Análise comparativa pelo método dos elementos finitos de modelos tridimensionais de um edifício alto em concreto armado com sistema estrutural tubular aporticado e núcleo central

Abstract

In recent years, great advances in the computational area related to the analysis of building structures have allowed the development of softwares to analyze structures of tall buildings. However, most of the software has been used considering the complete structure with all loads acting simultaneously. Currently the use of the sequential analysis for structures of tall buildings is being more used. This work is in this line of research; it is analyzed a structure of 30 floors with framed tubular system and central core using four distinct three-dimensional structural models. In the two first models (NOT SEQUENTIAL and NOT SEQUENTIAL NRD) the total load is considered acting simultaneously in the complete structure; in the two last (SEQUENTIAL and SEQUENTIAL NRD) the structure is loaded gradually along its construction; consequently, stage of construction and loading are being taken in account. The SAP2000 software is used to perform the three-dimensional analysis with the Finite Elements Method. The analyzed models are composed of frame elements (beams and columns) and shell elements (slabs and central core). Two comparative analyses between the NOT SEQUENTIAL and NOT SEQUENTIAL NRD models are made. In the first one (vertical loads only), forces and moments in the beams, columns, slabs, central core and supports in the foundation are analyzed; in the second one (horizontal loads), nodal displacements and indexes for lateral displacements of the structure are discussed. Tables and graphics with respect to results are shown in both analyses. For the SEQUENTIAL and SEQUENTIAL NRD models just one comparative analysis is made, the relative to the vertical load, which is analogous to the one made for the NOT SEQUENTIAL and NOT SEQUENTIAL NRD models. Tables and graphics relative to gotten results are also shown. With the results obtained for the four models, it is discussed the viability of using sequential analysis to analyze tall buildings of small and large size with the currently available microcomputers.