Foundation temperature difference stress and upper-lower layer temperature difference stress estimation methods for mass concrete

A technology of mass concrete and temperature differential stress, which can be used in calculation, computer-aided design, special data processing applications, etc., and can solve problems such as large difference in tensile stress, failure to consider factors affecting water cooling, and error in stress estimation results.

CN106844990AActive Publication Date: 2017-06-13CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2017-06-13

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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.
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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...

Examples

Embodiment Construction

[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...