program error when adding a "load History" case
Dear Officer:
When I use RAM Concept Edition V8 Update 4, I already defined a load combo. And when I tried to add "final instantaneous load", the program showed "program error" saying "Program Error (load combos must be defined prior to adding a load…
RAM Concept - Load History Steps and Custom Load Combinations Deleting
When using the RAM SS to RAM CONCEPT interaction, our load history steps are reset to default, and our custom load combinations are deleted when we close CONCEPT and come back through the SS dashboard. I've seen on other forum posts that the CONCEPT model…
RAM Concept - Load History Deflections Not Converging
Hi,
I have two RAM Concept suspended slab models which will not converge when running the load history deflections and I am at a loss as too why. Below is the warning provided in the Load History Calc Log:
WARNING: An error has been found while…
RAM Concept Load History Deflections - Eci
Hi there,
When RAM Concept runs load history slab deflection calculation, does it use the initial elastic modulus Eci for initial stages or does it always use E?
For example if I have a load history as the following. Does Concept use Eci for the first…
RE: Ram Concept Load history
Please refer to our Load History wiki and the linked Load History Article
The method we employ is the same regardless what design code you are using, so the user needs to adjust some of the factors like Creep and Shrinkage Restraint to match the local…
RE: RAM Concept Deflection
Start with the information in the manual (Chapter 67 Load History Deflections) and here: The Load History article referenced at the bottom includes more details on the formulae used.
RE: RAM Concept - Flat Plate Torsional Stiffness Reduction
1) For some details about the element stiffness reduction, see program manual section 67.4 Element stiffness adjustments and Accurate Long-Term Deflection Prediction in Flat Slabs Using Linear Elastic Global Analysis , section 3. The stiffness factors…
RE: Creep coefficient Eurocode
The creep model used in Ram Concept for Load History deflections is based on ACI 209R-92. Refer to the program manual section 67.3.2 for some general information.
For further reading see this wiki post:
RAM Concept Load History Calc Options TN …
RE: RAM ECR parameters
A colleague who is more familiar with the AS 3600 code offered this help.
AS 3600 breaks down total shrinkage into autogenous shrinkage and drying shrinkage, whereas Concept only has a single value for shrinkage that represents the combination. I think…
RE: Long Term Deflections for ACI318 in RAM Concept
The L.T. Deflection Plan is no longer a standard plan, since load history deflections are the recommended method for long term deflections. However, you can create a new plan and plot the strip-based L.T. Deflections as follows:
1. Click on the Layers…
RE: Load History Deflections in Concept to British or EU standards
I'm sure lots of engineers have used Concept for this purpose.
I assume you are using Load History analysis.
Alt Envelope factors are not used in Load History analysis, only the standard load (and pattern is used). The program manual, section 67.1…
RE: Incremental Deflections in RAM Concept
Sure, open the last step deflection plan. Then go to the plot options, and for the second edit box, diff layer, select the load history step you want subtracted. Here are some more details: http://communities.bentley.com/other/old_site_member_blogs/bentley_employees…
RE: RAM Concept - Large number of cross sections cannot achieve equilibrium
Take a look at the manual, in the chapter on Load History deflections, section 67.4 "Element stiffness adjustments" (version 6 reference) for details. As noted, this could be a sign of excessive cracking, though more commonly a problematic design strip…
RE: RAM Concept - creep factor according to AS3600
You may find the following web page helpful:
http://communities.bentley.com/products/structural/structural_analysis___design/w/structural_analysis_and_design__wiki/6191.ram-concept-load-history-calc-options-tn.aspx
The ACI 209 creep model is used…
RE: RAM Concept - Deflections Question
Concept models compress nicely as .zip files. Our Secure FIle upload is there for larger files or restricted types.
Load History Analysis is the most complete and accurate for most structures, yes.
RE: RAM Concept Load History Deflections
When the Load history deflection predicts significantly larger deflection than a standard combinations times the creep factor, it's usually a matter of cracking. I use the Service Design - ECR plots to gauge the amount of predicted cracking, and in your…
RAM Concept Load History Deflections
We are currently working on a RC garage model (11” slab thickness, max span ≈34’). We are noticing that our load history deflections are much larger than we are expecting.
When we run load history deflections we get a Final Instantaneous Deflection…