CN107092747A - Trees wind load assay method - Google Patents
Trees wind load assay method Download PDFInfo
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- CN107092747A CN107092747A CN201710266110.6A CN201710266110A CN107092747A CN 107092747 A CN107092747 A CN 107092747A CN 201710266110 A CN201710266110 A CN 201710266110A CN 107092747 A CN107092747 A CN 107092747A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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Abstract
The invention discloses a kind of assay method of trees wind load.The assay method, including determine the position of action point of moment of flexure, moment of torsion, wind-force and its wind-force that trunk is produced under Action of Wind pressure.The acquisition of wind load is by installing deformation-sensor in trunk diverse location and azimuth, measuring the relation between maximum line strain, maximum shear strain and wind speed that trunk is produced under wind effect：εmax=f (v2)；Then under calm condition, then artificial pulling experiment is carried out to the trees, sets up moment of flexure and the relation of maximum line strain and shearing strain：M=g (εmax)；Relational expression M=g (the ε between moment of flexure and wind speed can be just set up finally according to two formula abovemax), referred to as charming appearance and behaviour moment of flexure characteristic equation.For selected trees, the charming appearance and behaviour moment of flexure characteristic equation of trees has specificity and uniqueness of having ready conditions.On this basis, it can also continue to determine wind load size and the position of action point acted on tree crown.The problem that trees wind load is difficult to determine is this method solve, ability is done harm to available for the wind resistance for monitoring/predicting forest zone trees and urban path tree and gardens ancient and well-known trees.
Description
Technical field
The present invention is to belong to forest wind disaster monitoring/electric powder prediction, by determining the wind load that blast is formed to trees
Lotus size and position of action point, can make accurate assess to security of the trees under different wind speed.
Background technology
By blast is applied to the wind-force formed on trees or wind bending moment can be special by shape of tree-crown and size, leaf
Levy, forest belt height and width, coefficient of air infiltration, topography and geomorphology and wind direction, wind speed etc. factors influence, therefore how quantified
Wind-force or wind bending moment that Action of Wind pressure is formed on the trees of forest zone, are the problems not yet solved very well so far, and therefore
Have impact on trees be broken under strong wind, the accuracy for the risk assessment that lodges.Although external existing trees wind load measure side
Simplification has been done in method to many influence factors, but still containing the more ginseng for being difficult to determine in wind bending moment and wind speed relational expression
Number.Due to parameter acquiring inconvenience or rough, the validity and convenience of trees safety evaluation are not only have impact on, or even be difficult to reality
Apply.
The content of the invention
In order to overcome the above-mentioned deficiencies of the prior art, the invention provides a kind of measurement trees wind load based on mechanical meaurement
The method of lotus, the position of action point of moment of flexure, moment of torsion, wind-force and its wind-force that measurement trunk is produced under Action of Wind pressure.
The technical solution adopted by the present invention is as follows：
The acquisition of the wind load of certain one tree is obtained as follows：
Step one：In once medium sized strong wind (for example 5~6 grades), trunk maximum strain and wind speed relational expression are set up：
εmax=f (v2)
Step 2：In subsequent calm day, torque and maximum strain relation are set up using pull test：M=g (εmax)
Step 3：Relational expression eliminates strain parameter obtained by being tested by above two, you can obtain the charming appearance and behaviour moment of flexure of the trees
Characteristic equation, i.e. M=g (f (v2))。
Compared with the prior art, beneficial effects of the present invention are as follows：
The wind load that this method simplifies and accurate trees are subject to, overcomes and external wind load is made to estimate roughly not
Foot, is accurate research charming appearance and behaviour trees fracture, the premise of trees lodging.In addition, this method, which can also be determined, acts on tree
The application point height labeled.
Brief description of the drawings
The schematic diagram that Fig. 1 tests for the strong wind in the present invention
Fig. 2 is the sensor mounting means in strong wind experiment in the present invention
Fig. 3 for the present invention in pulling experiment schematic diagram
Fig. 4 is the position of action point of the moment of flexure, moment of torsion, wind-force and its wind-force that are produced under the measurement Action of Wind pressure in the present invention
Experiment schematic diagram
Fig. 5 is the position of action point of the moment of flexure, moment of torsion, wind-force and its wind-force that are produced under the measurement Action of Wind pressure in the present invention
Experiment in sensor mounting means
Embodiment
Illustrate the embodiment of the present invention below in conjunction with accompanying drawing.
