Beams and slab. In case of Unsafe Flat Raft Slab / Hidden beam Design, any one or all of the following Corrective measures shall be adopted. Beam and slab raft foundation •As a foundation to support the heavier loads of walls or columns, a solid slab raft would require considerable thickness. • explain the two major and other requirements of the design of foundation, ... Till now we discussed the different structural elements viz. 0000005368 00000 n Excel Spread Sheet is prepared for analysis and design of raft foundation with different soil strata having different Soil Bearing capacities such as 180, 220 and 250 KN/m². 0000006056 00000 n endstream endobj 433 0 obj <>/Size 403/Type/XRef>>stream trailer Pile FoundationsDesign of Large Diameter Socketed Piles 19. 0000018443 00000 n 0000010517 00000 n Raft foundations are economic in the sense that the slab of raft can be directly used without any other concrete work. • Cast in-situ first storey, typically reinforced concrete beam and slab system. DESIGN OF FOUNDATIONS Dr. Izni Syahrizal bin Ibrahim Faculty of Civil Engineering Universiti Teknologi Malaysia Email: iznisyahrizal@utm.my. • The bearing capacity increased by combining all individual footings in to one mat –since bearing capacity is proportional to width and depth of foundations. Course Content . The beams run both ways, and the columns are located at the intersection of the beams. 0000000954 00000 n A beam and slab raft construction should be adopted when there is a symmetrical arrangement of unequally loaded columns but with uniform ground pressure. • It is used where the supporting soil has low bearing capacity. 0000005732 00000 n Mat foundations are sometimes preferred for soils that have low load-bearing capacities, but that will have to support high column or wall loads. found out required area of the raft foundation and beam and slab raft foundation for G+15 storey building. endstream endobj 404 0 obj <>/Metadata 61 0 R/Pages 58 0 R/PageLayout/OneColumn/StructTreeRoot 63 0 R/Type/Catalog>> endobj 405 0 obj <>>>/Type/Page>> endobj 406 0 obj <> endobj 407 0 obj <> endobj 408 0 obj <> endobj 409 0 obj <>stream Refer IS 2950 : Part 1 - 1981 / 1965 For Rigid Raft Design / Relative Stiffness Factor. ... Beams and slab. Design Example of a Flat Raft Foundation. The walls act as stiffeners for the mat. Age factor is considered as 1.1 . Bearing Capacity factors Shape factors Acording to IS 6403 : 1981 Making a plan for the structure and analysis of it Plan of the structure Plan of the beam and slab type raft foundation Total Imposed Load < Safe Bearing Capacity(SBC) Load carried by the exterior columns =500KN Load carried by interior columns =700KN. Design of Beam-Slab Raft Foundation Bending moment and shear force diagrams for each slabs and beams in the short direction. Beam Width / Depth > 3500 mm not permitted. 0000001800 00000 n startxref Flat plate thickened under columns. design of Raft foundation. H��TKO�0��W��9ı��H�/+��C�C�-l�h��e�=c�m*!A�"�8��7���m���l���Qu18����4����o�Tq��*�}Z@5��/W�f�^��q8 ��$8[�BN!��F�,�/X�~�hz6���Q��x�J)�7�@�)JN9)�#$��E��l�/�Ry�����i>"4? It is also called as mat foundation which are widely used foundation system. Design of Mat/Raft Foundation • Mat or raft foundation is a large concrete slab supporting several columns in two or more rows. Shallow foundation usually is the more economical option. However, crack widths should be less than 0.3 mm. Depth of slab should be constant … H�\�_k�@��|�ylJ4s�� Introduction •Foundation –Part of structure which transmits load from the structure to the underlying soil or rock •All soils compress noticeably when loaded causing structure to settle. 02. 0000006911 00000 n main designer has designed it as a raft foundation with a bearing capacity of 150 kn/m2 but after the site development and excavation we found a hard strata that can with stand with 250 kn/m2(as per the soil report). A 3-D three storeyed building frame resting on piled-raft foundation is considered for the study. www.geodomisi.com Section Civil & Geotechnical Engineering Calculations for Sheet no./rev. Circular and Annular Rafts 16. Revise Hidden Beam / Flat Raft Slab thickness. Job Ref. 434 0 obj <>stream Compensated Foundations, Cellular Rafts and Basement Floors 14. %%EOF 0000007394 00000 n 0000007794 00000 n slab 150mm Beams B200X450M25, B200X600M25, B300X450M25, B300X600M25, ... “Structural Design of Raft Foundation” Qatar University College of Engineering (Course: Design Of Reinforced Concrete Structures) [5]. 0000018701 00000 n Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. Mat (Raft) Foundations Column Footing Plan view Cross section. A�ڂ��u��d������;'�ta�dr�0ɷ�ݾk'����'wj�f���6�����eᚶ�>������ܯS��S�������i���M��c���8���=��]~� �G��nr�^�&�ҍ�U���]>/{�7�|;ݟҚW�����%1u���P�q��s��E:֮|K�:�]��y]q��T�WcV�x�H? As a general rule, consider deep foundations only when shallow foundations do not give satisfactory design. This course will addresses the 02. ��E?J��6���Gُ�c?�~�~���7��~���7��~���7��~���7��~���O?�\���,� ���o㘶��ʘ�-vl�ů���.��'�+� Q�k Ppt design of raft foundation based on beam and slab raft foundation page 3 mat foundation types of a typical stiffened raft design adapted what is raft foundation types ofManual Design … In this project, the research focused on the raft or mat foundation which is in the shallow foundations classification. Design of Beam-Slab Raft Foundation Check the shear stress. 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