CN111583764B - Modular structure mechanics experiment platform extension formula rod system structure - Google Patents
Modular structure mechanics experiment platform extension formula rod system structure Download PDFInfo
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Abstract
The invention provides an expansion type rod system structure of a modular structural mechanics experiment platform, which comprises variable cross-section standard rod pieces, a node connecting part and a reinforcing cover plate, wherein the variable cross-section standard rod pieces are connected through the node connecting part to form an experiment structure, so that hinged or rigid connection between the variable cross-section standard rod pieces or between the variable cross-section standard rod pieces and a support can be realized; the end part of the variable cross-section standard rod piece is narrowed, so that the rod end forms a variable cross section, and the continuity of the rigidity of the cross section is ensured when the variable cross-section standard rod piece is connected with the node connecting component; the reinforcing cover plate is connected with the node connecting part and used for improving the rigidity of the node. The design of the node connecting part can realize rigid connection and articulation between the variable cross-section standard rod piece and the node, and meanwhile, according to different connecting modes of two ends of the variable cross-section standard rod piece, the calculated length of the variable cross-section standard rod piece can be determined, so that theoretical calculation is more accurately performed, and the theoretical analysis of teaching experiments is facilitated.
Description
Technical Field
The invention relates to the field of teaching and scientific research experimental devices of civil engineering major, in particular to an expanding type rod system structure of a modular structure mechanics experimental platform.
Background
The structural mechanics as the core course of civil engineering works plays a role in starting and ending in the whole professional knowledge system. Through the development of many years, the knowledge of structural mechanics has formed a complete theoretical system. With the increase of the national importance of advanced education, a few colleges and universities try to introduce practice courses into education of structural mechanics courses, which is mainly realized by developing experimental teaching. However, these experimental teaching are generally based on two forms of experimental equipment: firstly, based on mechanics of materials experimental facilities, secondly, built structural mechanics experiment teaching platform. Under the condition of adopting a material mechanics experimental device, an experimental teaching project is generally limited to the implementation of a single rod piece. However, the research category of structural mechanics encompasses bar-system structures, so teaching based solely on experimental equipment of material mechanics is clearly unsatisfactory and unsuitable.
Some colleges and universities try to develop a structural mechanics experiment teaching platform, but the currently applied experiment platform generally has the defects of single structural object, limited experiment function, poor operability and the like. Through search, Chinese patents with publication numbers CN104751704B, CN104332086B, CN101303813A and 103761910B respectively propose structural mechanics experimental devices, but do not relate to modular design and assembly of experimental structures, and the rod system structure has no expansibility. Chinese patent with publication number CN104568601B proposes a structural mechanics experimental apparatus for the rod system structure, and its experimental structure can realize the modularization and assemble, and the rod system structure has certain expansibility, however, this patent can't realize multi-span multi-layer rod system structure, and its member connecting piece is the unilateral setting moreover, and connection rigidity should not obtain the assurance, has also influenced the symmetry of cross-section.
Therefore, design a rod system structure that can satisfy structural mechanics teaching needs comprehensively, various rod system structures in the realization structural mechanics, including multilayer rod system structure, it is especially important to satisfying structural mechanics experiment teaching requirement and improving the teaching effect.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an expanding type rod system structure of a modular structure mechanical experiment platform.
The invention provides an expanding type rod system structure of a modular structure mechanics experiment platform, which comprises: the device comprises a variable cross-section standard rod piece, a node connecting part and a reinforcing cover plate;
the variable cross-section standard rods are connected through the node connecting parts to form an experimental structure, and hinged or rigid connection between the variable cross-section standard rods or between the variable cross-section standard rods and the support can be realized;
the end part of the variable cross-section standard rod piece is narrowed, so that the rod end forms a variable cross section, and the continuity of the rigidity of the cross section is ensured when the variable cross-section standard rod piece is connected with the node connecting part;
the reinforcing cover plate is connected with the node connecting part and used for improving the rigidity of the node.
