Table Notes

1. Calculated loads are based upon AISI S240 section B3.3 Header Design
2. Allowable deflection limit is L/360. The moment of inertia used is double the value of a single member
3. Allowable capacities have not been modified for wind or earthquake loading.
4. Headers are made from two “boxed” or back-to-back members.
5. The allowable moment, shear, and web crippling values used for load determination are double the value of a single member.
6. Web crippling checks are based upon end-one flange loading condition using 1 inch end bearing.
7. Capacities are calculated for unpunched members only.
8. Members are assumed to be adequately braced for bending.
9. Allowable loads are for simply supported headers with uniform bending loads only.
10. Where allowable loads are followed by “e”, web stiffeners are required at each support