CN106353054B - A kind of multispan beam structural experiment model and experimental method - Google Patents
A kind of multispan beam structural experiment model and experimental method Download PDFInfo
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- 238000002474 experimental method Methods 0.000 title claims abstract description 79
- 238000010276 construction Methods 0.000 claims abstract description 70
- 238000006243 chemical reaction Methods 0.000 claims abstract description 64
- 239000011888 foil Substances 0.000 claims abstract description 36
- 238000000034 method Methods 0.000 claims abstract description 35
- 238000005259 measurement Methods 0.000 claims abstract description 3
- 230000003068 static effect Effects 0.000 claims description 67
- 230000000694 effects Effects 0.000 claims description 22
- 238000006073 displacement reaction Methods 0.000 claims description 19
- 238000005452 bending Methods 0.000 claims description 16
- 238000010586 diagram Methods 0.000 claims description 12
- 238000009434 installation Methods 0.000 claims description 9
- 230000036316 preload Effects 0.000 claims description 6
- 238000004458 analytical method Methods 0.000 claims description 2
- 230000000452 restraining effect Effects 0.000 claims description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0041—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress
- G01M5/005—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress by means of external apparatus, e.g. test benches or portable test systems
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Abstract
A kind of multispan beam structural experiment model of present invention offer and experimental method, including multispan girder construction, electrical servo loading device, restricted joint angle and loading device, bearing and restraint device and measuring apparatus；The multispan girder construction is divided into two kinds of basic structures of statically determinate structure and redundant structure, and two kinds of basic structures are formed by connecting by rod piece and pin；There are two types of structure, two kinds of structures to work together with control system for the electrical servo loading device, there is Bit andits control load and load control load two ways；The restricted joint angle and loading device includes screw-threaded shaft elevator, torque sensor, servo-actuated disk and connector；The bearing and restraint device includes the constraint bearing of reaction frame and multispan girder construction；The measuring apparatus includes force snesor, foil gauge, rotary angle transmitter and dial gauge.The apparatus structure is simple, it is repeatable utilize, measurement result it is accurate, can realize that structural mechanics influences the experiment of the contents of courses such as line and moment distribution method.
Description
Technical field
The invention belongs to the teaching practice fields of civil engineering experimental configuration mechanics, are related to static determinacy, indeterminate multispan
The structural mechanics experiment of girder construction experimental provision and application device progress.
Technical background
Structural mechanics is institution of higher learning's civil engineering mandatory subject, the rod pieces knot such as main Yi Liang, arch, truss, rigid frame
Structure is main study subject, studies external force according to mechanics principle and other extraneous factors act on internal force and the deformation of lower structure, knot
Intensity, rigidity, stability and the dynamic response of structure and the component law and stress performance of structure.
The teaching method of institution of higher learning's structural mechanics is mainly theory teaching at present, lacks the experiment to related mechanics principle
Verification causes part classmate to understand correlation theory not deep enough, or even generates query to correlation theory.Therefore, in structural capacity
Learn the inexorable trend for introducing that experiment link is its teaching development in teaching.
The Chinese patent that reaction frame in multispan beam structural experiment model of the present invention has disclosed with this seminar
A kind of (2015107123346 experiment device for teaching for intuitively changing force method；2015107079593 a kind of intuitively changing displacement method
Experiment device for teaching) in content it is similar, reaction frame only serve support and provide guide rail effect, be not the present invention wound
New construction.
In each chapters and sections of Teaching of Structural Mechanics, with girder structure for most basic research object, so invention is a kind of more
Bridge structural experiment device is particularly important to research structure mechanics correlation theory.
Invention content
To change the present situation for lacking related experiment link in current Teaching of Structural Mechanics, a kind of multispan beam structural experiment is invented
Device, the apparatus structure is simple, it is repeatable utilize, measurement result it is accurate, can realize that structural mechanics influences line and Torque distribution
The experiment of the contents of courses such as method.By experiment, make students more accurate understanding structural mechanics correlation theory and hypothesis.
Technical scheme is as follows：
A kind of multispan beam structural experiment model includes multispan girder construction, electrical servo loading device, restricted joint angle and load
Device, bearing and restraint device and measuring apparatus.
The multispan girder construction is divided into static determinacy multispan girder construction and indeterminate multispan girder construction.
The static determinacy multispan girder construction includes rectangular tab rod piece 1a, 1b and bolt 2b.The one end rectangular tab rod piece 1a is logical
It crosses bolt 2b with one end of rectangular tab rod piece 1b to be connected, realizes that two bars are hinged；The other end passes through pin 2a and fixed-hinged support
It is connected, intermediate position is connected by pin 2a with movable hinged-support；The other end of rectangular tab rod piece 1b passes through pin 2a and work
Dynamic hinged-support is connected, and realizes that static determinacy multispan girder construction is connect with bearing.
The indeterminate multispan girder construction includes rectangular tab rod piece 1c, 1b and bolt 2b.The one end rectangular tab rod piece 1c
It is connected with one end of rectangular tab rod piece 1b by bolt 2b, realizes that two rod pieces are hinged；The other end passes through T shape block 2c-1 and square
The clamping of shape block 2c-2, is connected with hold-down support 3a, and for fixing rectangular tab rod piece 1b, wherein T shapes block 2c-1 passes through
Screw is connect with hold-down support 3a；Two positions, which are connected by pin 2a with movable hinged-support, among rectangular tab rod piece 1c realizes hinge
It connects.The other end of the rectangular tab rod piece 1b is connected by pin 2a with movable hinged-support, realizes indeterminate multispan beam knot
The connection of structure and bearing.
There are two types of structure, two kinds of structures to work respectively with together with its control system for the electrical servo loading device, all
There are Bit andits control load and load control load two ways.By electrical servo loading device, realize to multispan girder construction
External force loads, and loading device is loaded by own control systems, and can show the position of load and load(ing) point
It moves.
The first electrical servo loading device includes low frequency electric cylinder 4, connector 5, load bar 6 and rod piece fixture A7, is used
Rectangular tab rod piece 1a, 1b and 1c are acted directly in vertical load；Described 4 one end of low frequency electric cylinder passes through screw and trolley
Platform 10 is connected, and trolley platform 10 is mounted on by four sliding blocks of bottom on the guide rail of reaction frame 11,10 energy of trolley platform
It is enough to be moved horizontally along guide rail；4 other end of low frequency electric cylinder is connected by provided with threaded connector 5 with load bar 6, load bar
6 are connected by screw thread with rod piece fixture A7.The rod piece fixture A7 includes connector 7a, pin 7b, spill rod piece intermediate plate 7c
With spill rod piece intermediate plate 7d；Described one end connector 7a is connected by screw thread and load bar 6, and the other end has threaded small
Hole is connect by screw thread with pin 7b；The spill rod piece intermediate plate 7c is connect by threaded aperture with pin 7b, spill bar
Part intermediate plate 7d is connected by screw with spill rod piece intermediate plate 7c, for gripping rod piece 1a, 1b and 1c.
