Week 8:Bolted Connections

Question 1

Out of the two types of bolted connections, which is the safest to use?
Connections with bolts in shear
Connections with bolts in tension

Answer 1

Connections with bolts in shear

Question 2

Why are connections with bolts in tension dangerous under dynamic loading?

Answer 2

Because cyclic loading may cause the bolts to lose the tension holding the members together

Question 3

List the three types of connections with bolts in shear

Answer 3

1-Splice connections in shear
2-Bolted gusset-plate connection to RHS
3-Flattened end connections with bolts in shear

Question 4

List 3 types of Splice connections with bolts in shear

Answer 4

1-interior/exterior splice plates
2-gusset with external splice bars
3-splice connections with nails in shear

Question 5

Where are splice connections with nails in shear typically used?

Answer 5

For poles in remote locations

Question 6

List two bad practices in bolted connection design

Answer 6

1-using too many small bolts

2-Cluttered/clumsy connection detailing

Question 7

What are the three failure modes of splice connections with nails in shear?

Answer 7

1-shear failure of fasteners
2-fastener bearing on base metal
3-Net section fracture of tube cross section

Question 8

What is the limitation of bolted gusset-plate connections to RHS

Answer 8

Member widths must be closely matched

Question 9

What are the six failure modes of bolted gusset plate to RHS connections

Answer 9

1-Shear failure of bolts
2-Bolt bearing failure (on HSS & gusset-plate)
3-Gross Yielding/buckling of gusset-plate
4-Tear Out of gusset plate
5-Tear Out of HSS (Block Shear)
6-Circumferential fracture due to shear lag

Question 10

Complete the sentence

Prying forces develop when flange plates …… against each other

Answer 10

Lever (pull, pry, prize, force)

Question 11

State one way to prevent prying action of bolts in tension

Answer 11

Use thick flange plates

Question 12

List the three types of connections with bolts in tension

Answer 12

1-Bolted ring flanges to CHS
2-Bolted flange-plate connection to CHS
3-Bolted flange-plate connection to RHS

Question 13

List the three benefits of including welds to bolted connections

Answer 13

1-Increases connection capacity
2-Reduces the distance between HSS and bolts
3-Increases the stiffness of flange-plates

Question 14

How is circumferential fracture due to shear lag mitigated?

Answer 14

By increasing plate insertion length

Question 15

Which failure mode of bolted connections is most common?

Answer 15

Block shear failure/Tear Out failure