CN110895620A - Calculation method and system for wind load body type coefficient of angle steel power transmission tower - Google Patents
Calculation method and system for wind load body type coefficient of angle steel power transmission tower Download PDFInfo
- Publication number
- CN110895620A CN110895620A CN201810959268.6A CN201810959268A CN110895620A CN 110895620 A CN110895620 A CN 110895620A CN 201810959268 A CN201810959268 A CN 201810959268A CN 110895620 A CN110895620 A CN 110895620A
- Authority
- CN
- China
- Prior art keywords
- angle steel
- wind load
- wind
- coefficient
- power transmission
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 278
- 239000010959 steel Substances 0.000 title claims abstract description 278
- 230000005540 biological transmission Effects 0.000 title claims abstract description 139
- 238000004364 calculation method Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 36
- 238000012360 testing method Methods 0.000 claims abstract description 36
- 238000004088 simulation Methods 0.000 claims description 13
- 238000012937 correction Methods 0.000 claims description 6
- 229910000746 Structural steel Inorganic materials 0.000 claims description 3
- 230000037237 body shape Effects 0.000 claims description 3
- 238000002598 diffusion tensor imaging Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 10
- 238000013461 design Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 238000004590 computer program Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 5
- 238000005452 bending Methods 0.000 description 4
- 238000005098 hot rolling Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000001788 irregular Effects 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Images
Landscapes
- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
The invention provides a method and a system for calculating wind load body type coefficients of an angle steel power transmission tower, wherein a leeward side wind load reduction coefficient of an angle steel tower is determined based on a pre-constructed angle steel power transmission tower segment full-scale wind tunnel test model; obtaining the wind load size coefficient of the single-sheet truss on the windward side of the angle steel power transmission tower segment based on a pre-established size coefficient library of the angle steel component under each wind direction angle, and correcting the wind load size coefficient of the single-sheet truss on the windward side of the angle steel power transmission tower segment by adopting a normal wind included angle adjustment coefficient; and calculating the wind load shape coefficient of the angle steel tower according to the corrected wind load shape coefficient of the single-sheet truss on the windward side of the angle steel power transmission tower segment and the wind load reduction coefficient of the leeward side of the angle steel tower. The scheme has wide application prospect and high calculation precision, and provides reference and basis for accurately calculating the wind load of the angle steel power transmission tower.
Description
Technical Field
The invention belongs to the field of a calculation method of a design load of a power transmission line, and particularly relates to a calculation method and a calculation system of a wind load body type coefficient of an angle steel power transmission tower.
Background
The application of the angle steel tower of the power transmission line in power transmission engineering is wide, wind load is control load in the design of the angle steel power transmission tower, and the calculation of the wind load body type coefficient of the section of the angle steel power transmission tower is a key problem in the wind resistance design of the angle steel power transmission tower.
The wind load effect of the angle steel power transmission tower belongs to the typical blunt body streaming category, and is often accompanied with the phenomena of air flow separation, reattachment, vortex shedding and the like, and the Reynolds number effect is complex. As one of the key parameters for angle steel power transmission tower wind load calculation, the wind load shape factor is generally related to the shape of the component, the height-to-width ratio of the tower, the surrounding shadowing effect, and the fill rate of the angle steel power transmission tower segment.
The wind load form factor of the current segment is generally considered according to the whole segment or the windward side of the segment, the current design standard (specified in DL/T5154-2012 overhead transmission line tower structure design technology) specifies that the wind load form factor of the angle steel transmission tower segment is 1.3(1+ η), wherein η is a tower leeward side reduction factor, η can be obtained by looking up a table according to filling coefficients As/A and b/a, wherein As is the projection area of a windward side member, A is the outline area of the tower, a is the windward side width of the tower, and b is the distance between the windward side and the leeward side of the tower.
The ASCE74-2009 American transmission line tower structure design technology specifies that the wind power coefficient (wind load shape coefficient) of a square and triangular section truss structure is calculated according to the consideration of the windward side and according to the difference of the windward side filling rate. EN 50341-1: 2001 EU transmission line design specification is to calculate the filling rate first, then calculate the body type coefficient according to the relation graph of filling rate and body type coefficient. The wind load form factor in the JEC127-1979 Japanese transmission line iron tower design specification is mainly obtained through a wind tunnel test, the form factor of the tower is divided into a front inclined material superposed section and a rear inclined material superposed section, the filling rate is substituted into a formula for calculation, and the form factor of the cross arm is considered according to 90% of the form factor of the tower. The calculation of the wind load body type coefficient of the IEC60826:2003 transmission line international standard is the same as the European Union specification.
