Abstract
Three dimensional finite element analyses is carried out to study the thermal stresses and displacements in double curvature concrete arch dams. By defining boundary conditions directly on the dam, this leads to a stiffer behavior. Hence two models one with rigid boundaries and other with lumped springs was developed subjected to thermal loads. An arbitrary spring stiffness of 1.0E+07 KN/m2 to 1.0E+11 KN/m2 is adopted for lumped springs. For the parameters adopted an arch dam is subjected to thermal loads for summer and winter temperatures. The temperature of 21.7°C and 11.10°C is adopted for summer and winter respectively. Under water temperatures in the reservoir are estimated. The performance of dam model with spring stiffness of 1.0E+11 KN/m is almost identical with rigid model. The stresses and displacements in dam in summer season are more compared to winter season. Maximum stresses are observed on downstream surfaces of dams hence much care should be taken while designing the downstream section of dam.
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