COMPDYN 2017 15-17 June 2017, Rhodes Island / Greece
© 2017 EPFL
Seong-Hoon Hwang attended the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering. He presented a paper on: "Proposed Methodology for earthquake-induced loss assessment of instrumented steel frame buildings: building-specific and city-scale approaches"
ABSTRACT
On the basis of a library of building and/or component fragility curves, the second-generation of performance-based earthquake engineering utilizes probabilistic seismic demand models for obtaining accurate estimates of engineering demand parameters to estimate earthquake-induced losses in terms of probabilistic repair costs, life-safety impact, and loss of function due to damage to a wide variety of building structural and nonstructural components and building content. Despite that nonlinear response history analysis is a reliable tool to develop probabilistic seismic demand models for engineering demand parameters of interest, it typically requires substantial amount of time investment in developing detailed analytical model representations of a building as well as fairly high computational power. In that respect, the challenge of city-scale damage assessment still remains. This paper proposes a simplified methodology that does not require the development of numerical model representations of a building for earthquake-induced loss assessment. The proposed methodology is based on concepts of structural health monitoring and it can be implemented to quickly estimate the story-based engineering demand parameters (e.g., peak story drift ratios, residual story drift ratios, peak absolute floor accelerations) along the height of a steel frame building in the aftermath of an earthquake. The proposed methodology offers the advantage to be implemented in a city scale approach in order to facilitate rapid earthquake-induced loss assessment of steel frame buildings in terms of structural damage and monetary loss within a region. In this case, stakeholders can identify fairly quickly buildings that they consider potentially damaged following an earthquake event or scenario in an urban area. To illustrate the methodology for rapid earthquake-induced loss assessment at a city-scale we employ data from instrumented steel frame buildings in urban California that experienced the 1994 Northridge earthquake. Maps for generalized earthquake-induced losses (i.e., monetary losses and engineering demand parameters of interest) are developed with the use of geographical information system (GIS) for steel frame buildings around the Los Angeles area.