NEHRP Clearinghouse

Damageability in Existing Buildings.
Blejwas, T.; Bresler, B.
National Science Foundation, Washington, DC., August 1979, 88 p.
Identifying Number(s)
Relative hazard is evaluated by a method based on the concept of damageability, where damageability is defined as the level of damage that would occur to a building if it were exposed to a single natural hazard or a series of such hazards. The procedure developed here comprises three evaluations. First, a structural response analysis is conducted; for seismic response analysis a variation on available elasto-plastic or piecewise-linear analyses is developed. The damageability of a structure is then defined as a function of intensity of exposure; for seismic damageability, generalized displacement, or base shear may be used as a measure of intensity. Local damageability indices, determined for elements throughout the structure, are combined to form a global damageability index, i.e., an index that represents the damageability of the structure as a whole. Finally, seismic damageability of the structure is related to potential earthquake demand by inelastic response spectra. The force-displacement relationship for the equivalent single-degree-of-freedom system assumed for the quasi-static response analysis is compared to inelastic force-displacement curves from inelastic response spectra. The level of response for this equivalent system that corresponds to the particular spectrum is estimated. A third damageability index, cumulative damageability, is defined as a measure of cumulative damage to a structure from previous loadings, such as earthquake or fire loads.
CDC-6400 computers; Dynamic response; Computer programming; Buildings; Damage assessment; Earthquake engineering; Earthquake resistant structures; Stiffness methods; EPRESP computer program; Fortran 4 programming language; Predictions; Seismic hazard; Dynamic structural analysis