CN102288495A - Method for testing dynamic stiffness of pillar system of bamboo/wooden structure house - Google Patents
Method for testing dynamic stiffness of pillar system of bamboo/wooden structure house Download PDFInfo
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- CN102288495A CN102288495A CN201110152554XA CN201110152554A CN102288495A CN 102288495 A CN102288495 A CN 102288495A CN 201110152554X A CN201110152554X A CN 201110152554XA CN 201110152554 A CN201110152554 A CN 201110152554A CN 102288495 A CN102288495 A CN 102288495A
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 235000017166 Bambusa arundinacea Nutrition 0.000 title claims abstract description 13
- 235000017491 Bambusa tulda Nutrition 0.000 title claims abstract description 13
- 241001330002 Bambuseae Species 0.000 title claims abstract description 13
- 235000015334 Phyllostachys viridis Nutrition 0.000 title claims abstract description 13
- 239000011425 bamboo Substances 0.000 title claims abstract description 13
- 238000012360 testing method Methods 0.000 title claims abstract description 11
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- 238000010998 test method Methods 0.000 claims description 10
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- 238000001228 spectrum Methods 0.000 description 13
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- 238000005316 response function Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
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Abstract
The invention provides a method for testing the dynamic stiffness of a pillar system of a bamboo/wooden structure house. The method is short in test time, accurate in data and reliable. The method comprises the following steps of: knocking a pillar which is provided with an acceleration sensor by a force hammer which is provided with a force sensor; sending an output signal which is detected by the force sensor and represents the size of a knocking force T of the force hammer and an output signal which is detected by the acceleration sensor and represents the size of an acceleration G of the pillar into a signal conditioning box, amplifying, filtering and then outputting the output signals; sending the output signals into a signal acquisition box for data acquisition; performing analog/digital (A/D) conversion, performing data processing, and thus obtaining a frequency domain graph in which dynamic stiffness amplitude A is equal to a ratio of T to G; acquiring frequency f at some order and the dynamic stiffness amplitude A which corresponds to the frequency f at the order from the frequency domain graph; and calculating a dynamic stiffness effective value at the frequency f at the order.
Description
Technical field
The present invention relates to is light-duty bamboo/method of testing of wooden frame structure pillar system dynamic stiffness, and belong to and measure the wooden structures technical field of buildings.
Background technology
Light-duty wooden structures house more and more is subjected to common people's favor.Wooden frame structure has that structural stability height, fire protecting performance and sound insulation property are good, the permanance advantages of higher, and particularly in the earthquake prone areas, its performance is particularly outstanding.
The ability of resistance to deformation is called quiet rigidity under the static load, and the ability of resistance to deformation is called dynamic stiffness under the dynamic loading, promptly causes the needed dynamic force of unit amplitude.Dynamic stiffness is meant the ability of structure resistance to deformation under specific dynamic excitation.Dynamic stiffness is the key index of description scheme damping property.
In timber structure or bamboo matter structural construction, support is a measure that guarantees the planar structure spatial stability.Vertical support can prevent the inclination of roof truss effectively, and helps to keep the globality of roof system, thereby plays a role with also helping to guarantee roof system rigidity reliability, and is unlikely to suffer unnecessary weakening.
Therefore, the pillar structural system in the wooden building is carried out dynamic stiffness performance test evaluation, for the design effort in light-duty bamboo/timber buildings house provides reference, significant.
Summary of the invention
The purpose of this invention is to provide a kind of test duration short, data are accurate and the method for testing of reliable bamboo/wooden frame structure pillar system dynamic stiffness.
The method of testing of bamboo of the present invention/wooden frame structure pillar system dynamic stiffness is to knock the pillar that is provided with acceleration transducer with the power hammer that force transducer is housed; The output signal of the output signal of the antistress hammer percussion power T size of force transducer detection and the reaction pillar acceleration G size that acceleration transducer detects is sent into signal process box after amplification, filtering, export, send into again and carry out data acquisition in the signals collecting case; Carry out A/D then and change laggard line data processing, draw the frequency domain figure of dynamic stiffness amplitude A=T/G; Drawing certain order frequency f from this frequency domain figure reaches and the corresponding dynamic stiffness amplitude of this order frequency f A; With
Calculate the dynamic stiffness effective value under this order frequency f.
Above-mentioned method of testing, it also comprise with
Calculate the step of the dynamic stiffness peak-to-peak value under this order frequency f.
