Nonlinear Structural Consequence Analysis of Blast Wall Structures Under Hydrocarbon Explosive Loads

2012 ◽  
Author(s):  
Jung Min Sohn ◽  
Byoung Hoon Kim ◽  
Jeom Kee Paik ◽  
Graham Schleyer
Keyword(s):  
Risk Assessment ◽  
Finite Element ◽  
Structural Response ◽  
Offshore Structures ◽  
Response Analysis ◽  
Offshore Platforms ◽  
Element Analysis ◽  
Practical Procedure ◽  
Nonlinear Structural ◽  
Wall Structures

Many accidents that occur on offshore structures, especially explosions, are extremely hazardous. Violent explosions can have serious consequences for health, safety, and the marine environment. The topsides of offshore platforms are the most likely areas to be exposed to hazards such as hydrocarbon explosions. Therefore, profiled barriers are being increasingly used as blast walls in offshore topsides modules to provide a safety barrier for personnel and critical equipment. The aim of this study is to develop a practical procedure for the nonlinear structural response analysis of corrugated blast walls under explosion. Within the framework of quantified risk assessment and management of offshore installations, more refined computations are required to assess the consequences or hazardous action effects of explosions. In addition, appropriate guidance will be presented on the use of the finite element numerical tool for the above purpose. The structural response has been computed using commercial nonlinear finite element analysis (NLFEA) code and the results compared with the single degree of freedom (SDOF) method. The relationships between blast pressure and the impulse of corrugated blast walls are developed. This study’s insights into modeling techniques and procedures will be applicable to the explosion risk assessment of offshore structures.

Nonlinear Structural Consequence Analysis of FPSO Topsides Under Fire

2012 ◽  
Author(s):  
Jeong Hwan Kim ◽  
Du Chan Kim ◽  
Cheol Kwan Kim ◽  
Md. Shafiqul Islam ◽  
Jeom Kee Paik
Keyword(s):  
Structural Response ◽  
Fire Risk ◽  
Offshore Structures ◽  
Nonlinear Material ◽  
Response Analysis ◽  
Element Analysis ◽  
Practical Procedure ◽  
Consequence Analysis ◽  
Nonlinear Structural ◽  
Structural Consequence

This study aims to develop a practical procedure for the nonlinear structural consequence analysis of structures under fire. The thermal and structural response analysis have been performed in this study using a commercial nonlinear Finite Element Analysis (FEA) code. The results of the structural response analysis are then compared to the experimental results. This study concludes by presenting methods for fire load applications and nonlinear material modeling. The insights offered by the modeling techniques and analysis procedures presented in this study should be very useful and practical in the fire risk assessment of offshore structures.

Finite Element Analysis of Unbonded Prestressed Concrete Silos

2014 ◽  
Vol 578-579 ◽  
pp. 60-65
Author(s):  
Guang Shu Xu ◽  
Huan Qin Liu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Prestressed Concrete ◽  
Seismic Analysis ◽  
Structural Response ◽  
Response Analysis ◽  
Element Analysis ◽  
Paper Making ◽  
Pile Caps ◽  
Prestressed Reinforcement

in this paper, making coal storage silo that diameter is a 120 m as the background, researched warehouse wall and pile caps using finite element method. In articles, the finite element analysis of soil, study the influence of prestressed reinforcement about prestressed effect, the structural response analysis under different stack forms and seismic analysis. The results show that: inside and outside temperature difference makes maximum stress, full load can reflect the other coal pile forms, the ability of resist the earthquake is strong.

Optimization of the Structural Performance for Corrugated Blast Panels on Offshore Platforms

2018 ◽  
Author(s):  
John Vande Voorde ◽  
Filip Van den Abeele ◽  
Steven Cooreman
Keyword(s):  
Structural Response ◽  
Blast Loading ◽  
High Strength ◽  
Offshore Structures ◽  
Blast Load ◽  
Structural Performance ◽  
Offshore Platforms ◽  
Element Analysis ◽  
Load Profile ◽  
Steel Grades

