Question 1

In the case of a one- way joist floor system, the joists span in one direction and the beams span in the other (perpendicular)direction. If the two spans are unequal, in which direction (shorter or longer)should the beams span and why?

Accepted Answer

If the spans are unequal, the ...

Question 2

Commonly used beamless concrete floors are

Accepted Answer

A)  beam- and- girder floors.
B)  flat- plate and flat- slab floors.
C)  one- way and two- way joist floors.
D)  all of the above.

Question 3

In which situations are inverted- tee beams used?

Accepted Answer

To support...

Question 4

What is the center- to- center spacing of joists in standard- module, one- way joist floors?

Accepted Answer

Standard- module, on...

Question 5

Using sketches and notes, explain beam- and- girder floor systems.

Accepted Answer

Beam-and-girder floor systems are a type of structural system commonly used in building construction. This system consists of a series of horizontal beams and girders that support the weight of the floor and any loads placed on it.

The beams are the primary horizontal members that span between columns or walls and support the girders. The girders, in turn, support the beams and transfer the load to the columns or walls. This creates a grid-like pattern of support throughout the floor, allowing for efficient distribution of the load.

Sketches and notes can be used to illustrate how the beams and girders are arranged and connected within the floor system. This can help to visualize the overall layout and understand how the system functions to support the structure above.

In addition to providing structural support, beam-and-girder floor systems also allow for flexibility in the layout of the floor space below. Because the beams and girders can span long distances, they can create open floor plans without the need for interior support walls or columns.

Overall, beam-and-girder floor systems are a versatile and efficient way to support the weight of a building's floors while also allowing for flexibility in the design of the space below. Sketches and notes can be valuable tools for understanding and communicating the details of these systems in building construction.

Question 6

What is the other commonly used term for a two- way joist floor?

Accepted Answer

The answer of What is the other commonly used term...

Question 7

The most commonly used width of a double- tee floor unit is

Accepted Answer

A)  8 ft.
B)  4 ft.
C)  6 ft.
D)  none of the above.

Question 8

A band beam floor is generally more economical than a beam- and- girder floor because

Accepted Answer

A)  it requires a smaller quantity of reinforcement.
B)  it requires a smaller quantity of concrete.
C)  its formwork is more economical.
D)  none of the above. C

Question 9

The fire- resistance rating of concrete members is a function of

Accepted Answer

A)  concrete cover for corrosion protection.
B)  type of coarse aggregate in concrete.
C)  member thickness.
D)  all of the above.

Question 10

A flat plate floor consists of

Accepted Answer

A)  a slab with drop panels at each column.
B)  a slab of constant thickness.
C)  a slab with beams on all four sides of the slab panel.
D)  none of the above.

Question 11

Concrete construction can either be done as cast- in- place concrete or precast concrete. Give three disadvantages of precast concrete.

Accepted Answer

(i)Cost of transportation is high becaus...

Question 12

In a one- way joist floor, the supporting beams run in one direction and the joists run in the other direction. If the spans in the two directions are unequal, the beams should preferably span along the

Accepted Answer

A)  shorter direction.
B)  longer direction. A

Question 13

Portland cement used in precast concrete members is generally

Accepted Answer

A)  Type I.
B)  Type V.
C)  Type III.
D)  Type IV.
E)  Type II.

Question 14

What is the width of pans in standard- module, one- way joist floors?

Accepted Answer

20 in. for joists sp...

Question 15

A wide- module one- way joist floor is constructed using pans that are

Accepted Answer

A)  53 in. wide.
B)  60 in. wide.
C)  66 in. wide.
D)  A or B.
E)  A or C.

Question 16

A flat- plate or a flat- slab floor is a beamless concrete floor. However, in many situations, such floor slabs are often provided with shallow perimeter beams. What is that in response to?

Accepted Answer

To support...

Question 17

Why is the one- way joist floor a popular structural system in concrete construction?

Accepted Answer

Because the formwork required ...

Question 18

A reinforced- concrete, four- side- supported slab panel measuring 15 ft × 22 ft is

Accepted Answer

A)  a one- way slab.
B)  a two- way slab.
C)  a four- way slab.
D)  A or B.
E)  none of the above.

Question 19

Which floor system-one- way joist floor or two- way joist floor-is more commonly used in contemporary concrete construction and why?

Accepted Answer

One- way joist floor is more c...

Question 20

The posttensioning of elevated concrete floors reduces the slab and beam dimensions. This reduces the cost of concrete and reinforcing bars but is compensated for by the added cost of posttensioning steel and the use of more skilled (posttensioning)labor. So, why is posttensioning of concrete structures so popular.

Accepted Answer

A major advantage of reduced structural ...

Exam 23: Concrete Construction-II Site-Cast and Precast Concrete Framing Systems

In the case of a one- way joist floor system, the joists span in one direction and the beams span in the other (perpendicular)direction. If the two spans are unequal, in which direction (shorter or longer)should the beams span and why?

Correct Answer
verified
If the spans are unequal, the ...
View Answer

Commonly used beamless concrete floors are

Correct Answer
verified

In which situations are inverted- tee beams used?

Correct Answer
verified
To support...
View Answer

What is the center- to- center spacing of joists in standard- module, one- way joist floors?

