CN110223573A - Planar assembling truss static structural analysis experimental provision - Google Patents

Planar assembling truss static structural analysis experimental provision Download PDF

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Publication number
CN110223573A
CN110223573A CN201910634293.1A CN201910634293A CN110223573A CN 110223573 A CN110223573 A CN 110223573A CN 201910634293 A CN201910634293 A CN 201910634293A CN 110223573 A CN110223573 A CN 110223573A
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China
Prior art keywords
truss
support
ball bearing
frame
rod piece
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CN201910634293.1A
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CN110223573B (en
Inventor
李颖
偶昌宝
卓敏
杨睿
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Zhejiang University of Water Resources and Electric Power
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Zhejiang University of Water Resources and Electric Power
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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09BEDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
    • G09B23/00Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
    • G09B23/06Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics
    • G09B23/08Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for statics or dynamics
    • G09B23/10Models 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 invention proposes a kind of planar assembling truss static structural analysis experimental provisions, belong to the teaching and research field of structural mechanics.It include: frame, support, truss, dynamometer, load-carrying, fixed pulley.Experimental provision of the invention, the assembly combination of structure type, support style, loading method may be implemented, meet static determinacy and indeterminate truss structural mechanics requirement of experiment, student is allowed to understand the experimental method of concrete engineering structure problem, the ability for solving engineering problem for training student provides a teaching platform.

