CN107764492B - A kind of model test method and system of research framework structural vibration response feature - Google Patents
A kind of model test method and system of research framework structural vibration response feature Download PDFInfo
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Abstract
A kind of model test method and system of research framework structural vibration response feature, method is the following steps are included: 1) modelling；2) model loads: being divided into two parts: 1. model initial stress state and boundary condition；2. model structure is loaded in different analog vibration loads；3) shaking table model process monitoring: acceleration monitoring and ess-strain monitoring have been carried out respectively.System includes modelling system, model loading system and model assay system: modelling system includes structural concrete and reinforcing bar analog material, model structure and bottom slab concreting；Model loading system includes the fixation device of structure, vibration simulation load bringing device；Model assay system includes acceleration monitoring unit and ess-strain monitoring unit.The present invention solves the problems, such as that frame models production is complicated；Develop feasible model assay systems；It objective can directly reflect enlarge-effect of the frame structure under effect of vibration and load parameter to the affecting laws of structure.
Description
Technical field
The present invention relates to frame structure shake table physical experiments fields, and in particular to a kind of research framework structural vibration
The model test method and system of response characteristic.
Background technique
In recent years, with the rapid development of frame structure, response characteristic and texturing machine of the building structure under effect of vibration
The research of reason is increasingly valued by people.Naturally seismic wave is because its frequency is low, decaying is slow, the duration is long and carries energy
Huge feature is easy to generate harm to buildings or structures, and with the high speed development of urban construction, blast working is in engineering
Extensive use in construction, the blasting vibration wave generated in work progress can also have an impact buildings or structures around, it is seen that
The vibratory response feature for researching and analysing frame structure is very necessary, can be provided for blasting vibration control and seismic design of structures according to
According to.
Three kinds of methods are mainly used for the research of the response characteristic analysis of effect of vibration frame structures under action at present: being tried at scene
It tests, numerical simulation and physical experiments.Field test is disadvantageous in that the test period is long, and experimentation cost is high, and very
Difficulty finds two identical experimental conditions；Using method for numerical simulation the problem is that since frame structure is in vibration work
With the complexity of lower deformation, the reliability of numerical simulation result often it is difficult to ensure that；And shake table physical experiments are being analyzed
Whether structure design rationally and in terms of the stability of evaluation structure has the function of can not be substituted, compared to using Numerical-Mode
Quasi- technology, shaketalle test have can intuitive reaction structure deformation and failure process, actual can more reflect various physics
Phenomenon and rule.
Vibration load is carried out to model framework structure by shake table physical experiments vibrating with research framework structure
The strain characteristics of the accelerometer of each layer reveals under effect elevation amplification effect and structural key component, and added by changing
Each influence of the load parameter to structure of parameter (intensity, frequency, duration) research for carrying vibration, to the monitoring data of acquisition into
The binding analysis of row qualitatively and quantitatively, has important theoretical and practical significance.
Summary of the invention
The technical problem to be solved by the present invention is to In view of the above shortcomings of the prior art, provide a kind of research framework
The model test method and system of structural vibration response feature.
Used technical solution is the present invention to solve above-mentioned technical problem:
A kind of model test method of research framework structural vibration response feature, comprising the following steps:
S1, modelling: response pattern of the reasonable generalization frame structure under effect of vibration, according to physical experiments phase
Reinforcing bar analog material and concrete analog material in frame structure are determined like theory, and consider that the reality of shaking table model can
Operability, comprising: vibration table surface size, shake table bearing capacity, modelling complexity obtain test related physical quantity
The likelihood ratio, then using a reinforced concrete structure as prototype carry out the production of small scale scaled model, consider existing test
The limitation of condition and the purpose of experimental study mainly comprising the production of structural beams, column, plate during modelling, and are neglected
The slightly production of structural shear wall and other structures, obtains physical test model by modelling；
S2, model load: it is divided into two parts: (1) model initial stress state and boundary condition: in order to make up in test
The deficiency of model structure gravitational effect is evenly arranged brick on the every floor of model and serves as additional labor quality, in addition, in order to make
Model structure and prototype structure boundary condition having the same, production bottom plate are fixedly connected with model structure bottom with shake table,
Guarantee that model structure and shake table vibrate jointly when carrying out vibration test；(2) model is loaded in different analog vibration loads:
Frequency, the intensity, duration for changing load vibration wave during test by the control system of shake table study each load ginseng
The affecting laws of several pairs of model structures；
S3, shaking table model process monitoring: when carrying out shaking table model, reasonable point layout can be more preferable
The changing rule for reflecting each measurement parameters of model structure, arrange and acceleration monitoring point and answer on each layer of model structure
Stress-strain monitoring point adds each acceleration monitoring of model structure point and ess-strain monitoring point in vibration loading procedure
Speed monitoring and ess-strain monitoring, and record the acceleration change value of each acceleration monitoring point and answering for each stress monitoring point
Stress-strain value, with the acceleration and ess-strain feature of research model structure each layer under different vibration loading effects.
