CN103577652B - Cross-sea bridge wind barrier designing method - Google Patents
Cross-sea bridge wind barrier designing method Download PDFInfo
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Abstract
The invention belongs to the technical field of structural engineering, and particularly relates to a cross-sea bridge wind barrier designing method. A bridge floor wind speed field model with a wind barrier and a bridge floor wind speed field model without the wind barrier are established respectively by combining wind tunnel tests and numerical wind tunnels, the simulated height and simulated ventilation ratio of the wind barrier in the bridge floor wind speed field models are changed constantly, the bridge floor equivalent wind speed and the wind speed reduction factor are calculated and compared with the traffic safety wind speed of typical vehicle types, and the height and the ventilation ratio of the wind barrier in safety are the height and the ventilation ratio of the wind barrier needing to be designed. According to the cross-sea bridge wind barrier designing method, when the wind barrier of a cross-sea bridge is designed, conventional factors are taken into consideration, and the influences of multiple wind directions and the influences of multiple bridge types are also proposed to be taken into consideration. Meanwhile, the measure of combining the wind tunnel tests and the numerical wind tunnels is adopted to determine the wind speed fields and obtain the height and the ventilation ratio of the wind barrier, the wind barrier is then designed, and thus the designed wind barrier is more reasonable, more economical, and capable of practically meeting the engineering requirements and powerfully ensuring traffic safety.
Description
Technical field
The invention belongs to technical field of structural engineering is and in particular to a kind of bridge spanning the sea wind barrier design method.
Background technology
With scientific and technical development, for promoting straits economic construction, using the teaching of the invention it is possible to provide the bridge spanning the sea of convenient traffic corridor,
Obtain swift and violent development in China with all over the world, in order to avoid deep water foundation and meet the navigation of large ship and require, greatly
Span bridge's structure will become the contenders of sea-crossing engineering embodiment with the combination of marine long bridge, but Oversea bridge institute
The special natural wind environment at place often causes totally unfavorable impact to the traffic safety of super-long span bridges.
Automobile is in the process of moving if subjected to side wind action, it may occur however that the safety problem such as break away, roll, affects car
Safety traffic.Especially on ultra-large type bridge travel automobile, due to bridge elevation, structure flow-disturbing accelerate etc. factor so that
The impact problem to vehicle safety travel for the wind becomes especially prominent.The impact to traffic safety for the wind is also manifested by charming appearance and behaviour accident and causes
Traffic jam for a long time.
Wind barrier is the Main Means solving bridge floor traffic safety and comfortableness problem, especially under extreme crosswind effect,
Wind barrier can effectively ensure that the safety that light vehicle travels.Determine in science of bridge building whether be a complicated class using wind barrier
Topic, it requires to consider that natural wind condition, vehicle launch performance, bridge structure wind resisting stability, and traffic engineering management etc. are comprehensive
Conjunction factor, some of which factor may collide with each other.The bridge spanning the sea wind barrier design technology of domestic employing at present mainly considers
The impact of the conventional factors such as wind speed, wind direction, the comprehensive study to the many bridge types of many wind directions not deep enough it is difficult to accomplish to gear to actual circumstances
Economical rationality,
In sum, the impact to vehicle driving safety for the wind barrier carries out research and has very important significance, and how to set
Meter wind barrier considers that many factors are current problem demanding prompt solutions.
Content of the invention
The purpose of the present invention is exactly to solve the deficiency that above-mentioned background technology exists, providing a kind of consideration many wind directions impact
The many bridge types of appropriate design the bridge spanning the sea wind barrier design method that combines with Numerical Wind Tunnel of test.
