Module 11 - NPTel

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5. Strip foundation or wall footings These are in long strips especially for load bearing masonry walls or reinforced concrete walls (Figs.11.28.10). However, for load bearing masonry walls, it is common to have stepped masonry foundations. The strip footings distribute the loads from the wall to a wider area and usually bend in transverse direction. Accordingly, they are reinforced in the transverse direction mainly, while nominal distribution steel is provided along the longitudinal direction. Version 2 CE IIT, Kharagpur
6. Raft or mat foundation These are special cases of combined footing where all the columns of the building are having a common foundation (Fig.11.28.11). Normally, for buildings with heavy loads or when the soil condition is poor, raft foundations are very much useful to control differential settlement and transfer the loads not exceeding the bearing capacity of the soil due to integral action of the raft foundation. This is a threshold situation for shallow footing beyond which deep foundations have to be adopted. Version 2 CE IIT, Kharagpur
Page 1 and 2: Module 11 Foundations - Theory and
Page 3 and 4: Instructional Objectives: At the en
Page 5 and 6: periodic inspection and maintenance
Page 7 and 8: 2. Isolated footings Version 2 CE I
Page 9 and 10: Version 2 CE IIT, Kharagpur
Page 11 and 12: 3. Combined footings Version 2 CE I
Page 13: 4. Strap footings When two isolated
Page 17 and 18: As mentioned earlier, the shallow f
Page 19 and 20: 11.28.5 Design Considerations (a) M
Page 21 and 22: (ii) half the effective depth of th
Page 23 and 24: (g) Transfer of load at the base of
Page 25 and 26: cl.26.2 of IS 456, when transfer of
Page 27 and 28: The foundation, assumed to act as a
Page 29 and 30: From the known value of A, the dime
Page 31 and 32: In a more general case, as in the c
Page 33 and 34: A.2: Figure Nos. 11.28.1 to 11. Q.3
Page 35: A.TQ.2: See sec.11.28.4. TQ.3: What

Module 11 - NPTel

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