PSAD TERMS

Question 1

Plastic range without breaking

Answer 1

Ductility

Question 2

Deforms even with slight increase.

Answer 2

Yielding

Question 3

Regains original dimensions when load is removed.

Answer 3

Elasticity

Question 4

Refers to flexibility of a structure.

Answer 4

Inverse/Reciprocal Stiffness

Question 5

Refers to rigidity of a structure.

Answer 5

Inverse/Reciprocal of Deflection

Question 6

Composite material, elastic properties in one direction different from perpendicular direction.

Answer 6

Orthotropic

Question 7

Same composition but elastic properties may not be the same in all direction.

Answer 7

Homogenous

Question 8

Material, same elastic properties in all direction.

Answer 8

Isotropic

Question 9

Stressing high strength steel wires before concrete hardens.

Answer 9

Pre Tensioning

Question 10

Stressing high strength steel after the concrete has been casted.

Answer 10

Post Tensioning

Question 11

Loss of stress that takes place with passage of time.

Answer 11

Relaxation

Question 12

Retarding force acting opposite a body of motion.

Answer 12

Kinetic Friction

Question 13

Structure member, ratio of unsupported weight to least lateral dimension, not less than 3, supported axial load.

Answer 13

Column

Question 14

Force determines the body will be in equilibrium.

Answer 14

Resultant

Question 15

Stress is proportional to the strain within elastic region.

Answer 15

Hooke’s Law

Question 16

In deformation of axially loaded member, the ratio of lateral to the longitudinal strain is constant.

Answer 16

Poisson’s Ratio

Question 17

Elastic range constant of proportion defines linear relationship between stress and strain.

Answer 17

Young’s Modulus

Question 18

Force generated by body at rest.

Answer 18

Static

Question 19

Force generated by body at motion.

Answer 19

Dynamic

Question 20

Value which stress is no longer proportional to the strain.

Answer 20

Proportional Limit

Question 21

Proportion of material enables to under large permanent strains before failure.

Answer 21

Ductility

Question 22

Total composite spring constant.

Answer 22

k1 + k2

Question 23

Spring constant in series.

Answer 23

K1*K2 / K1 + K2

Question 24

Stress of failure

Answer 24

Rupture Strength

Question 25

Highest ordinate in stress-strain diagram.

Answer 25

Ultimate Strength

Question 26

Elongation/yielding without cut any corresponding increase of load.

Answer 26

Yield Strength

Question 27

Displacement of one level relative to the level above/below.

Answer 27

Storey Drift

Question 28

Center of mass and rigidity do not coincide.

Answer 28

Torsional Shear Stress

Question 29

Causes the beam to have sudden ultimate fracture.

Answer 29

Fatigue

Question 30

Measured by Ritcher scale

Answer 30

Magnitude of Earthquake

Question 31

Measured by seismometer

Answer 31

Ground Displacement

Question 32

Describes location of the eearthquake

Answer 32

Focal Depth

Question 33

Sudden drop in the shear strength of a soil.

Answer 33

Liquefaction

Question 34

Point which applied lateral or resultant.

Answer 34

Center of Rigidity

Question 35

Point which applied seismic force acts.

Answer 35

Center of Mass

Question 36

Which lateral stiffness less than 70% of the story above?

Answer 36

Soft Storey

Question 37

Distance between center of rigidity and center of mass.

Answer 37

Eccentricity

Question 38

Absorb energy in plastic range.

Answer 38

Toughness

Question 39

Absorb energy in elastic range.

Answer 39

Resilience