Structural Performance on the Self-centering Connections with Different Conditions of PT Strands

Abstract

Structural Performance on the Self-centering Connections with Different Conditions of PT Strands Steel moment frames;Beam-to-column connection;Self-centering;Posttensioning force;PT strands; In this study, cyclic loading analysis was conducted in order to understand the behavior of self-centering connections based on the number of PT(posttensioning) strands and initial posttensioning force. The initial posttensioning force needs to be above the yield moment of an angle for obtaining noticeable self-centering effect and it is proper that decompression moment ratio needs to be below 0.35 to minimize the residual displacement of major elements. As the number of PT strands increased, self-centering capacity also improved since initial posttensiong force in each PT strand has been decreased. It is also appropriate that initial posttensiong force needs to be less than or equal to 75% of yield strength of PT strands.