Laserfiche WebLink
14 I Port of Everett—South Terminal Wharf& Electrical Upgrades—Phase 2 <br /> Table 11 - Factors of Safety Under Various Loading Scenarios for Profile D-D' <br /> Loading Scenario Existing Condition Phase II Upgrade <br /> Static 1.96 2.21 <br /> Pseudostatic <br /> 72-year Return Period 1.48 1.70 <br /> (k = 0.079) <br /> 94-year Return Period 1.48 1.55 <br /> (k = 0.091) <br /> 144-year Return Period 1.40 1.49 <br /> (k = 0.109) <br /> 224-year Return Period 1.29 1.41 <br /> (k = 0.122) <br /> 475-year Return Period 1.16 1.38 <br /> (k = 0.144) <br /> Design Earthquake 0.99 1.18 <br /> (k = 0.189) <br /> Post-seismic Liquefied 1.07 1.19 <br /> 2-D Numerical Modelling in FLAC <br /> The slope stability of the site and seismic performance of the structure was analyzed under seismic <br /> conditions using the program FLAC.The analyses completed were intended to capture the dynamic wave <br /> propagation through the soil profile,the effects of liquefaction on both the dynamic response of the <br /> structure and the deformations of the slope, and the soil-structure interaction between the slope and <br /> wharf.The seismic stability of both the existing and proposed upgraded structures was evaluated using <br /> five input ground motion time histories,scaled to the Design Earthquake hazard level.Time histories of <br /> several pile response parameters (moment, pile curvature, and pile hinge status)were also recorded in <br /> FLAC during each ground motion, and delivered to KPFF for their internal analysis purposes. <br /> The displacements for each ground motion and structure configuration are summarized at various <br /> locations in Table 12. Our results generally show a slight increase in slope movements along the <br /> construction dike under the design event hazard level with the added piles. Deformations decrease slightly <br /> at the toe of the dike and in the downslope region as well. Preliminary results also show an improvement <br /> in the response of the piles with the Phase II upgrade.The results of the long-duration subduction motion, <br /> which is representative of a magnitude-9 Cascadia Subduction Zone event,are somewhat distinct from the <br /> rest of the ground motions.The tabulated values indicate that the proposed pile upgrades do not increase <br /> and in some cases decrease slope deformations and pile curvatures. Further information regarding the <br /> analysis and results is provided in Appendix E. <br /> 19232-01 ow <br /> December 6,2017 HARTCROIIIVSER <br />