TY - JOUR
T1 - Target reliability indices for existing quay walls derived on the basis of economic optimisation and human safety requirements
AU - Roubos, Alfred
AU - Allaix, Diego
AU - Fischer, Katherina
AU - Steenbergen, Raphael
AU - Jonkman, Sebastiaan
N1 - Accepted Author Manuscript
PY - 2019
Y1 - 2019
N2 - General frameworks for reliability differentiation have evolved over time and are mainly developed for buildings. However, recommendations for the safety of existing quay walls are lacking. In this study, target reliability indices for assessing existing quay walls were derived by economic optimisation and by evaluating the requirements concerning human safety. In quay-wall design, some dominant stochastic design variables are largely time-independent, such as soil and material properties. The influence of time-independent variables on the evolution of the probability of failure was taken into consideration, since this affects the present value of future failure costs and the associated target reliability indices. The target reliability indices obtained for existing quay walls depend on the consequences of failure and the remaining lifetime. If the failure modes of a quay wall are governed by time-independent design parameters and the quay wall has already survived the early service period, the residual probability of failure is lower for an existing quay wall compared to a new structure. Hence, this should be considered in the determination of target reliability indices. The method to evaluate quay-wall reliability over time can also be used to assess other civil and geotechnical structures.
AB - General frameworks for reliability differentiation have evolved over time and are mainly developed for buildings. However, recommendations for the safety of existing quay walls are lacking. In this study, target reliability indices for assessing existing quay walls were derived by economic optimisation and by evaluating the requirements concerning human safety. In quay-wall design, some dominant stochastic design variables are largely time-independent, such as soil and material properties. The influence of time-independent variables on the evolution of the probability of failure was taken into consideration, since this affects the present value of future failure costs and the associated target reliability indices. The target reliability indices obtained for existing quay walls depend on the consequences of failure and the remaining lifetime. If the failure modes of a quay wall are governed by time-independent design parameters and the quay wall has already survived the early service period, the residual probability of failure is lower for an existing quay wall compared to a new structure. Hence, this should be considered in the determination of target reliability indices. The method to evaluate quay-wall reliability over time can also be used to assess other civil and geotechnical structures.
KW - corrosion
KW - existing quay walls
KW - human safety
KW - past performance
KW - probability of failure
KW - risk acceptance criteria
KW - Target reliability index
UR - http://www.scopus.com/inward/record.url?scp=85076919845&partnerID=8YFLogxK
U2 - 10.1080/15732479.2019.1699937
DO - 10.1080/15732479.2019.1699937
M3 - Article
AN - SCOPUS:85076919845
SN - 1573-2479
VL - 16 (2020)
SP - 613
EP - 625
JO - Structure and Infrastructure Engineering
JF - Structure and Infrastructure Engineering
IS - 4
ER -