The technical solution used in the present invention is：A kind of bridge spanning the sea wind barrier design method, comprises the following steps：
（1）, set up respectively by wind tunnel test and Numerical Wind Tunnel, calm barrier when bridge floor wind speed field model, analysis
Bridge floor wind speed field, the two be combined with each other, verifies, compares, and constantly changes the wind barrier that bridge floor wind speed field model middle mold is intended simultaneously
Height and ventilative rate；
（2）, calculate vehicle pass through bridge floor wind speed field model when bridge floor equivalent wind speed and wind speed reduction coefficient, and with typical case
The traffic safety wind speed of vehicle compares；
（3）, in the bridge floor equivalent wind speed calculating when vehicle passes through bridge floor wind speed field model and while wind speed reduction coefficient,
Record bridge floor wind speed field model middle mold intends the height of wind barrier and ventilative rate；
（4）, by the vehicle that calculates by the bridge floor equivalent wind speed of bridge floor wind speed field model and wind speed reduction coefficient and allusion quotation
The traffic safety wind speed of type vehicle compares, and judges to simulate the bridge floor wind speed field model whether safety having wind barrier；
（5）If, step（4）It is safe that middle judgement simulation has the bridge floor wind speed field model of wind barrier, then now simulate
The height of wind barrier and ventilative rate are the height of wind barrier of required design and ventilative rate；Otherwise repeat step（1）-（4）；
（6）, the height of wind barrier obtaining and ventilative rate design qualified wind barrier according to simulation.
Further, described step（1）In combined by wind tunnel test and Numerical Wind Tunnel the bridge floor wind speed field mould of foundation
Parameter in type includes different automobile types, different road surface, different load-carrying, different bridge types and their combination in any.
Further, described step（2）In equivalent wind speed computing formula be：Or
Wherein：V (z) and V (zi) it is respectively bridge floor height z and ziThe lateral arrives stream wind speed at place；ZeHeight model for automobile
Enclose；N is along automobile height measuring point quantity.
Further, described step（2）Middle wind speed reduction coefficient is that the equivalent wind speed of bridge floor laterally to flow wind with reality
The ratio of speed.
The present invention, when designing the wind barrier of bridge spanning the sea, not only considers the factor of routine, and proposes to consider many wind directions
With the impact of many bridge types, meanwhile, determine bridge floor wind speed field using the means that wind tunnel test and Numerical Wind Tunnel combine, obtain air-out screen
The height of barrier and two parameters of ventilative rate, and then design wind barrier, the wind barrier so designed is more reasonable, more economical, can
Effectively meet engine request, powerful guarantee traffic safety.
Brief description
Fig. 1 is the wind barrier parameter designing schematic diagram of the present invention.
Fig. 2 is the computation model main body figure of typical bridge section I
Fig. 3 is the computation model main body figure of typical bridge section II
Fig. 4 is that when microbus zero load, limiting vehicle speed 100km/h, the bridge floor traffic safety wind speed under different wind angles shows
It is intended to.
Fig. 5 is that when microbus zero load, limiting vehicle speed 80km/h, the bridge floor traffic safety wind speed under different wind angles shows
It is intended to.
Fig. 6 is that when microbus zero load, limiting vehicle speed 60km/h, the bridge floor traffic safety wind speed under different wind angles shows
It is intended to.
Fig. 7 is the relation schematic diagram to flow wind direction and reduction coefficient.
Specific embodiment
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings, is easy to be well understood to this
Bright, but they do not constitute restriction to the present invention.
As shown in figure 1, the bridge spanning the sea wind barrier design method of the present invention is mainly designs the height of wind barrier and ventilative
This two parameters of rate, determine that this two parameters of wind barrier are then to combine to determine by wind tunnel test and Numerical Wind Tunnel.
Using wind tunnel test, bridge spanning the sea model is fixed in wind-tunnel, set up have, calm barrier when bridge floor wind speed field
Model, simulates bridge floor environment, analyzes bridge floor wind speed field.Simultaneously on computers using Numerical Wind Tunnel set up have, calm barrier when
Bridge floor wind speed field Three-dimension Numerical Model, analyze bridge floor wind speed field, the analog result of wind tunnel test and Numerical Wind Tunnel is compared,
Result is closer to illustrate both consider the principal element of impact wind environment, and illustrates at each bridge section of bridge spanning the sea
In more identical environment.Different angles flowing the different wind environment around bridge that wind causes by the rule testing acquisition, in three dimensions
It is used in value simulation
It is considered to the impact of various factors during simulation bridge floor environment, bridge floor wind speed field model arranges various vehicles not
Same road surface, different load-carrying, the parameter at different bridge type, each parameter are combined, then constantly change bridge floor wind speed field model middle mold
The height of wind barrier intended and ventilative rate, calculate vehicle in the model under different parameters and pass through bridge during bridge floor wind speed field model
Face equivalent wind speed and wind speed reduction coefficient, record corresponding bridge floor wind speed field model middle mold simultaneously and intend the height of wind barrier and ventilative
Rate, by the equivalent wind speed calculating and wind speed reduction coefficient compared with the traffic safety wind speed of typical vehicle.Until certain is first-class
Effect wind speed and wind speed reduction coefficient in the range of driving survival wind speed, then have the bridge floor wind speed field of wind barrier in this parameter Imitating
It is safe that model corresponds in practical situation, and the height of wind barrier now simulated and ventilative rate are the required wind screen designing
The height of barrier and ventilative rate, the height of the wind barrier obtaining finally according to simulation and ventilative rate design qualified wind barrier.
