Abstract:Design codes and standards rely on generalised target reliability indices. It is unclear, however, whether these indices are applicable to the specific risk-profile of marine structures. In this study, target reliability indices for quay walls were derived from various risk acceptance criteria, such as economic optimisation, individual risk (IR), societal risk (SR), the life quality index (LQI) and the social and environmental repercussion index (SERI). Important stochastic design variables in quay wall design… Show more
“…If the reliability of dikes is changing significantly in time, one also has to consider reinvestments. However, due to the dependence of slope stability reliability on time-independent ground-related uncertainty, slope stability of dikes (and other geotechnical structures, see e.g., Roubos et al (2018)) is typically rather time independent. Therefore, in an economic optimization one can estimate the annual target reliability by considering an infinite time horizon, such that the optimal level of protection b T , follows from the following minimization:…”
Section: Methodsmentioning
confidence: 99%
“…A reference period of 1 year is assumed, in line with common practice for flood defence structures. It should be noted that in some cases for geotechnical structures, the use of other reference periods might be more adequate (Roubos et al, 2018), and for instance the time factors provided in Diamantidis et al (2019) may be applied. The cost of the reference strategy without monitoring and proof loading is defined as c 0 : The Value of Information (VoI) of a strategy fp,m,dg can be computed by:…”
Section: Framework To Support Decision-making Towards Efficient Utilimentioning
confidence: 99%
“…Consequently the future failure probability might be overestimated in cases with large knowledge uncertainty, most notably the case without uncertainty reduction. However, as the failure probabilities are relatively small, the overall effect is expected to be small as well (Klerk et al, 2018;Roubos et al, 2018).…”
Section: Towards Practical Implementation Of the Frameworkmentioning
“…If the reliability of dikes is changing significantly in time, one also has to consider reinvestments. However, due to the dependence of slope stability reliability on time-independent ground-related uncertainty, slope stability of dikes (and other geotechnical structures, see e.g., Roubos et al (2018)) is typically rather time independent. Therefore, in an economic optimization one can estimate the annual target reliability by considering an infinite time horizon, such that the optimal level of protection b T , follows from the following minimization:…”
Section: Methodsmentioning
confidence: 99%
“…A reference period of 1 year is assumed, in line with common practice for flood defence structures. It should be noted that in some cases for geotechnical structures, the use of other reference periods might be more adequate (Roubos et al, 2018), and for instance the time factors provided in Diamantidis et al (2019) may be applied. The cost of the reference strategy without monitoring and proof loading is defined as c 0 : The Value of Information (VoI) of a strategy fp,m,dg can be computed by:…”
Section: Framework To Support Decision-making Towards Efficient Utilimentioning
confidence: 99%
“…Consequently the future failure probability might be overestimated in cases with large knowledge uncertainty, most notably the case without uncertainty reduction. However, as the failure probabilities are relatively small, the overall effect is expected to be small as well (Klerk et al, 2018;Roubos et al, 2018).…”
Section: Towards Practical Implementation Of the Frameworkmentioning
“…(1) breakwater design (Koc 2009), (2) quay wall design (Roubos et al 2018), (3) land reclamation (Lendering et al 2015), and (4) dredging (Nebot et al 2017). When conducting a literature review on peer-reviewed research containing checklists that can be used in risk identification for construction projects, it appears that publications can be categorized as follows:…”
Section: Published Research On Construction Project Risksmentioning
This paper presents the risk identification process, a checklist of 215 different risks, and an associated risk breakdown structure (RBS) for the design and construction phases for a shipping port and associated container terminal. The case study project scope for the research includes a 3,500-m breakwater, 80 ha of reclaimed land, a 1,000-m-long quay wall, port equipment, and buildings. The checklist is categorized according to the project work breakdown structure (WBS) and includes risks associated with (1) breakwater, (2) reclaimed land, (3) entrance canal and basin, (4) quay wall, (5) container yard and buildings, (6) power supply, and (7) project management office. Since the research outcome was developed by subject matter experts during an actual project, it can be used during risk identification, as a completeness check after risk identification on similar projects, or for individual activities (e.g., quay wall construction) per the required project scope. The research also includes a list of risks that specifically relate to marine construction.
“…The units and parts of modules limiting reliability are used for the assessment of reliability. Alfred [18] developed a method to determine the influence of time-independent variables on the development of failure probability over time. This method can be also used to evaluate target reliability indices of other civil and geotechnical structures.…”
Section: The Connotation Definition and Literature Analysis About Conmentioning
The control of the construction quality is very important in the construction industry. In this paper, the fuzzy reliability and construction quality are linked together to establish a specific quantitative evaluation model, which not only can help to make up for the lack of the traditional reliability qualitative evaluation methods, but also can avoid the inaccuracy of fuzzy quantitative evaluation of construction quality to a certain extent. This paper firstly selects some influencing factors of construction quality, and then makes use of complex vague soft expert set theory to study the construction quality and reliability. By the operational relationship and quantitative evaluation index, the membership functions of each subset are obtained, and different evaluation intervals are divided, it is helpful to draw the quantitative evaluation results of quality within a reasonable range and improve the accuracy of the quality and reliability. The presented hybrid method and detailed steps can provide some references for the reliability evaluation of construction quality.
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