Quantitative Chapter 4
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 on the column?
.0025
What is the yield stress of A36 steel?
36 ksi
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
concrete is
an elastic material
Which gives greater warning before failure?
A ductile Material
The test specimen used for determining the compressive strength of concrete in the U.S 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 stress is the same (True or False)
False
Which of the following beam cross sections is structurally more efficient in bending? Rectangular (Solid) Section or I - section?
I-section
In a suspension bridge, which members are in compression
Support Pylons
The primary purpose of longitudinal steel bars in a reinforced concrete beam is to overcome the weakness of concrete in tension (True or false)
True
The stress-strain diagram of mild steel is nearly a straight line up to the yield point True or False?
True
Which of the following beam cross-sections is structurally more efficient in bending? Rectrangular (Solid) Section or tubular section?
Tubular Section
The bending stresses 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
Low carbon (mild steel) is
an elastic-plastic material
the horizontal blocking in 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 thea area of the bearing plate used is generally
greater than the cross sectional area of the column
Modulus of elasticity refers to ____
how stiff a material is
the stirrups in a reinforced concrete beam are used to
increase the strength of 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 vertical reinforcement in column
the units if modulus of elasticity are
psi, ksi, Pa, GPa
In a typical srress-strain diagram of a material the stress is generally plotted along the vertical axis True or False?
true
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