جستجوی مقالات مرتبط با کلیدواژه « سد بتنی قوسی » در نشریات گروه « مهندسی آب »

Arched concrete dams are three-dimensional structures that, in terms of their special shape resembling a huge shell, transfer the water pressure from the tank to their stone supports. Besides the forces of weight, hydrostatic pressure and thermal stresses, another significant force that the dam's structural system must withstand is the dynamic forces generated by earthquakes. In such dams, there is a possibility of nonlinear behavior due to the change in the location of the two faces of the contraction joints, cracking, corrosion, or non-linear behavior of the concrete of the dam body depending on the intensity of the earthquake. Dynamic analysis of time history, assuming that the dam body is an integrated structure with elastic behavior, usually leads to the creation of significant tensile arch stresses in the upper levels of the dam, which is not in accordance with reality. Since the arch dams are built as ridge blocks, due to the opening and closing of the contraction joints during the earthquake, the released tensile stresses and internal forces are redistributed from the arch performance mode to the ridge performance. As a result, by reducing the level of tensile stresses and energy consumption as a result of joint closure, the risk of concrete cracking and dam destruction is greatly reduced.