The Eigenfunction Method for Determining Displacement Time History in Structural Dynamic Analysis

  • Bo Li Key Laboratory of Deep Underground Science and Engineering (Ministry of Education), Department of Civil Engineering, College of Architecture and Environment, Sichuan University, Jiuyanqiao Wangjiang Road, Chengdu, 610064, China
  • Mahesh M. Pandey Department of Civil and Environmental Engineering, University of Waterloo, University Avenue West, Waterloo, ON, Canada
  • Yang Lu Key Laboratory of Deep Underground Science and Engineering (Ministry of Education), Department of Civil Engineering, College of Architecture and Environment, Sichuan University, Jiuyanqiao Wangjiang Road, Chengdu, 610064, China
  • Kao-Shan Dai Key Laboratory of Deep Underground Science and Engineering (Ministry of Education), Department of Civil Engineering, College of Architecture and Environment, Sichuan University, Jiuyanqiao Wangjiang Road, Chengdu, 610064, China

Abstract

In condition monitoring of structures, acceleration time histories are usually recorded due to ease of instrumentation. In cases where the information about a displacement time history is required, the acceleration data needs to be integrated to obtain the velocity and then the velocity needs to be integrated to obtain the displacements. However, the numerical integration of the acceleration data usually introduces an unrealistic drift component to the velocity as well as displacement. This paper presents an eigenfunction method to derive velocity and displacement time histories from a given acceleration time history. The paper analyzes displacements in two case studies using the numerical integration as well as the proposed eigenfunction method. It is concluded that the eigenfunction method is a viable approach to derive the displacement information from the acceleration data.

Keywords: eigenfunction method, drift, displacement, structural dynamic analysis
Published online
2019-10-30
How to Cite
Li, B., Pandey, M., Lu, Y., & Dai, K.-S. The Eigenfunction Method for Determining Displacement Time History in Structural Dynamic Analysis. Periodica Polytechnica Civil Engineering. https://doi.org/10.3311/PPci.14179
Section
Research Article