Under the experimentation of the strong wind experiment：Before strong wind arriving, 2 displacements biographies are installed on the trunk of institute's assize wood
Sensor, 2 displacement transducers are axially mounted to the orthogonal diameters of trunk, and install an air velocity transducer again by tree, high
Spend (Fig. 1) about identical with tree crown center of gravity height.After blowing, application data Acquisition Instrument records the information data of each sensor.Then will
The data analysis software of collection is analyzed and processed, you can obtain trunk maximum strain and wind speed relational expression εmax=f
(v2), wherein,
Described pulling experiment process is as follows：In subsequent calm day, pull test is carried out to same one tree, i.e., in the tree
It is a rope for being connected to force snesor and applies horizontal pull (direction of horizontal pull is roughly the same with prevailing wind direction), makes trees
Trunk produces flexural deformation.One deformation-sensor (Fig. 3) is installed at the trunk back side along direction of pull on institute's assize wood.Work as tree
Dry when being understood pulling force effect, trees are occured bending and deformation, and maximum can be measured by the displacement transducer on trunk
Bending strain, and set up the relational expression M=g (ε of moment of flexure and maximum strainmax)。
Last simultaneous torque and maximum strain relational expression and maximum strain and wind speed relational expression, it is possible to obtain charming appearance and behaviour torque
Equation：M=g (f (v2))。
The size and position of action point for determining wind-force, can be before strong wind arriving, in the trunk selection of institute's assize wood
The displacement transducer of 2 measurement axial deformations is respectively installed in upper and lower two cross sections, each section, and 2 sensors are along cross section
A pair of orthogonal diameter it is axially mounted, and an air velocity transducer (Fig. 4) is installed by tree again.After blowing, application data collection
Instrument records the information data of each sensor.Then the data analysis software of collection is handled, and application is real by pulling force
Test obtained moment of flexure and the relational expression of maximum strain, you can respectively obtain the moment M 1 and M2 of correspondence different height on trunk, lead to
The wind-force that is formed of the blast on tree crown can be obtained by crossing analysisThe application point height of wind-force
Set up some algorithm of moment of flexure and maximum strain relational expression：
Axial strain ε is measured by axial sensor①、ε②, according to Mi=εiEπD3(1-α4The relation moment of thrust M of)/32y、
Mx, then byIt can obtain the maximum axial strain gauge at trunk periphery when pulling force is F
Formula：The trunk when pulling force is F can be obtained
Maximum axial strain at periphery, so as to set up torque and maximum strain relational expression.
Claims (3)
1. a kind of trees wind load assay method, it is characterised in that：Described acquisition charming appearance and behaviour moment of flexure characteristic equation is mainly by such as
Lower step：(1) trunk maximum strain and wind speed relational expression in once medium sized strong wind (for example 5~6 grades), are set up：εmax
=f (v2).(2) in subsequent calm day, torque and maximum strain relation are set up using pull test：M=g (εmax).(3) will
Relational expression eliminates strain parameter obtained by above two experiment, you can obtain the charming appearance and behaviour moment of flexure characteristic equation of the trees, i.e. M=
g(f(v2))。
Described strong wind experimentation is as follows：Before strong wind arriving, 2 measurement axial deformations are installed on the trunk of institute's assize wood
Displacement transducer, sensor will be arranged on a pair of orthogonal diameter shaft of the same cross section of trunk upwards, and be installed again by tree
One air velocity transducer, height is about identical with tree crown center of gravity height.After blowing, application data Acquisition Instrument records the information of each sensor
Data.Then the data analysis software of collection is analyzed and processed, you can obtain trunk maximum strain and wind speed relation
Formula εmax=f (v2), wherein,
Described pulling experiment process is as follows：In subsequent calm day, pull test is carried out to same one tree, i.e., is one in the tree
It is connected to the rope of force snesor and applies horizontal pull (direction of horizontal pull is roughly the same with prevailing wind direction), makes trees trunk
Produce flexural deformation.One deformation-sensor is installed at the trunk back side along direction of pull on institute's assize wood.When trunk is understood
During pulling force effect, trees are occured bending and deformation, and maximum bending strain can be measured by the displacement transducer on trunk,
And set up the relational expression M=g (ε of moment of flexure and maximum strainmax)。
Above two is tested to obtained relational expression, strain parameter is eliminated, you can set up the charming appearance and behaviour moment of flexure characteristic equation M of the tree
=g (f (v2))。
