An approach for time-dependent reliability analysis of Jackup structures

Figures & data

Figure 1. Trajectory of time dependent limit state.

Figure 2. Flow chart for the methodology.

Table 1. Wave parameters

Return period (Years)	Hs (m)	Tz (m)
100	12.00	10.81
1000	13.25	11.36
106	16.45	12.66

Figure 3. Jackup idealised model used in the study.

Figure 4. Surface elevation of a wave with P-M spectral energy density described by significant wave height H_s = 12 m and wave period T_z = 10.81 m (10² years return period).

Figure 5. Surface elevation of a wave with P-M spectral energy density described by significant wave height H_s = 13.25 m and wave period T_z = 11.36 m (10³ years return period).

Figure 6. Surface elevation of a wave with P-M spectral energy density described by significant wave height H_s = 16.45 m and wave period T_z = 12.66 m (10⁶ years return period).

Figure 7. Mean crossing rates as a function of deck displacement computed using Poisson assumption method.

Figure 8. Mean crossing rates as a function of deck displacement computed using VanMarckes approximation method.

Figure 9. Time dependent probability of failure for 100 years return period.

Figure 10. Time dependent probability of failure for 1000 years return period.

Figure 11. Time dependent probability of failure for 10⁶ years return period.