Bentley Communities

RAM Frame Enhancement Request - Pseudo Flexible Diaphragms

Max Karr

In RAM Frame, when assigning the load percentages for Pseudo Flexible diaphragms it will not recognize a frame number if that frame does not have a column in a particular diaphragm. Can we either get an enhancement to assign a column to multiple frames…
- 28 days ago
- RAM | STAAD | ADINA
- RAM | STAAD Forum
RAM Frame Diaphragm Stiffness Clarification

Zachary Otten

I am working on a structure that has a flooring system of 3/4" concrete board spanning between cold-form metal joists at 16" O.C. The joists span up to 20' between wide-flange moment and braced frames. In an effort to simplify the modeling for this multi…
- over 1 year ago
- RAM | STAAD | ADINA
- RAM | STAAD Forum
Modeling Slopped Roofs and Impacts on Wind Design

Aaron Deaton

Lately I've been running into issues with my lateral analysis on a large, square steel framed building. The roof is an 1-1/2" metal deck that slopes in one direction and drops 10' over the length of the building, which I've modeled as a semirigid diaphragm…
- over 2 years ago
- RAM | STAAD | ADINA
- RAM | STAAD Forum
Diaphragm properties for Laminated Lockwood wood deck

Nik

Could anyone please guide me on the properties that I should input for semi-rigid diaphragm in RAM Structural system, in the decking properties for the Laminated Lockwood wood deck? Effective thickness (in) - ______ Poisson's Ratio - ___________ …
- over 3 years ago
- RAM | STAAD | ADINA
- RAM | STAAD Forum
PDF
Modeling And Analysis of Diaphragms

Allen Adams

This pdf file contains the slides used in the webinar: Modeling and Analysis of Diaphragms.
- ModelingAndAnalysisOfDiaphragms.pdf
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- over 5 years ago
- RAM | STAAD | ADINA
- RAM | STAAD Files
Modeling and Analysis of Diaphragms

Sye

Bentley Success Factors Webinar: Modeling and Analysis of Diaphragms Webinar Q&A Webinar Date: October 2017 Webinar Description Building structure behavior in response to earthquake or wind is heavily dependent upon the nature, extent and stiffness…
- over 1 year ago
- RAM | STAAD | ADINA
- RAM | STAAD | ADINA Wiki
RE: RAM Semi-Rigid Diaphragm Deflected Shape

Seth Guthrie

If it's only for Dynamic Response Spectrum analysis, it's probably a localized sign reversal. You can confirm by checking the forces in the column. More here: communities.bentley.com/.../4029.ram-frame-dynamic-analysis-faq
- over 6 years ago
- RAM | STAAD | ADINA
- RAM | STAAD Forum
RAM Frame - Diaphragm Constraints and Gravity Forces in Shear Walls

Seth Guthrie

Product(s): RAM Structural System Version(s): Any Environment: N/A Area: Analysis While shear walls are primarily a lateral force resisting system they also carry gravity loads including their self-weight…
- 6 months ago
- RAM | STAAD | ADINA
- RAM | STAAD | ADINA Wiki
Lateral Loads on Flexible/None Diaphragms Supported by Gravity Members Only

Seth Guthrie

Applies To Product: RAM Frame Analysis First Affected Version: Found in Version: 15.03.00 Fixed and Released in Version: 15.04.00 Area: Analysis Issue #: 642195 Problem…
- over 6 years ago
- RAM | STAAD | ADINA
- RAM | STAAD | ADINA Wiki
Ram Frame Analysis Log Warnings

Karl G

Applies To Product(s): RAM Structural System Version(s): Any Environment: N/A Area: Analysis Subarea: N/A Original Author: Bentley Technical Support Group …
- over 4 years ago
- RAM | STAAD | ADINA
- RAM | STAAD | ADINA Wiki
RE: Wall Frame Structural System

Seth Guthrie

What you can do in RAM Frame is set the diaphragm type to Pseudo-Flexible and then attribute 25% of the story force to the moment frames and 75% of the force to the walls (loads menu - Pseudo Flexible Diaphragm Properties...). For more tips on pseudo…
- over 7 years ago
- RAM | STAAD | ADINA
- RAM | STAAD Forum
RE: Semi-Ridged Diaphragm With Sloped Roofs (Gables)

Karl G

The diaphragm forces were always calculated for sloping semirigid diaphragms. However, the way that the loads are applied can cause unintended behavior and lead to odd results. See the frequently asked question, " How do sloping semirigid diaphragms affect…
- over 7 years ago
- RAM | STAAD | ADINA
- RAM | STAAD Forum
RE: RAM Frame Negative Change in Frame Shear

