NEHRP Clearinghouse
- Title
- Identification of the Serviceability Limit State and Detection of Seismic Structural Damage.
- File
- PB89122188.pdf
- Author(s)
- DiPasquale, E.; Cakmak, A. S.
- Source
- National Center for Earthquake Engineering Research, Buffalo, NY.; National Science Foundation, Washington, DC., June 15, 1988, 83 p.
- Abstract
- Damage analysis models based on equivalent modal parameters are used to identify the serviceability limit state for structures subjected to earthquake loads. A model for the analysis of seismic structural damage consists of a finite number of numerical indicators (damage indices) and of a procedure for their computation. A structure exhibits a nonlinear behavior when it experiences an earthquake. Nonetheless an equivalent linear structure can be defined. Damage indices can be defined from the vibrational parameters of the equivalent linear structure considered. In the first place, it is shown that the problem of identification of the serviceability limit state is equivalent to the problem of detection of seismic structural damage. A limit state can be defined as a surface in the space of the damage indices relative to the model considered. Experiments on small-scale models are analyzed to obtain an analytical definition of the serviceability limit state. Since many uncertainties are present in any damage analysis problem, a probabilistic definition is obtained, in terms of the probability that the structure considered is damaged after the seismic event. Finally, records from large-scale models and full-scale structures are analyzed.
- Keywords
- ; Earthquake resistant structures; Mechanical hysteresis; Vibration; Ductility; Graphs (Charts); Dynamic response; Ground motion; Loads (Forces); Seismic effects; Mechanical properties; Dynamic structural analysis