Raft Foundation Design And Analysis With A Practical Approach
Available Textbooks, Handbooks, Various Publications And Papers Give Widely Different Approaches For Design Of Raft Foundations. These Approaches Make Their Own Assumptions And Deal With Ideal Raft, Symmetrical In Shape And Loading. In Actual Practice Rafts Are Rarely So. A Structural Designer Engaged In The Design Of Raft Foundations Finds It Hard To Select The Method That Can Be Carried Out Within The Time And Cost Available For Design And Give Adequate Safety And Economy.This Book Covers Complete Design Of Raft Foundations Including Piled Rafts, Starting From Their Need, Type, All The Approaches Suggested So Far In Published Literature, Effect Of Assumptions Made And Values Of Variables Selected, On The Design Values Of Stresses, And Brings Out The Limitations Of These Approaches Using Actually Constructed Rafts.Results Of Studies Carried Out By The Author Are Summarised And Final Recommendations Given. Solved Examples Are Included For Each Of The Methods Recommended. Comprehensive Treatment Of The Subject Makes The Book Helpful To The Design Engineers, Engineering Teachers, Students And Even Those Who Are Engaged In Further Research.
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DESIGN APPROACH AND CONSIDERATIONS
STRUCTURAL DESIGNERS DILEMMA
SUMMARY OF STUDIES
FACTORS AFFECTING CHOICE OF METHOD OF ANALYSIS
Flexible Raft Beam on elastic foundation
Piled RaftPlate on elastic foundation
adopted analysis and design average basement beam and slab bearing capacity bearing pressure behaviour bending moments building calculated column loads combined footing approach considered construction contact pressure continuous beam deflection depth design of raft diagram differential settlement earthquake effect elastic foundation Example expansion joints factors finite element Finite Element Analysis finite element method footings and mats horizontal loads increase Indian Standard inverted floor KN/m KNm/m maximum metre modulus of elasticity modulus of sub-grade nodes pile load piled raft Plate Element pressure distribution Raft Analysis raft foundation raft moments raft stiffness raft supported raft thickness ratio reduced by 30 reinforcement Rigid Raft Seismic Force shear forces shown in Fig simple statics soil pressure soil properties spring constant standard penetration test stresses strip structural designer sub-grade reaction super-structure Table uniform value of modulus values of bending values of moments variation varying vertical loads width