Abstract
This paper presents a suggestion for the automation of the design procedures of bonded and unbonded prestressed concrete flexural members, according to the Brazilian (NBR 6118:2007) and French (Règles BPEL 91) norm specifications. Prestressing of concrete structures has been increasingly used, mainly due to its building advantages, as well as allowing reducing crack incidence and element dimensions by the use of more resistant materials. Structure is analyzed by a numerical model that employs a hybrid type finite element for planar frames, considering geometric nonlinearity, cyclic loading and composite construction. The computational algorithm implemented considers full, partial and limited prestressing situations, evaluating in each case decompression limit state, limit state of cracking, ultimate limit state and final prestressing state. Finally, two examples comparing design situations according to the Brazilian and French norms are presented.
Highlights
Prestressed concrete started to be scientifically developed in the beginning of the 20th century, and its use was consolidated in the 1940s
This paper presents a suggestion for the automation of the design procedures of bonded and unbonded prestressed concrete flexural members, according to the Brazilian (NBR 6118:2007) and French (Règles BPEL 91) norm specifications
Structure is analyzed by a numerical model that employs a hybrid type finite element for planar frames, considering geometric nonlinearity, cyclic loading and composite construction
Summary
Prestressed concrete started to be scientifically developed in the beginning of the 20th century, and its use was consolidated in the 1940s. It is intelligent because it profits from the mechanical strength both of iron and concrete, its main materials It is efficient because it is technically better than conventional solutions, producing safer and more comfortable structures. It is enduring because it promotes a long service life of its elements, and the structures may need low or no maintenance Characteristics, such as covering long spans, better control and reduction of deflections and cracking, application in pre-cast elements, structural recovery and reinforcement, and the use of prestressing in slender elements, including beamless flat slabs, are some of the advantages of the widespread application of this technology both in conventional and bold architectural design, as well as in small, medium, and large works. Crack width service limit state and ultimate limit state results are analyzed according to both norms
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