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Ram elements - Ram connection load combinations

August 4, 2017, 7:42 am
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I used Ram elements to design a steel column using ASD load combination, the column was passing the design and has adequate capacity to resist the applied loads.

Than I moved to design my baseplate and anchor bolt using ram connection using LRFD method, and I realized that ram connection imported the the load from elements without adding LRFD load combinations.

So I went back and I added LRFD load combinations to my ram elements model, and Imported the loads again to ram connection and design the base connection. But now in ram elements the column that passed the

design using ASD method is NOT passing the LRFD load combination, even though in ram elements I choose the design code to be "AISC-05-ASD". 

Should I ignore that the column is not passing the LRFD load combinations since the design code is "AISC-05-ASD"?

 

 

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Compression and Shear Only Support

August 4, 2017, 1:15 pm
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I am analyzing a concrete ledge beam held against a rock wall with deep rock anchors, tensioned to 100 kips.  The rock wall supports vertical shear forces and compression only, since I cannot depend on bond tensile strength at the rock-concrete interface.  I am looking for advice on modeling the supports at the rock-concrete interface.  Would I model the support as a "spring"?

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Repeating Loads

August 4, 2017, 3:13 pm
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Is there anyway to clear the STAAD model or prevent loads from repeating?

I have the following code:

objOpenSTAAD.Load.CreateNewPrimaryLoad "Wind & Ice X"
For i = 1 To (X)
objOpenSTAAD.Load.AddMemberUniformForce (i), 4, (WindIce), 0, 0, 0
Next i

The first time I run the Excel macro, I want to create and add the respective loads. I have a function that will not create new loads after they've been created, but it keeps adding the same "Wind & Ice" loads to the same nodes each time I run the macro. Is there any way I can have it update when I have new load information or just clear the STAAD model and rebuild everything each time.

For example, in STAAD, in the STAAD Editor, I see this:

LOAD 5 WINDICE
MEMBER LOAD
7 8 UNI GY -2.57439
7 8 UNI GY -2.57439

I don't see a function for this in the OpenSTAAD V8i (SELECTseries4) documentation. So if anyone has an idea, that would be great

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How do we get design forces for a two-way slab in Staad

August 6, 2017, 2:59 am
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Hi,

Can you please tell me how do we get design forces for a two-way slab in staad pro.?

I am not understanding which global axis is the axis for longitudinal and transverse reinforcements for my model. I have read on one wiki page that longitudinal reinforcement is reinforcement calculated based on Mx of the plate element in local plate X-axis. What if all the plate element local axis orientation is not same?

Thank you

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I am confusing about results in modelling one-way slab

August 6, 2017, 3:47 pm
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Hello

I am really confused about results i got for moments about local x and y axes, i modeled one way slab with a ratio equal to 3 (slab length is 9 and slab width is 3), the slab is resting on four edge beams,i subjected 5 kN/m2 on plates using plate load then i run the analyze,, the confusing things  i am getting bigger moment  for My than Mx.

as i know the Mx does not mean moment about the plate local x axis.  It actually means moment on the X face, where the x face is the edge that the local x axis "pokes out of".  It turns out that Mx is actually the moment ABOUT the plate local y axis,

I tried to use floor load option for one way load distribution i got same thing My larger than Mx

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Glass Beam Calculation

August 6, 2017, 8:17 pm
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Dear All

small request, can anyone suggest which type of load can i appy for this type of glass beam as attached (Fin support) of glass- canntilever and full beam.

please suggest and if possible send me staad file of this beam.

also i want to know how can calculate bending moment of this type of beam with panel load and wind load.

(Please visit the site to view this file)regards

hasan

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How to model concrete beam with a large square opening in Staad Pro?

August 7, 2017, 12:23 am
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I need to model a continuous concrete beam of depth 2m with large opening near midspan. The opening is placed eccentrically with respect to depth of the beam as shown in the fig. How to model this?

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Torsional behavior of a structure.

August 7, 2017, 3:45 am
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How i check the staad 3d model for torsional behavior. any body explain ??

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QUICK QUESTION REGARDING STAAD.PRO

August 7, 2017, 3:47 am
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Hi! I'm just wondering so for example for the given structural layout below-- say the length is 5170 mm--this is the length from the middle of the column to the other middle of the column. So it's center to center length. I'm just wondering if in staad-pro when we enter the distance from node to node, is it the distance from the face to face of the column, or center to center?

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Effective length of anchors in RAM connections

August 7, 2017, 5:31 am
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Dear ,

In RAM connections ,base plate type.I have entered the embedded length of the anchor by 220mm but in calculations the effective length = 233mm as in attached please advise me how can I calculate the effective length value .

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STAAD Foundation general questions

August 7, 2017, 7:58 am
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Some colleagues and myself were discussing STAAD Foundation and came up with some questions that we had on mat foundation jobs. 

  • When creating jobs, why does everything need to be at the same elevation? (i.e. piles, columns, mesh all must be located at the same Y elevation). I’m assuming it has to do with the fact that it analyzes things as plates but I’m not sure. I know that you can add pedestals to account for concrete piers or elevated loads. How does STAAD take into account different pile embedment or does it assume everything is based at the middle of the pile cap?
  • When in the “Job Setup” section, is there a way to copy a job that has already been created? Currently I am running the models once with only service loads selected, then running them once again with the ultimate loads selected. Is there a way to have two versions of the same job within the same overall file, without having to re-enter all of the geometry, meshing, piles, etc… like I would have to do if I created a separate job?
  • When STAAD has analyzed the model and I’m in the Slab Designer section, the Result Summary includes a column for Area Req'd. Is this the TOTAL area of steel required in the zone? Or is this the area required per foot of the section? I see that when “Ignore check for minimum reinforcement” is checked, the area required is sometimes lower.