Second of electrical servo loading device includes low frequency electric cylinder 4, connector 5, load bar 6, rod piece fixture B8 and divides
With beam 9, the internal force for the lower multispan beam of node carrying influences line.The trolley platform 10, low frequency electric cylinder 4,5 and of connector
Load bar 6 is sequentially connected, and rod piece fixture B8 is connected by screw with distribution beam 9, and distribution beam 9 is transferred the load to by pin 2a
Rectangular tab rod piece 1a, 1b and 1c realize external force load；The position that distribution beam 9 is connect with pin 2a has and pin 2a outer diameters
Consistent arc notch ensures the stability of external force loading procedure.The rod piece fixture B8 includes connector 8a, cylindrical inserts
Sell 8b, H-shaped rod piece intermediate plate 8c and rectangle rod piece intermediate plate 8d；Described one end connector 8a is connected by screw thread with load bar 6, separately
One end is connected by pin hole with cylinder plugs 8b；Cylinder plugs 8b again with the one end H-shaped rod piece intermediate plate 8c phase with pin hole
Even；The H-shaped rod piece intermediate plate 8c other ends are connected by screw with rectangle rod piece intermediate plate 8d, for gripping distribution beam 9.
The restricted joint angle and loading device 12 includes screw-threaded shaft elevator 12a, torque sensor 12b, servo-actuated disk 12c
With connector 12e.The bottoms screw-threaded shaft elevator 12a are screwed on rectangle hollow cushion block 12f, rectangle hollow pad
Block 12f is screwed on trolley platform 10, and rectangle hollow cushion block 12f ensures screw-threaded shaft elevator 12a and rectangular tab bar
Part 1a, 1b and 1c are highly consistent, realize the effect of the position of fixed screw-threaded shaft elevator 12a.Described one end torque sensor 12b
It is screwed servo-actuated disk 12c, its bearing is inserted into screw-threaded shaft elevator 12a by the other end.Described one end connector 12e
It is connected with servo-actuated disk 12c by pin 12d, middle part is inserted into the circular hole of hinged-support 3b, and corner is bolted in the other end
Sensor, for measuring corner size；The connector 12e also has rectangular apertures hole and rectangular tab bar at intermediate position
Part 1a, 1b are identical with 1c sizes, ensure rectangular tab rod piece 1a, 1b and 1c directly through rectangular apertures, rectangular apertures hole top
With bolt hole, rod piece 1a, 1b and 1c and connector 12e are fixed together by bolt.The restricted joint angle and load
Device can be used in constraining the rotation of multispan beam pin joint, and the torque generated at node is measured by torque sensor；Described
Restricted joint angle and loading device can also make multispan girder construction generate angular displacement at node by applying moment of flexure to pin joint,
Angular displacement numerical value can be measured by rotary angle transmitter.
The bearing and restraint device includes the constraint bearing of reaction frame 11 and multispan girder construction.The reaction frame
11 be door shape frame form, including reaction frame 11a and two pedestal 11b, pedestal 11b are used to support whole device.Described is anti-
Power frame 11a includes that built-in two crossbeams up and down of guide rail and the column of left and right two of built-in guide rail, upper beam guide rail pass through sliding block
Fixed trolley platform 10, for trolley platform 10 by screw connection loading device, bottom end rail guide rail fixes trolley platform 10, and trolley is flat
Platform 10 is bolted rectangle square pier 13.13 top of rectangle square pier is screwed cylinder cushion block 14 or fixed
Slideway 15, when 13 top stationary cylinder cushion block 14 of rectangle square pier, branch is fixed in 14 top of cylinder cushion block by screw connection
Seat 3a or hinged-support 3b, realizes hold-down support or fixed-hinged support；When 13 top ground way 15 of rectangle square pier, on slideway 15
Side passes through screw connection hinged-support 3b, realization activity hinged-support；Above-mentioned hold-down support, fixed-hinged support and movable hinged-support are constituted
Supporting structure.
The measuring apparatus includes force snesor, foil gauge, rotary angle transmitter and dial gauge.The strain gauge adhesion
In the upper and lower both sides different location of rectangular tab rod piece 1a, 1b and 1c, rod piece internal force size and bearing are calculated by surveyed strain value
Counter-force；The payload values that the force sensor measuring external force of the low frequency electric cylinder 4 applies multispan girder construction；The corner
Sensor is secured by bolts on the connector 12e of rigid-framed structure, for measuring corner at node；The above measuring apparatus passes through
Data acquisition and analysis system is connect with computer, is monitored in real time to each item data by computer；The dial gauge is logical
It crosses Magnetic gauge stand and is fixed on reaction frame 11, the displacement for measuring rectangular tab rod piece 1a, 1b and 1c different location.
Above-mentioned multispan beam structural experiment model can be used in following structural mechanics experiment:
Making static determinacy multispan beam internal force for static method when static determinacy multispan beam structural experiment model influences line
The first step assembles static determinacy multispan girder construction, and determines each experimental point position, and rectangular tab rod piece (1a) is from left to right
It is followed successively by A, B, C, D and E, wherein left end mark A, intermediate position mark C, right end and the Thin Rectangular being connected with hinged-support (3b)
The connected position of piece rod piece (1b) marks E；Rectangular tab rod piece (1b) from left to right followed by F, G, H, wherein H is most right
Side.Measure the distance between each experimental point, i.e. the distance between AB, BC, CD, DE, EF, FG, GH；Rectangular tab rod piece (1a) and
Rectangular tab rod piece (1b) posts foil gauge among each experimental point, measures each foil gauge to the position of adjacent experimental point；
The trolley platform (10) for installing the first electrical servo loading device is moved horizontally to experimental point B by second step,
B points are connected with rectangular tab rod piece (1a)；
Third walks, and is preloaded to static determinacy multispan girder construction, and balance force snesor；
4th step applies vertical load F using graded loading way in experimental point positionp, while measuring rectangular tab bar
The numerical value of each point foil gauge, calculates each point moment of flexure on part (1a, 1b), and it is each under unit load effect to find out experimental point position
Moment of flexure at foil gauge；
5th step repeats the experiment of the 4th step at least three times, finds out experimental point position each foil gauge under unit load effect
The moment of flexure average value at place；
6th step is plotted in multispan beam structural bending moments figure when unit load acts on experimental point position, and finds out bearing
Counter-force；
The trolley platform (10) for installing the first electrical servo loading device is moved horizontally to experimental point D by the 7th step,
D points are connected with rectangular tab rod piece (1a), repeat the 4th step to the 6th step；
The trolley platform (10) for installing the first electrical servo loading device is moved horizontally to experimental point F by the 8th step,
F points are connected with rectangular tab rod piece (1b), repeat the 4th step to the 6th step；
The trolley platform (10) for installing the first electrical servo loading device is moved horizontally to experimental point G by the 9th step,
G points are connected with rectangular tab rod piece (1b), repeat the 4th step to the 6th step；
Tenth step, when applying unit load according to experimental point B, D, F and G, it is anti-to draw A point bearings for the end reaction value of A points
Power influences line；Similarly, influence line of reactions at C and H can be found out；
11st step, when applying unit load according to experimental point B, C, D, F and G, B point moments draw B point Moment Influences
Line；Similarly, drawing any point internal force influences line.
