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|Title:||Simplified approach based on the natural period of vibration for considering second-order effects on reinforced concrete frames|
|Author:||Reis, Daniel G.|
Siqueira, Gustavo H.
Vieira Junior, Luiz C. M.
Ziemian, Ronald D.
|Abstract:||Recent studies have demonstrated the existence of a relationship between a structures susceptibility to second-order effects and its natural period of vibration (T) given that both these properties are fundamentally dependent on the structure stiffness and mass properties. The main advantage of the use of this characteristic is that T can be obtained easily by the existing structural analysis software. In this study, different formulations are developed in order to propose an amplification factor (χT) to multiply first-order analysis results and satisfactorily obtain results of a second-order analysis. These formulations are based on D’Alembert’s principle, Rayleighs method, and the use of generalized coordinates to represent the dynamic displacement of flexible structures. It is observed that χT provides values closer to and in fact, more conservatively than, those obtained by the conventional simplified methods currently used by structural design engineers. Thus, the amplification factor χT, which is based on the natural period of vibration, is proposed to be used as (i) an indicator of a structure susceptibility to second-order effects and (ii) an amplification factor to describe the second-order effects on reinforced concrete frames|
|Editor:||World Scientific Publishing|
|Appears in Collections:||FEC - Artigos e Outros Documentos|
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