Above-mentioned method of testing, described certain order frequency f is meant fundamental frequency f
1From frequency domain figure, can draw fundamental frequency f
1Size and and fundamental frequency f
1Corresponding dynamic stiffness amplitude A; With
Calculate fundamental frequency f
1Under the dynamic stiffness effective value, with
Can calculate fundamental frequency f
1Under the dynamic stiffness peak-to-peak value.
Above-mentioned method of testing, described certain order frequency f is meant second order frequency f
2From frequency domain figure, can draw second order frequency f
2Size and and second order frequency f
2Corresponding dynamic stiffness amplitude A; With
Calculate second order frequency f
2Under the dynamic stiffness effective value, with
Can calculate second order frequency f
2Under the dynamic stiffness peak-to-peak value.
Beneficial effect of the present invention: the present invention uses the transient excite method of mechanical kinetics, and light-duty bamboo/wooden frame structure pillar system dynamic stiffness is measured.1, this method of testing of Cai Yonging can objectively respond the situation of the dynamic deformation of the wooden pillar under the actual state, and its test duration is short, informative data, accurate and reliable.2, can from the frequency domain figure of test specimen, obtain fundamental frequency (f
1), second order frequency (f
2) and the dynamic stiffness amplitude etc., the analysis of the line correlation of going forward side by side.The pillar structural system that the present invention is directed in the wooden building carries out the dynamic stiffness performance test, estimates its dynamic stability, for the design effort in light-duty bamboo/timber buildings house provides reference, has broad application prospects.
Description of drawings
Fig. 1 is a pillar frequency response function determination test block diagram;
Fig. 2 is the frequency response function frequency spectrum (H of the pillar among the embodiment 1
1);
Fig. 3 is the dynamic stiffness frequency spectrum (1/H of the pillar among the embodiment 1
1).
Embodiment
Embodiment: the live in peace dynamic stiffness test of demonstration roof beam column system of bamboo matter structural seismic.
Testing procedure.
The first step, referring to Fig. 1, the bamboo reorganization square bar that to measure used pillar 1 material be carbonization series, the height H of this pillar from basic end face to the buildings peak is that the square bar width of 4.5m, post is 130mm.
Second step is referring to each instrument of connection shown in Figure 1.Be used to knock the force transducer 3 that detection power hammer percussion power T size is set on the power hammer 2 of pillar 1.The acceleration transducer 4 that detects pillar acceleration G size is set on pillar.Force transducer 3 and acceleration transducer 4 outputs connect the input of AZ signal process box, and the output of AZ signal process box connects AZ signals collecting case (perhaps PCI9111 card).The output of AZ signals collecting case connects the digital signal processing dsp chip of computing machine after the A/D conversion.
In the 3rd step, call signal is the SsCras systematic analysis software that positive soft project Ltd is pacified in Nanjing, sets up operation, carries out the parameter setting, and parameter is set to: analysis frequency is 1000Hz; Triggering mode is negative trigger (triggering level 5%, trigger delay-20); Signal amplification factor is 100; Change for preventing that frequency from mixing, select the upper frequency limit of low-pass filter, frequency filtering is made as 1000Hz.
Whether the 4th step before formal the measurement, entered the oscillography mode, knocked test specimen continuously, connect with the inspection apparatus connecting line, and whether power supply is opened, and parameter setting, program control amplification and enlargement factor whether shelves are set reasonable.Should reset as unreasonable.
The 5th step, knock pillar with rubber power hammer, the triggering collection data are carried out signal spectral analysis.
In the 6th step, read fundamental frequency value f by the 1st, 2 peak values in the frequency domain figure
1The dynamic stiffness amplitude A=696.65N/ (m/s of=13.67Hz, fundamental frequency correspondence
2) and second order frequency f
2The dynamic stiffness amplitude A=222.63N/ (m/s of=78.13Hz, second order frequency correspondence
2).
Fundamental frequency f
1Under=the 13.67Hz, pillar dynamic stiffness effective value
Pillar dynamic stiffness peak-to-peak value
Second order frequency f
2Under=the 78.13Hz, pillar dynamic stiffness effective value
Pillar dynamic stiffness peak-to-peak value
The present invention adopts the power hammer to knock the pillar that is provided with acceleration transducer; The output signal of the output signal of the antistress hammer percussion power T size of force transducer detection and the reaction pillar acceleration G size that acceleration transducer detects is sent into signal process box after amplification, filtering, export, send into again and carry out data acquisition in the signals collecting case; And introduce SsCras system and analysis software, carry out the process of A/D conversion process.