Preferably, a first bolt hole and a second bolt hole are respectively formed in two ends of the variable cross-section standard rod piece from inside to outside along the length direction;
a plurality of third bolt holes are formed in the node connecting part, and the aperture of each third bolt hole is matched with the first bolt hole and the second bolt hole;
the node connecting part is provided with a through hole, the direction of the through hole is vertical to the opening direction of the first bolt hole and the second bolt hole, and the through hole is used for connecting the reinforcing cover plate;
the two node connecting parts clamp one end of the variable cross-section standard rod piece to realize the connection of the end part of the variable cross-section standard rod piece and the node connecting part, and a connecting point which can freely rotate, namely a hinge node, is formed by inserting the first connecting part into the third bolt hole and the first bolt hole or the second bolt hole of the variable cross-section standard rod piece, so that the hinge connection between the end part of the variable cross-section standard rod piece and the node connecting part is realized; and the rigid connection between the end part of the variable cross-section standard rod piece and the node connecting part is realized by a completely fixed connection mode, namely a rigid connection node, formed by screwing two threaded second connecting parts into the third bolt hole and the first bolt hole and the second bolt hole of the variable cross-section standard rod piece respectively.
Preferably, the section change part of the variable-section standard rod piece is provided with an arc structure, so that the end part of the variable-section standard rod piece can freely rotate within an experimentally allowable displacement range during hinging.
Preferably, the node connection members include a cross-shaped node connection member, a T-shaped node connection member, and a straight-shaped node connection member; wherein,
the cross-shaped node connecting part is used for connecting nodes of the variable cross-section standard rod piece in the upper direction, the lower direction, the left direction and the right direction;
the T-shaped node connecting component is used for connecting nodes which are connected with the variable cross-section standard rod piece in two mutually vertical directions;
the straight node connecting part is used for connecting two nodes connected with the variable cross-section standard rod piece in one direction.
Preferably, the linear sides of the cross-shaped node connecting part in four directions are consistent in size;
and at least three third bolt holes which are uniformly distributed are arranged on the straight line edge in each direction and are used for connecting the variable-section standard rod piece and/or the support.
Preferably, the sizes of the horizontal side and the vertical side of the T-shaped node connecting component in two directions are consistent;
and at least three third bolt holes which are uniformly distributed are formed in the horizontal side and the vertical side and are used for connecting the variable-section standard rod piece and/or the support.
Preferably, at least three third bolt holes which are uniformly distributed are respectively arranged at two ends of the straight node connecting component and are used for connecting the variable cross-section standard rod piece and/or the support.
Preferably, the modular structural mechanics experiment platform extension type bar system structure has one or more of the following options:
the cross section of the variable cross-section standard rod piece is rectangular, so that the load application and the installation and the accurate work of a physical quantity measuring device in a structural mechanics experiment are facilitated;
scales are arranged on the variable cross-section standard rod piece and used as measuring points in the experiment loading process for determining the loading position and the stress distribution on the cross section; and the strain gauge is adhered to the measuring site and used for measuring the stress and the strain of the section.
Preferably, the reinforcing cover plate comprises a right-angle reinforcing cover plate and a straight-line reinforcing cover plate; and a fourth bolt hole is formed in the reinforcing cover plate and used for connecting the node connecting part.
