CN112580129B - Limit condition analysis method for main component of water-proof curtain wall - Google Patents
Limit condition analysis method for main component of water-proof curtain wall Download PDFInfo
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Abstract
The invention discloses a method for analyzing the limit working condition of a main component of a water-proof curtain wall, which comprises the following steps: s1, acquiring annual load change data and annual pressure vertical distribution change data of the waterproof curtain wall; s2, screening working conditions; s3, calculating the load data and the body type data of main components of the water-proof curtain wall under the screening working condition by using the cable net model with the pressure vertical distribution change data of the screening working condition as a boundary condition; s4, screening out the working condition that the main components have the maximum load according to the load data and the body type data of the main components of the water-proof curtain wall under the screening working condition, and obtaining the limit working condition of the main components of the water-proof curtain wall and the load data and the body type data of the limit working condition of the main components of the water-proof curtain wall. Due to the adoption of the technical scheme, compared with the prior art, the method can find the most dangerous limit working condition possibly occurring on the waterproof curtain wall, can analyze the maximum load possibly occurring on the main components, and lays a solid foundation for improving the design level of the waterproof curtain wall.
Description
Technical Field
The invention relates to the field of data processing, in particular to a limit condition analysis method for main components of a water-proof curtain wall.
Background
The high dam reservoir is easy to form the phenomenon of reservoir water temperature stratification in spring and summer, the water body with higher water temperature is positioned at the upper layer, and the water body with lower temperature is positioned at the lower layer. The water intake of the power station has multiple elevations and is low, and the water temperature is low-temperature water, so that the problem of discharging the low-temperature water in spring and summer is caused. The discharge of low-temperature water in spring and summer of the power station will affect the fish reproduction and crop growth of downstream riverways, and cause serious ecological impact.
The water-resisting curtain wall is one of engineering measures for raising the temperature of water discharged from power station, and its principle is that an underwater water-resisting curtain wall is built at the upstream of water intake to block the low-temperature water at bottom layer, so that the water body with higher upper layer temperature can be passed through the top end of curtain wall and fed into water inlet of power station so as to attain the goal of raising the temperature of water discharged from power station.
The water-proof curtain wall belongs to a novel measure for improving the temperature of the discharged water, and the design and research results which can be used for reference are less. The body type and the load of the water-proof curtain wall are related to the water temperature structure of the reservoir and the operation dispatching state of the water-proof curtain wall. And the operation scheduling scheme and the body type of the water-isolating curtain wall can adversely affect the water temperature structure of the reservoir. In addition, the water-proof curtain wall belongs to a flexible large-deformation and large-span structure, and the stress concentration phenomenon is easy to occur, so the maximum load of each component of the water-proof curtain wall can not occur under the same operation working condition.
Due to the influence of the reasons, the analysis of the limit working condition of the waterproof curtain wall and the analysis of the maximum load of each component become extremely difficult. At present, no effective method is available in the whole engineering design field for reasonably analyzing the data necessary for the engineering design, so that the design level of the industry on the waterproof curtain wall is severely restricted, and the research depth of the waterproof curtain wall is limited. Therefore, it is urgently needed to develop a method for analyzing the limit condition of the main component of the waterproof curtain wall.
Disclosure of Invention
In order to solve the problem that the analysis of the limit working conditions of the main components of the water-separating curtain wall in the background technology is extremely difficult, the invention provides a method for analyzing the limit working conditions of the main components of the water-separating curtain wall, aiming at finding the most dangerous limit working conditions which possibly occur on the water-separating curtain wall and analyzing the same, and the specific technical scheme is as follows.
A method for analyzing the limit working condition of a main component of a water-resisting curtain wall comprises the following steps:
s1, acquiring annual load change data and annual pressure vertical distribution change data of the waterproof curtain wall;
s2, dividing the annual load change data into a plurality of water level intervals, screening out a maximum load working condition corresponding to the maximum curtain wall top overflowing height in each water level interval, a maximum load working condition corresponding to the minimum curtain wall top overflowing height and a maximum load working condition, and defining the screened working conditions as screening working conditions;
s3, calculating load data and body type data of main components of the water-proof curtain wall under the screening working condition by using the cable network model with the pressure vertical distribution change data of the screening working condition as boundary conditions; the main components comprise a cable tower, a buoyancy tank, a ground anchor and a longitudinal cable of the water-proof curtain wall;
s4, screening the working condition that the main components have the maximum load according to the load data and the body type data of the main components of the water-proof curtain wall under the screening working condition, and obtaining the limit working condition of the main components of the water-proof curtain wall and the load data and the body type data of the main components of the water-proof curtain wall under the limit working condition.
