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Earthquake and Kominka

Earthquake and Kominka

A talk for the Kominka summit 2024 in Hanase near Kyoto about the experience of securing our old house against earthquakes.

Uberto Barbini

April 23, 2024

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  1. Traditional seismic performance evaluation index: C When using the traditional

    seismic performance evaluation system, the traditional seismic performance evaluation index C of a building is calculated using the natural period T(s), Q value, and maximum amplitude response magnification R of a typical conventional small-scale building, as defined by the following formula. Here, for conventional small-scale buildings, the minimum equivalent standard natural period To is 0.1 sec, and for buildings with traditional construction methods that are "flexible structures" with fewer structural walls than these, the minimum equivalent standard natural period Tt is considered to be 0.2 sec, which is appropriate based on the data from previous research results.
  2. Recommendations This building exhibits the characteristics of a flexible structure,

    which is a characteristic of traditional construction methods, with an average of 2.5 in the north-south direction and an average of 2.5 in the east-west direction at the points where the natural vibration form is largest. However, since the next largest natural vibration type is found in the area between 7.0 and 8.0, it is possible that the building was originally built using traditional construction methods, but was later renovated and constructed using conventional frame construction methods. Because of this, the building has a mixed structure. Overall, the structure has strong characteristics of traditional construction methods, so we recommend abrasion-resistant reinforcement methods using old folk house heavy-duty panel-type lattice walls, old folk house seismic dampers, etc.