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Design a square reinforced concrete footing for the following conditions: - The column has a DL = 100 kips, a LL = 120 kips, and is a 15” x 15” with 4 #8 bars; - The footing is upon a soil with q all = 4 ksf with a FS=2.5; use f’ c = 3000 psi and ƒy = 50 ksi. Solution. Step 1. Find the footing dimensions (for service loads). Use B = 7.5 ...
Biaxial Footing Design Posted April 14th, 2008 by admin FOOTING-1 RCC Isolated Footing Biaxial - IS method This spreadsheet is on bi-axial design of isolated footing using IS method. This bi-axial footing design can take care of both the cases of Positive and Negative pressure.
ez = Eccentricity along Z-axis from center of gravity of footing = Mx / P For isolated rectangular footings, calledfootings now onwards, when the loading point k(ex, ez) lies in middle third of the footing, calledKern (shaded area in Fig. 1), magnitude of p is positive and the soil below footing is said to be in compression.
The main benefits of connecting spread footing by ties in both the direction is to counter differential settlement due to ground shaking. It is beneficial to connect the footing at bottom level not at footing top level in case of individual footing. Following are the statement of IS code:- IS 1893(P-1) 2002 - Clause 7.12.1:- Foundations
Subject: [SEFI] Re: Connecting spread footing by tie beams at footing top level. Dear Sh AK Jha jee A structure on isolated footings definately requires provision of tie beams in both directions at footing level as EQ resistant measure. The provision of tie-ing footings is treated to be fulfilled through Plinth level
The raft foundation is a kind of combined footing that may cover the entire area under the structure supporting several columns in one rigid body. In this project, the soil profile shows that the bearing stress is around 100 kN/m2 . The raft foundation is usually used with this kind of soil. The columns have high axial loads.
Subject: [SEFI] Self weight of spread footing not considered in design Dear All, Why self weight of spread footing and weight of soil above the footing, is not considered for the design of footing? Regards, Priyanka Make Yahoo!7 your homepage and win a trip to the Quiksilver Pro. Find out more. Posted via Email
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Posted: Wed Nov 04, 2009 7:36 am Post subject: Connecting spread footing by tie beams at footing top level Dear Sai (Structure) It is likely you may have got confused by the replies to your query, just like me, whether to provide tie beams or not - both at footing top level as well as at ground level for a soil whose SBC is around 25 Tons/sqm.
It's pin base. Under Earthquake load it has horizontal shear. To check footing for overturning or soil pressure do i have to add horizontal component times depth of the footing for moment. or i can design the grade beam for the axial load so that i do not have to add any moment to check the footing. Eccentricity = P/A +- M/S