Concrete steps, implementation are as described below：
The first step：Determine that typical bridge section sets up wind tunnel test and numerical value wind tunnel model according to bridge feature, analyze bridge floor wind
Fast field, and analyze the bridge floor wind speed field of different size wind barrier.The operating mode setting up model includes the calm barrier of typical bridge floor and sets
Put wind barrier.Accordingly, it is determined that typical bridge section I and typical bridge section II respectively as shown in Figure 2 and Figure 3.The height of wind barrier is selected
Two kinds, that is, 3m, 4m are high.The air partition of every kind of height has three kinds of ventilative rates again, and that is, 50%, 60%, 70% 3 kind of situation.So, wind barrier
Specification have six kinds.
Second step：Determine typical vehicle, analyze safety traffic wind speed under different wind angles for the different automobile types.According to first
Walk the Numerical Wind Tunnel of typical bridge section establishing and model in wind tunnel, the equivalent wind speed of analysis and test bridge floor and wind speed reduction
Coefficient, and compared with the traffic safety wind speed of typical vehicle.
Use for reference the vehicular traffic status investigation result on China's major highways arterial highway, and the profile chi according to vehicle
Very little, quality and aerodynamic characteristic feature etc., determine that representational vehicle is divided into following four：Car, microbus（Or low profile
Hired car）, transportation medium truck（Or middle bus）, van container trailer, representative vehicle be Toyota Crown car, Chang'an it
Star, graceful board lorry and Baker trailer.Aerodynamic coefficient according to typical vehicle and bridge floor Parameter analysis, obtain different wind directions with
After inclination under angle between vehicle body and sideslip critical wind velocity and lateral deviation critical wind velocity, therefrom select the critical wind of minimum
Speed, you can obtain bridge floor traffic safety wind speed, be shown in Table 1.
Taking microbus as a example, shown in Fig. 4-6 be when car is unloaded in the case of the different speed limits under different wind angles
Vehicle safe driving wind speed.As seen from the figure, minimum traffic safety wind speed, at 60 degree to 80 degree, is not that we often recognize
For come to flow wind perpendicular to bridge floor when, therefore, bridge floor setting wind barrier to consider to flow the impact of wind angle, and can not using come
Stream wind perpendicular to bridge floor when setting wind barrier checking coefficient, so design wind barrier be relatively dangerous.
Bridge spanning the sea bridge floor traffic safety wind speed (m/s) under different pavement states for the table 1
The typical bridge section model establishing, sets up the three-dimensional finite element model of typical bridge section I and II, root using Numerical Wind Tunnel
According to equivalent wind speed computing formula：OrAcquisition bridge can be calculated
The equivalent wind speed in face, obtains wind speed reduction coefficient further, V (z) and V (z in formulai) it is respectively bridge floor height z and ziThat locates is lateral
Arrives stream wind speed；ZeAltitude range for automobile；N is along automobile height measuring point quantity.
In the case of only guardrail, arrives stream wind speed be 30m/s when, the equivalent wind speed in typical bridge section I and each track of II and
Reduction coefficient is as shown in table 2 and table 3.