The cable net model is an existing model, and the reference documents are as follows:
①Ting E C,Shih C,Wang Y K.Fundamentals of a Vector Form Intrinsic Finite Element:Part I.Basic Procedure and A Plane Frame Element[J].JOURNAL OF MECHANICS,2004.
②Ting E C,Shih C,Wang Y K.Fundamentals of a Vector Form Intrinsic Finite Element:Part II.Plane Solid Elements[J].Journal of Mechanics,2004.
③Shih C,Wang Y K,Ting E C.Fundamentals of a Vector Form Intrinsic Finite Element:Part III.Convected Material Frame and Examples[J].journal of mechanics,2004.
④Wu,Tong-Yue,Wang,Chung-Yue,Chuang,Ching-Chiang,et al. Motion analysis of 3D membrane structures by a vector form intrinsic finite element[J].Journal of the Chinese Institute of Engineers, 2007,30(6):961-976.
when the annual load change data are divided into a plurality of water level intervals, the annual load change data are divided as evenly as possible according to the number of the water level intervals; for example, when the water level interval of 420-450m is divided into three water level intervals, the three water level intervals are divided into 420-430m, 430-440m and 440-450 m; each water level interval ranges from 3 to 40 m.
By the method, the most dangerous limit working condition possibly occurring on the waterproof curtain wall can be found, so that a designer can carry out more precise three-dimensional water temperature model-cable net model iteration coupling simulation analysis on the limit working condition in a targeted manner, and further the design load of each main component is calculated.
Preferably, the step S4 is followed by the steps of:
s5, calculating the pressure distribution data of the main members of the waterproof curtain wall under the limit working conditions by using the three-dimensional water temperature model in front of the dam containing the waterproof curtain wall and taking the body type data of the main members of the waterproof curtain wall under the limit working conditions as input;
and S6, taking the pressure distribution data of the water-proof curtain wall of the main component extreme working condition of the water-proof curtain wall as boundary conditions, and calculating by using a cable network model to obtain the load analysis data and the volume type analysis data of the main component extreme working condition of the water-proof curtain wall.
The three-dimensional water temperature model before the dam that contains water proof curtain is current model, refers to: research on scheme of low-temperature water treatment water-proof curtain of three-plate stream hydropower station [ D ]. Duhui super.
By the method, the load analysis of the limit working condition of the main components of the waterproof curtain wall can be realized, and further design loads are provided for the structural design and material selection of each main component.
Preferably, the step S6 is followed by the steps of:
s7, comparing the load analysis data of the main member limit working condition of the waterproof curtain wall with the load data of the main member limit working condition of the waterproof curtain wall:
if the difference value is larger than the preset allowable value, returning to the step S5, and replacing the body type data of the limit working condition of the main member of the waterproof curtain wall in the step S5 with body type analysis data of the limit working condition of the main member of the waterproof curtain wall;
and if the difference value is smaller than a preset allowable value, outputting the load analysis data of the limit working condition of the main component of the waterproof curtain wall.
Through the iterative computation, the output load analysis data of the main component limit working condition of the waterproof curtain wall can be more accurate.
Specifically, the annual load variation data and the annual pressure vertical distribution variation data of the waterproof curtain wall are obtained according to the following formula:
annual pressure vertical distribution change data of the waterproof curtain wall: f. ofij＝Aj×dpij；
Annual load change data of the water-proof curtain wall: fi＝∑jfij；
Wherein A isjIs the mesh area of the jth mesh; dpijPressure difference of jth grid on ith day; 1, 2, 3 …; j is 1, 2, 3 ….
Preferably, the preset allowable value ranges from 5% to 15%.