Through formula comparison analysis of wind load body type coefficient calculation of various countries, the wind load body type coefficient of the standard tower is a function related to the filling rate, the method is an overall concept, the whole section of tower or the part of the tower is taken as the whole for consideration, and the consideration on the aspect of influencing factors limiting the calculation accuracy is single. Therefore, the calculation accuracy is low, and the applicability is poor.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides the method and the system for calculating the wind load size coefficient of the angle steel power transmission tower, which fully consider the influence factors limiting the calculation precision, provide reference and basis for accurately calculating the wind load of the angle steel power transmission tower, have wide application prospect, and solve the problems of low calculation precision and poor applicability caused by too single influence factor considered in the existing standard calculation method.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme:
a method for calculating wind load shape coefficient of an angle steel power transmission tower comprises the following steps:
determining a leeward side wind load reduction coefficient of the angle steel tower based on a pre-constructed angle steel power transmission tower segment full-scale wind tunnel test model;
obtaining a wind load size coefficient of a windward single-sheet truss of a section of the angle steel power transmission tower based on a pre-established size coefficient library of the angle steel component under each wind direction angle, and correcting the wind load size coefficient of the windward single-sheet truss of the section of the angle steel power transmission tower by adopting a normal wind included angle adjustment coefficient;
and calculating the wind load shape coefficient of the angle steel tower according to the corrected wind load shape coefficient of the single-sheet truss on the windward side of the angle steel power transmission tower segment and the wind load reduction coefficient of the leeward side of the angle steel tower.
Preferably, the determining the windload reduction coefficient of the leeward side of the angle steel tower based on the pre-constructed angle steel power transmission tower segment full-scale wind tunnel test model comprises:
determining the wind load size coefficient of the leeward side and the windward side of the angle steel tower frame based on a pre-constructed angle steel power transmission tower segment full-scale wind tunnel test model;
and calculating the leeward wind load reduction coefficient of the angle steel tower according to the leeward and windward wind load size coefficients of the angle steel tower.
Further, obtaining the shape coefficient of the windload of the leeward side and the windward side of the angle steel tower comprises:
connecting the windward side of the angle steel tower frame with a high-frequency force measuring balance;
the leeward side is arranged on the sliding guide rail and is separated from the high-frequency force measuring balance;
respectively measuring the wind load body type coefficients of the windward side and the leeward side of the angle steel tower by adopting a high-frequency force measuring balance; or,
connecting the leeward side of the angle steel tower frame with a high-frequency force measuring balance;
the windward side is arranged on a sliding guide rail to move and is separated from the high-frequency force-measuring balance;
and respectively measuring the wind load shape coefficients of the windward side and the leeward side of the angle steel tower by adopting a high-frequency force measuring balance.
Preferably, the leeward wind load reduction factor of the angle steel tower is determined by:
η＝μb/μf
wherein η is the windward side wind load reduction coefficient of angle steel tower, mub、μfThe shape coefficient of the leeward wind load and the shape coefficient of the windward wind load of the angle steel tower are respectively.
Further, the obtaining of the wind load shape coefficient of the monolithic truss on the windward side of the angle steel power transmission tower segment based on a pre-established shape coefficient library of the angle steel member under each wind direction angle includes:
according to the spatial arrangement condition of the angle steel members of the angle steel power transmission tower segment windward side angle in the wind load size coefficient library, obtaining the wind direction angle of the angle steel members and the wind load size coefficient of the angle steel members on the angle steel power transmission tower segment windward side single truss by adopting a table interpolation method;
calculating the wind load size coefficient of the single angle steel truss on the windward side of the angle steel power transmission tower segment according to the wind load size coefficient of the angle steel member on the single angle steel power transmission tower segment windward side truss;
defining a normal wind included angle adjustment coefficient according to the wind load shape coefficient of the single-sheet truss on the windward side of the angle steel power transmission tower segment; wherein the angle steel member comprises cold-rolled angle steel and hot-rolled angle steel.
Further, the establishment of the body type coefficient library of the angle steel member under each wind direction angle comprises the following steps:
carrying out wind tunnel test on the angle steel member through a pre-constructed angle steel power transmission tower segment full-scale wind tunnel test model; or carrying out CFD numerical simulation on the angle steel component;
and acquiring a wind tunnel test result and a CFD numerical simulation result, and establishing a wind load body type coefficient library of the angle steel component under each wind direction angle.
Further, determining the wind load shape coefficient of the single-sheet truss on the windward side of the angle steel power transmission tower segment according to the following formula:
in the formula,
weighting wind load shape coefficient, C, of single-sheet truss on windward side of angle steel power transmission tower segmentdiThe wind load form factor of an angle steel member on a single-sheet truss on the windward side of a section of an angle steel power transmission tower is AiThe effective projection area of the ith angle steel component in the angle steel tower is shown.
Further, the defining of the normal wind angle adjustment coefficient includes:
defining an included angle between the normal wind direction of the single-piece truss on the windward side and the airflow direction as a normal wind included angle β;
obtaining the wind load shape coefficient of the single-sheet truss on the windward side under different normal wind included angles β according to a wind tunnel test or CFD numerical simulation of a full scale model;
and defining the adjustment coefficient lambda of the normal wind included angle under the normal wind included angle β as the ratio of the wind load shape coefficient of the single-sheet truss on the windward side under the normal wind included angle β to the wind load shape coefficient of the single-sheet truss on the windward side under the normal wind included angle of 0 degree.
