DESIGN SPECIFICATIONS FOR HIGHWAY BRIDGES - IISEE
DESIGN SPECIFICATIONS FOR HIGHWAY BRIDGES - IISEE
DESIGN SPECIFICATIONS FOR HIGHWAY BRIDGES - IISEE
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mesh)<br />
D50: Mean grain diameter (mm)<br />
8.2.4 Reduction of Geotechnical Parameters<br />
(1) When a soil layer is considered to be an extremely soft layer according to the<br />
provisions specified in Section 8.2.2, its geotechnical parameters (shear modulus<br />
and strength) shall be assumed to be zero in the seismic design.<br />
(2) For a sandy layer causing liquefaction and affecting a bridge according to the<br />
provisions of Section 8.2.3, geotechnical parameters in the seismic design shall be<br />
reduced in accordance with the liquefaction resistance factor FL.<br />
Geotechnical parameters of a sandy layer causing liquefaction and affecting a bridge<br />
shall be equal to the product of geotechnical parameters obtained without liquefaction<br />
and coefficient DE in Table 8.2.1. In the case of DE = 0, geotechnical parameters (shear<br />
modulus and strength) shall be taken as 0 in the seismic design.<br />
Table 8.2.1 Reduction Factor DE for Geotechnical Parameters<br />
Range of F L<br />
F L ≦1/3<br />
1/3
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