CN106092628B - A kind of civil engineering structure solar radiation temperature-effect analysis method and system - Google Patents
A kind of civil engineering structure solar radiation temperature-effect analysis method and system Download PDFInfo
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Abstract
The invention discloses a kind of civil engineering structure solar radiation temperature-effect analysis method and system, this method comprises the following steps: the geographic logitude and latitude of structure position is determined, by the ambient air temperature and surface wind speed of installing sensing device measurement structure in structure.It is calculated using structure solar radiation model of the invention and determines the direct radiation intensity, scattering strength and the reflected intensity that act on body structure surface.According to the intensity of solar radiation of body structure surface, dynamic temperature boundary condition is established, the Equations of Three-dimension using finite element method structure is the dynamic temperature effect that can determine civil engineering structure surface and its internal any point.The present invention is suitable for temperature-effect analysis and assessment of various types of civil engineering structures under solar radiation effect, especially suitable for having the structure of smaller dimensioning and periphery in the presence of the analysis assessment of the temperature effect of the structure of complicated masking.
Description
Technical field
The present invention relates to temperature effect assessment technology more particularly to a kind of civil engineering structure solar radiation temperature effects point
Analyse method and system.
Background technique
Civil engineering structure inevitably bears the effect of extraneous load and natural environment for a long time in outdoor military service.Knot
Structure will cause uneven nonlinear temperature distribution under the influence of the environmental factors such as solar radiation and temperature change, to generate
Apparent temperaturing fielding effect.Studies at home and abroad show that will lead to Wen Zhixiao very serious under strong time varying temperature load action
It answers: such as due to time varying temperature caused by frequency variation up to 5% of the long-span bridge girder construction within one day.Civil engineering
Structure easily causes strong nonlinear time-varying altitude temperature difference effect under strong temperature load effect, causes structure to occur serious
Temperature causes stress collection to neutralize temperature and causes large deformation, causes damage to further result in structure and performance degradation even temperature occur, and then cause
Structure is weakened using function, it is difficult to meet the requirement of safety under the conditions of long service, applicability and durability.Cause
How this, guarantee safety and durability of the civil engineering structure under temperature load effect, be pendulum in vast engineering technology people
Member and a realistic problem in face of researcher, have important scientific meaning and engineering significance.
Since the temperature-effect analysis of civil engineering structure is related to astrophysics, thermal conduction study, new material science, wind work
The problem of many various basic theories such as journey, finite element theory are a typical multi-crossed disciplines.Therefore, temperature effect
Problem is complex, and existing theory- method-technology means are still not perfect.In early days simultaneously to the research of engineering structure temperature effect
The time-varying effecting of temperature is not accounted for, often simply based on the temperature difference of structural environment come the temperature effect of research structure.Due to
This method can not effectively consider transient state temperature field, therefore the side of the static temperature load often through artificially enlarged structure
Method carries out temperature load estimation, this is substantially a kind of very coarse temperaturing fielding effect processing method, can only obtain the cause of structure temperature
The substantially variation range of effect.The solar radiation Study on Temperature Effects of foreign countries' engineering structure since the end of the seventies in last century, but
Research object focuses primarily upon simple concrete box-beam bridge structure.The main reason is that concrete box-beam bridge structure type letter
It is single, therefore temperature load model is simple, the temperaturing fielding effect of structure also relatively easily determines.
The temperature-effect analysis of civil engineering structure is mainly used based on traditional astronomy solar radiation model at present,
Intensity of solar radiation and the temperature boundary effect of body structure surface are acted on by foundation to solve the temperature effect of structure.At present
, analyzing evaluation method relatively simple for the understanding of the mechanism of civil engineering structure solar radiation temperature effect and means are also very
Scarcity, this directly results in structure temperature Load value and temperature effect calculates and biggish error occurs, existing astronomical based on tradition
Often there is bigger difference in the result and measured result for learning solar radiation model, it is difficult to coincide.Existing method does not account for structure
Service Environment factor such as humidity, wind speed, environment masking, structure lack from mechanism from the influence of the factors such as masking to temperature
Spend the correlative study of the Fundamental Aspects of Load Model and time varying temperature effect.
Summary of the invention
The technical problem to be solved in the present invention is that for the defects in the prior art, a kind of civil engineering structure is provided too
Positive radiation temperature effect analysis method and system.