Thank you

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RAM Concept - Wall Reaction Loads

August 7, 2017, 10:35 am
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I'm trying to understand why my wall reaction load for the east wall is so high compared to the south wall? I've run some basic hand calculations and my calculated reaction is about 7 time less than the value shown in RAM Concept. Any thought?

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Warning - Load case is divergent

August 7, 2017, 1:46 pm
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Dears,

Below shows divergent...... how could I fix it?

Thank you.

  4501. * RUN #1A - DIRECT ANALYSIS AND CODE CHECK (WITH P-DELTA)
  4502. *
  4503. ******************************************************************************
  4504. * COLUMN ANALYSIS
  4505. PERFORM DIRECT ANALYSIS ASD

    ** ALL CASES BEING MADE ACTIVE BEFORE RE-ANALYSIS. **
 
   DIRECT ANALYSIS FOR CASE NO.  1001
 
    **WARNING- The load case  1001 is divergent.
 
   DIRECT ANALYSIS FOR CASE NO.  1002
 
    **WARNING- The load case  1002 is divergent.
 
   DIRECT ANALYSIS FOR CASE NO.  2001
 
    **WARNING- The load case  2001 is divergent.
 
   DIRECT ANALYSIS FOR CASE NO.  2002
 
    **WARNING- The load case  2002 is divergent.
 
   DIRECT ANALYSIS FOR CASE NO.  2003
 
    **WARNING- The load case  2003 is divergent.
 
   DIRECT ANALYSIS FOR CASE NO.  2004
 
    **WARNING- The load case  2004 is divergent.

 Can you help me how to fix them?

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Staad Pro

August 7, 2017, 3:55 pm
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I am trying to analyze the steel structure frame which has 4 layers. I am trying to do it in 3D view and having trouble creating layers beneath the layers since the nodes and beams are inter-crossing with each other. I also tried transferring Revit drawing into staad pro but it is creating extra structure members. What is the most efficient way to model the 3D steel frames in staad pro?

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RAM Connection Vertical Bracing

August 8, 2017, 9:52 am
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Where is the option for "Additional Vertical Load" on the vertical brace member?  This was previously an option and allowed the use of Case 2 of the Uniform Force Method to reduce shear demand on the beam connection?

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RAM Connection Seismic Provisions

August 8, 2017, 9:55 am
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When checking the Seismic Provisions option in a CBB Connection the demand in the results output is 0 for all brace-gusset, gusset-beam, and gusset-column interface limit state checks.  Is there a patch or expected fix for this?

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Stop Repeating Loads in OpenSTAAD

August 8, 2017, 11:09 am
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Is there anyway to clear the STAAD model loads or prevent loads from repeating?

I have the following code that runs when I click the button:

objOpenSTAAD.Load.CreateNewPrimaryLoad "Wind & Ice X"
For i = 1 To (X)
objOpenSTAAD.Load.AddMemberUniformForce (i), 4, (WindIce), 0, 0, 0
Next i

The first time I run the Excel macro, this creates and add the respective loads. The second time I run the macro, I want it to only update the existing load and not add another new load to the same beams with the same magnitude and direction. 

Is there any way I can have it only update the loads on the beams when I have new load information (or clear out old loads) or just clear the STAAD model and rebuild everything each time?

For example, in STAAD, in the STAAD Editor, I see this:

LOAD 5 WINDICE
MEMBER LOAD
7 8 UNI GY -2.57439
7 8 UNI GY -2.57439

I want to remove the load repetition. 

I don't see a function for this in the OpenSTAAD V8i (SELECTseries4) documentation that clears STAAD or remove loads. So if anyone has an idea, that would be great

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Illegal Framing Configuration - Cannot find error

August 8, 2017, 12:09 pm
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I have "Illegal Framing Configuration or Missing Slab edge Detected" error but i cannot find or fix error. I have deleted and remodeled slab edge, walls & beam in this area. How do I determine the exact error?

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STAAD Pro SS6 - Composite Deck design example

August 8, 2017, 1:38 pm
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I'm using STAAD Pro SS6 and my building has composite steel beams with a lightweight concrete deck.  The building has a radial (curved) column grid so the beams are not at right angles to each other.  Does this affect the calculation of the composite effective flange width of the beams?  I am getting a lot of warnings stating that "CW of 0.0 Entered".  I didn't enter this value so I'm assuming the program is inputing 0 since the distance between members varies along the length.

I can upload my model if need be.  Does anyone have a good example of a project where the composite deck definition is used correctly? 

Thanks.

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Inconsistencies in deflection checks, DFF, unity ratios?

August 9, 2017, 1:08 am
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Hello,

I'm working on a model and am having some issues with the deflection check. I've attached a picture. So as you can see from the picture, I have a unity ratio of 1.178 under Deflection Clause, in member 36 for LC 603. The beam is 10m long and has DFF of 350 assigned. It's a single line member (i.e. no intermediate nodes in the member and no need for DJ1/DJ2 commands). If I view this member, annotate the deflection it shows deflection 38.916mm. The deflection at the end nodes is 5.294mm and 5.211mm. So the max. local deflection is 38.916 - (5.294 + 5.211)/2 = 33.664mm. Allowable deflection is 10,000/350 = 28.571mm.  33.664 actual / 28.571 allowable = 1.178, which is my unity ratio. So far so good. However, if I go into the Beam window by double clicking on the member, then go to Deflection tab and look at local deflection for LC 603, it shows a maximum deflection of 76.323mm! Why is this so different, and why is it not being picked up in the unity check? Thanks in advance for any answers!

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