Chat with AIExam 18: Material Steel and Steel Components
The thickness of sheet steel in a roof or floor deck is generally specified in terms of
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VerifiedA
Is reinforcing steel part of structural steel? Explain.
(36) VerifiedNo. Reinforcing steel consists of round bars, which is used as reinforcement in concrete. Such concrete is called reinforced concrete. Structural steel consists of hot- rolled sections.
In using spray- on fire protection for floor and roof assemblies, we generally apply the protection on roof decks and supporting beams, but in the case of the floor decks, we generally apply it only on the supporting beams, leaving the floor deck without spray- on protection. Explain the reason.
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Answered by Examlex AI CopilotThe reason for applying spray-on fire protection on roof decks and supporting beams, but not on floor decks, is due to the different fire protection requirements for each assembly. Roof assemblies are typically more exposed to potential fire hazards, such as from neighboring buildings or airborne embers, so it is important to provide fire protection to both the roof deck and supporting beams to prevent the spread of fire.
On the other hand, floor assemblies are generally less susceptible to direct fire exposure, especially in multi-story buildings where the floor decks are shielded by the floors above and below. Additionally, the floor deck itself is typically made of non-combustible materials, such as concrete or steel, which already provide a certain level of fire resistance. Therefore, the focus of fire protection for floor assemblies is primarily on the supporting beams, which are more vulnerable to fire damage.
By applying spray-on fire protection only to the supporting beams of floor assemblies, we can effectively protect the most critical components while also optimizing the use of fire protection materials and resources. This approach ensures that the floor assemblies meet the necessary fire safety standards without unnecessary over-protection.
What does the top chord and bottom chord of a K- series joist consist of?
(37) Steel joists and joist girders are best utilized in a building that has concentrated loads.
(31) To obtain the structural engineering properties of standard steel sections, the following publication is generally used.
(40) Steel is a noncombustible material. So why do steel components in buildings, such as W- section beams, steel joists, and joist girders, need protection against fire?
(36) Are steel joists and joist girders made of cold- formed steel or structural steel?
(39) In a steel angle, both legs must have the same thickness but may be of different lengths.
(40) Because of the manufacturing process, ferrous metals contain a certain amount of carbon. Cast iron has much larger amount of carbon (2.5% to 4%)as compared with steel (0.1% to 1.7%). How does carbon affect the property of cast iron and steel?
(38) The Steel Joist Institute (SJI)produces joists in three groups, each group referred to as a series. The three series are called: K- series joists, LH- series joists, and DLH- series joists. Which series is most commonly used?
(35) Which of the following decks requires structural concrete topping?
(48) Discuss the basic differences (in terms of chemical composition and important properties)among wrought iron, cast iron, and steel. Where would you recommend the use of wrought iron?
(32) Floor decks are made in two types-form deck and composite deck. What is a composite deck?
(43) Using sketches and notes, explain:
a. what a plate girder is and where it is used.
b. what a built- up steel section is and where it is used.
(34) What is the difference between an equal- leg angle and an unequal- leg angle?
(31) A K- series joist is identified by two numbers separated by letter K, such as 14K3. Explain what information is provided by the marks 14K3 and 14K1.
(39) A K- series steel joist that is 20 in. deep cannot be used to span more than
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