The technical solution adopted by the present invention to solve the technical problems is: a kind of civil engineering structure solar radiation temperature effect
Answer analysis method, comprising the following steps:
1) pass through the ambient air temperature and surface wind speed of sensing device measurement structure, the ambient air temperature and surface
Wind speed information is for calculating the coefficient of heat transfer；
2) according to the geographic logitude and latitude of structure position, any moment is calculated in structure position one day too
Positive elevation angle；Then it is calculated using structure solar radiation model and determines the intensity of solar radiation for acting on body structure surface, specifically such as
Under:
2.1) the i-th moment in one day is set, the intensity of solar radiation of civil structure is acted on are as follows:
Wherein,
Wherein: tsThe time of solar radiation is born for body structure surface in one day；tk1For morning time coefficient；tk2For the lower period of the day from 11 a.m. to 1 p.m
Between coefficient；t1And t2Respectively day at sunny moment and sunset sun moment；tmSun spoke for body structure surface by maximum intensity
At the time of penetrating；T indicates the solar radiation moment；A and b is the coefficient of radiation patterns；
2.2) the intensity of solar radiation I for acting on civil structure is determinedcivil:
Icivil=Im·(1-Se0)
Se0For the intensity of solar radiation error of two kinds of results:
Wherein: SIFor the intensity of solar radiation being subject in one day using traditional resulting body structure surface of solar radiation model
Summation；SImIt is total for the intensity of solar radiation that is subject in one day based on the modified resulting body structure surface of structure solar radiation model
With；
Wherein: IiFor Globalradiation intensity suffered by the i-th moment civil structure surface；siFor the solar radiation of the i-th moment
Intensity factor；t1And t2When respectively day is sunny and when the sunset sun；
3) according to direct radiation intensity, scattering strength and the reflection on the physical parameter of structure and the surface for acting on structure
The information such as intensity establish the dynamic temperature boundary condition for being suitable for structure temperature effect analysis；
4) according to the body structure surface intensity of solar radiation and thermal boundary condition having built up, any position in structure is determined
Thermo parameters method and temperature effect.
According to the above scheme, the structure dynamics temperature boundary condition are as follows:
U=e (T*-Ts)
In formula: energy exchanging rate of the U between structural outer surface and atmospheric environment；E is equivalent heat exchange coefficient；T*For etc.
Imitate temperature；TsFor civil structure surface temperature；TaFor the ambient air temperature of actual measurement；α is body structure surface radiation absorption factor.
According to the above scheme, the three-dimensional that the thermo parameters method of any position and temperature effect pass through solution structure in the structure
The equation of heat conduction determines.
According to the above scheme, S in the step 2.2)IIt is to determine body structure surface too based on traditional astronomy radiation patterns
Positive direct solar radiation intensity, reflected radiation and scattering radiation intensity, then obtain the total radiation intensity of structure.
A kind of civil engineering structure solar radiation temperature-effect analysis system characterized by comprising
Structural environment temperature monitoring module, for passing through the ambient air temperature and surface wind of sensing device measurement structure
Speed；
Structural environment air monitoring module, for the wind speed of real-time monitoring structural perimeter, acquisition acts on body structure surface
Wind speed information；
Structure intensity of solar radiation analysis module, for according to structure position, determination to act on structural outer surface
Direct radiation intensity, scattering strength and reflected intensity；
Structure temperature boundary condition analysis module, for according to the physical parameter of structure and the surface for acting on structure
Direct radiation intensity, scattering strength and Reflection intensity information, establish the thermal boundary condition for being suitable for structure temperature effect analysis；
Structure solar radiation temperature-effect analysis assessment module, for strong according to the body structure surface solar radiation having built up
Degree and thermal boundary condition, determine the thermo parameters method and temperature effect of any position in structure.
The beneficial effect comprise that:
One, civil engineering structure solar radiation model proposed by the present invention has clear physics conception, analysis fast and effective
The advantages of.The solar radiation model has good applicability, is suitable for various different civil engineering structures in solar radiation
The analytical calculation of structure time varying temperature field and temperature effect under effect.
Two, traditional that the very objects such as the atmosphere of large scale, earth's surface are often suitable for based on astronomical solar radiation model.
And for geometric scale only has hundreds of meters of tens of rice of civil engineering structure, conventional model and method cannot fully consider week
Influence of the masking disturbing effect of the small-sized objects such as side trees, building, the vehicles to radiation intensity.And it is proposed by the present invention
New model has good applicability, can fully consider the surrounding enviroment interference of engineering structure, have good analysis precision.
