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santoshab
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Joined: 07 Dec 2008
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Location: Bangalore
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 Posted: Sun Apr 19, 2009 3:37 pmPost subject: column design in staad |
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Dear Sefians,
PFA the output of a column member designed in staad pro. The total design moment in Y-direction is 65.90 kN-m. I am not getting how the total is made it should be initial moment + moment due to ecc.( if applicable) + add moment due to slenderness = 39.54 + 4.74 = 44.28 kN-m whereas in staad it is taking as 65.90 which is where I am lost. Kindly someone can help me to get an insight in to this
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| Staad output of column design |
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Last edited by santoshab on Mon Apr 20, 2009 4:42 pm; edited 1 time in total |
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1user(s) is/are thankful for this post.vikrant nair(22-04, 20:59), Thanks santoshab for his/her post
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sdec.in
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Joined: 26 Jan 2003
Posts: 473
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| Posted: Mon Apr 20, 2009 5:48 amPost subject: column design in staad |
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Maybe it's increased after a Load factor of 1.2 or 1.5 has been applied to the DL and LL etc.....
| Quote: |
----- Original Message -----
From:mr.despande (forum@www.buonovino.com)
To:general@www.buonovino.com(general@www.buonovino.com)
Sent:2009年4月19日9:07
Subject:[SEFI] column design in staad
Dear Sefians,
PFA the output of a column member designed in staad pro. The total design moment in Y-direction is 65.90 kN-m. I am not getting how the total is made it should be initial moment + moment due to ecc. + add moment due to slenderness = 39.54 + 4.22 + 4.74 = 48.5 whereas in staad it is taking as 65.90 which is where I am lost. Kindly someone can help me to get an insight in to this
Download Attachments:
Staad output of column design
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santoshab
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Joined: 07 Dec 2008
Posts: 97
Location: Bangalore
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| Posted: Mon Apr 20, 2009 4:37 pmPost subject: |
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Dear sedc.in,
我怕我ts not the case of factor, if it were then it has to be valid for major direction moment also. Also if you see it is displaying Pu and also the load case is 8 which is 1.5(DL+LL) so according to me it has to be Muz and Muy only what it is displaying.
Has anyone faced the same problem? |
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PSRaju
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Joined: 02 Jun 2008
Posts: 92
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| Posted: Tue Apr 21, 2009 5:37 amPost subject: column design in staad |
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Dear mr.despande,
This is the first time I noticed. But Staad Results are varying especially concrete design depending upon the Staad Pro version after 2004. If you can mail the Staad Input File I can check in 2004 and 2006 versions and get back to you. My mail id isma_srinu@yahoo.com
Raju
| mr.despande wrote: |
Dear sedc.in,
我怕我ts not the case of factor, if it were then it has to be valid for major direction moment also. Also if you see it is displaying Pu and also the load case is 8 which is 1.5(DL+LL) so according to me it has to be Muz and Muy only what it is displaying.
Has anyone faced the same problem? |
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ibarua
General Sponsor
Joined: 26 Jan 2003
Posts: 1039
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| Posted: Tue Apr 21, 2009 2:53 pmPost subject: column design in staad |
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21/4/2009
Have you accounted for moment due to seismic /wind forces?
Indrajit Barua.
On Sun, 19 Apr 2009 mr.despande wrote :
| Quote: |
Dear Sefians,
PFA the output of a column member designed in staad
pro. The total design moment in Y-direction is 65.90
kN-m. I am not getting how the total is made it should
be initial moment + moment due to ecc. + add moment due
to slenderness = 39.54 + 4.22 + 4.74 = 48.5 whereas in
staad it is taking as 65.90 which is where I am lost.
Kindly someone can help me to get an insight in to this
Attachments:
//www.buonovino.com/forum/files/staad_789.zip
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santoshab
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Joined: 07 Dec 2008
Posts: 97
Location: Bangalore
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| 发布:2009年四月21日四11点Post subject: |
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Dear ibarua sir,
I have applied the load combination's. I am not sure what is possible reason for this error. This type of error is only noticed when it is adding the slenderness moment.
I am attaching the staad model.
Kindly guide me.
Regards,
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rev4 off.zip |
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PSRaju
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Joined: 02 Jun 2008
Posts: 92
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| Posted: Wed Apr 22, 2009 1:27 pmPost subject: column design in staad |
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Dear mr.despande,
Seems to be there is mistake in the Staad software. You can verify the member end forces for the guiding load case and compare with the Total Design Moments. Both are same. It is showing the moments for slenderness, but it is not accounted for in the design. It is simply designing the column for the final moments as per the member end forces only. You may refer this mistake to M/s Bently Systems for rectification.
Raju
| mr.despande wrote: |
Dear ibarua sir,
I have applied the load combination's. I am not sure what is possible reason for this error. This type of error is only noticed when it is adding the slenderness moment.
I am attaching the staad model.
Kindly guide me.
Regards, |
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PSRaju
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Joined: 02 Jun 2008
Posts: 92
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| Posted: Thu Apr 23, 2009 6:04 amPost subject: column design in staad |
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Dear mr.despande,
The enclosed document will explain in detail how Staad is designing the column in the newer versions. It is not considering the slenderness moments for design of columns. You have to design the column with the help of SP 16. The analysis results are also not same when compared with the older versions.
Raju
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Staad design.zip |
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santoshab
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Joined: 07 Dec 2008
Posts: 97
Location: Bangalore
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| Posted: Thu Apr 23, 2009 9:48 amPost subject: Re: column design in staad |
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Dear srinu.
Yes you are right I also observed the same thing. It is not considering slenderness moment for design.
Thanks for clarification.
But you also made a comment regarding analysis. I am bit hesitant about it, kindly give your comments on it. Not sure how the analysis result can vary?
| ma_srinu wrote: |
Dear mr.despande,
The analysis results are also not same when compared with the older versions.
Raju |
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va
E-Conference Moderator
Joined: 26 Jan 2003
Posts: 89
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| Posted: Thu Apr 23, 2009 12:53 pmPost subject: column design in staad |
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Dear Raju,
Which version of STAADpro you are using? Generally, STAAD takes in to account the slenderness moments in column design. You can report your query to support team. They will guide you.
With thanks and regards.
For VADALKAR & Associates
Hemant Vadalkar
Consulting Engineer
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Vadalkar & Associates
B-703, New Samadhan CHS, Senapati Bapat Rd., Opp. Dadar Stn(W), Mumbai-400 028 India. ( Near Zarapkar)
Tel 022-2430 8872 Cell +91-93225 32578
Email :vadalkar@gmail.com(vadalkar@gmail.com) Website :www.vadalkar.com
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| Quote: |
----- Original Message -----
From:ma_srinu (forum@www.buonovino.com)
To:general@www.buonovino.com(general@www.buonovino.com)
Sent:Thursday, April 23, 2009 11:34 AM
Subject:[SEFI] Re: column design in staad
Dear mr.despande,
The enclosed document will explain in detail how Staad is designing the column in the newer versions. It is not considering the slenderness moments for design of columns. You have to design the column with the help of SP 16. The analysis results are also not same when compared with the older versions.
Raju
Download Attachments:
Staad design.zip
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