內(nèi)養(yǎng)護(hù)高強(qiáng)混凝土渡槽溫控仿真研究
[Abstract]:Aqueducts are widely used in regional water transfer, diversion irrigation and other projects, as cross canal structures across streams, canals, roads and depressions. In modern large-scale aqueduct construction, a large number of high-strength concrete tank structure. High strength concrete has high cement content, low water-binder ratio, and high temperature shrinkage and self-shrinkage of concrete. In order to control the phenomenon of self-drying and self-shrinkage of high-strength concrete at early age, the occurrence and development of cracks can be prevented and controlled. The concept of "internal conservation" came into being. In this paper, by means of experiment, theoretical analysis and numerical simulation, the characteristics of internally cured high strength concrete, temperature, stress simulation calculation method and crack prevention method are studied in combination with the previous research results. The main work and conclusions are as follows: (1) based on the previous research results, the basic theory of cooling temperature and stress field of concrete pipe is adopted. The temperature and stress simulation calculation of cooling effect of water pipe is realized. (2) the internal curing method of replacing coarse aggregate with shale ceramsite is adopted to design the test scheme of adiabatic temperature rise of high strength concrete and carry out the adiabatic temperature rise calculation model. The results of comparison and analysis show that the composite index model has the best correlation with the measured results and can be used in temperature control design and simulation analysis. (3) the deformation of aqueduct concrete caused by external influence or its own characteristics is analyzed and discussed. It is pointed out that temperature deformation and dry shrinkage deformation are one of the main causes of concrete cracks in aqueduct. (4) combined with practical engineering, the conclusion of (3) is verified by means of three-dimensional finite element numerical simulation. The anti-cracking effect of anti-cracking measures, such as surface heat preservation and so on, is shown. The results show that the measures of water cooling and internal curing surface insulation can greatly reduce the possibility of cracking of concrete, but water cooling is apt to cause "pipe wall crack", and through economic analysis, The concrete crack prevention measures of aqueduct are determined, which provides a reference for temperature control and crack prevention of similar projects.
【學(xué)位授予單位】:華北水利水電大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TV672.3;TV544
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