Structural Safety Analyses for Offshore Platforms Under Explosion Loadings

2019 ◽  
Vol 141 (4) ◽  
Author(s):  
Yonghee Ryu ◽  
Bassam Burgan ◽  
Jaewoong Choi ◽  
Heesung Lee
Keyword(s):  
Structural Response ◽  
Time History ◽  
Structural Safety ◽  
Offshore Platforms ◽  
Structural Elements ◽  
Gas Explosion ◽  
Lagrangian Analysis ◽  
Safety Critical ◽  
Compression Waves ◽  
Explosion Risk

A gas explosion in an offshore platform may result in loss of life, pollution, and critical damage to facilities. Safety critical structural elements of these facilities have to be designed to withstand high explosion loads. The present study discusses methodologies for explosion risk assessment (ERA) of safety critical structural elements and introduces a coupled Eulerian–Lagrangian (CEL) method to improve the accuracy of the dynamic structural response under explosion loading. The design accidental load is defined by explosion risk analyses in terms of drag pressure, differential pressure, and overpressure. In current practice, an explosion pressure-time history is simplified into a triangular shape and uniformly applied to the surface of the impacted structures. This approach cannot account for the interaction between elastic waves (normally solved by the Lagrangian method) in the structure and compression waves (normally solved by the Eulerian method) in air. The CEL method which accounts for fluid–structure interaction has been experimentally validated and leads to more realistic predictions of the dynamic response of structures when compared to other analysis methods. The plastic strains derived from the CEL analysis can be approximately 50% lower than those predicted by Lagrangian analysis. Therefore, significant potential weight reduction can be achieved using the CEL method for gas explosion analysis.

scholarly journals A Study on a Quantitative Analysis Method for Fire and Explosion Risk Assessment of Offshore Platforms

2020 ◽  
Vol 2020 ◽  
pp. 1-20
Author(s):  
Zhaohui Shang ◽  
Huibin Yan ◽  
Weidong Ruan ◽  
Yong Bai
Keyword(s):  
Risk Assessment ◽  
Oil And Gas ◽  
Latin Hypercube Sampling ◽  
Assessment Method ◽  
Dispersion Analysis ◽  
Offshore Platform ◽  
Exceedance Probability ◽  
Offshore Platforms ◽  
Gas Explosion ◽  
Explosion Risk

Proper design of the explosion loads is of vital importance in the risk assessment of explosions for offshore oil and gas installations. A quantitative assessment method for gas explosion loads in process modules of offshore platform is proposed in this paper. The proposed approach achieves the following three objectives: (a) defining a suitable number of leak scenarios quantitatively based on the Latin Hypercube Sampling (LHS) technique and statistical analysis; (b) defining the explosion scenarios according to the computational fluid dynamics (CFD) dispersion analysis results in the sampled leak scenarios; (c) designing the explosion loads on interested areas according to the CFD analysis results in different explosion scenarios and exceedance probability methods. The proposed method was applied to a process module of an example offshore platform. The pressure loads on interested areas of the example platform are very close to that suggested in Det Norske Veritas (DNV) codes. The method developed in this paper can benefit the engineers on better assessment of gas explosion risk in process modules for offshore installations.

Influence of the distribution of the shear walls on the seismic response of the buildings

2020 ◽  
Vol 15 (1) ◽  
pp. 37-44
Author(s):  
El Mehdi Echebba ◽  
Hasnae Boubel ◽  
Oumnia Elmrabet ◽  
Mohamed Rougui
Keyword(s):  
Structural Analysis ◽  
Seismic Response ◽  
Natural Frequency ◽  
Structural Design ◽  
Structural Response ◽  
Shear Walls ◽  
Structural Elements ◽  
Analysis Software ◽  
Ansys Apdl ◽  
The Impact

Abstract In this paper, an evaluation was tried for the impact of structural design on structural response. Several situations are foreseen as the possibilities of changing the distribution of the structural elements (sails, columns, etc.), the width of the structure and the number of floors indicates the adapted type of bracing for a given structure by referring only to its Geometric dimensions. This was done by studying the effect of the technical design of the building on the natural frequency of the structure with the study of the influence of the distribution of the structural elements on the seismic response of the building, taking into account of the requirements of the Moroccan earthquake regulations 2000/2011 and using the ANSYS APDL and Robot Structural Analysis software.