Preferably, the modular structural mechanics experiment platform extension type bar system structure comprises one or more of the following options:
the length of the variable cross-section standard rod piece can be set to be different lengths according to the modulus, and the variable cross-section standard rod piece is used for splicing different experimental models;
-the size of the nodal connection member can be determined according to the variation in size of the variable section modular rods;
according to different connection modes of two ends of the variable cross-section standard rod piece, the calculated length of the variable cross-section standard rod piece can be determined for theoretical calculation; when the two ends of the variable cross-section standard rod piece are rigidly connected with the node connecting part, the calculated length of the variable cross-section standard rod piece is L1(ii) a When two ends of the variable cross-section standard rod piece are hinged with the node connecting component, the calculated length of the variable cross-section standard rod piece is L2(ii) a When one end of the variable cross-section standard rod piece is rigidly connected with the node connecting part and the other end of the variable cross-section standard rod piece is hinged with the node connecting part, the calculated length of the variable cross-section standard rod piece is L3The length L of the standard rod piece with the variable cross section is calculated1>L3>L2。
Compared with the prior art, the invention has at least one of the following beneficial effects:
1) at present, a structural mechanics experiment system does not form unified experiment contents and an experiment mode, material mechanics experiments such as material stretching and compression and the like are generally developed in colleges and universities, but structural mechanics is stronger in theoretical property and more complex in mechanical model compared with material mechanics, and a rod piece in the structural mechanics experiment of the structural mechanics experiment system is a main part forming a structure of the structural mechanics experiment system and is also a main research object. The size of the rod piece is considered to be coordinated with the size of the whole experimental device system, various supports and node connecting systems (interfaces) in the design. The variable cross-section standard rod piece with the rectangular cross-section of the main body part is adopted, so that the analysis is easy, the load application and the installation and the accurate work of the physical quantity measuring device are facilitated, and the appropriate strain and displacement can be generated under the appropriate load through calculation. Meanwhile, the rigidity continuity of the rod piece is considered, and the change part of the narrowed section at the end part of the rod piece is designed into an arc shape so as to be connected with the node connecting part and rotate freely when being hinged.
2) The conventional design has the defects of unclear calculated length of a rod piece, difficulty in applying bending moment of a node and the like in the aspects of fixing the node device, the node and a support. On the basis, rigid connection and hinging of the rod piece and the node can be perfectly realized by the node connection design, meanwhile, the calculated length of the rod piece can be determined according to different connection modes at two ends of the rod piece, theoretical calculation is accurately carried out, and theoretical analysis of teaching experiments is facilitated.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic overall view of a modular structural mechanics experiment platform expansion type bar system structure according to a preferred embodiment of the present invention;
FIG. 2a is a front view of a variable cross-section modular rod member in accordance with a preferred embodiment of the present invention;
FIG. 2b is a side view of a variable cross-section modular rod member in accordance with a preferred embodiment of the present invention;
FIG. 2c is a top view of a variable cross-section modular rod assembly in accordance with a preferred embodiment of the present invention;
FIG. 3a is a front view of a cross-shaped node connecting member in accordance with a preferred embodiment of the present invention;
FIG. 3b is a side view of a cross-shaped node connecting member in accordance with a preferred embodiment of the present invention;
FIG. 3c is a top view of a cross-shaped node connecting member according to a preferred embodiment of the present invention;
FIG. 4a is a front view of a T-shaped node connecting member in accordance with a preferred embodiment of the present invention;
FIG. 4b is a side view of a T-shaped node connecting member in accordance with a preferred embodiment of the present invention;
FIG. 4c is a top view of a T-shaped node connecting member in accordance with a preferred embodiment of the present invention;
FIG. 5a is a front view of a rectilinear node-connecting member in accordance with a preferred embodiment of the present invention;
FIG. 5b is a side view of a rectilinear node-connecting member in accordance with a preferred embodiment of the present invention;
FIG. 5c is a top view of a rectilinear node-connecting member in accordance with a preferred embodiment of the present invention;
FIG. 6a is a front view of a right angle reinforcing cover plate in accordance with a preferred embodiment of the present invention;
FIG. 6b is a side view of a right angle reinforcing cover plate in accordance with a preferred embodiment of the present invention;
FIG. 6c is a top view of a right angle reinforcing cover plate in accordance with a preferred embodiment of the present invention;
FIG. 7a is a front view of a linear direction reinforcement cover in accordance with a preferred embodiment of the present invention;
FIG. 7b is a side view of a linear direction reinforcement cover in accordance with a preferred embodiment of the present invention;
FIG. 7c is a top view of a linear direction reinforcement cover in accordance with a preferred embodiment of the present invention;
FIG. 8 is an experimental schematic of a continuous beam in a preferred embodiment of the present invention;
FIG. 9 is a schematic illustration of a rigid frame test according to a preferred embodiment of the present invention;
the scores in the figure are indicated as: the cross-section-variable standard rod piece comprises a variable cross-section standard rod piece 1, an arc 2, scales 3, a cross-shaped node connecting part 4, a T-shaped node connecting part 5, a straight-shaped node connecting part 6, a right-angle direction reinforcing cover plate 7, a straight-line direction reinforcing cover plate 8, a first bolt hole 9, a second bolt hole 10, a third bolt hole 11, a fourth bolt hole 12 and a through hole 13.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
Referring to fig. 1, a general schematic diagram of an expanding rod system structure of a modular structural mechanics experiment platform according to an embodiment of the present invention is shown, where the diagram includes a variable cross-section standard rod 1, a node connecting component 2, and a reinforcing cover plate; the node connecting part 2 is used for connecting the variable cross-section standard rod pieces 1 into an experimental structure, and can realize hinged or rigid connection between the variable cross-section standard rod pieces 1 or between the variable cross-section standard rod pieces 1 and a support; the node connecting members 2 may include a cross-type node connecting member 4, a T-type node connecting member 5, and a straight-type node connecting member 6. The reinforcing cover plate is connected with the node connecting part and used for improving the rigidity of the node.
