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.

Response of box-type structure and effect of structural parameters on reflected pressure under blast load

2019 ◽  
Vol 10 (3) ◽  
pp. 359-379
Author(s):  
Lekhani Gaur ◽  
Tanusree Chakraborty ◽  
Ashish K Darpe ◽  
Vasant Matsagar
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Structural Parameters ◽  
Structural Response ◽  
Blast Loading ◽  
Comparative Assessment ◽  
Type Structure ◽  
Blast Load ◽  
Angle Of Incidence ◽  
Element Analysis

The study presented herein includes finite element analysis of a box type structure subjected to blast loading using the coupled Eulerian-Lagrangian methodology to investigate the structural response. A comparative assessment of structural response observed from coupled Eulerian-Lagrangian and Unified Facility Criteria guidelines is presented. Furthermore, the effect of the structural parameters on reflected overpressure for different angle of incidence has been investigated and compared with that given in the Unified Facility Criteria. It is observed that the structural parameters significantly affect the reflected overpressure. The Unified Facility Criteria overestimates the response of structure in a certain region of angle of incidence while it underestimates the reflected pressure in the rest region of the angle of incidence.

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.

Developing the Structural Integrity Management System for Ageing Fixed Offshore Oil Platforms in Indonesia

2017 ◽  
Vol 862 ◽  
pp. 265-270
Author(s):  
Raditya Danu Riyanto ◽  
Murdjito
Keyword(s):  
Management System ◽  
Structural Integrity ◽  
Offshore Structures ◽  
Offshore Platforms ◽  
Offshore Structure ◽  
Element Analysis ◽  
East Kalimantan ◽  
Ranking Criteria ◽  
Life Years ◽  
Integrity Management

Offshore structure, particularly fixed offshore structures, should be kept in the performance for the fit-for-purpose condition during their operating lifetime. For fixed offshore structures that exceed their designated life years, the proper Structural Integrity Management System (SIMS) should be developed and applied. Despite the fixed offshore platforms have their service life, there are still platforms that continue to operate exceeding their service lifetime. These ageing platforms should be taken care thoroughly to avoid the consequences that could take casualties. This paper will propose the proper initiation of SIMS development for ageing fixed offshore platforms in Indonesia, by taking an example at Bekapai Field Platforms in East Kalimantan. Using HAZID technique and several ranking criteria, the platforms are assessed and ranked. Platforms that categorized in critical condition are grouped based on similarities in geometry and function. The highest rank is analyzed in computer Finite Element Analysis (FEA) Software with modification based on latest inspection result. This method is proven to be a proper method to be used as a maintenance program for ageing fixed offshore platforms in Indonesia.

Improvement of strength and toughness: The effect on the weldability of high-strength steels used in offshore structures

2016 ◽  
Vol 231 (3) ◽  
pp. 369-376 ◽  
Author(s):  
Sammy-Armstrong Atta-Agyemang ◽  
Martin Appiah Kesse ◽  
Paul Kah ◽  
Jukka Martikainen
Keyword(s):  
Impact Toughness ◽  
High Strength Steels ◽  
High Strength ◽  
Offshore Structures ◽  
Controlled Rolling ◽  
Accelerated Cooling ◽  
Offshore Platforms ◽  
Zone Structure ◽  
Controlled Processing ◽  
Strength And Toughness

The effect of strength and toughness on the weldability of high-strength steels is very vital consideration in the offshore oil and gas industries. Improved impact toughness of high-strength steels in offshore structures enables viable exploitation of hydrocarbons in technologically challenging conditions. This article reviews improvements in the weldability and impact toughness of high-strength steels. Steels with high strength are associated with high carbon content and addition of alloying elements as they induce hardness which leads to a higher risk of brittle fracture and hydrogen-induced cracking needs. The combination of high strength with high toughness was studied by examining the toughening mechanism of thermomechanical-controlled processing steels, which have higher strength than conventional steel plates but meet the conflicting requirements of strength, toughness and weldability. The thermomechanical-controlled processing production process entails controlled rolling process combined with accelerated cooling or direct quenching to ensure stable mechanical properties of thermomechanical-controlled processing products in welded constructions. It is concluded that due to their very fine grain size and refined heat-affected zone structure, thermomechanical-controlled processing steels can be an effective cost-saving means for fabrication of offshore structures, particularly in shipbuilding, offshore platforms and pipelines for high-operating pressures.