Preferably, the wind load shape coefficient of the single-sheet truss on the windward side of the angle steel power transmission tower segment is corrected according to the following formula:
in the formula,
in order to correct the wind load shape coefficient of the single-sheet truss on the windward side of the angle steel power transmission tower segment,
the wind load shape coefficient of the single-sheet truss on the windward side of the angle steel power transmission tower segment is shown, and lambda is the normal wind included angle adjustment coefficient.
Further, the wind load shape factor of the angle steel tower is determined by the following formula:
in the formula, CDTIs the wind load size coefficient of the angle steel tower, η is the leeward wind load reduction coefficient of the angle steel tower,
the wind load shape coefficient of the single truss on the windward side of the angle steel power transmission tower segment is corrected.
A system for calculating wind load shape coefficient of an angle steel power transmission tower comprises:
the first calculation module is used for determining a leeward side wind load reduction coefficient of the angle steel tower frame based on a pre-constructed angle steel power transmission tower segment full-scale wind tunnel test model;
the correction module is used for obtaining the wind load size coefficient of the single-sheet truss on the windward side of the angle steel power transmission tower segment based on a pre-established size coefficient library of the angle steel component under each wind direction angle, and correcting the wind load size coefficient of the single-sheet truss on the windward side of the angle steel power transmission tower segment by adopting a normal wind included angle adjustment coefficient;
and the second calculation module is used for calculating the wind load size coefficient of the angle steel tower according to the corrected wind load size coefficient of the single-sheet truss on the windward side of the angle steel power transmission tower segment and the wind load reduction coefficient of the leeward side of the angle steel tower.
Compared with the closest prior art, the invention has the following beneficial effects:
the invention provides a method and a system for calculating wind load body type coefficients of an angle steel power transmission tower, which are used for determining a leeward side wind load reduction coefficient of an angle steel tower frame based on a pre-constructed angle steel power transmission tower segment full-scale wind tunnel test model; the method comprises the steps of obtaining a wind load size coefficient of a windward single-sheet truss of a section of the angle steel power transmission tower based on a pre-established size coefficient library of the angle steel component under each wind direction angle, and correcting the wind load size coefficient of the windward single-sheet truss of the section of the angle steel power transmission tower by adopting a normal wind included angle adjustment coefficient. The influence factors limiting the calculation accuracy are fully considered: the influence of a complex structure form and irregular member bar arrangement, the influence of the airflow direction and the angle steel arrangement direction, and the influence of the inclination of the single truss on the windward side of the power transmission angle steel tower segment have wide application prospect; the problems of low calculation precision and poor applicability caused by too single influence factor considered in the conventional standard calculation method are solved.
And finally, calculating the wind load size coefficient of the angle steel tower according to the corrected wind load size coefficient of the single-sheet truss on the windward side of the angle steel power transmission tower segment and the wind load reduction coefficient on the leeward side of the angle steel tower, so that reference and basis are provided for more accurately calculating the wind load of the angle steel power transmission tower, and the accuracy of calculating the wind load of the angle steel power transmission tower is effectively improved.
Drawings
Fig. 1 is a flowchart of a method for calculating a wind load shape coefficient of an angle steel power transmission tower according to an embodiment of the present invention;
FIG. 2 is an angle steel model according to an embodiment of the present invention;
in the figure: (a) is cold bending angle steel, and (b) is hot rolling angle steel;
FIG. 3 is a schematic view of a wind direction angle according to an embodiment of the present invention;
in the figure, (a) is a space position explanation diagram of a wind direction angle α, and (b) is an example explanation of a typical wind direction angle;
FIG. 4 is a schematic view of a normal wind angle provided by an embodiment of the present invention;
fig. 5 is a construction diagram of a tower body section of a typical angle steel power transmission tower according to an embodiment of the present invention;
in the figure, ①② is the main material of the tower body, ③④ is the inclined material of the tower body, and ⑤⑥⑦⑧⑨⑩ is the auxiliary material of the tower body.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The invention aims at the three defects of the existing method for calculating the wind load body type coefficient of the standard angle steel power transmission tower: firstly, the filling coefficient is only considered in the current specification, the influence of complex structural form and irregular member arrangement cannot be considered, secondly, the influence of airflow direction and angle steel placing direction cannot be considered, and thirdly, the influence of inclination of a single truss on the windward side of a power transmission angle steel tower segment cannot be considered. And based on the three defects, the urgent need that the accuracy of the wind load of the angle steel power transmission tower calculated according to the current specification needs to be improved is provided, and the calculation method of the wind load body type coefficient of the angle steel power transmission tower is provided.
The method comprises the steps of firstly providing a determination method of wind load reduction coefficient η of the leeward side of the angle steel tower based on a foot rule model wind tunnel test according to a wind tunnel test result, determining a size coefficient library of an angle steel rod piece under different wind direction angles according to the foot rule model wind tunnel test or CFD numerical simulation, providing a windward side face body type coefficient of the angle steel power transmission tower section based on the size coefficient library of the angle steel component under different wind direction angles according to the spatial arrangement characteristics of the angle steel power transmission tower section windward side angle steel component, providing a normal wind included angle adjustment coefficient lambda and a windward side face single truss wind load size coefficient of the angle steel power transmission tower section considering normal wind included angle correction, and finally providing a wind load size coefficient calculation method of the angle steel power transmission tower section based on the angle steel wind size coefficient, so as to provide reference and basis for more accurately calculating the wind load of the angle steel power transmission tower.
