what live load to use to design for footings

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live load reduction whether applicable for footing?

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kprakaash SEFI Fellow member Joined: 04 Aug 2009 Posts: 8 Location: chennai	Posted: Friday Feb 21, 2014 xi:45 am   Post subject: alive load reduction whether applicable for footing? Dear SEFIans, live load reduction whether applicable for footing? if aye, pls tell me reference w.r.to IS code if no, for tat likewise pls tell me ref in which code it states not to take live load reduction Regards, Prakash
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Dr. N. Subramanian General Sponsor Joined: 21 Feb 2008 Posts: 5493 Location: Gaithersburg, MD, U.South.A.	Posted: Fri February 21, 2014 2:48 pm   Postal service subject: Re: live load reduction whether applicable for ground? Love Er Prakash, When columns could exist designed for live load reductions as per IS 875, naturally that applies to footings that back up them should  besides. Best wishes, NS
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umeshrao ... Joined: 23 Aug 2010 Posts: 573 Location: Bangalore, India	Posted: Sabbatum February 22, 2014 xi:25 am   Post subject: Re: live load reduction whether applicable for ground? Dr. Due north. Subramanian wrote: Dear Er Prakash, When columns could be designed for alive load reductions as per IS 875, naturally that applies to footings that support them should  too. Best wishes, NS Dear Dr. Subramanian, I agree with yous that basis needs to be designed for the same load every bit that has been considered for lowest level column. However regarding the question raised past Mr. Prakash in his posting, I belong to a school of thoughts that codes tin not  be written for all cases. It can make statements negating only if barred. Such as moment redistribution shall not be done in EQ , etc,etc. Or shear shall not exceed etc. Hence non mentioned in the lawmaking may not exist a reason non to follow. Similar to should deflection cheque be washed or not for cantilever retaining walls, or water tank walls ,etc. I call back all engineers need to understand the spirit of lawmaking and reasons for the provision in the lawmaking. Similar why not write acceptance criteria of concrete may be 35 or 56 days. If engineers experience that for a situation y'all practice non find a reference in the lawmaking individual may accept a decision and implement. Regards Umesh Rao
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Dr. N. Subramanian General Sponsor Joined: 21 Feb 2008 Posts: 5493 Location: Gaithersburg, MD, U.s.a.A.	Posted: Sabbatum Feb 22, 2014 2:33 pm   Post bailiwick: Re: live load reduction whether applicable for footing? Dear Er Umesh Rao, You are admittedly correct. Codes are in that location for guidance only and the structural Engineer has to accept the right decision. Fifty-fifty codes modify periodically due to the research undertaken. Simply the codes will be invaluable for the inexperienced designer, who does not know what are the things to check. Regards, NS umeshrao wrote: Dr. Due north. Subramanian wrote: Beloved Er Prakash, When columns could be designed for live load reductions as per IS 875, naturally that applies to footings that support them should  also. All-time wishes, NS Honey Dr. Subramanian, I agree with y'all that footing needs to exist designed for the same load as that has been considered for lowest level column. However regarding the question raised past Mr. Prakash in his posting, I belong to a schoolhouse of thoughts that codes can not  exist written for all cases. It can make statements negating only if barred. Such as moment redistribution shall not exist washed in EQ , etc,etc. Or shear shall not exceed etc. Hence not mentioned in the code may not be a reason non to follow. Similar to should deflection check be done or not for cantilever retaining walls, or water tank walls ,etc. I remember all engineers need to understand the spirit of lawmaking and reasons for the provision in the code. Similar why not write acceptance criteria of concrete may be 35 or 56 days. If engineers experience that for a state of affairs you do non find a reference in the code private may take a decision and implement. Regards Umesh Rao
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jiwaji ... Joined: 08 Apr 2009 Posts: 75 Location: Jamshedpur	Posted: Mon February 24, 2014 5:05 am   Post bailiwick: live load reduction whether applicable for footing? While it is perfectly understandable that Codes are written for a broad guidance and cannot be explicit in, or cover,all real-life design situations, most Government/EPC Vendors who design with mainly commercial priorities insist on going by the letter than the spirit and technical implications, when their work comes for a review by Consultants. One way to handle this is to conspicuously specify in the Codal general guidelines that qualified and experienced Design Engineers in charge of quality assurance and technical aspects of a Project should exist the concluding and sole interpreters of the provisions of the relevant Code, and non anyone else, to the lowest degree of all other persons not directly involved in such quality-command,or who are non competent plenty due to whatsoever reason. In other words interpretation of the Codes should not exist left to 1 and all. Jiwaji Y Desai GM(C) TCE Jamshedpur TCE Firm, Pipeline Road Sakchi, Jamshedpur 831001 "Dr. N. Subramanian" <forum@sefindia.org> 02/22/2014 08:08 PM    Please respond to general@sefindia.org To general@sefindia.org   cc Field of study [SEFI] Re: live load reduction whether applicative for footing? Honey Er Umesh Rao, You lot are absolutely correct. Codes are there for guidance only and the structural Engineer has to take the correct decision. Fifty-fifty codes change periodically due to the inquiry undertaken. Only