Análise comparativa entre uma laje nervurada convencional e uma com trilhos em concreto protendido

Abstract

Various engineering works are carried out at all times faithfully following a particular project. However, in some cases these projects are changed due to specific conditions which the work is submitted. In the outside of the states capitals that reality is even more noticeable. So it is important to analyze the differences between the original and modified designs and evaluate the advantages and disadvantages of the changes. This work is based on a case study of a school built in Ceará, where its original design features a conventional ribbed slab molded in place, but that was executed with a distinctive design that features a ribbed slab associated with rails in prestressed concrete in one of its directions. The study compares the two slabs in terms of forces and displacements, using the finite element method through the SAP 2000 program with the two slabs as models of isolated slabs, simply supported on all four edges and subjected only to their own weights. In this study, the results show that, in structural and geometric terms, changing the original design of the slab was advantageous because the design of the changed slab is in favor of more security than the original slab and have reduced the maximum displacement. The changed slab also reduced overall height and the total concrete volume.