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How to Develop the envelope diagram for selected load cases

August 9, 2018, 11:30 am
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We have a 3 span bridge of 746 ft length, divided into 248, 250 and 248 ft spans . We have generated 120 load cases for HL-93 truck loading along the length of the superstructure with the truck advancing approximately 5ft each time . The axle loading of truck is 32 32 8 kips spaced 14 14 ft .We have also created a lane load of 0.64 kip/ft applied a)over full  Full length ,i.e spans 1 2 and 3  b) in spans 1 and 3 only   and c) in span 2 only. we have also created  load envelopes for the 120 truck load generations separately and another envelope for the 3 lane load cases which you can see in the attached file. 
The problems we are facing are:
1. We are not able to develop/ Plot a ENVELOPE diagram for Each 'load envelope case' separately ( i.e truck load generation and lane load separately)
2. We were wondering how to add/combine these two envelope into one.
can you please help me out to solve the above problems.
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Snow drift magnitude points - Can polygon be rectangle?

August 9, 2018, 2:57 pm
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I am trying to model a simple snow drift load as a rectangle (snow drift on a low roof against a wall with a higher roof) and tried making three points along each side of rectangle - first point for "Drift magnitude 1", second point for "Drift magnitude 2" and "Drift magnitude 3" to correlate to the triangular drift shape as shown in ASCE 7-10, Figure 7-8, page 34.  That made sense to me, but when I run an Integrity/data check, I get an error that says I cannot have collinear points for the M1, M2 and M3 on my drift.

If I go to change the polygon, the "collinear points" error goes away if I do a non-rectangular shape.  However, I also sometimes get an error about a "negative load" value.  The only way I was able to clear the error was to change the polygon to a non-rectangular and irregular shape, which does not comply with the actual shape of the snow drift.

RAM Help (found by doing a search on "drift snow" just says this:  "If a Drift snow load property was selected for this snow load, the Set Drift Magnitude Points dialog appears once the polygon is closed. Select 3 vertices of the snow load polygon to correspond to the 3 magnitude points. When the polygon definition is complete, the new snow load assignment will be made inside the defined polygon."

Please clarify how to set the polygon shape!  

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RAM Concept: Load combinations

August 9, 2018, 3:25 pm
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Hey guys is there a way to copy load combinations? or replicate and then edit them?

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RAM CONCEPT: Changing design strip from no trimming to max shear core changes reinforcing from shear reinforcing bars to bottom reinforcing bars

August 9, 2018, 4:17 pm
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I just joined a new firm and am checking a CONCEPT model. The design strip modeling is not as clean as I would have modeled it, but I'm trying not to have to redo everything and just to focus on certain areas. I have these shear reinforcing bars around the perimeter at slab depression locations. The CS trimming is (by default) off. When I change these strips to Max Shear Core, The shear reinforcing bars disappear, but now there are now (3) #6 bottom bars being added at those locations.

Here's my thinking:

I think that using max shear core for the L-shaped section will trim the top off and give me more shear core cross-sectional area than with no trimming, which means I get more concrete shear capacity and don't need additional shear reinforcing.

What I don't understand is how cross-section trimming is related to flexural stresses. When I check the service level slab bottom stresses at the flexural bar locations, they are higher with the max shear core trimming than with the no trimming option, but I was under the impression that trimming was only related to one way punching check of the shear cores. I have a screen shot of the locations that are in question and uploaded my model. The red circles are related to this question.

The blue circles are also an issue that I haven't been able to figure out and is a bit of a bonus question. At some iteration of this slab model, jacks were added in the middle of the slab and, since then these two bottom bars (circled in blue) appeared. Is there a reason that these should suddenly show up?

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STAAD Geometry gets automatically disturbed

August 9, 2018, 11:47 pm
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I have created a STAAD model which is imported from an .stp file. Anlaysis and Design went well initially, but now when i try to make any changes to the model like change in loads or geometry, i cannot run the file. It gives me weird errors and the geometry of the structure gets disturbed. It merges nodes automatically, modifies the applied loads to zero value etc.

I have tried reinstalling STAAD twice with the latest version. I am having Select series 6; Build 20.07.11.90. I have tried running the same file on other computers but it works fine there. I tried modifying other STAAD models on my PC and it behaves the same. Just cant figure out what to do. Is anyone facing similar problem?

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bending moment and shear force

August 10, 2018, 2:24 am
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In staad analysis there is change in the moment and shear by changing the value of Modulus of Elasticity for box type structure modeled with spring support.

Member property are rectangular concrete section.

