CNST 251 Chapter 4

Pataasin ang iyong marka sa homework at exams ngayon gamit ang Quizwiz!

In a simple three member truss consisting of two rafters and a tie each member is in

Tension

The unit of modules of elasticity is

all of the above

The material in an arch is primarily in

compression

A 20 ft high column shortens by .6 in under a load. What is the resulting strain in the column

.0025

Which gives greater warning before failure?

Ductile material

In most materials the safety margin for compressive stress and bending stress is the same

False

A rectangular column measuring 12 in X 12 in in cross section carries a load of 18 kps. What is the stress in the column?

None of the above

In a typical stress-strain diagram of a material, the stress is generally plotted along the vertical axis

True

The bending stress along the neutral axis of a beam are

Zero

When a cable or rope is compressed by a force, what is the compressive stress in it?

Zero

Concrete is

an elastic material

Low-carbon (mild) steel is

an elastic-plastic material

The horizontal blocking in wood studs helps prevent

buckling of studs

The test specimen used for determining the compressive strength of concrete in the US is a

cylinder measuring 6 in in diameter X 12 in high

In a steel column that rests on a concrete footing the area of the bearing plate used is generally

greater than the cross-sectional area of the column

The stirrups in a reinforced concrete beam are used to

increase the strength of the beam in shear

the allowable stress in a material is generally

less than its ultimate stress

In relation to its compressive strength the tensile strength of concrete is

much lower

What is the yield stress of grade 60 reinforcing steel?

none of the above

The primary purpose of ties in a reinforced concrete column is to

prevent the buckling of vertical reinforcement in the column

Modulus of Elasticity refers to how

stiff a material is

When we determine the strength of concrete using the test specimens, we determine the concrete's

ultimate compressive stress

A material that is weak in tension is

weak in bending

A material that is weak in tension is

weak in shear

The bearing strength of a material is closely related to its

Compressive Strength

Which of the following beam cross sections is structurally more efficient in bonding

I-section

The primary purpose of longitudinal steel bars in a reinforced concrete beam is to overcome the weakness of concrete in tension

True

The stress-strain diagram of mild steel is nearly a straight line up to the yield point

True

Which of the following beam cross sections is structurally more efficient in bending

Tubular section

In a suspension bridge which member is in compression

support pylon


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