Making static determinacy multispan beam internal force for mobile law when static determinacy multispan beam structural experiment model influences line
The first step assembles static determinacy multispan girder construction, and determines each experimental point position, and rectangular tab rod piece (1a) is from left to right
A, B, C, D and E, wherein left end mark A, intermediate position mark C, right end and the rectangular tab bar being connected with (3b) are marked successively
The connected position of part (1b) marks E；Rectangular tab rod piece (1b) from left to right marks F, G, H successively again, and wherein H is in the rightmost side.
Measure the distance between each experimental point, i.e. the distance between AB, BC, CD, DE, EF, FG, GH；In B, D, F, G location arrangements percentage
Table；
Second step removes fixed-hinged support at experimental point A；
Third walks, the first electrical servo loading device is connected at experimental point, arranges a percentage again at experimental point
Table；
4th step preloads static determinacy multispan girder construction, each point dial gauge zero setting；Using graded loading way in reality
It tests a position and applies vertical load Fp, while each point percentage meter reading is read, when finding out experimental point generation unit displacement, other are each
Point dial gauge shift value；
5th step repeats the experiment of the 4th step at least three times, finds out experimental point position each point percentage under unit displacement effect
The moving average of table；
Each point dial gauge moving average line is made experimental point influence line of reactions by the 6th step；
7th step removes activity hinged-support at experimental point C, repeats third step to the 6th step, makes the influence of C point end reactions
Line；
8th step removes activity hinged-support at experimental point H, repeats third step to the 6th step, makes the influence of H point end reactions
Line.
When internal force of the static determinacy multispan beam structural experiment model for static determinacy multispan beam under node bearing mode influences line
The first step assembles static determinacy multispan girder construction, and determines each experimental point position, and rectangular tab rod piece (1a) carries out four etc.
Point, each segment length is equal to distribution beam length, from left to right marks experimental point A, B, C, D and E successively, and the installation of wherein A points is fixed
Hinged-support, D point installation activity hinged-supports, E points are connected with rectangular tab rod piece (1b)；Rectangular tab rod piece (1b) carries out second-class
Point, each segment length is equal to distribution beam length, and centre position marks F, and right end marks G with movable hinged-support link position；It measures
Distribute beam length.Rectangular tab rod piece (1a) and rectangular tab rod piece (1b) post foil gauge among each experimental point, measure each
Foil gauge is to the position of adjacent experimental point；
Distribution beam (9) is mounted on experimental point A and B by second step；
Third walks, and two experimental points H and I are arranged in distribution beam (9), measures the position of two experimental points；
4th step installs second of electrical servo loading device in the experimental point H of distribution beam (9)；
5th step preloads static determinacy multispan girder construction, and balances force snesor；Using graded loading way in reality
It tests a position and applies vertical load Fp, while the numerical value of each point foil gauge on rectangular tab rod piece (1a, 1b) is measured, it calculates each
Point moment of flexure, and find out moment of flexure of the experimental point position under unit load effect at each foil gauge；
6th step repeats the experiment of the 5th step at least three times, finds out experimental point position each foil gauge under unit load effect
The moment of flexure average value at place；
7th step is plotted in multispan beam structural bending moments figure when unit load acts on experimental point position, and finds out bearing
Counter-force；
The trolley platform (10) of 8th step, second of electrical servo loading device of installation is moved horizontally to experimental point I, repeats
5th step to the 7th step；
9th step, the end reaction value of A points when being installed on experimental point H and I according to distribution beam (9) and applying unit load,
Calculate the end reaction value of distribution beam (9) and A points when applying unit load at rectangular tab rod piece (1a or 1b) tie point；Together
Reason, can find out distribution beam (9) and the bearing of D and G when applying unit load at rectangular tab rod piece (1a or 1b) tie point is anti-
Force value；
Distribution beam (9) is installed on experimental point B and C, C and D, F and G, repeats the 5th step to the 9th step by the tenth step successively；
11st step, the trolley platform (10) for installing the first electrical servo loading device are moved horizontally to experimental point E, weight
Multiple 5th step to the 7th step；
12nd step, B point moments when applying unit load according to experimental point A, B, C, D, E, F, G draw B point moment of flexure shadows
Ring line；Similarly, drawing any point internal force influences line；
13rd step, A point end reaction values when applying unit load according to experimental point A, B, C, D, E, F, G draw A point branch
Seat counter-force line；Similarly, D, G point influence line of reactions are drawn.
Making indeterminate multispan beam internal force for static method when indeterminate multispan beam structural experiment model influences line
Indeterminate multispan girder construction is connected, static method, which makees indeterminate multispan beam internal force, influences the experimental method and static method of line
The experimental method for making static determinacy multispan beam internal force influence line is identical.
When indeterminate multispan beam structural experiment model makees indeterminate multispan beam influence line of reactions for mobile law
Indeterminate multispan girder construction is connected, mobile law makees the experimental method and machine of indeterminate multispan beam influence line of reactions
The experimental method that dynamic method makees static determinacy multispan beam influence line of reactions is identical.
Making indeterminate multispan beam corner for mobile law when indeterminate multispan beam structural experiment model influences line
The first step, assembles indeterminate multispan girder construction, and determines each experimental point position, rectangular tab rod piece (1c) from a left side to
It is right to mark A, B, C, D, E, F and G successively, wherein left end mark A, the intermediate position being connected with bearing (2a) mark respectively D and
F, the position that right end is connected with rectangular tab rod piece (1b) marks G；Rectangular tab rod piece (1b) from left to right again successively mark G,
H, I, wherein I is in the rightmost side.Measure the distance between each experimental point, i.e. the distance between AB, BC, CD, DE, EF, FG, GH, HI；
In B, C, E, G, H location arrangements dial gauge；
Second step, installing angle constraint and loading device (12) at the bearing of the positions experimental point D；
Third walks, and the handwheel of rotational lead screw elevator (12a) preloads indeterminate multispan girder construction, and balances
Rotary angle transmitter, each point dial gauge zero setting；
4th step applies rotational angle theta in experimental point position using graded loading way, while reading each point percentage meter reading,
When finding out experimental point generation unit rotation, other each point dial gauge shift values；
5th step repeats the experiment of the 4th step at least three times, finds out experimental point position each point percentage in the case where unit rotation acts on
The moving average of table；
6th step connects each point dial gauge moving average with fair line, and making experimental point corner displacement influences line；
7th step, installing angle constraint and loading device (12) at the bearing of the positions experimental point D repeat third step to the 6th
Step, making D point corner displacements influences line；
8th step, installing angle constraint and loading device (12) at the bearing of the positions experimental point F repeat third step to the 6th
Step, making F point corner displacements influences line；
9th step, installing angle constraint and loading device (12) at the bearing of the positions experimental point I repeat third step to the 6th
Step, making I point corner displacements influences line.
