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2.1.1 Aseismatic measures
The provisions specified in seismic design except for calculation of earthquake action and calculation of resistance，including the constructional measure for earthquake resistance.
2.1.2 Aseismatic precaution The engineering and non-engineering precautionary measures taken for various structures against the possible earthquake hazard based on the specified reliability requirements.
2.1.3 Aseismatic precautionary criterion
A rule that is used to measure the aseismatic precautionary requirements and determined based on the aseismatic precautionary intensity or design ground motion parameters and aseismatic precautionary categories of the structures.
2.1.4 Aseismatic precautionary intensity
A seismic intensity that is approved by the related national administration authorities and used as a basis to determine the aseismatic precautionary rating for an area.Normally，the seismic intensity with a 10% probability of exceedance in 50 years is taken.
2.1.5 Aseismatic appraisal
The safety assessment that is made for the existing facilities under earthquake action by examining the design，construction quality and current state of the existing facilities in accordance with the aseismatic precautionary requirements.
2.1.6 Aseismic strengthening
The aseismatic design and construction made to enable the existing structures to attain the aseismatic qualification requirements.
2.1.7 Earthquake action The dynamic action of the structure due to earthquake ground motion，including horizontal earthquake action and vertical earthquake action.
2.1.8 Earthquake action effect
The internal stress（shear stress，bending moment，axial stress and torsional moment，etc.） or deformation （linear displacement and angular displacement，etc.） of the structure generated by the seismic action.
2.1.9 Design basic acceleration of earthquake ground motion
The design acceleration of ground motion with a 10% probability of exceedance in 50 years.