Abstract
The economic losses left by large recent earthquakes are still considerable, and modern society is wanting not only life protection; it is also demanding that buildings can be immediately occupied after a strong earthquake. The performance-based seismic design allows engineers to design structures with a desired seismic performance for a specified level of hazard. This requires a high standard in the different items involved in the seismic design. One of the key factors is associated with the seismic loads, which are strongly dependent on the local ground conditions. Accordingly, an alternative seismic site classification is proposed, which is based on two dynamic parameters of the ground: the equivalent shear wave velocity, VS30-E, that reproduces the dynamic lateral stiffness of the upper 30 m of the ground, and the predominant period of the site, which is proposed to be estimated applying the H/V spectral ratio of ambient vibration measurements. All the details of this site classification are explained in the paper.
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