Seth Guthrie

We seem to get this kind of question pretty regularly so let me try to address it general terms and if you still need help seeing what's going on in your file send it over (use the Secure File Upload link below). The forces are indeed being redistributed…
- over 7 years ago
- RAM | STAAD | ADINA
- RAM | STAAD Forum
RE: RAM Frame Story Shear with Multiple Diaphragms

Seth Guthrie

When the diaphragm is pseudo-flexible, the location of the graphic for the diaphragm shear is largely irrelevant. This wiki indicates that it's somewhere near the geometric center. If you look at the building story shear report, you'll see 4 lines in…
- over 7 years ago
- RAM | STAAD | ADINA
- RAM | STAAD Forum
RAM Meshing and Segmentation [TN]

Seth Guthrie

Product(s): RAM Frame, Ram Concrete Version(s): 13.00.00.00 or later Environment: N/A Area: Modeling Meshing and Segmentation in RAM Frame or Concrete General Lateral walls, 2-way decks and semi-rigid…
- 3 months ago
- RAM | STAAD | ADINA
- RAM | STAAD | ADINA Wiki
RE: Diaphragm Collector & Chord

Seth Guthrie

There is still no easy way to model and design collector beams or drag struts with RAM Frame. In order to model a drag strut taking axial load, the beam needs to be a lateral member supported by lateral frames (probably with pinned ends). But, even if…
- over 8 years ago
- RAM | STAAD | ADINA
- RAM | STAAD Forum
Example Calculating Semirigid Diaphragm E'

Seth Guthrie

Product(s): RAM Structural System; Ram Frame Version(s): All (V8i; CONNECT Edition) Environment: N/A Area: Analysis See Also RAM Frame - Semirigid Diaphragms
- over 4 years ago
- RAM | STAAD | ADINA
- RAM | STAAD | ADINA Wiki
RAM Frame - Criteria - Diaphragms

Seth Guthrie

Product(s): RAM Structural System; Ram Frame Version(s): All Area: Analysis What diaphragm types are available? The diaphragm options in RAM Frame include: Rigid, Flexible/None, Pseudo-Flexible, and Semirigid. Technical…
- 1 month ago
- RAM | STAAD | ADINA
- RAM | STAAD | ADINA Wiki
RAM Frame - Load Cases

Seth Guthrie

Product(s): RAM Structural System; Ram Frame Version(s): All (V8i; CONNECT Edition) Area: Analysis How do I specify lateral loads? There are two kinds of lateral loads possible in RAM Structural System. The most common…
- over 5 years ago
- RAM | STAAD | ADINA
- RAM | STAAD | ADINA Wiki
RAM Frame Numbers

Seth Guthrie

Product(s): RAM SS; Ram Frame; Ram Modeler Version(s): All (V8i, CONNECT Edition) Environment: All Area: Analysis; Results; Graphics How can I assign Frame Numbers? Frame numbers can be assigned in either…
- over 4 years ago
- RAM | STAAD | ADINA
- RAM | STAAD | ADINA Wiki
RE: Story Drift Results Interpretation

Seth Guthrie

I'm not sure what program you are using or what kind of output, so I'll try to answer in general terms. For any finite element analysis application that uses a rigid diaphragm assumption, the horizontal displacement of the diaphragm can be given at…
- over 8 years ago
- RAM | STAAD | ADINA
- RAM | STAAD Forum
RAM Frame - Masses

Seth Guthrie

Product(s): RAM Structural System; RAM Frame Version(s): Any Environment: N/A Area: Analysis Original Author: Bentley Technical Support Group Why do I get a warning about mass that's not associated…
- over 5 years ago
- RAM | STAAD | ADINA
- RAM | STAAD | ADINA Wiki
RAM Frame - Rigid Diaphragm Constraints and Frame Shear [TN]

Seth Guthrie

Product(s): RAM Structural System; Ram Frame; Ram Elements; STAAD.pro Version(s): Any Area: Analysis Wall stiffness, height and the effect of a diaphragm constraint When a structure consists of walls (or frames) of…
- over 5 years ago
- RAM | STAAD | ADINA
- RAM | STAAD | ADINA Wiki
RAM Frame - Pseudo Flexible Diaphragms [FAQ]

Seth Guthrie

Product(s): RAM Structural System Version(s): Any Environment: N/A Area: Analysis Original Author: Bentley Technical Support Group What are pseudo-flexible diaphragms? Pseudo-flexible diaphragms…
- over 4 years ago
- RAM | STAAD | ADINA
- RAM | STAAD | ADINA Wiki
RAM Frame - Semirigid Diaphragms FAQ

Seth Guthrie

Product(s): RAM Structural System Version(s): 13.00.00.00 or later Area: Analysis Original Author: Bentley Technical Support Group What properties are used with meshed semirigid diaphragms? Semirigid diaphragms…
- 2 months ago
- RAM | STAAD | ADINA
- RAM | STAAD | ADINA Wiki