Table 2 only has the equivalent wind speed of typical bridge section I and reduction coefficient during guardrail
| 1m | 2m | 3m | 4m | 4.5m | 5m | Equivalent wind speed | Reduction coefficient | |
| 1 track | 28.5 | 37 | 38 | 38 | 38.2 | 38 | 35.8976 | 1.1966 |
| 2 tracks | 28 | 36 | 37.5 | 37.5 | 37.5 | 37.5 | 35.2629 | 1.1754 |
| 3 tracks | 27.5 | 35 | 37 | 37 | 37 | 37 | 34.6530 | 1.1551 |
| 4 tracks | 20.5 | 36 | 37.5 | 37.5 | 37.8 | 37.5 | 34.1343 | 1.1378 |
| 5 tracks | 23.5 | 36 | 37.5 | 38 | 38.4 | 38 | 34.7556 | 1.1585 |
| 6 tracks | 25 | 35 | 36.5 | 37 | 37.3 | 37 | 34.1464 | 1.1382 |
Table 3 only has the equivalent wind speed of typical bridge section II and the reduction coefficient of guardrail
| 1m | 2m | 3m | 4m | 4.5m | 5m | Equivalent wind speed | Reduction coefficient | |
| 1 track | 5 | 3.5 | 26 | 43 | 45 | 43 | 28.1849 | 0.9395 |
| 2 tracks | 6 | 5 | 9 | 35 | 46.3 | 44 | 23.2802 | 0.7760 |
| 3 tracks | 7.5 | 7.5 | 7 | 16 | 36.8 | 43 | 15.5964 | 0.5199 |
| 4 tracks | 10 | 7.5 | 8 | 22.5 | 32.1 | 39 | 16.6113 | 0.5537 |
| 5 tracks | 13 | 10 | 12.5 | 28 | 36.4 | 40 | 20.3946 | 0.6798 |
| 6 tracks | 15.5 | 10 | 21.5 | 33 | 36.9 | 40 | 23.9086 | 0.7970 |
In wind tunnel test, in the case that typical bridge section II only has guardrail, when arrives stream wind speed is 6.8m/s, each track etc.
Effect wind speed and reduction coefficient are as shown in table 4.
Table 4 only has the equivalent wind speed of standard paragraphs and the reduction coefficient of guardrail
| 5m | 4.5m | 4m | 3m | 2m | 1m | Equivalent wind speed | Reduction coefficient | |
| 1 track | 7.1934 | 7.3170 | 7.1885 | 7.7434 | 6.2113 | 3.3276 | 6.4646 | 0.9507 |
| 2 tracks | 7.0088 | 6.5796 | 6.8725 | 6.8851 | 4.6024 | 2.4365 | 5.6451 | 0.8302 |
| 3 tracks | 7.3184 | 7.3307 | 7.1620 | 7.1736 | 5.3745 | 4.9770 | 6.3819 | 0.9385 |
| 4 tracks | 7.0508 | 7.1303 | 6.6642 | 5.7931 | 5.7848 | 4.7114 | 5.9452 | 0.8743 |
| 5 tracks | 6.8133 | 6.617 | 6.3443 | 6.1459 | 4.8776 | 4.7679 | 5.7046 | 0.8389 |
| 6 tracks | 7.0084 | 6.923 | 6.7569 | 6.8857 | 5.4022 | 5.9125 | 6.3452 | 0.9331 |
The reduction coefficient of three-dimensional numerical value simulation of wind compares close with the reduction coefficient of wind tunnel test, and three-dimensional numerical value wind is described
The analog result of field is rational, has been considered in the principal element of impact wind field interior, has used it to analyze bridge floor wind field base
It is relatively safe in basis.
According to the bridge floor wind speed reduction coefficient in the case of the only guardrail that wind tunnel test and Numerical Wind Tunnel determine, analyze each
The safety traffic wind speed of typical vehicle, is converted into local weather station wind scale, from the point of view of annual strong wind natural law at bridge site, in limit
For in the case of 60km/h, microbus type will have and can not go up bridge less than 300 days speed for 1 year, and middle Light-duty Vehicle type will have for 1 year
Bridge can not be gone up less than 180 days, container-trailer type will have about 180 days and can not go up bridge for 1 year, and coupe style is less than for 1 year
Bridge can not be gone up within 90 days.If being not provided with wind barrier, it will substantially reduce the utilization rate of this bridge.Therefore, it is necessary in bridge spanning the sea
Bridge floor arranges wind barrier.
