Lessons Learned from Seismic Collapse Assessment of Buildings for Evaluation of Bridg

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Lessons Learned from Seismic Collapse Assessment of Buildings for Evaluation of Bridge Structures

Author: Abbie B. Liel and Curt B. Haselton | Size: 219 KB | Format: PDF | Quality: Unspecified | pages: 12

Due to recent advancements in performance-based earthquake engineering methods, in modeling of complex nonlinear structural behavior, and in characterization of earthquake ground motions, it is becoming possible to directly simulate earthquakeinduced structural collapse. These simulations can be used to develop probabilistic descriptions of structures’ seismic collapse risk. This paper first summarizes recent
developments in assessment of seismic collapse risks for building structures, which apply nonlinear time-history analyses to predict when structural collapse occurs. In the second part, the discussion focuses on how the lessons learned from these building collapse risk assessments can be applied to predicting the seismic collapse risk of bridge structures. The paper proposes extending current assessments of bridge
seismic performance (which typically focus on prediction of structural damage prior to collapse) to include robust assessments seismic collapse safety. Key issues for
structural collapse assessment relate to ground motion scaling and spectral shape, creation of nonlinear structural simulation models (differing in certain critical characteristics from models used to predict pre-collapse response), and incorporating
uncertainties in ground motions and structural modeling.

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