CN106644324A - Test device for light steel frame beam column node bearing test - Google Patents

Test device for light steel frame beam column node bearing test Download PDF

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Publication number
CN106644324A
CN106644324A CN201611253839.1A CN201611253839A CN106644324A CN 106644324 A CN106644324 A CN 106644324A CN 201611253839 A CN201611253839 A CN 201611253839A CN 106644324 A CN106644324 A CN 106644324A
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plate
test specimen
loading
column node
groove
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CN201611253839.1A
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CN106644324B (en
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张宗敏
曹万林
刘子斌
刘岩
边瑾靓
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Beijing University of Technology
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Beijing University of Technology
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M5/00Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
    • G01M5/0041Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress
    • G01M5/005Investigating 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
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M5/00Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
    • G01M5/0041Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress
    • G01M5/005Investigating 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
    • G01M5/0058Investigating 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 of elongated objects, e.g. pipes, masts, towers or railways

Abstract

The invention discloses a test device for light steel frame beam column node bearing test. The device includes a device bottom plate assembled and fixed to a universal testing machine, a lower clamp groove provided with a light steel frame beam column, an upper clamp groove, fastening bolts for fixing the light steel frame beam column, an upper cover plate for fixing the light steel frame beam column, a bottom plate long groove for changing the loading point position, side plates connecting the bottom plate with the top plate, clamping plates for beam end loading, a hinge rod for loading an end, a beam column connection node test piece, and a mechanical universal testing machine. The whole test device can not only effectively realize the bearing performance test constraint condition of the beam column node, but also can measure the mechanical parameters of the beam column node test piece under the load by means of a strain gauge, a dial indicator, a displacement sensor, a force sensor or other tools while carrying out the loading, and therefore, the bearing mechanism and the mechanics model can be analyzed and studied. The whole device is clear in construction, convenient to use, and low in cost, and is a novel test device suitable for a miniature light steel beam column node test piece.

Description

A kind of experimental rig that can be used for light steel frame bean column node Experiment of Mechanical Behavior
Technical field
The present invention relates to a kind of experimental rig that can be used for light steel frame bean column node Experiment of Mechanical Behavior, belongs to building work Journey technical field.
Background technology
Recently as people's greatly improving to environmental protection and energy saving, the pay attention to day by day of housing industrialization and China's output of steel, The highest attention that the good structure with assembled lightweight steel of little, short time limit, heat preservation and energy conservation effects causes government and research institution is polluted, Increasing scholar has carried out in-depth study to this structure.Based on light girder steel, the research of the component level of light steel column It is more, and the research of layer of structure is risen to from the research of component level, the stress performance of beam-column connection is most to close The link of key.Beam-column connection is connected to various components in structural system, plays a part of to transmit load, Distributing loads, Therefore the stress performance of bean column node decides in a way the stress performance of total, and the research to bean column node is also The key of light steel frame research.Traditional steel-structure beam-column node Experiment of Mechanical Behavior generally requires the structure in large span Experiment hall is carried out, and needs counter force wall, earth anchor screw rod, large-scale jack and large-tonnage actuator, and lifts test specimen and other items The overhead traveling crane of needs hangs, and experimentation cost is higher, and the cycle is longer.
Compare with high-rise and large span steel structure bean column node test specimen, light steel frame bean column node has that member section is little, lotus The features such as little, displacement is little is carried, if also continuing to use preceding method when its stress performance is studied, not only actuator, jack etc. are filled To put all be difficult to and match completely, and the pitch-row of anchor hole, the pitch-row of counter force wall are all larger, the test to small-size test piece, own The device of fixed test specimen is required for customizing again.The present invention provides one kind and can be used for light steel frame bean column node Experiment of Mechanical Behavior Experimental rig and the practice, to solve the problems such as traditional experiment plant bulk is excessive, experimentation cost is high, site requirements is high.
The content of the invention
It is an object of the invention to provide a kind of experimental rig that can be used for light steel frame bean column node Experiment of Mechanical Behavior And the practice, with solve conventional node experimental rig take up room greatly, high cost, change inconvenient the problems such as.
