Title page for ETD etd-112999-093701

Type of Document Master's Thesis
Author Farmer, Anthony Lee
Author's Email Address afarmer@vt.edu
URN etd-112999-093701
Title Investigation Into Snap Loading of Cables Used in Moored Breakwaters
Degree Master of Science
Department Civil Engineering
Advisory Committee
Advisor Name Title
Plaut, Raymond H. Committee Chair
Holzer, Siegfried M. Committee Member
Rojiani, Kamal B. Committee Member
  • nonlinear dynamics
  • vibration
  • snap loading
  • breakwater
  • mooring lines
Date of Defense 1999-11-18
Availability unrestricted
A two-dimensional, nonlinear dynamic analysis is conducted on a moored breakwater

configuration to investigate snap loads in mooring lines. Breakwaters are structures used

to attenuate or eliminate waves and protect shorelines, harbors, and other natural and

man-made marine structures from wave damage. The breakwater in this investigation is

modeled both as a point mass and as a rigid body. Both models are subjected to free

undamped motions and forced undamped wave motion. Energy is dissipated through the

use of a coefficient of restitution applied when a mooring line becomes taut (i.e., reaches

its natural length). The mooring line is modeled as an inextensible cable with no axial or

bending resistance when slack. Snap loading arises when a mooring line transitions

suddenly from a slack condition to a taut condition. The analysis was conducted on a

breakwater configured upside down and hanging by two mooring lines. The length of the

mooring lines, coefficient of restitution, size and shape of the breakwater, initial position

of the breakwater, amplitude of wave forcing, ratio of vertical to horizontal forcing, and

frequency of forcing were all varied in the analysis. The results show that the rotations of

the rigid body and the wave forcing have a significant role in the analysis, indicating that

a rigid-body model for a moored breakwater under wave forcing is the more accurate model.

  Filename       Size       Approximate Download Time (Hours:Minutes:Seconds) 
 28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access 
  Chapter1.pdf 59.65 Kb 00:00:16 00:00:08 00:00:07 00:00:03 < 00:00:01
  Chapter2.pdf 73.93 Kb 00:00:20 00:00:10 00:00:09 00:00:04 < 00:00:01
  Chapter3.pdf 149.74 Kb 00:00:41 00:00:21 00:00:18 00:00:09 < 00:00:01
  Chapter4.pdf 479.81 Kb 00:02:13 00:01:08 00:00:59 00:00:29 00:00:02
  Chapter5.pdf 213.21 Kb 00:00:59 00:00:30 00:00:26 00:00:13 00:00:01
  Chapter6.pdf 454.37 Kb 00:02:06 00:01:04 00:00:56 00:00:28 00:00:02
  Chapter7.pdf 37.20 Kb 00:00:10 00:00:05 00:00:04 00:00:02 < 00:00:01
  Introduction.pdf 50.10 Kb 00:00:13 00:00:07 00:00:06 00:00:03 < 00:00:01
  References.pdf 82.16 Kb 00:00:22 00:00:11 00:00:10 00:00:05 < 00:00:01

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