Referring to fig. 2a, 2b and 2c, the variable cross-section modular bar 1 is a basic module of experimental construction, made of metal. The cross section of the variable cross-section standard rod piece 1 is rectangular, so that the load application and the installation and the accurate work of a physical quantity measuring device in a structural mechanics experiment are facilitated. The end part of the variable cross-section standard rod piece 1 is narrowed and designed to be connected with the node connecting part conveniently, and the cross section of the end part is narrower than that of the middle part so as to ensure the continuity of the rigidity of the cross section when the variable cross-section standard rod piece is connected with the node. The upper surface and the lower surface of the variable cross-section standard rod piece 1 are provided with equidistant scales 3 which can be used as measuring points in the experiment loading process, and the stress and the strain of the cross section are measured and determined after a strain gauge is pasted.
As a preferred embodiment, the section change of the variable-section standard rod piece 1 is provided with an arc-shaped 2 structure, so that the rod end can freely rotate within an experimentally allowed displacement range when the rod is hinged.
In other preferred embodiments, the tapered portions at both ends of the rod end of the standard rod 1 are respectively provided with a first bolt hole 9 without threads and a second bolt hole 10 without threads from inside to outside along the length direction. A number of third non-threaded bolt holes 11 are provided in the node connecting part. The third bolt hole 11 matches the hole diameters of the first bolt hole 9 and the second bolt hole 10.
In the concrete implementation, two node connecting parts clamp one end of the variable cross-section standard rod piece 1, and the end part of the variable cross-section standard rod piece 1 is connected with the node connecting part through a bolt. The end part of the variable cross-section standard rod piece 1 can be connected with the node connecting part through a single bolt or two bolts are connected with the node connecting part, so that the end part of the variable cross-section standard rod piece 1 is hinged or rigidly connected with the node connecting part.
One end of the variable cross-section standard rod piece 1 is clamped by two node connecting parts, the variable cross-section standard rod piece 1 and the node connecting parts form a freely rotatable connecting point through the first connecting part inserted into the third bolt hole 11 of the node connecting part and the first bolt hole 9 or the second bolt hole 10 of the variable cross-section standard rod piece 1, and the end part of the variable cross-section standard rod piece 1 is hinged with the node connecting parts, namely a hinged node is formed on the node connecting parts. Preferably, the first connecting part may employ a round bolt.
One end of the variable cross-section standard rod piece 1 is clamped by two node connecting parts, the two threaded second connecting parts are screwed into the third bolt hole 11 of the node connecting part and the first bolt hole 9 and the second bolt hole 10 of the variable cross-section standard rod piece 1, the variable cross-section standard rod piece 1 and the node connecting parts form a completely fixed connecting mode, and rigid connection between the end part of the variable cross-section standard rod piece 1 and the node connecting parts is achieved, namely a rigid connection node is formed on the node connecting parts. Preferably, the second connecting member may employ a threaded bolt.
In other preferred embodiments, the rod length of the variable cross-section standard rod 1 can be set according to the modulus, and different lengths can be set for splicing different experimental models. The node connecting member size may be varied according to standard rod size.