Percussion power T (first passage) unit is (N), and acceleration G (second channel) unit is (mm/s
2).
Have a force transducer on the power hammer tup.When the power hammer knocks measuring object, just there is a masterpiece to be used on the tup, the size of this power receives by force transducer.The output of force transducer then is a quantity of electric charge, and this quantity of electric charge is exported after amplification, the filtering then through the first passage of conditioning case, sends in the vasculum.The output of conditioning case is a voltage, and its voltage is sent into the first passage of vasculum, and carries out the collection of force signal by software and capture card, and voltage at this moment changes into the size of readable power automatically by its correction factor.
The power hammer is gone up Rubber end generation pumping signal (CH1) is installed; Be fixed on the acceleration transducer acceptance response signal (CH2) on the pillar.Mechanical quantity (acceleration) signal transition becomes electric signal.The electric signal of acceleration transducer output after signal process box amplification, filtering, is gathered and analysis of spectrum its A/D conversion of carrying out signal.
It is that the power hammer knocks pillar that described A/D conversion is gathered, and evokes the pillar system vibration, and with the triggering mode image data, mechanical signal (acceleration signal) machine interface as calculated enters the digital signal processing dsp chip, carries out the process of A/D conversion process.
Described analysis of spectrum is to carry out signal spectral analysis, and at H
1And 1/H
1Read the amplitude of the 1st rank, the 2nd rank natural frequency value and the dynamic stiffness of post in the frequency spectrum.
Signal process box has anti alias filter and signal amplifier, anti alias filter carries out filtering with pumping signal, signal entering signal collecting part after signal amplifier amplifies then, signals collecting partly has computer interface, the digital signal processing dsp chip, A/D converter, the simulating signal that collects machine interface as calculated enters the digital signal processing dsp chip, carry out digital signal processing, convert digital signal to by the CPU processor in the signal input part entering signal Treatment Analysis part of the CPU processor in the signal processing analysis part through A/D converter then, carry out Treatment Analysis by CPU processor and system controlling software thereof.
By data analysis, can draw the order frequency response function frequency spectrum (H of this pillar structural system
1) and dynamic stiffness frequency spectrum (1/H
1), from 1/H
1Dynamic stiffness curve and an order dynamic stiffness amplitude be can draw in the frequency spectrum, thereby the dynamic stiffness effective value and the peak-to-peak value of each order calculated with frequency change.Contrast Fig. 2,3, the H of actual measurement
1Frequency spectrum and measurement data are seen Fig. 2,1/H
1Frequency spectrum and measurement data are seen Fig. 3, and the horizontal ordinate in the frequency spectrum is represented frequency (Hz), and ordinate is represented amplitude (EU).
Among Fig. 2 and Fig. 3, the same order natural frequency minimum value of the frequency response function of this pillar system is exactly the maximal value of its dynamic stiffness, is maximal value in Fig. 3 dynamic stiffness frequency spectrum as the minimum value in Fig. 2 frequency response function.Among Fig. 3, the dynamic stiffness frequency spectrum of pillar system is a curve with frequency change.Read fundamental frequency, second order frequency and corresponding dynamic stiffness amplitude according to Fig. 3.
Claims (4)
1. the method for testing of bamboo/wooden frame structure pillar system dynamic stiffness is characterized in that: knock the pillar that is provided with acceleration transducer with the power hammer that force transducer is housed; The output signal of the output signal of the antistress hammer percussion power T size of force transducer detection and the reaction pillar acceleration G size that acceleration transducer detects is sent into signal process box after amplification, filtering, export, send into again and carry out data acquisition in the signals collecting case; Carry out A/D then and change laggard line data processing, draw the frequency domain figure of dynamic stiffness amplitude A=T/G; Drawing certain order frequency f from this frequency domain figure reaches and the corresponding dynamic stiffness amplitude of this order frequency f A; With
Calculate the dynamic stiffness effective value under this order frequency f.
2. method of testing as claimed in claim 1, it is characterized in that: further comprising with
Calculate the step of the dynamic stiffness peak-to-peak value under this order frequency f.