It can be efficiently against the obvious deficiency of conventional model method analytical error greatly.
Three, by 12 points at noon of existing model and the resulting radiation intensity peak value of method, the resulting structure of response computation
The surface peak temperature time be about afternoon 13:30 between 14:00.And measured result then shows that the temperature peak of body structure surface is past
It is past to delay 1~2 hour.Obviously, traditional astronomy model method is used directly for civil engineering structure in the presence of obvious insufficient.
And correction model proposed by the present invention can accurately analyze the moment where the peak temperature of structure, coincide very with measured result
Good, one for overcoming current method is obvious insufficient.
Four, existing model method analysis gained engineering structure temperature temperature-rise period and temperature-fall period are deposited with measured result
In notable difference.And method proposed by the present invention is used, incorrect temperature-rise period and temperature-fall period can be improved, realizes building
The accurate analysis and assessment of engineering structure dynamic temperature variation, one for overcoming current method is obvious insufficient.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing:
Fig. 1 is a kind of flow diagram of civil engineering structure solar radiation temperature-effect analysis method of the invention；
Fig. 2 is solar radiation effect schematic diagram；
Fig. 3 is large-scale building bridge structure schematic diagram；
Fig. 4 is bridge steel box girder schematic cross-section；
Fig. 5 is steel reinforced concrete combined bridge deck schematic diagram；
Fig. 6 is that steel reinforced concrete combined bridge deck schematic diagram constitutes figure；
Fig. 7 is bridge deck concrete surface layer and steel plate engaging portion schematic diagram；
Fig. 8 acts on the intensity of solar radiation on floorings when being summer；
The floorings surface temperature result of measuring point 1 and measuring point 2 when Fig. 9 is summer；
The floorings surface temperature result of measuring point 3 and measuring point 4 when Figure 10 is summer；
The floorings surface temperature result of measuring point 5 and measuring point 6 when Figure 11 is summer；
Vertical Temperature Gradient result when Figure 12 is summer at measuring point 3；
Figure 13 acts on the intensity of solar radiation on floorings when being winter；
The floorings surface temperature result of measuring point 1, measuring point 2 and measuring point 3 when Figure 14 is winter；
Vertical Temperature Gradient result when Figure 15 is winter at measuring point 3；
Figure 16 is a kind of structural schematic diagram of civil engineering structure solar radiation temperature-effect analysis system.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, is not used to limit
The fixed present invention.
This implementation determines the geographic logitude and latitude of structure position first.Further using sensing device measurement knot
The ambient air temperature and surface wind speed in structure location.The direct spoke of structure is determined based on the structure solar radiation model proposed
Penetrate intensity, scattering strength and reflected intensity.The intensity of solar radiation that civil structure surface is acted on according to analysis gained, establishes temperature
Spend boundary condition, using finite element method structure Equations of Three-dimension i.e. can determine civil engineering structure surface and its
The dynamic temperature effect of internal any point.Solar radiation temperature-effect analysis method in the present embodiment solves conventional method
Accuracy of identification is not high, the peak temperature moment has differences, structure heating and temperature-fall period and the defect that actually misfits.
Civil engineering structure solar radiation temperature-effect analysis method is established in particular by following steps:
Step 1: the beam radia intensity of body structure surface is established
Due to the effect of atmosphere, Globalradiation intensity I suffered by civil structure surface is consisted of three parts: (1) being come
From the constant light beam radiation in the direction of the sun or direct solar radiation I1；(2) from sky, due to atmosphere reflection and dissipate
It penetrates and the changed part solar radiation in direction is formed by solar scattered radiation I2；(3) after solar radiation reaches ground
It is reflected into the ground return radiation I of body structure surface3。
I=I1+I2+I3
For some day for needing research structure radiation temperature effect, its day ordinal number n started from January 1 is determined.
Under sun vertical irradiation, the direct solar radiation I of civil structure outer surface1It may be expressed as:
I1=ScCa
In formula: calculating the solar constant S of some day (n-th day started from January 1) of temperature effectcIt may be expressed as:
The atmospheric transparency coefficient C in structure locationaIt may be expressed as:
Wherein: paFor the atmosphere relative barometric pressure of this day；maFor optical air mass.Turbidity coefficients CcWith atmospheric condition and season
Section variation, it can be calculated by empirical equation:
In formula: κ1And κ2For topography and geomorphology parameter, value can be chosen according to different landforms.
