Sizing of Stiffness Parameters of Reinforced Concrete Structuresin Finite-Element Dynamic Calculation of Facilities
The article presents results of the numerical analysis of the design scheme of a large-span reinforced concrete structure. The aim of calculation was to determinethe frequency of the first tone of own vibrations of the facility which seemed the most dangerous among the causes of occurrence of resonance phenomena.Presented results of the checking dynamic calculation of the large-span structure were compared with the data of in-place tests of the structure that made itpossible to establish the correctness of sized stiffness parameters of the calculation scheme. On the basis of the work conducted, it is established that forevaluating the frequency of own vibrations of the structure for matching the results of observations, the stiffness of finite elements in the numerical calculationshould take into account the dynamic modulus of concrete elasticity. The checking of applicability of various formulas of approximation of the «initial - dynamicmodulus of elasticity» dependence for assigning a value of the dynamic modulus of concrete elasticity in numerical calculations is also made.