Description

Planar assembling truss static structural analysis experimental provision
Technical field
The present invention proposes a kind of planar assembling truss static structural analysis experimental provision, especially applies in structure Experimental provision in mechanics belongs to the teaching and research field of structural mechanics.
Background technique
Truss be it is a kind of it is hinged at both ends as numerous rod pieces made of with triangular element plane or space structure, Advantage is that its composition rod piece is primarily subjected to axle power, can make full use of the intensity of material, mitigate self weight and increase rigidity.Truss structure Static analysis is one of institution of higher learning's experiment of machanics content, but most of truss structure experiment at present is with confirmatory to demonstrate It is main, lack the teaching experiment content of incorporation engineering construction practices type.
And common truss is usually three-dimensional structure in engineering, is difficult to manually compute and measure.A kind of survey is needed in teaching Amount and calculate simple, physical concept and stress clearly teaching aid.
The invention proposes it is a kind of based on exploration exploitation assembling truss structural mechanics experimental design method and device, By student's designed, designed, assembly composite roof truss structure, test and record rod piece stress, and compared with software calculated result Analysis, deeply understands truss structure loading characteristic.
The assembly combination of structure type, support style, loading method may be implemented in the device, meets static determinacy and indeterminate purlin Frame structural mechanics requirement of experiment allows student to understand the experimental method of concrete engineering structure problem, and it is real to solve engineering for training student The ability of border problem provides a teaching platform.
Summary of the invention
It is an object of the invention to disclose a kind of planar assembling truss static structural analysis experimental provision, student is allowed Deeply understand truss structure loading characteristic.
Assembling truss static structural analysis experimental provision, including frame, support, truss, dynamometer, load-carrying, fixed pulley;
The frame includes: up-right support and truss support frame, up-right support 30mm × 30mm square steel, height For 1.4m, it is respectively 1.5m × 1.0m rectangular frame that the truss support frame, which is welded as length and width for 25mm × 25mm square steel,;
The truss is horizontally mounted in after the assembly is completed on truss support frame;
Support is set on the inside of the truss support frame quadrangle, horizontal ball bearing, horizontal ball bearing are set on support Internal diameter is that 8mm outer diameter is 16mm;
The truss is made of rod piece connection;
The rod piece is that straight-bar and horizontal ball bearing are welded to form, and a horizontal ball is respectively welded at each straight-bar both ends Bearing, two horizontal ball bearing spacing on the same straight-bar are 250mm, and spacing tolerance is 0.25mm;Straight-bar diameter 6mm; Ball bearing outer ring height is 6mm, and inner ring height is 8mm;Ball bearing internal diameter 8mm, outer diameter 16mm, inner ring thicknesses 2mm, outer ring Thickness 2mm, ball diameter 4mm between inner ring and outer ring;
The rod piece passes through ball bearing inner ring by vertical bolt and is fastened;
The redundant space generated on bolt using the rod piece that the method that ball bearing pad connects accepts height dislocation;
The truss is assembled on frame and support according to design structure form;
The dynamometry is calculated as strain stress meter;
Rod piece of slim papery sticking double faced adhesive tape of the foil gauge of the dynamometer using width no more than 9mm in truss In, for measuring the rod piece internal force of truss;
The load-carrying is connect by fixed pulley, with rope with the node of truss structure, integrally applies external force to truss structure.
Above-mentioned truss can design a variety of truss structural forms, carry out on frame and support according to experiment demand Assembling.
Above-mentioned truss can also carry out statically determinate structure and the internal force of statically indeterminate structure compares, design plane truss statically determinate structure With statically indeterminate structure form, assembled on frame and support.
Above-mentioned device experimental procedure is as follows:
1) structure type of statically determinate plane truss is designed, every bar internal force of hand computation truss carries out group on frame and support Dress;
2) truss member internal force is resurveyed in load, is compared with hand computation value;
3) truss member internal force is calculated using Structural mechanics evaluation, is compared with experiment value;
4) analytical error reason.
The beneficial effects of the present invention are:
1, stress relationship is clear, and since this structure uses two dimensional form, Force Calculation is clearly easy measurement;
2, the installation of truss integral level eliminates influence of rod piece weight to stress itself;
3, the bonding method of foil gauge only obtains the strain and stress of horizontal direction.
A kind of assembling truss static structural analysis experimental method and device based on exploration exploitation proposed by the present invention, The assembly combination that structure type, support style, loading method may be implemented, meets static determinacy and the experiment of indeterminate truss structural mechanics It is that the ability of training student solution engineering problem mentions it is required that student is allowed to understand the experimental method of concrete engineering structure problem A teaching platform is supplied.
Detailed description of the invention
Fig. 1 is apparatus of the present invention overall schematic;
Fig. 2 is rod piece bearing connection schematic diagram of the present invention;
Fig. 3 is that the present invention is bolted bearing schematic diagram;
Fig. 4 is truss structural of the present invention (1) schematic diagram;
Fig. 5 is truss structural of the present invention (2) schematic diagram;
Fig. 6 is truss structural of the present invention (3) schematic diagram;
Fig. 7 is truss structural of the present invention (4) schematic diagram;
Fig. 8 is plane girder statically determinate structure schematic diagram of the present invention;
Fig. 9 is plane girder statically indeterminate structure schematic diagram of the present invention.
Specific embodiment
A specific embodiment of the invention is described with reference to the drawings.
As shown in Figure 1, assembling truss static structural analysis experimental provision, including frame 1, support 2, truss 3, dynamometer 4, load-carrying 5, fixed pulley 6;
The frame 1 includes: up-right support 11 and truss support frame 12, and the up-right support 11 is 30mm × 30mm Square steel is highly 1.4m, and it is respectively 1.5m × 1.0m that the truss support frame 12, which is welded as length and width for 25mm × 25mm square steel, Rectangular frame;
The truss 3 is horizontally mounted in after the assembly is completed on truss support frame 12;
Support 2 is arranged in described 12 4 jiaos of insides of truss support frame, and horizontal ball bearing, horizontal ball is arranged on support 2 Bearing bore diameter is 8mm, outer diameter 16mm;
The truss 3 is made of rod piece connection;
As shown in Fig. 2, the rod piece is that straight-bar 31 and horizontal ball bearing 32 are welded to form, each 31 both ends of straight-bar are each A horizontal ball bearing 32 is welded, two horizontal 32 spacing of ball bearing on the same straight-bar 31 are 250mm, spacing tolerance For 0.25mm;31 diameter 6mm of straight-bar;32 outer ring of ball bearing, 322 height is 6mm, and 321 height of inner ring is 8mm;Ball bearing 32 Internal diameter 8mm, outer diameter 16mm, 321 thickness 2mm of inner ring, 322 thickness 2mm of outer ring, ball diameter between inner ring 321 and outer ring 322 4mm;
3 rod piece of truss passes through ball bearing inner ring 321 by vertical bolt 7 and is fastened;
The redundant space generated on bolt 7 using the rod piece that the method that ball bearing pad connects accepts height dislocation;
The truss 3 is assembled on frame 1 and support 2 according to design structure form;
The dynamometer 4 is strain chip stress meter;
Rod piece of slim papery sticking double faced adhesive tape of the foil gauge of the dynamometer 4 using width no more than 9mm in truss 3 In, for measuring the rod piece internal force of truss 3;
The load-carrying 5 is connect by fixed pulley 6, with rope with the node of truss structure, is integrally applied to truss structure outer Power.
Above-mentioned truss 3 can design a variety of truss structural forms according to experiment demand, enterprising in frame 1 and support 2 Row assembling, as shown in Figure 2-5.
Above-mentioned truss 3 can also carry out statically determinate structure and the internal force of statically indeterminate structure compares, design plane truss static determinacy knot Structure and statically indeterminate structure form are assembled, as shown in Figure 6,7 on frame 1 and support 2.
Above-mentioned device experimental procedure is as follows:
1) structure type of statically determinate plane truss 3 is designed, the every bar internal force of hand computation truss 3 is enterprising in frame 1 and support 2 Row assembling;
2) load weighs 5 survey 3 rod piece internal force of truss, is compared with hand computation value;
3) 3 rod piece internal force of truss is calculated using Structural mechanics evaluation, is compared with experiment value;
4) analytical error reason.