The path length that sunray passes through atmosphere is characterization solar radiation by the important parameter of atmospheric attenuation degree.It is logical
Often metering light path and do not have to physical length but optical air mass maIt indicates.Optical air mass and solar elevation ψ
It is related:
The path length that sunray passes through atmosphere is characterization solar radiation by the important parameter of atmospheric attenuation degree.If
When the inclination angle of sunray and body structure surface is θ, direct solar radiation intensity be may be expressed as:
I1=ScCacosθ
Step 2: the solar scattered radiation intensity of body structure surface is established
Test observation shows: sky scattering substantially evenly projects earth surface, therefore sky suffered by body structure surface
Scattering is unrelated with surface orientation angle, only related with surface angle.Scattering strength on horizontal plane may be expressed as:
In formula:
The diffusesolarradiation on inclined-plane for being β at inclination angle may be expressed as:
Step 3: the sun reflected radiation of body structure surface is established
After solar radiation (including directly radiate and scatter) projects earth's surface, by some by earth surface reflection, i.e. earth's surface
Shortwave reflection, the reflected radiation for projecting body structure surface are represented by
I3=Cr(I1+I2)
In formula: CrFor earth's surface shortwave reflectivity factor.The reflected solar radiation intensity on inclined-plane for being β at inclination angle can indicate
Are as follows:
Step 4: the intensity of solar radiation factor of body structure surface is established
The specific location of the sun of sky can be by solar elevation ψ and azimuth γsIt determines, as shown in Figure 2.Altitude of the sun
Angle ψ and azimuth γsLatitude ε with hour angle ω, solar declination δ and structure location be it is related, solar elevation ψ can
It is calculated by following relationship:
T when then day is sunny1With t when the sunset sun2It can respectively indicate are as follows:
The time span that body structure surface bears solar radiation in one day can be calculated:
ts=t2-t1
T at the time of peak value intensity of solar radiation astronomically occurs0Are as follows:
It is obtained when the solar peak value radiation intensity of body structure surface represented by above formula based on traditional astronomy model.For
For practical civil engineering structure, it can not match in many cases with the intensity of solar radiation suffered by practical structures,
This is mainly due to the influences of day scattered cloud layer, structure landforms, trees, building vehicle etc. in the air.In fact, body structure surface by
To maximum intensity solar radiation at the time of tmSometimes and above formula result of getting along well is consistent.Moment tmIt is possible that than moment t0Slightly
Micro- lag.Further, since the influence of aforementioned natural environment, acts on the intensity of solar radiation on civil engineering structure surface in the morning
With afternoon and unequal, this is inconsistent with the astronomical model of tradition.It is therefore desirable to establish to be suitable for civil structure
Solar radiation model.At, the intensity of solar radiation factor be can be expressed as at the moment in the morning:
The time coefficient t in the morningk1It may be expressed as:
tk1=t2-t1+2(tm-t0)
Moment in the afternoon, the intensity of solar radiation factor can be expressed as:
The time coefficient t in afternoonk2It may be expressed as:
tk2=2 (t2-tm)
In formula: t indicates the solar radiation moment；A and b is two positive correction factors, and numerical value can be according to practical feelings
Condition is chosen.
Therefore, the i-th moment in one day, the intensity of solar radiation for acting on civil structure may be expressed as:
Step 5: the solar radiation model for being directed to civil engineering structure is established
In traditional astronomy solar radiation model, component surface received intensity of solar radiation summation in one day are as follows:
New solar radiation model, the intensity of solar radiation summation that component surface receives in one day are as follows:
The intensity of solar radiation error of the two are as follows:
After modifying factor, can the solar radiation total amount to model be modified, can guarantee in this way total in one day
Solar radiation quantity remains unchanged.The overall strength of structure solar radiation model may be expressed as:
Icivil=Im·(1-Se0)
Step 6: the solar radiation effect analytical calculation of civil engineering structure
Geographical location and its orientation, the sun locating for civil structure concrete roof structure system time varying temperature field and structure
The many factors such as environment locating for radiation intensity, atmospheric temperature and wind speed and works are related.Structure outer boundary is mainly logical
Convection current and radiation is crossed to carry out thermal energy transmitting with ambient enviroment and exchange.Radiation effects is different according to the length of wave, can be divided into length
Wave radiation and shortwave radiation.Shortwave radiation is solar radiation, and long-wave radiation is mainly heat radiation, although long-wave radiation intensity ratio
Shortwave radiation is much smaller, but is mainly heat radiation in the heat exchange of night time configuration outer boundary and ambient enviroment.Civil structure appearance
Energy exchanging rate U between face and atmospheric environment may be expressed as:
U=U1+U2+U3
In formula: U1For heat convection energy input；U2For long-wave radiation energy input；U3For solar radiation energy input.
