Method for calculating concrete surface heat release coefficient based on field test
A technology of concrete surface and heat release coefficient, applied in the direction of calculation, computer-aided design, material thermal development, etc., can solve the problems of poor temperature control and anti-cracking measures, inaccurate concrete temperature field, etc.
Active Publication Date: 2021-05-04
CHINA INST OF WATER RESOURCES & HYDROPOWER RES +2
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Problems solved by technology
Considering that when inverting multiple parameters with an optimization algorithm, a local optimal solution may be obtained instead of a global optimal solution, which also leads to inaccurate concrete temperature field simulation, and the selected temperature control and anti-cracking measures are not effective!
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[0051] The structure and features of the present invention will be described in detail below in conjunction with the drawings and embodiments. It should be noted that various modifications can be made to the embodiments disclosed herein, therefore, the embodiments disclosed in the specification should not be regarded as limitations on the present invention, but only as examples of embodiments, and its purpose is to make the present invention The features of the invention are self-evident.
[0052] Due to the traditional calculation of the concrete surface heat release coefficient according to the "Code for Design of Concrete Arch Dams" (SL282-2018), the correction coefficient for thermal insulation materials is too wide, and the selection of construction methods and thermal insulation materials is quite different from the current construction site. , resulting in inaccurate calculated concrete surface heat release coefficient, which in turn leads to inaccurate simulated concre...
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The invention provides a method for calculating the surface heat release coefficient of the concrete based on field test. Under the condition that the air thermal resistance is not considered, the surface heat release coefficient of the concrete surface covering a dry thermal insulation material covers the concrete surface of the thermal insulation material with different humidity, and under the condition that the surface heat release coefficient of the concrete surface considers the air thermal resistance, and the thermal insulation material covers. In the surface heat release coefficient, k1 is a thermal insulation material state coefficient, k1 is equal to 2 when the thermal insulation material is in a compaction state, and k1 is equal to 1 when the thermal insulation material is in a pasting state; k2 is a humidity influence coefficient of the thermal insulation material, k2 is equal to 0.016 when the thermal insulation material is in a humid state, and k2 is equal to 0 when the thermal insulation material is in a completely dry state; lambda3 is the heat conductivity coefficient of the thermal insulation material; beta0 is the surface heat release coefficient of the concrete when the thermal insulation material is not covered; and h is the thickness of the thermal insulation material. The defects of low practicability and inaccurate surface heating coefficient calculation caused by wide parameter values and large differences between construction mode and thermal insulation material selection and current construction sites in a traditional calculation method are overcome.
Description
technical field [0001] The present invention relates to a method for calculating the heat release coefficient of concrete surface, in particular, the present invention relates to a method for calculating the heat release of concrete surface based on the field test and directly using the numerical reconstruction temperature field of temperature measuring points without inversion of adiabatic temperature rise coefficient method. The invention belongs to the technical field of water conservancy construction. Background technique [0002] Cracks in mass concrete during construction will have a serious impact on the safety of the overall structure formed by pouring concrete. Temperature cracks are the most common form of cracks in the initial stage of concrete pouring. Therefore, taking appropriate temperature control and anti-cracking measures is one of the effective methods to reduce or avoid concrete cracking. [0003] In order to select the temperature control and anti-crac...
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Login to View More IPC IPC(8): G01N25/20G01N33/38G06F30/13G06F30/23G06F119/08
CPCG01N25/20G01N33/383G06F30/13G06F30/23G06F2119/08
Inventor 刘毅魏永新何永胜范雄安张冲王文学赵凯崔腾洲王继孝王海波刘小强祝海霞胡筱张磊李海枫朱振泱
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES