Socio-economically sustainable civil engineering infrastructures by optimization

Rackwitz, R.; Lentz, A; Faber, Michael Havbro

doi:10.1016/j.strusafe.2004.10.002

Cited by 105 publications

(46 citation statements)

References 33 publications

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“…The calculation of the limit state dependent cost C LS is based on the assumption that after the occurrence of an earthquake the structure is fully restored to its initial state. In this work the annual momentary discount rate λ is considered to be constant, since considering a continuous discount rate is accurate enough for all practical purposes according to Rackwitz (Rackwitz et al 2005;Rackwitz 2006). The discount rate λ is considered to be equal to 6%, which is a representative value for Greece.…”

Section: Initial and Limit State Dependent Costmentioning

confidence: 99%

“…Among others, Liu et al (2005) proposed a multiobjective structural optimization formulation where the present capital investment and the future seismic risk are treated simultaneously as separate objectives. In the work by Rackwitz et al (2005) an appropriate objective function for cost-benefit analyses based on a renewal model is established while various renewal models for deteriorating structures including multiple failure modes are examined. In the work by Wen and Kang (2001a,b) building design criteria are developed to protect life and to reduce damage and loss to an acceptable level for this purpose a minimization problem of the total life-cycle cost is considered.…”

mentioning

confidence: 99%

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Life-cycle cost analysis of design practices for RC framed structures

Lagaros

2007

Bull Earthquake Eng

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The objective of this study is to perform life-cycle cost analysis on three design practices namely weak ground storey, short and floating columns and their combinations. Life-cycle cost analysis is recognized as the only suitable tool for assessing the structural performance when the structure is expected to be functional for a long period of time. Lifecycle cost analysis is considered in this study assessing the behaviour of the three design practices against earthquake hazard. Although, a number of checks are performed in order to reduce the influence of these design practices on the seismic behaviour of reinforced concrete (RC) framed structures, it was found that the total life-cycle cost of partially infilled RC designs is significantly increased compared to that of the fully infilled one. Through the test example examined in the framework of this study general conclusions are obtained regarding the behaviour of the three design practices.

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Section: Initial and Limit State Dependent Costmentioning

confidence: 99%

mentioning

confidence: 99%

Life-cycle cost analysis of design practices for RC framed structures

Lagaros

2007

Bull Earthquake Eng

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“…In some risk assessments it is seen that loss of lives are accounted for in risk based cost-benefit evaluations by associating lost lives with monetary values representing the societal value of a life, assessed on very different bases. Recent research has, however, pointed to the perspective that this need not be done at all [9]; the issue being, that such conversions are only relevant in situations where compensations are to be paid. The compensations are generally regulated by the practice of law [1].…”

Section: On the Assessment Of Consequencesmentioning

confidence: 99%

FPSO Risk Assessment and Acceptance Criteria With Application to FPSO Mooring Systems

Faber

Straub²,

Montes-Iturrizaga

et al. 2009

Volume 2: Structures, Safety and Reliability

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Risk based design code safety format calibration for FPSO installations is addressed based on the results of a recent industrial project performed for IMP by the authors. Generic risk models for general engineering systems are introduced taking basis in recent work by the Joint Committee on Structural Safety (JCSS). Thereafter, the scenarios considered for the risk based calibration of a design code safety format for the design of FPSO facilities in the Gulf of Mexico are outlined in some detail. Furthermore, it is shown how these scenarios may be represented in a generic risk assessment model greatly enhanced by the utilization of hierarchical risk modeling procedures such as Bayesian Probabilistic Nets (BPN’s). A short outline of the Life Quality Index (LQI) principle is then introduced as a practically applicable means to determine how much should be invested into life saving activities. Finally, an example is given where the introduced concepts are used for the purpose of determining the target reliability index for individual mooring lines taking into account the direct and indirect consequences of failure of the mooring system for a considered generic FPSO installation.