Compared with the traditional calculation method for the wind load shape coefficient of the angle steel power transmission tower, the method solves the problems that the existing standard calculation method cannot consider the influence of a complex structural form and irregular member arrangement, cannot consider the influence of the airflow direction and the angle steel arrangement direction, and cannot consider the influence of the inclination of the single truss on the windward side of the power transmission angle steel tower segment, and has better applicability.
As shown in fig. 1, the method for calculating the wind load shape coefficient of the angle steel power transmission tower provided by the invention comprises the following steps:
s1, determining a leeward side wind load reduction coefficient of the angle steel tower frame based on a pre-constructed angle steel power transmission tower segment full-scale wind tunnel test model;
s2, obtaining a wind load size coefficient of a windward single-sheet truss of the angle steel power transmission tower segment based on a pre-established size coefficient library of the angle steel component under each wind direction angle, and correcting the wind load size coefficient of the windward single-sheet truss of the angle steel power transmission tower segment by adopting a normal wind included angle adjustment coefficient;
s3, calculating the wind load shape coefficient of the angle steel tower according to the corrected wind load shape coefficient of the single-sheet truss on the windward side of the angle steel power transmission tower section and the wind load reduction coefficient of the leeward side of the angle steel tower.
In step S1, determining the leeward side wind load reduction coefficient of the angle steel tower based on the pre-constructed angle steel power transmission tower segment full-scale wind tunnel test model includes:
determining the wind load size coefficient of the leeward side and the windward side of the angle steel tower frame based on a pre-constructed angle steel power transmission tower segment full-scale wind tunnel test model;
and calculating the leeward wind load reduction coefficient of the angle steel tower according to the leeward and windward wind load size coefficients of the angle steel tower.
The method comprises the following steps of determining the windward side and windward side wind load size coefficient of an angle steel tower frame based on a pre-constructed angle steel power transmission tower segment full-scale wind tunnel test model:
designing a full-scale wind tunnel test model of the angle steel power transmission tower segment according to the structural construction drawing of the angle steel power transmission tower, and connecting the windward side of the angle steel tower with a high-frequency force-measuring balance; the leeward side is arranged on the sliding guide rail to move and is separated from the high-frequency force-measuring balance; respectively measuring the wind load body type coefficients of the windward side and the leeward side of the angle steel tower by adopting a high-frequency force measuring balance; or,
connecting the leeward side of the angle steel tower frame with a high-frequency force measuring balance;
the windward side is arranged on a sliding guide rail to move and is separated from the high-frequency force-measuring balance;
and respectively measuring the wind load shape coefficients of the windward side and the leeward side of the angle steel tower by adopting a high-frequency force measuring balance.
The leeward wind load reduction factor of the angle steel tower is also determined by:
η＝μb/μf
wherein η is the windward side wind load reduction coefficient of angle steel tower, mub、μfThe shape coefficient of the leeward wind load and the shape coefficient of the windward wind load of the angle steel tower are respectively.
In step S2, the creating of the body shape coefficient library of the angle steel member at different wind direction angles includes:
carrying out wind tunnel test on the angle steel member through a pre-constructed angle steel power transmission tower segment full-scale wind tunnel test model; or carrying out CFD numerical simulation on the angle steel component;
and acquiring a wind tunnel test result and a CFD numerical simulation result, and establishing a wind load body type coefficient library of the angle steel component under each wind direction angle.
For example, two types of angle steel, namely cold-bending angle steel (fig. 2(a)) and hot-rolling angle steel (fig. 2(b)), are selected to establish a body shape coefficient library under different wind direction angles, wherein the length of a limb is recorded as b, the thickness of the limb is recorded as t, and an included angle between the airflow flow direction and the symmetric axis of the angle steel is defined as a wind direction angle α, as shown in fig. 3 (a).
And obtaining a wind load body type coefficient library of the cold-bending angle steel and the hot-rolling angle steel under different wind direction angles according to a wind tunnel test or CFD numerical simulation of a full-scale model, wherein the wind direction angles range from 0 degree to 180 degrees and are 1 wind direction angle every 10 degrees. Besides, the wind load model also comprises 2 typical wind direction angles of 45 degrees and 135 degrees, and a wind load shape coefficient library is shown in table 1:
TABLE 1 wind load body type coefficient
The wind load form factor of the angle steel member can be obtained according to table interpolation.
