Chapter 4

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A 20-ft \- high column shortens by 0.6 in. under a load. what is the resulting strain in the column?

0.0025

A rectangular column measuring 12 in. X 12 in. in cross section carries a load of 18 kips. what is the stress in the column

125 psi

What is the yield stress of grade 60 reinforcing steel?

60,000 lb

The Material in an Arch is primarily in

Compression

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

Cylinder measuring 6 in. in diameter X 12 in. high

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

Either tension or compression

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

False

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

I-Section

In a suspension bridge, which member(s) is (are) in compression?

Support Pylons

In a typical stress-strain diagram ofa material, the stress is generally plotted along the verticle axis.

True

The primary purpose of longitudinal steel bats 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 a yiled point.

True

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

Tubular section

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

Zero

Which gives greater warning before failure?

a ductile material

Concrete is

an elastic material

Low-Carbon (mild) steel is

an elastic-plastic material.

The horizontal blocking in a wood studs helps prevent

buckling of studs

The bearing strength of a material is closely related to its

compressive strength

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

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

prevent the buckling of verticle reinforcement in the column

The units of modulus of elasticity are

psi, Pa, ksi, GPa

Modulus of elasticity refers to how

stiff a material is

When we determine the strength of concrete using the test specimens, we determine the concretes

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 bending stresses along the neutral axis of a beam are

zero


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