Building Construction Chapter 9

Play an AI-generated podcast conversation about this lesson

What are the primary metals alloyed in steel?

Iron and vanadium

Iron and carbon (correct)

Iron and manganese

Carbon and molybdenum

Which element is added to steel to increase resistance to abrasion?

Molybdenum

Manganese (correct)

Vanadium

Carbon

What property of steel allows it to be shaped by rolling?

Strength

Brittleness

Toughness

Ductility (correct)

What is one inherent disadvantage of steel?

Tendency to rust when exposed to air and moisture (C) Signup and view all the answers

What property of steel makes it suitable for thin cross-section members like floor and roof decking?

High strength-to-weight ratio (B) Signup and view all the answers

What characteristic of steel is most significant to firefighters in the event of a fire?

Deterioration of strength at elevated temperatures (C) Signup and view all the answers

Why does heating steel during a fire incident not occur uniformly?

Variation in mass and type of connections used (C) Signup and view all the answers

What is the purpose of encasing a steel column in 3 inches of concrete with a siliceous aggregate?

To achieve a fire resistance rating of 4 hours (A) Signup and view all the answers

What is a common misconception about the fire resistance of steel?

Steel is inherently fireproof (A) Signup and view all the answers

What is the purpose of intumescent materials in fire protection?

To expand and act as an insulating material to protect steel (B) Signup and view all the answers

What does the process of calcination involve in relation to gypsum?

Driving free and chemically bound water out of gypsum (D) Signup and view all the answers

What is the function of mastic coatings in fire protection?

They are based on more complex organic materials and provide good adhesion (B) Signup and view all the answers

How do membrane ceilings contribute to fire resistance?

Provide a floor and ceiling assembly with a resistive rating depending on specific installation details (A) Signup and view all the answers

What type of connection in a rigid frame is designed to resist bending forces from supported loads and lateral forces?

Welds and bolted brackets (C) Signup and view all the answers

Where are steel arches commonly used to support roofs?

Gyms and convention halls (A) Signup and view all the answers

What does drawing steel bars through a die to produce wire significantly increase?

Strength of steel (D) Signup and view all the answers

What are steel rigid-frame buildings with inclined roofs commonly used for?

One-story industrial buildings and farm buildings (A) Signup and view all the answers

What is the primary purpose of a gusset plate in a steel frame structure?

To strengthen a connection and increase the steel mass at the connection (C) Signup and view all the answers

What does the slenderness ratio of a column indicate?

The likelihood of buckling based on the unbraced length and cross-sectional area (D) Signup and view all the answers

In steel-frame buildings, what is commonly used to support lightweight concrete flooring?

Corrugated steel decking supported by open web steel joists (A) Signup and view all the answers

What should be avoided in structural support columns to prevent buckling?

Ratios greater than 120 between unbraced length and shape/area of cross section (A) Signup and view all the answers