Chiou and Youngs PEER-NGA Empirical Ground Motion Model for ...

Chiou and Youngs PEER-NGA Empirical Ground Motion Model for ... Chiou and Youngs PEER-NGA Empirical Ground Motion Model for ...

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-5 -4 -3 -2 -1 0.01 0.05 0.10 0.50 1.00 5.00 10.00 Period (sec) Figure 31: Variation of parameter c1 with spectral period. Number of Usable Data 400 600 800 1000 0.01 0.05 0.10 0.50 1.00 5.00 10.00 Period (sec) 0.8 1.1 1.6 Figure 32: Variation of number of usable recordings as a function of spectral period. C&Y2006 Page 43 4 8

Slope -1.5 -1.0 -0.5 0.0 0.5 1.0 0.01 0.05 0.10 0.50 1.00 5.00 10.00 Period (sec) Figure 33: Variation of the derivative of parameter c1 with respect to spectral period. FINAL MODEL FORMULATION The final model formulation is given by the relationships: ln ( SA ) = c + c F + c F + c ( Z − 4) ln 1130ij + c + c + 1 ( ) 2 3 cn ( cM −M i ) ( M − 6) + ln 1+ e ( R + c cosh( c ( M − c , 0) ) ) ( c − c ) ⎪⎧ + ⎨c ⎪⎩ + c 2 4 9 ln 4a γ 1 + τ ⋅ z i 1a i ⋅ cos RVi RUPij 4 ln⎜ ⎝ + cosh ( SA ) = ln( SA ) ij 2 1130ij 1b c 5 ⎛ 2 R RUPij + γ 2 ( M − c , 0) ) i n NMi − c c c γ 3 ⎛ R δ i ⋅ tanh ⎜ ⎝ 2 6 RUPij 7 c i 2 RB max ⎞ ⎟ tan ⎠ TORi ⎟⎞ ⎠ C&Y2006 Page 44 HM ⎪⎫ ⎬ ⋅ R ⎪⎭ −1 RUPij 0.8 max 1.1 1.6 ⎛ Wi cosδ i ⎜ ⎝ 2 TORi ( Z + 1) 4 ⎞ 1 ⎪⎧ ⎟ ⎨1 − ⎠ π / 2 ⎪⎩ R ⎛ ⎛V S 30ij ⎞ ⎞ + φ ⎜ ⎟ ⎜ ⎜ ⎟ 1 ⋅ ln , 0 ⎟ ⎝ ⎝ 1130 ⎠ ⎠ min φ ( ( V ) ) ( ) ⎛ SA S ij − ij + φ ⎞ 3 30 , 1130 360 φ − 1130 4 min 3 1130 360 + φ ⋅ { e − e } ⋅ ⎜ ⎟ 2 ln ⎝ φ4 ⎠ + σ ⋅ z ij The predictor variables for this model are: 8 RUPij RJBij ⎪⎫ ⎬ + 0. 001⎪⎭ (21a) (21b)

-5 -4 -3 -2 -1<br />

0.01 0.05 0.10 0.50 1.00 5.00 10.00<br />

Period (sec)<br />

Figure 31: Variation of parameter c1 with spectral period.<br />

Number of Usable Data<br />

400 600 800 1000<br />

0.01 0.05 0.10 0.50 1.00 5.00 10.00<br />

Period (sec)<br />

0.8<br />

1.1<br />

1.6<br />

Figure 32: Variation of number of usable recordings as a function of spectral period.<br />

C&Y2006 Page 43<br />

4<br />

8

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