According to the above scheme, the production process of the model specifically includes following process:
A, go out the design drawing that pours of model structure according to the Prototype Design of selection, and indicate in model structure on the diagram
The size of the beam of the arrangement of reinforcement of each member reinforcing steel bar analog material and each layer of model, column, floor；
B, according to the size for pouring the model structure required in design drawing of model structure, make baffle with veneer, calculate
The length and width of every layer of baffle when model pours out, veneer, size is cut into around one piece of bottom surface baffle and six groups as requested
Baffle, and be numbered；
C, the packing material in model casting process is served as with foam block, the cuboid foam block set in advance, according to mould
The beam of type structure, column, floor size cut, the rest and Model Beam of the foam after making cutting, column, floor ruler
It is very little identical；
D, when pouring a tier model architecture, bottom plate is fixed with surrounding baffle with adhesive tape, is put into the foam block of well cutting simultaneously
It is fixed, beam, column, plate arrangement of reinforcement iron wire and wire netting are carried out according to the structural reinforcement dosage that bending resistance equivalence principle is calculated
Bind work, then according to formula ratio carry out concrete analog material proportion and stirring work, it is to be mixed uniformly after pour into system
In the mold performed, is poured after one layer and complete that next layer can be started after material solidifies completely to pour work；
E, it after the completion of each layer all pours, places, is removed after overall model structure solidifies completely under field conditions (factors)
Surrounding formwork is carefully dug out intermediate foam block, and is suitably modified, and whether inspection model structure meets wanting for the likelihood ratio
It asks, obtains the physical test model for research framework structural vibration response feature of test if meeting.
According to the above scheme, the production process of the step S2 insole board specifically includes following process:
A, go out the design drawing that pours of floor structure according to the size of model structure and vibration table surface size design, and scheming
On indicate the size of floor structure, the size and location of bottom plate fixed hole position, bottom plate and model structure connection hole location size and
Position；
B, according to the size for pouring the floor structure required in design drawing of floor structure, veneer is cut into one piece of bottom
Baffle around face bottom plate and 6 groups, blend compounds band are successively fixed as entirety, are used as the mold poured；
C, size and the position of hole location are connect according to the fixed hole position of floor structure poured in design drawing and with model structure
It sets, packing material is cut into correspondingly sized and fixed corresponding position in a mold, is poured uniform cast material is matched
In a mold, surrounding baffle is removed after the cast material wait pour solidifies completely and hole location filler obtains bottom plate.
According to the above scheme, model structure simulation different from the fixation of shake table, the load of additional load and progress
The concrete operations process that oscillatory load applies are as follows:
A, be fixedly connected with model structure bottom with shake table by the bottom plate made, first by bolt make bottom plate with
Then shake table fixation is placed on the rod structure of model structure bottom in the reserved hole location of bottom plate, pours at gap
Binding material makes model structure bottom be fixed as an entirety by bottom plate and shake table；
B, (additional labor quality as much as possible is arranged in model structure with this in the method for using deficient manual quality's model
To supply the deficiency of gravitational effect and the inertia effect as far as possible), it is calculated according to the principle of equivalent density reasonable additional total
Then quality is evenly arranged on each floor of model structure, additional labor quality is arranged in the center of floor, and by viscous
Knot material fixes additional labor quality mutually with model structure；
C, change frequency, the intensity, duration of load vibration wave by the control system of shake table during the test,
Carry out vibration load according to each group load parameter set, by compare identical rate of loading difference loading frequency and it is identical plus
The response characteristic research rate of loading of carrier frequency rate difference rate of loading drag structure and frequency to the affecting laws of model structure,
By carrying out the time decomposition research load duration to the affecting laws of model structure to acceleration-time curve.