Taking the L-long variable cross-section standard rod 1 as an example, the circle centers of the two first bolt holes 9 on the inner side have a certain distance, according to the rod connection condition, the length of the node connecting part needs to be considered when the two ends are just connected, and the calculated length of the variable cross-section standard rod 1 is L1; the calculated length of the hinge is L2 when the two ends are hinged; the length was calculated as L3 when one end was rigidly connected and the other was hinged. And L1> L3> L2.
In other partially preferred embodiments, the node connecting members include a cross node connecting member 4, a T-shaped node connecting member 5, and a straight node connecting member 6; the cross-shaped node part 4 is used for connecting nodes of the variable cross-section standard rod piece 1 connected with the cross-shaped node part in the upper, lower, left and right directions; the T-shaped node part 5 is used for connecting nodes of connecting rods in two mutually vertical directions except the previous working condition; a straight nodal connection 6 is used for nodal connection in one direction with two connected rods.
As shown in fig. 3a, 3b, and 3c, the cross-shaped node connecting members 4 have uniform linear sides in each direction. Three third bolt holes 11 which are uniformly distributed are formed in the straight line edge in each direction, wherein the four third bolt holes 11 which are positioned in the center of the cross-shaped node connecting part 4 are used for connecting a support; the remaining third bolt hole 11 on the straight side is used for connecting the variable cross-section modular bar 1.
As shown in fig. 4a, 4b and 4c, the T-shaped node connecting members 5 have the same size of horizontal and vertical sides in both directions; three third bolt holes 11 are arranged at equal intervals on the horizontal side and the vertical side, wherein the three third bolt holes 11 positioned at the center of the T-shaped node connecting component 5 are used for connecting a support, and the remaining third bolt holes 11 respectively positioned on the horizontal side and the vertical side are used for connecting the variable cross-section standard rod piece 1.
As shown in fig. 5a, 5b and 5c, three third bolt holes 11 are respectively arranged at two ends of the straight node connecting part 6 at equal intervals, wherein two third bolt holes 11 located at the center of the straight node connecting part 6 are used for connecting the support, and the remaining third bolt holes 11 are used for connecting the variable cross-section standard rod member 1.
In other preferred embodiments, a through hole 13 (light circular hole) parallel to the body of the node connecting component is formed in a direction perpendicular to the main opening direction of the node connecting component, and is used for connecting a reinforcing cover plate so as to improve the rigidity of the node. As shown in fig. 3a, 3b and 3c, one through hole 13 is provided on each of the four-directional straight sides of the cross-shaped node connecting member 4. As shown in fig. 4a, 4b and 4c, a through hole 13 is provided on the horizontal and vertical sides of the T-shaped node connecting member 5. Referring to fig. 5a, three through holes 13 are provided in the in-line node connecting member 6.
In other partially preferred embodiments, the reinforcement cover includes a right-angle direction reinforcement cover 7 and a straight direction reinforcement cover 8. As shown in fig. 6a, 6b and 6c, two smooth circular fourth bolt holes 12 perpendicular to the body are opened in the width direction of the reinforcing cover plate. The fourth bolt hole 12 of the reinforcing cover plate is connected to the node connecting member in a direction perpendicular to the plane of the node connecting member. The plate body thickness of this reinforcement apron is less, and the centre-to-centre spacing of two fourth bolt holes 12 is unanimous with 1 cross-section width of variable cross section standard member, can prevent through light circle fourth bolt hole 12 connection that two node connecting parts can not keep parallel under the bolted connection effect, take place out-of-plane deformation or even destroy.
During specific implementation, after the two cross-shaped node connecting parts clamp the end parts of the variable cross-section standard rod pieces 1, right-angle reinforcing cover plates shown in fig. 6a are placed on the side faces of the right-angle positions of the cross-shaped node connecting parts and are respectively connected with the two cross-shaped node connecting parts through bolts, so that the connecting stability is improved. After the end parts of the standard rod pieces are clamped by the two linear joint connecting parts, linear reinforcing cover plates as shown in figure 7a are arranged on the upper side surface and the lower side surface of each linear joint connecting part and are respectively connected with the two cross joint connecting parts through bolts, so that the connecting stability is improved.