Application of Earthquake Resistance Analysis Technique in the Design of Constructional Engineering

2013 ◽  
Vol 756-759 ◽  
pp. 4482-4486
Author(s):  
Chun Gan ◽  
Xue Song Luo
Keyword(s):  
Response Spectrum ◽  
Structural Response ◽  
Time History ◽  
Economic Losses ◽  
Element Analysis ◽  
Architectural Engineering ◽  
Analysis Technique ◽  
History Analysis ◽  
Earthquake Resistant ◽  
History Of

In recent years, frequent earthquakes have caused great casualties and economic losses in China. And in the earthquake, damage of buildings and the collapse is the main reason causing casualties. Therefore, in the design of constructional engineering, a seismicity of architectural structure is the pressing task at issue. Through time history analysis method, this paper analyzes the time history of building structural response and then it predicts the peak response of mode by response spectrum analysis. Based on this, this paper constructs a numerical simulation model for the architecture by using finite element analysis software SATWE. At the same time, this paper also calculates the structure seismic so as to determine the design of each function structure in architectural engineering design and then provides reference for the realization of earthquake-resistant building.

scholarly journals The effect of seismic base isolation on structural response of a 12-story hotel building in Padang, Indonesia

2020 ◽  
Vol 156 ◽  
pp. 05026
Author(s):  
Fauzan ◽  
Afdhalul Ihsan ◽  
Mutia Putri Monika ◽  
Zev Al Jauhari
Keyword(s):  
Base Isolation ◽  
Response Spectrum ◽  
Soft Soil ◽  
Structural Response ◽  
Time History ◽  
Seismic Zone ◽  
Isolation System ◽  
Rubber Bearing ◽  
Seismic Base Isolation ◽  
The City

The amount of potential investment in Padang City, Indonesia since 2017 attracted many investors to contribute to the city. One of the investments is a 12-story hotel that will be constructed in By Pass Street of the city. The hotel is located in a high seismic zone area, so the seismic base isolation has been proposed to be used in the hotel building. The main aim of using a seismic base isolation device is to reduce the inertia forces introduced in the structure due to earthquakes by shifting the fundamental period of the structure out of dangerous resonance range and concentration of the deformation demand at the isolation system. An analytical study on the Reinforced Concrete (RC) hotel building with and without rubber bearing (RB) base isolation is carried out using the response spectrum and time history analysis methods. The results show that internal forces and inter-story drift of the building with high damping rubber bearing (HDRB) are lower than that of the fixed base with a remarkable margin. From this study, it is recommended to use the HDRB base isolation for medium and high rise buildings with soft soil in Padang City, Indonesia.

Explosibility Safety Factor: An Approach to Assess Mine Gas Explosion Risk

2013 ◽  
Vol 51 (2) ◽  
pp. 309-323 ◽  
Author(s):  
Jianwei Cheng ◽  
Yi Luo ◽  
Fubao Zhou
Keyword(s):  
Safety Factor ◽  
Gas Explosion ◽  
Mine Gas ◽  
Explosion Risk

Toward Limit State Design of Ships and Offshore Structures Under Impact Pressure Actions: A State-of-the-Art Review

2006 ◽  
Vol 43 (03) ◽  
pp. 135-145
Author(s):  
Jeom Kee Paik
Keyword(s):  
Limit State ◽  
Structural Response ◽  
Time History ◽  
Rate Sensitivity ◽  
Offshore Structures ◽  
Impact Pressure ◽  
Green Water ◽  
Limit State Design ◽  
Structural Capacity ◽  
Pressure Time

In design of ships and ship-shaped offshore units, issues related to impact pressure actions arising from sloshing, slamming, green water, or explosion are of particular concern. The structural response under impact pressure actions is quite different from that under static or quasistatic actions. It has been recognized that the limit state approach is a more rational basis for structural design and safety assessment where both "demand" (loads) and "capacity" (strength) must be accurately defined. For impact pressure action cases, the demand is associated with hydrodynamics areas, taking into account the characteristics of impact pressure-time history, and the structural capacity is associated with structural mechanics areas, considering geometric and material nonlinearities together with strain rate sensitivity. This paper reviews recent advances and trends toward future limit state design of ships and offshore structures under impact pressure actions.

scholarly journals Hemp Cables, a Sustainable Alternative to Harmonic Steel for Cable Nets