According to the above scheme, the acceleration monitoring point in the step S3 is monitored by accelerometer, since data are received
It is limited to collect channel, accelerometer is set to 0,2,4,6 layer of left and right sides of model structure and (had both had studied each layer of model structure in this way to accelerate
The changing rule of degree, and whether demonstrate the anti-side rigidity at left and right sides of model structure uniform), accelerometer is placed in each monitoring
The same position of floor, placement direction are consistent with the direction of vibration of shake table, and make accelerometer and mould by binding material
Type structure is mutually fixed.
According to the above scheme, the ess-strain monitoring point in the step S3 is monitored by foil gauge, foil gauge monitoring
Point is set on the beam and column of model structure, and the ess-strain monitoring site on column is in the ess-strain monitoring on the bottom of column, beam
Point is located at the left end of beam, and the ess-strain with research model structure in effect of vibration flowering structure key member beam, column changes.
The present invention also provides a kind of model assay systems of research framework structural vibration response feature, including modelling
System, model loading system and model assay system:
The modelling system is used to make model structure and make the floor structure of fixed model, including Mold Making
Equipment, reinforcing bar analog material, concrete analog material, model pour packing material；The Mold Making equipment includes for pouring
The Mold Making equipment of model structure and the Mold Making equipment for pouring bottom plate are built, it is described for pouring the mould of model structure
Tool making apparatus mainly carries out veneer by the size of design to be cut into baffle around one piece of first bottom plate and 6 groups；The use
It is mainly kept off by veneer being cut to size into around one piece of second bottom plate and 4 pieces in the Mold Making equipment for pouring bottom plate
Plate；The reinforcing bar analog material is the galvanized wire of the fixation specification determined according to bending resistance equivalence principle；The concrete
Analog material is the gypsum material of the suitable water paste ratio obtained according to the theory of similarity and uniaxial compressive test；The model, which pours, to be filled out
Filling material is the foam block after shearing；
The model loading system includes the fixed device of model structure and vibration simulation load bringing device: the model knot
The fixed device of structure is used to the bottom plate being fabricated to be bolted on shake table with fixed model structure；The vibration mould
Quasi- load bringing device carries out the load work of vibrational waveform using shake table, and shake table includes table top and basis, high pressure fuel source
And pipe-line system, electro-hydraulic servo actuator, analog control system, computer control system and corresponding data acquisition process system
System；
Acceleration change and knot of the model assay system for each layer of model structure in monitoring vibration loading procedure
The ess-strain of structure key member, including acceleration monitoring unit, ess-strain monitoring unit and strain data vasculum；It is described
Acceleration monitoring unit carries out record and the analysis of data using strain data vasculum, and the acceleration monitoring unit is piezoelectricity
Formula accelerometer is placed in the corner of each layer of model structure, and the data acquisition device shares 16 data collection channels, in conjunction with
Matched signal testing analysis system records and analyzes monitoring data, and piezoelectric accelerometer is connect with data acquisition device,
Data acquisition device is connect by data line with computer；The ess-strain monitoring unit carries out data using strain data vasculum
Record and analysis, the ess-strain monitoring unit be concrete strain piece, the concrete strain piece be set to model structure
At the left end of each layer key member beam and suspension column, bond foil gauge and model structure by glue, same concrete strain piece
It is connect in such a way that data acquisition line is using bridge joint with data acquisition device.
According to the above scheme, first base plate size poured for model structure model is 300mm × 300mm, often
The interior bulk of group surrounding baffle composition is 300mm × 300mm × 150mm.