For achieving the above object, the present invention is adopted the following technical scheme that:
A set of experimental rig that can be used for light steel frame bean column node Experiment of Mechanical Behavior, the device includes device base plate (1), lower bayonet slot (2), upper draw-in groove (3), fastening bolt (4), upper cover plate (5), base plate elongated slot (6), side plate (7), clamping plate (8), hinge Bar (9), beam-column connection test specimen (10), mechanics universal testing machine (11).
Beam-column connection test specimen (10) is T-shaped test specimen, and the upper and lower ends of test specimen are respectively the structure of post, and horizontal direction is The structure of beam.
Mechanics universal testing machine (11) is bolted with device base plate (1), and side plate (7) is vertically welded on device base plate (1) both sides, the upper and lower ends of beam-column connection test specimen (10) are fixed by upper cover plate (5), device base plate (1) respectively, under Draw-in groove (2) is arranged on device base plate (1), and upper draw-in groove (3) is arranged on upper cover plate (5), lower bayonet slot (2) and upper draw-in groove (3) Position is corresponding;The upper and lower ends of beam-column connection test specimen (10) are respectively charged into draw-in groove (3), lower bayonet slot (2), and beam column connects Connect specimen joints (10) to fasten by fastening bolt (4) with lower bayonet slot (2), upper draw-in groove (3);Base plate elongated slot (6) is arranged on device On base plate (1), for changing loading Position.
Clamping plate (8) is arranged at beam-column connection test specimen (10) beam-ends loading, and mechanics universal testing machine (11) is by hinge Bar (9) is connected with clamping plate (8).
The bottom that fixed device base plate (1) is arranged on experimental rig is assembled with universal testing machine, is whole experimental rig The critical component being connected with mechanics universal testing machine (11).Device base plate (1) is made by Q235 steel or Q345 steel, and thickness is 25mm ~35mm, by 5~6 a diameter of 24mm~30mm be bolted to universal testing machine (11) plus on load floor, mechanics examination That tests machine adds load floor thickness 35mm~40mm, with larger rigidity, can bear larger vertical load, the dress being connected thereto Bottom set plate is that side plate (7) and bean column node test specimen (10) provide reliable supporting.
Lower bayonet slot (2) shape of assembling light steel frame post is identical with the column section of the lower end of bean column node test specimen (10), is Be easy to the installation of bean column node test specimen (10) to fix, the size of lower bayonet slot (2) more than lower end column cross-section size, lower bayonet slot (2) 1mm is outwards respectively had more along four sides.In order to avoid causing to damage to the load floor that adds of mechanics universal testing machine (11) during loading, Little 10mm of depth ratio device base plate (1) of lower bayonet slot (2) or so, should be 20mm~25mm, and this depth ensures in loading at present Draw-in groove (2) firmly can play wedge action to the post lower end of bean column node test specimen (10).According to the theory that bean column node is tested Require, after the post lower end of bean column node test specimen (10) is fixed on lower bayonet slot (2), to form a kind of machine being hinged in theory Structure, the lower bayonet slot (2) of the assembling light steel frame post of experimental rig complies fully with the theory calls of test.
Upper draw-in groove (3) shape is identical with end section on the post of bean column node test specimen, for the ease of bean column node test specimen (10) Incline from below and pierce into draw-in groove (3), the size of upper draw-in groove (3) is bigger than post upper end sectional dimension, and four sides of upper draw-in groove (3) are outside Respectively have more 10mm~15mm.The steel plate thickness of upper draw-in groove (3) is identical with the depth of lower bayonet slot (2), it is ensured that bean column node test specimen Upper end, lower end are all in being hinged state.
