- Author
-
Stone, W. C.
|
Taylor, A. W.
- Title
- Predictive Model for Hysteretic Failure Parameters.
- Coporate
- National Institute of Standards and Technology, Gaithersburg, MD
- Book or Conf
- World Conference on Earthquake Engineering, 10th Proceedings. July 19-24, 1992,
A. A. Balkema/Rotterdam/Brookfield,
Madrid, Spain,
2575-2580 p.,
1992
- Keywords
-
reinforced concretes
|
bridges (structures)
|
earthquakes
|
parameters
|
failure
|
failure models
|
digital test records
|
system identification
|
regression analysis
- Abstract
- The ability to analytically predict the inelastic dynamic behavior of reinforced concrete bridge structures during earthquakes is predicated on the availability of an appropriate hysteretic failure model. To date, several such models have been implemented in research computer codes with little or no information available concerning the selection of appropriate coefficients and parameters for the solution of a specific type of reinforced concrete structure. A digital database of load-displacement histories was established for circular, spirally reinforced bridge column tests. A system identification analysis was performed on each specimen in which the error in cyclic absorbed energy was minimized by optimal selection of parameters in a tri-linear hysteretic failure model. Three parameters, comprising a stiffness degrading coefficient, a strength degrading coefficient, and a pinching coefficient, were employed in this study. Subsequent multivariable least squares regression analyses were conducted to correlate the variation of the model parameters with the specimens' physical properties. Regression equations were developed for the parameters alpha, betta, and gamma and explanations are offered as to the correlation of the parameters to material and geometric properties of the columns.