This eSeminar was originally presented on July 30th, 2013
You can view the recording online at our BeConnected site. (coming soon)
The following are the product-related questions and corresponding answers from the eSeminar.
Can I model a structure in RAM Structural System and transfer it to STAAD?
Yes, with ISM you can create a model in one program and transfer that model to the other. This capability is available for the RAM products, STAAD, AECOsim Building Designer, ProStructures, and AutoPIPE, among others, as well as non-Bentley products such as Tekla and Revit. For more information see: http://communities.bentley.com/products/structural/w/structural__wiki/integrated-structural-modeling-home.aspx and: http://www.bentley.com/en-US/Products/Structural+Analysis+and+Design/ISM/
How do you transfer load data from RAM Structural System to STAAD and CSI Software?
Currently only the geometry is transferred from the RAM Structural System to the ISM repository, so once the geometry has then been imported into STAAD it would be necessary to define the loads in STAAD. We intend to implement the transfer of loads in a future enhancement to the ISM capabilities. Note however that gravity beam reactions are transferred through ISM, for use in the creation of the floor plan drawings. Also note that the ability to transfer foundation reactions for use in STAAD Foundation Advanced is currently being implemented. The CSI software does not have the capability of extracting data from an ISM repository.
When you do not accept the updated BIM import, can the originator of the change be notified, or is there always the discrepancy between the two models?
As explained in the webinar, the Structural Synchronizer acts as a “Gatekeeper”, giving the engineer control over whether or not the changes made in one application will be transferred to the other application. If changes are ‘rejected’ the originator of the change is not automatically notified; it is expected that the engineer will communicate those concerns directly with the architect or contractor or whomever made the change, if necessary. Related to that, one feature of the Structural Synchronizer that is particularly powerful is the ability to roll back to any previous version of that ISM repository. Thus if changes were made in error and committed to the ISM model they can be easily removed by rolling back to the previous version of the ISM model.
What if you do not have admin rights on your machine? Is there a way to fully utilize the benefits of the ISM process without having admin rights? Most of our in-house engineers do not have admin rights.
It is not necessary for the engineer to have Admin rights, but the ISM repository must reside in a directory for which they have permission to modify files. This could be the same directory, for example, as where the RAM Structural System models or STAAD models are stored, where they already have permission.
Bentley has other structural analysis programs like LARS and LEAP CONSPAN. Will those programs be able to access ISM?
Although not currently available, the intent is to implement the ISM capability, or something similar, into the Bentley bridge design products, especially LEAP and RM Bridge. Some investigative work has already been done on that.
Where do you download the ISM export for Revit?
Downloads for the ISM Structural Synchronizer and for the ISM Revit plug-in can be found at: http://communities.bentley.com/products/structural/w/structural__wiki/integrated-structural-modeling-home.aspx
Were other team members using other software such as Revit and if so, how was that handled to keep the production moving forward?
The team used Revit. The steel fabricator used their own in-house BIM software. Navisworks was used for the clash detection. There were no notable difficulties with integrating the various models and performing the coordination.
Who is responsible for the BIM model data during the update process, the author of the edit or the recipient of the edited data?
Each discipline was responsible to make modifications to their respective models to incorporate agreed upon modifications emanating from the clash detection process.
Why was RAM Structural System not used for the lateral stability design rather than changing to STAAD.Pro?
The RAM Structural System is special purpose software specifically for buildings. The advantage of this specialization is that it allows building models to be created very quickly, and the analysis and design can be very comprehensive without requiring time-consuming input by the engineer. The disadvantage is that it doesn’t handle some complex geometries such as the curved roofs and curved and non-orthogonal trusses that were prominent in the LAX project. While the RAM Structural System can easily handle even very complicated framing in plan, as well as sloping roofs and sloping columns, the modeling of the curved trusses would have been very tedious; thus it was more productive to use the RAM Structural System for the bulk of the elements in the structure where feasible but to turn to STAAD and other programs where necessary for the more complicated geometries. The RAM Structural System was particularly useful for the design of the composite and noncomposite floor beams, design of the numerous beams with web openings, and in the investigation of the floors for vibration. STAAD was useful in the analysis and design of the complex trusses and for member studies.
Why was SAP 2000 used in the LAX project beside STAAD?
STAAD and SAP 2000 were both used. JAMA decided to use SAP 2000 in cases where we would need to interface with our in-house post-processing programs.
Can you touch on STAAD.Pro on complex framing?
STAAD.Pro is general purpose software, capable of modeling virtually any structural configuration, with a wide variety of elements. It is routinely used in buildings, stadiums, transmission towers, plants, nuclear power plants and containment vessels, as well as dams, culverts, etc. So it has the ability to model, analyze and design complex framing, and is capable of performing advanced analyses.