When indeterminate multispan beam structural experiment model makees indeterminate multispan beam moment distribution method for mobile law
The first step assembles indeterminate multispan beam moment distribution method original structure Experimental equipment, and determines each experimental point position,
Rectangular tab rod piece (1c) from left to right marks A, B, D and C successively, and wherein left end mark A, centre is connected with hinged-support (3b)
Position mark respectively B, right end mark C；Foil gauge is posted on the upper and lower surface of rectangular tab rod piece (1c), measures each foil gauge
To the position of adjacent experimental point；
The trolley platform (10) for installing the first electrical servo loading device is moved horizontally to experimental point D by second step,
D points are connected with rectangular tab rod piece (1c)；
Third walks, and is preloaded to indeterminate multispan girder construction, and balance force snesor；
4th step applies vertical load F using graded loading way in the positions experimental point Dp, while measuring rectangular tab bar
The numerical value of each point foil gauge, calculates each point moment of flexure on part (1c)；
5th step repeats the experiment of the 4th step at least three times, finds out experimental point position in vertical load FpEach strain under effect
Moment of flexure average value at piece draws indeterminate multispan beam original structure bending moment diagram；
6th step, installing angle constraint and loading device (12) at B point bearings, constraint B points rotation repeat third step and arrive
5th step makes load action bending moment diagram under indeterminate multispan beam constraint corner, finds out B point restraining moments Mp；
7th step dismantles the first electrical servo loading device, the handwheel of rotational lead screw elevator (12a), to indeterminate
Multispan girder construction is reversely preloaded, and counter balance torque sensor (12b)；
8th step, the handwheel of rotational lead screw elevator (12a) apply moment of flexure-Mp, while measuring rectangular tab rod piece (1c)
The numerical value of upper each point foil gauge, calculates each point moment of flexure；
9th step repeats the 7th step and the experiment of the 8th step at least three times, makes indeterminate multispan beam node rotation and individually make
Use bending moment diagram；
The bending moment diagram of 6th step and the 9th step is superimposed by the tenth step, and compared with the bending moment diagram of the 5th step.
The beneficial effects of the invention are as follows：Different experiment contents can be carried out using the experimental provision.The device structure set
Experiment of machanics model, loading device and measuring device, can be in the different locations of rod piece according to the needs of experiment content in one
Foil gauge is pasted, is loaded in the different location of rod piece, experimental model flexibility and changeability.Pass through experimental verification, this experimental provision gained
Experimental result calculates gained theoretical value with structural mechanics and compares error very little, and colleges and universities is suitble to carry out related teaching experiment and further
Design is expanded.
Description of the drawings
Fig. 1 is the detail of construction of rod piece fixture A；
Fig. 2 is the detail of construction of rod piece fixture B；
Fig. 3 a are the node vertical view with torque constraint and loading device；
Fig. 3 b are the node side view with torque constraint and loading device；
Fig. 4 a are hold-down support front view；
Fig. 4 b are hold-down support side view；
Fig. 4 c are hold-down support vertical view；
Fig. 5 a are hinged-support front view；
Fig. 5 b are hinged-support side view；
Fig. 5 c are hinged-support vertical view；
Fig. 6 is that static method makees static determinacy multispan beam internal force influence line original structure Experimental equipment；
Fig. 7 is that mobile law makees static determinacy multispan beam influence line of reactions Experimental equipment；
Fig. 8 is that static determinacy multispan beam internal force influences line Experimental equipment under node bearing mode；
Fig. 9 is that static method makees indeterminate multispan beam internal force influence line original structure Experimental equipment；
Figure 10 is that mobile law makees indeterminate multispan beam influence line of reactions Experimental equipment；
Figure 11, which is indeterminate multispan beam corner, influences line Experimental equipment；
Figure 12 is indeterminate multispan beam moment distribution method original structure Experimental equipment；
Figure 13 is that indeterminate multispan beam moment distribution method load action constrains corner Experimental equipment；
Figure 14 is indeterminate multispan beam moment distribution method node corner independent role Experimental equipment；
In figure：1a rectangular tab rod pieces a；1b rectangular tab rod pieces b；1c rectangular tab rod pieces c；2a pins；2b bolts；
2c-1T shape blocks；2c-2 rectangular blocks；3a hold-down supports；3b hinged-supports；4 low frequency electric cylinders；5 connector a；6 load bars；7 bars
Part fixture A；7a connectors b；7b pins；7c spill rod piece intermediate plates a；7d spill rod piece intermediate plates b；8 rod piece fixture B；8a connectors
c；8b cylinder plugs；8c H-shaped rod piece intermediate plates；8d rectangle rod piece intermediate plates；9 distribution beams；10 trolley platforms；11 reaction frames；
11a reaction frames；11b pedestals；12 restricted joint angles and loading device；12a screw-threaded shaft elevators；12b torque sensors；The servo-actuated circles of 12c
Disk；12d pins；12e connectors d；12f rectangle hollow cushion blocks；13 rectangle square piers；14 cylinder cushion blocks；15 slideways.
Specific implementation mode
Apparatus of the present invention can carry out multigroup experiment, including static method and mobile law make static determinacy multispan beam internal force influence line；
Static determinacy multispan beam internal force influences line under node bearing mode；Static method and mobile law, which make indeterminate multispan beam internal force, influences line；Position
Moving influences line；Indeterminate multispan beam moment distribution method etc..
Embodiments of the present invention are described further with embodiment below in conjunction with the accompanying drawings.
Multispan beam structural experiment device include multispan girder construction, electrical servo loading device, restricted joint angle and loading device,
Bearing and restraint device and measuring apparatus；The multispan girder construction is divided into two kinds of basic structures of statically determinate structure and redundant structure,
Two kinds of basic structures are formed by connecting by rod piece and pin；There are two types of structure, two kinds of knots for the electrical servo loading device
Structure works together with control system, there is Bit andits control load and load control load two ways；The restricted joint angle and
Loading device 12 includes screw-threaded shaft elevator 12a, torque sensor 12b, servo-actuated disk 12c and connector 12e；The bearing and
Restraint device includes the constraint bearing of reaction frame 11 and multispan girder construction；The measuring apparatus includes force snesor, strain
Piece, rotary angle transmitter and dial gauge.
The specific installation of experimental provision and embodiment are as follows：
Embodiment 1：Static method and mobile law, which make static determinacy multispan beam internal force, influences line
Fig. 6 is that static method makees static determinacy multispan beam internal force influence line original structure Experimental equipment.
Static determinacy multispan girder construction is made of rectangular tab rod piece 1a, 1b and bolt 2b.The one end rectangular tab rod piece 1a passes through
Bolt 2b is connected with rectangular tab rod piece 1b, and the other end is connected by pin 2a with fixed-hinged support, and intermediate position passes through pin
2a is connected with movable hinged-support；Rectangular tab one end rod piece 1b is connected by bolt 2b with rectangular tab rod piece 1a, and the other end is logical
It crosses pin 2a with movable hinged-support to be connected, realizes the connection of static determinacy multispan girder construction and bearing.
The electrical servo loading device is first successively by low frequency electric cylinder 4, connector 5, load bar 6 and rod piece fixture A7
Tail is connected through a screw thread.Rod piece fixture A7 is connect with vertical thin-walled bar 1a, is further applied load to static determinacy multispan girder construction.
