Investigation of thermal stress of concrete gravity dams using probabilistic analysis

Mousavi, Seyed Mohammad (2017) Investigation of thermal stress of concrete gravity dams using probabilistic analysis. Masters thesis, University of Mohaghegh Ardabili.

Preview

Text (بررسی تنش‏های حرارتی در سدهای بتنی وزنی با استفاده از تحلیل‏ احتمالاتی) Seyed Mohammad Mousavi.pdf Download (990kB) | Preview

Abstract

Concrete is a material that is always weak against stretching and due to changes in the volume caused by temperature variations, it exhibits tensile stresses that cause cracking in critical situations. For this reason, the issue of thermal stresses and crack cracks in roller concrete dams is of particular importance. The features that are important in this regard are less important. Considering changes in the thermal conductivity coefficient and the modulus of elasticity of concrete relative to temperature, the variation of the concrete strength of the layers relative to their life, modeling the amount of cement hydration production variables with time, modeling the damper implementation schedule and considering the contiguous boundary conditions for different levels. This research is one of the cases in which all of these features have been tried in addition to the problem of the effect of ambient heat, At the same time, attention should be paid to more trust in the safe and economic construction of RCC dams. Different run speeds, starting in hot and cold seasons and stopping in cold and hot months of the year, preventing materials and the effect of changes in input parameters on critical responses it is considered as an effective parameter. For analysis and transient analysis and stress development, the ansys workbench component software has been used. The results of this study can be reducing the amount of tensions when considering the weight of the layers, the high efficiency of the stops in the hot months of the year to reduce the maximum core dam height, using the pre-cooling method to facilitate the implementation and appropriate stimulus in the warm months of the year, high return on start of run in cold seasons to reduce the maximum heat of the structure, the high influence of the stresses induced on the structure on the modulus of elasticity and the mechanical properties of the materials, high sensitivity to structural deformation relative to the thermal properties of materials and the effect of reducing thermal conductivity on the maximum body temperature of the dam.

Actions (login required)

View Item