DAMAGE ASSESSMENT BASED ON MODAL ANALYSIS OF PIPE STRUCTURE

Authors

  • Sakhiah Abdul Kudus Department of Civil and Earth Resources Engineering, Graduate School of Engineering, Kyoto University, Kyoto, 615-8540, Japan
  • Yasuo Suzuki Department of Civil and Earth Resources Engineering, Graduate School of Engineering, Kyoto University, Kyoto, 615-8540, Japan
  • Masahide Matsumura Department of Civil and Earth Resources Engineering, Graduate School of Engineering, Kyoto University, Kyoto, 615-8540, Japan
  • Kunitomo Sugiura Department of Civil and Earth Resources Engineering, Graduate School of Engineering, Kyoto University, Kyoto, 615-8540, Japan

DOI:

https://doi.org/10.11113/jt.v80.10981

Keywords:

Steel pipe, Modal analysis, Finite element analysis, Mode shape, Natural frequency

Abstract

The degradation of steel pipe structures, especially thickness reduction due to corrosion is a common problem found in marine structures. This calls for an evaluation of the thin structure’s structural health condition to ensure its safety and reliability. This study investigates the effect of reduction in pipe wall thickness on the pipe structure’s dynamic behaviour using the fundamental modal parameter as the indicator for its health condition. A finite element analysis utilising Abaqus software has been adapted to model the problem. The corrosion problem was simulated by thickness reduction on six damage cases. The influence of the severity and position of damage on the observed mode upon the percentage of natural frequencies’ reduction and localisation of mode shape of the pipe structure are subsequently displayed. Four mode shapes and its corresponding natural frequency were extracted from baseline model to further evaluate the sensitivity of the selected mode towards the presence of damage. The study found that severe damage in pipe structure leads to significant reduction of natural frequency and localisation of mode shape in the vicinity of damaged region. The vibration results summarised in this paper may serve as a benchmark for researchers and as a reference for design engineers.

Author Biographies

  • Yasuo Suzuki, Department of Civil and Earth Resources Engineering, Graduate School of Engineering, Kyoto University, Kyoto, 615-8540, Japan
    Assistant Professor (Graduate School of Engineering)
  • Masahide Matsumura, Department of Civil and Earth Resources Engineering, Graduate School of Engineering, Kyoto University, Kyoto, 615-8540, Japan
    Associate Professor (Graduate School of Engineering)
  • Kunitomo Sugiura, Department of Civil and Earth Resources Engineering, Graduate School of Engineering, Kyoto University, Kyoto, 615-8540, Japan
    Professor (Graduate School of Engineering)

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Published

2018-06-04

Issue

Section

Science and Engineering

How to Cite

DAMAGE ASSESSMENT BASED ON MODAL ANALYSIS OF PIPE STRUCTURE. (2018). Jurnal Teknologi, 80(5). https://doi.org/10.11113/jt.v80.10981