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If for each stage of production a certain product or quality is acceptable,then in the design stage we can easily assume that this product or quality is achieved by the least expensive production sequence if the components fulfill the quality requirements.A calculation of the cost of production should then be based on this assumption. The involved components and their quantity can be obtained from a calculation in which the total profitability of all variants is considered.
In this tutorial we have composite beams that have been defined using a concrete material with full elastic modulus (material nr. 2 in this tutorial),but where tensional forces occur in the concrete for the design combinations.Here we should calculate the stresses using cross-sectional values for the cracked state (structural steel + reinforcement).
The command STRE can not handle the cracking of concrete. How to deal with sections that are defined with an effective concrete part (full elastic modulus),but where the concrete will crack in the design combination is explained in the following section.
The effect of cracking of concrete at the inner supports can be considered in the global analysis according toDIN EN 1994 5.4.2.3 (2) resp. (3) by using the bending stiffness of the cracked composite section in the areasadjacent to the supports. For this we define a second concrete material with a reduced elastic modulus of E = 300 N/mm². d2c66b5586