Developing target reliability for novel structures: the case of the Mobile Offshore Base

Large Floating Structures

“…For progressive failures of the mooring system, which may lead to a drifting of Mega-Float, the collapse behavior of a single dolphin was investigated by pushover analysis. It is interesting to note that the same value for annual target reliability was arrived at independently for Mobile Offshore Base (Bhattacharya et al 2001). First, the safety level of several activities in Japan, such as transportation, accidents, and natural disasters, was examined and expressed in terms of fatal accidental rate (FAR, the number of victims per 100 million man-hours of activity).…”

Application of the Risk-Based Seismic Design Procedure to a Reinforced Concrete Frame Building

“…The acceptable collapse probability P C or reliability index β can obtained from codes and guidelines (e.g. [1,19,20]) or from other models of acceptable/tolerated risk, such as equations proposed by Allen and CIRIA [21] or by Helm's model [22] of tolerable risk. These models and corresponding equations of acceptable risk have been described elsewhere [11].…”

“…Firstly, an acceptable risk was assessed using the models of ISO [19], EC0 [1], JCSS [20], CIRIA [21], Allen [21] and Helm [22]. Some models of acceptable risk (e.g.…”

Reliability of redundant ductile structures with uncertain system failure criteria

“…A structural system may also possess system failure modes such as excessive global deformation that do not necessarily involve any component failure. Further, there is no assurance that the component-based safety criteria will be adequate if they are applied in relatively novel structures where there may be little experience and unexpected failure modes such as a progressive collapse sequence (Bhattacharya et al 2001). It is thus clear that the system reliability of a structure may not possess a high correlation with the reliability of its critical components and a design by components cannot guarantee an optimally designed system at least from reliability considerations.…”