• Ram Frame Analysis Log Warnings

    Applies To Product(s): RAM Structural System Version(s): Any Environment: N/A Area: Analysis Subarea: N/A Original Author: Bentley Technical Support Group …

  • RE: STAAD Pro. Composite Deck vs Diaphragm Action

    A composite deck is not equivalent to defining a rigid diaphragm. It assigns the composite properties to the beams based on the effective width of the slab. However it does not make the floor completely rigid. It also does not account for the torsion…

  • RE: Wall Frame Structural System

    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…

  • RE: Semi-Ridged Diaphragm With Sloped Roofs (Gables)

    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…

  • How to model Property for Structural Roof Deck Diaphragm

    I am trying to accurately model a gable roof with a structural metal roof deck that acts as a diaphragm. Ultimately, I'd like to take forces from my STAAD model to design the structural metal roof deck diaphragm. I only want to consider metal roof deck…

  • RE: Modeling Roof and Floor Diaphragms in Staad Pro V 8i

    Here are the answers to the questions 1. A steel roof deck without concrete filling or a checkered plate floor are usually not considered as rigid diaphragm and so using master slave ZX will not be appropriate. If you would just want the loading on…

  • I am receiving errors. "...floor diaphragm is present in the model. Wind Load definition should be defined after Floor Diaphragm definition..."

    I am having so many error and warnings everytime I run analysis.. PLEASE HELP ME... 68. DEFINE WIND LOAD *** NOTE: If any floor diaphragm is present in the model Wind Load definition should be defined after Floor Diaphragm definition. Otherwise…

  • RE: RAM Frame Negative Change in Frame Shear

    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…

  • RE: Master-Slave for Pitched Gable Roof Diaphragm

    For a pitched roof, your best bet is to define a mesh of plates to simulate the diaphragm. Assign the proper material and thickness to the plates to simulate the actual stiffness of the roof. XZ diaphragm options are only for planes which are parallel…

  • RE: Master Slave command

    I agree with what Amir’s observation. Instead of defining rigid master slave connection, I would suggest you to use the rigid floor diaphragm command to model the diaphragms. This would require small changes to be made to the model but it would help you…

  • RE: RAM Frame Story Shear with Multiple Diaphragms

    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…

  • RAM Meshing and Segmentation [TN]

    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…

  • RE: Diaphragm Collector & Chord

    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…

  • IS 1893-1 2002 Story Drift

    Applies To Product(s): STAAD.Pro Version(s): ALL Environment: ALL Area: STAAD.Pro Analysis Solution Subarea: Seismic Analysis Original Author: Bentley Technical Support…

  • Example Calculating Semirigid Diaphragm E'

    Product(s): RAM Structural System; Ram Frame Version(s): All (V8i; CONNECT Edition) Environment: N/A Area: Analysis See Also RAM Frame - Semirigid Diaphragms

  • RAM Frame - Criteria - Diaphragms

    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…

  • RAM Frame - Load Cases

    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…

  • RAM Frame Numbers

    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…

  • RE: Story Drift Results Interpretation

    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…

  • Featured LEARN Course: Assigning Properties to Steel Structures

    STAAD.Pro users familiar with the fundamentals of designing steel buildings who want to expand their knowledge to become more proficient should consider the “ Assigning Properties to Steel Structures ” course. Learn how to: • Utilize STAAD.Pro’s steel…

  • RAM Frame - Masses

    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…

  • RAM Frame - Rigid Diaphragm Constraints and Frame Shear [TN]

    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…

  • RAM Frame - Pseudo Flexible Diaphragms [FAQ]

    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…

  • RAM Frame - Semirigid Diaphragms FAQ

    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…

  • Multiframe - Joint Linking - Error Message when analyzing

    Hello, hope you are all well. I am trying to simulate a rigid diaphragm in Multiframe (simulate the floor) and I am getting the following error message regarding having a common Master node for the groups of linked in joints. It would be impossible to…
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