Bentley Communities
Bentley Communities
  • Site
  • User
  • Site
  • Search
  • User
RAM | STAAD | ADINA
  • Product Communities
RAM | STAAD | ADINA
RAM | STAAD | ADINA Wiki Design Strips and Slab Openings [TN]
    • Sign In
    • -RAM | STAAD | ADINA Wiki
      • +ADINA
      • +iTwin Analytical Synchronizer_
      • +Structural Analysis Support Solutions
      • -RAM Concept
        • RAM Concept Key Features
        • +RAM Concept Feature Articles
        • RAM Concept Case Studies
        • +RAM Concept Getting Started Guides
        • RAM Concept Images
        • RAM Concept Videos
        • +RAM Concept Release Notes
        • -RAM Concept Support Solutions
          • +Installation - RAM Concept
          • +RAM Concept Capabilities [FAQ]
          • -RAM Concept Design Strips [TN]
            • Cross Section Trimming [TN]
            • Design Strips and Slab Openings [TN]
            • Generating Span Segments [FAQ]
            • Manual Design Strip Boundaries [TN]
          • +Ram Concept Design Topics
          • RAM Concept Files [FAQ]
          • +RAM Concept Load History Calc Options [TN]
          • RAM Concept Loading [FAQ]
          • +RAM Concept Modeling and Meshing [FAQ]
          • +RAM Concept Plans And Printing [FAQ]
          • +RAM Concept PT Optimization
          • +RAM Concept Reinforcement [FAQ]
          • +RAM Concept Tendons [FAQ]
          • +RAM Concept-RAM Structural System Integration [TN]
          • STAAD.Pro CONNECT Edition - Ram Concept
        • +Known Issues in Ram Concept
        • RAM Concept License Consolidation
      • +RAM Connection
      • +RAM Elements
      • +RAM SBeam
      • +RAM Structural System
      • +STAAD.Pro
      • +STAAD Foundation Advanced
      • +STAAD Advanced Concrete Design (RCDC)
      • +STAAD.building
      • +STAAD RCDC FE
      • +Scenario Services
      • +STAAD.offshore
      • +Limcon
      • +Microstran
      • +MStower
      • +Structural Dashboard
      • +Structural WorkSuite
    • +RAM | STAAD Learning Resources
    • Simplifications to Bentley's Engineering Simulation Software Licenses

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

    Design Strips and Slab Openings [TN]

      Applies To 
      Product(s): RAM Concept 
      Version(s): Various
      Area:  Modeling; Analysis; Design

    Overview

    The purpose of this tech note it to aid users in defining design strips and understanding the layout of program reinforcement around slab openings.

    Design Strips and Slab Openings

    The layout of span segments and generated design strips will depend on the size of the slab opening and its location relative to the column grid line.
    In general, it is best to model span segments so that they do not pass through a slab opening. When slab openings occur on a column grid line, the span segment may be shifted to one side of the opening or it may be divided into segments on each side of the opening.
    Small openings often lie between cross sections. These openings affect the design forces determined from the finite element analysis; however, the cross sections in the design strip are the same as those in the same design strip without the opening. In other words, the opening has no effect on the cross sectional areas used in the design checks. For these openings, the design strip hatch will extend through the opening and the extents of the program reinforcement will extend through the opening. See Figure 1.

    Figure 1. Small Opening Example

    Most openings intersect a cross section. When this occurs, the opening reduces the area of the cross section causing some cross section to be narrower than other cross sections. The boundary of the design strip is drawn as a series of line segments between the ends of adjacent cross sections so that the hatched design strip excludes much of the opening and the boundary of the design strip is skewed. In this case, the non-uniform design strip boundary can be ignored because it acts as a marker,  enveloping the different cross sections widths in the design strip. For these openings, the program typically places bars only in the narrow width without distributing the bars into the extra width in the wider cross sections on either side of the opening. See Figure 2. When the layout of program reinforcement is unacceptable, user reinforcement may be used to override the program designed reinforcement.
    Figure 2. Large Opening Example

    The layout of program reinforcement may be improved by modifying the layout of the span segments. For example, the design strip may be divided into cantilever strips that run from column to edge of slab with narrower strips on either side of the opening (See Figure 3 and Figure 4).

    Figure 3. Alternate Design Strip Layout
    Figure 4. Alternate Design Strip Layout

    More Information

    Please see RAM Concept Design Strips for additional help links.

      • Slab Opening
      • analysis
      • design
      • SELECTservices
      • RAM Concept
      • TechNote
      • design strip
      • Modeling
      • Share
      • History
      • More
      • Cancel
      • Karl G Created by Bentley Colleague Karl G
      • When: Tue, Oct 12 2010 10:03 AM
      • Seth Guthrie Last revision by Bentley Colleague Seth Guthrie
      • When: Wed, Mar 7 2018 12:54 PM
      • Revisions: 9
      • 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

      © 2023 Bentley Systems, Incorporated  |  Contact Us  |  Privacy |  Terms of Use  |  Cookies