Step S2, obtaining the wind load shape coefficient and the corresponding normal wind included angle adjustment coefficient of the single-sheet truss on the windward side of the angle steel power transmission tower segment based on the shape coefficient library of the angle steel member under different wind direction angles comprises:
a, according to the spatial arrangement condition of angle steel members of the windward side angle of the angle steel power transmission tower segment in a wind load size coefficient library, obtaining a wind direction angle of the angle steel member and a wind load size coefficient of the angle steel member on a single-sheet truss of the windward side of the angle steel power transmission tower segment by adopting a table interpolation method; generally, the wind direction angle of the angle iron member with the back of the limb facing outwards is 135 degrees, and the wind direction angle of the angle iron member with the tip of the limb facing outwards is 45 degrees.
b, calculating the wind load size coefficient of the single angle steel truss on the windward side of the angle steel power transmission tower segment according to the wind load size coefficient of the angle steel member on the single angle steel truss on the windward side of the angle steel power transmission tower segment;
and c, defining a normal wind included angle adjustment coefficient according to the wind load shape coefficient of the single truss on the windward side of the angle steel power transmission tower segment.
The effective projection area of the ith angle steel member in a certain tower is AiAnd then the weighted wind load shape coefficient of the single-sheet truss on the windward side of the angle steel power transmission tower segment can be obtained by calculation according to the following formula
In the formula,
weighting wind load shape coefficient, C, of single-sheet truss on windward side of angle steel power transmission tower segmentdiThe wind load form factor of an angle steel member on a single-sheet truss on the windward side of a section of an angle steel power transmission tower is AiThe effective projection area of the ith angle steel component in the angle steel tower is shown.
In step c, defining a normal wind angle adjustment coefficient comprises:
the angle between the normal wind direction and the airflow direction of the single-piece truss on the windward side is defined as the normal wind angle β, as shown in fig. 4.
Obtaining the wind load shape coefficient of the single-sheet truss on the windward side under different normal wind included angles β according to a wind tunnel test or CFD numerical simulation of a full scale model;
and defining the adjustment coefficient lambda of the normal wind included angle under the normal wind included angle β as the ratio of the wind load shape coefficient of the single-sheet truss on the windward side under the normal wind included angle β to the wind load shape coefficient of the single-sheet truss on the windward side under the normal wind included angle of 0 degree.
The normal wind included angle of the single truss on the windward side of the power transmission angle steel tower is generally within 0-20 degrees. And combining the wind tunnel test result or the CFD numerical simulation result of the full scale model, wherein the adjustment coefficient lambda of the normal wind included angle of 0-10 degrees is 0.98, and the adjustment coefficient lambda of the normal wind included angle of 10-20 degrees is 0.96.
Step S2, correcting the wind load shape coefficient of the single-sheet truss on the windward side of the angle steel power transmission tower segment according to the following formula:
in the formula,
in order to correct the wind load shape coefficient of the single-sheet truss on the windward side of the angle steel power transmission tower segment,
the wind load shape coefficient of the single-sheet truss on the windward side of the angle steel power transmission tower segment is shown, and lambda is the normal wind included angle adjustment coefficient.
Step S3 determines the wind load shape factor of the angle steel tower by:
in the formula, CDTIs the wind load size coefficient of the angle steel tower, η is the leeward wind load reduction coefficient of the angle steel tower,
the wind load shape coefficient of the single truss on the windward side of the angle steel power transmission tower segment is corrected.
Examples
The specific example is applied to introduce the process of calculating the wind load shape coefficient of the angle steel power transmission tower by adopting the method:
taking a certain 500kV transmission line angle steel power transmission tower as an example, as shown in FIG. 4, the specifications of the main material, the inclined material and the auxiliary material of the section tower body are L180 multiplied by 14, L100 multiplied by 7 and L40 multiplied by 4 respectively, the wind direction angle of the ①②④⑤⑦⑨ angle steel component is 135 degrees, and the wind direction angle of the ③⑥⑧⑩ angle steel component is 45 degrees
Firstly, according to the method of step S1, designing a full-scale wind tunnel test model of the angle steel power transmission tower segment according to the angle steel power transmission tower body segment construction drawing shown in the attached figure 3, respectively and independently connecting the windward side or the leeward side of an angle steel tower frame with a high-frequency force measuring balance, mounting the other side on a sliding guide rail to move, separating the other side from the high-frequency force measuring balance, and respectively measuring the windward side and windward side wind load body type coefficient mubShape coefficient mu of windward side wind loadfAnd calculating a leeward wind load reduction coefficient η of the angle steel tower according to the following formula.
η＝μb/μf＝0.84/1.40＝0.60
According to the method of the steps S2-S3, a wind load shape coefficient library of the cold-bending angle steel and the hot-rolling angle steel under different wind direction angles is obtained according to a wind tunnel test or CFD numerical simulation of a full scale model, and the wind load shape coefficient of each rod piece is obtained from a database
TABLE 2 wind load shape factor of each rod
According to the method of step S3, the projected areas of the respective members are shown in Table 3.
TABLE 3 projected area of each rod
| Rod number | Projected area A of the memberi |
| 1 | 0.5 |
| 2 | 0.5 |
| 3 | 0.48 |
| 4 | 0.48 |
| 5 | 0.04 |
| 6 | 0.048 |
| 7 | 0.048 |
| 8 | 0.048 |
| 9 | 0.048 |
| 10 | 0.04 |
Calculating to obtain the weighted wind load shape coefficient of the single-sheet truss on the windward side of the angle steel power transmission tower segment
According to the method of step S3, the normal wind angle adjustment coefficient λ is determined to be 0.98.
