CN110502827B - Concrete dam temperature field simulation method reflecting daily change of outside air temperature - Google Patents
Concrete dam temperature field simulation method reflecting daily change of outside air temperature Download PDFInfo
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- CN110502827B CN110502827B CN201910764339.1A CN201910764339A CN110502827B CN 110502827 B CN110502827 B CN 110502827B CN 201910764339 A CN201910764339 A CN 201910764339A CN 110502827 B CN110502827 B CN 110502827B
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Abstract
A concrete dam temperature field simulation method reflecting the daily change of the outside air temperature relates to a concrete dam temperature field simulation method, in particular to a temperature field simulation method reflecting the daily change of the outside air temperature. The method of the invention adopts an air temperature formula reflecting daily change of the air temperature to fit according to the actually measured air temperature of a measuring point, combines the drawn casting information, the temperature control measure and other boundary conditions, adopts a life and death method, an equivalent negative temperature difference method and a method for changing the coefficient of surface unit materials, and carries out temperature field calculation after applying constraint conditions. Aiming at the calculation problem of the temperature field of the concrete dam, the invention creatively provides the temperature fitting function considering the daily change of the temperature, and can further improve the calculation progress of the temperature field.
Description
Technical Field
The invention relates to a concrete dam temperature field simulation method, in particular to a temperature field simulation method reflecting the daily change of the outside air temperature.
Background
For the construction of mass concrete, the characteristics of large volume, strong constraint, slow heat dissipation, uneven internal temperature distribution and the like exist, and in addition, the external temperature change often generates larger temperature stress, and temperature cracks are very easy to generate in the construction and operation process. Therefore, reasonably evaluating the working state of the concrete dam and accurately simulating and predicting the internal temperature field of the concrete dam, and further providing corresponding temperature control standards and temperature control measures are one of the key technologies for guaranteeing the safety and stability of the concrete dam and are one of the most economical and effective methods.
Common concrete temperature simulation methods include finite element methods, difference methods, graphical methods, and the like. The finite element method is a commonly used method in the current engineering because of the characteristics of being easy to adapt to irregular boundaries, being capable of locally encrypting grids, having mature and feasible matching programs and the like. The accuracy of the finite element method for simulating the temperature field of the concrete dam is usually determined by several factors such as the accuracy of a finite element model, the selection of material parameters, the drawing up of boundary conditions and the like. The air temperature is the most important factor in the boundary condition and plays an important role in accurately simulating the temperature field.
Currently, in finite element calculation, temperature change is usually represented by a cosine function in months or a relatively fine fourier series in months, and the calculation requirement can be met within a certain precision range, but when the influence of temperature change in certain days (such as early age) is intensively researched, the precision is insufficient. Therefore, a method is needed, which can sufficiently describe the daily change of the air temperature, further improve the simulation precision of the temperature field, and meet the calculation requirements under some special working conditions.
Disclosure of Invention
In order to solve the technical problems, the invention provides an air temperature function which can better reflect the daily change characteristics of air temperature, and the air temperature function is applied to the calculation of the temperature field of the concrete dam, so that the simulation precision of the temperature field of the concrete dam can be further improved, and the research on the temperature field reflecting the daily change of the air temperature within a specific date can be realized.
The method is used in ANSYS system, and is a large-scale general finite element analysis software developed by American ANSYS company. In the software, a solid70 unit is a self-contained unit of an ANSYS program and is used for creating a three-dimensional finite element model and calculating a temperature field.
The invention relates to a concrete dam temperature field simulation method reflecting the daily change of the outside air temperature, which is characterized by comprising the following steps of:
s1: according to the characteristics of the concrete dam, a solid70 unit is adopted in ANSYS to create a three-dimensional finite element model;
s2: fitting by adopting a temperature formula reflecting daily change of the temperature according to the actually measured temperature of the measuring point;
the air temperature formula is in a cosine function form, and specifically comprises the following steps:
t (τ) is the ambient temperature at time τ;
τ represents time in hours;
Tamis the average annual temperature;
Aathe annual variation of air temperature;
τ0the time with the highest temperature is in the unit of month;
Adthe air temperature daily amplitude;
τ1the time of the highest gas temperature in one day is in hours;
s3: combining the proposed pouring information, the proposed temperature control measures and other boundary conditions, adopting a method of life and death of a system self-contained unit to simulate a construction process, adopting the existing equivalent negative temperature difference method to simulate a water-passing temperature control measure, and adopting the existing method of changing the material coefficient of a surface unit to simulate surface heat preservation;
s4: and (3) applying constraint conditions to the calculation model, applying full constraint to the foundation part, applying normal constraint to the side surface of the foundation, and calculating the temperature field.
