scholarly journals Identification of a Nonproportional Damping Matrix Using the Finite Element Model Updating

2012 ◽  
Vol 26 (4) ◽  
pp. 86-91
Author(s):  
Cheon-Hong Min ◽  
Hyung-Woo Kim ◽  
Chang-Ho Lee ◽  
Sup Hong ◽  
Jong-Su Choi ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Model Updating ◽  
Element Model ◽  
Finite Element Model Updating ◽  
Damping Matrix ◽  
Nonproportional Damping ◽  
The Finite Element Model

scholarly journals Finite Element Model Updating of Reinforced Concrete Beams with Honeycomb Damage

2012 ◽  
Vol 58 (2) ◽  
pp. 135-151 ◽  
Author(s):  
Z. Ismail
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Finite Element Model ◽  
Model Updating ◽  
Element Model ◽  
Significant Loss ◽  
Reinforced Concrete Beams ◽  
Finite Element Model Updating ◽  
Finite Element Models ◽  
The Finite Element Model

Abstract A method of detecting honeycombing damage in a reinforced concrete beam using the finite element model updating technique was proposed. A control beam and two finite element models representing different severity of damage were constructed using available software and the defect parameters were updated. Analyses were performed on the finite element models to approximate the modal parameters. A datum and a control finite element model to match the datum test beams with honeycombs were prepared. Results from the finite element model were corrected by updating the Young’s modulus and the damage parameters. There was a loss of stiffness of 3% for one case, and a loss of 7% for another. The more severe the damage, the higher the loss of stiffness. There was no significant loss of stiffness by doubling the volume of the honeycombs.

Identification of non-proportional viscous damping matrix of beams by finite element model updating

2016 ◽  
Vol 24 (11) ◽  
pp. 2134-2148 ◽  
Author(s):  
Subhajit Mondal ◽  
Sushanta Chakraborty
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Model Updating ◽  
Random Noise ◽  
Current Method ◽  
Element Model ◽  
Finite Element Model Updating ◽  
Viscous Damping ◽  
Damping Matrix ◽  
Stiffness Matrices

A methodology has been proposed to estimate non-proportional viscous damping matrix of beams from measured complex eigendata using finite element model updating technique. Representation of damping through a proportional damping matrix ignoring the complexity of eigenvectors may not be appropriate when external damping devices are employed. The current literature of determination of non-proportional damping matrix demands measurement of a large number of complex modes which is extremely difficult in practice. A gradient based finite element model updating algorithm implementing inverse eigensensitivity method has been presented through a series of numerically simulated cantilever beams. The method can accurately predict the non-proportional damping matrix even if the measured eigenvectors are polluted with random noise. The novelty of the current method is that it can sustain a high level of modal and coordinate sparsity in measurement. The method assumes prior determination or updating of the mass and stiffness matrices.

Finite-element model updating of the traditional beam–column joint in Tibetan heritage buildings using uniform design

2020 ◽  
Vol 23 (9) ◽  
pp. 1890-1901
Author(s):  
Lu Dai
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Model Updating ◽  
Uniform Design ◽  
Element Model ◽  
Simplified Model ◽  
Finite Element Model Updating ◽  
Solid Model ◽  
Heritage Buildings ◽  
The Finite Element Model

The Que-Ti joint is the traditional beam–column connection in Tibetan heritage buildings and plays an important role in bearing and transferring load. The structure of the Que-Ti joint is very complicated, which makes it very difficult to build a refined solid model during the numerical simulation process. This means that a simplified model of the Que-Ti joint is required. In this article, we propose a finite-element model updating technique based on uniform design and apply this to the finite-element model updating of the Que-Ti joint. A simplified model of the joint was simulated using two uncertain parameters, and by constructing the uniform design matrix, the specific size of each component within the simplified model was then determined. The stress state of the simplified model was compared to the refined solid model, with results indicating that the stress and strain response of the simplified model had a small rate of error when compared with the refined solid model, which confirmed that the finite-element model updating based on the uniform design was effective and that the simplified model of the Que-Ti joint could be applied to the analysis of the structure as whole. A field measurement was also conducted to further verify the numerical simulation. This investigation provides essential information for the structural analysis of Tibetan heritage buildings.

Finite Element Model Updating of Existing T-Girder Bridge by Field Quasi-Static Generalized Influence Line

2012 ◽  
Vol 226-228 ◽  
pp. 1609-1613 ◽  
Author(s):  
Jing Bo Liao ◽  
Guang Wu Tang ◽  
Fei Pan
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Structural Damage ◽  
Model Updating ◽  
Element Model ◽  
Finite Element Model Updating ◽  
Element Analysis ◽  
Influence Line ◽  
Girder Bridge ◽  
The Finite Element Model

Finite element model updating is the important foundation of structural damage detection, condition assessment for engineering structure. A new method, for finite element model updating based on the quasi-static generalized influence line (QSGIL) residual objection, is presented to update the finite element model of beam-structure in order to improve the quality and precision of finite element analysis. Both of the theory and model experimental study show that the proposal method can efficiently update the finite element model in the previous study [1]. In this paper, the updating techniques are further developed to update the finite element model of the existing T-Girder bridge, the QSGIL of the updating model agrees very well with the field QSGIL of the existing bridge, which illustrates that the proposal methodology is promising in the practical bridge structure and other structures.

scholarly journals Experimental Studies on Finite Element Model Updating for a Heated Beam-Like Structure

2015 ◽  
Vol 2015 ◽  
pp. 1-15 ◽  
Author(s):  
Kaipeng Sun ◽  
Yonghui Zhao ◽  
Haiyan Hu
Keyword(s):  
Finite Element ◽  
High Temperature ◽  
Finite Element Model ◽  
Natural Frequencies ◽  
Model Updating ◽  
Element Model ◽  
Modal Parameters ◽  
Finite Element Model Updating ◽  
Time Varying ◽  
The Finite Element Model

An experimental study was made for the identification procedure of time-varying modal parameters and the finite element model updating technique of a beam-like thermal structure in both steady and unsteady high temperature environments. An improved time-varying autoregressive method was proposed first to extract the instantaneous natural frequencies of the structure in the unsteady high temperature environment. Based on the identified modal parameters, then, a finite element model for the structure was updated by using Kriging meta-model and optimization-based finite-element model updating method. The temperature-dependent parameters to be updated were expressed as low-order polynomials of temperature increase, and the finite element model updating problem was solved by updating several coefficients of the polynomials. The experimental results demonstrated the effectiveness of the time-varying modal parameter identification method and showed that the instantaneous natural frequencies of the updated model well tracked the trends of the measured values with high accuracy.

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