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Distributed Loads

Distributed Loads. Strip Loads (L/B > 9) Wall Footings Embankements Circular Loads (R) Storage Tanks Rectangular Loads (BxL) Spread Footings Mat Foundations Combination Loads. Strip Load Fig 5.12. D p/q= fn {2x/B, 2z/B} See Table 5.4. Stress Isobars. Fig 5.14. Example 5.5.

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Distributed Loads

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  1. Distributed Loads • Strip Loads (L/B > 9) • Wall Footings • Embankements • Circular Loads (R) • Storage Tanks • Rectangular Loads (BxL) • Spread Footings • Mat Foundations • Combination Loads

  2. Strip LoadFig 5.12 Dp/q= fn {2x/B, 2z/B} See Table 5.4

  3. Stress Isobars

  4. Fig 5.14 Example 5.5 q=200 kN/m2, B=6m, z=3m

  5. Circular LoadsFig 5.15 Ds/q=1-1/[(R/z)2+1]3/2 Ds/q = fn {z/R} (Table 5.5)

  6. Circular LoadsFig 5.16

  7. Rectangular LoadsFig 5.17 Ds/q = I2 I2 = fn {m=B/z, n=L/z} Fig 5.18

  8. Variation of I2

  9. Rectangular LoadsFig 5.19 Principle of Superposition DsA/ q = (I 2-1+ I 2-2+ I 2-3+ I 2-4)

  10. Stress Isobars

  11. Combined AreasFig 5.22

  12. Combined AreasFig 5.23

  13. Newmark’s Chart z Ds = (IV) q M

  14. Example 5.7

  15. Example 5.7 Z=3m Ds=(IV) q M Ds= 0.005 (600kN/9m2)(48.5) Ds = 17.78 kN/m2

  16. Newmark’s Chart

  17. Rectangular LoadsFig 5.19 C’

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