Abstract
One barrier to adopting seismic loss estimation frameworks in New Zealand engineering practice is the lack of relevant fragility functions which provide probabilities of exceeding certain levels of damage (e.g. cracking of gypsum wallboards) for a given demand (e.g. interstorey drifts). This study seeks to address this need for four different building components; interior full-height steel-framed plasterboard partition walls, unbraced suspended ceilings, precast concrete cladding, and steel beam-column joints with extended bolted end-plate connections. Fragility functions were sourced from literature, and their potential for use in New Zealand is evaluated considering similarities in component detailing with local practices. Modifications to a number of fragility functions, including generalizations for easier adoption in practice, are proposed. A loss estimation case study of a 4-storey steel moment-resisting frame is performed to investigate the significance of fragility function selection. It is shown that the definition of damage states can have a noticeable influence on the assessment of incurred repair cost of individual building components. This indicates that fragility functions should be carefully selected, particularly if the performance evaluation of each individual component is of utmost importance. However, the observed difference in expected annual repair cost of the entire building was small, indicating that in cases where fragility functions are not readily applicable for use in New Zealand, other fragility functions may be used as placeholders without drastically altering the outcome of loss analysis for the entire building.
Highlights
Damage to building components, such as structural elements, partitions, and ceilings, have led to large losses associated with repair works, disruptions in building functionality, and injuries during past earthquake events [1,2,3,4,5,6,7,8]
This study aims to identify fragility functions from literature which are relevant for use in New Zealand
It can be seen that there is almost no difference between the adopted fragility functions and those of Mosqueda [22]. This is reasonable since both sets follow the same damage state definitions, and the addition of 4 new data entries is unlikely to change the fragility by Mosqueda [22] significantly since it is already based off 65 data entries
Summary
Damage to building components, such as structural elements, partitions, and ceilings, have led to large losses associated with repair works, disruptions in building functionality, and injuries during past earthquake events [1,2,3,4,5,6,7,8]. One rational means of quantifying likely losses is to adopt procedures such as the Pacific Earthquake Engineering Research center’s Performance Based Earthquake Engineering framework [10] This framework comprises of four steps, which are to (i) perform seismic hazard assessment to obtain annual rates of exceeding various levels of ground shaking intensity, (ii) use structural analysis to assess the building’s response to a given ground shaking intensity, (iii) predict damage in the building based on the building’s response, and (iv) estimate the resulting losses. As damage observed is often dependent on the detailing and design of the building components, these fragilities may not be readily applicable for use in New Zealand due to differences in engineering and construction practice This is considered to be one of the main barriers in adopting seismic loss estimation in New Zealand practice
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Bulletin of the New Zealand Society for Earthquake Engineering
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