3rd step：During analysis bridge floor setting different size wind barrier, that is, during the wind barrier of differing heights and different ventilative rate
The wind speed reduction coefficient of each typical case's bridge section.Such as each during 90 degree of wind angle in Numerical Wind Tunnel analysis than more typically bridge section I and II
The checking coefficient in track in only guardrail, the setting high 50% ventilative rate of 3m, the high 70% ventilative rate of 3m and the high 50% ventilative rate of 4m, or
Than the checking coefficient in more typically bridge section II each track during 90 degree of wind angle in wind tunnel experiment, in only guardrail, setting, 3m is high by 50%
The high 60% ventilative rate of ventilative rate, 3m, the high 70% ventilative rate of 3m and the high 50% ventilative rate of 4m.
4th step：Calculate when arranging wind barrier, the bridge floor equivalent wind speed of bridge floor wind speed field model and wind speed reduction coefficient
Compared with the traffic safety wind speed of typical vehicle, judge that can arrange this specification wind barrier meet each typical vehicle security row
Sail.
According to second step analysis, when to flow wind direction and become 70 degree with bridge floor angle, the survival wind speed of vehicle traveling is substantially
Minimum, therefore, select wind angle to be to analyze under the wind barrier of all size as least favorable wind angle when 70 degree first
Vehicle safe driving wind scale, meet the wind barrier of engine request to determine.Then check the wind barrier of setting selection then,
When, the vehicle safe driving wind scale under other wind directions.Finally, comprehensive above analysis, determines and arranges wind screen in typical bridge section II
The specification of barrier.
When to flow wind direction and become 70 degree with bridge floor angle, the no air partition bridge floor survival wind speed of each typical case's vehicle is as shown in table 5.
Survival wind speed under table 5 different automobile types and different speed limit
（a）Operating mode one：Wind barrier height 3m, ventilative rate 50%.
By analysis, the numerical simulation in conjunction with bridge floor wind field and the result of wind tunnel test, wind speed reduction system under this operating mode
Number is 0.6077, and the safety traffic wind speed under each typical case's vehicle different speed limits at bridge floor is as shown in table 6.
Survival wind speed under table 6 different automobile types and speed limit（Arrives stream wind speed at bridge floor）
（b）Operating mode two：Wind barrier height 3m, ventilative rate 60%
This operating mode wind speed reduction coefficient is 0.6159, and the survival wind speed under typical car difference speed limit is as shown in table 7.
Survival wind speed under table 7 different automobile types and speed limit（Arrives stream wind speed at bridge floor）
（c）Operating mode three：Wind barrier height 3m, ventilative rate 70%
By analysis, the numerical simulation in conjunction with bridge floor wind field and the result of wind tunnel test, the wind speed reduction system under this operating mode
Number is 0.6701, and each typical case's survival wind speed under the different speed limits at bridge floor height for the vehicle is as shown in table 8 below.
Survival wind speed under table 8 different automobile types and speed limit（Arrives stream wind speed at bridge floor）
（d）Operating mode four：Wind barrier height 4m, ventilative rate 50%
Numerical simulation in conjunction with bridge floor wind field and the result of wind tunnel test, the wind speed reduction coefficient under this operating mode is
0.4675, each typical case's survival wind speed under the different speed limits at bridge floor height for the vehicle is as shown in table 9 below.
Survival wind speed under table 9 different automobile types and speed limit（Arrives stream wind speed at bridge floor）
（e）Operating mode five：Wind barrier height 4m, ventilative rate 60%
Analyze the numerical simulation of bridge floor wind field and the result of wind tunnel test, the wind speed reduction coefficient under this operating mode is
0.5029, each typical case's survival wind speed under the different speed limits at bridge floor height for the vehicle is as shown in table 10 below.
Survival wind speed under table 10 different automobile types and speed limit（Arrives stream wind speed at bridge floor）
（f）Operating mode six：Wind barrier height 4m, ventilative rate 70%
By analyzing the numerical simulation of bridge floor wind field and the result of wind tunnel test, the wind speed reduction coefficient obtaining this operating mode is
0.5807, each typical case's survival wind speed under the different speed limits at bridge floor height for the vehicle is as shown in table 11 below.