Resources ◽  
2018 ◽  
Vol 7 (4) ◽  
pp. 70 ◽  
Author(s):  
Alberto Viskovic
Keyword(s):  
Three Dimensional ◽  
Structural Response ◽  
Building Design ◽  
Structural Elements ◽  
Nonlinear Analyses ◽  
Hyperbolic Paraboloid ◽  
Materials Engineering ◽  
Recent Developments ◽  
Vertical Displacements ◽  
Cable Nets

Recent developments in the field of materials engineering have allowed for the use of natural materials for common structural elements, instead of traditional materials, such as steel or concrete. In this context, hemp is a very interesting material for structural building design. This paper proposes the use of hemp cables for roofs with hyperbolic paraboloid cable nets, which sees the use of a sustainable material for structure, thus having a very low environmental impact, in terms of structural thickness and amount of material. The paper discusses five different plan sizes and two different hyperbolic paraboloid surface radius of curvatures. The cable traction, which gives the cable net stiffness, was varied in order to give a parametric database of structural response. Three dimensional geometrically nonlinear analyses were carried out on different geometries (i.e., 10), cable net stiffnesses (i.e., 8), and materials (i.e., 2). Traditional harmonic steel and hemp cables are compared, in terms of vertical displacements and natural periods under dead and permanent loads.

scholarly journals Analysis of repair works to remove the effects of structural failure after a gas explosion

2019 ◽  
Vol 284 ◽  
pp. 02002
Author(s):  
Aleksandra Bąk ◽  
Ryszard Chmielewski
Keyword(s):  
Residential Buildings ◽  
Residential Building ◽  
Technical Condition ◽  
Structural Elements ◽  
Structural Failure ◽  
Gas Explosion ◽  
Gas Explosions ◽  
Construction Supervision ◽  
Bearing Structure ◽  
Construction Works

The article presents the issues of repair works in a multi-family residential building, whose structural and non – structural elements have been damaged and destroyed by a gas explosion and the fire. Gas explosions in residential buildings constitute a small percentage of the total number of building disasters, however, due to the relatively large number of injured people, these incidents are very dangerous [1]. Moreover, the gas explosion often leads to significant material losses and fatalities. Proper assessment of the load-bearing structure after such incident requires an extensive knowledge of the behaviour of structures. The first authority, that issues a decision regarding further use is Construction Supervision Inspector. Until the demolition of the object is ordered, the next step is to provide expert report made by an authorized construction expert, whose aim is to assess the technical condition of the elements of the structure and to determine the scope of necessary repair works. Construction expert, who give such opinion during the assessment of objects immediately after such incident, often has limited access to structural elements, moreover these elements often are covered. Hence, the recommendations contained in these reports often do not include all of required construction works.

Stochastic analysis of explosion risk for ultra-deep-water semi-submersible offshore platforms

2019 ◽  
Vol 172 ◽  
pp. 844-856 ◽  
Author(s):  
Jihao Shi ◽  
Yuan Zhu ◽  
Depeng Kong ◽  
Fasial Khan ◽  
Jingde Li ◽  
...  
Keyword(s):  
Deep Water ◽  
Stochastic Analysis ◽  
Offshore Platforms ◽  
Explosion Risk

New Industrial Energy and Resource Saving Structural Solutions for Public Buildings

2015 ◽  
Vol 725-726 ◽  
pp. 1423-1429 ◽  
Author(s):  
Natalia Klueva ◽  
Sergey Emelyanov ◽  
Vitaly Kolchunov ◽  
Anastasia Bukhtiyarova
Keyword(s):  
Structural Safety ◽  
Structural Elements ◽  
Public Buildings ◽  
Resource Saving ◽  
Feasibility Assessment ◽  
Floor Slabs ◽  
Industrial Energy ◽  
Predetermined Level ◽  
Structural Solutions ◽  
Experimental And Theoretical Studies

The paper presents new structural solutions for industrial energy and resource saving structures of public buildings with predetermined level of structural safety. The basis of the solutions is pre-cast (with cast-in-place concrete) bearing structures of internal longitudinal and transverse bearing walls of panel members, interconnected floor slabs and exterior self-bearing walls supported on straight or curved L-girders with thermal insulation holes The stiffness of a building with proposed solutions is provided by all structural elements connected in a special way. The authors also present some results of experimental and theoretical studies, pilot design projects, real construction and feasibility assessment of public buildings with proposed solutions.

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