According to the step S4, calculating the wind load shape coefficient of the single-sheet truss on the windward side of the angle steel power transmission tower segment with normal wind included angle correction considered
Calculating the wind load shape coefficient of the steel tube power transmission tower according to the method of the step S5, and respectively obtaining a correction coefficient η of the wind load reduction coefficient of the leeward side of the steel tube power transmission tower and a single-piece truss weighted wind load corrected by considering the normal wind included angle according to the step S2 and the step S4Carrier type coefficient
Calculating wind load body type coefficient C of steel pipe power transmission towerDT＝1.753×(1+0.6)＝2.805。
Based on the same invention concept, the application also provides a system for calculating the wind load body type coefficient of the angle steel power transmission tower, which comprises the following steps:
the first calculation module is used for determining a leeward side wind load reduction coefficient of the angle steel tower frame based on a pre-constructed angle steel power transmission tower segment full-scale wind tunnel test model;
the correction module is used for obtaining the wind load size coefficient of the single-sheet truss on the windward side of the angle steel power transmission tower segment based on a pre-established size coefficient library of the angle steel component under each wind direction angle, and correcting the wind load size coefficient of the single-sheet truss on the windward side of the angle steel power transmission tower segment by adopting a normal wind included angle adjustment coefficient;
and the second calculation module is used for calculating the wind load size coefficient of the angle steel tower according to the corrected wind load size coefficient of the single-sheet truss on the windward side of the angle steel power transmission tower segment and the wind load reduction coefficient of the leeward side of the angle steel tower.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Claims (11)
1. A method for calculating wind load shape coefficient of an angle steel power transmission tower is characterized by comprising the following steps:
determining a leeward side wind load reduction coefficient of the angle steel tower based on a pre-constructed angle steel power transmission tower segment full-scale wind tunnel test model;
obtaining a wind load size coefficient of a windward single-sheet truss of a section of the angle steel power transmission tower based on a pre-established size coefficient library of the angle steel component under each wind direction angle, and correcting the wind load size coefficient of the windward single-sheet truss of the section of the angle steel power transmission tower by adopting a normal wind included angle adjustment coefficient;
and calculating the wind load shape coefficient of the angle steel tower according to the corrected wind load shape coefficient of the single-sheet truss on the windward side of the angle steel power transmission tower segment and the wind load reduction coefficient of the leeward side of the angle steel tower.
2. The method according to claim 1, wherein the determining a leeward wind load reduction coefficient of the angle steel tower based on the pre-constructed angle steel power transmission tower segment full-scale wind tunnel test model comprises:
determining the wind load size coefficient of the leeward side and the windward side of the angle steel tower frame based on a pre-constructed angle steel power transmission tower segment full-scale wind tunnel test model;
and calculating the leeward wind load reduction coefficient of the angle steel tower according to the leeward and windward wind load size coefficients of the angle steel tower.
3. The method of claim 2, wherein obtaining the leeward and windward wind load shape factor of the angle steel tower comprises:
connecting the windward side of the angle steel tower frame with a high-frequency force measuring balance;
the leeward side is arranged on the sliding guide rail and is separated from the high-frequency force measuring balance;
respectively measuring the wind load body type coefficients of the windward side and the leeward side of the angle steel tower by adopting a high-frequency force measuring balance; or,
connecting the leeward side of the angle steel tower frame with a high-frequency force measuring balance;
the windward side is arranged on a sliding guide rail to move and is separated from the high-frequency force-measuring balance;
and respectively measuring the wind load shape coefficients of the windward side and the leeward side of the angle steel tower by adopting a high-frequency force measuring balance.
4. A method according to claim 2, wherein the leeward wind load reduction factor of the angle steel tower is determined by:
η＝μb/μf
wherein η is the windward side wind load reduction coefficient of angle steel tower, mub、μfThe shape coefficient of the leeward wind load and the shape coefficient of the windward wind load of the angle steel tower are respectively.
5. The method of claim 4, wherein obtaining the wind load shape factor of the monolithic truss windward side of the angle steel power transmission tower segment based on a pre-established library of shape factors of the angle steel member at each wind direction angle comprises:
according to the spatial arrangement condition of the angle steel members of the angle steel power transmission tower segment windward side angle in the wind load size coefficient library, obtaining the wind direction angle of the angle steel members and the wind load size coefficient of the angle steel members on the angle steel power transmission tower segment windward side single truss by adopting a table interpolation method;
calculating the wind load size coefficient of the single angle steel truss on the windward side of the angle steel power transmission tower segment according to the wind load size coefficient of the angle steel member on the single angle steel power transmission tower segment windward side truss;
defining a normal wind included angle adjustment coefficient according to the wind load shape coefficient of the single-sheet truss on the windward side of the angle steel power transmission tower segment; wherein the angle steel member comprises cold-rolled angle steel and hot-rolled angle steel.
