At 04:34 PM 22/10/2009, you wrote:
>I have one doubt regarding the design of combined footing.
>
>suppose we are designing a combined footing with two columns
>
>_____|_|_______|_|_______ ( Diagram)
>
>now the bending moment diagram will have 3
>maximum moments , one positive and two negative
>
>-ve Max- --+vemax---- -vemax
>
>_____|_|_______|_|_______
>
>when we are designing the footing slab why do we
>consider only the negative moment( on the
>cantilever portion at the edges) and find the
>depth and steel considering that moment, even if
>the positive moment is more than the negative
>moments on the cantilever portion.
We should consider both positive and negative
moments in design if both exist. We don't only
design for the negative moments unless that is all there is!
>and how do we account for the transverse bending of the footing slab.
>
>in a footing when it is isolated and combined,
>in which direction do we considered the bending
>of the footing for designing it? in longitudinal
>direction ( the direction of the line joining
>the centres of the columns) or in transverse
>direction ? for finding the depth.
You need to check both directions if it is flexural in both directions!
>
>
>
>
>Mandeep Singh. GET
>
>
>
>
>
>
>
>y§eŠËE†Ûiÿü0ÂÇšŠ{h®åŠËE¬¥8b±éšŠ\²Ç§¶Ú2¢ëâi+k¹Ën©Dž§yêìË(r&Š‰è}*.¶«œ&¥‰ú+ž&''
>Ç«½êӢ˛±Êâméè}ç¨IÒ¹»®&Þ¦Wš±è(¶ˆm¶ŸÿÃ,y¨§¶ŠàþÇš–+-Õ«)B笶*'²Ú,y¨§µ§ly¨§¶ŠàEéž™·«j|ž™¨¥Ê&lsqauo;¬zwm¢Ø^–+-ŠÊnnXœv‰šŠv§vf²mêÞ¦&lsqauo;-yÜ"¶.·*.®—«š+,Š‰ÌjG¬º·²¢ëâ²+hº¼nÈy«a¶Úÿ0±æ¢žÚ+
>
Regards Gil Brock
Prestressed Concrete Design Consultants Pty. Ltd. (ABN 84 003 163 586)
5 Cameron Street Beenleigh Qld 4207 Australia
Ph +61 7 3807 8022 Fax +61 7 3807 8422
email: gil@raptsoftware.com
email: sales@raptsoftware.com
email: support@raptsoftware.com
webpage: http://www.raptsoftware.com
******* ****** ******* ******** ******* ******* ******* ***
* Read list FAQ at: http://www.seaint.org/list_FAQ.asp
*
* This email was sent to you via Structural Engineers
* Association of Southern California (SEAOSC) server. To
* subscribe (no fee) or UnSubscribe, please go to:
*
* http://www.seaint.org/sealist1.asp
*
* Questions to seaint-ad@seaint.org. Remember, any email you
* send to the list is public domain and may be re-posted
* without your permission. Make sure you visit our web
* site at: http://www.seaint.org
******* ****** ****** ****** ******* ****** ****** ********