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The Vertical force derived from Response spectrum Analysis & Equivalent static Method of Seismic Analysis does not match


Non linear analyses - Kg unchecked

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Dear,

In STAAD Non linear analysis, if Kg is unchecked, how the analysis would perform?

Regards,

Two way slab on top of steel construction

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I have three levels of a 9" slab with perimeter beams on top of steel construction. I am trying to check the size of the steel framing below. The values that RAM FRAME is using is not realistic for the actual loads for steel design. A typical interior column with a bay of 31'x32'-4", based of trib area is around 150 kips per floor in self weight. RAM FRAME shows 150 kips for all three levels. I know FRAME uses finite elements to distribute the loads but, it seems to be way off. Is there a way to get realistic values so i can size the steel and foundations?  

** ERROR: NO MASS IS DEFINED AT FLOOR LEVEL 7.800 METE.

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can you please explain this error?

Instability found --- Check end releases

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I don't understand why I'm getting the "Instability Found for 387 (30.00, 0.00, 1.00) at DOF RX. Check end releases or boundary conditions for these elements: Column 9 at story second......"  error while running concrete analysis in RAM.

RAM Connection reports no checking of gusset plate

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Hi, I am new to ram connection. I created a model with gusset plates for a braced frame, but the results report 0 demand and stress ratio when checking the gusset plate.

 

I appreciate the help anyone can provide.

Multistory Tilt-ups

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In the multistory tilt-up building, if the service displacements are not exceeding the permissible limit (L/150). In that case also do we need to modify the cracked factor in bending for wall panels (which is by default 1)?

Rectangular Concrete Tank with inclined base

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Dear Forum.

I'd like to check if is possible to design in STAAD a concrete Tank with inclined slab at the base, please refer to the image below for reference.

I also have not much experience in mesh modeling, can you please recommend links and information to review to ensure good practices for the modeling and design, Thanks! 


Member Design Failed

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Dear Members,

Please help me to resolve the error for Beam no 55,142

Error - Nominal shear force exceeds tauc_max limit

I already tried by increasing the Grade of concrete, increase cross-section size, increase min and max dia of main and sec reinforcement, but nothing didn't work out.

Pls find attached below model for your reference purpose.

communities.bentley.com/.../Assembly-Hall-Project.std

custom section

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hello guys, i m modeling custom channel with lip section so i have to find out all value like Moi and ixx and iyy torsional, warping area etc . is that any way to import the cad model to get this section properties of all 

2. one d element I assign the property and I want to apply the horizontal and vertical load should i have to change the center of gravity to the origin or staad will automatically take that

Infinity error is coming in the design.

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Dear Communities,

Greetings!

Find the attached updated model with a wide plate beam at a particular location (WPB 700x300x300.1 ). Also find the updated list of the section used in the model for your reference.

 

 

Note:- Please ignore the utilization ratio as 1.02, 1,05. 

In this updated staad model there is not any overstressed member.

 

 

Staad foundation advanced - How to set all parameters to metric unit?

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Hello,

I have an issue to set all parameters in SFA to the metric unit.

I want to design/analyze as ACI318M code and want to see the design output as a metric unit also.

I have tried several ways to set a metric unit such as

• unit set up > choosing SI unit

• change default unit type to SI in the job information

However, the design output is mixed between the English unit and SI unit

Can anyone have a way to resolve this issue?

Thank you in advance.

communities.bentley.com/.../F1.sfa

Are columns in a multi storey( a simple G+5 structure braced or unbraced? I feel that it shoudl be unbraced as there are no such wind resisting elements to specify the columns as braced. Pls offer you comments on this sir.

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Are columns in a multi-storey ( a simple G+5  structure with a portal frame design) braced or unbraced? I feel that it should be unbraced as there is no such wind resisting elements to specify the columns as braced. Pls, offer your comments on this sir. Thanks in advance.

Change in modal story shear

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Hi:

When designing diaphragms for a project, and using ELF, I typically review the change in story shears (in RAM Frame) and multiply the values by the appropriate overstrength factors, where it's needed.  For the same project, and after running a modal analysis, there appears to be a significant shear reversal resulting in large change in story shear values, in one of the stories.  Which procedure is more appropriate for the design of diaphragms?  Consider sign for analysis results is checked under options.

Thank you.

NODE 49 50 AND 51 DOESNOT EXIST WHERE THE STRUCTURE HAS ONLY 48 NODES

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I am getting a warning whenever I perform run analysis. The warning is like JOINTS 49, 50, 51 IS NOT CONNECTED PROPERLY. But my structure has only 48 nodes. Please help!


RAM Structural System/FloorVibe Run-Time Error

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I have an issue in FloorVibe when I try to view or print the report, I get a "Run-time error 76" message and then FloorVibe closes. I'm on a work computer and do not have admin access, but my IT department modified the folder settings to allow similar admin access (similar to the article link below) and the issue is still there. I've done a clean install with RAM and still have the '76' error, I also tried on another computer that was a clean install of windows and RAM and the error is still there. 

https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/31950/run-time-error-when-generating-reports-in-floorvibe

What does the '76' refer to and are there any other steps I can take to reverse the issue? FloorVibe was working at the beginning of last week and then the '76' error showed up. The program still runs, but I can't generate or print reports.

LINEAR LOAD ON PLATE

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Hello,

Is there a way to apply a linear distributed load directly on a plate without having to create a beam with physical properties for the load to be applied?

For example, along the distance of 9,701m shown in the image below.

 

Thanks in advance!

Ignacio

Error in analysis

Error in seismic load

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In seismic load, after selecting IS code and then I click on generate then it's error like 'creation fails ' what to do? 

RC Designer Beam Analysis Issue

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Dear All,

I am designing a beam in RC designer. After getting results, I am only able to see a particular beam main reinforcement details rather than whole beam of that particular member. I have Member M2 which comprises of 4 beams, but I am not able to see the reinforcement details in Tabular format of whole 4 beam. Screenshot is attached below for your reference.

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