Floors number influence on the instability parameter of reinforced concrete wall- or core-braced buildings

• Main Author: Ellwanger,R. J.
• Publication Date: 2013
• Format: Article
• Language: eng
• Source: Revista IBRACON de Estruturas e Materiais
• Download full: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1983-41952013000500006
• topic: instability; bracing structures; second order analysis

This work aims to investigate the floors number influence on the instability parameter limit α1 of buildings braced by reinforced concrete walls and/or cores. Initially, it is showed how the Beck and König discrete and continuous models are utilized in order to define when a second order analysis is needed. The treatment given to this subject by the Brazilian code for concrete structures design (NBR 6118) is also presented. It follows a detailed analytical study that led to the derivation of equations for the limit α1 as functions of the floors number; a series of examples is presented to check their accuracy. Results are analyzed, showing the precision degree achieved and topics for continuity of research in this field are indicated.