Due to the adoption of the technical scheme, compared with the prior art, the method can find the most dangerous limit working condition possibly occurring on the waterproof curtain wall, can analyze the maximum load possibly occurring on the main components, and lays a solid foundation for improving the design level of the waterproof curtain wall.
Drawings
FIG. 1 is a schematic flow diagram of the present invention;
FIG. 2 is a schematic diagram of a reservoir water level change process of a three-plate stream water-proof curtain wall from 2012 to 2019;
fig. 3 is a schematic view of annual load change data of a water-proof curtain wall of each typical scheduling scheme;
fig. 4(a) and (b) are schematic diagrams of load data of main components of the water-proof curtain wall under screening conditions.
Detailed Description
The present invention is described in further detail below with reference to the attached drawing figures.
The embodiment relies on the low-temperature water treatment project of a Guizhou clear water river three-plate stream water power station. The three-plate stream power station is the second stage of a Yuan water main flow 15-step power station and has the regulation performance for many years, wherein the normal water storage level of a reservoir is 475.00m, the maximum dam height is 185.5m, and the water inlet bottom plate height of a water diversion power generation system is 408.00 m. After the water is stored in the reservoir, the reservoir area presents an obvious temperature stratification phenomenon, and the water temperature at the bottom of the reservoir is only 9.6 ℃, so that the water temperature discharged in spring and summer is lower than that in the natural condition, and the adverse effect is generated on the spawning propagation of downstream fishes. In order to enable the fishes to have proper water temperature conditions in the spawning period, a blocking device is required to be built at the upstream of a water inlet of the power station to improve the water temperature discharged from the three-plate creek power station. In order to optimally design the water-proof curtain wall, the limit working condition analysis method of the main components of the water-proof curtain wall is adopted to analyze the limit working condition of the main components of the water-proof curtain wall.
The three-plate stream waterproof curtain wall selects a typical reservoir water temperature operation scheduling scheme based on the historical reservoir operation data. Fig. 2 shows the reservoir water level change process of the three-plate stream water-proof curtain wall from 2012 to 2019.
Because the annual water level amplitude in 2013 is minimum, the water level in the heating period is higher; the annual water level change process in 2014 is approximate to the average water level change process from 2013 to 2019, and the water level in the heating period is centered; the water level variation in 2015 is large, the water level in the temperature rise period is low, and flood discharge occurs in the year, so 2013 is selected as a high-water-level working condition, 2014 is selected as a flat-water-level working condition, and 2015 is selected as a low-water-level working condition for expansion analysis. In addition, according to the three-plate stream power station dispatching operation plan, the water level reaches the normal water storage level 475m in months 7 and 8. However, according to the reservoir water level data after the tripxi power station is built, 475m is never reached in 7 and 8 months every year. In view of the fact that the curtain wall is opened when the water level is high, the water retaining area is the largest, and the flood discharge possibility is the largest in 7 and 8 months, on the basis of 2014 reservoir dispatching data, the flood entering the reservoir in 2015 for 6 months is superposed to enable the water level to reach 475m, and the working condition is used as the flood discharge working condition for simulation analysis.
In summary, typical scheduling schemes include a low water level scheme (2013), a horizontal level scheme (2014), a high water level scheme (2015) and a normal water storage level scheme, annual load change data of the waterproof curtain wall covers various possible operating conditions of the analyzed reservoir as much as possible, and therefore the four schemes are selected as typical scheduling schemes for analysis.
As shown in fig. 1, a method for analyzing the limit condition of a main component of a water-resisting curtain wall includes the following steps:
s1, acquiring annual load change data and annual pressure vertical distribution change data of the waterproof curtain wall;
specifically, annual load variation data of the water-proof curtain wall of each typical scheduling scheme is shown in fig. 3, and annual pressure vertical distribution variation data is not shown.
