2 A List And Briefly Describe Four Factors Which Influence The Choice Of Depth For A Strip Footing 20 Marks B A 1 (69.79 KiB) Viewed 12 times
2 A List And Briefly Describe Four Factors Which Influence The Choice Of Depth For A Strip Footing 20 Marks B A 2 (69.79 KiB) Viewed 12 times
2. (a) List and briefly describe four factors which influence the choice of depth for a strip footing? (20 marks) (b) A strip footing in sand is being designed to support a permanent loading of 600 kN/m and a variable loading of 300 kN/m. Using the partial factors for Eurocode 7 Design Approach 1 Combination 2. calculate the design vertical loading? (20 marks) (c) A width of 1.5m and a depth of 1.0m are proposed for the strip footing of (b) above. The sand has characteristic effective stress shear strength parameters of q' = 40' and c' = 0 kPa. The unit weight of the sand above the water table is 18 kN/m and the saturated unit weight of the sand is of 20 kN/m Using the partial factors for Eurocode 7 Design Approach 1 Combination 2. determine of the design is suitable if the cater table is well below foundation level? (40 marks) (d) If the water table may rise to the ground surface (.e. above the base of the foundation), determine if the design is still suitable and give a brief explanation of why or why not? (20 marks) Aide memoire: Ultimate bearing capacities of soil under strip footings: que cNc + yDNq +0.58Ny (drained conditions) ya = 1.0, y = 1.3. Yo = 1.25and ye = 1.25 "applied to tano 50 45 35 25 Meyerhet 20 15 10 5 10 100 1000 NNN Total medias
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