Identification Method for Pylon Scour Depth of Cable-stayed Bridges by Tracing Dynamic Index

Wen Xiong, Xiaxin Dong, Pingbo Tang, Xuefeng Zhang, Jianshu Ye

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

This paper proposed an identifying method of scour condition of cable-stayed bridge pylon by tracing the dynamic index. Firstly the quantitative relationship between the identification index and scour depth is theoretically simulated by a series of parametric study. Once the identification index is obtained based on the monitored dynamic performances during the bridge routine measurement, the scour depth of pylons at the moment of monitoring can be directly deduced by the pre-obtained quantitative relationship. In order to investigate the feasibility of this method, two identification indexes such as the natural frequency of bridge and deformation of modal flexibility were proposed. As a case study, the relationships between these two identification indexes and scour depth of pylon were carefully analyzed based on Finite Element (FE) model of Ningbo Zhaobaoshan bridge (a cable-stayed bridge). The results indicate that the pylon scour depth of cable-stayed bridges can be quantitatively identified by tracing the identification indexes. Especially, the indexes including the deformation of modal flexibility built by the vibration modes of vertical bending of girder and transverse bending of pylon show much more sensitive and better identification effects than those of other indexes. It can be concluded that the proposed identifying method for pylon scour depth by tracing the dynamic index has the advantages of accurate calculation logic, convenience, and good economical efficiency without underwater operation. The scour depth can be correctly predicted as long as the dynamic performances of bridges are accurately measured and traced.

Original languageEnglish (US)
Pages (from-to)145-155
Number of pages11
JournalHunan Daxue Xuebao/Journal of Hunan University Natural Sciences
Volume44
Issue number11
DOIs
StatePublished - Nov 25 2017

Keywords

  • Cable-stayed bridges
  • Dynamic index
  • Flexibility matrix
  • Mode of vibration
  • Natural frequency of vibration
  • Scour of pylons

ASJC Scopus subject areas

  • General

Fingerprint Dive into the research topics of 'Identification Method for Pylon Scour Depth of Cable-stayed Bridges by Tracing Dynamic Index'. Together they form a unique fingerprint.

  • Cite this