User Coefficient Seismic Load Pattern

[Alireza.Kord]

Dear All

Any solution for inserting Seismic Load Pattern with C (Base Shear Coefficient) and K (Building height exp.) in ROBOT like what exists in ETABS?

[napooil]

you try at this documentation.

http://help.autodesk.com/view/RSAPRO/2016/ENU/?guid=GUID-C546831A-1E2E-4EEA-8C29-1A082033E16E

[Alireza.Kord]

my problem is how to give C as User-defined base shear coefficient to robot

in the seismic code that im using, V as Building base shear calculated by V=C*W

what is C

C is base shear coefficient that is NOT accordance with ASCE (for this reason I cant use US Code ASCE 7-10 / IBC 2012 in robot) ,so I want to calculate C in the calculator for my building and just give the C to robot and then it obtains V from V=C*W and after calculting the base shear, it distributed over the height of the building in accordance with ASCE

is there any way to do this procedure in robot like what exist in etabs now?

[napooil]

I think.In ARSP can not insert only k value same as your picture.

[mustafahesenow · Accepted solution]

1

[Artur.Kosakowski]

Dear Ak6,

Alternativly to the suggestion from mustafahesenow you may consider defining a combination with coefficient which would scale the bese shear to the expected value or use this option directly in the parameters ogf the seismic case

@mustafahesenow : thank you for helping 

If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.

[napooil]

Thank Mustafa Hesenow.I has concept for seismic force in my country code.

[Alireza.Kord]

so is it true

if I set base shear on user value then robot does not consider s1, sd, ... parameters?

or in another word

when selecting user base shear ,changing S1, Ss, TL, Ie and Cd have no effect on analyse results?

[Artur.Kosakowski]

They have as they determine displacements of a structure which corresponds to the distribution of forces but then the forces are scaled based on the base shear value you demanded. 

If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.

[Anonymous]

I hope this user defined seismic loading can be integrated withing RSAP's next realease. We need this since ASCE41-13

 has a different calculation of base shear than what is in ASCE7-10. Other softwares use the coefficient methods. The work arounds presented here are ok but it will be tedious unlike the coefficient method, because the coefficient is constant regardless of change in horizontal geometry of the bldg. Just what the TS stated, competitors have this.

[Artur.Kosakowski]

Hi @Anonymous

I'm not sure if I understand this correctly. If it is to scale the base shear to the targeted value it is already possible:

As you know W and C then it is W*C which you enter in the above field.

If I managed to answer your question(s) press the Accept as Solution button please. This will help other users to find solution(s) much faster. Thank you.

[Anonymous]

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@Artur.Kosakowski wrote:

Hi @Anonymous

I'm not sure if I understand this correctly. If it is to scale the base shear to the targeted value it is already possible:

As you know W and C then it is W*C which you enter in the above field.

If I managed to answer your question(s) press the Accept as Solution button please. This will help other users to find solution(s) much faster. Thank you.

---

Hello, like what i said, this option is not the same as the competitors. But i think this is acceptable. The user just have to know what is the seismic weight of the bldg, unlike the competitors where the inputs are Cs when you use the user defined seismic loading.

You can take a look at the snapshot of other contributors above. If RSAP can have this, i think it will stream line the user experience from one software to another, hence, potential RSAP users.

[Artur.Kosakowski]

Hi @Anonymous

I'm not an expert in this field however mixing parameters from a different code in the other one I'd personally found a bit confusing. The seismic weight of the structure is easy to see in the results of the modal analysis.

[Anonymous]

The function you stated above is only available when you do dynamic modal analysis. It will not appear if you do only static analysis.