3. method of testing as claimed in claim 1 or 2 is characterized in that: described certain order frequency f is meant fundamental frequency f
1
4. method of testing as claimed in claim 1 or 2 is characterized in that: described certain order frequency f is meant second order frequency f
2
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| CN 201110152554 CN102288495B (en) | 2011-06-09 | 2011-06-09 | Method for testing dynamic stiffness of pillar system of bamboo/wooden structure house |
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|---|---|---|---|
| CN 201110152554 CN102288495B (en) | 2011-06-09 | 2011-06-09 | Method for testing dynamic stiffness of pillar system of bamboo/wooden structure house |
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|---|---|
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| CN102288495B CN102288495B (en) | 2013-03-27 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102980756A (en) * | 2012-11-20 | 2013-03-20 | 西南交通大学 | Method and system for testing dynamic stiffness |
| CN103091402A (en) * | 2013-02-25 | 2013-05-08 | 王智恒 | Acoustic measurement method and device for dynamic stiffness of woodworking band saw blade |
| CN104977218A (en) * | 2015-07-16 | 2015-10-14 | 戴振东 | Device and method for detecting rigidity of micro elastic parts |
| CN108613734A (en) * | 2018-04-28 | 2018-10-02 | 华南农业大学 | A kind of identifying system of beam vibration frequency and recognition methods |
| CN109100245A (en) * | 2018-09-20 | 2018-12-28 | 无锡吉兴汽车声学部件科技有限公司 | A kind of device measuring energy absorbent block load-deformation curve |
| CN111272586A (en) * | 2020-02-22 | 2020-06-12 | 江苏东南特种技术工程有限公司 | Method for detecting vertical load of existing building structure by exciting vibration force |
| CN113504018A (en) * | 2021-07-13 | 2021-10-15 | 浙江吉利控股集团有限公司 | Method and system for quickly testing local static stiffness of mechanical structure |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108593270B (en) * | 2018-01-11 | 2019-12-03 | 上海大学 | A kind of single-degree-of-freedom vibration absorber test platform |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102980756A (en) * | 2012-11-20 | 2013-03-20 | 西南交通大学 | Method and system for testing dynamic stiffness |
| CN102980756B (en) * | 2012-11-20 | 2015-11-04 | 西南交通大学 | The method of testing of dynamic stiffness and system |
| CN103091402A (en) * | 2013-02-25 | 2013-05-08 | 王智恒 | Acoustic measurement method and device for dynamic stiffness of woodworking band saw blade |
| CN104977218A (en) * | 2015-07-16 | 2015-10-14 | 戴振东 | Device and method for detecting rigidity of micro elastic parts |
| CN108613734A (en) * | 2018-04-28 | 2018-10-02 | 华南农业大学 | A kind of identifying system of beam vibration frequency and recognition methods |
| CN109100245A (en) * | 2018-09-20 | 2018-12-28 | 无锡吉兴汽车声学部件科技有限公司 | A kind of device measuring energy absorbent block load-deformation curve |
| CN111272586A (en) * | 2020-02-22 | 2020-06-12 | 江苏东南特种技术工程有限公司 | Method for detecting vertical load of existing building structure by exciting vibration force |
| CN113504018A (en) * | 2021-07-13 | 2021-10-15 | 浙江吉利控股集团有限公司 | Method and system for quickly testing local static stiffness of mechanical structure |
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Application publication date: 20111221 Assignee: GUANNAN YINDELONG WOOD INDUSTRY CO.,LTD. Assignor: Nanjing Forestry University Contract record no.: 2018320000135 Denomination of invention: Method for testing dynamic stiffness of pillar system of bamboo/wooden structure house Granted publication date: 20130327 License type: Common License Record date: 20180725 |
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Application publication date: 20111221 Assignee: JIANGSU SENZHIHU BUILDING ENGINEERING CO.,LTD. Assignor: Nanjing Forestry University Contract record no.: 2019320000196 Denomination of invention: Method for testing dynamic stiffness of pillar system of bamboo/wooden structure house Granted publication date: 20130327 License type: Common License Record date: 20190625 |
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Effective date of registration: 20191220 Address after: 210000 No. 532-2 East Zhongshan Road, Qinhuai District, Jiangsu, Nanjing Co-patentee after: Zhao Tianchang Patentee after: JIANGSU SENZHIHU BUILDING ENGINEERING CO.,LTD. Address before: Nanjing City, Jiangsu province 210037 Longpan Road No. 159 Patentee before: Nanjing Forestry University |
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Granted publication date: 20130327 |