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Debonding of Strands: Prestressed Concrete Girders

 
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gaurah
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Joined: 20 Jan 2013
Posts: 2

PostPosted: Sun Jan 20, 2013 11:43 pm    Post subject: Debonding of Strands: Prestressed Concrete Girders Reply with quote

Dear all,            
For my research work at University of Cincinnati, which is a sponsored project by National Cooperative Highway Research Program (NCHRP) ,USA, we are compiling information on debonding of strands in prestressed concrete Girders.I was wondering if there is any prevalent debonding practice in India and if yes, which would be the best online source  to get information/specifications.
I am new to this forum and is amazed by the dynamicity of the group.
Regards
Avdhesh
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kamal
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Joined: 08 May 2010
Posts: 10
Location: MUMBAI

PostPosted: Tue Mar 26, 2013 4:26 am    Post subject: Reply with quote

hi ,
i have used partial & fully debonded strands in u -type pretensioned girders for mumbai metro line-1 project in india.

as girders were precast pretensioned & different spans of girders are cast in one casting bed so prestressing strands provided for the maximum span & for smaller spans & few strands ( as per design requirement) are debonded by putting sleeve.



Regard's

kamal sharma
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gaurah
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Joined: 20 Jan 2013
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PostPosted: Tue Mar 26, 2013 5:59 am    Post subject: Reply with quote

Dear sir,
               Thanks alot for your response. Do you have any information regarding the specification/code used for debonding practice. Or if it is practiced based on non-indian specification as i couldnt find any information on debonding in prestressed bridge code.

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Avdhesh
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d_bhawal
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Joined: 15 Oct 2010
Posts: 4

PostPosted: Sat Mar 08, 2014 10:09 pm    Post subject: Reply with quote

Avdhesh,

1. For Indian Railways or corporations like Delhi Metro etc.  generally specifications provided for development lengths are referred to IRS-CBC
2. For Highways /Road transport related bridges/flyovers where pretensioned -PSC members are used  IRC 112-2010 is generally followed.
3. Now as far as the allowable  % of debonding of strands per section is concerened - there is no stipulated rule . Where in most of the cases the design requirement (e.g. maintaining stress levels/min % of main rebars to account for shear  etc ) / experience as gained through practice helps in deciding the nos of strands to be debonded /how much length shall be considered for the purpose of debonding.
4. There are different guidelines in various countries/states, specially those which have permanent workshops etc to manufacture precast-girders have their own gudielines.
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