Application of DDE-model to enhancing seismic response of reinforced concrete frame

Abstract

In any assessment of the damage to a reinforced concrete structure, inelastic hysteretic behavior of structural member must be considered. In this study an advanced signal processing technique is used to investigate the physical features of an inelastic degrading hysteretic behavior of a reinforced concrete frame from its seismic response measurements. Through the singular spectrum analysis (SSA) and the nonlinear SSA (NLSSA), the original seismic response data is decomposed into independent additive components of decreasing weight which can be used for developing hysteresis loop in degrading order. The advantage of using NLSSA to extract the nonlinear feature form response data is demonstrated. Finally, the deteriorate distributed element (DDE) model is applied to simulate the damage pattern of the reinforced concrete frame with respect to each of the developed degrading hysteresis loop and to identify the degrading stiffness and equivalent damping ratio. Comparison on the physical indices between the developed DDE model and the recorded data is discussed. © The Society for Experimental Mechanics. Inc. 2012.