According to the above scheme, the size of described second bottom plate fixed for model structure and shake table be 500mm ×
500mm, the interior bulk of four pieces of surrounding baffles composition are 500mm × 500mm × 10mm, four fixations in the middle part of insole board
The size of hole location is 30mm × 30mm × 10mm.
According to the above scheme, the foam block is cut according to the size of model structure beam, column.
Compared with prior art, the invention has the following beneficial effects:
(1) by modelling system, especially in terms of frame model structure fabrication, using in the vacant of each layer structure
The foam block of predetermined size of part well cutting makees filler, make when pouring each layer beam of model structure, column, plate one at
Type, the mode that foam block is dug out after model coagulation forming obtain model structure, the intensity for the model structure that this method obtains, bullet
The physical parameters such as mould meet likelihood ratio requirement, and modelling is convenient, low in cost, strong operability, are later similar
The production of small scale frame model, which provides, instructs thinking.
(2) by carrying out Simplified analysis to test prototype, the physical test model of rational proportion ruler is established, vibration is overcome
The actual conditions such as dynamic platform bearing capacity is insufficient, test model is oversized；It is loaded in shake table load using sine wave,
Greatly realize the principle of controlling test unitary variant, change in the course of the research the frequency of load sine wave, intensity,
Duration parameters, to analyzing and researching, each load factor has very important significance to the affecting laws of frame structure.
(3) main measuring content of model test is the acceleration and structural beams, the ess-strain value of column of layers,
When being monitored to structure while the deformation failure situation of model structure entirety is observed and recorded, by the Acceleration time course measured
Curve is analyzed, and the layer inertia force variation characteristic and change in displacement feature of layers, generally research contents system are also obtained
System is abundant, research method is simple and convenient, result of study is accurate and reliable.
Detailed description of the invention
Die structure dwg when Fig. 1 pours for one layer of model structure of the present invention；
Fig. 2 is the structural schematic diagram of bottom plate of the present invention；
Fig. 3 is the structural schematic diagram of test model structure monitoring point of the present invention distribution；
Fig. 4 is the acceleration responsive packet of the identical loading frequency difference rate of loading drag layers of the embodiment of the present invention
Network figure；
Fig. 5 is the strain variation rule of difference of embodiment of the present invention rate of loading drag structural key component；
In figure, the first bottom plate of 1-, baffle around 2-, 3- foam block, 4- screw hole, the connecting hole of 5- and frame structure.
Specific embodiment
Technical solution of the present invention is further described in detail below with reference to embodiment and attached drawing.
Shown in referring to Fig.1~Fig. 3, the model assay systems of research framework structural vibration response feature of the present invention,
Including modelling system, model loading system and model assay system:
Modelling system is used to make model structure and makes the floor structure of fixed model, including Mold Making is set
Standby, reinforcing bar analog material, concrete analog material, model pour packing material；Mold Making for pouring model structure is set
It is standby, mainly veneer is carried out by the size of design to be cut into baffle around one piece of first bottom plate and 6 groups, wherein the first bottom plate ruler
Very little is 300mm × 300mm, and the interior bulk of baffle composition is 300mm × 300mm × 150mm around every group, by adhesive tape,
One layer of baffle of model structure and bottom plate are fixed as entirety by glue；For pouring the Mold Making equipment of bottom plate mainly by thin
One piece of second bottom plate and 4 pieces of surrounding baffles is cut to size into plank, wherein the second base plate size be 500mm × 500mm, four pieces
The interior bulk of surrounding baffle composition is 500mm × 500mm × 10mm, and is fixed by adhesive tape and glue；The similar material of reinforcing bar
Material is the galvanized wire of the fixation specification determined according to bending resistance equivalence principle, is turned according to the area of reinforcement of model structure beam column
Change formula, calculate model test central sill, column the area of reinforcement, and with this obtain Model Beam arrangement of reinforcement select #20 galvanized iron
Silk, the arrangement of reinforcement of column select the galvanized wire of #18, the reinforcing bar arrangement of reinforcement in floor are simulated, since test is mainly to structure mould
Beam, column in type are studied, and for the operability of test, replace matching in floor with wire netting during modelling
Muscle；It is 0.6:1,0.8:1,1:1 to three groups of water paste ratios that concrete analog material, which is according to the theory of similarity and uniaxial compressive test,
Gypsum material carries out optimum selecting, considers the intensity of material, density, plays mould and production difficulty, selects water paste ratio for 0.8:1's
Gypsum material；Model pour packing material be shearing after foam block, wherein for frame structure production packing material be
On the basis of 300mm × 300mm × 145mm foam block, the foam for going Model Beam, the size of column to obtain is cut
Block.
