HEADER DESIGN Sample Clauses

HEADER DESIGN. The length of the header in figure 2-4 is five feet six inches long. The unbraced length at the top of the header is 16 inches, the same as the joist spacing. Note: If there were a knee wall above the header, then the unbraced length would be the distance between supports, not 16 inches on center. The unbraced length of the bottom of the header is the distance between supports. The floor dead load is the combined weight of the floor materials and the joists, in this situation it is 15 pounds per square foot. Beam self-weight is taken into account by the program so it does not need to be included in the dead load you enter. The applicable building code determines the floor live load, for this case it will be 40 pounds per square foot. The header is supporting a floor tributary width of six feet. The roof live load and dead load is 25 psf and 15 psf, respectively. The header is supporting a roof tributary width of 8.17 feet as shown in figure 2-5 under “Lower Equiv. Tributary Width”. The roof pitch is 4:12. The wall above the header is eight feet tall and it weighs approximately 10 psf/per foot of wall height, therefore the total wall load on the header is 80 plf. Note: Additional load is transferred to the lower bearing support when roof rafters have cantilevered xxxxx. StruCalc automatically calculates this additional load in terms of tributary width so that it can be conveniently entered into the beam modules. In this case, the equivalent tributary width (8.17’) is only .17’ longer then the actual tributary width (8’) and therefore will make little difference in the rafter design. However, in some cases the additional load transferred to the lower bearing support because of cantilevered rafters is substantial therefore it is important to check the lower equivalent tributary width of each rafter design.