13.13: Earthquake loss assessment of steel moment‐resisting frames designed according to EC8: Fid-Bau Portal

13.13: Earthquake loss assessment of steel moment‐resisting frames designed according to EC8

Macedo, Luís / Castro, José Miguel

ABSTRACTThe development of damage in buildings is implicit in the seismic design process. However, stakeholders and building owners generally have the perception that code design provisions ensure safe and minor damaged buildings for any seismic intensity level. It is therefore crucial to provide support decision information, which can help stakeholders and building owners taking informed selection of design opinions. Most recent design and assessment standards/guidelines define several performance levels seeking to ensure that structures exhibit appropriate behaviour and protection at different seismic intensity levels. Moreover, for steel moment‐resisting frames (MRFs), EC8‐3 defines the building performance acceptance criteria at different performance levels by ensuring that local deformation demands are lower than pre‐defined local deformation capacities. The main objective of the research presented in this paper is to evaluate the expected direct economic seismic losses of steel moment‐resisting framed structures designed according to Eurocode 8. To this end, the PEER PBEE methodology with the improvements proposed by [1] was implemented and used. A set of 30 archetype buildings, representative of the current building stock, were designed according to Part 1 of Eurocode 8 (EC8‐1) using three different behaviour factors (q). The EC8 proposed upper limits for the behaviour factor (q) and the behaviour factor obtained from an Improved Force‐Based Design (IFBD) procedure have been used [2]. The expected economic losses and its disaggregation were evaluated for the EC8‐1 and EC8‐3 seismic intensity levels, allowing in this way to characterize the performance with improved seismic performance metrics which can help stakeholders and building owners to take their decisions.