The fastening bolt (4) one of fixed light steel frame post has eight, and lower bayonet slot (2) place has four, and upper draw-in groove (3) place has Four, fastening bolt (4) is to ensure that the key measure of lower bayonet slot clamping bean column node test specimen (10).Due to machinery processing apparatus When, the gap between bean column node test specimen (10), upper draw-in groove (3), lower bayonet slot (2) is difficult to avoid that, and these gaps are in loading There is horizontal displacement in the styletable up and down that bean column node test specimen (10) can be caused, and the reading of beam end displacement is had influence on then, and this is examination Test not permitted appearance.After bean column node test specimen (10) being fitted into draw-in groove (3), lower bayonet slot (2), upper cover plate is covered (5), bolt enters and is tightened after the fastening bolt (4) of light steel frame post, it is ensured that in loading, and state of the upper and lower styletable in clamping will Probably due to the experimental error that redundant displacement is caused is reduced to Min..
The upper cover plate (5) of fixed light steel frame post is to ensure that the key of axle pressure is fixed and applied in bean column node test specimen upper end Part.Because the size of upper draw-in groove (3) has more 10mm~15mm than the post upper end of bean column node test specimen (10) per side, such as Fig. 2 institutes Show, in the bottom of upper cover plate (5), there is a square square frame shape projection, just occupy the gap of this 10mm~15mm having more, Cover in upper cover plate (5), and upper cover plate is connected with upper draw-in groove (3) with four bolts after, then with four fastening bolts (4) Tighten, the upper end for allowing for bean column node test specimen is limited completely horizontal displacement, and not limit flexion, is met theory and is hinged Mechanical model, reach the requirement of bean column node Experiment of Mechanical Behavior.As shown in Fig. 2 can also install in upper cover plate (5) top Small-size jack or brute spring (20kN~80kN), are that styletable applies axle pressure, simulate what light steel column was operationally waited completely Stress.
Base plate elongated slot (6) for changing loading Position is to change loading when making beam-column connection Experiment of Mechanical Behavior The key Design of point.According to test objective, when needing to study node district flexural property, load(ing) point is needed bean column node test specimen (10) Will be near beam end, during if necessary to research node district ultimate shear capacity, load(ing) point needs to move near bean column node root, section Outside point area, because mechanics universal testing machine (11) cannot be moved, and bean column node test specimen (10) is fixed in test dress Put, whole experimental rig can only be moved to change the position of load(ing) point, this movement will be leaned on for changing load(ing) point position The base plate elongated slot (6) put realizing, the bolt between back-off assembly base plate (1) and mechanics universal testing machine (11) plus load floor, Make whole device slide into design attitude, then tighten bolt, you can realize the change of loading Position.
Connecting bottom board plays the effect of key with the side plate (7) of top board to the globality of experimental rig.Side plate bottom and dress Bottom set plate (1) is welded, and the top board welding that top and upper draw-in groove (3) are located, side plate (7) will have enough rigidity to can guarantee that lower bayonet slot (2) and upper draw-in groove (3) relative position, while side plate (7) will have enough resistance to tensions, when beam-ends is subject to larger pulling force, Bean column node test specimen (10) can pass to top board this pulling force, and top board need side plate haul could guarantee test be normally carried out. The thickness of side plate (7) is according to the size of vertical load from the value between 15mm~25mm.Because process of the test needs connection position The connecting lines such as displacement sensor, strain transducer, force snesor, further need exist for observing the experimental phenomena of node district, so two The hole of triangle has been opened in the little region of stress in individual side plate, as shown in Figure 1.
Clamping plate (8) effect of beam-ends loading is to fix beam-ends, and the load of loading termination is passed to beam-ends, therefore in beam column section Point test specimen (10) installs must being fixed with high-strength bolt up and down for rear plate (8) in place.Be divided into when being loaded due to beam-ends pulling force and Pressure, clamping plate (8) is also just divided into two operating modes:Downwards during loading, train wheel bridge directly acts on beam-ends top surface, the spiral shell between lower plate Bar and lower plate stress are little;When loading upwards, lower plate holds curved scissors effect, and four screw rods bear axial tension.Press from both sides up and down , in 20~25mm, four screw diameters are in 14mm~20mm for the thickness of plate (8).
