GB 500011-2001 Code for Seismic Design of Buildings
2. Terms and signs.
2.1.1 Seismic fortification intensity
The seismic intensity ratifies according to jurisdiction regulated by the state as a criterion of local seismic design.
2.1.2 Seismic fortification criterion
A measurement of the demand of seismic prevention and insulation, decide by the seismic fortification intensity and the function of buildings.
2.1.3 Earthquake action
Structure movement caused by earthquake, including horizontal action and vertical action.
2.1.4 Design parameters of ground motion
Seismic acceleration time curve (velocity and displacement), acceleration response spectrum and peak acceleration used in seismic design.
2.1.5 Design basic acceleration of ground motion
Fifty year of design reference period with the 10% of earthquake acceleration speed.
2.1.6 Design characteristic period of ground motion
The periodic quantity used in earthquake influence coefficient curve to show the descending branch and initial point of earthquake magnitude, eptcentral distance, and site category.
The location of the constructions, with similar response spectrum characteristics. The stretch is like a factory, community or natural village, no smaller than 10k m2.
2.1.8 Seismic concept design of buildings
The process of conducting general layout and decide detailed constitution of the building or framework according to the seismic damage and project experience.
2.1.9 Seismic fortification measures
Seismic deign other than the calculation of earthquake action and resistance force, including details of seismic design
2.1.10 details of seismic design
Seismic fortification measures accords to the principles of seismic conceptual design. Usually, there is no need to do calculations for the detail requirements of components of the structure and nonstructures.
2.2 Main Signs
2.2.1 Action and action effect
FEk, FEvk--- horizontal and vertical earthquake action standard of the structure
GE, Geq --- the representative value of gravity load coefficient and the equivalent representative coefficient of total gravity load
ωk--- wind loading normal value
SE---earthquake action effect (bending moment, axial force, shearing force and stress and deformation)
S---the basic combination of earthquake action effect and other load effect
Sk--- effect and load normal value effect
V--- shearing force