PROBLEMS 1. Using the dimensions given in Fig. 4.16, determine the required section modulus, z, for rafters RA, RB, RC, and RD. 2. Using the dimensions given in Fig. 4.16, determine the required section modulus, z, for girders GA, GB, and GC. 3. Using the dimensions given in Fig. 4.16, determine the required radius of gyration for columns Ci, C2, C3, and C4. 4. Derive a relation comparable to Eq. 4.6 for use with aluminum roof plates. C-1 (1 required) 51-2 21-01 radius GAS 39-04 radius 25 RAZ C-2 (5 required) 49-3 57'-0" radius 60 RC750 RB2 C-3 (10 required) 48-3 75-0 radius 75 RD7 C-4 (15 required) -47-3" Notes: Tank diameter, 150'-0" Roof plates, Xi" (7.65 ) Fig. 4.16. Rafter and girder layout for a 150-ft-diameter cone-roof tank. PROBLEMS 1. Using the dimensions given in Fig. 4.16, determine the required section modulus, z, for rafters RA, RB, RC, and RD. 2. Using the dimensions given in Fig. 4.16, determine the required section modulus, z, for girders GA, GB, and GC. 3. Using the dimensions given in Fig. 4.16, determine the required radius of gyration for columns Ci, C2, C3, and C4. 4. Derive a relation comparable to Eq. 4.6 for use with aluminum roof plates. C-1 (1 required) 51-2 21-01 radius GAS 39-04 radius 25 RAZ C-2 (5 required) 49-3 57'-0" radius 60 RC750 RB2 C-3 (10 required) 48-3 75-0 radius 75 RD7 C-4 (15 required) -47-3" Notes: Tank diameter, 150'-0" Roof plates, Xi" (7.65 ) Fig. 4.16. Rafter and girder layout for a 150-ft-diameter cone-roof tank