structure highly identical, so as to realize to the horizontal lotus of rigid-framed structure application
Carry, while corresponding shift value is measured by horizontal guy displacement transducer 17a and vertical stay wire displacement sensor 17b.
Embodiment 2：Statically indeterminate rigid frame structure of inverted "L" shaped of one end constraint vertical displacement is fixed as basic knot using one end
The force method experiment of structure
Fig. 5 force method experiment device for teaching loads act solely on once indeterminate basic block diagram.Rigid-framed structure is by two
Orthogonal vertical hollow square bar 3a and horizontal hollow square bar 3b are formed by connecting by the first rigid joint disk 4a.Vertical hollow side
Bar 3a one end is connected by bolt with reeded first rigid joint disk 4a；The other end it is logical with by rigid joint disk 4, horizontal and perpendicular
It is connected to bearing sensor 11 with the hold-down support that trolley platform 12 forms；Horizontal hollow square bar 3b one end is by bolt with carrying
First rigid joint disk 4a of groove is connected；The other end by pin joint disk 5, vertical support sensor 11d and hinged-support level with being led
The movable hinged shoe of rail 13a compositions is connected.Movable hinged shoe is arranged on box platform 16, is fixed on the sill of reaction frame 1.
Horizontal guy displacement transducer 17a is fixed on reaction frame 1 by the 6th trolley platform 12f, and the other end is connected to by bracing wire
On pin joint disk 5.The vertical hollow square bar 3a of worm and gear loading device connection is further applied load, while by horizontal guy displacement sensing
Device 17a and vertical stay wire displacement sensor 17b measure corresponding shift value.
Fig. 6 is that force method experiment device for teaching horizontal reacting force acts solely on once indeterminate basic block diagram.Rigid frame knot
Structure is by two orthogonal vertical hollow square bar 3a and laterally hollow square bar 3b is formed by connecting by the first rigid joint disk 4a.It is perpendicular
Be connected to hollow square bar 3a one end by bolt with reeded first rigid joint disk 4a, the other end it is logical with by rigid joint disk 4,
Horizontally and vertically bearing sensor 11 is connected with the hold-down support that trolley platform 12 forms；Laterally hollow square bar 3b one end passes through spiral shell
Bolt is connected with reeded first rigid joint disk 4a；The other end with by pin joint disk 5, the second vertical support sensor 11d, the
The movable hinged shoe of five trolley platform 12e, hinged-support horizontal guide rail 13a composition is connected.Movable hinged shoe is arranged on box platform
On 16, box platform 16 is fixed on the sill of reaction frame 1, and horizontal guy displacement transducer 17a one end is fixed on reaction frame 1
On, the other end is connected on pin joint disk 5 by bracing wire.The screw-threaded shaft elevator 15 being fixed on box platform 16, passes through second
Horizontal seat sensor 11c, the 3rd trolley platform 12c, the horizontal seat and pin joint disk 5 of hinged-support vertical guide 13b compositions
It is connected.Horizontal loading is applied in pin joint Pan5Chu to rigid frame by screw-threaded shaft elevator 15, while by horizontal guy displacement transducer
17a and vertical stay wire displacement sensor 17b measure corresponding shift value.
