Approximate Methods for Analysing the Effects of Creeping and Shrinkage of Reinforced and Prestressed Concrete Constructions

́Precisé procedures of analysis of so - called slow deformations, based on absence of negligence, are not suitable for practical calculations, due to its characteristic to be in demand of sufficient analyses. For that reason, there is the need for applying the approximative procedures and methods of analyses which give acceptable results, and they are still based on simplified mathematical relations. There are three procedures of that kind included in the exposition: method of simplified differential equation, modified Trost procedure and method of the idealistic modulus of elasticity, as well as their applicability on the exact example of the reinforced and prestressed concrete element.