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Estimation method of temperature difference stress of mass concrete foundation and temperature difference stress of upper and lower floors

A large-volume concrete, temperature difference stress technology, applied in the direction of calculation, computer-aided design, special data processing applications, etc., can solve the problems of large difference in tensile stress, failure to consider the influence factors of water cooling, and error in stress estimation results, etc.

Active Publication Date: 2019-08-09
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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Problems solved by technology

[0004] In addition, studies have shown that the maximum stress of the dam is closely related to the water flow process. In the two cases of water cooling and no water cooling, the tensile stress formed by unit temperature drop is quite different. The influence factors of water cooling and the influence factors of the base elastic modulus are not accurate, and there are errors in the stress estimation results

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  • Estimation method of temperature difference stress of mass concrete foundation and temperature difference stress of upper and lower floors
  • Estimation method of temperature difference stress of mass concrete foundation and temperature difference stress of upper and lower floors
  • Estimation method of temperature difference stress of mass concrete foundation and temperature difference stress of upper and lower floors

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[0105] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0106] 1. Estimation of basic temperature difference stress

[0107] 1. Considering the primary and secondary cooling, the basic temperature difference stress:

[0108]

[0109] Normal concrete:

[0110]

[0111]

[0112] RCC:

[0113]

[0114]

[0115] Among them: F is the basic temperature difference stress, the unit is MPa; A 1 Influence coefficient of heat of hydration temperature difference; A 2 Influence coefficient of pouring temperature difference; E 1 is the elastic modulus of concrete in the middle stage of the second-stage cooling, in GPa; E 2 is the elastic modulus of concrete at the end of the second stage cooling, in GPa; E c is the final elastic modulus of concrete, in GPa; α is the coefficient of linear expansion, in 1 / °C; ΔT r is the heat of hydration temperature difference, here is the temperature differ...

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Abstract

The invention provides a foundation temperature difference stress estimation method and an upper-lower layer temperature difference stress estimation method for mass concrete. Each of a foundation temperature difference stress and an upper-lower layer temperature different stress is comprehensively estimated according to multiple factors such as a maximum concrete temperature, a concrete elasticity modulus, a pouring block length, a basic elasticity modulus and a water cooling condition, for example, a first stage and a second stage are watered for cooling, or the first stage is watered for cooling or not watered for cooling. A typical concrete thermodynamic parameter summarized by an academician Bofang Zhu and a common water cooling measure generally used in engineering are used, and a finite element computing method is used for verifying estimation results. Compared with existing estimation methods, the methods provided by the invention can achieve more accurate and reasonable estimation results, and can be applied to actual engineering for scientifically guiding engineering practice and improving engineering quality.

Description

technical field [0001] The invention relates to a method for estimating the temperature difference stress of a large-volume concrete foundation and the temperature difference stress of an upper and lower layer, and belongs to the technical field of water conservancy and hydropower. Background technique [0002] The temperature difference stress of the foundation and the temperature difference stress of the upper and lower layers are important indicators for the temperature control of concrete dams. The temperature difference of the foundation generally refers to the difference between the highest temperature and the stable temperature of the concrete within the scope of the foundation constraint. When the height-width ratio of the dam block structure is less than 0.5 or the long-term intermittent pouring block or foundation elastic modulus differs greatly from the concrete elastic modulus within the scope of the foundation constraint , the base allowable temperature differen...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/13G06F30/23G06F2119/06G06F2119/08
Inventor 张国新朱振泱汪娟王振红刘有志侯文倩
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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