An identification methodology for a class of hysteretic structures

Arêde

Earthq Engng Struct Dyn

et al. 2013

SUMMARY The present work describes a shaking table experimental campaign specifically developed for the characterisation of the out‐of‐plane response of a full scale stone masonry façade. After the description of the specimen and the selection of the input motion presented in a companion paper (Part 1), the experimental campaign is illustrated and extensively described. The out‐of‐plane behaviour of the sacco masonry façade is presented in terms of displacements, velocities, and accelerations recorded during the shaking table tests. A one‐sided rocking response of the façade was observed prior to collapse. The impacts were clearly identified in the acceleration records. The façade overturning occurred with the expected failure mode, as predicted in the design of the test. Finally, some conclusions are drawn regarding the observed behaviour and particular features of this type of stone masonry constructions, which may influence the global behaviour of the façade. Copyright © 2013 John Wiley & Sons, Ltd.

Section: Analysis Of Experimental Datamentioning

confidence: 99%

Out‐of‐plane behaviour of a full scale stone masonry façade. Part 2: shaking table tests

Arêde

Earthq Engng Struct Dyn

et al. 2013

Struct Control Health Monit

“…1 Consequently, numerous attempts have been made to model the hysteretic behaviour of a system and to identify its properties from the measured time histories. [1][2][3][4][5] Among different identification algorithms, the recursive time-domain estimation techniques are found to be more efficient in incorporating measurements. Commonly used time-domain methods for non-linear system identification are least-square estimation (LSE), [6][7][8] extended Kalman filter (EKF) [9][10][11][12] and particle filter (PF).…”

Section: Introductionmentioning

confidence: 99%

Experimental verification of constrained minimum variance unbiased estimator for simultaneous input and state estimation of Bounded Input and Bounded Output (BIBO) type Bouc–Wen hysteretic structural system

Tamuly

Chakraborty

Das

2020

Constraint minimum variance unbiased estimator is improvised for simultaneous input and parameter estimation of the Bouc-Wen hysteretic system of a full-scale bridge pier. The essential structural properties in this case (i.e., bounded input and bounded output) are incorporated in the form of constraint conditions along with degradation and pinching effects. To demonstrate the efficiency of this algorithm, two different types of sigma points generation schemes (viz., unscented transformed points and cubature quadrature points) are presented here. First, the algorithm is validated using simulated response obtained from a single-bay single-storey reinforced concrete frame, whose hysteretic parameters are obtained by minimizing the error between the model and experimentally observed load-deformation characteristics. The rationale behind the use of experimentally observed hysteresis in simulation is to replicate the actual structure so that the realistic material behaviour is maintained. Once the algorithm is validated, its performance is further demonstrated using experimental results of a full-scale bridge pier, which is the main objective of this study. The numerical results presented in this paper clearly show the robustness of the proposed algorithm using unscented sigma points, which can identify both hysteretic properties and input excitation with sufficient level of accuracy.

Earthq Engng Struct Dyn

“…To have a physical meaning on the inelastic behavior of a structural member, on the basis of the observation of the gross response of several damaged structures, the deteriorating distributed element (DDE) model was proposed by Iwan et al . . This research proposed an idea to combine the signal analysis and a simple parametric model to examine the hysteretic behavior of a degrading structure through the separation of the response into mode‐like components.…”

Section: Introductionmentioning

confidence: 99%

Application of singular spectrum analysis to identify the degrading structure using deteriorating distributed element model

Loh

Chao

2012

Reinforced concrete structure may exhibit significant inelastic hysteretic behavior when subject to strong earthquake excitation. To investigate such an inelastic behavior, in this study, a new system identification technique is applied by using the deteriorating distributed element (DDE) model to simulate the hysteretic behavior of a degrading structure. Through the advanced signal processing technique, the multiple singular spectrum analysis (SSA) and the nonlinear SSA, the recorded inelastic restoring force of a deteriorating structure can be decomposed into several independent additive components in its sequentially degrading order and with decreasing weight. With each decomposed hysteresis loop, the model parameters of the DDE model are identified. The evolutionary properties of the progressive stiffness degradation behavior of reinforced concrete structure can be observed from the identified model parameters. Finally, comparison on the physical properties of the identified DDE model with respect to the seismic response data of the deteriorating structure is also discussed. The result shows that the proposed identification technique can have a good estimation on the seismic behavior of the degrading structure. Copyright © 2012 John Wiley & Sons, Ltd.