One-way slabs. Modelling and comparison of structural solutions with lattice and pre-tensioned joists 

Abstract

The main objective of this work is the development of a methodology for decision-making on the structural typology of floors, combining steel consumption and environmental impact to obtain the optimal structural design. This methodology focuses on the development of a spreadsheet under the criteria established by current regulations. Based on the required dimensions of the building to be studied, a comparative study of the different cases that may occur can be carried out, obtaining the most appropriate one in each case. The work focuses on unidirectional slabs; more specifically those that incorporate prefabricated elements, such as the reinforced and prestressed joist. The characteristics of the joists are obtained from technical sheets supplied by the manufacturer. From the efforts that the beams support in each case, the amount of steel per square meter of slab is calculated, both in reinforced and prestressed joists. In addition, the CO2 emissions produced in the treatment of steel are analyzed. The calculations are made for a slab with a depth of 30 centimeters and a series of permanent and variable loads fixed from the beginning. The results obtained are expressed in the form of a table or graph in a way that simplifies and makes the choice as easy as possible. The results achieved show that a bad design can produce up to 191% more steel consumption and therefore a considerable increase in emissions. 

Modelling structures | Reinforced concrete | Pre-tensioned joists|  Lattice joists | Economic analysis| Global warming 

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