Institute of Fundamental Technological Research
Polish Academy of Sciences

Partners

Li Su

Dalian University of Technology (CN)


Recent publications
1.  Hou J., Li C., Jankowski Ł., Shi Y., Su L., Yu S., Geng T., Damage identification of suspender cables by adding virtual supports with the substructure isolation method, STRUCTURAL CONTROL AND HEALTH MONITORING, ISSN: 1545-2255, DOI: 10.1002/stc.2677, Vol.28, No.3, pp.e2677-1-19, 2021

Abstract:
Damage of bridge cables is mainly manifested as the decrease in cable forces. These forces are affected by the boundary conditions, cable length, cable stiffness, and cable appendages, making it hard to identify the cable forces. Based on the substructure isolation method, this study proposes an approach for cable force identification to judge cable damage by adding virtual supports to each cable so that the cables share the same length and boundary conditions. The cable forces can then be identified according to the relationship between the natural frequency and cable forces. The basic concept is that the boundary sensors are transformed into virtual supports by a linear combination of the convolution of measured responses to achieve the zero boundary response. A finite element model of a suspension bridge was used to validate the proposed method in a simulation. When the virtual supports were added to the cables, the relationship between the cable forces and the natural frequency was almost linear, and the cable damage could be successfully identified with 5% noise. Finally, the effectiveness of the proposed method was verified experimentally, and the natural frequency of the isolated cable substructure was confirmed to be a highly sensitive damage indicator.

Keywords:
cable damage, cable forces, natural frequency, structural health monitoring (SHM), substructure isolation method, virtual supports

Affiliations:
Hou J. - Dalian University of Technology (CN)
Li C. - other affiliation
Jankowski Ł. - IPPT PAN
Shi Y. - other affiliation
Su L. - Dalian University of Technology (CN)
Yu S. - other affiliation
Geng T. - other affiliation

Conference abstracts
1.  Hou J., Su L., Jankowski Ł., Cable force identification based on substructure isolation method, Structures16, The 2016 Structures Congress, 2016-08-28/09-01, Jeju Island (KR), pp.1-6, 2016

Abstract:
Aiming at this characteristic that the cable force identification precision is influenced by factors such as stiffness, boundary conditions and length, especially when the length of cable is short, boundary conditions cannot be simplified as fixed or pinned directly. Therefore, the method of adding virtual supports on the structure was proposed for cable force identification. The method of adding virtual supports on cable is based on the Substructure Isolation, through the change rule of natural frequency realize the structure damage identification. The virtual supports were constructed by the Substructure Isolation method using the liner combination of responses. By adding virtual supports realized that the substructures of cable were constructed, using the method can be additional virtual support in different position of the cable and get more virtual structures, combined with the frequency variation law of all virtual structures, the damage identification of cable can be carried out quickly and accurately.

Affiliations:
Hou J. - Dalian University of Technology (CN)
Su L. - Dalian University of Technology (CN)
Jankowski Ł. - IPPT PAN

Category A Plus

IPPT PAN

logo ippt            Pawińskiego 5B, 02-106 Warsaw
  +48 22 826 12 81 (central)
  +48 22 826 98 15
 

Find Us

mapka
© Institute of Fundamental Technological Research Polish Academy of Sciences 2021