Análise de sistemas estruturais metálicos em arco para centros esportivos

Abstract

In this work, a study of the variation of steel consumption rates for various arrangements of arch steel structures to sports centers was carried out. Several models were designed with different geometries and bonding conditions. These models were divided into three groups or structural systems, in order to determine the most efficient from the material consumption point of view. By varying some basic parameters of the structural design of a gymnasium, such as the span of the arches and the spacing between curved frames, the models were designed along the STRAP® computer program. The structural design was done based on the provisions set forth in the technical standard ABNT NBR 8800:2008. After the calculation of the models, it was verified that the steel rate can suffer great variations from one system to another and, for the same system, it varies considerably in relation to the span and the spacing. For a given system and a certain span, it should be noted that the use of small spacing between frames, in order to decrease the load on each curved frame, can cause great steel rates. It has been found that this phenomenon occurs due to the limitation of the slenderness of compressed members. On the other hand, large spacing results in large surrounding areas that, in turn, require larger sections to resist soliciting efforts. Thus, there is an intermediate or optimal spacing that offers a lower rate of material consumption, allowing for the elaboration of more economical structural projects.