Abstract
Existing reinforced concrete buildings lacking details for ductile response during earthquake shaking represent a significant life safety risk in high seismic zones around the world. The poor seismic performance of these non-ductile concrete buildings is evident from recent earthquakes in Chile, New Zealand and Japan. Seismic rehabilitation of these existing buildings plays an important role in reducing urban seismic risk; however, with the massive inventory of existing concrete buildings and the high costs of seismic rehabilitation , it is necessary to start by identifying and retrofit ting those buildings which are most vulnerable to collapse. Numerous sources of uncertainty complicate the ability to identify buildings which are vulnerable to collapse. For this reason, it is important to develop estimates of collapse probability to account for all significant sources of uncertainties. This chapter will introduce the concept of collapse indicators , design and response parameters that are correlated with “elevated” collapse probability. The methodology for identifying collapse indicators is based on results of comprehensive collapse simulations. Appropriate collapse indicators and corresponding limits are evaluated by seeking trends between probability of collapse and collapse indicators . This chapter will discuss significant challenges which pose a barrier to the assessment of collapse indicators that are applicable for the wide range of existing concrete buildings.
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Acknowledgments
This work is supported in part by the National Institute of Standards and Technology through the NEHRP Consultants Joint Venture Program and National Sciences and Engineering Research Council of Canada through the Canadian Seismic Research Network. Any opinions, findings, and conclusion or recommendations expressed in this work are those of the authors and do not reflect those of the organizations noted here.
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Elwood, K.J., Baradaran Shoraka, M., Yang, T.Y. (2014). Collapse Probability of Existing Concrete Buildings: The Evolution of Seismic Rehabilitation in North America. In: Fischinger, M. (eds) Performance-Based Seismic Engineering: Vision for an Earthquake Resilient Society. Geotechnical, Geological and Earthquake Engineering, vol 32. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-8875-5_31
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