The toggle (9) of loading termination is the critical component for vertical load being delivered to from loading crossbeam beam-ends.Toggle (9) exists There are two operating modes during loading:Downwards during loading, train wheel bridge (8) is close to and parallel all the time with beam-ends upper surface, herein toggle (9) Rotational angle slowly becomes big also with the increase of beam-ends vertical displacement;When loading upwards, toggle (9) bears larger pulling force, because This should be constantly in exceptionally straight state, i.e., without corner.The axle for being dimensioned to guarantee toggle net area and centre of toggle (9) The maximum pull that can apply of loading crossbeam can be born and guarantee not produce obvious deformation.
Beam-column connection test specimen (10) is designed according to test objective.Light steel column adopts square sectional, and light girder steel can Using square sectional or square-section, I-shaped cross-section, if using I-shaped cross-section, to make test specimen keep in loading It is stable, need the web height at the node district of I-shaped cross-section, load(ing) point that rectangle ribbed stiffener is set.
Mechanics universal testing machine (11) is the charger of the test and measurement, operation instrument.Mechanics used by this device Universal testing machine is double lead series, is made up of measuring system, drive system, control system and computer, with high precision, speed governing Wide ranges, compact conformation, easy to operate, steady performance.
The present invention relates to a kind of experimental rig and the practice that can be used for light steel frame bean column node Experiment of Mechanical Behavior, its tool The body practice is following (as shown in Figure 1):
The first step:Cut out the steel of two pieces of base plates, two blocks of side plates, one piece of top board, one piece of backboard according to design size respectively Plate, required precision is controlled in ± 0.5mm, processes the square groove of top board after cutting on lathe;Mill out square on base plate Groove and five elongated slots;Cut out the vee gutter on two side plates.
Second step:Relative position according to design welds aforesaid each block of steel plate, and under, two blocks of side plates are in for two pieces of base plates Between, upper, backboard has the effect of ribbed stiffener concurrently to top board between base plate, top board and side plate.Weldquality is guaranteed during welding B levels are not less than, each weld width and length will meet existing《Code for design of steel structures》Requirement.Top board and side plate, base plate with Side plate will add small-sized ribbed stiffener, thickness 10mm, high and long size to be less than 50mm.
3rd step:First according to design, device is fixed on mechanics universal testing machine with the bolt of 24~30mm Plus load floor on, adjust front and back position.Then force snesor, connection are installed on the loading crossbeam of mechanics universal testing machine Vertical pivot, toggle, train wheel bridge.
4th step:Beam-column connection test specimen is installed, test specimen is first inclined during installation, by the post upper end of test specimen from upper draw-in groove Pass from bottom to top, then up lifting test specimen, treat the lower bayonet slot that newel post bottom is fallen on base plate under test specimen, then tighten and block up and down Eight fastening bolts in groove, upper cover plate is alignd with upper draw-in groove, covers upper cover plate, sets the equipment for adding axle pressure, uses bolt Upper cover plate is fixed on top board.
5th step:Connection strain transducer, displacement transducer, the various lines of force snesor.Will with train wheel bridge and lower plate Beam-column connection test specimen is clamped.Various sensors are debugged, starts loading and data acquisition.
Compared with prior art, the experimental rig that can be used for light steel frame bean column node Experiment of Mechanical Behavior of the invention, Have the advantage that:
(1) low cost:The present invention is the thick steel plates of 15~35mm comprising new bean column node Experiment of Mechanical Behavior device Make through operations such as cutting, milling, welding, spray paintings, the cost of set of device (does not contain mechanics universal test less than 1500 yuan Machine).And traditional beam-column connection stress performance relies on counter force wall, anchor hole, ground anchor bolt, lateral spacing device, horizontal start The large-scale experiment such as device, crane room equipment, expense is up to more than 5000 yuan.
(2) hardware requirement is not high, easily promotes:Steel-structure beam-column node species at present in engineering is more, many to lack The weary mechanical property research compared with system, and traditional bean column node Experiment of Mechanical Behavior needs the structural test hall that overhead traveling crane hangs With the large-scale experiment equipment such as counter force wall, many colleges and universities and research institution are difficult to.And experimental rig of the present invention can be with Implement test on mechanics universal testing machine, belong to pilot plant unit, be more prone to promote.