2. wind load assay method according to claim 1, it is characterised in that：If determining size and the effect of wind-force
Point position, can select upper and lower two cross sections, each section respectively installs 2 before strong wind arriving in the trunk of institute's assize wood
The displacement transducer of axial deformation is measured, 2 sensors are axially mounted along a pair of orthogonal diameter of cross section, and by tree again
One air velocity transducer is installed.After blowing, application data Acquisition Instrument records the information data of each sensor.Then by the number of collection
Handled according to analysis software, and using the moment of flexure and the relational expression of maximum strain obtained by pulling experiment, you can respectively
The moment M 1 and M2 of correspondence different height on trunk are obtained, the wind-force that is formed of the blast on tree crown can obtain by analysisThe application point height of wind-force
3. wind load assay method according to claim 1, it is characterised in that：The sensor measures number in all cases
Value is automatically performed by the acquisition terminal of trees Mechanical Analyzer, and tree can be just evaluated using the special analysis program of system
Wind load on wood.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710266110.6A CN107092747A (en) | 2017-04-21 | 2017-04-21 | Trees wind load assay method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710266110.6A CN107092747A (en) | 2017-04-21 | 2017-04-21 | Trees wind load assay method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109060557A (en) * | 2018-06-14 | 2018-12-21 | 安徽农业大学 | Trees torque and coefficient of rigidity test method |
| CN109141807A (en) * | 2018-09-18 | 2019-01-04 | 中南大学 | The model in wind tunnel and wind tunnel test methods of photovoltaic structure |
| CN110646125A (en) * | 2019-10-09 | 2020-01-03 | 北京林业大学 | Nondestructive testing device and method for tree grip |
| CN111238944A (en) * | 2019-11-01 | 2020-06-05 | 安徽农业大学 | Equipment and method for monitoring/predicting wind resistance of trees |
| CN111439672A (en) * | 2020-05-29 | 2020-07-24 | 湛江港（集团）股份有限公司 | Anti-creep device with wind-resistant anti-skid detection function |
| CN113188745A (en) * | 2021-04-26 | 2021-07-30 | 北京林业大学 | Method and device for testing wind load of crown of standing tree |
| CN114396975A (en) * | 2022-01-05 | 2022-04-26 | 深圳市金阳盛城市服务集团有限公司 | Tree lodging-resistant monitoring and early warning method and device, electronic equipment and medium |
| CN115299287A (en) * | 2022-07-08 | 2022-11-08 | 广州市中森园林绿化工程有限公司 | Support method and support device for tree lodging resistance |
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| CN102636148A (en) * | 2012-04-16 | 2012-08-15 | 安徽农业大学 | Nondestructive measurement method for tree deformation |
| CN103018092A (en) * | 2012-11-28 | 2013-04-03 | 安徽农业大学 | Full-amount testing method of tree mechanical quantity |
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2017
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| CN102636148A (en) * | 2012-04-16 | 2012-08-15 | 安徽农业大学 | Nondestructive measurement method for tree deformation |
| CN103018092A (en) * | 2012-11-28 | 2013-04-03 | 安徽农业大学 | Full-amount testing method of tree mechanical quantity |
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| YIJUN WU 等: "Measurement and mechanical analysis of the strains-stresses induced by tree-pulling experiments in tree stems", 《TREES》 * |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109060557A (en) * | 2018-06-14 | 2018-12-21 | 安徽农业大学 | Trees torque and coefficient of rigidity test method |
| CN109141807B (en) * | 2018-09-18 | 2024-01-30 | 中南大学 | Wind tunnel test model and wind tunnel test method of photovoltaic structure |
| CN109141807A (en) * | 2018-09-18 | 2019-01-04 | 中南大学 | The model in wind tunnel and wind tunnel test methods of photovoltaic structure |
| CN110646125A (en) * | 2019-10-09 | 2020-01-03 | 北京林业大学 | Nondestructive testing device and method for tree grip |
| CN111238944A (en) * | 2019-11-01 | 2020-06-05 | 安徽农业大学 | Equipment and method for monitoring/predicting wind resistance of trees |
| CN111238944B (en) * | 2019-11-01 | 2022-06-14 | 安徽农业大学 | Equipment and method for monitoring/predicting wind resistance of trees |
| CN111439672A (en) * | 2020-05-29 | 2020-07-24 | 湛江港（集团）股份有限公司 | Anti-creep device with wind-resistant anti-skid detection function |
| CN113188745A (en) * | 2021-04-26 | 2021-07-30 | 北京林业大学 | Method and device for testing wind load of crown of standing tree |
| CN113188745B (en) * | 2021-04-26 | 2022-08-30 | 北京林业大学 | Method and device for testing wind load of crown of standing tree |
| CN114396975A (en) * | 2022-01-05 | 2022-04-26 | 深圳市金阳盛城市服务集团有限公司 | Tree lodging-resistant monitoring and early warning method and device, electronic equipment and medium |
| CN114396975B (en) * | 2022-01-05 | 2023-05-23 | 深圳市金阳盛城市服务集团有限公司 | Tree lodging-resistant monitoring and early warning method and device, electronic equipment and medium |
| CN115299287A (en) * | 2022-07-08 | 2022-11-08 | 广州市中森园林绿化工程有限公司 | Support method and support device for tree lodging resistance |
| CN115299287B (en) * | 2022-07-08 | 2024-05-28 | 广州市中森园林绿化工程有限公司 | Tree lodging-resistant supporting method and supporting device |
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Application publication date: 20170825 |