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Steel and Concrete Column Connection

 
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hmhmdhussain
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PostPosted: Sat Jul 21, 2018 4:36 pm    Post subject: Steel and Concrete Column Connection Reply with quote

Dear Sefians,

Good Day to all. Currently, I am designing 3 spans Multibay Duopitch Roof having a length of 30m in each bay. The rafter is supported by Concrete columns.

In this case, I am designing a Steel rafter to concrete column connection as a Baseplate concept. As per the attached diagram. But the thing is we have a more moment in the junction steel column joint around MZ = 1300kN & Fy = 250kN

Is this possible to transfer such moment to this type of connection or Do we have any other option? Kindly let me know some ideas in this regards.

Thanks in Advance



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Steel & Concrete Column Connection

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badamsundararao
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Joined: 24 Dec 2009
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PostPosted: Sat Jul 21, 2018 4:48 pm    Post subject: steel-concrete Reply with quote

dear friend,

      You can proceed with this type of arrangement.
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Abishek_Siingh
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PostPosted: Tue Jul 24, 2018 12:07 pm    Post subject: Reply with quote

I think your primary intention is to transfer only axial load to your column but in the model since you have not released the moment in joint A and joint B, the software is taking it as a moment connection. So if you want to transfer moments to the RC column, design the base plate and anchor bolts accordingly.

Wisdom would be to make those joints pinned and release all the moments (rather don't model the RC column at all), so that you can design your column for axial load only. In staad you can give the "MEMBER RELEASE' command .This will lead to higher moments coming in your mid span and you may need to make the mid span section deeper and thicker.But make sure that your RC column base is designed as fixed, else this system will become unstable.

Alternatively, since in the present configuration your column base is pinned, you will have to keep joints A and B as moment joints else there will be instability. If you want you can connect the rafter to the vertical face of the RC column by providing a moment connection there. Then, you can keep your base as pinned. This is the correct way but on paper only. I don't know how many companies actually do it.

I don't know how you achieve fixity at RC column base because there is a divided opinion among engineers whether the isolated footings embedded about 2-2.5 m can be taken as fixed or not. Ideally under low moments they behave as fixed but under heavy moments they do rotate and hence fixity is diluted to partial fixity.


Question to you: Is your column going to support crane(s)?

Hope this helps.

-A
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