Strain gauge adhesion calculates rod piece in the upper and lower both sides different location of rectangular tab rod piece 1a, 1b, by surveyed strain value
Each point internal force size and end reaction size；Low frequency electric cylinder 4 measures the payload values applied to static determinacy multispan girder construction；More than
Measuring apparatus is all connected to computer, is monitored in real time to each item data by computer.
The trolley platform 10 of electrical servo loading device connection moves horizontally, and changes the position of load(ing) point, load(ing) point is made to make
Used in the different location of rectangular tab rod piece 1a and rectangular tab rod piece 1b, it is big to measure rod piece each point internal force under Moving Loads
Small and end reaction size.
Fig. 7 is that mobile law makees static determinacy multispan beam influence line of reactions Experimental equipment.
The influence line of reactions that the connected fixed-hinged support 3b of rectangular tab rod piece 1a left ends is measured using mobile law, with
Original structure Fig. 6 is compared, and removes fixed-hinged support experimental provision 2a, 3b and 14, and the trolley that electrical servo loading device is connected
Platform 10 is moved horizontally to the vertical position of required bearing along the guide rail of reaction frame 11.By electrical servo loading device to institute
Bearing is asked to be further applied load.The disposed at equal distance dial gauge on rectangular tab rod piece 1a and rectangular tab rod piece 1b, dial gauge pass through
Magnetic gauge stand is fixed on reaction frame 11, measures the reading of each dial gauge.
Similarly, mobile law can be utilized to measure the influence line of reactions of other hinged-supports.
Embodiment 2：The internal force of static determinacy multispan beam influences line under node bearing mode
Fig. 8, which is the internal force of static determinacy multispan beam under node bearing mode, influences line Experimental equipment.
The static determinacy multispan girder construction is made of rectangular tab rod piece 1a, 1b and bolt 2b.The one end rectangular tab rod piece 1a
It is connected with rectangular tab rod piece 1b by bolt 2b, the other end is connected by pin 2a with fixed-hinged support, and intermediate position passes through
Pin 2a is connected with movable hinged-support；Rectangular tab one end rod piece 1b is connected by bolt 2b with rectangular tab rod piece 1a, another
End is connected by pin 2a with movable hinged-support, realizes the connection of static determinacy multispan girder construction and bearing.
The electrical servo loading device is by low frequency electric cylinder 4, connector 5, load bar 6, rod piece fixture B8 and distribution beam
9, it is connected through a screw thread from beginning to end successively, distribution beam 9 transfers the load to beam by pin 2a, realizes the load of node bearing mode.
The surveyed strain value of foil gauge by being pasted onto rectangular tab rod piece 1a, 1b calculates rod piece each point internal force size and branch
Seat counter-force size；Low frequency electric cylinder 4 measures the payload values applied to static determinacy multispan girder construction；The above measuring apparatus is all connected to
Computer monitors each item data by computer in real time.
The trolley platform 10 of electrical servo loading device connection moves horizontally, and changes the position of load(ing) point, load(ing) point is made to make
Used in the different location of rectangular tab rod piece 1a and rectangular tab rod piece 1b, it is big to obtain rod piece each point internal force under Moving Loads
Small and end reaction size.
Embodiment 3：Static method and mobile law, which make indeterminate multispan beam internal force, influences line
Fig. 9 is that static method makees indeterminate multispan beam internal force influence line original structure Experimental equipment.
The indeterminate multispan girder construction is made of rectangular tab rod piece 1c, 1b and bolt 2b.Rectangular tab rod piece 1c mono-
End, which is connected by bolt 2b with rectangular tab rod piece 1b, realizes that two rod pieces are hinged, and the other end is kept off by T shape block 2c-1 and rectangle
Block 2c-2 clampings are connected with hold-down support 3a realizes fixing end, and two positions pass through pin 2a and activity among rectangular tab rod piece 1c
Connected realize of hinged-support is hinged；Rectangular tab one end rod piece 1b is connected by bolt 2b with rectangular tab rod piece 1a, and the other end is logical
It crosses pin 2a with movable hinged-support to be connected, realizes the connection of indeterminate multispan girder construction and bearing.
The electrical servo loading device is first successively by low frequency electric cylinder 4, connector 5, load bar 6 and rod piece fixture A7
Tail is connected through a screw thread.Rod piece fixture A7 is connect with rectangular tab rod piece 1c, is further applied load to indeterminate multispan girder construction.
Strain gauge adhesion calculates rod piece in the upper and lower both sides different location of rectangular tab rod piece 1c, 1b, by surveyed strain value
Each point internal force size and end reaction size；Low frequency electric cylinder 4 measures the payload values applied to indeterminate multispan girder construction；With
Upper measuring apparatus is all connected to computer, is monitored in real time to each item data by computer.
The trolley platform 10 of electrical servo loading device connection moves horizontally, and changes the position of load(ing) point, load(ing) point is made to make
Used in the different location of rectangular tab rod piece 1c and rectangular tab rod piece 1b, it is big to measure rod piece each point internal force under Moving Loads
Small and end reaction size.
Figure 10 is that mobile law makees indeterminate multispan beam influence line of reactions Experimental equipment.
The influence line of reactions that movable hinged-support 3b connected among rectangular tab rod piece 1c is measured using mobile law, with
Original structure Fig. 9 is compared, and removes hinged-support experimental provision 2a, 3b and 15, and the trolley platform that electrical servo loading device is connected
10 are moved horizontally to the vertical position of required bearing along the guide rail of reaction frame 11.By electrical servo loading device to required branch
Seat is further applied load.The disposed at equal distance dial gauge on rectangular tab rod piece 1c and rectangular tab rod piece 1b, dial gauge pass through magnetism
Gauge stand is fixed on reaction frame 11, measures the reading of each dial gauge.
Similarly, mobile law can be utilized to measure the influence line of reactions of other hinged-supports.
Embodiment 4：Displacement influence line
Figure 11, which is indeterminate multispan beam corner, influences line Experimental equipment.
Compared with Fig. 9, remove electrical servo loading device, increases corner about in rectangular tab rod piece 1c intermediate supports position
Beam and loading device are sequentially connected by screw-threaded shaft elevator 12a, torque sensor 12b, servo-actuated disk 12c and connector 12e.It is logical
The active rotating shaft for crossing rotational lead screw elevator 12a applies moment of flexure to node at the bearing 3b of indeterminate multispan beam, makes to produce at node
Raw corner, can measure angular displacement numerical value, torque sensor 12b can measure multispan girder construction and be produced at node by rotary angle transmitter
Raw torque.The disposed at equal distance dial gauge on rectangular tab rod piece 1c and rectangular tab rod piece 1b, dial gauge pass through magnetic table
Seat is fixed on reaction frame 11, measures the reading of each dial gauge.
Similarly, the corner that mobile law can be utilized to measure other hinged-supports influences line.
Embodiment 5：Indeterminate multispan beam moment distribution method
Figure 12 is indeterminate multispan beam moment distribution method original structure Experimental equipment.Compared with Fig. 9, appendage is reduced,
That is rectangular tab rod piece 1b and related hinged-support.
It is further applied load to indeterminate multispan girder construction using electrical servo loading device.Low frequency electric cylinder 4 is measured to super quiet
Determine the payload values that multispan girder construction is applied；The surveyed strain value of foil gauge by being pasted onto rectangular tab rod piece 1c calculates rod piece
Each point moment of flexure size, and draw bending moment diagram.
