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Design and Application of Real Time Monitoring System for Moored Caisson

[+] Author Affiliations
M. Sri Krishna, Shen Qiang, P. G. Prasant

Zentech, Inc., Houston, TX

Paper No. OMAE2004-51231, pp. 479-490; 12 pages
  • ASME 2004 23rd International Conference on Offshore Mechanics and Arctic Engineering
  • 23rd International Conference on Offshore Mechanics and Arctic Engineering, Volume 1, Parts A and B
  • Vancouver, British Columbia, Canada, June 20–25, 2004
  • Conference Sponsors: Ocean, Offshore, and Arctic Engineering Division
  • ISBN: 0-7918-3743-2 | eISBN: 0-7918-3738-6
  • Copyright © 2004 by ASME


Tacoma Narrows Constructors (TNC) is building a new suspension bridge in Tacoma, close to Seattle, Washington State, USA. The new bridge will be built just south of the existing bridge mounted on two caissons, referred to as East Caisson (Tacoma side) and West Caisson (Gig Harbor side). Each caisson is about 80’ wide and 130’ long in plan. The caissons are moored in place in high currents in the Narrows by two sets of mooring lines on each of them — lower set and upper set. The target positions of the new caissons are very close to the existing pier. Therefore the motions of the caisson are very critical for the success of the project and the final touchdown position of the caisson is also of main concern. The mooring monitoring and advisory system ZenMAS has the capability of monitoring the performance of the caisson in currents by acquiring real time data from instruments. Real time line tensions and GPS data are read. The instantaneous tension in each of the mooring lines is measured, recorded and reported. Using the real time GPS data, the program reports the translations and rotations of the caissons. There are warnings when any of these are exceeded beyond allowable limits. ZenMAS also has the capability to function as a simulation tool. Future what-if scenarios can be studied using this software and any necessary corrective measures taken. The analysis capabilities of ZenMAS include static and dynamic analysis using the Motion Simulator program MOTSIM [2]. Graphical representation of instantaneous caisson position and summary and detailed output and results are available from the program. A discussion on how this system was designed, typical inputs, outputs, and comparison to actual measured values is made in this paper.

Copyright © 2004 by ASME



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