(3) load simply, data acquisition is accurate:Loading is controlled using the computer of mechanics universal testing machine, and loading velocity has Many gears, can use dial gauge, stay wire displacement sensor, common displacement sensing with precise control, data acquisition equipment Device, fine data acquisition system etc., the load-displacement curve drawn out is more fine, and test effect is preferable.And it is traditional large-scale Bean column node testing equipment adopts oil pump control, and because load is larger, precision is relatively poor, and data acquiring frequency is relatively low.
(4) it is easy to operate:
Compared with traditional bean column node stress test, this experimental rig small volume is installed, dismantles test specimen, wiring, adopts The workload of the links such as collection, arrangement survey tool decreases, and accelerates the time changed used by part, improves operating efficiency, And the data acquisition achieved by traditional bean column node Experiment of Mechanical Behavior, styletable add the drafting of axle pressure, load-displacement curve Can realize etc. function, be a kind of new and effective experimental rig being worthy to be popularized.
Description of the drawings
Fig. 1 is a kind of schematic perspective view of the experimental rig that can be used for light steel frame bean column node Experiment of Mechanical Behavior;
Fig. 2 can be the schematic perspective view for applying the multifunctional cover plate of axle pressure in capital;
Fig. 3 is the operating diagram one loaded after the experimental rig of the present invention is installed on mechanics universal testing machine
Fig. 4 is the operating diagram loaded after the experimental rig of the present invention is installed on mechanics universal testing machine Two.
In figure:1 and the fixed device base plate of universal testing machine assembling, 2, the lower bayonet slot of assembling light steel frame post, 3, upper card Groove, 4, the fastening bolt of fixed light steel frame post, 5, the upper cover plate of fixed light steel frame post, 6, for changing loading Position Base plate elongated slot, 7, the side plate of connecting bottom board and top board, 8, the clamping plate of beam-ends loading, 9, the toggle of loading termination, 10, beam-to-column joint Specimen joints, 11, mechanics universal testing machine.
Specific embodiment
With reference to specific embodiment, the present invention will be further described.
As shown in figure 1, a kind of experimental rig that can be used for light steel frame bean column node Experiment of Mechanical Behavior, the device includes Fixed device base plate (1), the lower bayonet slot (2) of assembling light steel frame post, upper draw-in groove (3), fixed light is assembled with universal testing machine Upper cover plate (5), the base plate elongated slot for changing loading Position of the fastening bolt (4) of Steel Frame Column, fixed light steel frame post (6), the side plate (7) of connecting bottom board and top board, the clamping plate (8) of beam-ends loading, toggle (9), the beam-column connection of loading termination Test specimen (10), mechanics universal testing machine (11).The experimental rig is by 15~35mm thick steel plate through cutting, milling, welding, spray The operations such as paint are made, Q235 or Q345 steel plates, the machining accuracy of each several part can be adopted to be maintained within ± 0.5mm.Device bottom Plate and mechanics universal testing machine plus should be able to bear together with load floor and do not occur substantially change not less than the vertical pressure of 100kN Shape, side plate should be able to bear do not occur substantially deformation not less than the vertical tension of 100kN.Side plate and base plate, side plate and top board Weld seam should be able to bear the obvious stretcher strain of the unlikely generation not less than the pulling force of 100kN.Device top board should be able to bear bean column node Test specimen upwards not less than 100kN jacking load and the obvious flexural deformation of unlikely generation.According to steel density 7800kg/ m3Estimation, the weight of whole device is about within 200kg.Because the steel of base plate, side plate, top board all have larger thickness (20~35mm) and larger rigidity, and the steel general thickness of the beam column component of light steel frame is only 4~8mm, therefore entirely Experimental provision can more effectively constrain the upper and lower displacement of bean column node test specimen, and the horizontal fastening bolt on upper lower bayonet slot and draw-in groove The horizontal displacement of bean column node test specimen can be preferably constrained again, and whole constraint meets bean column node Experiment of Mechanical Behavior needs " upper and lower limit levels and vertical displacement, be hinged, not limit flexion, plus axle pressure " etc. mechanical condition;And omnipotent mechanics machine The loading crossbeam load being exerted by beam-ends that pumps can meet bean column node Experiment of Mechanical Behavior needs again " horizontal cyclic loading exteriment loading " Protonation constant;After test specimen installation is in place, can be in the toggle upper end installing force of loading termination Sensor can arrange strain measuring numerical value and the change of the vertical force for being added in bean column node test specimen beam-ends in real time on test specimen The instruments such as piece, dial gauge, displacement transducer measuring deformation of the bean column node test specimen under load, so as to show that bean column node is tried The actual parameter of the stress performance of part, is analyzed to it, studies, and studies its force-mechanism and mechanical model, is bean column node The design and application of pattern provides foundation.