6. The method of claim 5, wherein the building of the library of body shape factors for the angle iron member at each wind direction angle comprises:
carrying out wind tunnel test on the angle steel member through a pre-constructed angle steel power transmission tower segment full-scale wind tunnel test model; or carrying out CFD numerical simulation on the angle steel component;
and acquiring a wind tunnel test result and a CFD numerical simulation result, and establishing a wind load body type coefficient library of the angle steel component under each wind direction angle.
7. The method according to claim 5, wherein the wind load shape factor of the monolithic truss on the windward side of the angle steel power transmission tower segment is determined by:
in the formula,
for angle steel power transmission tower segment windwardFace-to-face single-sheet truss weighted wind load shape coefficient, CdiThe wind load form factor of an angle steel member on a single-sheet truss on the windward side of a section of an angle steel power transmission tower is AiThe effective projection area of the ith angle steel component in the angle steel tower is shown.
8. The method of claim 5, wherein defining the normal wind angle adjustment factor comprises:
defining an included angle between the normal wind direction of the single-piece truss on the windward side and the airflow direction as a normal wind included angle β;
obtaining the wind load shape coefficient of the single-sheet truss on the windward side under different normal wind included angles β according to a wind tunnel test or CFD numerical simulation of a full scale model;
and defining the adjustment coefficient lambda of the normal wind included angle under the normal wind included angle β as the ratio of the wind load shape coefficient of the single-sheet truss on the windward side under the normal wind included angle β to the wind load shape coefficient of the single-sheet truss on the windward side under the normal wind included angle of 0 degree.
9. The method according to claim 1, wherein the angle steel power transmission tower segment windward single truss wind load shape factor is corrected by:
in the formula,
in order to correct the wind load shape coefficient of the single-sheet truss on the windward side of the angle steel power transmission tower segment,
the wind load shape coefficient of the single-sheet truss on the windward side of the angle steel power transmission tower segment is shown, and lambda is the normal wind included angle adjustment coefficient.
10. The method of claim 9, wherein the wind load shape factor of the angle steel tower is determined by:
in the formula, CDTIs the wind load size coefficient of the angle steel tower, η is the leeward wind load reduction coefficient of the angle steel tower,
the wind load shape coefficient of the single truss on the windward side of the angle steel power transmission tower segment is corrected.
11. The utility model provides an angle steel transmission tower wind load size coefficient calculation system which characterized in that includes:
the first calculation module is used for determining a leeward side wind load reduction coefficient of the angle steel tower frame based on a pre-constructed angle steel power transmission tower segment full-scale wind tunnel test model;
the correction module is used for obtaining the wind load size coefficient of the single-sheet truss on the windward side of the angle steel power transmission tower segment based on a pre-established size coefficient library of the angle steel component under each wind direction angle, and correcting the wind load size coefficient of the single-sheet truss on the windward side of the angle steel power transmission tower segment by adopting a normal wind included angle adjustment coefficient;
and the second calculation module is used for calculating the wind load size coefficient of the angle steel tower according to the corrected wind load size coefficient of the single-sheet truss on the windward side of the angle steel power transmission tower segment and the wind load reduction coefficient of the leeward side of the angle steel tower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810959268.6A CN110895620A (en) | 2018-08-22 | 2018-08-22 | Calculation method and system for wind load body type coefficient of angle steel power transmission tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810959268.6A CN110895620A (en) | 2018-08-22 | 2018-08-22 | Calculation method and system for wind load body type coefficient of angle steel power transmission tower |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110895620A true CN110895620A (en) | 2020-03-20 |
Family
ID=69784775
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810959268.6A Pending CN110895620A (en) | 2018-08-22 | 2018-08-22 | Calculation method and system for wind load body type coefficient of angle steel power transmission tower |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110895620A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111985018A (en) * | 2020-03-31 | 2020-11-24 | 重庆科技学院 | Calculation method for designing wind load of ultrahigh large-span tower and line based on inertia force method and tower line separation method and considering tower line coupling influence |
| CN112287424A (en) * | 2020-03-31 | 2021-01-29 | 重庆科技学院 | Calculation method for designing wind load of ultrahigh large-span tower and line based on effective load method and tower line separation method and considering tower line coupling influence |
| CN112903234A (en) * | 2021-01-11 | 2021-06-04 | 宁波市电力设计院有限公司 | Wind load test device of local pole system of power transmission tower structure |
