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Low spectral response value Ss yielding small seismic forces in Hawaii

Low spectral response value Ss yielding small seismic forces in Hawaii

Low spectral response value Ss yielding small seismic forces in Hawaii

(OP)
Under the IBC 2003, seismic base shears are based on maximum considered earthquake ground motion for one-second and short spectral responses, S1 and Ss.  Typically in Southern California, Ss is on the order of 1.4.  In Hawaii the value is 0.178, resulting in a base shear of only 4% gravity. This seems ridiculously low.  Can anyone confirm a similar design value for a Hawaii job?

Many thanks.

RE: Low spectral response value Ss yielding small seismic forces in Hawaii

Depends where you are.  Ss values can be 2.67 near the active volcanoes on the island of Hawaii.  A value of 0.19 would apply at Barking Sands on Kauai.

RE: Low spectral response value Ss yielding small seismic forces in Hawaii

(OP)
Thank you.  I did a comparison to the UBC, which yields 6% gravity for the base shear.  I did not realize that parts of Hawaii had the equivalent of a UBC Zone 1 seismicity.  

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