Evaluation of Failure Capacity of Offshore Riser Protectors Under Vessel Impact

2018 ◽  
Vol 18 (2) ◽  
pp. 280-290
Author(s):  
Zubair I. Syed ◽  
Mohd S. Liew ◽  
Shaikh A. Rahman ◽  
Dinesh K. Palaniandy
Keyword(s):  
Vessel Impact

Bridge pile damage upon vessel impact

1984 ◽  
Vol 18 (5) ◽  
pp. 931-935 ◽  
Author(s):  
Kenneth N. Derucher
Keyword(s):  
Vessel Impact

Ship Collision with Bridges

1993 ◽  
Author(s):  
Ole Damgaard Larsen
Keyword(s):  
Prevention Measures ◽  
Collision Risk ◽  
Protection Measures ◽  
Planning And Design ◽  
Federal Highway ◽  
The Usa ◽  
Ship Collision ◽  
Average Size ◽  
Existing Bridges ◽  
Vessel Impact

<p>Any struoture in navigable waters constitutes a hazard to shipping and is itself vulnerable to damage or destruction in the event of vessel collision. Worldwide vessel traffic and the average size of vessels continue to lncrease. At the same time, ever more bridges crossing navigable waterways are being planned and constructed, sometimes with inadequate navigation clearance and/or lnadequate protection. <p> The objective of this publication is to provide information and guidelinesfor engineers charged with the planning and design of new bridges, navlgation channels, and prevention and protection measures. Lt offers advice on up­grading and retrofrtting existing bridges and navigation channels. And lt provides the means to evaluate the safety of bridges, vessels, persons and the environment. <p>After reviewing some basics o! navigatlon and vessel traffic, and consider­ing risk acceptance and collision risk, the publication examines vessel impact forces on bridges and proposes appropriate bridge design criteria. Prevention measures, such as regulations and management systems. And protectlon measures and systems are also described. Major international research projects have provided the analytical basis for the publication, including the development of vessel collision guide specifi­c-atrons for the Federal Highway Administration in the USA and the vessel colllsion design crrteria developed for the Great Bell Crossing in Oenmark. <p>Prepared by Ole Damgaard LARSEN, Chairman of the IABSE Working Group "Ship Collision with Bridges'', lhis 132 page publlcation is a must for any engineer dealing with structures in navigable waters.

Investigation of the Cost of Future Naval Amphibious Capability

2015 ◽  
Author(s):  
Andrew J. Jones ◽  
Rob Armstrong
Keyword(s):  
Task Group ◽  
Second Stage ◽  
The Creation ◽  
Two Stages ◽  
Vessel Impact ◽  
The Cost ◽  
The Impact

Through the creation of a large number of concept designs, the cost and vessel impact of deploying and supporting amphibious operations has been investigated. The investigation has looked at capabilities such as the transportation and delivery of vehicles, landing craft, aviation and embarked troops in a number of platform types such as LPDs, LHDs and Ro-Ros. A series of trends describing the costs of the capability have been investigated to estimate the cost of individual capabilities within a design. Over the timeframe of the study, vessel manning is predicted to change and a method of predicting the crew requirement has been developed to investigate the impact of reduced manning on amphibious platform designs. This is the first of two stages of work; in the second stage the requirements for a task group will be investigated to determine the best way to deploy capability at a fleet level.

Risk Analysis of Vessel-Bridge Collision Based on AASHTO Method

2012 ◽  
Vol 204-208 ◽  
pp. 2218-2223
Author(s):  
Yi Song Zou ◽  
Shan Zhong ◽  
Yin Hui Wang ◽  
Jun Hua Wu
Keyword(s):  
Risk Analysis ◽  
Pile Group ◽  
Collision Risk ◽  
Southeast Coast ◽  
Collision Problem ◽  
Analysis Theory ◽  
Annual Probability ◽  
Collision Prevention ◽  
Vessel Impact ◽  
Model Algorithm

One bridge in the southeast coast was cited as an example and the risk analysis theory was introduced into the study of vessel-bridge collision problem of the bridge. From the survey of the current situation development in the bridge site area and 5000 tons collision-prevention requirements, the annual probability of collapse of the bridge in the year 2020 is over the criterion by the AASHTO model algorithm. In accordance with the AASHTO acceptance criteria for vessel-bridge collision risk, the mentioned vessel collision risk of the bridge was not acceptable. In this paper, based on “m” method and FLAC3D program, the research on horizontal bearing capacity of pile group of one bridge in the southeast coast under vessel impact is performed, and the effects of the anchor is considered, which is significant for the risk analysis and bridge anti-collision study.