Referring to fig. 5, the schematic diagram of the continuous beam experiment assembled by the experimental structural system is shown, the continuous beam comprises two variable cross-section standard rod pieces, two straight-line-shaped node connecting parts 6 and a T-shaped node part 5, and all the nodes are hinged.
Referring to fig. 6, the schematic diagram of a steel frame experiment assembled by an experimental structural system is shown, the steel frame includes 10 variable cross-section standard rod pieces, 8T-shaped node parts 5 and a cross-shaped node connecting part 4, the 10 variable cross-section standard rod pieces are connected into an integrated structure through the node connecting part, wherein the three connecting nodes of the variable cross-section standard rod pieces except the bottom and the support are hinged, and the connecting nodes between the other variable cross-section standard rod pieces are all rigid-connected.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (9)
1. A modular structure mechanics experiment platform extension type rod system structure comprises: the standard rod pieces are connected through the node connecting parts to form an experimental structure, and hinged or rigid connection between the standard rod pieces or between the standard rod pieces and the support can be realized; the method is characterized in that: further comprising:
reinforcing the cover plate;
the standard rod piece adopts a variable cross-section standard rod piece;
the end part of the variable cross-section standard rod piece is narrowed, so that the rod end forms a variable cross section, and the continuity of the rigidity of the cross section is ensured when the variable cross-section standard rod piece is connected with the node connecting part;
the reinforcing cover plate is connected with the node connecting part and used for improving the rigidity of the node;
a first bolt hole and a second bolt hole are respectively formed in two ends of the variable cross-section standard rod piece from inside to outside along the length direction;
a plurality of third bolt holes are formed in the node connecting part, and the aperture of each third bolt hole is matched with the first bolt hole and the second bolt hole;
the node connecting part is provided with a through hole, the direction of the through hole is vertical to the opening direction of the first bolt hole and the second bolt hole, and the through hole is used for connecting the reinforcing cover plate;
the two node connecting parts clamp one end of the variable cross-section standard rod piece to realize the connection of the end part of the variable cross-section standard rod piece and the node connecting part, and a connecting point which can freely rotate, namely a hinge node, is formed by inserting the first connecting part into the third bolt hole and the first bolt hole or the second bolt hole of the variable cross-section standard rod piece, so that the hinge connection between the end part of the variable cross-section standard rod piece and the node connecting part is realized; and the rigid connection between the end part of the variable cross-section standard rod piece and the node connecting part is realized by a completely fixed connection mode, namely a rigid connection node, formed by screwing two threaded second connecting parts into the third bolt hole and the first bolt hole and the second bolt hole of the variable cross-section standard rod piece respectively.
2. The modular structure mechanics experiment platform expansion type rod system structure of claim 1, wherein the section change of the variable section standard rod piece is provided with an arc structure, so that the end part of the variable section standard rod piece can freely rotate within the displacement range allowed by the experiment when hinged.
3. The modular structural mechanics experiment platform extension type rod system structure of claim 1, wherein: the node connecting parts comprise cross node connecting parts, T-shaped node connecting parts and straight-shaped node connecting parts; wherein,
the cross-shaped node connecting part is used for connecting nodes of the variable cross-section standard rod piece in the upper direction, the lower direction, the left direction and the right direction;
the T-shaped node connecting component is used for connecting nodes which are connected with the variable cross-section standard rod piece in two mutually vertical directions;
the straight node connecting part is used for connecting two nodes connected with the variable cross-section standard rod piece in one direction.
4. The modular structural mechanics experiment platform extension type rod system structure of claim 3, wherein: the sizes of the straight line edges in four directions of the cross-shaped node connecting part are consistent;
and at least three third bolt holes which are uniformly distributed are arranged on the straight line edge in each direction and are used for connecting the variable-section standard rod piece and/or the support.
