Structural Damage Analysis of Steel Special CBF and Steel Self Centering CBF Buildings

Steel special concentrically braced frames (SCBFs) are effective, economic and stiff lateral force resisting systems for steel structures. However, they have limited ductility capacity because of brace buckling. Steel self-centering concentrically braced frames (SC-CBFs) have been developed to have the effectiveness, economy and stiffness of SCBFs with increased lateral drift capacity and reduced residual lateral drift. A probabilistic structural damage assessment of SCBF and SC-CBF buildings is presented in this paper. The assessment shows the differences between the earthquake performance of SCBFs and SC-CBFs, and verifies the expected earthquake performance of SC-CBFs. Structural damage assessment is an essential part of performance based earthquake engineering (PBEE). In an earthquake structural damage assessment, the earthquake response of the structure is related to physical damage states observed in the structure after the earthquake. In this research, structural damage is considered as a combination of building damage (collapse/non-collapse and demolition/no demolition events) and damage of the braces of an SCBF or SC-CBF (repair actions corresponding to the damage).