Customization of Standard Database: Part 2- Custom Cold-formed Section Design|| Z-purlin/Hat Section
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- เผยแพร่เมื่อ 16 ต.ค. 2024
- For any cold-formed steel structure, it is often required to use a custom section which is not available in the standard database. Design of UPT or user table section is not possible using any cold-formed design code including IS801 code. To design any user defined cold-formed section, we need to add that custom section in STAAD cold-formed database.
In this video, I have discussed about the cold-formed codes and section catalogues available in STAAD and how to add a new cold-formed section in the standard database. Also I have discussed how to calculate the properties of custom section easily using section builder and free sketch mode.
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Dear Sir, Thank you for the detailed video, I have 2 questions here, I am a Solar Structural Engineer:-
1.) Can we import the dwf of the customized section with fillet also added from Autocad, or shall we give the fillet radius in the staad pro itself?
2.) For HAT purlins, I am getting errors while trying to add a customized Trapezoidal section to the Staad, could you please provide a reference sheet on what values need to be added at what place for HAT Trapezoidal profile sections in Staad?
I really appreciate any help you can provide.
1. You can import any drawing file as a section in the Free Sketch mode which is a part of Section Wizard, including the outline of the section and root/toe radius.
2. Open the section database manager, check the standard hat profiles. Whatever value is reported in the property table, you need to specify all those values for the new section.
@@surojit_ghosh Sir,Thanks for the reply,
Further request to answer 2 more questions: -
1.) HAT sections generally used for solar structures are trapezoidal in shape, we know, we can analyze the same in Staad Pro, does staad pro also design the trapezoidal shape of the HAT profile or shall we only include the perpendicular shape HAT sections (of Equivalent weight) as present in IS811 code?
2.) Can we analyze random sections in Staad Pro as cold deformed sections, and get its designed results?
I really appreciate any help you can provide.
how to add bulb flat to data base?
actually, the bulb flat already exists on European data base manager but not appear when I check on section data base.
Thank you for the valuable information.
Would you please help me with adding a (designable) cold formed section that's not similar to the database. Some of my cold formed sections are imported from China and have a weird channel-like shape. What would be the correct method to add such sections?
Design of custom shape cold formed section is not possible. One alternative is to find the equivalent section properties considering any close standard shape (say, channel section or channel with lips), then add that property in the standard cold formed database under that category. With this approach, you can design that section.
@@surojit_ghosh Thank you very much for your reply!
Helpful video...... .... Is it possible to design whole cfs load bearing structure in staad.... if possible do make some videos in it
Yes, you can use IS801 code to design any cold formed section in STAAD, for any structure.
This video helped me alot.When importing a dxf file in Staad,the dxf units must be the same as Staad units?if my dxf file was in mm dimension,while staad unit is in m dimension will it be a wrong approach?
Please upload another video which shows how to convert custom sections into equivalent section and also how to design purlin considering sag rod effects
When we import any dxf file in Section builder, we can select the unit system. So if the base unit of STAAD is in meter unit and the dxf is created using mm or inch unit, then we can select that from import dialog, and program internally converts the unit to STAAD unit system (meter in this case).
Hi sir, I used this cold rolled steels for solar structures. What is the Yeild strength of this cold rolled steels, I applied in Staad pro?
Because we uses the base material as GI sheet, in that case when the coating of GI increases, the Yeild strength will increased . That's y I ask the doubt sir, kindly guide me. Thank you sir
Yield strength is normally supplied by the vendor if you are using some custom materials or sheets. Whatever value is provided by your material supplier, you can use that value in STAAD as a design input (FYLD parameter) and also you can specify the same in material properties by editing the existing yield strength value. By default, 353MPa is considered as yield strength during design using IS801 code in STAAD. It normally ranges between 350-400 but you should check before specifying.
In addition to this, you can also consider the cold work forming strengthening effect as suggested in IS:801-1975, under cl.6.1.1. In STAAD, you can specify CWY parameter as 1 to consider this during yield strength calculation.
How to assign double channel back to back, please guide me
Dear sir
I was trying to add Indian cold form member 80CS40X0.8 in section data base and putting all value but when i am analysis with IS801 there is showing error Iy and Iz value missing. Please how to rectify it.