Blast panels are integral structures in offshore topside modules to protect personnel and safety critical equipment by preventing the escalation of events due to hydrocarbon explosions. As such, blast panels are expected to retain their integrity against any blast loading and subsequent hydrocarbon fire. Most of the blast panels currently installed in offshore structures have been designed using simplified calculation approaches such as the Single Degree of Freedom (SDOF) models, as recommended by offshore design codes and industry recommended practices. In this paper, the Non-Linear Finite Element Analysis (NLFEA) technique is used to simulate the structural response of corrugated panels subjected to blast loading. Detailed numerical analyses allow identifying the limits of the SDOF approach, and exploring different design options to optimize the structural response of corrugated blast panels. The blast load profile corresponding to an explosion is one of the most important factors to consider in the structural analysis. The mechanism of hydrocarbon explosions is very complex, and the corresponding blast load profile intimately depends on the type of explosion, the congestion and the structural confinement. A sensitivity analysis is performed to investigate the influence of the blast pulse shape, and in particular to evaluate the effect of the maximum peak pressure and the exposure time. To explore the benefits of introducing higher strength steels in demanding offshore applications, pressure-impulse diagrams have been derived for different high strength steel grades. In our analysis, (ultra)high strength cut-to-length plates from hot rolled coil are proposed to optimize the design of the blast panel whilst preserving the structural performance under demanding load conditions.

Structural Analysis of Various Stool Configurations on FPSO Topsides Modules

2014 ◽  
Author(s):  
Amy Marie Zahray ◽  
David Sandor Smith
Keyword(s):  
Finite Element ◽  
Structural Response ◽  
Fatigue Loading ◽  
Offshore Structures ◽  
Strength Analysis ◽  
Fe Model ◽  
Element Analysis ◽  
Modern Approach ◽  
Modeling And Analysis ◽  
Hull Girder

This thesis investigates some of the structural issues associated with the conversion of an oil tanker or a very large crude carrier (VLCC) into a floating production, storage, and offloading unit (FPSO). Specifically, a series of calculations were completed, including Finite Element Analysis (FEA), to evaluate the structural response of the stood interface of the topside module, resulting from its interaction with the FPSO’s hull girder in waves. The interfaces between topside modules and the hulls of converted tankers experience high fatigue loading. This loading, which is caused primarily by hull girder bending elongation in addition to inertia loading on the topside modules, creates a structural design challenge. A modern approach to solving a problem of such complexity requires the generation of a finite element (FE)model of the topside module, the stool interface, and the structure located immediately below the interface. The objective of this thesis was to determine a stool arrangement that performs the best in fatigue, while also meeting all class requirements for maximum allowable stress. The modeling and analysis of the so-called deck sub-model was carried out using the FEA program Sesam GeniE. GeniE is a program developed by Det Norske Veritas (DNV)Software that sees wide use in the industry for engineering and strength analysis of ships and offshore structures. The loading of the model represents the dynamic loads experienced by an actual FPSO concept or design. The FPSO concept was provided by an industry professional at Viking Systems, Lars Henriksen. A total of six different stool configurations were investigated in this thesis. Variables of consideration were: flexibility of connection points, sliding and welded connections, and number and placement of stools. In addition, the producibility challenges related to the stool design selection and integration, which is expected to impact the conversion cost.

The Finite Element Analysis and Optimization for the Grinder Based on the Joint Surface

2013 ◽  
Vol 281 ◽  
pp. 165-169 ◽  
Author(s):  
Xiang Lei Zhang ◽  
Bin Yao ◽  
Wen Chang Zhao ◽  
Ou Yang Kun ◽  
Bo Shi Yao
Keyword(s):  
Finite Element ◽  
Natural Frequency ◽  
Element Model ◽  
Joint Surface ◽  
Weak Links ◽  
Response Analysis ◽  
Element Analysis ◽  
Static And Dynamic Analysis ◽  
Harmonic Response Analysis ◽  
Grinding Machine

Establish the finite element model for high precision grinding machine which takes joint surface into consideration and then carrys out the static and dynamic analysis of the grinder. After the static analysis, modal analysis and harmonic response analysis, the displacement deformation, stress, natural frequency and vibration mode could be found, which also helps find the weak links out. The improvement scheme which aims to increase the stiffness and precision of the whole machine has proposed to efficiently optimize the grinder. And the first natural frequency of the optimized grinder has increased by 68.19%.

