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:
Firstly, users will have to run static analysis to calculate and generate FEM results:
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.
Graitec Slab Design Module provides two ways to define the strips:
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:
By easily defining strips and reinforcement settings designers can create a realistic model where rebars are automatically placed in the slab:
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