Heat (i.e. shortwave radiation) U that body structure surface is obtained by solar rays3It can indicate are as follows:
U3=α Icivil
In formula: α (0 < α < 1) α is body structure surface radiation absorption factor, for generally the concrete surface of processing not being added to take
0.5 or 0.65, asphalt pavement layer surface desirable 0.85 or 0.9.
Convective heat exchange U1Dependent on speed air flow and boundary condition, may be expressed as: by the newton law of convection
U1=e1(Ta-Ts)
In formula: e1For heat exchange coefficient；TsFor civil structure surface temperature；TaFor the ambient air temperature of actual measurement.It is right
Stream heat exchange coefficient is usually calculated by test formula:
e1=4.0v+5.8
In formula: v is the body structure surface wind speed of actual measurement.
The heat exchange U generated between civil structure surface and atmospheric environment with the forms of radiation of long wave2It can be by Stefan-
Boltzman law indicates are as follows:
U2=e2(Ta-Ts)
In formula: e2For radiation heat transfer coefficient:
e2=es·[4.8+0.075(Ta-5)]
In formula: esFor material surface emission ratio.Comprehensive aforementioned result, the energy between civil engineering structure and atmospheric environment
Amount exchange rate U may be expressed as:
U=e (Ta-Ts)+αIcivil
Equivalent heat exchange coefficient e may be expressed as: in formula
E=ec+er
Thus preceding formula can be exchanged into following formula:
Above formula gives a kind of simplified expression of civil engineering structure equivalent temperature boundary condition, i.e. the heat of body structure surface passes
The process of passing is represented by body structure surface temperature TsWith equivalent temperature T*Between thermal convection process.
U=e (T*-Ts)
Equivalent temperature T*Influence comprising air themperature and solar radiation, such heat convection and solar radiation
The form of unified thermal boundary condition is introduced into Temperature calculating.
The temperature effect problem of civil engineering structure belongs to three-dimensional heat conduction problem, can be based on thermodynamics three-dimensional heat transfer side
Cheng Caiyong finite element method is solved.According to Fourier heat transfer theory, the Equations of Three-dimension of structure are as follows:
In formula: T is the temperature of structure point；kx,kyAnd kzFor the material thermal conductivity of three orthogonal directions；ρ is that material is close
Degree；C is material specific heat.By solving above formula and considering thermal boundary condition, that is, it can determine the solar radiation temperature effect of engineering structure
It answers.By above-mentioned series of steps, civil engineering structure can be realized in the analysis and assessment of solar radiation temperature effect.
Illustrate the validity of rigidity of structure damage monitoring method and system of the invention with several concrete cases below.This
Case investigates the solar radiation temperature-effect analysis process and analytical calculation effect of certain bridge structure floorings.
Fig. 3 is the schematic diagram of certain large bridge structure, and it is regional which is located at coastal areas of southern China, belong to the tropic of Capricorn with
Southern area.Using the structure as object, the implementation process of structure solar radiation temperature-effect analysis method and system is described.The bridge
More than 1000 meters of beam main span, there are two end bays for two sides.This kind of Longspan Bridge generallys use steel box-girder section, and Fig. 4 gives steel case
The cross-sectional view of beam.The steel box-girder is made of multiple steel frames and bracing members known to result in figure.In upper and lower bridge floor
On be covered with floorings to realize vehicle pass-through.
Fig. 5, Fig. 6 and Fig. 7 give the schematic diagram of floorings.Floorings are made of the steel plate with U rib, steel plate top
Mating formation has the asphalt concrete pavement of 38mm.Steel plate thickness is 14mm, and U rib thickness is 10mm.Table 2 gives floorings and respectively forms
Partial material characteristic parameter.In order to investigate implementation result of the invention, 6 measuring points are had chosen in bridge steel box-girder truncation,
Analyze the difference of observed temperature field Yu analytical calculation temperature field, while the high spot reviews change of the Vertical Temperature Gradient of floorings
Change feature and rule.Wherein measuring point 1 to 4 is the temperature point of upper surface floorings, and measuring point 5 is lower surface floorings measuring point, is surveyed
Point 6 is the measuring point of steel box-girder side surface enclosure board.