Model loading system includes the fixed device of model structure and vibration simulation load bringing device:
It is 5mm by 4 diameters that the fixed device of model structure, which is used for the floor structure being fabricated to, the screw of a height of 10mm
Hole location is fixed on a vibration table, and one layer of foundation of model framework structure is then put into 4 reserved on bottom plate having a size of 30mm
In the connection hole location of × 30mm × 10mm, gap, which pours gypsum material, between the two makes model structure be connected firmly with floor structure；
Vibration simulation load bringing device carries out the load work of vibrational waveform using shake table, and shake table includes table top and basis, height
At pressure oil source and pipe-line system, electro-hydraulic servo actuator, analog control system, computer control system and corresponding data acquisition
Reason system.
Acceleration change and structure of the model assay system for each layer of model structure in monitoring vibration loading procedure are closed
The ess-strain of key component, including acceleration monitoring unit, ess-strain monitoring unit and strain data vasculum；
Acceleration monitoring unit uses DH5956 strain measurement system, and strain measurement system includes acceleration transducer sum number
According to vasculum, acceleration transducer is piezoelectric accelerometer, set on the corner of model framework layers, data acquisition device
16 data collection channels are shared, monitoring data are recorded and analyzed in conjunction with matched signal testing analysis system, piezoelectric type
Accelerometer is connect with data acquisition device, and data acquisition device is connect by data line with computer；
Ess-strain monitoring unit includes concrete resistance foil gauge and DH5956 data acquisition device, and foil gauge is set to model
At the left end of layers key member beam and suspension column, bond foil gauge and model structure by glue, same foil gauge is logical
Data acquisition line is crossed to connect by the way of bridge joint with data acquisition device.
By taking the high reinforced concrete structure prototype of six floor as an example, the test of shake table frame models, this hair are carried out
The small scale model test method of bright six story frame structure vibratory response feature of embodiment research, comprising the following steps:
S1, modelling: response pattern of the reasonable generalization frame structure under effect of vibration, according to physical experiments phase
Reinforcing bar analog material and concrete analog material in frame structure are determined like theory, and consider that the reality of model test can operate
Property, comprising: vibration table surface size, shake table bearing capacity, modelling complexity etc. obtain test related physical quantity
Then the likelihood ratio carries out the production of small scale scaled model by prototype of the high separate room reinforced concrete structure of six floor, examines
Consider the limitation of existing experimental condition and the purpose of experimental study, mainly includes structural beams, column, plate during modelling
Production, and have ignored the other structures such as structural shear wall；In pouring frame one layer model of structure, it is put into well cutting in a mold
Foam block and fixation, then carry out the gypsum that beam, column, the binding of plate arrangement of reinforcement iron wire and wire netting and water paste ratio are 0.8:1
The proportion of material and stirring work, it is to be mixed uniformly after pour into the mold made, pour that complete material completely solidifying to one layer
Gu the work that pours that can start next layer after, successively pours from bottom to up；
S2, model load: it is divided into two parts: (1) model initial stress state and boundary condition: in order to make up in test
The deficiency of model structure gravitational effect, placement quality is each about 2.7kg brick and serves as additional labor quality on the every floor of model,
In addition, in order to make model structure and prototype structure boundary condition having the same, production bottom plate makes model structure bottom and vibration
Platform is fixedly connected, and guarantees that model structure and shake table vibrate jointly when carrying out vibration test；(2) model structure is in different simulations
Oscillatory load load: it during the test by the control system of shake table, chooses load sine wave and carrys out analog vibration wave, consider
To the affinity constant of model test frequency and the operating frequency range of shake table, tri- groups of loads of 30Hz, 50Hz, 70Hz are chosen in test
Frequency is tested.In order to analyze influence of the rate of loading to model structure, test discovery is carried out to shake table before the test and is worked as
Response error is larger when rate of loading reaches 0.9g, and test rate of loading is chosen for 0.1g, 0.3g, 0.5g, 0.7g, loads
Duration is 180s.Acceleration responsive envelope diagram such as Fig. 4 institute of each layer of identical loading frequency difference rate of loading flowering structure