S2, dividing the annual load change data into a plurality of water level intervals, screening out a maximum load working condition corresponding to the maximum curtain wall top overflowing height in each water level interval, a maximum load working condition corresponding to the minimum curtain wall top overflowing height and a maximum load working condition, and defining the screened working conditions as screening working conditions;
specifically, the water level is divided into six water level intervals of 425-435 m, 435-445 m, 445-455 m, 455-460 m, 460-470 m, 470-475 m and all year round load change data of the water-resisting curtain wall of each typical scheduling scheme. And screening working conditions according to the following rules for each water level interval:
the method comprises the following steps of firstly, setting the maximum curtain wall top overflowing height (the distance from the top end of a water retaining structure of the water-retaining curtain wall to the water surface) and the corresponding maximum load working condition;
the minimum top overflowing height of the curtain wall corresponds to the maximum load working condition;
and thirdly, the maximum load working condition.
The screening results are detailed in table 1.
TABLE 1 screening Condition
S3, calculating load data and body type data of main components of the water-proof curtain wall under the screening working condition by using the cable network model with the pressure vertical distribution change data of the screening working condition as boundary conditions; the main components comprise a cable tower, a buoyancy tank, a ground anchor and a longitudinal cable of the water-proof curtain wall;
specifically, the load data of the main components of the water-resisting curtain wall under the screening working conditions are calculated and shown in table 2 and fig. 4(a) and 4 (b):
| working conditions | Left bank end load (t) | Right shore end load (t) |
| 431-15 | 147.6 | 151.9 |
| 437-15 | 4.3 | 4.3 |
| 438-36 | 1.6 | 2.0 |
| 447-15 | 316.5 | 333.8 |
| 447-50 | 33.9 | 37.4 |
| 455-29.7 | 222.2 | 234.5 |
| 456-21.7 | 260.4 | 276.2 |
| 458-15 | 280.0 | 299.8 |
| 458-50 | 66.4 | 69.5 |
| 463-17 | 297.0 | 295.0 |
| 465-28.3 | 375.1 | 373.5 |
| 467-50 | 169.3 | 169.9 |
| 473-50 | 157.2 | 161.7 |
| 474-30.3 | 192.6 | 200.4 |
| 475-50 | 147.6 | 151.9 |
Table 2: screening working condition main component load data of water-proof curtain wall
S4, screening the working condition that the maximum load occurs in each main component according to the load data and the body type data of the main components of the water-proof curtain wall under the screening working condition, and obtaining the load data and the body type data of the main components of the water-proof curtain wall under the limit working condition.
Specifically, based on the load data and the body type data of main components of the water-proof curtain wall under the screening working condition, the maximum stress of the main cable is 375t, and the main cable appears under the working condition of 465-28.3; the maximum buoyancy required by the buoyancy tank is 25.4t, and the maximum buoyancy is also in the working condition 465-28.3; the maximum stress of the ground anchor and the maximum stress of the longitudinal cable are 40.1t, and the maximum stress appears in the working condition 467-50. Therefore, 465-28.3 and 467-50 working conditions are screened out as limit working conditions. The cable tower has two cable towers, which are respectively arranged at the left shore end and the right shore end, and the cable tower load and the main cable can be considered to be the same because the cable net model is used for calculating the main cable and the load of the main cable directly acts on the cable tower.
The load data of the main components of the waterproof curtain wall under the limit working conditions are shown in the table 3:
table 3: load data of main component limit working condition of water-proof curtain wall
S5, calculating the pressure distribution data of the main members of the waterproof curtain wall under the limit working conditions by using the three-dimensional water temperature model in front of the dam containing the waterproof curtain wall and taking the body type data of the main members of the waterproof curtain wall under the limit working conditions as input;
and S6, taking the pressure distribution data of the water-proof curtain wall of the main component extreme working condition of the water-proof curtain wall as boundary conditions, and calculating by using a cable network model to obtain the load analysis data and the volume type analysis data of the main component extreme working condition of the water-proof curtain wall.
The calculation results of the load analysis data of the main components of the waterproof curtain wall under the limit working conditions are shown in the table 4:
table 4: load analysis data calculation result of main component limit working condition of water-proof curtain wall
S7, comparing the load analysis data of the main member limit working condition of the waterproof curtain wall with the load data of the main member limit working condition of the waterproof curtain wall:
if the difference value is larger than the preset allowable value, returning to the step S5, and replacing the body type data of the limit working condition of the main member of the waterproof curtain wall in the step S5 with body type analysis data of the limit working condition of the main member of the waterproof curtain wall;
and if the difference value is smaller than a preset allowable value, outputting the load analysis data of the limit working condition of the main component of the waterproof curtain wall.
