DESIGN SPECIFICATIONS FOR HIGHWAY BRIDGES - IISEE
DESIGN SPECIFICATIONS FOR HIGHWAY BRIDGES - IISEE
DESIGN SPECIFICATIONS FOR HIGHWAY BRIDGES - IISEE
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design shall be assumed to be acting as an overburden.<br />
8.3 Verification of Seismic Performance of Foundations for<br />
Liquefaction-induced Ground Flow<br />
8.3.1 General<br />
(1) Ground with possible lateral movement<br />
A ground with both of the following two conditions shall be treated as a ground with<br />
possible lateral movement affecting a bridge.<br />
1) Ground within a distance less than 100 m from a water front in a shore area formed<br />
by a revetment with an elevation difference of 5 m or more between the water<br />
bottom and the ground surface behind.<br />
2) Ground with a sandy layer thicker than 5 m that is assessed as a liquefiable layer<br />
according to the provisions in Section 8.2.3 and is distributed somewhat widely in<br />
the area of the water front.<br />
(2) Verification of seismic performance of a bridge for liquefaction-induced ground flow<br />
A pier foundation situated on a ground specified in (1) above shall be verified against<br />
possible liquefaction-induced ground flow. In the verification, lateral movement force<br />
specified in Section 8.3.2 shall act on the pier foundation, and horizontal displacement<br />
at the top of foundation shall not exceed two times the horizontal displacement at<br />
yielding of the foundation described in Section 12.3. However, the lateral movement<br />
force and the inertia force need not be considered simultaneously.<br />
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