A Study on Dynamic Behavior of Offshore Structures Under the Blast Load

2011 ◽  
Author(s):  
Kun-Hee Lee ◽  
Ki Young Yoon
Keyword(s):  
Nonlinear Dynamic ◽  
Oil And Gas ◽  
Nonlinear Dynamic Analysis ◽  
Structural Response ◽  
Offshore Structures ◽  
Blast Load ◽  
Economic Approach ◽  
Offshore Structure ◽  
Oil And Gas Development ◽  
High Possibility

Safety verification against blast load is important in offshore structure for oil and gas development which have the high possibility of explosion accident. The structural response against blast is a nonlinear dynamic phenomenon, it is necessary the nonlinear dynamic analysis for accurate structural behavior. But it requires much more computing resource and manpower than conventional linear analysis. Therefore, simple approaches such as modified code check and Biggs’ simplified SDOF have been widely used for the structural verification. These approaches are very useful in design for simplicity and conservativeness. However, they don’t represent proper dynamic characteristics, thus sometimes they may cause excessively conservative. In this paper, the dynamic characteristic of structures beyond the yield point is studied by using nonlinear dynamic FE analysis and more safe and economic approach is suggested.

scholarly journals GBT-Based Structural Analysis of Elastic-Plastic Thin-Walled Members

2019 ◽  
Author(s):  
Miguel Abambres ◽  
Dinar Camotim ◽  
Nuno Silvestre
Keyword(s):  
Finite Element ◽  
Structural Response ◽  
Beam Theory ◽  
High Strength ◽  
Elastic Plastic ◽  
Collapse Mechanisms ◽  
Non Linear ◽  
Steel Grades ◽  
Thin Walled ◽  
Shell Finite Element

Structural systems made of high-strength and/or high-ductility metals are usually also rather slender, which means that their structural behavior and ultimate strength are often governed by a combination of plasticity and instability effects. Currently, the rigorous numerical analysis of such systems can only be achieved by resorting to complex and computationally costly shell finite element simulations. This work aims at supplying to designers/researchers an efficient and structurally clarifying alternative to assess the geometrically and/or materially non-linear behavior (up to and beyond the ultimate load) of prismatic thin-walled members, such as those built from cold-formed steel. The proposed approach is based on Generalized Beam Theory (GBT) and is suitable for members exhibiting arbitrary deformation patterns (e.g., global, local, distortional, shear) and made of non-linear isotropic materials (e.g., carbon/stainless steel grades or aluminum alloys). The paper begins by providing a critical overview of the physically and geometrically non-linear GBT formulation recently developed and validated by the authors (Abambres et al. 2012a), which is followed by the presentation and thorough discussion of several illustrative numerical results concerning the structural responses of 4 members (beams and columns) made of distinct (linear, bi-linear or highly non-linear) materials. The GBT results consist of equilibrium paths, modal participation diagrams and amplitude functions, stress contours, displacement profiles and collapse mechanisms some of them are compared with values obtained from ABAQUS shell finite element analyses. It is shown that the GBT modal nature makes it possible (i) to acquire in-depth knowledge on the member behavioral mechanics at any given equilibrium state (elastic or elastic-plastic), as well as (ii) to provide evidence of the GBT computational efficiency, which is achieved by excluding from the analyses all the deformation modes that do not play any role in a particular member structural response.

scholarly journals Structural Performance Evaluation for Vibration-based Energy Harvester utilized in Railway Vehicle

