DESIGN SPECIFICATIONS FOR HIGHWAY BRIDGES - IISEE
DESIGN SPECIFICATIONS FOR HIGHWAY BRIDGES - IISEE
DESIGN SPECIFICATIONS FOR HIGHWAY BRIDGES - IISEE
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T 2.01 ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ (6.2.1)<br />
where<br />
T : Natural period of the design vibration unit (s)<br />
δ : Lateral displacement of the superstructure at the height of the<br />
superstructural inertia force when 80% of the weight of the substructure<br />
above the design ground surface and the entire weight of the superstructure<br />
jointly act in the directions of their inertia forces (m)<br />
(3) When a design vibration unit consists of multiple substructures and their<br />
supporting superstructural part, natural periods shall be obtained by Equation<br />
(6.2.2).<br />
T 2.01 ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ (6.2.2)<br />
δ =<br />
<br />
<br />
w(<br />
s)<br />
u(<br />
s)<br />
2<br />
ds<br />
w(<br />
s)<br />
u(<br />
s)<br />
ds<br />
・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ (6.2.3)<br />
where<br />
T : Natural period of the design vibration unit (s)<br />
w(s ) :Weight of the superstructure or the substructure at position s (kN/m)<br />
u(s ) : Lateral displacement of each structure at position s in the direction of the<br />
inertia force when a lateral force equal to the sum of the weight of the<br />
superstructure and that of the substructure above the design ground surface<br />
act in the direction of the inertia force (m)<br />
Here, the symbol ∫ denotes the integral throughout the entire portion of the design<br />
vibration unit.<br />
16
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