It seems that these values are missing for this section. When you add a section in database, 3 property values are mandatory - AX, IY and IZ. These three are required for both analysis and design. For your case, somehow program is unable to get these values for the assigned section. From section database table, first check whether these values are available or not and also if the values are in correctly specified (check unit system). Also you can use print member properties command and check the values from the output file.
@@surojit_ghosh sir,I put the values of Iy and Iz but when I close data base window automatically it removes the software and putting 0 value.
Have you saved the values using Commit option? Once you specify the values in the section database manager, use the commit option to save the values and then cross check the values from the section database property table. If the problem still exists, then there might be some problem with your STAAD version. In such case, post your query in the BE Communities site along with the version number and section details.
@@surojit_ghosh Yes sir I saved with commit option but steel facing problem using version 22.08.00.175 staad connect edition.one thing also,I have put only B,D,T AND Iy and Iz and rest of the values putting zero as you elaborate in video. can you tell me which values are mandatory.
Could you help me, in my staad connected addition there is no 801 IS code
Not sure which version of STAAD.Pro you are using. Few years back, this code was removed from STAAD, but it is now available, use any latest version.
I applied ur custom cold formed steel design method using IS 801 code.
I input all the data in section database.
After applying the custom section in Staad model, I just double click it to check the dimensions, in the dialogue box that custom section dimensions was changed automatically. (Ex: I enter the dimensions of C with lip 80x40x15x2 , but after check it, it shows very less dimensions)
I followed ur video step by step and applied all the procedures correctly.
Kindly guide me sir
I used staad Pro connect edition V22 update 4
I've sent the Screenshots in ur LinkedIn Inbox
Hi Siva, there might be two reasons for this.
First, the section information might not be saved correctly in the standard section database. To check this, in the section property page for channel with lips, click on the "View Table" option and check whether the dimensions are correctly reported in the table or not.
Second, in the member query box, the unit setup might be different. You have specified the channel dimensions in mm unit and it might be reported in the member query box in inch unit (the value is also very close after conversion). From the unit setup, check the dimension unit and if it is in inch, change it to mm or meter.
@@surojit_ghosh thank you sir, I'll check the units and
kindly upload the solar structure webinar video sir
Hi sir,I used lattice framework structure type for wind speed analysis for solar structures. Is that correct method to analyse the solar structures against wind. If I am doing wrong, kindly guide me sir. Thank you
Hi Siva, in IS875 (Part 3): 2015, nothing is clearly mentioned about solar mounting structures. But if you consider cl.7.3.3.3, this provides some idea how to calculate the pressure coefficient for free standing structures. I normally use table 8 (mono slope free roof) for the wind load calculation on solar mounting structures. You can use lattice tower rules but as the solar structure height is very small and limited to a single intensity gradient, that will not replicate accurate results. Also considering it as a tower structure, you are neglecting the effects of solar panels which is not correct.
This month I will deliver a webinar on solar structure modelling where I will discuss about this. You can check the Bentley Event page for more details about this webinar or wait for few weeks, I will upload the video in my channel after the webinar.
Thank you sir, kindly upload the webinar video
Very useful....
thankyou so much
Welcome, Nilesh. Keep watching.
Could you please upload cantilever z purlin design
Sir can you tell me how to calculate safety factor of a cold formed section in terms of moment
I am not sure whether I am able to get your point properly. Normally the safety factor is suggested in the relevant design code and that also depends on load cases. Not sure which cold formed design code you are following. In general, for any steel structure, we don't allow actual force to be very close or equal to the allowable capacity value. You can consider 5-10% reserve capacity which is considered as a good practice in the industry.
There are several other factors also like importance of the structure, how crucial is the member for structural stability etc.
How we can do connection design for cold formed steel structure
At this moment, there is no option available to automate the connection design for cold formed sections. For hot rolled section, we can reuse the structural data (geometry, release info, end forces) for connection design using integrated connection design module of STAAD. But this module does not design connections for cold formed sections.
One alternative, use some custom templates. I will try to cover this in detail later.
@@surojit_ghosh ok sir. Thanks a lot
@@surojit_ghosh when will this be posted i keep on waiting
nice
Thanks