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“…A questão da desvalorização monetária com o tempo é abordada, por exemplo, em Rackwitz et al (2005), no qual se afirma que o modelo contínuo de desvalorização monetária é suficientemente preciso para todos os fins práticos. Nesse modelo, considerando uma taxa de desvalorização monetária constante, λ c , o custo no tempo inicial, C(0), equivalente a um dado custo no tempo t, C(t), é determinado pela seguinte Equação:…”

Section: Vidaunclassified

“…Artigos conceituais têm discutido a otimização de inspeções e manutenções com base em mecanismos gerais de degradação e envolvendo vários tipos de estruturas civis (Onoufriou & Frangopol, 2002;Rackwitz et al, 2005;Straub & Faber, 2005;Bucher & Frangopol, 2006;Streicher et al, 2008;Okasha & Frangopol, 2009;Sanchez-Silva et al, 2011).…”

Section: Otimização De Um Duto Enterrado Sujeito à Corrosãounclassified

Otimização de riscos sob processos aleatórios de corrosão e fadiga

Gomes¹

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A versão original encontra-se na Escola de Engenharia de São Carlos São Carlos 2013Dedico este trabalho a Deus e à minha família. AGRADECIMENTOSA Deus, pelas oportunidades que a vida me trouxe.Ao professor André Beck, orientador do presente trabalho, por tudo que me ensinou, por tudo que tentou me ensinar, pela paciência e disponibilidade. Pelas reuniões semanais que muitas vezes se tornaram diárias. Processos aleatórios de corrosão e fadiga reduzem lentamente a resistência de estruturas e componentes estruturais, provocando um aumento gradual nas probabilidades de falha. A gestão do risco de falha de componentes sujeitos a corrosão e/ou fadiga é feita através de políticas de inspeção, manutenção e substituição, atividades que implicam em custos, mas visam manter a confiabilidade em níveis aceitáveis, enquanto o componente permanecer em operação. Aparentemente, os objetivos economia e segurança competem entre si, no entanto, a redução de recursos para inspeção e manutenção pode levar a maiores e crescentes probabilidades de falha, implicando em maiores custos esperados de falha, ou seja, maior risco. A otimização de risco estrutural é uma formulação que permite equacionar este problema, através do chamado custo esperado total. Nesta Tese, a otimização de risco é utilizada no intuito de encontrar políticas ótimas de inspeção e manutenção, isto é, quantidades de recursos a serem alocadas nestas atividades que levem ao menor custo esperado total possível. Os processos de corrosão e fadiga são representados através de modelos em polinômios de caos, construídos de maneira inédita, com base em dados experimentais ou observados da literatura. Com base nestes modelos, os problemas de otimização de risco envolvendo processos de fadiga e corrosão são resolvidos para diferentes configurações de custos de falha e de inspeções. Verifica-se que as políticas ótimas de inspeção, manutenção e substituição podem ser bastante diferentes para configurações de custo distintas, e que a determinação destas políticas é bastante desafiadora, devido, dentre outros fatores, à grande quantidade de mínimos locais do problema de otimização em questão, causadas por descontinuidades e oscilações da função custo esperado total. Random corrosion and fatigue processes reduce slowly but gradually the resistance of structures and mechanical components, leading to gradual increase in failure probabilities.Risk management for mechanical components subject to corrosion and fatigue is made by means of policies of inspection, maintenance and substitution. These activities imply costs, but are made to maintain the reliability at acceptable levels, while the component remains in operation. Apparently, economy and safety are competing objectives; however, reduction in inspection and maintenance spending may lead to larger failure probabilities, increasing expected costs of failure (risk). Risk optimization allows one to solve this problem, by means of the so-called total expected cost. In this Thesis, risk optimization is used in order to find the best ins...

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Socio-economically sustainable civil engineering infrastructures by optimization

Cited by 105 publications

References 33 publications

Life-cycle cost analysis of design practices for RC framed structures

Life-cycle cost analysis of design practices for RC framed structures

FPSO Risk Assessment and Acceptance Criteria With Application to FPSO Mooring Systems

Otimização de riscos sob processos aleatórios de corrosão e fadiga

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