2018 ◽  
Vol 167 ◽  
pp. 02003
Author(s):  
Ki-Weon Kang ◽  
Ji-Won Jin
Keyword(s):  
Performance Test ◽  
Energy Harvester ◽  
Structural Integrity ◽  
Structural Response ◽  
Structural Performance ◽  
Railway Vehicle ◽  
Response Analysis ◽  
Frequency Response Analysis ◽  
Element Analysis ◽  
Vibration Energy Harvester

This study aims to assess the structural performance and structural integrity of vibration energy harvester (VEH). For this, the structural performance test were conducted to identify the natural frequency and structural response against frequency. And then, static structural analysis was performed using finite element analysis to investigate the failure critical locations (FCLs). Finally, we conducted the frequency response analysis in frequency domain to obtain the structural response with frequency and investigate the structural integrity of VEH. Using the above results, we assessed the structural performance and structural integrity of two types of VEHs.

scholarly journals Structural Response Of A Slotted Bridge Pier Under Blast Loading Using Finite Element Analysis

2021 ◽  
Vol 12 (4) ◽  
pp. 413-422
Author(s):  
Kuldeep R.Patel, Et. al.
Keyword(s):  
Structural Response ◽  
Blast Loading ◽  
Bridge Pier ◽  
The Other ◽  
Design Criteria ◽  
Marine Structures ◽  
Element Analysis ◽  
Load Response ◽  
Crucial Part ◽  
Abaqus Software

Bridge pier is a crucial part for the transportation in marine structures. Scouring is a major cause for the failure of the pier. slot among the other countermeasures increases the efficiency of scour reduction and minimizes the failure due to scour.as we provide the slot; the strength of the pier reduces compared to the conventional pier. change in reinforcement pattern in slotted bridge pier changes the behavior of the pier under similar loading conditions. blast occurrence has increased in recent times and rehabilitation of a structure and improvement of strength against explosion is necessary in structure. this paper studies the behavior of slotted bridge pier under blast loading and compares theoretical and analytical aspects for the same. Design criteria for blast load according to NCHRP 12-72 are followed to carry out theoretical load response of the pier under blast loading. Analytically the behavior of pier is checked using coupled eulerian lagrangian approach using ABAQUS software. a detailed eulerian domain and slotted pier with reinforcement is assembled in ABAQUS to analyze the behavior of pier under explosion using TNT of 100kg at a scaled distance of 4ft for the period of 0.02seconds. this design gave better result in terms of mitigating effects of blast on slotted bridge pier.

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.

scholarly journals Evaluation of Structural Performance of Concrete Beams Strengthened with Carbon Fiber Sheets and No-Slump Concrete

2020 ◽  
Vol 20 (4) ◽  
pp. 185-193
Author(s):  
Sunjae Yoo ◽  
Tianfeng Yuan ◽  
Sehee Hong ◽  
Youngsoo Yoon
Keyword(s):  
Energy Dissipation ◽  
Carbon Fiber ◽  
Structural Response ◽  
High Strength ◽  
Maximum Load ◽  
Load Resistance ◽  
High Energy ◽  
Structural Performance ◽  
Lower Load ◽  
Fiber Sheet

In this study, the compression and tensile sections of existing concrete were reinforced using carbon fiber sheet (CFS) and no-slump high-strength, ductility concrete (NSHSDC) to evaluate the structural response of the reinforced concrete. From the experimental test results, the CFS showed a low energy dissipation ability when reinforced at both the compression and tensile sections. However, the NSHSDC reinforcement exhibited high energy dissipation and the lowest deflection under maximum load at both the compression and tension sections. The NSHSDC without reinforcement in the compression section, and concrete reinforced with CFS, exhibited lower load resistance and concrete compression failure. Furthermore, a linear relationship between the compression reinforcement and structural performance was observed, which demonstrated the high load resistance and excellent structural performance of the member reinforced with NSHSDC at both the compressive and tensile sections.

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