Chapter 23 Flashcards
A reinforced concrete, four-side-supported slab panel is:
a. a one-way slab
b. a two-way slab
c. a four-way slab
d. a or b
d. a or b
A reinforced concrete, four side supported slab panel measuring 15 X 22ft is what kind of slab?
a two- way slab
A reinforced concrete, four side supported slab panel measuring 15 X 32ft is what kind of slab?
a one way slab
In a band beam reinforced concrete floor, the beams are ?
Wide and shallow
A band beam floor is generally more economical than a beam and girder floor because>
its formwork is more economical
A standard module one way joist floor is constructed using pans that are:
a. 20in wide
b. 30in wide
c. 40in wide
d. a or b
d. a or b
Based on structural considerations only, the thickness of the slab in a standard-module one-way joist floor needs to exceed
2in to 2 1/2in.
Pans used as formwork for one way joist floors have what type of shape?
U-shaped profile
A wide module one way joist floor is constructed using pans that are:
a. 66 in. wide
b. 60 in. wide
c. 53 in. wide
d. a or b
e. a or c
e. a or c
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 two directions are unequal, the beams should preferably span along the:
a. shorter direction
b. longer direction
a. shorter direction
The formwork used for a waffle slab has what shaped?
dome profile
Using standard formwork components for a waffle slab. the center to center distance between waffles (voids) is?
3ft, 4ft, or 5ft
A flat slab floor consists of?
a slab with drop panels at each column
A flat plate floor consists of :
a. slab of constant thickness
b. a slab with beams on all four sides of the slab panel
c. a slab with drop panels at each column
a. slab of constant thickness
Commonly used beamless concrete floors are?
flat plate and flat slab
in a posttensioned elevated concrete floor, prestressing tendons are combined with conventional steel reinforcement. True or false?
True
The primary reason for using posttensioned concrete floors is to?
reduce floor depth
The strength of concrete used in precast concrete members is generally how much ksi?
5ksi to 6ksi
Portland cement used in precast concrete members is generally what type?
Type III
Architectural precast refers to concrete members used building interiors. True or false?
False
In mixed precast construction, precast concrete members are generally used for?
floors
In total precast construction, precast concrete members are generally used for:
a. shear walls
b. load bearing walls
c. columns
d. floors
e. all of the above
e. all of the above
A 12in thick hollow core floor slab will generally span up to approximately how many feet?
40ft
When a concrete topping is used over hollow core slabs, its thickness is approximately how many inches?
2 inches
The purpose of concrete topping on hollow core slabs is to;
a. structurally integrate the slabs
b. level the top of slabs
c. increase sound insulation of the floor
d. increase the fire rating of the floor.
e. all of the above
e. all of the above
The most commonly used width of a double tee floor unit is?
8ft.
Double tee floors are commonly used where?
where spans are in excess of 50ft
The fire resistance rating of concrete members is a function of:
a. member thickness
b. type of coarse aggregate in concrete
c. concrete cover for corrosion protection
d. all of the above
d. All of the above
