Steel Connection Design Quiz 6

What is the difference between gross area and net area in tension members?

• The net area includes the total cross-sectional area of the member

• The gross area includes the total cross-sectional area of the member, while the net area deducts the area of any holes or openings in the member.

• The gross area is smaller than the net area

• The gross area deducts the area of any holes or openings in the member

Answer explanation

The correct choice explains that the gross area is the total cross-sectional area of the member, while the net area is obtained by deducting the area of any holes or openings, highlighting the distinction between the two.

Explain the concept of effective area in tension members.

• refers to the area of the member that is not affected by tensile forces

• is the area of the member that is only effective in tension, not compression

• refers to the reduced cross-sectional area of the member due to the presence of holes, slots, or other openings which is partly connected.

• The effective area in members is the total area of the member including all holes or openings

Answer explanation

The effective area in tension members refers to the reduced cross-sectional area due to holes, slots, or openings. These features can weaken the member's ability to carry tensile loads, making this definition the most accurate.

How is the design strength of a tension member calculated?

• φFyAg

• Fy/φAg

• φAgFy

• AgFy/φ

Answer explanation

The design strength of a tension member is calculated using the formula φAgFy, where φ is the strength reduction factor, Ag is the gross area, and Fy is the yield strength. This choice correctly represents the calculation method.

What are the advantages of using bolted connections over welded connections?

• More aesthetically pleasing

• Stronger connections

• Faster installation process

• Easier disassembly and reassembly, flexibility for future modifications, and no specialized labor or equipment required

Answer explanation

Bolted connections offer easier disassembly and reassembly, allowing for flexibility in future modifications. They also do not require specialized labor or equipment, making them more accessible compared to welded connections.

Describe the process of determining the bolt capacity in a connection.

• Measuring the length and width of the bolt

• Checking the color and texture of the bolt

• Asking the bolt manufacturer for their opinion

• Calculating the shear and tension capacity of the bolted connection

Answer explanation

The correct process involves calculating the shear and tension capacity of the bolted connection, as this determines how much load the bolt can safely handle, ensuring structural integrity.

How is the gross area of a gusset plate calculated?

• By adding the width of the plate to the length of the plate.

• By dividing the length of the plate by the thickness of the plate.

• By subtracting the length of the plate from the thickness of the plate.

• By multiplying the thickness of the plate by the length of the plate.

Answer explanation

The gross area of a gusset plate is calculated by multiplying the thickness of the plate by the length of the plate. This gives the area in square units, which is essential for structural calculations.

Explain the significance of net area in the design of gusset plates.

• The net area of a gusset plate has no significance in design

• Net area is only important for aesthetic purposes

• Net area only affects the appearance of the gusset plate

• The net area of a gusset plate is significant in design as it determines the capacity of the plate to resist the applied loads and stresses after holes deduction.

Answer explanation

The net area of a gusset plate is crucial in design as it directly influences the plate's ability to withstand applied loads and stresses, accounting for the reduction in strength due to hole deductions.

What are the factors to consider when designing bolted connections for tension members?

• Color and texture of the bolt

• Length and width of the bolt

• Yield and Fracture strength of the bolted connection

• Manufacturer's opinion on the bolt

Answer explanation

When designing bolted connections for tension members, it's crucial to consider the yield and fracture strength of the connection. These factors ensure the connection can withstand applied loads without failure.

Explain the process of calculating the net area in gusset plates.

• By adding the width of the plate to the length of the plate.

• By dividing the length of the plate by the thickness of the plate.

• By subtracting the length of the plate from the thickness of the plate.

• By multiplying the thickness of the plate by the length of the plate after bolt hole subtraction

Answer explanation

To calculate the net area in gusset plates, multiply the thickness of the plate by the length of the plate after subtracting the area taken up by bolt holes. This ensures an accurate representation of the effective area.

Explain the process of calculating the gross area in gusset plates.

• By adding the width of the plate to the length of the plate.

• By multiplying the thickness of the plate by the length of the plate.

• By subtracting the length of the plate from the thickness of the plate.

• By dividing the length of the plate by the thickness of the plate.

Answer explanation

To calculate the gross area of gusset plates, multiply the thickness of the plate by the length of the plate. This gives the total area, which is essential for structural analysis.