the codes will be invaluable for the inexperienced designer, who does not know what are the things to check. Regards, NS umeshrao wrote: Quote: Dr. N. Subramanian wrote: Quote: Dear Er Prakash, When columns could be designed for alive load reductions as per IS 875, naturally that applies to footings that support them should likewise. Best wishes, NS Dear Dr. Subramanian, I agree with you that footing needs to be designed for the same load as that has been considered for lowest level column. Nonetheless regarding the question raised past Mr. Prakash in his posting, I belong to a school of thoughts that codes tin can not be written for all cases. Information technology can make statements negating simply if barred. Such as moment redistribution shall not be done in EQ , etc,etc. Or shear shall not exceed etc. Hence not mentioned in the code may not exist a reason not to follow. Similar to should deflection check exist done or not for cantilever retaining walls, or water tank walls ,etc. I think all engineers demand to understand the spirit of code and reasons for the provision in the code. Like why not write acceptance criteria of concrete may be 35 or 56 days. If engineers feel that for a state of affairs you do not notice a reference in the lawmaking private may accept a conclusion and implement. Regards Umesh Rao - -- Posted via Email
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kprakaash SEFI Member Joined: 04 Aug 2009 Posts: 8 Location: chennai	Posted: Mon February 24, 2014 6:15 am   Mail subject: Re: alive load reduction whether applicative for footing? thank you very much for your valuable reply to both of you ( Due north.S sir and umesh sir) since the blueprint to be submitted for consultant blessing. for the decision to make, there should be some back reference w.r.to code. otherwise he may induce his decision to follow. that is the reason i had asked for code reference. i one time once again thank u for the valuable comments. Regards, Prakash Dr. N. Subramanian wrote: Dear Er Umesh Rao, You lot are admittedly correct. Codes are at that place for guidance only and the structural Engineer has to take the correct decision. Fifty-fifty codes alter periodically due to the research undertaken. But the codes will exist invaluable for the inexperienced designer, who does not know what are the things to bank check. Regards, NS umeshrao wrote: Dr. N. Subramanian wrote: Dear Er Prakash, When columns could be designed for live load reductions as per IS 875, naturally that applies to footings that support them should  also. Best wishes, NS Dear Dr. Subramanian, I agree with you that ground needs to be designed for the aforementioned load every bit that has been considered for lowest level column. However regarding the question raised past Mr. Prakash in his posting, I belong to a school of thoughts that codes can not  exist written for all cases. It can make statements negating only if barred. Such as moment redistribution shall non exist done in EQ , etc,etc. Or shear shall not exceed etc. Hence not mentioned in the code may not be a reason non to follow. Similar to should deflection check exist done or non for cantilever retaining walls, or h2o tank walls ,etc. I recall all engineers need to understand the spirit of code and reasons for the provision in the code. Like why not write acceptance criteria of concrete may exist 35 or 56 days. If engineers experience that for a situation y'all practice not find a reference in the code private may take a decision and implement. Regards Umesh Rao
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rahul.leslie Full general Sponsor Joined: 01 April 2008 Posts: 493 Location: Trivandrum	Posted: Monday Feb 24, 2014 6:26 am   Mail subject: Delight check the following clause  in IS:875 - 3.two.1 For Floor Supporting Structural Members - Except as provided for in 3.two.i.ane, the post-obit reductions in causeless total imposed loads on floors may be made in designing columns, load bearing walls, piers, their supports and foundations. ... followed by the table of no. of floors supported and %-reduction. Rahul Leslie
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prof.arc ... Joined: 26 Jan 2003 Posts: 703	Posted: Tue February 25, 2014 12:25 am   Post subject: live load reduction whether applicative for footing? Some clauses of all Codes are generally vague [in the sense that they cannot be justified by theory] and therefore subject to mis-interpretation. BIS must exist fabricated duty bound to clarify [interpret] clauses where there is ambivalence Ane alternative in example of IS:1893 is to request organizations like NICEE to generate a handbook and all structural engineering science organisations hold to bide past information technology. This is because the reviewers of design need non have more knowledge than the designer only have more power to enforce their viewpoint ARC . On ii/24/14, jiwaji <forum@sefindia.org> wrote: Quote: While it is perfectly understandable that Codes are written for a broad guidance and cannot be explicit in, or cover,all real-life design situations, most Authorities/EPC Vendors who design with mainly commercial priorities insist on going by the letter than the spirit and technical implications, when their piece of work comes for a review by Consultants. One style to handle this is to conspicuously specify in the Codal general guidelines that qualified and experienced Design Engineers in accuse of quality assurance and technical aspects of a Projection should exist the final and sole interpreters of the provisions of the relevant Code, and not anyone else, least of all other persons not directly involved in such quality-command,or who are not competent enough due to whatsoever reason. In other words interpretation of the Codes should not be left to one and all. Jiwaji Y Desai Posted via Email
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