Show, by the response characteristic for comparing identical rate of loading difference loading frequency and identical loading frequency difference rate of loading flowering structure
Rate of loading and frequency can be studied to the affecting laws of structure, carrying out time decomposition by the time-history curves to monitoring measured value can
To study affecting laws when load is held to structure；The strain variation rule of different rate of loading flowering structures is as shown in Figure 5；
S3, shaking table test process monitoring: when carrying out shake table structural model test, reasonable point layout can be more
The good changing rule for reflecting each measurement parameters of frame structure, arranged on each layer of model structure acceleration monitoring point and
Ess-strain monitoring point, wherein respectively arranging piezoelectric accelerometer 4 at the bottom plate of model structure and 2,4,6 layers or so column angles
It is a, totally 8,6 foil gauges are additionally arranged at every layer of column root, in the left end lateral arrangement 3 of 1,3,6 layer of beam
A foil gauge；In vibration loading procedure, acceleration monitoring is carried out to each acceleration monitoring of structure point and ess-strain monitoring point
It is monitored with ess-strain, and records the acceleration change value of each acceleration monitoring point and the ess-strain of each stress monitoring point
Furthermore value is passed through with the acceleration and ess-strain feature of research model frame structure each layer under different vibration loading effects
The acceleration-time curve measured is analyzed, the layer inertia force and dynamic respond of layers can also be obtained.
Above-described is only presently preferred embodiments of the present invention, cannot limit the right model of the present invention with this certainly
It encloses, therefore uses method same or similar with this example, or according to equivalence changes made by scope of the present invention patent, still belong to this hair
Bright protection scope.
Claims (9)
1. a kind of model test method of research framework structural vibration response feature, which comprises the following steps:
1) modelling: response pattern of the reasonable generalization frame structure under effect of vibration, according to the similar reason of physical experiments
By reinforcing bar analog material and concrete analog material in determining frame structure, and consider that the reality of shaking table model can operate
Property, comprising: vibration table surface size, shake table bearing capacity, modelling complexity obtain the phase of test related physical quantity
Like than then carrying out the production of small scale scaled model by prototype of a reinforced concrete structure, considering existing experimental condition
Limitation and experimental study purpose, mainly include the production of structural beams, column, plate during modelling, and ignore knot
The production of structure shear wall and other structures obtains physical test model by modelling；
The production process of model specifically includes following process:
A, go out the design drawing that pours of model structure according to the Prototype Design of selection, and indicate each structure in model structure on the diagram
The size of the beam of the arrangement of reinforcement of part reinforcing bar analog material and each layer of model, column, floor；
B, according to the size for pouring the model structure required in design drawing of model structure, make baffle with veneer, calculate depanning
The length and width of every layer of baffle when type pours, veneer, size is cut into around one piece of bottom surface baffle and six groups and keeps off as requested
Plate, and be numbered；
C, the packing material in model casting process is served as with foam block, the cuboid foam block set in advance, according to model knot
The beam of structure, column, floor size cut, the rest and the size phase of Model Beam, column, floor of the foam after making cutting
Together；
D, when pouring a tier model architecture, bottom plate is fixed with surrounding baffle with adhesive tape, is put into the foam block of well cutting and fixation,
The binding of beam, column, plate arrangement of reinforcement iron wire and wire netting is carried out according to the structural reinforcement dosage that bending resistance equivalence principle is calculated
Work, then carries out the proportion and stirring work of concrete analog material according to formula ratio, it is to be mixed uniformly after pour into and make
Mold in, poured after one layer and complete that next layer can be started after material solidifies completely to pour work；
E, it after the completion of each layer all pours, places under field conditions (factors), surrounding is removed after overall model structure solidifies completely
Template is carefully dug out intermediate foam block, and is suitably modified, and whether inspection model structure meets the requirement of the likelihood ratio, if
Meet and obtains the physical test model for research framework structural vibration response feature of test；