Value of Moment and shear increase with increase in modulus of Elasticity.

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I am facing a problem again and again whenever doing the analysis part, load may have lost error occers every time, kindly help

August 10, 2018, 2:37 am
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STAAD Pro - Brazilian code Support

August 10, 2018, 4:48 am
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Hi,

Will STAAD.Pro support design of Steel and concrete structures as per Brazilian codes?

NBR 6118

Design of Structural Concrete - Procedure

NBR 8800/08

Steel and Composite Structures Design for Buildings

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In the two way slab, the prototype cannot transfered into staad pro by using run structure wizard in geometry

August 10, 2018, 5:08 am
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Detailed design steel SNiP

August 10, 2018, 6:18 am
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Hi, everybody. I try to design Steel construction in Staad Pro advanced connect edition. But I have only utilization ratio - output report. When I choose Russian SNip code for steel I do not receive detail design output.

What I must do for full detail design output.  Thanks .  Katarina

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Manually set Camber?

August 10, 2018, 1:32 pm
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I'm analyzing an existing building given the structural drawings. I can manually set the number of studs for each beam, but can I also manually select the amount of camber?

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Please do check my design (steel design parameters specially)

August 10, 2018, 10:41 pm
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Dear sir,

Greetings!!

Please help me out from this as i am design a peb structure in staad pro its showing fail on 16 mm of web and flange thickness, but my seniors are saying (as per their experience basis only) that the column and rafter will be only on 8 mm web and 10 mm flanges, how its possible 

please help me out and please check my model and make my correct my mistake in the design !!

and specially please check the parameters "Ly, Lz, UNT & UNB

thanks in advance !!

STAAD PLANE
START JOB INFORMATION
ENGINEER DATE 09-Aug-18
END JOB INFORMATION
INPUT WIDTH 79
UNIT METER KN
JOINT COORDINATES
1 0 0 0; 2 0 10 0; 3 50.3 0 0; 4 50.3 10 0; 6 25.15 14.7 0; 7 6.2875 11.175 0;
8 12.575 12.35 0; 9 18.8625 13.525 0; 10 31.4375 13.525 0; 11 37.725 12.35 0;
12 44.0125 11.175 0;
MEMBER INCIDENCES
1 1 2; 4 3 4; 5 2 7; 6 6 10; 7 7 8; 8 8 9; 9 9 6; 10 10 11; 11 11 12; 12 12 4;
DEFINE MATERIAL START
ISOTROPIC STEEL
E 2.05e+008
POISSON 0.3
DENSITY 76.8195
ALPHA 1.2e-005
DAMP 0.03
TYPE STEEL
STRENGTH FY 253200 FU 407800 RY 1.5 RT 1.2
END DEFINE MATERIAL
MEMBER PROPERTY AMERICAN
1 4 TAPERED 0.7 0.016 0.7 0.25 0.025 0.25 0.025
5 6 TAPERED 0.8 0.016 0.6 0.25 0.016 0.25 0.016
7 8 10 11 TAPERED 0.6 0.016 0.6 0.25 0.016 0.25 0.016
9 12 TAPERED 0.6 0.016 0.8 0.25 0.016 0.25 0.016
CONSTANTS
MATERIAL STEEL ALL
SUPPORTS
1 3 PINNED
DEFINE 1893 LOAD
ZONE 0.24 RF 4 I 1 SS 2 ST 1 DM 2
SELFWEIGHT 1
MEMBER WEIGHT
1 4 TO 12 UNI 0.87
LOAD 1 LOADTYPE Seismic TITLE eq
1893 LOAD X 1
LOAD 2 LOADTYPE Dead TITLE d.l
SELFWEIGHT Y -1 LIST ALL
MEMBER LOAD
1 4 TO 12 UNI GY -0.87
LOAD 3 LOADTYPE Wind TITLE wl 1
MEMBER LOAD
1 UNI GX 7.3
5 7 TO 9 UNI Y 5.68
6 10 TO 12 UNI Y 3.24
LOAD 4 LOADTYPE Wind TITLE wl 2
MEMBER LOAD
1 UNI GX 4.06
5 7 TO 9 UNI Y 8.921
6 10 TO 12 UNI Y 6.49
4 UNI GX 3.24
LOAD 5 LOADTYPE Wind TITLE wl3
MEMBER LOAD
1 UNI GX -5.68
5 7 TO 9 UNI Y 8.92
6 10 TO 12 UNI Y 6.49
4 UNI GX 5.68
LOAD 6 LOADTYPE Wind TITLE wl4
MEMBER LOAD
1 UNI GX -2.43
5 7 TO 9 UNI Y 5.68
6 10 TO 12 UNI Y 3.24
LOAD COMB 7 Generated AISC GENERAL 1
2 1.0
LOAD COMB 8 Generated AISC GENERAL 2
2 1.0 3 1.0
LOAD COMB 9 Generated AISC GENERAL 3
2 1.0 4 1.0
LOAD COMB 10 Generated AISC GENERAL 4
2 1.0 5 1.0
LOAD COMB 11 Generated AISC GENERAL 5
2 1.0 6 1.0
LOAD COMB 12 Generated AISC GENERAL 6
2 1.0 1 0.7
LOAD COMB 13 Generated AISC GENERAL 7
2 1.0 1 -0.7
LOAD COMB 14 Generated AISC GENERAL 8
2 1.0 3 0.75
LOAD COMB 15 Generated AISC GENERAL 9
2 1.0 4 0.75
LOAD COMB 16 Generated AISC GENERAL 10
2 1.0 5 0.75
LOAD COMB 17 Generated AISC GENERAL 11
2 1.0 6 0.75
LOAD COMB 18 Generated AISC GENERAL 12
2 1.0 1 0.525
LOAD COMB 19 Generated AISC GENERAL 13
2 1.0 1 -0.525
LOAD COMB 20 Generated AISC GENERAL 14
2 0.6 3 1.0
LOAD COMB 21 Generated AISC GENERAL 15
2 0.6 4 1.0
LOAD COMB 22 Generated AISC GENERAL 16
2 0.6 5 1.0
LOAD COMB 23 Generated AISC GENERAL 17
2 0.6 6 1.0
LOAD COMB 24 Generated AISC GENERAL 18
2 0.6 1 0.7
LOAD COMB 25 Generated AISC GENERAL 19
2 0.6 1 -0.7
PERFORM ANALYSIS PRINT ALL
PARAMETER 1
CODE AISC
FYLD 250000 ALL
LY 1.5 MEMB 5 TO 12
LZ 50.3 MEMB 5 TO 12
UNB 1.5 MEMB 5 TO 12
UNT 1.5 MEMB 5 TO 12
CHECK CODE ALL
PARAMETER 2
CODE AISC
STEEL MEMBER TAKE OFF LIST ALL
FINISH

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Clever Analyses

August 11, 2018, 3:28 pm
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Hi 

Can someone provide pdf tutorials for advanced modelling and analyses issues. for example, in the past i know someone put tubular modelling example using plates. also someone published base plate including stanchion and stiffeners modelling example.

many thanks.

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while designing facade glazing glass structure. i modelled glass as plate element .i applied wind load on glass plate as plate pressure. but when i checked the stress in glass after analysis it is found to be zero stress. how to do

August 11, 2018, 7:17 pm
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how to make this type of aluminium section transom and mullion in staad pro. image attached below

August 11, 2018, 7:21 pm
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How I can model a cantilever beam with built up channel section arranged face to face and also the distance between these channel sections are varying in staad pro

August 11, 2018, 10:01 pm
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*WARNING- NO MEMBERS LOADED FOR A WIND LOAD GENERATION.

August 12, 2018, 5:27 am
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*WARNING- NO MEMBERS LOADED FOR A WIND LOAD GENERATION

I tried finding anything regarding this warning in the output viewer but found nothing. What could cause this warning to show up? I reviewed the applied wind load and everything looks normal. I have this warning repeated 4 times at different lines of the input.

File attached.

Thanks.

communities.bentley.com/.../RESIDENTIAL-BUILDING-23.std

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STAAD Advanced Concrete Design RCDC (English) 32-bit - not possible to run the application for instalation

August 11, 2018, 1:28 am
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I have downloaded the STAAD Advanced Concrete Design RCDC. I am using 64 bit system.

When I run the application as an administer, I got the main screen without any installation option (shown below)

Kindly do the needful

Thanks and Regards

Praveen

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STAAD Foundation Advanced Steel Layers

August 13, 2018, 3:12 am
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I am designing a mat slab.

The slab Designer dialogue box allows me to set the top cover and bottom cover.  Does the longitudinal or transverse reinforcing have the least cover?

Are layers 1 & 4 always in the longitudinal direction?

Does SFA allow for the reduced capacity of layers 2 & 3 as they have a smaller lever arm (i.e. d2 < d1)?

Would like a quick response as this is my first time using the software and want to know I detail this correctly on a project please.

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Why all the members getting failed, though I am giving all the reinforcement properties

August 13, 2018, 4:19 am
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