Csm 202 Test 3

Front 1

A reinforced concrete wall is limited to a slenderness ratio of

Back 1

25

Front 2

The longitudinal reinforcing in a tied column is held in place by stirrups, commonly a No. 3 or No. 4.

Back 2

false

Front 3

Formwork is a permanent structure that supports its own weight and that of the freshly placed concrete as well as the construction live loads including materials, equipment, and workmen

Back 3

false

Front 4

For maximum strength, the direction of plyform grain in the face layers should be placed parallel to the span

Back 4

true

Front 5

The failure mode for a stud is crushing

Back 5

false

Front 6

Partially seasoned wood is used for formwork because it is the most stable. Fully dried lumber will warp and crack during hot weather, while green timber will swell excessively when it becomes wet

Back 6

false

Front 7

After the forms have been removed, shores are placed snugly under a concrete slab.

Back 7

false

Front 8

Inadequate bracing and vibration are causes of formwork failure.

Back 8

true

Front 9

In slab form design, the horizontally spanning members are assumed to be continuous beams and are therefore statically determinate.

Back 9

false

Front 10

Shores and mudsills must rest on frozen ground

Back 10

false

Front 11

??? hold concrete forms secure against the lateral pressure of unhardened concrete

Back 11

Ties

Front 12

??? or column clamps encircle column forms and hold them together securely.

Back 12

Yokes

Front 13

The applicable adjustment factors for allowable bending stress are load duration, wet service, size, flat use, temperature, and stability.

Back 13

false

Front 14

Two main factors that affect the design load/lateral pressure in concrete wall forms are

Back 14

TEMPERATURE AND RATE OF PLACEMENT OF CONCRETE

Front 15

List two job built form work components that behave like a beam

Back 15

STRIGERS AND JOISTS, WALES

Front 16

List two objectives of the form builder

Back 16

QUALITY and SAFETY

Front 17

Slab formwork is designed for nonuniformly distributed vertical loads

Back 17

false

Front 18

The definitive design specification for reinforced concrete in North America is the

Back 18

ACI CODE

Front 19

A major source of cracking in concrete is structural action

Back 19

True

Front 20

One way to resist cracking in concrete is to use

Back 20

CONTROL JOINTS

Front 21

Reinforced concrete beams subjected to bending moments develop cracks that extend almost to the ??? where the strain is zero

Back 21

NEUTRAL SURFACE/AXIS

Front 22

Why does concrete crack

Back 22

LOW TENSILE STRENGTH

Front 23

To ensure that wet concrete mix passes through the reinforcing steel without separation, the code specifies minimum ??? of steel bars.

Back 23

spacing

Front 24

• Over-reinforced beams have a ductile failure which is why the code specifies a maximum amount of tensile steel reinforcement.

Back 24

false

Front 25

For reinforced concrete beams, the stirrups are placed to resist cracks due to???

Back 25

Shear

Front 26

In reinforced concrete, the reinforcement is designed to resist ??? while the concrete is designed to resist ???

Back 26

TENSILE FORCES/TENSION...COMPRESSIVE FORCES/COMPRESSION

Front 27

• One of the reasons the coed specifies minimum concrete cover is to ensure that there is adequate bonding between the coarse aggregate and the steel reinforcement

Back 27

false