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Alpine Region of Mass Effects of the Concrete Surface Thermal Simulation Studies

Author: LiuWuJun
Tutor: ChenYaoLong
School: Xi'an University of Technology
Course: Hydraulic Structure Engineering
Keywords: Mass concrete Finite Element Method Temperature field Temperature stress field Surface insulation
CLC: TU755
Type: Master's thesis
Year: 2010
Downloads: 119
Quote: 1
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Abstract


Large concrete structures in the project is more widely used, the cracks due to temperature changes caused by long plagued the people's problems. Negative temperature in winter season or tuyu cold wave, the temperature gradient of the surface layer of concrete is very steep, so that the tensile stress of the concrete surface of the overrun and produce a lot of surface cracks still very short, especially when the age of the concrete, the tensile strength is still low , more easily cracks. Laying a certain thickness of the insulation board in the concrete surface of the concrete surface can effectively reduce the tensile stress, to prevent the cracks. Therefore, the study of mass concrete surface insulation board insulation effect is significant. Calculated based on the finite element method of the temperature field and thermal stress field of mass concrete theory as a platform for a large general-purpose software ANSYS APDL language preparation RCC gravity dam construction and operation period of the temperature field and thermal stress field The simulation program. The program is considered in the process of compiling the layered pouring RCC, construction intermittent, elastic modulus change, the process of adiabatic temperature rise, changes in ambient temperature, concrete creep, temperature field and stress of different factors such as water storage elevation of the dam field. Concrete pouring process of \When the concrete has not pouring, the unit is \process, the calculated results can be a true reflection of the real state of mass concrete. In this paper, an alpine region RCC gravity dam, the surface heat coefficient calculated without insulation plate coverage and different thickness of the insulation board covering the conditions under dam temperature field and thermal stress field, and specialized analysis to calculate the cold wave on concrete surface stress. The calculation results show that the laying 6cm thick XPS insulation board in the dam on the downstream face, long-term permanent insulation to the weakened concrete heat exchange with the outside world, the temperature of the concrete surface, so that the steepest part of the original surface concrete temperature gradient occurs insulation materials, leaving the rate of change of the temperature of the surface concrete mitigation gradient flattens, thereby reducing the winter or when the temperature of the surface layer of concrete stress suddenly encountered a cold wave, effectively prevent the generation of surface cracks. Also analyzed the thickness of the insulation board types, holding time, the annual temperature amplitude of the external environment on the concrete surface insulation effect, has a certain reference value to select the appropriate insulation board.

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CLC: > Industrial Technology > Building Science > Construction > The project and the type of work > Concrete and reinforced concrete works
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