5. The modular structural mechanics experiment platform extension type rod system structure of claim 3, wherein: the sizes of the horizontal edges and the vertical edges of the T-shaped node connecting component in two directions are consistent;
and at least three third bolt holes which are uniformly distributed are formed in the horizontal side and the vertical side and are used for connecting the variable-section standard rod piece and/or the support.
6. The modular structural mechanics experiment platform extension type rod system structure of claim 3, wherein: and two ends of the straight-shaped node connecting component are respectively provided with at least three third bolt holes which are uniformly distributed and used for connecting the variable-section standard rod piece and/or the support.
7. The modular structural mechanical experiment platform extension type rod system structure of any one of claims 1 to 6, wherein: has one or more of the following technical characteristics,
the cross section of the variable cross-section standard rod piece is rectangular, so that the load application and the installation and the accurate work of a physical quantity measuring device in a structural mechanics experiment are facilitated;
scales are arranged on the variable cross-section standard rod piece and used as measuring points in the experiment loading process for determining the loading position and the stress distribution on the cross section;
-a strain gauge is attached to the measuring site for measuring the stress and strain of the cross section.
8. The modular structural mechanical experiment platform extension type rod system structure of any one of claims 1 to 6, wherein: the reinforced cover plate comprises a right-angle reinforced cover plate and a linear reinforced cover plate; and a fourth bolt hole is formed in the reinforcing cover plate and used for connecting the node connecting part.
9. The modular structural mechanical experiment platform extension type rod system structure of any one of claims 2 to 6, wherein: also includes one or more of the following options:
the length of the variable cross-section standard rod piece can be set to be different lengths according to the modulus, and the variable cross-section standard rod piece is used for splicing different experimental models;
-the size of the nodal connection member can be determined according to the variation in size of the variable section modular rods;
according to different connection modes of two ends of the variable cross-section standard rod piece, the calculated length of the variable cross-section standard rod piece can be determined for theoretical calculation; when the two ends of the variable cross-section standard rod piece are rigidly connected with the node connecting component, the calculated length of the variable cross-section standard rod piece is L1; when the two ends of the variable cross-section standard rod piece are hinged with the node connecting component, the calculated length of the variable cross-section standard rod piece is L2; when one end of the variable cross-section standard rod piece is rigidly connected with the node connecting component and the other end of the variable cross-section standard rod piece is hinged with the node connecting component, the calculated length of the variable cross-section standard rod piece is L3, and the calculated length of the variable cross-section standard rod piece is L1> L3> L2.
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| DE2521468A1 (en) * | 1975-05-14 | 1976-11-25 | Theo Dr Ing Huettner | Bar bending demonstration device - has bars mounted on metal frame fastened to transparent plastic plate |
| CN1687979A (en) * | 2005-03-28 | 2005-10-26 | 哈尔滨工业大学 | Cantilever part with mounting plate for mechanical experiment |
| CN104568601A (en) * | 2015-01-22 | 2015-04-29 | 安徽工程大学 | Spatial structure mechanics experiment device |
| CN207938233U (en) * | 2017-10-30 | 2018-10-02 | 九江学院 | A kind of Solid Mechanics pressure test experimental provision |
| CN110288881A (en) * | 2019-05-28 | 2019-09-27 | 上海交通大学 | A kind of modular construction mechanics experiment platform system |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2521468A1 (en) * | 1975-05-14 | 1976-11-25 | Theo Dr Ing Huettner | Bar bending demonstration device - has bars mounted on metal frame fastened to transparent plastic plate |
| CN1687979A (en) * | 2005-03-28 | 2005-10-26 | 哈尔滨工业大学 | Cantilever part with mounting plate for mechanical experiment |
| CN104568601A (en) * | 2015-01-22 | 2015-04-29 | 安徽工程大学 | Spatial structure mechanics experiment device |
| CN207938233U (en) * | 2017-10-30 | 2018-10-02 | 九江学院 | A kind of Solid Mechanics pressure test experimental provision |
| CN110288881A (en) * | 2019-05-28 | 2019-09-27 | 上海交通大学 | A kind of modular construction mechanics experiment platform system |
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