Abstract: In assessments of the seismic performance of buildings, nonlinear dynamic analysis (NLDA) has proved to be the most realistic, suitable, sophisticated, numerical tool to estimate the response of a structure as a function of time. When NLDA is used to assess the seismic response, the input is generally a group of accelerograms that can be recorded, synthetic or both. If NLDA is performed by increasing the ordinates of the selected accelerograms, it is known as incremental dynamic analysis (IDA). IDA can be used to obtain curves relating a measure of the seismic response of a structure (displacement at the roof, maximum inter-story drift, etc.) to a variable that describes seismic intensity, such as peak ground acceleration (PGA). The IDA has been used as the most appropriate tool for assessing damage in structures subjected to dynamic actions. Several damage indices can be calculated from the dynamic response of a structure, and are related to a reduction in the capacity of buildings’ structural elements. Some studies have proposed damage indices for reinforced concrete and steel buildings, considering parameters such as displacement ductility, strength and stiffness degradation, energy dissipation, cyclic fatigue, change in the natural period of the structure, or a combination of the above parameters. Most of the damage indices proposed to date take values in the range of 0 to 1, where 0 indicates no damage and 1 collapse. Park and Ang proposed one of the most frequently used seismic damage indices for reinforced concrete buildings, which considers both the maximum structural response and the cyclic load effect.
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Authors:
S.A. Díaz a,c, L.G. Pujades a, A.H. Barbat b, Y.F. Vargas a, D.A. Hidalgo-Leiva.