2) model loads: being divided into two parts: (1) model initial stress state and boundary condition: in order to make up model in test
The deficiency of structure gravitational effect is evenly arranged brick on the every floor of model and serves as additional labor quality, in addition, in order to make model
Structure and prototype structure boundary condition having the same, production bottom plate are fixedly connected with model structure bottom with shake table, guarantee
When carrying out vibration test, model structure and shake table vibrate jointly；(2) model is loaded in different analog vibration loads: being tested
Frequency, the intensity, duration for changing load vibration wave by the control system of shake table in the process, study each load parameter pair
The affecting laws of model structure；
3) shaking table model process monitoring: when carrying out shaking table model, reasonable point layout can be preferably anti-
The changing rule that each measurement parameters of model structure should be gone out, arranges acceleration monitoring point on each layer of model structure and stress is answered
Become monitoring point, in vibration loading procedure, acceleration is carried out to each acceleration monitoring of model structure point and ess-strain monitoring point
Monitoring and ess-strain monitoring, and record the acceleration change value of each acceleration monitoring point and the stress of each stress monitoring point is answered
Variate, with the acceleration and ess-strain feature of research model structure each layer under different vibration loading effects.
2. a kind of model test method of research framework structural vibration response feature as described in claim 1, which is characterized in that
The production process of step 2 insole board specifically includes following process:
A, go out the design drawing that pours of floor structure according to the size of model structure and vibration table surface size design, and mark on the diagram
The size of bright floor structure, the size and location of bottom plate fixed hole position, the size and location of bottom plate and model structure connection hole location；
B, according to the size for pouring the floor structure required in design drawing of floor structure, veneer is cut into one piece of bottom surface bottom
Baffle around plate and 6 groups, blend compounds band are successively fixed as entirety, are used as the mold poured；
C, the size and location of hole location is connect according to the fixed hole position of floor structure poured in design drawing and with model structure,
Packing material is cut into correspondingly sized and fixed corresponding position in a mold, is cast in mold uniform cast material is matched
In, the cast material wait pour removes surrounding baffle after solidifying completely and hole location filler obtains bottom plate.
3. a kind of model test method of research framework structural vibration response feature as described in claim 1, which is characterized in that
The concrete operations stream that model structure analog vibration load different from the fixation of shake table, the load of additional load and progress applies
Journey are as follows:
A, model structure bottom is fixedly connected with shake table by the bottom plate made, bottom plate and vibration are made by bolt first
Then platform fixation is placed on the rod structure of model structure bottom in the reserved hole location of bottom plate, bonding is poured at gap
Material makes model structure bottom be fixed as an entirety by bottom plate and shake table；
B, using the method for deficient manual quality's model, reasonably additional gross mass is calculated according to the principle of equivalent density, so
After be evenly arranged on each floor of model structure, additional labor quality is arranged in the center of floor, and passes through binding material
Fix additional labor quality mutually with model structure；
C, frequency, the intensity, duration for changing load vibration wave by the control system of shake table during the test, according to
The each group load parameter set carries out vibration load, by comparing identical rate of loading difference loading frequency and identical load frequency
The response characteristic research rate of loading and frequency of rate difference rate of loading drag structure pass through the affecting laws of model structure
Is carried out to the affecting laws of model structure the time decomposition research load duration to acceleration-time curve.
4. a kind of model test method of research framework structural vibration response feature as described in claim 1, which is characterized in that
Acceleration monitoring point in the step 3) is monitored by accelerometer, since data collection channel is limited, accelerometer
Set on 0,2,4,6 layer of left and right sides of model structure, accelerometer is placed in the same position of each monitoring floor, placement direction and vibration
The direction of vibration of dynamic platform is consistent, and fixes accelerometer mutually with model structure by binding material.
