“Time-building specific” seismic vulnerability assessment of a hospital RC building using field monitoring data

Abstract

14In the context of seismic vulnerability assessment of reinforced concrete (RC) buildings, the use 15 of field monitoring data constitutes a significant tool for the representation of the actual structural state, 16reducing uncertainties associated with the building configuration properties as well as many non-17 physical parameters (age, maintenance, etc.), enhancing thus the reliability in the risk assessment 18 procedure. In this study, the seismic vulnerability of existing RC buildings is evaluated, combining 19 through a comprehensive methodology, the numerical analysis and field monitoring data. The 20 proposed methodology is highlighted through the derivation of "time-building specific" fragility curves 21for an eight-storey RC structure (hospital building), built almost five decades ago, that is composed by 22 two adjacent units connected with a structural joint. The assessment of the dynamic characteristics is 23 performed using ambient noise measurements recorded by a temporary seismic network which was 24 deployed inside the hospital. The modal identification results are used to update and better constrain 25 the initial finite element model of the building, which is based on the available design and construction 26 documentation plans. Three-dimensional incremental dynamic analysis is performed to derive the 27 fragility curves for the initial as built model ("building-specific") and for the real structures as they are 28 nowadays ("time-building specific"). The initial "building-specific" curves are evaluated through their 29 comparison with conventional generic curves that are commonly used in risk assessment studies. 30Moreover, in order to enhance the reliability of the obtained results, the "time-building specific" fragility

Fragility analysis of a subway station structure by incremental dynamic analysis

“…Fragility function quantifies the probability of selected system responses exceeding a given damage measure (DM) at a specified ground motion intensity and it is a probabilistic approach to conduct the vulnerability and risk assessment of subway station structures. Traditionally, fragility curves have been established for buildings (Brunesi et al, 2015b;Kiani et al, 2016;Park and Kim, 2010), and improved fragility analysis methods are also proposed for surface structure (Banerjee et al, 2016;Karapetrou et al, 2016;Mandal et al, 2016). In this article, fragility analysis is extended to the lifeline system of the subway station structure during which a probabilistic framework is developed.…”

Current Challenges and Future Trends in Analytical Fragility and Vulnerability Modeling

“…For example, the ShakeMap system (Worden and Wald 2016) of the USGS provides GM data, which take into consideration information from recording stations and observed damage. For single structures, health-monitoring techniques using ambient noise or small earthquake records can be used to update the numerical model, which can lead to an improvement of the fragility functions (Karapetrou et al 2016). Exposure data can be accessed through large-scale initiatives, such as Hazus (also covering Canada), H2020 European projects project Seismology and Earthquake Engineering Research Infrastructure Alliance (SERA), the European Plate Observing System (EPOS) initiative, and the Global Earthquake Model.…”

The developments of the analytical fragility methods in seismic risk assessment – A review

“…It was concluded that the results obtained from the ambient vibration could be used to produce more reliable models based on their existing conditions. Furthermore, Karapetrou et al (2016) presented a comprehensive methodology for utilizing the obtained field data for a structure, i.e. dynamic properties, in the derivation of time dependent fragility curves.…”