Survival wind speed under table 11 different automobile types and speed limit（Arrives stream wind speed at bridge floor）
For this bridge section, analyzed according to above, can obtain various typical vehicle be provided with 3m high by 50%, 60% and 70%
Ventilative rate wind barrier and 4m is high by 50%, 60% and 70% survival wind speed under the operating mode such as ventilative rate wind barrier.Consider bridge peace
Complete and other typical bridge sections of bridge spanning the sea arrange wind barriers situation it is recommended here that, in this bridge section, setting 3m is high 50% ventilative
The wind barrier of rate, so relatively inexpensive and there is preferable vehicle pass-through effect.Therefore, analyze car under other different wind direction angles
Safety traffic wind speed only consider arrange the high 50% ventilative rate wind barrier of 3m operating mode, checking arrange this specification wind barrier when be
No meet vehicle safety pass through.If after analyzing all wind angles to flow wind, vehicle safe driving can be met it is determined that
Typical bridge section II arranges the high 50% ventilative rate wind barrier of 3m.Other typical bridge section analysis processes are identical.
To flow wind direction for different, the wind speed reduction coefficient of the wind barrier of setting same size is different, with typical bridge section
As a example II, the wind speed reduction coefficient of the setting high 50% ventilative rate wind barrier of 3m is as shown in Figure 7 with to flow the relation of wind angle.From figure
In as can be seen that wind speed reduction coefficient and have very big relation flowing wind direction.Therefore, it is possible to cause, when 90 degree, to arrange wind
The wind speed reduction coefficient of barrier is so that the safety traffic wind speed of vehicle reaches engine request, but to flow wind angle at other
Shi Buneng meets the requirement of vehicle safe driving.
Bridge floor setting wind barrier will consider to flow the impact of wind angle, and can not adopt to flow wind perpendicular to bridge floor when set
Put the checking coefficient of wind barrier, so design wind barrier is relatively dangerous.To flow different under wind, to consider wind speed folding simultaneously
Subtract coefficient and this two factors of vehicle safe driving wind speed.In order to compare flowing the result that wind direction is 90 degree, adopt
Wind direction proposed by the present invention affects the concept of coefficient.
When arranging identical wind barrier, the definition that wind direction affects coefficient is：Other is flowing the safety traffic of wind direction vehicle
Bridge floor at arrives stream wind speed go out the ratio of arrives stream wind speed with the bridge floor of safety traffic when 90 degree
In formula, S90For since stream 90 degree of wind direction make reference wind direction affect coefficient, VdIt is arbitrarily to flow wind direction to be provided with wind
Arrives stream wind speed at the bridge floor of barrier rear vehicle safety traffic, V90To flow wind direction to be 90 degree have the vehicle safety row of identical wind barrier
Arrives stream wind speed at the bridge floor sailed.Here consider the least favorable situation that vehicle is unloaded and wet road surface.
Wind direction impact coefficient under difference to flow wind direction under table 12 different automobile types and speed limit
Table 12 illustrates, when wind direction impact coefficient is more than 1.0, represents according to come to flow wind direction be the wind barrier arranging when 90 degree
Can be met other require the safety traffic to flow wind direction vehicle；But when wind direction impact coefficient is less than 1.0, since expression, flow wind
Analyze the safety traffic needs that the wind barrier designing can not meet other and to flow wind direction vehicle to for 90 degree.Therefore, in setting wind
It is considered to flowing the impact of wind direction during barrier, that is, consider to flow the vehicle safe driving wind speed under wind direction and wind speed reduction system
The joint effect of number is relatively safe to the design of air partition.
5th step：If can interpolate that according to the 4th step the bridge floor wind speed field model of wind barrier is safe, now
The height of wind barrier of simulation and ventilative rate are the height of wind barrier of required design and ventilative rate；Otherwise repeat the first step extremely
4th step.
6th step：The height of the wind barrier being obtained according to simulation and ventilative rate design qualified wind barrier.
