Bentley Communities
Bentley Communities
  • Site
  • User
  • Site
  • Search
  • User
  • Welcome
  • Products
  • Support
  • About
  • More
  • Cancel
RAM | STAAD | OpenTower
  • Product Communities
  • More
RAM | STAAD | OpenTower
RAM | STAAD | OpenTower Wiki RAM SS Design Fy or Py
    • Sign in
    • Working Remotely with RAM or STAAD
    • -RAM | STAAD | OpenTower Wiki
      • +Integrated Structural Modeling
      • +Limcon
      • +Microstran
      • +MStower
      • +RAM Concept
      • +RAM Connection
      • +RAM Elements
      • +RAM SBeam
      • -RAM Structural System
        • +Known Issues in Ram Structural System
        • +RAM Structural System - Feature Articles
        • +RAM Structural System Release Notes
        • -RAM Structural System Support Solutions
          • +RAM Structural System - General Topics
          • +RAM Structural System - RAM Concrete
          • +RAM Structural System - RAM Foundation
          • +RAM Structural System - RAM Frame
          • +RAM Structural System - RAM Modeler
          • -RAM Structural System - RAM Steel
            • File/path access error with FloorVibe
            • Please specify the location of the FloorVibe.exe program
            • RAM SS - Steel Beam Deflection and Camber
            • RAM SS Design Fy or Py
            • +RAM SS FloorVibe [FAQ]
            • RAM SS Gravity Loads [FAQ]
            • RAM Steel - Report Viewer error
            • RAM Steel Beam Pattern Loading
            • Ram Steel Beam Unbraced Length
            • RAM Steel Beams [FAQ]
            • RAM Steel Column gives RAM Container error
            • +RAM Steel Columns [FAQ]
            • RAM Steel Joists [FAQ]
            • Steel Beam module fails to open
          • +RAM Structural System Tutorial
          • +What is RAM DataAccess? [TN]
        • RAM Structural System V17.0 License Consolidation
        • RAM Structural System Videos
      • +Scenario Services
      • +STAAD Advanced Concrete Design (RCDC)
      • +STAAD RCDC FE
      • +STAAD Foundation Advanced
      • +STAAD.building
      • +STAAD(X) Tower
      • +STAAD.offshore
      • +STAAD.Pro
      • +Structural Analysis Support Solutions
      • +Structural Dashboard
      • +Structural WorkSuite
      • Structural Synchronizer Links
    • +Seminars and Events
    • +Webinars

     
     Questions about this article, topic, or product? Click here. 

    RAM SS Design Fy or Py

      Applies To 
      Product(s): RAM Structural System; Ram Steel
      Version(s): Any
      Area:  Design

    Why are my beams being designed per the Canadian (or British) code with a Design Fy (or py) less than the Nominal yield stress assigned in the Modeler?

    Please review the Ram Manager manual, section 2.4.7 Canada Parameters, 2.4.8 BS 5950 Parameters and the Ram Steel Beam manual section 10.4 Design Yield Strength.

    To summarize, When using either of these codes for design, the steel material type for each type of structural member must be determined from a table. This steel type is combined with the nominal yield strength assigned to each individual member in the model to determine the steel grade and the design yield strength of the section.

    For example, a section of type W with a nominal Fy of 350N/mm2 is assigned a steel grade of 350W. But, a nominal Fy of slightly less than 350 will result in a steel grade of 300W. Consequently, assigning a yield stress of exactly 50 ksi while using English / Imperial units, will result in a steel grade of only 300W being used, since 50ksi = 344.7 N/mm^2 which is less than 350.

    Specifying a nominal Fy or material type that has no matching steel grade will result in a design yield strength of 0.0 and no grade assignment.

    In the Ram Manager under Criteria - Canada Parameters (or BS 5950 Parameters) where the specific grade for various section types can also be specified.

    For the example above, if the Material type A572/A992 is selected, then the beam will be designed with a Design Fy=50ksi

    The same is also true when using Ram SBeam as explained in the manual for that program. 

    For more on treatment of Class 4 sections in RAM Frame, see this article.

    Why is the design Fy 0 when using Eurocode

    Similar to the points above, in the Eurocode, per SCI Publication 362, there is alimited range of Fy values allowed depending on the nominal thickness of the material.

    Ram Structural System conforms to this requirement, assigning a Design fy value of 0 to anything outside the range. 

    This also affects steel design within Ram Frame (though the Design fy value is set to a tiny value just greater than zero there).

    Why is the composite beam Design py value 355 N/mm2 when the Nominal py is larger?

    According to BS 5950 1990 or 2000 codes, the design yield strength will never be larger than the engineer provided nominal yield strength. For composite construction, py is further limited to 355 N/mm2 as required by Clause 3.1.

    Base Plate Design

    A similar situation affects the Base Plate design in Ram Steel column for CSA S16-01 or S16-09 when using a Base Plate Yield stress (Fy) less than 260 N/mm^2 (38 ksi)

    See Also

    RAMSS Beams [FAQ]

    • Beam Design
    • RAM Structural System
    • Eurocode
    • py
    • Fy
    • BS 5950
    • RAM Steel
    • Share
    • History
    • More
    • Cancel
    • Seth Guthrie Created by Bentley Colleague Seth Guthrie
    • When: Tue, May 20 2014 5:58 PM
    • Seth Guthrie Last revision by Bentley Colleague Seth Guthrie
    • When: Thu, Jul 12 2018 1:03 PM
    • Revisions: 6
    • Comments: 0
    Recommended
    Related
    Communities
    • Home
    • Getting Started
    • Community Central
    • Products
    • Support
    • Secure File Upload
    • Feedback
    Support and Services
    • Home
    • Product Support
    • Downloads
    • Subscription Services Portal
    Training and Learning
    • Home
    • About Bentley Institute
    • My Learning History
    • Reference Books
    Social Media
    •    LinkedIn
    •    Facebook
    •    Twitter
    •    YouTube
    •    RSS Feed
    •    Email

    © 2021 Bentley Systems, Incorporated  |  Contact Us  |  Privacy |  Terms of Use  |  Cookies