Table 1
Fig. 8 gives structural radiation model proposed by the present invention and the obtained bridge floor plate surface of the astronomical radiation patterns of tradition
Intensity of solar radiation result compares, and structure temperature effect is thought of as summer, and the specific time is July 1.From Fig. 8 result: passing
The system obtained radiation intensity of astronomy radiation patterns is etc. to be uniformly distributed in morning and afternoon, and radiation intensity peak value is noon 12
When.And structural radiation model is by the adjustment of modifying factor, radiation intensity morning and afternoon is slightly different, and radiation intensity peak value occurs
At about 13 points.
Fig. 9 and Figure 10 gives the time varying temperature analysis result of four measuring points of bridge truncation top floorings and actual measurement is tied
The comparison of fruit.By result in figure it is found that the peak temperature of the bridge floor plate surface of actual measurement appears in about at 16 points in afternoon.Measured result is
Heating is constantly in front of 16 points, then thermal energy input reaches balance with output, and temperature reaches peak value.Subsequent thermal energy input is big
In output, therefore floorings surface temperature starts to be gradually reduced.And analysis based on traditional astronomy radiation patterns the result shows that,
Its peak temperature appears in about at 14 points in afternoon, and 2 hours have been differed with measured result.And analysis temperature-rise period and cooled down
There is also larger differences for journey and measured result.And the result based on traditional astronomy radiation patterns is already complete before 14 points
At temperature-rise period, then start to cool down, this is not obviously inconsistent with measured result.And use structural radiation mould proposed by the present invention
Type, can accurately describe structure among one day time varying temperature variation, the peak temperature moment and heating temperature-fall period with
Measured result coincide.
Figure 11 gives the analysis result of measuring point 5 and measuring point 6 compared with measured result.By result in figure it is found that using
The lower part floorings and peripheral backplate time varying temperature field and measured result that structural radiation model obtains coincide preferable.Figure 12 is provided
The steel plate of the position of measuring point 3 and the Vertical Temperature Gradient of asphalt concrete pavement layer analyze result.The result shows that: due to
The installation of asphalt concrete pavement effectively blocks the transmitting of the vertical thermal energy of the structure due to caused by solar radiation, pave-load layer
There are apparent temperature differences for upper and lower surface, and temperature difference is up to 12 degree or so.And steel plate is since thermal coefficient is big, following table thereon
The temperature difference very little in face.
The situation of change of the aforementioned time varying temperature field under summer high-temperature intense radiation that gives floorings.In order to verify this hair
The validity of bright proposed analysis model and method, structure dynamics temperature field when being investigated temperature minimum winter herein
Situation.Figure 13 gives the intensity of solar radiation knot of structural radiation model and the obtained bridge floor plate surface of the astronomical radiation patterns of tradition
Fruit is compared, and structure temperature effect is thought of as winter, and the specific time is January 1.The intensity of solar radiation comparing result and figure in winter
The conclusion of the summer of 8 displays is similar.From Figure 13 result: traditional obtained radiation intensity of astronomy radiation patterns is upper and lower
Noon is etc. to be uniformly distributed, when radiation intensity peak value is noon 12.And structural radiation model passes through the adjustment of modifying factor, spoke
Penetrating intensity morning and afternoon is slightly different, and radiation intensity peak value appears at about 13 points.
Figure 14 gives the comparison of time varying temperature the analysis result and measured result of measuring point 1,2 and 3 in winter.Obviously with
The result of summer is similar, is coincide very well, can accurately be described using the time varying temperature field of structural radiation model and measured result
The time varying temperature variation of structure among one day, peak temperature moment and heating temperature-fall period coincide with measured result.And it adopts
With traditional astronomy radiation patterns acquired results no matter the peak temperature moment or heating cooling overall process with actual measurement exist
Different.
The Vertical Temperature Gradient of the steel plate and asphalt concrete pavement layer of 3 position of measuring point point when Figure 15 gives winter
Analyse result.The result shows that: asphalt concrete pavement effectively blocks the biography of the vertical thermal energy of the structure due to caused by solar radiation
It passs.Pave-load layer upper and lower surface is there are apparent temperature difference, and temperature difference is up to 7 degree or so when winter.And the upper and lower surface of steel plate
Temperature difference very little.
