Shear Wall Results 1

[structech08]

Hi ETABS USERs,

1.0 When we assign shear wall as pier or spandrel, then we let ETABS design the shear wall, in the output for the pier gives shear reinforcement, it gives shear value say 4022 sq mm, wall thickness is 600 mm, shall we divide the area by 2 (2011 sq mm, 16mm dia @ 100 o/c each face) or put all the 4022 sq mm in each face, say 16 mm dia @ 50 mm o/c.

2. Where can we find in etabs help or manual the distribution of shear wall rebars results to sustantiate item 1?

Thanks,
structech08

 

[slickdeals]

Why don't you use the Vu from the spandrel design and compute how you want to provide the shear reinforcing?

 

[structech08]

Hi slickdeals,

Yes that could be one option, but I just want to use results given by etabs for prelim. Refering to the original question, what shall we do?

Thank you,
Structech08

 

[Murali27]

Hi Structech08

1a) Pier design: The shear reinforcement reported in the design is total reinforcement (for wall, it is total horizontal steel).

1b) Spandrel design: The shear reinforcement reported in the design is total reinforcement (for wall beam/beam, it is total vertical steel,i.e., shear links).


2) It should be there in shear wall design document, ETABS manual

Hope this helps

Cheers
Murali27

 

[structech08]

Hello Murali27,

Thank you so much for your reply.

It is a big help!

Regards,

structech08

 

[dcStrucEng]

I have a follow-up question to structech08's question:

Does ETABS calculate the shear reinforcing in piers as straight bars or as hooked bars (open or closed)? I couldn't find this information in any ETABS manual or technical notes.

My concern is that if ETABS requires a large amount of shear reinforcing in piers, I don't want to specify large bars (#6 or higher) that would be more difficult and more expensive to bend. So I'd prefer to keep shear bars at #5 or smaller.

However, if ETABS assumes shear bars to be straight, then I'd specify larger bars with greater spacing.

I hope someone out there knows. Thanks.

dcStrucEng

 

[zeemas]

Shear reinforcment is not specified in ETABS, ETABS will give you Av/S number and you have to calculate manually.

 

[slickdeals]

Remember ETABS is only a analysis tool, not a detailing package. ETABS calculates Av, it does not care whether the bar is straight or hooked. Av is Av.

It is up to you to detail the shear reinforcing required by properly anchoring it in the compression zone.

 

[StructGen]

In order to use shear reinf. provided by Etabs, you have to provide complete hook, in other words the total length of provided shear-rebar has to work in shear, this could be achieved by placing a U-bar at each end of shearwall and splicing it with straight bar.