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PSC box design as per IRC:112-2011

 
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mohan1441
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Joined: 18 Jun 2008
Posts: 2

PostPosted: Sat Apr 13, 2013 7:45 am    Post subject: PSC box design as per IRC:112-2011 Reply with quote

Dear all,
In design of PSC box girder as per IRC:112-2011,
<xml><o> </o>
The following Load combinations as given in Table 3.3 of IRC:6-2010 have been checked ..
For Max. & min stress limits

  1. Serviceability Limit state:Rare combination   (1.0DL+1.0SIDL+1.0WC+1.0PRESTR+1.0LL+0.6TL)

  2. Serviceability Limit state:Rare combination (1.0DL+1.0SIDL+1.0WC+1.0PRESTR+0.75LL+1.0TL)
    <o> </o>
    For Deflection,crack width

    1. Serviceability Limit state:Frequent combination (1.0DL+1.0SIDL+1.0WC+1.0PRESTR+0.75LL+0.5TL)

    2. Serviceability Limit state:Frequent combination (1.0DL+1.0SIDL+1.0WC+1.0PRESTR+0.2LL+0.6TL)
      <o> </o>
      For Permanent stress

      1. Serviceability Limit state:Quasi-permanent combination (1.0DL+1.0SIDL+1.0WC+1.0PRESTR+0.5TL)
        <o> </o>
        My query is in above all combinations psf for prestess is 1.0, whereas in IRC:112-2011, cl.7.9.5 po.no:6 ,in serviceability limit state, psf of 1.1 & 0.9 shall be used for prestress, in such case, is it reqd. to check the above LCs for these two factors separetaly.
        Kindly explain above clause.



        regards
        P.C.Mohan
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akshat_bansal
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Joined: 29 Oct 2013
Posts: 2

PostPosted: Tue Oct 29, 2013 7:54 am    Post subject: Reply with quote

In IRC:6-2010, in notes below it is mentioned in point no. 4 that factors from prestressing need to be taken from relevent code (i.e. IRC:112 in this case).

Out of 1.1 and 0.9, the factor which is unfavourable needs to be considered. In complex structures, it would be best to check with both factors. Otherwise in simply supported bridges judgement can be used to select which factor to be used. If it is not clear, it is best to check with both 1.1 and 0.9.

_________________
Regards,

Akshat Bansal
Chief Technical Officer
Force Structural Engineers Pvt. Ltd.
www.force-se.com
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