Creative Design-by-Analysis Solutions Applied to High-Temperature Components

1993 ◽  
Vol 115 (3) ◽  
pp. 221-227
Author(s):  
A. K. Dhalla
Keyword(s):  
Finite Element ◽  
High Temperature ◽  
Detailed Analysis ◽  
Structural Response ◽  
Cost Effective ◽  
Element Analysis ◽  
Finite Element Software ◽  
Division 1 ◽  
High Temperature Components ◽  
Elevated Temperature Design

Elevated temperature design has evolved over the last two decades from design-by-formula philosophy of the ASME Boiler and Pressure Vessel Code, Sections I and VIII (Division 1), to the design-by-analysis philosophy of Section III, Code Case N-47. The benefits of design-by-analysis procedures, which were developed under a US-DOE-sponsored high-temperature structural design (HTSD) program, are illustrated in the paper through five design examples taken from two U.S. liquid metal reactor (LMR) plants. Emphasis in the paper is placed upon the use of a detailed, nonlinear finite element analysis method to understand the structural response and to suggest design optimization so as to comply with Code Case N-47 criteria. A detailed analysis is cost-effective, if selectively used, to qualify an LMR component for service when long-lead-time structural forgings, procured based upon simplified preliminary analysis, do not meet the design criteria, or the operational loads are increased after the components have been fabricated. In the future, the overall costs of a detailed analysis will be reduced even further with the availability of finite element software used on workstations or PCs.

The Finite Element Analysis of Dynamic Interaction of High-Speed Shinkansen, the Rail, and Bridge

1993 ◽  
Author(s):  
Makoto Tanabe ◽  
Hajime Wakui ◽  
Nobuyuki Matsumoto
Keyword(s):  
Finite Element ◽  
Dynamic Response ◽  
High Speed ◽  
Response Analysis ◽  
Element Formulation ◽  
Element Analysis ◽  
Finite Element Program ◽  
The Finite Element Analysis ◽  
Element Program ◽  
The Impact

Abstract A finite element formulation to solve the dynamic behavior of high-speed Shinkansen cars, rail, and bridge is given. A mechanical model to express the interaction between wheel and rail is described, in which the impact of the rail on the flange of wheel is also considered. The bridge is modeled by using various finite elements such as shell, beam, solid, spring, and mass. The equations of motions of bridge and Shinkansen cars are solved under the constitutive and constraint equations to express the interaction between rail and wheel. Numerical method based on a modal transformation to get the dynamic response effectively is discussed. A finite element program for the dynamic response analysis of Shinkansen cars, rail, and bridge at the high-speed running has been developed. Numerical examples are also demonstrated.

Probabilistic Finite-Element Analysis of Airfield Pavements

1996 ◽  
Vol 1540 (1) ◽  
pp. 29-38 ◽  
Author(s):  
Yuan Jie Lua ◽  
Robert H. Sues
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Spatial Variability ◽  
Life Prediction ◽  
Homogeneous Layer ◽  
Response Analysis ◽  
Element Analysis ◽  
Analysis And Design ◽  
Pavement Structures ◽  
Element Method

Mechanistic pavement analysis and design based on either layered elastic analysis (LEA) or the finite element method (FEM) is increasingly being used to replace the empirical design process. The simplifying assumptions of a uniform, homogeneous layer of linear material used in LEA can render its analysis inaccurate for real pavement structures. The FEM is more attractive for structural analysis of pavements; the generality of the FEM also allows both the use of comprehensive material models and modeling of the spatial variability that exists in pavement systems. To date, spatial variability and uncertainty are ignored in pavement system finite element analyses. Ignoring spatial variability and uncertainty implies a false sense of accuracy in the results and can lead to inaccurate assessment of the pavement. The first application of the probabilistic finite element method to pavement response analysis and life prediction and the first investigation of the effects of spatial variability on pavement life prediction are presented. It is concluded that the probabilistic FEA, with spatial variability, is a more accurate representation of the true physical condition and leads to results that are less conservative than those obtained with probabilistic LEA.

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