Figure 13 is that indeterminate multispan beam moment distribution method load action constrains corner Experimental equipment.Compared with Figure 12,
Rectangular tab rod piece 1c intermediate supports position increases restricted joint angle and loading device 12, the corner of intermediate support is constrained, after load
Binding occurrence size is measured by torque sensor 12b.The surveyed strain value of foil gauge is pasted by institute rectangular tab rod piece 1c to calculate
Rod piece each point moment of flexure size, and draw bending moment diagram.
Figure 14 is indeterminate multispan beam moment distribution method node corner independent role Experimental equipment.Compared with figure 13, it goes
Servo-loading unit is moved in power down, by the shaft of rotational lead screw elevator 12a to the positions rectangular tab rod piece 1c intermediate support 3b
Node applies moment of flexure, and multispan girder construction is made to generate corner at node.Angular displacement numerical value, torque can be measured by rotary angle transmitter
Sensor 12b can measure the moment of flexure that multispan girder construction generates at node, paste foil gauge institute by institute rectangular tab rod piece 1c
It surveys strain value and calculates rod piece each point moment of flexure size, and draw bending moment diagram.
Claims (10)
1. a kind of multispan beam structural experiment model, which is characterized in that the multispan beam structural experiment model includes multispan girder construction, electricity
Dynamic servo-loading unit, restricted joint angle and loading device, bearing and restraint device and measuring apparatus；
The multispan girder construction is divided into static determinacy multispan girder construction and indeterminate multispan girder construction；
The static determinacy multispan girder construction includes rectangular tab rod piece a (1a), rectangular tab rod piece b (1b) and bolt (2b)；Rectangle
The one end (1a) thin slice rod piece a is connected by bolt (2b) with one end of rectangular tab rod piece b (1b), realizes that two rod pieces are hinged；
The other end is connected by pin (2a) with fixed-hinged support, and intermediate position is connected by pin (2a) with movable hinged-support；Rectangle
The other end of thin slice rod piece b (1b) is connected by pin (2a) with movable hinged-support, and static determinacy multispan girder construction is connect with bearing；
The indeterminate multispan girder construction includes rectangular tab rod piece c (1c), rectangular tab rod piece b (1b) and bolt (2b)；Square
Shape one end (1c) thin slice rod piece c is connected by bolt (2b) with one end of rectangular tab rod piece b (1b), realizes that two rod pieces are hinged；
The other end is connected, for fixing rectangle by the clamping of T shapes block (2c-1) and rectangular block (2c-2) with hold-down support (3a)
Thin slice rod piece b (1b)；Rectangular tab rod piece c (1c) is intermediate to be connected with movable hinged-support, realizes hinged；The rectangular tab bar
The other end of part b (1b) is connected by pin (2a) with movable hinged-support, realizes the connection of indeterminate multispan girder construction and bearing；
There are two types of structure, two kinds of structures to be connect respectively with its control system for the electrical servo loading device, and two kinds of structures are equal
There are Bit andits control load and load control load two ways；
The first electrical servo loading device includes low frequency electric cylinder (4), connector a (5), load bar (6) and rod piece fixture A
(7), rectangular tab rod piece a (1a), rectangular tab rod piece b (1b) and rectangular tab rod piece c are acted directly on for vertical load
(1c)；Described low frequency electric cylinder (4) one end is connected with trolley platform (10), and trolley platform (10) is mounted on reaction frame (11)
Guide rail on；Low frequency electric cylinder (4) other end is connected by provided with threaded connector a (5) with load bar (6), load bar
(6) it is connected with rod piece fixture A (7)；
Second of electrical servo loading device includes low frequency electric cylinder (4), connector a (5), load bar (6), rod piece fixture B (8)
With distribution beam (9)；Trolley platform (10), low frequency electric cylinder (4), connector a (5) and the load bar (6) is sequentially connected, bar
Part fixture B (8) is connected with distribution beam (9), distribution beam (9) by pin (2a) transfer the load to rectangular tab rod piece a (1a),
Rectangular tab rod piece b (1b) and rectangular tab rod piece c (1c) realizes external force load；The portion that distribution beam (9) is connect with pin (2a)
Position has the arc notch consistent with pin (2a) outer diameter, ensures the stability of external force loading procedure；
The restricted joint angle and loading device (12) include screw-threaded shaft elevator (12a), torque sensor (12b), servo-actuated disk
(12c) and connector d (12e)；Described bottom screw-threaded shaft elevator (12a) is fixed on rectangle hollow cushion block (12f), and rectangle is empty
Heart cushion block (12f) is fixed on trolley platform (10), and rectangle hollow cushion block (12f) is for ensureing screw-threaded shaft elevator (12a) and square
Shape thin slice rod piece a (1a), rectangular tab rod piece b (1b), rectangular tab rod piece c (1c) are highly consistent；The torque sensor
The one end (12b) is fixed on servo-actuated disk (12c), its bearing of the other end is inserted into screw-threaded shaft elevator (12a)；The connector
The one end (12e) d is connected with servo-actuated disk (12c), and middle part is inserted into the circular hole of hinged-support (3b), and the other end connects rotation angular sensing
Device, for measuring corner size；The middle part of the connector d (12e) is used for across rectangular tab rod piece a (1a), rectangle
Screw is inserted by rectangular tab rod piece a (1a), rectangular tab in thin slice rod piece b (1b) and rectangular tab rod piece c (1c), hole top
Rod piece b (1b) and rectangular tab rod piece c (1c) are fixed on connector d (12e)；
The bearing and restraint device includes the constraint bearing of reaction frame (11) and multispan girder construction；The reaction frame
(11) include reaction frame (11a) and two pedestals (11b), the reaction frame (11a) includes two cross up and down of built-in guide rail
The column of left and right two of beam and built-in guide rail, lower and upper cross-member guide rail installation carriage platform (10), rectangle square pier (13) are fixed on down
On the trolley platform (10) of crossbeam installation；Stationary cylinder cushion block (14) or ground way above the rectangle square pier (13)
(15), above rectangle square pier (13) when stationary cylinder cushion block (14), bearing is connected and fixed above cylinder cushion block (14)
(3a) or hinged-support (3b) realizes hold-down support or fixed-hinged support；It is sliding above rectangle square pier (13) when ground way (15)
Connection hinged-support (3b), realization activity hinged-support above road (15)；Hold-down support, fixed-hinged support and the movable hinged-support
Constitute supporting structure；
The measuring apparatus includes force snesor, foil gauge, rotary angle transmitter and dial gauge；The strain gauge adhesion is in square
Shape thin slice rod piece a (1a), rectangular tab rod piece b (1b) and the upper and lower both sides different locations of rectangular tab rod piece c (1c), pass through institute
It surveys strain value and calculates rod piece internal force size and end reaction；The force sensor measuring external force of the low frequency electric cylinder (4) is to more
The payload values that bridge structure is applied；The rotary angle transmitter is fixed on connector d (12e), is turned at node for measuring
Angle；The dial gauge is fixed on reaction frame (11), for measuring rectangular tab rod piece a (1a), rectangular tab rod piece b
The displacement of (1b) and rectangular tab rod piece c (1c) different location；Measuring apparatus is connected by data acquisition and analysis system and computer
It connects, each item data is monitored in real time by computer.
