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  • 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…
  • Deflection Checks in RAM Concept

    A deflection check feature that allows users to check deflection limits during the design calculations was added in RAM Conce pt Version 8 Update 4. This article describes how to use this new program feature. Defining Deflection Checks and Deflection…
  • 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…
  • External Shrinkage Restraint for Multi-Story Concrete Structures

    Product(s): RAM Concept Version(s): 4 or greater Environment: N/A Area: Analysis In the load history deflection calculations, RAM Concept separates internal restraint of shrinkage (due to reinforcement…
  • zRAM Concept Load History Calc Options (Versions Prior to Version 8 Update 2)

    Applies To Product(s): RAM Concept Version(s): Various Area: Analysis Load History Parameters in RAM Concept RAM Concept uses the ACI 209R-92 models for creep and shrinkage. In these models, only modifications…
  • RAM Concept Load History Deflection Analysis Results Table

    RAM Concept’s load history deflection calculations are complex due to the many non-linear behaviors that are considered (see Load History Deflection Calculations for more information). When unexpected results are obtained, it can be difficult to verify…
  • RAM Concept Load History Deflection Calculations

    Long-term concrete deflections are difficult to predict due to the influence of several non-linear behaviors that complicate the calculations. Historically, design engineers have relied on approximate methods, like deflection multipliers, to simplify…
  • RAM Concept CONNECT Edition V8 Update 2 Release Notes

    Release Date: January 2021 Version: RAM Conce pt CONNECT Edition V8 Update 2 Version Number: 08.02.00.146 Download and Installation Instructions Current and past RAM Conce pt releases can be downloaded from the Bentley Software Downloads page…
  • RC Two-way Slab Long-term Deflection

    Hi all, I'm studying a two-way RC flat slab for a parking garage. 10" thick, 6000psi concrete, 10psf SDL and 40psf LL. The 5000-day deflection is 3" under 1.0SW+1.0SDL+0.25LL for a 30'X27' interior bay. With the same geometry and concrete strength…
  • 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…
  • RAM Concept CONNECT Edition V7 CL Release Notes

    Release Date: December 2018 Version: RAM Conce pt CONNECT Edition V7 Version Number: 07.00.00.12 Download Instructions Current and past RAM Conce pt releases can be downloaded from Bentley Cloud Services at: http://connect.bentley.com After…
  • zLoad History Parameters and AS 3600

    ***Note - The AS 3600-2018 Creep and Shrinkage Models were added in RAM Concept Version 8 Update 2. The information and recommendations on this page do not apply to that implemented creep and shrinkage model. We recommend updating to that version (or…
  • 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…
  • Ram Concept Load History Deflections Unexpected Behavior

    Product(s): RAM Concept Version(s): 4 or greater Environment: N/A Area: Analysis Original Author: Bentley Technical Support Group Why does the load history deflection increase when reinforcement…