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temp reinf't

 
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sandeep01
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Joined: 05 May 2012
Posts: 20

PostPosted: Tue May 15, 2012 12:05 pm    Post subject: temp reinf't Reply with quote

Dear All,

My question is about the temperature reinf't whether it should be added to the reinf't required for bending. I thought that the bridge forums is more adequate since all the bridges will be exposed to temperature analysis (exposed areas).

All the bridges are designed as one way slab or frame. ACI states that shrinkage and temp. reinf't should be placed perpendicular to the main reinf't (not to be added to the reinforcement of the main direction).

If it is the case, why in the load combinations do we include the effect ot T combined with the gravity loads ?

Your help is appreciable.

Thank u
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PrasantaC
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Joined: 13 May 2009
Posts: 10

PostPosted: Tue May 22, 2012 7:51 am    Post subject: Reply with quote

The explanation to the query may be as follows:

Firstly we design various members as linear structural entities, where the expansion and shrinkage in all possible direction are not taken into account.

Secondly it is the detailing(i.e. the spacing) which prevents cracking due to  expansion and contraction , though area of steel in a cross section holds its importance as well.

Thirdly as could be understood from Indian codes, the provision of temperature reinforcement is not based on thermal stress, which obviously is being taken care of in ay analysis.

If detailing of structural reinforcement in all directions are good enough to prevent cracking due to expansion and contraction, then no extra reinforcement is warranted on this account.
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sandeep01
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Joined: 05 May 2012
Posts: 20

PostPosted: Tue May 22, 2012 8:32 am    Post subject: fw: temperature reinf't Reply with quote

Dear
Prasantac,



Thanks for the answer. So u assume that the reinforcement required to resist the bending moments will be enough since it will prevent too wide cracks. I am ok with this and this is what is stated in the ACI code (american code applicable to the buildings).



But why do u think that the effect of temperature is included in the load combinations in addition to the pemanent and surcharge exterior loads ?



Regards
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