Earthquake Engineering Flashcards
It is the space between two adjacent floors
Story
Are rigid horizontal planes used to transfer lateral forces to vertical resisting elements
Diaphragms
Refers to a wall designed to resist lateral forces acting in its own plane, typically wind and seismic loads; Stiffened walls are capable of transferring lateral forces from floors and roofs to the foundation.
Shear Wall
Refers to the point where the object “suffers” no torque by the effect of the gravitational force acted upon it.
Center of gravity
Refers to the center of resistance of a floor or diaphragm against lateral forces; It is the point through which the resultant of the resistance to the applied lateral force acts.
Center of rigidity
Refers to the point through which the resultant of the masses of a system acts. It is the point through which the applied lateral force acts.
Eccentricity
Refers to the total design lateral force at the base of a structure.
Design seismic base shear
Refers to the lateral displacement of one level relative to the level above or below.
Story drift
refers to the lateral displacement of the story relative to the base
Story displacement
Refers to the discontinuities in a lateral force path
Out-of-plane offsets
Refers to the shear stress that occurs when the structure’s center of mass does not coincide with its center of rigidity
Torsional shear stress
Refers to the phenomenon that occurs when a building period coincides with the earthquake period.
Resonance
Refers to the time period of undamped free vibration of a structure.
Natural period
Refers to the rate at which natural vibration is absorbed.; The effect of internal friction, imperfect elasticity of material, slipping, sliding, etc in reducing the amplitude of vibration
Damping
Refers to the geographical point on the surface of earth vertically above the focus of the earthquake
Epicenter
Refers to the origin/source of the elastic waves inside the earth which cause shaking of ground due to earthquake.
Focus
Refers to the capacity to undergo large inelastic deformations without significant loss of strength or stiffness.
Ductility
Refers to the state in saturated cohesionless soil wherein the effective shear strength is reduced to negligible value; condition when soil tends to behave like a fluid mass.
Liquefaction
Refers to the measure of the strength of shaking during the earthquake
Intensity
Refers to the measure of energy released in an earthquake.
Magnitude
Refers to the instrument used to record the motion of the ground during an earthquake.
Seismograph
Refers to the condition in which the lateral stiffness is less than 70 percent of that in the storey above or less than 80 percent of the average lateral stiffness of the three storeys above.
Soft Storey Irregularity
Rrefers to the condition is one in which the storey lateral strength is less than 80 percent of that in the storey above.
Weak Storey Irregularity
