In this work, a general method for the design of concentric braced steel frames (CBF) with active tension diagonal bracings, applicable to single- and multi-storey structures, is presented. The based on use an elastic modal analysis response spectrum, which carried out using appropriate modified stiffness bracings. reliability proposed validated through significant case studies, making series n...

Received: November 02, 2017 Revised: January 12, 2018 Accepted: January 17, 2018 Abstract: Introduction: Retrofit interventions are often performed by introducing in structures dissipative devices able to improve the global seismic response particularly in terms of energy dissipation capacity. In the case of Concentric Braced Steel Frames (CBF), these devices are generally introduced in the for...

This paper presents a method for computing a minimal bounding ellipsoid that contains the solution set to the uncertain linear equations. Particularly, we aim at finding a bounding ellipsoid for static response of structures, where both external forces and elastic moduli of members are assumed to be imprecisely known and bounded. By using the Slemma, we formulate a semidefinite programming (SDP...

This paper presents a method for computing a minimal bound that contains the solution set to the uncertain linear equations. Particularly, we aim at finding a bounding ellipsoid for static response of structures, where both external forces and elastic moduli of members are assumed to be imprecisely known and bounded. By using the S-lemma, we formulate a semidefinite programming (SDP) problem wh...