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…

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.

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…

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 …

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…

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…

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…

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…

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…

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…

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.

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…