What angle of the concrete strut should I take in assessing the shear strength to Eurocode 2 as it is not set at 45 degrees?
The concrete strut can be varied between 21.8° and 45°. The shallower the angle the more efficient the design. Generally, it will be found that a strut angle of 21.8° provides adequate strength and it is therefore advised to assume this in the first instance. For short beams and transfer beams the strut angle may need to be increase and the angle required can be calculated. Further guidance is given in How to design concrete structures using Eurocode 2, chapter 4, beams.
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