Avaliacao dos Efeitos de Segunda Ordem em Edificios de Betao Armado

This work deals with the non-linear behaviour of framed reinforced concrete structures and its aim is to study the second order effects problem. Research in this area is still considered worthwhile given the complexity of the simplified methodologies for assessing those effects, according to the in current codes. A computer program was developed in order to carry out physical and geometrical non-linear analysis of reinforced concrete structures. The program was calibrated using theoretical experimental results. The problem of safety checks when employing non-linear analysis is discussed and a methodology is put forward designed to be globally coherent and more easily applicable. By using the computer program mentioned above, the results obtained when applying the additional eccentricity method in isolated elements are analysed, and the proposed rules on minimum slenderness are discussed. This method was chosen because it is the main simplified method of assessing second order effects proposed in most European codes. A comparative study with the simplified P-#delta# method is also carried out in order to clarify the differences resulting from their application. In conclusion, an algorithm is proposed seeking to combine the main advantages of the additional eccentricity and simplified P-#delta# method. The results of a parametric study are presented so that the quality of the proposed method can be assessed and in order to highlight the main problems associated with the use of the methods currently proposedAvailable from Fundacao para a Ciencia e a Tecnologia, Servico de Informacao e Documentacao, Av. D. Carlos I, 126, 1200 Lisboa / FCT - Fundação para o Ciência e a TecnologiaSIGLEPTPortuga