Rely on the typical Three-dimensional simulation of bridge section and the PRELIMINARY RESULTS of wind tunnel test, according to bridge spanning the sea freeway bridge
The traffic safety in face requires, and can primarily determine that the wind barrier height of bridge spanning the sea highway bridge and ventilative rate.Specific wind screen
Barrier version is mainly made up of air partition bar and air partition column two part.Air partition bar and air partition column all using Q235B steel, its skill
Art standard should meet GB/T1591-2008《Low-alloy high-tensile structural steel》Requirement.
Claims (4)
1. a kind of bridge spanning the sea wind barrier design method is it is characterised in that comprise the following steps：
(1), pass through wind tunnel test and Numerical Wind Tunnel set up respectively, calm barrier when the different wind directions of different bridge type bridge floors wind
Fast field model, the wind speed field of analysis different bridge type bridge floor difference wind direction, the two be combined with each other, verifies, compares, constantly changes simultaneously
The height of wind barrier and ventilative rate that bridge floor wind speed field model middle mold is intended；
(2) bridge floor equivalent wind speed when, calculating that vehicle passes through bridge floor wind speed field model under different bridge types and different wind direction and wind
Fast reduction coefficient, and compared with the traffic safety wind speed of typical vehicle；
(3) bridge floor equivalent wind speed when, vehicle passes through bridge floor wind speed field model under calculating different bridge types and different wind direction and wind
While fast reduction coefficient, record bridge floor wind speed field model middle mold intends the height of wind barrier and ventilative rate；
(4) vehicle, passing through to calculate passes through bridge floor equivalent wind speed and wind speed reduction coefficient and the typical car of bridge floor wind speed field model
The traffic safety wind speed of type compares, and judges to simulate the bridge floor wind speed field model whether safety having wind barrier；
(5) if it is safe for judging in step (4) that simulation has the bridge floor wind speed field model of wind barrier, the wind screen now simulated
The height of barrier and ventilative rate are the height of wind barrier of required design and ventilative rate；Otherwise repeat step (1)-(4)；
(6), the height of the wind barrier being obtained according to simulation and ventilative rate, relatively different bridge types are provided with the result of wind barrier, give
Go out to have the bridge type suggestion of optimal checking effect, and design qualified wind barrier.
2. bridge spanning the sea wind barrier design method according to claim 1 it is characterised in that：Pass through in described step (1)
Wind tunnel test and Numerical Wind Tunnel combine foundation bridge floor wind speed field model in parameter include different automobile types, different road surface, no
Same load-carrying, different bridge types and their combination in any.
3. bridge spanning the sea wind barrier design method according to claim 1 it is characterised in that：Described step（2）In etc.
Imitating wind speed computing formula is：Or,
Wherein：V (z) and V (zi) it is respectively bridge floor height z and ziThe lateral arrives stream wind speed at place；ZeAltitude range for automobile；N is
Along automobile height measuring point quantity.
4. bridge spanning the sea wind barrier design method according to claim 1 it is characterised in that：Wind speed in described step (2)
Reduction coefficient is the ratio with actual lateral arrives stream wind speed for the equivalent wind speed of bridge floor.
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| CN105512413B (en) * | 2015-12-15 | 2018-06-26 | 北京市建筑设计研究院有限公司 | A kind of modeling method suitable for Mountainous Building numerical simulation |
| CN110276111A (en) * | 2019-06-04 | 2019-09-24 | 中国公路工程咨询集团有限公司 | The roadability analysis method and device of bridge floor |
| CN111341101A (en) * | 2020-02-28 | 2020-06-26 | 西南交通大学 | Large-wind driving monitoring and early warning system for large-span highway bridge |
| CN111831012B (en) * | 2020-07-03 | 2023-09-05 | 长沙理工大学 | Intelligent adjustable wind barrier system on bridge and control method thereof |
| CN111931277B (en) * | 2020-07-27 | 2023-11-03 | 中铁大桥勘测设计院集团有限公司 | Design method for safety wind prevention of long-span railway bridge driving and wind reduction device |
| CN113026586A (en) * | 2021-03-16 | 2021-06-25 | 厦门中平公路勘察设计院有限公司 | Design method of bridge wind barrier |
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