The door header in Fig. 7.C supports a dead load of 120 lb/ft and a roof live load of 120 lb/ft. Lumber is No. 2 Hem-Fir. CM = 1.0, Ct = 1.0, and Ci = 1.0. There are no bolt holes at the point of maximum moment. Lateral stability is not a problem. Find:
a. Check the given member size under the following loading conditions: Vertical loads only UBC-required combinations of vertical loads and lateral forces
b. Which loading condition is the more severe?