PSAD

Question 1

The ability of the material to deform under tensile stress.

Answer 1

ductility

Question 2

The ability of a material to absorb energy when it is deformed elastically and release that energy upon loading.

Answer 2

resilience

Question 3

The ability of a material to absorb energy and plastically deform without fracturing.

Answer 3

toughness

Question 4

When a material is subjected to repeated cycle of stress or strain, what cause its structure to breakdown ultimately leading to fracture?

Answer 4

fatigue

Question 5

When a material has to support a load for a long period of time, what causes it to continue to deform until a sudden fracture occurs?

Answer 5

creep

Question 6

In what condition is a material when it breaks down and deforms permanently even due to a slight increase in stress above the elastic limit?

Answer 6

plasticity

Question 7

It occurs when a building period coincides with the earthquake period.

Answer 7

resonance

Question 8

It refers to the displacement of one level relative to the level above or below.

Answer 8

story drift

Question 9

It occurs when the structure’s center of mass does not coincide with its center of rigidity.

Answer 9

torsional shear stress

Question 10

Besides the epicenter, it describes the location of an earthquake.

Answer 10

focal depth

Question 11

It is measured by a seismometer.

Answer 11

actual displacements

Question 12

It is measured by Richter’s scale.

Answer 12

magnitude of an earthquake

Question 13

The material has the same composition at every point but the elastic may not be the same in all directions.

Answer 13

homogenous

Question 14

The composite material exhibits elastic properties in one direction different from that in the perpendicular direction.

Answer 14

orthotropic

Question 15

The material has the same elastic properties in all directions.

Answer 15

isotropic

Question 16

The material returns to its original shape when the load is removed.

Answer 16

elasticity

Question 17

The material deforms considerably even with a slight increase in stress.

Answer 17

yielding

Question 18

The material undergoes changes in its structure resulting in increased resistance to further deformation.

Answer 18

strain hardening

Question 19

Stressing high strength steel wires before the concrete hardens.

Answer 19

pre-tensioning

Question 20

Stressing high strength steel after the concrete has been cast and has attained sufficient strength.

Answer 20

post-tensioning

Question 21

Loss of stress that takes place with the passage of time as concrete is held at a constant strain.

Answer 21

relaxation

Question 22

Branch of mechanics which studies the effects and distribution of forces of rigid bodies which are and remain at rest.

Answer 22

statics

Question 23

This principle states that the external effect of a force on a rigid body is the same for all points of application along its line of action.

Answer 23

principle of transmissibility

Question 24

The “Slenderness Ratio” of the column is generally defined as the ratio of its:

Answer 24

unsupported length to its minimum radius of gyration

Question 25

It is the point in the cross-section of the beam through which the plane of the transverse bending loads must pass so that the beam will bend without twisting.

Answer 25

shear center

Question 26

In this point in bolted connections, the shear stress due to moment alone is equal in magnitude and opposite the direction of the shear stress due to force alone.

Answer 26

instantaneous center

Question 27

The ratio of the stress of an elastic material to the strain.

Answer 27

modulus of elasticity

Question 28

The ratio of the lateral strain to that of the linear strain is known as

Answer 28

Poisson’s Ratio

Question 29

The maximum amount of strain energy that can be stored in a certain material without causing a permanent set is known as

Answer 29

modulus of resilience

Question 30

A localized buckling type of a failure of the web of a steel beam or girder usually resulting from a concentrated load at that point is known as

Answer 30

web crippling