Problem 1 1. Axial load effects in Kips, where C-compression, T=tension) for various load types in members AB (D=10 (C). L=140 (T), W=160 (T)) and AC( D=20 (T), L=50 (C), W=135 (C) of a steel frame system. Find (a) (5 points) factored axial demand in member AB (b) (5 points) factored axial demand in member AC 2. A closer look at joint of member AB of the frame system in (1) where a preliminary design has been determined is shown in the drawing below. The tension member is connected to the gusset plate with 7/8-in diameter bolts (Type A490,"N"). 3/8" Gusset PL A36 2C8 x 18.75 A572 Gr 50 5@1.5" 49.31 Determine the tensile strength considering the limit states of: (a) (5 points) yield in the gross (b) (10 points) fracture in the net (15 points) block shear (assume gusset plate controls) (d) (5 points) is the member adequate for the applied factored loads in (1)? How? 3. Now consider the connection of the member considered above, and answer the following 3.1 Bolted-Connection (a) (3 points) does the connection meet spacing and edge distance requirements? (b) (5 points) what is the shear capacity of the provided bolts? (7 points) what is the bearing capacity? 3.2 Welded-Connection (15 points) Considering an optional design via the welded-connection detail shown, what should the weld size w be so that the design strength of the bolted-connection above can be achieved through this welded connection as well? 3/8 "Gusset PL A36 W E70 208 x 18.75 A572 Gr 50 4. (25 points) Find the ratio (L2/LI) so that similar compressive strength is achieved for columns with the following boundary conditions: i. Pin-Pin (W21x50, A992 steel, L1=20 ft., minor-axis bracing is provided at one-third of the length from the top), ii. Fixed-Pin (W16x50, A992 steel, L2 ft., minor-axis bracing is provided at one-third of the length from the fixed end). Assume local stability is not a concern. Problem 1 1. Axial load effects in Kips, where C-compression, T=tension) for various load types in members AB (D=10 (C). L=140 (T), W=160 (T)) and AC( D=20 (T), L=50 (C), W=135 (C) of a steel frame system. Find (a) (5 points) factored axial demand in member AB (b) (5 points) factored axial demand in member AC 2. A closer look at joint of member AB of the frame system in (1) where a preliminary design has been determined is shown in the drawing below. The tension member is connected to the gusset plate with 7/8-in diameter bolts (Type A490,"N"). 3/8" Gusset PL A36 2C8 x 18.75 A572 Gr 50 5@1.5" 49.31 Determine the tensile strength considering the limit states of: (a) (5 points) yield in the gross (b) (10 points) fracture in the net (15 points) block shear (assume gusset plate controls) (d) (5 points) is the member adequate for the applied factored loads in (1)? How? 3. Now consider the connection of the member considered above, and answer the following 3.1 Bolted-Connection (a) (3 points) does the connection meet spacing and edge distance requirements? (b) (5 points) what is the shear capacity of the provided bolts? (7 points) what is the bearing capacity? 3.2 Welded-Connection (15 points) Considering an optional design via the welded-connection detail shown, what should the weld size w be so that the design strength of the bolted-connection above can be achieved through this welded connection as well? 3/8 "Gusset PL A36 W E70 208 x 18.75 A572 Gr 50 4. (25 points) Find the ratio (L2/LI) so that similar compressive strength is achieved for columns with the following boundary conditions: i. Pin-Pin (W21x50, A992 steel, L1=20 ft., minor-axis bracing is provided at one-third of the length from the top), ii. Fixed-Pin (W16x50, A992 steel, L2 ft., minor-axis bracing is provided at one-third of the length from the fixed end). Assume local stability is not a concern