Be more than the present invention an exemplary embodiments, the present invention enforcement not limited to this.

Claims (10)

1. a kind of experimental rig for light steel frame bean column node Experiment of Mechanical Behavior, it is characterised in that:The device includes dress Bottom set plate (1), lower bayonet slot (2), upper draw-in groove (3), fastening bolt (4), upper cover plate (5), base plate elongated slot (6), side plate (7), clamping plate (8), toggle (9), beam-column connection test specimen (10), mechanics universal testing machine (11);
Beam-column connection test specimen (10) is T-shaped test specimen, and the upper and lower ends of test specimen are respectively the structure of post, and horizontal direction is beam Structure;
Mechanics universal testing machine (11) is bolted with device base plate (1), and side plate (7) is vertically welded on device base plate (1) Both sides, the upper and lower ends of beam-column connection test specimen (10) are fixed by upper cover plate (5), device base plate (1) respectively, lower bayonet slot (2) it is arranged on device base plate (1), upper draw-in groove (3) is arranged on upper cover plate (5), the position of lower bayonet slot (2) and upper draw-in groove (3) It is corresponding;The upper and lower ends of beam-column connection test specimen (10) are respectively charged into draw-in groove (3), lower bayonet slot (2), beam-to-column joint section Point test specimen (10) is fastened with lower bayonet slot (2), upper draw-in groove (3) by fastening bolt (4);Base plate elongated slot (6) is arranged on device base plate (1) on, for changing loading Position;
Clamping plate (8) is arranged at beam-column connection test specimen (10) beam-ends loading, and mechanics universal testing machine (11) is by toggle (9) It is connected with clamping plate (8).
2. a kind of experimental rig for light steel frame bean column node Experiment of Mechanical Behavior according to claim 1, it is special Levy and be:Assemble the bottom that fixed device base plate (1) is arranged on experimental rig with universal testing machine, be whole experimental rig with The critical component of mechanics universal testing machine (11) connection;Device base plate (1) is made by Q235 steel or Q345 steel, thickness be 25mm~ 35mm, by 5~6 a diameter of 24mm~30mm be bolted to universal testing machine (11) plus on load floor, mechanical test Machine plus load floor thickness 35mm~40mm, with larger rigidity, larger vertical load can be born, the device being connected thereto Base plate is that side plate (7) and bean column node test specimen (10) provide reliable supporting.
3. a kind of experimental rig for light steel frame bean column node Experiment of Mechanical Behavior according to claim 1, it is special Levy and be:Lower bayonet slot (2) shape of assembling light steel frame post is identical with the column section of the lower end of bean column node test specimen (10), in order to The installation for being easy to bean column node test specimen (10) is fixed, and the size of lower bayonet slot (2) is more than the column cross-section size of lower end, lower bayonet slot (2) 1mm is outwards respectively had more along four sides;The little 10mm of depth ratio device base plate (1) of lower bayonet slot (2).
