scholarly journals Identification of Internal Loss Factors for SEA Using FEM and Modal Strain Energy Method for Bead Panels with Viscoelastic Damping Layers

2012 ◽  
Vol 78 (790) ◽  
pp. 1936-1947
Author(s):  
Takao YAMAGUCHI ◽  
Takuya KURAKAMI ◽  
Toshiaki FUKUSHIMA ◽  
Mohamad TARIQ ◽  
Yasuaki MIYAZAKI
Keyword(s):  
Energy Method ◽  
Strain Energy ◽  
Viscoelastic Damping ◽  
Modal Strain Energy ◽  
Modal Strain Energy Method ◽  
Internal Loss ◽  
Strain Energy Method ◽  
Loss Factors

Infrastructure Sustainability

2011 ◽  
pp. 186-201
Author(s):  
Hoi Wai Shih ◽  
David Thambiratnam ◽  
Tommy Chan
Keyword(s):  
Energy Method ◽  
Strain Energy ◽  
Health State ◽  
Modal Strain Energy ◽  
Structural Health ◽  
Modal Strain Energy Method ◽  
Modal Flexibility ◽  
Before And After ◽  
Composite Bridges ◽  
Strain Energy Method

Assessing the structural health state of urban infrastructure is crucial in terms of infrastructure sustainability. This chapter uses dynamic computer simulation techniques to apply a procedure using vibration-based methods for damage assessment in multiple-girder composite bridges. In addition to changes in natural frequencies, this multi-criteria procedure incorporates two methods, namely, the modal flexibility and the modal strain energy method. Using the numerically simulated modal data obtained through finite element analysis software, algorithms based on modal flexibility and modal strain energy change, before and after damage, are obtained and used as the indices for the assessment of structural health state. The feasibility and capability of the approach is demonstrated through numerical studies of a proposed structure with six damage scenarios. It is concluded that the modal strain energy method is capable of application to multiple-girder composite bridges, as evidenced through the example treated in this chapter.

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