The concrete dam is characterized by comprising a concrete dam body, concrete material partitions and a pouring condition; and in the created three-dimensional finite element model, giving respective material parameters of different regions for finite element calculation according to the partition condition of the dam body material.
The pouring information comprises concrete pouring layer thickness, pouring date and pouring temperature; the temperature control measures comprise water supply measures, such as water pipe arrangement, water supply date, water supply flow and water supply temperature; spraying on the surface of the bin, flowing water on the surface of the bin and preserving heat on the surface of the bin; the other boundary conditions refer to water temperature and ground temperature.
Judging whether the temperature field calculation result is correct or not, and carrying out post-processing on the temperature field calculation result, wherein the method specifically comprises the following steps: the method comprises the steps of adopting General Poostproc in an ANSYS system to output temperature field cloud chart information, combining a TimeHist Postpro output unit temperature course curve with Tecplot and Excel to perform data processing, wherein the data processing refers to drawing the output temperature field cloud chart information into a printable color temperature cloud chart in Tecplot software; the TimeHist Postpro output cell temperature history curve is plotted in excel as a graph that can be edited in the office suite.
Aiming at the calculation problem of the temperature field of the concrete dam, the invention creatively provides the temperature fitting function considering the daily change of the temperature, and can further improve the calculation progress of the temperature field. Meanwhile, after the formula is introduced, the defect that the daily change of the air temperature cannot be considered in the traditional method can be overcome, and the problem of the change of the temperature field caused by the daily change of the air temperature can be further researched.
Drawings
FIG. 1 is a flow chart of an embodiment of the present invention.
Fig. 2 is a finite element model of a 10# dam section of a concrete gravity dam in embodiment 1 of the present invention.
Fig. 3 is a sectional view of a concrete gravity dam 10# dam material according to example 1.
Fig. 4 is a fitting graph of measured air temperature according to an embodiment of the invention.
Fig. 5 is a graph of the temperature history of characteristic points near the upstream and downstream surfaces at characteristic elevation 1539m from 2016 at 12 and 14 days 12 and 2016 at 12 and 20 days 12 and 2016.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, it being understood that the examples described herein are for the purpose of illustration and explanation and are not intended to limit the invention.
Example 1: the invention provides a concrete dam temperature field simulation method reflecting the daily change of the outside air temperature by taking a 10# dam section of a Huangdeng roller compacted concrete gravity dam as an example, which comprises the following steps:
s1: according to the characteristics of the concrete dam, a solid70 unit is adopted in ANSYS to create a three-dimensional finite element model;
the concrete dam is characterized by comprising a concrete dam body, concrete material partitions and pouring conditions;
in the created three-dimensional finite element model, respective material parameters of different regions are given according to the partition condition of dam body materials for finite element calculation, and the created model is as shown in the attached figures 2 and 3.
S2: fitting by adopting a temperature formula reflecting daily change of the temperature according to the actually measured temperature of the measuring point;
the air temperature formula is in a cosine function form, and specifically comprises the following steps:
t (τ) is the ambient temperature at time τ;
τ represents time in hours;
Tamis the average annual temperature;
Aathe annual variation of air temperature;
τ0the time with the highest temperature is in the unit of month;
Adthe air temperature daily amplitude;
τ1the time of the highest gas temperature in one day is in hours;
fitting the actually measured temperature data of the Huangdeng roller compacted concrete gravity dam 10# dam segment from 2016, 12 months and 1 days to 2017, 2 months and 28 days by using a temperature fitting formula;
the temperature fitting formula is as follows:
s3: combining the proposed pouring information, the proposed temperature control measures and other boundary conditions, adopting a method of life and death of a system self-contained unit to simulate a construction process, adopting the existing equivalent negative temperature difference method to simulate a water-passing temperature control measure, and adopting the existing method of changing the material coefficient of a surface unit to simulate surface heat preservation;
the pouring information comprises concrete pouring layer thickness, pouring date and pouring temperature;
the temperature control measures comprise water supply measures, such as water pipe arrangement, water supply date, water supply flow and water supply temperature; spraying on the surface of the bin, flowing water on the surface of the bin and preserving heat on the surface of the bin;
the other boundary conditions refer to water temperature and ground temperature.
