Expansion Joint for R.C.C Structure

[AshiqRumi]

I am designing a School Building (R.C.C) Which is 150 ft Long and 38 Feet in width.

do i need a expansion joint for the length of 150 feet of the structure??

can anyone give me any codal reference for that ???

 

[JAE]

Usually for concrete structures we would allow 200 to 240 ft. before an expansion joint.
No code that I know of requires this - just common practice. The AISC steel manual has a small chart near the front that discusses this for steel, concrete, etc.



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[Teguci]

Consider the following:
- If you have a rigid shearwall system in the far corner of the building, then the other corner of the building will have 150 ft of shrinkage and thermal change to accommodate. If you have a flexible frame system centered on your building, then the volume change calculation will only be for half the building length.

I recommend having a look at the volume change calculations and detailing in the PCI manual. There is a lot of forgiveness in a framed reinforced concrete building so I suspect the 150 ft length will not require an expansion joint.

 

[DETstru]

You can try looking at Appendix C of ASCE 7-10, which discusses a number of serviceability considerations. I don't believe it gives you hard-and-fast numbers for when you need a joint but it'll at least give you some insight.

 

[AshiqRumi]

JAE: Thanks for your observation. i will look into The AISC manual.

Teguci: as my building is framed reinforced concrete building so I suspect the 150 ft length will not require an expansion joint.
But i will check the calculations of PCI Manual.

DETstru: yes i have found that Appendix C of ASCE 7-10 but it's just considering the expansion joint thing. not giving any more details.


i have found some guideline in technical Report 65: Expansion Joints in Buildings of The National Academies Press


There i found this Graph which made me understand that, in low temperature difference and length below 200ft a building Need not to be subjected to Expansion joint.

Link:

http://www.nap.edu/catalog/9801/expansion-joints-in-buildings-technical-report-no-65

Give me your opinion in this regard.

 

[JAE]

AshiqRumi - that document (graph) you posted is essentially the same graph in the AISC manual.

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[AshiqRumi]

JAE: Yes, it is same graph because AISC took it from that Technical Report. (i found it from the reference list of AISC manual)

so i believe this graph is quiet reliable.

do you have any other opinion ?

please share....