4. a kind of experimental rig for light steel frame bean column node Experiment of Mechanical Behavior according to claim 1, it is special Levy and be:Upper draw-in groove (3) shape is identical with end section on the post of bean column node test specimen, for the ease of bean column node test specimen (10) from Inclined downward pierces into draw-in groove (3), and the size of upper draw-in groove (3) is bigger than post upper end sectional dimension, and four sides of upper draw-in groove (3) are outwards each Have more 10mm~15mm;The steel plate thickness of upper draw-in groove (3) is identical with the depth of lower bayonet slot (2), it is ensured that bean column node test specimen it is upper End, lower end are all in being hinged state.
5. a kind of experimental rig for light steel frame bean column node Experiment of Mechanical Behavior according to claim 1, it is special Levy and be:The fastening bolt (4) one of fixed light steel frame post has eight, and lower bayonet slot (2) place has four, and upper draw-in groove (3) place has Four, fastening bolt (4) is to ensure that the key measure of lower bayonet slot clamping bean column node test specimen (10);Due to machinery processing apparatus When, the gap between bean column node test specimen (10), upper draw-in groove (3), lower bayonet slot (2) is difficult to avoid that, and these gaps are in loading There is horizontal displacement in the styletable up and down that bean column node test specimen (10) can be caused, and the reading of beam end displacement is had influence on then;Beam After Column border node test specimen (10) is fitted into draw-in groove (3), lower bayonet slot (2), upper cover plate (5) is covered, bolt enters the fastening of light steel frame post Bolt is tightened after (4), it is ensured that in loading, state of the upper and lower styletable in clamping.
6. a kind of experimental rig for light steel frame bean column node Experiment of Mechanical Behavior according to claim 1, it is special Levy and be:The upper cover plate (5) of fixed light steel frame post is to ensure that the key of axle pressure is fixed and applied in bean column node test specimen upper end Part;Because the size of upper draw-in groove (3) has more 10mm~15mm than the post upper end of bean column node test specimen (10) per side, in upper cover plate (5), there is a square square frame shape projection bottom, the gap of this 10mm~15mm having more just is occupied, in upper cover plate (5) Cover, and upper cover plate is connected with upper draw-in groove (3) with four bolts after, then tightened with four fastening bolts (4), allow for The upper end of bean column node test specimen is limited completely horizontal displacement, and not limit flexion, meets the mechanical model that theory is hinged, Reach the requirement of bean column node Experiment of Mechanical Behavior;Small-size jack or brute spring can also be installed in upper cover plate (5) top, Apply axle pressure for styletable, the stress that light steel column is operationally waited is simulated completely.
7. a kind of experimental rig for light steel frame bean column node Experiment of Mechanical Behavior according to claim 1, it is special Levy and be:Base plate elongated slot (6) for changing loading Position is to change loading when making beam-column connection Experiment of Mechanical Behavior The key Design of point;According to test objective, when needing to study node district flexural property, load(ing) point is needed bean column node test specimen (10) Will be near beam end, during if necessary to research node district ultimate shear capacity, load(ing) point needs to move near bean column node root, section Outside point area, because mechanics universal testing machine (11) cannot be moved, and bean column node test specimen (10) is fixed in test dress Put, whole experimental rig can only be moved to change the position of load(ing) point, this movement will be leaned on for changing load(ing) point position The base plate elongated slot (6) put realizing, the bolt between back-off assembly base plate (1) and mechanics universal testing machine (11) plus load floor, Make whole device slide into design attitude, then tighten bolt, that is, realize the change of loading Position.
8. a kind of experimental rig for light steel frame bean column node Experiment of Mechanical Behavior according to claim 1, it is special Levy and be:Connecting bottom board plays the effect of key with the side plate (7) of top board to the globality of experimental rig;Side plate bottom and device Base plate (1) is welded, and the top board welding that top and upper draw-in groove (3) are located, side plate (7) will have enough rigidity to can guarantee that lower bayonet slot (2) and upper draw-in groove (3) relative position, while side plate (7) will have enough resistance to tensions, when beam-ends is subject to larger pulling force, Bean column node test specimen (10) can pass to top board this pulling force, and top board need side plate haul could guarantee test be normally carried out; The thickness of side plate (7) is according to the size of vertical load from the value between 15mm~25mm.