2. a kind of multispan beam structural experiment model according to claim 1, which is characterized in that the rod piece fixture A (7)
Including connector b (7a), pin (7b), spill rod piece intermediate plate a (7c) and spill rod piece intermediate plate b (7d)；The connector b
The one end (7a) is connect with load bar (6), and the other end is connect with pin (7b)；The rod piece intermediate plate a (7c) connects with pin (7b)
It connects, rod piece intermediate plate b (7d) is connected with rod piece intermediate plate a (7c), by rectangular tab rod piece a (1a), rectangular tab rod piece b (1b) and square
Shape thin slice rod piece c (1c) is gripped.
3. a kind of multispan beam structural experiment model according to claim 1 or 2, which is characterized in that the rod piece fixture B
(8) include connector c (8a), cylinder plugs (8b), H-shaped rod piece intermediate plate (8c) and rectangle rod piece intermediate plate (8d)；The company
The one end (8a) fitting c is connected with load bar (6), and the other end is connected by pin hole with cylinder plugs (8b)；Cylinder plugs
(8b) is connected with one end H-shaped rod piece intermediate plate (8c) with pin hole again；H-shaped rod piece intermediate plate (8c) other end and rectangle rod piece intermediate plate
(8d) is connected, for gripping distribution beam (9).
4. the static determinacy multispan beam structural experiment model in the multispan beam structural experiment model described in claims 1 or 2 or 3 is used for
Static method, which makees static determinacy multispan beam internal force, influences line experimental method, it is characterised in that following steps：
The first step assembles static determinacy multispan girder construction, and determines each experimental point position, rectangular tab rod piece a (1a) from left to right according to
Secondary is A, B, C, D and E, wherein left end mark A, intermediate position mark C, right end and the rectangular tab being connected with hinged-support (3b)
Position connected rod piece b (1b) marks E；Rectangular tab rod piece b (1b) from left to right followed by F, G, H, wherein H is most right
Side；Measure the distance between each experimental point, i.e. the distance between AB, BC, CD, DE, EF, FG, GH；Rectangular tab rod piece a (1a)
Foil gauge is posted among each experimental point with rectangular tab rod piece b (1b), measures each foil gauge to the position of adjacent experimental point；
The trolley platform (10) for installing the first electrical servo loading device is moved horizontally to experimental point B, in B points by second step
It is connected with rectangular tab rod piece a (1a)；
Third walks, and is preloaded to static determinacy multispan girder construction, and balance force snesor；
4th step applies vertical load F using graded loading way in experimental point positionp, while measuring rectangular tab rod piece a
The numerical value of each point foil gauge, calculates each point moment of flexure on (1a) and rectangular tab rod piece b (1b), and finds out experimental point position in list
Moment of flexure under the load action of position at each foil gauge；
5th step repeats the experiment of the 4th step at least three times, finds out experimental point position under unit load effect at each foil gauge
Moment of flexure average value；
6th step is plotted in multispan beam structural bending moments figure when unit load acts on experimental point position, and finds out end reaction；
The trolley platform (10) for installing the first electrical servo loading device is moved horizontally to experimental point D, in D points by the 7th step
It is connected with rectangular tab rod piece a (1a), repeats the 4th step to the 6th step；
The trolley platform (10) for installing the first electrical servo loading device is moved horizontally to experimental point F, in F points by the 8th step
It is connected with rectangular tab rod piece b (1b), repeats the 4th step to the 6th step；
The trolley platform (10) for installing the first electrical servo loading device is moved horizontally to experimental point G, in G points by the 9th step
It is connected with rectangular tab rod piece b (1b), repeats the 4th step to the 6th step；
Tenth step, when applying unit load according to experimental point B, D, F and G, the end reaction value of A points draws A point end reaction shadows
Ring line；Similarly, influence line of reactions at C and H is found out；
11st step, when applying unit load according to experimental point B, C, D, F and G, B point moments draw B point bending-moment influence lines；
Similarly, drawing any point internal force influences line.
5. the static determinacy multispan beam structural experiment model in the multispan beam structural experiment model described in claims 1 or 2 or 3 is used for
Mobile law, which makees static determinacy multispan beam internal force, influences line experimental method, it is characterised in that following steps：
The first step assembles static determinacy multispan girder construction, and determines each experimental point position, rectangular tab rod piece a (1a) from left to right according to
Secondary mark A, B, C, D and E, wherein left end mark A, intermediate position mark C, right end and the Thin Rectangular being connected with hinged-support (3b)
Position connected piece rod piece b (1b) marks E；Rectangular tab rod piece b (1b) from left to right marks F, G, H successively again, and wherein H is most
Right side；Measure the distance between each experimental point, i.e. the distance between AB, BC, CD, DE, EF, FG, GH；In the position B, D, F, G cloth
Set dial gauge；
Second step removes fixed-hinged support at experimental point A；
Third walks, the first electrical servo loading device is connected at experimental point, arranges a dial gauge again at experimental point；
4th step preloads static determinacy multispan girder construction, each point dial gauge zero setting；Using graded loading way in experimental point
Position applies vertical load Fp, while each point percentage meter reading is read, and when finding out experimental point generation unit displacement, other each points hundred
Divide table shift value；
5th step repeats the experiment of the 4th step at least three times, finds out experimental point position each point dial gauge under unit displacement effect
Moving average；
Each point dial gauge moving average line is made experimental point influence line of reactions by the 6th step；
7th step removes activity hinged-support at experimental point C, repeats third step to the 6th step, makes C point influence line of reactions；
8th step removes activity hinged-support at experimental point H, repeats third step to the 6th step, makes H point influence line of reactions.
