DESIGN SPECIFICATIONS FOR HIGHWAY BRIDGES - IISEE
DESIGN SPECIFICATIONS FOR HIGHWAY BRIDGES - IISEE
DESIGN SPECIFICATIONS FOR HIGHWAY BRIDGES - IISEE
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6.4.6 Performance Verification for Reinforced Concrete Columns<br />
(1) Verification of Seismic Performance Level 2<br />
Reinforced Concrete single column piers and Reinforced Concrete single-story<br />
rigid-frame piers shall be verified according to Equations (6.4.6) and (6.4.7).<br />
k hc W ≦Pa ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ (6.4.6)<br />
δR ≦δR a ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ (6.4.7)<br />
where<br />
khc :Design horizontal seismic coefficient for Level 2 Earthquake Ground Motion<br />
specified in Section 6.4.3<br />
W : Equivalent weight (N) in the ductility design method obtained by Equation<br />
(6.4.8)<br />
W =WU + cpWp ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ (6.4.8)<br />
cp : Equivalent weight (N) coefficient determined from Table 6.4.3<br />
WU : Weight of the superstructural part supported by the pier concerned (N)<br />
WP : Weight of the pier (N)<br />
Pa : Lateral strength of an Reinforced Concrete Columns, calculated from Section<br />
10.2 (N)<br />
δR : Residual displacement (mm) of a pier, obtained by Equation (6.4.9)<br />
δR = cR (μr – 1 ) (1 – r )δy ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ (6.4.9)<br />
cR : Modification factor on residual displacement, a factor of 0.6 shall be taken for<br />
Reinforced Concrete Columns.<br />
r : Ratio of the secondary post-yielding stiffness to the yielding stiffness of a pier, a<br />
ratio of 0 shall be taken for Reinforced Concrete Columns<br />
δy : Yield displacement (mm) of piers, calculated by Section 10.3 for Reinforced<br />
Concrete Columns<br />
μr : Maximum response ductility ratio of piers, obtained by Equation (6.4.10)<br />
2<br />
1 <br />
<br />
c<br />
<br />
<br />
zk<br />
hcoW<br />
<br />
r=<br />
<br />
<br />
1<br />
・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ (6.4.10)<br />
2 Pa<br />
<br />
khc0: Standard value of the design horizontal seismic coefficient for Level 2<br />
Earthquake Ground Motion, specified in Section 6.4.3<br />
cz : Modification factor for zones specified in Section 4.4<br />
δRa : Allowable residual displacement (mm) of piers. δR shall be 1/100 times the<br />
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