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PSAD TERMS 1
| Term | Definition |
|---|---|
| Actual Displacement | It is measured by a Seismometer |
| Aeolotropic | Materials that has its properties different in various directions. |
| Cambering | This method is used to control the deflection of reinforced concrete with long span members. |
| Center of mass | It is the point through which the applied lateral force acts. |
| Center of Mass | It is the point through whivh the applied Seismic force acts. |
| Center of rigidity | It is the point through which the resultant of the resistance to the applied lateral force acts. |
| Center of Rigidity | It is the point through which the resultant of the resistance to the applied lateral force acts. |
| Column | Which structtural member has a ratio of its unsupported height to its least lateral dimension of not less than 3 and is used primarily to support Axial Load? |
| Creep | Strains developed in addition when materials are loaded for a long period of time. |
| Creep | If the structure is subjected to a load for a long period of time, it will continue to deform until a sudden fracture occurs. |
| Ductility | The ability of the material to undergo large inelastic deformation without fracture. |
| Ductility | The material deforms in the Plastic Range without breaking. |
| Ductility | The material has the ability to defuse the plastic range without breaking. |
| Ductility | Which property of a material enables it to undergo large permanent strains before failure |
| Dynamic | Which terms refers to the force generated by a body in motion? |
| Eccentricity | It is the distance between the center of rigidity and center of mass. |
| Elasticity | Property of a material which makes it return to its original dimension when the load is remove |
| Elasticity | The material regains its original dimensions when the load is removed |
| Fatigue | Strains developed when the material is loaded multiple times at a stress below its elastic limit. |
| Fatigue | If the structure is subjected to a cycle of stresses and ______, it causes the beam to have sudden ultimate failiure. |
| Fatigue | This refers to the stresses much lower than the static breaking strength. |
| Focal Depth | Besides the epicenter, it decribes the location of the earthquake. |
| Ground Displacement | Which of the following is measured by a seismometer? |
| Homogeneous | Materials having the same composition at any point. |
| Homogenous | The material has the same composition at every point but the elasticity may not be the same in all directions. |
| Homogenous | Which material has the same composition at any point |
| Homogenous | Materials which have the same composittion at any point are described as |
| Hooke's Law | Identify the principle used in equations related to the deformation of axially loaded materials where the stress is proportional to the strain within the Elastic Region. |
| Internal Force | What refers to the force that holds part of the rigid body together? |
| Inverse of Stiffness | Which of the following refers to the flexibility of a structure? |
| Isotropic | Materials having the same properties in all directions. |
| Kinetic Friction | What do you call the retarding force acting opposite a body in motion |
| Lateral Drift | A lateral displacement of one level relative of the level above or below is called ____ |
| Magnitude of Earthquake | It is measured by the Richter Scale |
| Microcrack | These are cracks that are too fine and seen by the naked eye. |
| Modulus of Elasticity | The slope of the initial straight-line portion of the stress-strain diagram. |
| Orientation Angle | In mohr’s circle which of the following terms defined as the inclined or slope surface of the plane? |
| Orthotropic | The composite material exhibits elastic properties in one direction different from that in the perpendicular direction. |
| Plastic Flow | Happens when large deformations occur in a ductile material which is loaded into the plastic region. |
| Plasticity | The characteristics of a material by which it undergoes inelastic strains beyond the strain at the elastic limit. |
| Plasticity | A condition that when there is already a permanent deformation, it continues to deform when a minimal laod is applied beyond the elastic range. |
| Poisson’s Ratio | The ratio of the transverse strain to the longitudinal strain |
| Poisson's Ratio | Identify the principle used in equations related to the deformation of axially loaded materials where in the deformation of axially loaded members, the ratio of the lateral to the longitudinal strain is constant. |
| Post Tensioning | Stressing high strength steel wires after the concrete has been cast and has attained sufficient strength. |
| Pre Tensioning | Stressing high strength steel wires before concrete hardens. |
| Proportional limit | The term for the value above which the stress is no longer proportional to the strain. |
| Reciprocal of Deflection | Which refers to the rigidity of a structure? |
| Reciprocal of Stiffness | It refers to the flexibility of a structure. |
| Relaxation | Loss of stress that takes place with the passage of time as concrete is held at a constant strain. |
| Resilience | It is the ability of a material to absorb energy when it is deformed elastically, and release that energy upon unloading. Its modulus can be calculated by integrating the stress-strain curve from zero to the elastic limit. |
| Resilience | The material has the ability to absorbe energy in the Elastic Range. |
| Resonance | Refers to the large amplitude vibration of an object or system when given impulses at its natural frequency. |
| Resultant | What do you call the force which determines whether the body will be in equilibrium or will have a varying state of motion. |
| Shear Modulus | The ratio of shearing stress to shearing strain during the initial elastic behavior. |
| Shearing strain | It is the angular change between two perpendicular faces of a differential element. |
| Soft story | One in which the lateral stiffness is less than 70% of the stiffness of the story above is called |
| Static | Which term refers to the force generated by a body at rest? |
| Story drift | It is the displacement of one level relative to the level above or below. |
| Strain | It refers to the deformation of the member per unit length. |
| Strain Hardening | It is the strengthening of a material by plastic deformation. This strengthening occurs because of dislocation movements and dislocation generation within the crystal structure of the material. |
| Tensile Strength | The largest unit stress that the material achieves in a tension test. |
| Torsional Shear Stress | Occurs when the center of mass and rigidity do not coincide |
| Toughness | It is the ability of a material to absorb energy and plastically deform without fracturing. |
| Toughness | The material has the ability to absorbe energy in the Plastic Range. |
| Weldability | The ability of steel to be welded without changing its basic mechanical properties. |
| Working stress | Is is determined merely by dividing either the stress at yield or the ultimate stress by a number termedthe safety factor. |
| Yield Stress | It is that unit tensile stress at which the stress-strain curve exhibits a well-defined increase in strain without an increase in stress. |
| Yielding | The material deforms considerably even with the slight increase in stress |
| Young's Modulus | Identify the principle used in equations related to the deformation of axially loaded materials where within the elastic range, it is the constant of proportionality that defines the linear relationship between stresses and strain. |
| Toughness | Amount of energy per unit volume that a material can absorb before rupturing. |
| Toughness | It is defined as the material’s resistance to fracture when stressed. It requires a balance of strength and ductility. |
Created by:
engrjustine