Correct Answer
verified
Standard- module, on...
View Answer

Using sketches and notes, explain beam- and- girder floor systems.

What is the other commonly used term for a two- way joist floor?

Correct Answer
verified

The most commonly used width of a double- tee floor unit is

Correct Answer
verified

A band beam floor is generally more economical than a beam- and- girder floor because

Correct Answer
verified
C

The fire- resistance rating of concrete members is a function of

Correct Answer
verified

A flat plate floor consists of

Correct Answer
verified

Concrete construction can either be done as cast- in- place concrete or precast concrete. Give three disadvantages of precast concrete.

Correct Answer
verified
(i)Cost of transportation is high becaus...
View Answer

In a one- way joist floor, the supporting beams run in one direction and the joists run in the other direction. If the spans in the two directions are unequal, the beams should preferably span along the

Correct Answer
verified
A

Portland cement used in precast concrete members is generally

Correct Answer
verified

What is the width of pans in standard- module, one- way joist floors?

Correct Answer
verified
20 in. for joists sp...
View Answer

A wide- module one- way joist floor is constructed using pans that are

Correct Answer
verified

A flat- plate or a flat- slab floor is a beamless concrete floor. However, in many situations, such floor slabs are often provided with shallow perimeter beams. What is that in response to?

Correct Answer
verified
To support...
View Answer

Why is the one- way joist floor a popular structural system in concrete construction?

Correct Answer
verified
Because the formwork required ...
View Answer

A reinforced- concrete, four- side- supported slab panel measuring 15 ft × 22 ft is

Correct Answer
verified

Which floor system-one- way joist floor or two- way joist floor-is more commonly used in contemporary concrete construction and why?

Correct Answer
verified
One- way joist floor is more c...
View Answer

Correct Answer
verified
A major advantage of reduced structural ...
View Answer

Exam 23: Concrete Construction-II Site-Cast and Precast Concrete Framing Systems

In the case of a one- way joist floor system, the joists span in one direction and the beams span in the other (perpendicular)direction. If the two spans are unequal, in which direction (shorter or longer)should the beams span and why?

Correct AnswerverifiedIf the spans are unequal, the ...View AnswerShow Answer

Commonly used beamless concrete floors are

Correct AnswerverifiedShow Answer

In which situations are inverted- tee beams used?

Correct AnswerverifiedTo support...View AnswerShow Answer

What is the center- to- center spacing of joists in standard- module, one- way joist floors?

Correct AnswerverifiedStandard- module, on...View AnswerShow Answer

Using sketches and notes, explain beam- and- girder floor systems.

What is the other commonly used term for a two- way joist floor?

Correct AnswerverifiedShow Answer

The most commonly used width of a double- tee floor unit is

Correct AnswerverifiedShow Answer

A band beam floor is generally more economical than a beam- and- girder floor because

Correct AnswerverifiedC

The fire- resistance rating of concrete members is a function of

Correct AnswerverifiedShow Answer

A flat plate floor consists of

Correct AnswerverifiedShow Answer

Concrete construction can either be done as cast- in- place concrete or precast concrete. Give three disadvantages of precast concrete.

Correct Answerverified(i)Cost of transportation is high becaus...View AnswerShow Answer

In a one- way joist floor, the supporting beams run in one direction and the joists run in the other direction. If the spans in the two directions are unequal, the beams should preferably span along the

Correct AnswerverifiedA

Portland cement used in precast concrete members is generally

Correct AnswerverifiedShow Answer

What is the width of pans in standard- module, one- way joist floors?

Correct Answerverified20 in. for joists sp...View AnswerShow Answer

A wide- module one- way joist floor is constructed using pans that are

Correct AnswerverifiedShow Answer

A flat- plate or a flat- slab floor is a beamless concrete floor. However, in many situations, such floor slabs are often provided with shallow perimeter beams. What is that in response to?

Correct AnswerverifiedTo support...View AnswerShow Answer

Why is the one- way joist floor a popular structural system in concrete construction?

Correct AnswerverifiedBecause the formwork required ...View AnswerShow Answer

A reinforced- concrete, four- side- supported slab panel measuring 15 ft × 22 ft is

Correct AnswerverifiedShow Answer

Which floor system-one- way joist floor or two- way joist floor-is more commonly used in contemporary concrete construction and why?

Correct AnswerverifiedOne- way joist floor is more c...View AnswerShow Answer

Correct AnswerverifiedA major advantage of reduced structural ...View AnswerShow Answer

Correct Answer
verified
If the spans are unequal, the ...
View Answer

Correct Answer
verified

Correct Answer
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To support...
View Answer

Correct Answer
verified
Standard- module, on...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
C

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
(i)Cost of transportation is high becaus...
View Answer

Correct Answer
verified
A

Correct Answer
verified

Correct Answer
verified
20 in. for joists sp...
View Answer

Correct Answer
verified

Correct Answer
verified
To support...
View Answer

Correct Answer
verified
Because the formwork required ...
View Answer

Correct Answer
verified

Correct Answer
verified
One- way joist floor is more c...
View Answer

Correct Answer
verified
A major advantage of reduced structural ...
View Answer