Specifically, the allowable value is set to 10%. Comparing the load analysis data of the main component limit working condition of the water-proof curtain wall with the load data of the main component limit working condition of the water-proof curtain wall: and (3) increasing the load of the cable tower by about 30%, increasing the maximum load of the buoyancy tanks, the longitudinal cables and the ground anchors by about 20%, wherein the maximum load is greater than the allowable 10%, so that the step 5 is returned, the body type data of the limit working condition of the main component of the waterproof curtain wall in the S5 is replaced by the body type analysis data of the limit working condition of the main component of the waterproof curtain wall, the calculation is carried out again, and the calculation result is shown in a table 5. Compared with the first calculation result (table 4), the difference of the load analysis values of the main components is less than 10% of the allowable value, and then the load analysis data of the main components of the waterproof curtain wall under the limit working condition is output to obtain the final calculation result.
Table 5: final calculation result of load analysis data of main member ultimate condition of waterproof curtain wall
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding technical solutions.
Claims (4)
1. A method for analyzing the limit working condition of a main component of a water-resisting curtain wall comprises the following steps:
s1, acquiring annual load change data and annual pressure vertical distribution change data of the waterproof curtain wall; the annual load change data and the annual pressure vertical distribution change data of the waterproof curtain wall are obtained according to the following formulas:
annual pressure vertical distribution change data of the water-proof curtain wall: f. ofij＝Aj×dpij；
Annual load change data of the water-proof curtain wall: f1＝∑jfij；
Wherein A isjIs the mesh area of the jth mesh; dpijPressure difference of jth grid on ith day; 1, 2, 3 …; j ═ 1, 2, 3 …;
s2, dividing the annual load change data into a plurality of water level intervals, screening out a maximum load working condition corresponding to the maximum curtain wall top overflowing height in each water level interval, a maximum load working condition corresponding to the minimum curtain wall top overflowing height and a maximum load working condition, and defining the screened working conditions as screening working conditions;
s3, calculating main component load data and body type data of the water-proof curtain wall under the screening working condition by using the cable net model with the pressure vertical distribution change data of the screening working condition as boundary conditions; the main components comprise a cable tower, a buoyancy tank, a ground anchor and a longitudinal cable of the waterproof curtain wall;
s4, screening out the working condition that the main components have the maximum load according to the load data and the body type data of the main components of the water-proof curtain wall under the screening working condition, and obtaining the limit working condition of the main components of the water-proof curtain wall and the load data and the body type data of the limit working condition of the main components of the water-proof curtain wall.
2. The method for analyzing the limit condition of the main component of the water-resisting curtain wall according to claim 1, wherein the step S4 is followed by the following steps:
s5, calculating the pressure distribution data of the main members of the waterproof curtain wall under the limit working conditions by using the three-dimensional water temperature model in front of the dam containing the waterproof curtain wall by taking the body type data of the main members of the waterproof curtain wall under the limit working conditions as input;
and S6, taking the pressure distribution data of the main member of the waterproof curtain wall under the limit working condition as a boundary condition, and calculating by using a cable network model to obtain the load analysis data and the body type analysis data of the main member of the waterproof curtain wall under the limit working condition.
3. The method for analyzing the limit condition of the main component of the water-resisting curtain wall according to claim 2, wherein the step S6 is followed by the following steps:
s7, comparing the load analysis data of the main member limit working condition of the waterproof curtain wall with the load data of the main member limit working condition of the waterproof curtain wall:
if the difference value is larger than the preset allowable value, returning to the step S5, and replacing the body type data of the main member limit working condition of the waterproof curtain wall in the step S5 with body type analysis data of the main member limit working condition of the waterproof curtain wall;
and if the difference value is smaller than a preset allowable value, outputting the load analysis data of the main component limit working condition of the waterproof curtain wall.
4. The method for analyzing the limit condition of the main component of the water-resisting curtain wall according to claim 3, wherein the preset allowable value ranges from 5% to 15%.
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