Dynamic loading on flexible floating anticollision system due to head-on collision by uncontrolled vessel
The design of flexible floating anticollision systems (FFAS) against collision by uncontrolled vessels is based on quasi-static considerations, in which the maximum loading is taken to occur when the vessel is brought to a standstill and its kinetic energy is completely transferred to the strain and...
Saved in:
Main Authors: | , , , |
---|---|
Other Authors: | |
Format: | Article |
Language: | English |
Published: |
2020
|
Subjects: | |
Online Access: | https://hdl.handle.net/10356/139121 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Institution: | Nanyang Technological University |
Language: | English |
id |
sg-ntu-dr.10356-139121 |
---|---|
record_format |
dspace |
spelling |
sg-ntu-dr.10356-1391212020-11-18T08:18:30Z Dynamic loading on flexible floating anticollision system due to head-on collision by uncontrolled vessel Sun, Zhenxiang Zhang, Ningchuan Law, Adrian Wing-Keung Huang, Guoxing School of Civil and Environmental Engineering Engineering::Civil engineering Dynamic Loading Flexible Floating Anticollision System (FFAS) The design of flexible floating anticollision systems (FFAS) against collision by uncontrolled vessels is based on quasi-static considerations, in which the maximum loading is taken to occur when the vessel is brought to a standstill and its kinetic energy is completely transferred to the strain and frictional energy of FFAS. The dynamic loading during the collision process due to system response characteristics of the FFAS is typically ignored. In the present study, the authors demonstrated through an experimental investigation that it is critical to consider both quasi-static and dynamic loadings to design against possible failures of the system. The experimental investigation was performed as a case study for a FFAS to protect a chemical wharf at Zhangzhou Port, China. The system consisted of a row of floating buoys connecting and mooring with steel chains. Extensive physical modeling tests were performed to quantify the motion of the collided buoy and the tensions of selected block and mooring chains when the FFAS was struck by a 5,000-DWT(deadweight tonnage) vesselmodel with different initial velocities. The results showed that the transient impact force on the system had multiple dynamic peaks during the collision process. Most importantly, the maximum loading on the FFAS (and the reaction impact force on the vessel in the opposite direction) occurred at a dynamic peak prior to when the vessel was halted to a standstill, and the magnitude was larger than the maximum quasi-static loading based on energy transfer principle alone. Thus, the case study highlighted the importance of including the dynamic loading and responses into the design considerations of FFAS. 2020-05-15T08:53:50Z 2020-05-15T08:53:50Z 2018 Journal Article Sun, Z., Zhang, N., Law, A. W.-K., & Huang, G. (2018). Dynamic loading on flexible floating anticollision system due to head-on collision by uncontrolled vessel. Journal of Waterway, Port, Coastal, and Ocean Engineering, 144(3), 05018001-. doi:10.1061/(ASCE)WW.1943-5460.0000440 0733-950X https://hdl.handle.net/10356/139121 10.1061/(ASCE)WW.1943-5460.0000440 2-s2.0-85040769212 3 144 en Journal of Waterway, Port, Coastal and Ocean Engineering © 2018 American Society of Civil Engineers. All rights reserved. |
institution |
Nanyang Technological University |
building |
NTU Library |
continent |
Asia |
country |
Singapore Singapore |
content_provider |
NTU Library |
collection |
DR-NTU |
language |
English |
topic |
Engineering::Civil engineering Dynamic Loading Flexible Floating Anticollision System (FFAS) |
spellingShingle |
Engineering::Civil engineering Dynamic Loading Flexible Floating Anticollision System (FFAS) Sun, Zhenxiang Zhang, Ningchuan Law, Adrian Wing-Keung Huang, Guoxing Dynamic loading on flexible floating anticollision system due to head-on collision by uncontrolled vessel |
description |
The design of flexible floating anticollision systems (FFAS) against collision by uncontrolled vessels is based on quasi-static considerations, in which the maximum loading is taken to occur when the vessel is brought to a standstill and its kinetic energy is completely transferred to the strain and frictional energy of FFAS. The dynamic loading during the collision process due to system response characteristics of the FFAS is typically ignored. In the present study, the authors demonstrated through an experimental investigation that it is critical to consider both quasi-static and dynamic loadings to design against possible failures of the system. The experimental investigation was performed as a case study for a FFAS to protect a chemical wharf at Zhangzhou Port, China. The system consisted of a row of floating buoys connecting and mooring with steel chains. Extensive physical modeling tests were performed to quantify the motion of the collided buoy and the tensions of selected block and mooring chains when the FFAS was struck by a 5,000-DWT(deadweight tonnage) vesselmodel with different initial velocities. The results showed that the transient impact force on the system had multiple dynamic peaks during the collision process. Most importantly, the maximum loading on the FFAS (and the reaction impact force on the vessel in the opposite direction) occurred at a dynamic peak prior to when the vessel was halted to a standstill, and the magnitude was larger than the maximum quasi-static loading based on energy transfer principle alone. Thus, the case study highlighted the importance of including the dynamic loading and responses into the design considerations of FFAS. |
author2 |
School of Civil and Environmental Engineering |
author_facet |
School of Civil and Environmental Engineering Sun, Zhenxiang Zhang, Ningchuan Law, Adrian Wing-Keung Huang, Guoxing |
format |
Article |
author |
Sun, Zhenxiang Zhang, Ningchuan Law, Adrian Wing-Keung Huang, Guoxing |
author_sort |
Sun, Zhenxiang |
title |
Dynamic loading on flexible floating anticollision system due to head-on collision by uncontrolled vessel |
title_short |
Dynamic loading on flexible floating anticollision system due to head-on collision by uncontrolled vessel |
title_full |
Dynamic loading on flexible floating anticollision system due to head-on collision by uncontrolled vessel |
title_fullStr |
Dynamic loading on flexible floating anticollision system due to head-on collision by uncontrolled vessel |
title_full_unstemmed |
Dynamic loading on flexible floating anticollision system due to head-on collision by uncontrolled vessel |
title_sort |
dynamic loading on flexible floating anticollision system due to head-on collision by uncontrolled vessel |
publishDate |
2020 |
url |
https://hdl.handle.net/10356/139121 |
_version_ |
1688654663724826624 |