Sk. Kunnath et al., PARAMETER-IDENTIFICATION FOR DEGRADING AND PINCHED HYSTERETIC STRUCTURAL CONCRETE SYSTEMS, Engineering structures, 19(3), 1997, pp. 224-232
Hysteretic models are frequently used to predict the non-linear behavi
or of reinforced concrete structural systems. Such models are typicall
y characterized by control parameters that have to be calibrated from
observed experimental testing. A system identification methodology is
presented in this paper for determining the values of control paramete
rs in a continuously smooth hysteretic model for inelastic dynamic beh
avior of structural concrete systems, The technique is based on a modi
fied Gauss-Newton approach in which a non-linear relationship between
model parameters and the force-deformation or moment-curvature hystere
tic loops is assumed. The methodology is applied to an extended versio
n of the well known rate-dependent Bouc-Wen hysteretic model, Six cont
rol parameters are introduced into the model which influence the degra
ding characteristics and, therefore, represent the target parameters t
hat need to be optimized. The versatility of the approach is demonstra
ted through sample simulations of observed behavior which are drawn fr
om reinforced and partially prestressed concrete elements and subassem
blages including beams, columns and beam-column joints. Studies of con
vergence of the proposed algorithm and sensitivity of the model to ide
ntified parameters is presented. Copyright (C) 1996 Elsevier Science L
td.