How were nodal loads (say MEP loads) added to lateral members at different points in RAM Frame?
Gravity point, line and surface loads are modeled in the Modeler by creating a table of loads with their magnitudes and then placing them in their proper location on the floor layout. The loads are then automatically distributed to the gravity and lateral members considering the deck type and direction (one-way or two-way decks). Live Load Reduction where applicable is automatically calculated and applied to the live loads. Wind and seismic loads can be manually defined as nodal loads and assigned to nodes on the frames, or more usefully they can be automatically generated and applied to the frames.
How was diaphragm stiffness correctly modeled in RAM Frame?
For the LAX project, since RAM Frame was not used for the lateral analysis it was not necessary to model the diaphragm in-plane stiffness. However, when performing lateral analysis RAM Frame does offer the engineer several options for specifying the diaphragm stiffness. Here is a very brief explanation. The simplest and most common option is to specify that the diaphragm is “Rigid”; when this option is selected the diaphragm distributes the story forces to the various frame members based on their relative stiffnesses. A more rigorous option is to specify that the diaphragm is “Semi-rigid”; this requires that the engineer specify the diaphragm properties (effective E, thickness, Poisson’s ratio, etc.), the program meshes the diaphragm, and the analysis considers the diaphragm flexibility in the distribution of the lateral forces to the frame members. For both “Rigid” and “Semi-rigid” diaphragms the code requirements for 5% eccentricity for accidental torsion are automatically included if desired. An option unique to RAM Frame is the ability to specify the diaphragm as “Pseudo-Flexible”; for this option the engineer assigns the percent of the story force that is to be distributed to each frame. This is useful in the case of roof diaphragms, for example, that have very little diaphragm stiffness, and these percentages could be based on tributary area or tributary exposure, or whatever the engineer feels is appropriate. The program then uses these percentages to determine and automatically apply nodal loads to the frames.
Is it possible to model cold formed joists back to back in RAM Structural System for 2D floor systems?
Based on the loading, span and design criteria specified by the user, Steel Joists can be selected from tables of sizes (e.g., 16K2 or 40LH16) and Joist Girder labels can be determined (e.g., 24G6N11.2k). The Steel Joist sizes and load capacities are listed in simple tables provided with the program, and can be easily customized. The supplied joist tables do not include doubled up joists, but the tables could be easily modified by the user to include them; it would merely be necessary to include entries in the tables with joist labels indicating double joists (such as 2-16K2), with load capacity values equal to twice those listed for the single joists.
What percentage of the joints was designed by RAM Connection?
JAMA did not use RAM Connection. JAMA has in-house programs for connections.
Does RAM Connection design per the British codes?
Yes, the connection design requirements of BS 5950-1:2000 are included for the design of shear and moment connections, but not for gusset plates (brace connections) or baseplates.
I'm looking for more tutorials for RAM Concept, other than the ones that came with the program. Are there any training services available or additional tutorials?
Bentley offers an extensive set of Live and On-Demand courses for all of its products. Information on these can be found at: http://learn.bentley.com/app/Public
For courses specific to RAM Concept, see: http://learn.bentley.com/app/Public/ViewLearningPathWithMasterCourseExpanded?lpId=100127&mcId=100205
Useful wikis and blogs can be found on the Be Communities website. Search for the product that you are interested in: http://communities.bentley.com
How do we learn more about last year’s Be Inspired Award winner and finalists in the Structural category, and the 2013 event this October in London?
Bentley is proud to have received a number of great use cases for this category. The Innovation in Structural Engineering finalists and winner were outstanding uses of Bentley products for their structural projects. Consider attending the 2013 event in London this October. And consider submitting your innovative project in the Spring of 2014! More information can be found at: www.bentley.com/beinspired.
How do we get Continuing Education Credits? How can I get a certificate of attendance for CEU’s?
Bentley Learning Units (BLU), Bentley Institute’s equivalent to Professional Development Hours (PDH), are granted for the live and recorded eSeminar. Within 2-4 weeks of watching the presentation, Learning Units are added to your transcript. To access your transcript, go to: http://www.bentley.com/en-US/Training/Products/Resources/History/
On the "My Learning History" page, there is a detailed how-to guide related to Learning Units and transcripts, in addition to the link to the user’s online transcript. In most states, users can submit their Bentley transcripts for consideration for continuing education credit toward their registration renewals.
How do I view this eSeminar again or share it with a colleague?
This event along with the live Q&A was recorded, and it is available online. (coming soon)