| CN113155406A (en) * | 2021-02-04 | 2021-07-23 | 宁波市电力设计院有限公司 | Method for determining wind load body type coefficient of rod member of power transmission tower structure |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103324849A (en) * | 2013-06-19 | 2013-09-25 | 国家电网公司 | Method for determining shape coefficient of single rod of power transmission tower based on CFD (computational fluid dynamics) skew wind |
| CN104298840A (en) * | 2013-07-16 | 2015-01-21 | 国家电网公司 | Determination method of tower body wind load of triangular section iron tower |
-
2018
- 2018-08-22 CN CN201810959268.6A patent/CN110895620A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103324849A (en) * | 2013-06-19 | 2013-09-25 | 国家电网公司 | Method for determining shape coefficient of single rod of power transmission tower based on CFD (computational fluid dynamics) skew wind |
| CN104298840A (en) * | 2013-07-16 | 2015-01-21 | 国家电网公司 | Determination method of tower body wind load of triangular section iron tower |
Non-Patent Citations (3)
| Title |
|---|
| FENGLI YANG ET AL: "Wind tunnel tests on wind loads acting on an angled steel triangulartransmission tower", JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS, vol. 156, 30 September 2016 (2016-09-30), pages 93 - 103 * |
| 杨风利: "角钢输电铁塔横担角度风荷载系数取值研究", 工程力学, vol. 34, no. 4, 30 April 2017 (2017-04-30), pages 150 - 159 * |
| 王东: "角钢输电塔风荷载作用模式研究", 中国优秀硕士学位论文全文数据库工程科技Ⅱ辑, no. 08, 15 August 2015 (2015-08-15), pages 038 - 292 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111985018A (en) * | 2020-03-31 | 2020-11-24 | 重庆科技学院 | Calculation method for designing wind load of ultrahigh large-span tower and line based on inertia force method and tower line separation method and considering tower line coupling influence |
| CN112287424A (en) * | 2020-03-31 | 2021-01-29 | 重庆科技学院 | Calculation method for designing wind load of ultrahigh large-span tower and line based on effective load method and tower line separation method and considering tower line coupling influence |
| CN112287424B (en) * | 2020-03-31 | 2022-04-22 | 重庆科技学院 | Calculation method for designing wind load of ultrahigh large-span tower and line based on effective load method and tower line separation method and considering tower line coupling influence |
| CN111985018B (en) * | 2020-03-31 | 2023-07-07 | 重庆科技学院 | Calculation method for ultrahigh large-span tower and line wind load based on inertial force method and tower line separation method and considering tower line coupling influence |
| CN112903234A (en) * | 2021-01-11 | 2021-06-04 | 宁波市电力设计院有限公司 | Wind load test device of local pole system of power transmission tower structure |
| CN112903234B (en) * | 2021-01-11 | 2023-10-20 | 宁波市电力设计院有限公司 | Wind load test device of local pole system of transmission tower structure |
| CN113155406A (en) * | 2021-02-04 | 2021-07-23 | 宁波市电力设计院有限公司 | Method for determining wind load body type coefficient of rod member of power transmission tower structure |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110895620A (en) | Calculation method and system for wind load body type coefficient of angle steel power transmission tower | |
| CN106934179B (en) | Method for processing data of main node tensile test of angle steel of power transmission tower | |
| CN109101726B (en) | Method for determining overall fluctuating wind load spectrum of power transmission tower based on wind load total | |
| CN105568864A (en) | Integrated algorithm for determining reasonable construction cable force of cable-stayed bridge | |
| CN108959742A (en) | Large span transmission tower-line system aeroelastic model design method | |
| CN108647440B (en) | Method and device for confirming wind load body type coefficient of steel pipe power transmission tower | |
| CN106202666B (en) | A kind of calculation method of marine shafting bearing adjustment of displacement | |
| CN110083963A (en) | A kind of Hanger Design method based on BIM electromechanical model | |
| CN105251778A (en) | Feedback control method for edge thinning of single-taper working roll shifting rolling mill | |
| CN104298840A (en) | Determination method of tower body wind load of triangular section iron tower | |
| CN105808863B (en) | The auxiliary spring that end contact lacks piece variable cross-section major-minor spring works load Method for Checking | |
| CN107552573A (en) | Method and device for controlling internal stress of high-strength steel | |
| CN115795770A (en) | Method and system for estimating welding deformation of vehicle body | |
| CN105320816A (en) | Improved airfoil optimization design method | |
| CN110968908B (en) | Design method of tension balance index of tie bar of flying swallow type arch bridge | |
| CN105825008B (en) | The auxiliary spring that non-end contact lacks piece variable cross-section major-minor spring works load Method for Checking | |
| CN111551343A (en) | Wind tunnel test design method for full-speed domain aerodynamic characteristics of vertical recovery rocket sublevel with grid rudder | |
| CN108197415B (en) | Optimized design method for vertical beam type axial force element structure of rod type balance | |
| TWI323197B (en) | Method for increasing the process stability, especially the absolute thickness accuracy and the plant safety-during hot rolling of steel or nonferrous materials | |
| CN108655176B (en) | Self-adaptive calculation method of cold rolling forward slip model for stable rolling | |
| CN113536436A (en) | Improved vibration mode superposition-based lattice tower structure displacement reconstruction method | |
| CN103020442B (en) | A kind of secondary graphics method that pipe stress for engineering problem is evaluated | |
| CN105912794B (en) | Non- end contact lacks the calculation method of piece parabolic type each stress of major-minor spring | |
| CN103626031A (en) | Method for correcting prefabricated camber of crane main beam | |
| CN105889378B (en) | The design method of the few piece reinforcement end auxiliary spring root thickness of ends contact formula |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |