E P's Communities Activities

Code Checks for Dutch Flats

E P — Tue, 13 Dec 2016 00:59:41 GMT

I am aware that code checks are not carried out for user defined plates.

For this reason I tried to use the pre-loaded Dutch plate/strip profiles, thinking that the program would know it is a flat and use the appropriate section of the code to calculate the code capacity.

However, I ran into problems. One model (it was a complex model) simply crashed if I changed one of the members to a Dutch flat returning "Exception [Unkonown (-529697949)] Raised! Aborting Analysis....."

So I tried a simple model consisting of 3 nodes, 2 supports and a node load applied at midspan. This time the model didn't crash but the figures for the code check seem to be incorrect.

STAAD says the member fails with a utilisation ratio of infinity. This is due to it having a shear capacity of zero (AISC 360-10 ASD):

SHEAR: FORCE: CAPACITY: RATIO: CRITERIA: LOAD CASE: LOCATION(ft):
MAJOR(VZ): 0.001 0.000 Infinity Eq. G2-1 1 0.000
MINOR(VY): 0.001 0.000 Infinity Eq. G2-1 1 0.000
INTERMEDIATE: Aw: Cv: Kv: h/tw: Vn:
MAJOR(VZ): 0.000 0.000 5.000 Infinity 0.000
MINOR(VY): 0.000 0.000 5.000 Infinity 0.000

TORSION: FORCE: CAPACITY: RATIO: CRITERIA: LOAD CASE: LOCATION(ft):
0.000 0.000 Infinity Eq. H3-1 1 0.000
INTERMEDIATE: Fcr: Tn:
0.000 0.000

Is this a hopeless case and I should give up trying to force STAAD to do a code check for plates? Or am I making a silly error somewhere?

Version: 20.07.10.41

Grid Data not Available

E P — Wed, 17 Aug 2016 04:01:21 GMT

I have a pile-support mat foundation which I imported from STAAD into STAAD.foundation.

I specified the mesh and added piles. I ran the analysis.

But when I go to do the design the program returns: "Grid data not available. Design aborted"

Can someone advise why this is and what I need to do to avoid this?

STAAD shear calculation error for AISC 360-10

E P — Fri, 20 Mar 2015 01:22:50 GMT

Hi All,

I have noticed that STAAD incorrectly calculates the shear capacity for a member.

Specifically, it uses a VERY large shear area (overstated by a factor of 2!).

Here is the output for an Australian 250UC72.9:

INTERMEDIATE: Aw: Cv: Kv: h/tw: Vn:
MAJOR(VZ): 7.454 1.000 1.200 8.944 194.597

The depth of a 250UC72.9 is 254 mm and the web thickness is 8.6 mm which yields an area of 2184 mm^2 (3.385 inch^2). STAAD uses 7.454 inch^2 which is 2.2 times larger, causing the final capacity to be similarly overstated.

Is this intended? Has anyone else experienced this problem?