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Lec4_Piled Raft

20-Oct-15 Permissible

20-Oct-15 Permissible settlements: As per IS – 1904, 1986 (Reaffirmed1995): For spread foundation resting on Sand and Hard clay Maximum settlement (mm) Isolated Raft Type of structure foundation foundation For reinforced concrete structures 50 75 Prof. V.S.Raju Consultants 27 Details of piled raft foundation of the buildings in Germany (Katzenbach,et.al., 2000) Structure Messe Torhaus Messeturm DG-Bank (Westend Strasse 1) American Express Max Height above ground surface (m) 130 256.5 208 74.7 Basement floors 0 2 3 4 Foundation area (m 2 ) Foundation level below GL (m) 2 x 430 3457 2940 3570 -3 -14 -12.0/-14.0 -14 Raft thickness (m) 2.5 3.0-6.0 3.0-4.5 2 Number of piles 2 x 42 64 40 35 Observed pile load (MN) 1.7-6.9 5.8-20.1 9.2-14.9 2.7-5.1 Observed Max. settlements (mm) Prof. V.S.Raju Consultants 150 144 110 55 Contd… 28 V.S.Raju Consultants 14

20-Oct-15 Structure Forum(Kastor Taunustor and pollux) Japan- Centre Congress centre Messe Frankfurt Main Tower Eurotheum Max Height above ground surface (m) 115.3 94/130 51.6 198 110 Basement floors 4 3 2 5 3 Foundation area (m 2 ) 1920 14000 10200 3800 1830 Foundation level below GL (m) -15.8 -13.5 -8 -21 -13 Raft thickness (m) 1.0-3.5 1.0-3.0 0.8-2.7 3.0-3.8 1.0-2.5 Number of piles 25 26/22 141 112 25 Observed pile load (MN) Observed Max. settlements (mm) 7.9-13.8 7.4-11.7/5.0- 12.6 4.2-6.5 1.4-8.0 1.8-6.1 60 80 40-60 25 32 Prof. V.S.Raju Consultants 29 Settlement of the piled raft foundation of the Burj Dubai: ‣ 160 storey high rise tower ‣ Founded on 3.7 m thick raft supported on bored piles (1.5 m diameter, 50 m long). ‣ Estimated total settlement is 45 mm to 75 mm. ‣ Settlements under dead load (February 2008) 43 mm. ‣ Extrapolated to full load is 55 mm to 60 mm ‣ Predicted final settlement is 70 to 75 mm Prof. V.S.Raju Consultants 30 V.S.Raju Consultants 15

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