5. a kind of model test method of research framework structural vibration response feature as described in claim 1, which is characterized in that
Ess-strain monitoring point in the step 3) is monitored by foil gauge, foil gauge monitoring point be set to model structure beam and
On column, ess-strain monitoring site on column in the ess-strain monitoring site on the bottom of column, beam in the left end of beam, with
Research model structure changes in the ess-strain of effect of vibration flowering structure key member beam, column.
6. a kind of model assay systems of research framework structural vibration response feature, which is characterized in that including modelling system,
Model loading system and model assay system:
A, the modelling system is used to make model structure and makes the floor structure of fixed model, including Mold Making is set
Standby, reinforcing bar analog material, concrete analog material, model pour packing material；The Mold Making equipment includes for pouring
The Mold Making equipment of model structure and Mold Making equipment for pouring bottom plate, it is described for pouring the mold of model structure
Making apparatus mainly carries out veneer by the size of design to be cut into baffle around one piece of first bottom plate and 6 groups；It is described to be used for
The Mold Making equipment of bottom plate is poured mainly by the way that one piece of second bottom plate and 4 pieces of surrounding baffles is cut to size into veneer；
The reinforcing bar analog material is the galvanized wire of the fixation specification determined according to bending resistance equivalence principle；The concrete is similar
Material is the gypsum material of the suitable water paste ratio obtained according to the theory of similarity and uniaxial compressive test；The model pours filling material
Material is the foam block after shearing；
B, the model loading system includes the fixed device of model structure and vibration simulation load bringing device: the model structure
Fixed device is used to the bottom plate being fabricated to be bolted on shake table with fixed model structure；The vibration simulation
Load bringing device using shake table carry out vibrational waveform load work, shake table include table top and basis, high pressure fuel source and
Pipe-line system, electro-hydraulic servo actuator, analog control system, computer control system and corresponding data acquisition processing system；
C, acceleration change and structure of the model assay system for each layer of model structure in monitoring vibration loading procedure
The ess-strain of key member, including acceleration monitoring unit, ess-strain monitoring unit and strain data vasculum；It is described to add
Speed monitoring unit carries out record and the analysis of data using strain data vasculum, and the acceleration monitoring unit is piezoelectric type
Accelerometer is placed in the corner of each layer of model structure, and the data acquisition device shares 16 data collection channels, in conjunction with matching
The signal testing analysis system of set records and analyzes monitoring data, and piezoelectric accelerometer is connect with data acquisition device, number
It is connect by data line with computer according to vasculum；The ess-strain monitoring unit carries out data using strain data vasculum
Record and analysis, the ess-strain monitoring unit are concrete strain piece, and it is each that the concrete strain piece is set to model structure
At the left end of layer key member beam and suspension column, bond foil gauge and model structure by glue, same concrete strain piece is logical
Data acquisition line is crossed to connect by the way of bridge joint with data acquisition device.
7. a kind of model assay systems of research framework structural vibration response feature as claimed in claim 6, which is characterized in that
First base plate size poured for model structure model is 300mm × 300mm, the interior sky of baffle composition around every group
Between having a size of 300mm × 300mm × 150mm.
8. a kind of model assay systems of research framework structural vibration response feature as claimed in claim 6, which is characterized in that
The size of second bottom plate fixed for model structure and shake table is 500mm × 500mm, four pieces of surrounding baffle compositions
Interior bulk be 500mm × 500mm × 10mm, the size of four fixed hole positions in the middle part of insole board is 30mm × 30mm
×10mm。
9. a kind of model assay systems of research framework structural vibration response feature as claimed in claim 6, which is characterized in that
The foam block is cut according to the size of model structure beam, column.
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| CN109142671B (en) * | 2018-07-17 | 2021-04-30 | 中国地质大学（武汉） | Method for researching gradual change degradation rule of strength of water-saturated weak structural plane under blasting vibration |
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Effective date of registration: 20200731 Address after: 017000 Automobile City, Yiqi a town, Ordos City, Inner Mongolia Autonomous Region Patentee after: Ordos Panhong blasting Co., Ltd Address before: 430074 Wuhan Road, Hongshan, Shandong Province, Lu Lu Road, No. 388, No. Patentee before: CHINA University OF GEOSCIENCES (WUHAN CITY) |
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