Structural Damage Identification Using High Dimensional Model Representation
Date
2018
Authors
B. O, Naveen
Journal Title
Journal ISSN
Volume Title
Publisher
National Institute of Technology Karnataka, Surathkal
Abstract
Any engineering structure is subject to various internal and external factors which
may cause wear or malfunction due to deterioration, an incorrect construction process,
lack of quality control or environmental effects. To be able to observe these changes
in the material and to react in a proper way before serious damage is caused, the
implementation of a damage identification system is crucial. In the past, many
methods have attempted to identify damage by solving an inverse problem, which
inevitably needs an analytical model. However, often the construction of these
analytical model requires considerable effort in building a mathematical framework
with acceptable level of accuracy and reliability which makes these approaches less
attractive. In order to circumvent this complexity, this work presents a
computationally efficient approach in structural damage identification (SDI) using
high dimensional model representation (HDMR).
In general, most of the structural systems are simulated with the help of finite
element (FE) models to predict static as well as dynamic behaviour of the systems
with different boundary conditions. Therefore the FE models have to be in tune with
the experimental observation to facilitate any modifications in the systems so that the
future responses can be accurately predicted, and subsequently utilized in design
optimization. Thus, finite element model updating (FEMU) is effective in improving
the correlation between predicted and observed ones by correcting the inaccurate
modelling assumptions.
The proposed methodology involves an integrated finite element modeling,
development of response surface model using HDMR, establishment of objective
function, and minimization of the function using genetic algorithm. An attempt has
been made to reduce the computational effort with increase in the accuracy of updated
parameters.
The proposed methodology is applied in model updating of a simulated beam
and an existing reinforce cement concrete (RCC) box culvert structure. The results
have demonstrated that the HDMR based FEMU is a good candidate featuring
computational efficiency. Further to validate the proposed methodology in SDI, threecase-studies (an experimental beam, a frame structure and a bridge structure) have
been considered. The damage patterns, locations and severity obtained using the
proposed methodology are compared with the experimental results available in
literature, and are found to be in good agreement. Based on the study conducted, it
can be concluded that the HDMR based FEMU in SDI is computationally efficient.
Description
Keywords
Department of Civil Engineering, Finite element analysis, High dimensional model representation, Model update, Response surface method, Structural damage identification