Laboratory Tests and Numerical Simulations of CFRP Strengthened RC Pier Subjected to Barge Impact Load

2015 ◽  
Vol 15 (02) ◽  
pp. 1450037 ◽  
Author(s):  
Yanyan Sha ◽  
Hong Hao
Keyword(s):  
Reinforced Concrete ◽  
Structural Damage ◽  
Impact Load ◽  
Numerical Models ◽  
Impact Resistance ◽  
Bridge Piers ◽  
Impact Loads ◽  
Bridge Structures ◽  
Cfrp Composite ◽  
Vessel Impact

Bridge piers are designed to withstand not only axial loads of superstructures and passing vehicles but also out-of-plane loads such as earthquake excitations and vessel impact loads. Vessel impact on bridge piers can lead to substantial damages or even collapse of bridge structures. An increasing number of vessel collision accidents have been reported in the past decade. A lot of researches have been conducted for predicting barge impact loads and calculating structural responses. However, in practice it is not possible to design bridge structures to resist all levels of barge impact loads. Moreover, with an increasing traffic volume and vessel payload in some waterways, the bridge piers designed according to previous specifications might not be sufficient to resist the current vessel impact loads. Therefore, strengthening existing bridge piers are sometimes necessary for protecting structures from barge impact. Carbon fiber reinforced polymer (CFRP) has been widely used in strengthening reinforced concrete structures under impulsive loadings. It is an effective material which has been proven to be able to increase the flexural strength of structures. In this study, CFRP composites are used to strengthen reinforced concrete piers against barge impact loads. Pendulum impact tests are conducted on scaled pier models. Impact force and pier response with and without CFRP strengthening are compared. The effectiveness of using CFRP strengthening the pier model is observed. In addition, numerical models of the bridge piers are developed and calibrated with experimental results. Parametric simulations of barge impacting on piers with or without CFRP strengthening are carried out. The results show that compared with unstrengthened pier, CFRP composite strengthened bridge pier has a higher impact resistance capacity and hence endures less structural damage under the same barge impact load. The effectiveness of CFRP strengthening with different CFRP thickness, CFRP strength and bond strength between the pier and the CFRP composite are also discussed.

Assessing the response and fragility of concrete bridges under multi-hazard effect of vessel impact and corrosion

2020 ◽  
Vol 225 ◽  
pp. 111279
Author(s):  
Wei Fan ◽  
Yang Sun ◽  
Cancan Yang ◽  
Wenbiao Sun ◽  
Yang He
Keyword(s):  
Concrete Bridges ◽  
Vessel Impact

A Flat Cylinder Theory for Vessel Impact and Steady Planing Resistance

1996 ◽  
Vol 40 (02) ◽  
pp. 89-106 ◽  
Author(s):  
William S. Vorus
Keyword(s):  
Boundary Conditions ◽  
Asymptotic Methods ◽  
Time Integration ◽  
Hydrodynamic Theory ◽  
Exact Formulation ◽  
Flow Perturbation ◽  
Calm Water ◽  
Algebraic Formula ◽  
Numerical Time Integration ◽  
Vessel Impact

This work has been motivated by the need for an alternative hydrodynamic theory to apply in analysis of impact loads on typical sections of vessels operating in waves, as well as for the closely analogous hydrodynamics of steady planing in calm water. A theory is needed which is computationally practical, but also physically sound, and incorporating the needed level of sensitivity to detail in the driving physical variables. A new theory believed to achieve this objective is proposed herewith. It can be viewed as a rational compromise between direct numerical inversion of the relatively exact governing equations, which is not presently possible to the needed level of generality, and the simple asymptotic theories evolved from the original work of Herbert Wagner (1932). The single solution field of the exact formulation is retained in the proposed theory; this is versus separate near and far fields of the asymptotic methods. The major reduction of the exact equations exercised here is the specification of uniform first-order geometric linearity; this is also an implicit characteristic of the Wagner class of asymptotic theories. All boundary conditions are satisfied on the horizontal axis in the limit of flatness. But the proposed theory retains the hydrodynamic nonlinearity of the exact formulation; the transverse flow perturbation is retained in the axis boundary conditions to consistent order. As contour flatness is approached and geometric linearity is more and more closely achieved, the transverse contour velocity becomes increasingly larger. The achievement of uniform geometric linearity in the flatness limit is therefore accompanied by uniform hydrodynamic nonlinearity. This is not recognized in the asymptotic theories, where the far field is linear both geometrically and hydrodynamically. The reduction of the exact formulation to an axis satisfaction of the boundary conditions allows much of the geometric inversion imbedded within the initial value problem to be performed analytically. Thus the outer numerical time integration of the system is in terms of stable algebraic formula, resulting in algorithms that are reliably computable on standard computing equipment. Discretization of the general theory for numerical analysis is proposed. The analysis procedure developed is applied to a number of cases of generalized flat cylinder impact. This is in the interest of demonstrating both its utility and its value in providing new insight into the very complex character of impact hydrodynamics.

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