S4: applying constraint conditions to the calculation model, and calculating a temperature field;
and applying constraint conditions by adopting software ANSYS, applying full constraint to the foundation part, applying normal constraint to the side surface of the foundation, and calculating a temperature field.
S5: judging whether the calculated settlement result of the temperature field is correct or not, and carrying out post-processing on the result; the method comprises the steps of adopting General Poostproc in an ANSYS system to output temperature field cloud chart information and a TimeHistPostpro output unit temperature course curve, and combining Tecplot and Excel to perform data processing, wherein the data processing refers to drawing the output temperature field cloud chart information into a printable color temperature cloud chart in Tecplot software; drawing a TimeHist Postpro output unit temperature history curve into a graph which can be edited in an office suite in excel; as shown in fig. 4, the characteristic point near the upstream and downstream surfaces at 1539m dam elevation of the present invention has a temperature history curve from 2016 at 14 days 12 months at 2016 to 20 days at 12 months at 2016 at 12 months at 2016.
Claims (4)
1. The concrete dam temperature field simulation method for reflecting the daily change of the outside air temperature is characterized by comprising the following steps of:
s1: according to the characteristics of the concrete dam, a solid70 unit is adopted in ANSYS to create a three-dimensional finite element model;
s2: fitting by adopting a temperature formula reflecting daily change of the temperature according to the actually measured temperature of the measuring point;
the air temperature formula is in a cosine function form, and specifically comprises the following steps:
t (τ) is the ambient temperature at time τ;
τ represents time in hours;
Tamis the average annual temperature;
Aathe annual variation of air temperature;
τ0the time with the highest temperature is in the unit of month;
Adthe air temperature daily amplitude;
τ1the time of the highest gas temperature in one day is in hours;
s3: combining the proposed pouring information, proposing to adopt temperature control measures and other boundary conditions, wherein the other boundary conditions refer to water temperature and ground temperature, adopting a method of living and death of a system self-contained unit to simulate a construction process, adopting the existing equivalent negative temperature difference method to simulate water-passing temperature control measures, and adopting the existing method of changing the material coefficient of a surface unit to simulate surface heat preservation;
s4: and (3) applying constraint conditions to the calculation model, applying full constraint to the foundation part, applying normal constraint to the side surface of the foundation, and calculating the temperature field.
2. The method for simulating a temperature field of a concrete dam reflecting the daily change of the ambient temperature according to claim 1, wherein the characteristics of the concrete dam comprise the concrete dam body type, the concrete material partition and the pouring condition; and in the created three-dimensional finite element model, giving respective material parameters of different regions for finite element calculation according to the partition condition of the dam body material.
3. The method for simulating a temperature field of a concrete dam reflecting daily changes in ambient temperature as claimed in claim 1, wherein said casting information includes a concrete casting thickness, a casting date and a casting temperature; the temperature control measures comprise water pipe arrangement, water passing date, water passing flow, water passing temperature, bin surface spraying, surface flowing water and surface heat preservation.
4. The method for simulating a temperature field of a concrete dam according to the daily variation of the ambient temperature as claimed in claim 1, wherein the temperature field calculation result is subjected to the judgment of correctness or not and the post-processing, and specifically comprises: the method comprises the steps of adopting General Poostproc in an ANSYS system to output temperature field cloud chart information, combining a TimeHist Postpro output unit temperature course curve with Tecplot and Excel to perform data processing, wherein the data processing refers to drawing the output temperature field cloud chart information into a printable color temperature cloud chart in Tecplot software; the TimeHist Postpro output cell temperature history curve is plotted in excel as a graph that can be edited in the office suite.
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| CN107907410A (en) * | 2017-11-14 | 2018-04-13 | 中国水利水电科学研究院 | A kind of method for testing crack-resistant performance of concrete |
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| JP6240721B1 (en) * | 2016-07-20 | 2017-11-29 | 公益社団法人日本コンクリート工学会 | Stress / strain calculation system and stress / strain calculation program |
| CN107907410A (en) * | 2017-11-14 | 2018-04-13 | 中国水利水电科学研究院 | A kind of method for testing crack-resistant performance of concrete |
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