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Slab concrete design using Strip method in Graitec Advance Design 2022

Strip method is a lower bound approach used to determine the moment field that fulfils equilibrium requirements, which leads to adequate and sufficient plastic behavior of the slab. Therefore, it became a practical design method that deliver the needed reinforcement in an economic way and simple to use even for complicated shapes. Discovered by Swedish scientist Hillervborg in 1956, the theory was established as an alternative to the yield line theory to address the need of a safer design against bending failure. Since then, the theory has gained popularity and trust among designers.

Using the 2022 version of Graitec Advance Design and Design module designers are capable of modeling and generating reinforcement for a variety of slabs:

Slab concrete design using Strip method in Graitec Advance Design 1

Firstly, users will have to run static analysis to calculate and generate FEM results:

Slab concrete design using Strip method in Graitec Advance Design 2

Secondly, the user will define and draw strips using the design module tool, these elements are defined as polylines. Two types of strips are used for this case: strips overs support, or columns called support strips and middle strips for intermediate zones.

iSlab concrete design using Strip method in Graitec Advance Design 3

Graitec Slab Design Module provides two ways to define the strips:

  • Using the automatic generator: Design Module allows the user to generate strips for all different models, by simply clicking on this icon Slab concrete design using Strip method in Graitec Advance Design 4 icon strips will be created in both directions accordingly.
  • For the second method users can manually draw the polylines. Strips are configurated from design Settings:

Slab concrete design using Strip method in Graitec Advance Design 4

Slab concrete design using Strip method in Graitec Advance Design 5

  • To easily create polylines in specific locations, Design module has a grid generator which can be set from Settings section:

Slab concrete design using Strip method in Graitec Advance Design 6

  • Strips are created using add the strip tool and can be modified subsequently. The green arrow is for the support strip and the violet is for middle strips.

Slab concrete design using Strip method in Graitec Advance Design 7

Along each strip sections are positioned perpendicularly to the boundaries. They are used to calculate the moment diagram by integrating the resulting moment distribution from FEM analysis.

By launching Calculate the Design Module will use the design moment to compute and generate reinforcements which are based on defined code, both CSA A23.3-19 and ACI318-14 are available in this new feature:

Slab concrete design using Strip method in Graitec Advance Design 8

By easily defining strips and reinforcement settings designers can create a realistic model where rebars are automatically placed in the slab:

Slab concrete design using Strip method in Graitec Advance Design 9

If you are an Advance Design fan or would like to find out more about it, subscribe to get notified of new posts and check out the Advance Design Virtual Booth. It has been updated with new content for the 2022 release. 

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