- Characteristics Affecting the Vulnerability of Soft Storey Mechanisms
- H.A. Beigi ; T.J. Sullivan ; G.M. Calvi ; C. Christopoulos
- Book Title / Journal: Proceedings of the 15th World Conference on Earthquake Engineering, Lisbon, Portugal
- Year: 2012 , Volume: , Series:
- Earthquake engineering
- Keywords: soft-storey ; post-yield stiffness ; concrete frame retrofit
- The seismic vulnerability of a six storey RC frame building typical of Italian construction practice from the 1970’s is examined in this work, initially considering two different infill configurations; the first considers full masonry infill and the second considers an open ground storey with full masonry infill above the first floor. Results of incremental dynamic analyses indicate that structures with uniform infill are less likely to collapse. However, it is also recognized that the need to retrofit structures with partial infill should depend on the seismic hazard and acceptable risk. Therefore, to provide insight into the factors affecting the vulnerability of such RC frame structures, the impact of P-Delta effects, post-yield stiffness ratio and ground storey column characteristics are investigated. Results are discussed and because p-delta effects and column axial load ratios are found to affect the vulnerability significantly, an innovative retrofit strategy that considers these characteristics is proposed.