6. the static determinacy multispan beam structural experiment model in the multispan beam structural experiment model described in claims 1 or 2 or 3 is used for
The internal force of static determinacy multispan beam influences line experimental method under node bearing mode, it is characterised in that following steps：
The first step assembles static determinacy multispan girder construction, and determines that each experimental point position, rectangular tab rod piece a (1a) carry out the quartering,
Each segment length is equal to distribution beam length, from left to right marks experimental point A, B, C, D and E successively, and the installation fixation of wherein A points is hinged
Seat, D point installation activity hinged-supports, E points are connected with rectangular tab rod piece b (1b)；Rectangular tab rod piece b (1b) is halved,
Each segment length is equal to distribution beam length, and centre position marks F, and right end marks G with movable hinged-support link position；Measure distribution
Beam length；Rectangular tab rod piece a (1a) and rectangular tab rod piece b (1b) posts foil gauge among each experimental point, and measurement is respectively answered
Become piece to the position of adjacent experimental point；
Distribution beam (9) is mounted on experimental point A and B by second step；
Third walks, and two experimental points H and I are arranged in distribution beam (9), measures the position of two experimental points；
4th step installs second of electrical servo loading device in the experimental point H of distribution beam (9)；
5th step preloads static determinacy multispan girder construction, and balances force snesor；Using graded loading way in experimental point
Position applies vertical load Fp, while measuring each point foil gauge on rectangular tab rod piece a (1a) and rectangular tab rod piece b (1b)
Numerical value calculates each point moment of flexure, and finds out moment of flexure of the experimental point position under unit load effect at each foil gauge；
6th step repeats the experiment of the 5th step at least three times, finds out experimental point position under unit load effect at each foil gauge
Moment of flexure average value；
7th step is plotted in multispan beam structural bending moments figure when unit load acts on experimental point position, and finds out end reaction；
The trolley platform (10) of 8th step, second of electrical servo loading device of installation is moved horizontally to experimental point I, repeats the 5th
It walks to the 7th step；
9th step, the end reaction value of A points when being installed on experimental point H and I according to distribution beam (9) and applying unit load calculate
Go out A points when applying unit load at distribution beam (9) and rectangular tab rod piece a (1a) and rectangular tab rod piece b (1b) tie point
End reaction value；Similarly, distribution beam (9) and rectangular tab rod piece a (1a) and rectangular tab rod piece b (1b) tie point can be found out
The end reaction value of D and G when place applies unit load；
Distribution beam (9) is installed on experimental point B and C, C and D, F and G, repeats the 5th step to the 9th step by the tenth step successively；
11st step, the trolley platform (10) for installing the first electrical servo loading device are moved horizontally to experimental point E, repeat the
Five steps to the 7th step；
12nd step, B point moments when applying unit load according to experimental point A, B, C, D, E, F, G draw B point Moment Influences
Line；Similarly, drawing any point internal force influences line；
It is anti-to draw A point bearings for 13rd step, A point end reaction values when applying unit load according to experimental point A, B, C, D, E, F, G
The line of force；Similarly, D, G point influence line of reactions are drawn.
7. the indeterminate multispan beam structural experiment model in the multispan beam structural experiment model described in claims 1 or 2 or 3 is used
Making indeterminate multispan beam internal force in static method influences line experimental method, it is characterised in that following steps：
Connect indeterminate multispan girder construction, static method make indeterminate multispan beam internal force influence line experimental method make with static method it is quiet
The experimental method for determining multispan beam internal force influence line is identical.
8. the indeterminate multispan beam structural experiment model in the multispan beam structural experiment model described in claims 1 or 2 or 3 is used
Make indeterminate multispan beam influence line of reactions experimental method in mobile law, it is characterised in that following steps：
Indeterminate multispan girder construction is connected, mobile law makees the experimental method and mobile law of indeterminate multispan beam influence line of reactions
The experimental method for making static determinacy multispan beam influence line of reactions is identical.
9. the indeterminate multispan beam structural experiment model in the multispan beam structural experiment model described in claims 1 or 2 or 3 is used
Making indeterminate multispan beam corner in mobile law influences line experimental method, it is characterised in that following steps：
The first step assembles indeterminate multispan girder construction, and determines each experimental point position, and rectangular tab rod piece c (1c) is from left to right
Mark A, B, C, D, E, F and G successively, wherein left end mark A, the intermediate position being connected with hinged-support (3b) mark respectively D and
F, the position that right end is connected with rectangular tab rod piece b (1b) marks G；Rectangular tab rod piece b (1b) is from left to right marked successively again
G, H, I, wherein I is in the rightmost side；Measure the distance between each experimental point, i.e., between AB, BC, CD, DE, EF, FG, GH, HI away from
From；In B, C, E, G, H location arrangements dial gauge；
Second step, installing angle constraint and loading device (12) at the bearing of the positions experimental point D；
Third walks, and the handwheel of rotational lead screw elevator (12a) preloads indeterminate multispan girder construction, and balances corner
Sensor, each point dial gauge zero setting；
4th step applies rotational angle theta in experimental point position using graded loading way, while reading each point percentage meter reading, finds out
When experimental point generates unit rotation, other each point dial gauge shift values；
5th step repeats the experiment of the 4th step at least three times, finds out experimental point position each point dial gauge in the case where unit rotation acts on
Moving average；
6th step connects each point dial gauge moving average with fair line, and making experimental point corner displacement influences line；
7th step, installing angle constraint and loading device (12) at the bearing of the positions experimental point D repeat third and walk to the 6th step,
Making D point corner displacements influences line；
8th step, installing angle constraint and loading device (12) at the bearing of the positions experimental point F repeat third and walk to the 6th step,
Making F point corner displacements influences line；
9th step, installing angle constraint and loading device (12) at the bearing of the positions experimental point I repeat third and walk to the 6th step,
Making I point corner displacements influences line.
10. by the indeterminate multispan beam structural experiment model in the multispan beam structural experiment model described in claims 1 or 2 or 3
Make indeterminate multispan beam moment distribution method experimental method for mobile law, it is characterised in that following steps：The first step, assembling are super quiet
Determine multispan beam moment distribution method original structure Experimental equipment, and determine each experimental point position, rectangular tab rod piece c (1c) from a left side to
Right to mark A, B, D and C successively, wherein left end mark A, the intermediate position being connected with hinged-support (3b) mark B, right end respectively
Mark C；Rectangular tab rod piece c (1c) posts foil gauge in upper and lower surface, measures each foil gauge to the position of adjacent experimental point；
The trolley platform (10) for installing the first electrical servo loading device is moved horizontally to experimental point D, in D points by second step
It is connected with rectangular tab rod piece c (1c)；
Third walks, and is preloaded to indeterminate multispan girder construction, and balance force snesor；
4th step applies vertical load F using graded loading way in the positions experimental point Dp, while measuring rectangular tab rod piece c
The numerical value of each point foil gauge on (1c), calculates each point moment of flexure；
5th step repeats the experiment of the 4th step at least three times, finds out experimental point position in vertical load FpUnder effect at each foil gauge
Moment of flexure average value draws indeterminate multispan beam original structure bending moment diagram；
6th step, installing angle constraint and loading device (12) at B point bearings, constraint B points rotation repeat third step to the 5th
Step makes load action bending moment diagram under indeterminate multispan beam constraint corner, finds out B point restraining moments Mp；
7th step dismantles the first electrical servo loading device, the handwheel of rotational lead screw elevator (12a), to indeterminate multispan
Girder construction is reversely preloaded, and counter balance torque sensor (12b)；
8th step, the handwheel of rotational lead screw elevator (12a) apply moment of flexure-Mp, while measuring each on rectangular tab rod piece c (1c)
The numerical value of point foil gauge, calculates each point moment of flexure；
9th step repeats the 7th step and the experiment of the 8th step at least three times, it is curved to make indeterminate multispan beam node rotation independent role
Square figure；
The bending moment diagram of 6th step and the 9th step is superimposed by the tenth step, and compared with the bending moment diagram of the 5th step.
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| CN111024421B (en) * | 2019-10-28 | 2021-09-17 | 安徽建筑大学 | Beam bridge damage detection method based on elastic constraint supporting beam corner influence line |
| CN111157336B (en) * | 2019-12-26 | 2022-05-27 | 宁夏建筑科学研究院股份有限公司 | Beam type structure field load simulation experiment detection device and detection method thereof |
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