Abstract:

In this paper, vulnerability curves of key building types in the Philippines are developed and presented. Vulnerability curves, expressed as damage ratio versus Modified Mercalli Intensity (MMI) scale, for each building type are derived using computational, empirical, and/or heuristic methods. In the computational method, nonlinear static pushover of each building model was carried out and the capacity spectrum method was used to compute the fragility curves and then the vulnerability curves are derived from assumed damage ratios. Empirical vulnerability curves are derived using available data on damage to buildings compiled from field surveys and reports after past earthquakes. Heuristic vulnerability curves are derived by processing opinion of structural engineers in the Philippines on the possible damage to buildings when subjected to different earthquake intensities. For most building types made from reinforced concrete and steel, computational curves are recommended while for building types made of wood, masonry, and/or light materials, empirical or heuristic curves are recommended. The set of vulnerability curves proposed represents a coherent set of damage functions across structural types, construction material, number of floors, and age of construction.