Claims (3)

1. planar assembling truss static structural analysis experimental provision, it is characterised in that: including frame (1), support (2), Truss (3), dynamometer (4), load-carrying (5), fixed pulley (6);The frame (1) includes: up-right support (11) and truss support Frame (12), the up-right support (11) 30mm × 30mm square steel, is highly 1.4m, and the truss support frame (12) is 25mm It is respectively 1.5m × 1.0m rectangular frame that × 25mm square steel, which is welded as length and width,;The truss (3) is horizontal after the assembly is completed to be placed On truss support frame (12);Support (2) are set on the inside of described truss support frame (12) quadrangle, are arranged on support (2) horizontal Ball bearing, horizontal ball bearing internal diameter are 8mm, outer diameter 16mm.
2. planar assembling truss static structural analysis experimental provision according to claim 1, it is characterised in that: on The truss (3) stated is made of rod piece connection;The rod piece is that straight-bar (31) and horizontal ball bearing (32) are welded to form, each Respectively weld a horizontal ball bearing (32), two horizontal ball bearings (32) on the same straight-bar (31) in straight-bar (31) both ends Spacing is 250mm, and spacing tolerance is 0.25mm;Straight-bar (31) diameter 6mm;Ball bearing (32) outer ring (322) is highly 6mm, Inner ring (321) is highly 8mm;Ball bearing (32) internal diameter 8mm, outer diameter 16mm, inner ring (321) thickness 2mm, outer ring (322) are thick Spend 2mm, ball diameter 4mm between inner ring (321) and outer ring (322).
3. planar assembling truss static structural analysis experimental provision according to claim 1, it is characterised in that: on Truss (3) rod piece stated passes through ball bearing inner ring (321) by vertical bolt (7) and is fastened;It is connect using ball bearing pad Method accept the redundant space that generates on bolt (7) of rod piece of height dislocation;Above-mentioned truss (3) is according to design structure shape Formula is assembled on frame (1) and support (2);Above-mentioned dynamometer (4) is strain stress meter;Dynamometer (4) are answered Become slim papery sticking double faced adhesive tape of the piece using width no more than 9mm in the rod piece of truss (3), for measuring truss (3) Rod piece internal force;Above-mentioned load-carrying (5) is connect with rope with the node of truss structure by fixed pulley (6), is integrally applied to truss structure Add external force.
CN201910634293.1A 2019-07-15 2019-07-15 Plane two-dimensional assembled truss structure static analysis experimental device Active CN110223573B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111932998A (en) * 2020-08-11 2020-11-13 南京航空航天大学 Plane truss comprehensive experiment device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203982627U (en) * 2014-05-22 2014-12-03 大连理工大学 Multifunctional girder structure experimental provision
JP2015086654A (en) * 2013-11-01 2015-05-07 株式会社Light′S Truss beam frame for solar panel and assembling method using the same
CN106327966A (en) * 2016-09-23 2017-01-11 大连理工大学 Assembly beam structure experiment model and method
CN108806422A (en) * 2018-08-14 2018-11-13 西安交通大学 A kind of statics synthesis experiment platform and experimental method
CN210271412U (en) * 2019-07-15 2020-04-07 浙江水利水电学院 Plane two-dimensional assembled truss structure static analysis experimental device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015086654A (en) * 2013-11-01 2015-05-07 株式会社Light′S Truss beam frame for solar panel and assembling method using the same
CN203982627U (en) * 2014-05-22 2014-12-03 大连理工大学 Multifunctional girder structure experimental provision
CN106327966A (en) * 2016-09-23 2017-01-11 大连理工大学 Assembly beam structure experiment model and method
CN108806422A (en) * 2018-08-14 2018-11-13 西安交通大学 A kind of statics synthesis experiment platform and experimental method
CN210271412U (en) * 2019-07-15 2020-04-07 浙江水利水电学院 Plane two-dimensional assembled truss structure static analysis experimental device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111932998A (en) * 2020-08-11 2020-11-13 南京航空航天大学 Plane truss comprehensive experiment device

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