Its concrete function of modules in the new civil engineering structure solar radiation effect analysis system of one kind of the invention
Realization above-mentioned method can be used.
As shown in figure 16, a kind of civil engineering structure solar radiation temperature-effect analysis system, comprising:
Structural environment temperature monitoring module, for passing through the ambient air temperature and surface wind of sensing device measurement structure
Speed；
Structural environment air monitoring module, for the wind speed of real-time monitoring structural perimeter, acquisition acts on body structure surface
Wind speed information；
Structure intensity of solar radiation analysis module, for according to structure position, determination to act on structural outer surface
Direct radiation intensity, scattering strength and reflected intensity；
Structure temperature boundary condition analysis module, for according to the physical parameter of structure and the surface for acting on structure
Direct radiation intensity, scattering strength and Reflection intensity information, establish the thermal boundary condition for being suitable for structure temperature effect analysis；
Structure solar radiation temperature-effect analysis assessment module, for strong according to the body structure surface solar radiation having built up
Degree and thermal boundary condition, determine the thermo parameters method and temperature effect of any position in structure.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (4)
1. a kind of civil engineering structure solar radiation temperature-effect analysis method, which comprises the following steps:
1) pass through the ambient air temperature and surface wind speed of sensing device measurement structure, the ambient air temperature and surface wind speed
Information is for calculating the coefficient of heat transfer；
2) according to the geographic logitude and latitude of structure position, the sun for calculating any moment in structure position one day is high
Spend angle；Then it is calculated using structure solar radiation model and determines the intensity of solar radiation for acting on body structure surface, specific as follows:
2.1) the i-th moment in one day is set, the intensity of solar radiation of civil structure is acted onAre as follows:
Wherein,
Wherein: tsThe time of solar radiation is born for body structure surface in one day；tk1For morning time coefficient；tk2For system the time in the afternoon
Number；t1And t2Respectively day at sunny moment and sunset sun moment；tmSolar radiation for body structure surface by maximum intensity
Moment；T indicates the solar radiation moment；A and b is the coefficient of radiation patterns；2.2) solar radiation for acting on civil structure is determined
Intensity Icivil:
Icivil=Im·(1-Se0)
Se0For the intensity of solar radiation error of two kinds of results:
Wherein: SIFor the intensity of solar radiation summation being subject in one day using traditional resulting body structure surface of solar radiation model；
SImFor the intensity of solar radiation summation being subject in one day based on the modified resulting body structure surface of structure solar radiation model；
Wherein: IiFor Globalradiation intensity suffered by the i-th moment civil structure surface；siFor the i-th moment intensity of solar radiation
The factor；t1And t2When respectively day is sunny and when the sunset sun；
3) according to the physical parameter of structure and direct radiation intensity, scattering strength and the reflected intensity on the surface for acting on structure
Information establishes the dynamic temperature boundary condition for being suitable for structure temperature effect analysis；
4) according to the body structure surface intensity of solar radiation and thermal boundary condition having built up, the temperature of any position in structure is determined
Spend field distribution and temperature effect.
2. civil engineering structure solar radiation temperature-effect analysis method according to claim 1, which is characterized in that described
Dynamic temperature boundary condition suitable for structure temperature effect analysis are as follows:
U=e (T*-Ts)
In formula: energy exchanging rate of the U between structural outer surface and atmospheric environment；E is equivalent heat exchange coefficient；T*For equivalent temperature
Degree；TsFor civil structure surface temperature；TaFor the ambient air temperature of actual measurement；α is body structure surface radiation absorption factor.
3. civil engineering structure solar radiation temperature-effect analysis method according to claim 1, which is characterized in that described
The thermo parameters method of any position and temperature effect are determined by solving the Equations of Three-dimension of structure in structure.
4. civil engineering structure solar radiation temperature-effect analysis method according to claim 1, which is characterized in that described
S in step 2.2)IIt is to determine beam radia intensity, the reflected radiation of body structure surface based on traditional astronomy radiation patterns
Intensity and scattering radiation intensity, then obtain the total radiation intensity of structure.
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| CN108319792B (en) * | 2018-02-09 | 2021-03-23 | 中国水利水电科学研究院 | Finite element simulation sun ray shading calculation method |
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| CN111460545B (en) * | 2020-03-11 | 2022-05-31 | 华中科技大学 | Method and system for efficiently calculating temperature strain of super high-rise structure |
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