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Beam Hanger Reinforcement

Related to minimum dimensions, minimum penetration thread length, and how to obtain the required reinforcing length without the tabulated values from our Beam Hanger Design Guide.

Where can we find the distance to the furthest extent screw at each connection component (h_sm / h_pm)? 

The distance from the extreme fiber of the beam to the furthest extent screw can be obtained from the dimensioned drawing of the Ricon S VS series in the Beam Hanger Design Guide. HM will always be towards the top of the beam and hSM will always be towards the bottom. These two values are essentially the height of the virtual notch created in the respective beam.

The maximum height placement recommendation is required to reduce perpendicular to grain tension and the associated premature splitting. A high-in-section install is often viewed as the introduction of a virtual notch in similar fashion as it would occur with a high mounted angle bracket. Notch depth is commonly limited by design codes.

 

How can we calculate the reinforcement required for scenarios that are not listed in the design guide?

Where the value is not listed, you can use the equation from ETA-15/0667 of 20/11/2019 issued by the OIB:

    • This is the equation that provides the values in the tables on page 68 of the Beam Hanger Design Guide for reinforcement minimum thread penetration length. Where we use (1-hi/di) instead of (aJ/H/HJ/H) and the total factored load over the withdrawal strength of the fastener [kips/in] instead of F90,d to get the required minimum penetration length. This equation is taken from notch reinforcement, but F90,d does not see any sort of amplification as it is a virtual notch and doesn’t see the initial stress concentration that a notch would have.

What would be the recommended minimum effective penetration length of a given fastener?
The minimum required penetration length (pt) doesn’t relate to a single fastener, just the total amount of penetration required above the extreme fastener and within the bottom 30% of the depth in the secondary beam, according to the ETA-15/0667 of 20/11/2019. The reinforcement must be achieved by at least 2 screws as per the reinforcement notes. The collective sum of all fasteners (max 1 row) used in the reinforcement solution must meet the value such that pt < min(pt1, pt2) and the reinforcing screws achieve penetration of at least 4*d in the d*30% region.