. Architect and engineer. FJs3. placed at eight to ten stories and so calledrigid buildings of this height have beenconstructed in Japan which have sustainedlittle or no earthquake damage. Even forthe case of such a building however, thereis a factor of uncertainty presented by thefoundation, since if this is on compressible soil, it has been found that the structurewill rock back and forth during the earth-quake motion, as indicated in Fig. 2. Thusthe upper portion of the structure does notmove with the ground and its accelerationis unknown, so that the forces acting uponit cannot be computed
. Architect and engineer. FJs3. placed at eight to ten stories and so calledrigid buildings of this height have beenconstructed in Japan which have sustainedlittle or no earthquake damage. Even forthe case of such a building however, thereis a factor of uncertainty presented by thefoundation, since if this is on compressible soil, it has been found that the structurewill rock back and forth during the earth-quake motion, as indicated in Fig. 2. Thusthe upper portion of the structure does notmove with the ground and its accelerationis unknown, so that the forces acting uponit cannot be computed. In as much as thescience of soil mechanics is in its infancya prophecy is probably dangerous but itnow seems very unlikely that the extent ofthis rocking motion will ever be a subjectof calculation. The obvious solution there-fore is to stiffen the foundation by the useof piles or caissons, so that the uncertaintypresented by this rocking motion will belargely eliminated. On the other hand suchcushioning action of the g
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