Question

1. concrete slabs can control forces in one or two directions. what is true of one - way slabs?

a. can span up to 12 feet
b. can span up to 20 feet
c. has a length - to - width ratio of less than 2
d. uses more steel bar reinforcement

1. concrete slabs can control forces in one or two directions. what is true of two - way slabs?

a. can span up to 20 feet
b. has a length - to - width ratio of less than 2
c. uses more steel bar reinforcement
d. all of the above

1. in a slab, when are the tensile forces greatest at the top?

a. in the slabs center
b. where the slab meets the column
c. over the columns
d. in the slabs center and over the columns

1. in general, two - way slabs are more expensive because they..

a. are smaller
b. are bigger
c. use more concrete
d. use more steel

1. in order to determine the type of slab to use, engineers and architects consider...

a. loads or forces applied
b. material properties
c. aspect ratio
d. all of the above

Explanation:

1. One - way slabs can span up to 12 feet. Two - way slabs have a length - to - width ratio of less than 2.
2. Two - way slabs can span up to 20 feet, have a length - to - width ratio of less than 2 and use more steel bar reinforcement.
3. Tensile forces are greatest at the top over the columns in a slab.
4. Two - way slabs are more expensive because they use more steel.
5. Engineers and architects consider loads or forces applied, material properties and aspect ratio to determine the type of slab to use.

Answer:

1. A. Can span up to 12 feet
2. D. All of the above
3. C. Over the columns
4. D. Use more steel
5. D. All of the above