Claims (3)
- A kind of 1. experiment device for teaching for intuitively changing force method, it is characterised in that including rigid-framed structure, loading device, support and Restraint device and measuring apparatus；The rigid-framed structure is by vertical hollow square bar (3a), laterally hollow square bar (3b) and the first rigid joint disk (4a) form；It is perpendicular It is fixedly connected to hollow square bar (3a) with the first rigid joint disk (4a) of one end, the other end and the fixed company of the second rigid joint disk (4b) Connect, realize the connection of rigid-framed structure and hold-down support；Laterally hollow square bar (3b) one end and the fixed company of the first rigid joint disk (4a) Connect, the other end is fixedly connected with pin joint disk (5), realizes being fixedly connected for rigid-framed structure and hinged-support；The loading device is made up of worm and gear loading device and counterweight loading device；The worm and gear loading device includes worm and gear lift (6), load bar (9), ball pivot (8) and rod member fixture (10)；Worm and gear lift (6) one end is fixedly connected with the first trolley platform (12a), and the first trolley platform (12a) is installed to On reaction frame (1) guide rail, the first trolley platform (12a) can adjust height, worm and gear lift (6) along reaction frame (1) guide rail The other end is connected with force snesor (7), and worm and gear lift (6) is further applied load by rotation hand wheel to rigid-framed structure；Power passes Sensor (7), ball pivot (8), load bar (9) and rod member fixture (10) are sequentially connected；Rod member fixture (10) realizes loading device and horizontal stroke Include pin (21), loading joint element for bar to hollow square bar (3b) or vertical hollow square bar (3a) connection, rod member fixture (10) (20) connected with rod member intermediate plate (22), loading joint element for bar (20) and rod member intermediate plate (22) by pin (21)；Vertical hollow side Bar (3a) passes perpendicularly through the groove of rod member intermediate plate (22) formation and is fixedly connected with rod member intermediate plate (22)；Loaded by worm and gear Device, realize the loading and unloading to rigid-framed structure；The counterweight loading device is made up of counterweight, pallet (18), Height Adjustable fixed pulley (19), and counterweight loading device is fixed On pin joint disk (5), by counterweight loading device, vertical load and horizontal loading are applied to rigid-framed structure；The support and restraint device are made up of the constraint support of reaction frame and rigid-framed structure；The reaction frame is made up of reaction frame (1) and base (2)；Base (2) is fixed on the sill bottom of reaction frame (1), For supporting whole device；The reaction frame (1) is vertical by two crossbeams up and down of built-in guide rail and the left and right two of built-in guide rail Post forms, and each crossbeam or column can fix worm and gear lift (6) and trolley platform；The constraint support of the rigid-framed structure includes hold-down support and fixed-hinged support；Hold-down support is sensed by first level bearing Device (11a), the first vertical bearing sensor (11b) and the second rigid joint disk (4b) composition, two bearing sensors are fixed on instead On power frame (1)；Pinboard bottom is connected with the second trolley platform (12b), pinboard side and first level bearing sensor (11a) is connected；First level bearing sensor (11a) is connected with the second rigid joint disk (4b)；Second vertical bearing sensor (11b) upper end is connected with the second rigid joint disk (4b), and lower end is connected with the second trolley platform (12b), the second trolley platform (12b) It is fixed on reaction frame (1) sill；Fixed-hinged support is sensed by the second horizontal seat sensor (11c), the second vertical bearing Device (11d), pin joint disk (5), hinged-support horizontal guide rail (13a) and hinged-support vertical guide (13b) composition；Second horizontal seat Sensor (11c) and second vertical bearing sensor (11d) one end are connected with pin joint disk (5), the second vertical bearing sensor (11d) other end is connected by the 4th trolley platform (12d) with hinged-support horizontal guide rail (13a), the second horizontal seat sensor (11c) other end is connected by the 3rd trolley platform (12c) with hinged-support upright guide rail (13b)；Hinged-support horizontal guide rail (13a) On box platform (16), hinged-support upright guide rail (13b) is arranged on pinboard side, pinboard opposite side and connector (14) connect, pinboard bottom is connected on hinged-support horizontal guide rail (13a) by the 5th trolley platform (12e)；Leading screw lifts Machine (15) is arranged on box platform (16) side, is connected by connector (14) with pinboard, applies horizontal position to rigid-framed structure Move, box platform (16) is fixed on reaction frame (1) sill；Measuring apparatus includes force snesor (7), foil gauge, horizontal guy displacement transducer (17a) and vertical bracing wire displacement sensing Device (17b)；Force snesor (7) measures the payload values that worm and gear lift (6) applies to rigid-framed structure；Strain gauge adhesion is perpendicular To hollow square bar (3a) and horizontal hollow square bar (3b) both sides diverse location, it is big that rod member internal force is calculated by the strain value measured It is small；Stay wire displacement sensor surveys horizontally and vertically displacement；Above measuring apparatus is connected by data acquisition and analysis system and computer Connect, each item data is monitored in real time by computer.
- A kind of 2. experiment device for teaching for intuitively changing force method as claimed in claim 1, it is characterised in that the rigid-framed structure For " L " shape rigid frame OR gate shape rigid frame.
- A kind of 3. experiment device for teaching for intuitively changing force method as claimed in claim 1 or 2, it is characterised in that the installation Detachably, fixed-hinged support is changed into removable hinged-support to the second horizontal seat sensor (11c) on hinged-support after removal.
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| US20220042789A1 (en) * | 2020-05-27 | 2022-02-10 | Dalian University Of Technology | Portable truss structure experiment device |
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