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Design of Tubular Steel Structures > Week 5:Fire Resistance > Flashcards

Week 5:Fire Resistance Flashcards

1
Q

In how many ways can HSS be filled with concrete as fire protection?

A

3 ways
PC-with plain concrete
RC-with reinforced concrete/bar reinforced concrete
FC-with steel fibre-reinforced concrete

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2
Q

According to current research, what is the range of fire resistance of PC-filled HSS columns?

A

One to two hours

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3
Q

According to current research, what is the maximum fire resistance for RC-filled and FC-filled HSS columns?

A

Three hours

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4
Q

How do PC-filled HSS columns fail under fire load?

A

By sudden contraction and overall buckling

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5
Q

How do RC-filled and FC-filled HSS columns fail under fire load?

A

By gradual contraction

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6
Q

List the 7 most important factors that influence the fire resistance of concrete filled HSS columns

A 
1 D (outer diameter/width of section)
2 KL (effective length of section)
3 concrete cover
4 type & percentage of reinforcement
5 type of aggregate 
6 concrete strength
7 load on column
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7
Q

At room temperature, do the concrete and steel act together?

A

Yes

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8
Q

List the 3 stages steel undergoes as heat is applied

A

1 longitudinal expansion
2 decrease in yield strength and elastic modulus
3 steel yields and load is transferred to concrete

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9
Q

Is it advisable to increase the wall thickness of an HSS column to improve fire resistance?

A

No

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10
Q

List 4 types of buildings where concrete-filled HSS columns can be used

A

1 schools
2 mezzanine floor supports
3 two - three storey assembly buildings
4 prisons

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11
Q

What components make up a fire triangle?

A

Fuel load
Ignition
Ventilation

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12
Q

In order of decreasing relevance, list 4 principles guiding fire safety design

A

1 safety of building occupants
2 safety of emergency responders
3 protection of adjacent property
4 protection of subject property

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13
Q

What does FRR stand for?

A

Fire Resistance Rating

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14
Q

List 4 types of fire protection systems

A

1 directly applied systems
2 membrane systems
3 water systems
4 concrete-filling systems

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15
Q

List 3 examples of directly applied fire protection systems

A

1 Spray-applied Fire Resistive Material (SFRM) eg intumescent coating
2 Cellulose fillers
3 mineral fibres

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16
Q

List 1 example of water fire protection systems

A

Sprinkler system

17
Q

List 1 example of membrane fire protection systems

A

1 gypsum board

18
Q

At which critical temperature does steel yield under fire

A

550 degrees

Design of Tubular Steel Structures (8 decks)

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