9. a kind of experimental rig for light steel frame bean column node Experiment of Mechanical Behavior according to claim 1, it is special Levy and be:Clamping plate (8) effect of beam-ends loading is to fix beam-ends, and the load of loading termination is passed to beam-ends, therefore in beam column section Point test specimen (10) installs must being fixed with high-strength bolt up and down for rear plate (8) in place;Be divided into when being loaded due to beam-ends pulling force and Pressure, clamping plate (8) is divided into two operating modes:Downwards during loading, train wheel bridge directly acts on beam-ends top surface, the screw rod between lower plate with And lower plate stress is little;When loading upwards, lower plate holds curved scissors effect, and four screw rods bear axial tension;Upper lower plate (8) Thickness in 20~25mm, four screw diameters are in 14mm~20mm;
The toggle (9) of loading termination is the critical component for vertical load being delivered to from loading crossbeam beam-ends;Toggle (9) is in loading When have two operating modes:Downwards during loading, train wheel bridge (8) is close to and parallel all the time with beam-ends upper surface, herein the rotation of toggle (9) Angle slowly becomes big also with the increase of beam-ends vertical displacement;When loading upwards, toggle (9) bears larger pulling force, therefore should This is constantly in exceptionally straight state, i.e., without corner;Being dimensioned to of toggle (9) ensures that the axle of toggle net area and centre can hold By the maximum pull that can apply of loading crossbeam and guarantee not produce obvious deformation;
Beam-column connection test specimen (10) is designed according to test objective;Light steel column adopts square sectional, and light girder steel is using just Square-section or square-section, I-shaped cross-section, if using I-shaped cross-section, to make test specimen keep stable in loading, Need the web height at the node district of I-shaped cross-section, load(ing) point that rectangle ribbed stiffener is set.
10. a kind of experimental rig for light steel frame bean column node Experiment of Mechanical Behavior according to claim 1, it is special Levy and be:The implementation process of the device is as follows,
The first step:Cut out the steel plate of two pieces of base plates, two blocks of side plates, one piece of top board, one piece of backboard, essence according to design size respectively Degree requires that control, in ± 0.5mm, processes the square groove of top board on lathe after cutting;Mill out square groove on base plate and Five elongated slots;Cut out the vee gutter on two side plates;
Second step:Relative position according to design welds aforesaid each block of steel plate, two pieces of base plates under, two blocks of side plates in centre, Upper, backboard has the effect of ribbed stiffener concurrently to top board between base plate, top board and side plate;To guarantee that weldquality is not low during welding In B levels, each weld width and length will meet existing《Code for design of steel structures》Requirement;Top board and side plate, base plate and side plate Small-sized ribbed stiffener, thickness 10mm, high and long size is added to be less than 50mm;
3rd step:First according to design, device is fixed on adding for mechanics universal testing machine with the bolt of 24~30mm On load floor, front and back position is adjusted;Then force snesor, connection are installed on the loading crossbeam of mechanics universal testing machine to erect Axle, toggle, train wheel bridge;
4th step:Install beam-column connection test specimen, test specimen is first inclined during installation, by the post upper end of test specimen from upper draw-in groove under And on pass, then up lifting test specimen, treats the lower bayonet slot that newel post bottom is fallen on base plate under test specimen, then tightens in lower bayonet slot Eight fastening bolts, upper cover plate is alignd with upper draw-in groove, cover upper cover plate, set plus axle pressure equipment, will be upper with bolt Cover plate is fixed on top board;
5th step:Connection strain transducer, displacement transducer, the various lines of force snesor;With train wheel bridge and lower plate by beam column Connecting node test specimen is clamped;Various sensors are debugged, starts loading and data acquisition.
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CN110748011B (en) * 2019-10-31 2020-07-14 北京天邦巨成科技有限公司 Supporting node of crossbeam
CN111477091A (en) * 2020-05-06 2020-07-31 淮阴工学院 Many confined structure roof beam loading experiment platform

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