, akiyoshi@kumamoto-u.ac.jp uchida@as.yatsushiro-nc.ac.jp matsu@kumamoto-u.ac.jp 9t1533@eng1.stud.kumamoto-u.ac.jp F NUW Fig.1 - - N 5 3m 1995 L-3mNSU max.1,, 5., 1m/s - - - max=.1m/s JR Fig. Fig.1 (Fig.1/Fig.)Fig.3 F Fig. 1 Map around Kobe 5. ~ 5.5 5. ~ 5.7 5. ~ 5.9. ~.1. ~.3. ~.5 Fig. istributions o JM s newly scaled seismic intensity 1. 1. JR 阪神高速道路 Fig. 3 Seismic intensity ratios
LOL ONNRION RRISIS OF RQUK RSPONS OF KO ROUN 1 3 1 akashi kiyoshi, ept. o ivil ngrg., Kumamoto Univ., akiyoshi@kumamoto-u.ac.jp Kunihiko Fuchida, ept. o ivil and rch. ngrg., Yatsushiro ollege o ech., uchida@as.yatsushiro-nct.ac.jp 3 idetoshi Matsumoto, Faculty o ngrg.,kumamoto Univ., matsu@kumamoto-u.ac.jp iroyuki Maruno, rad. School o Sci. and ech., Kumamoto Univ., rad. Stud., 9t@eng1.stud.kumamoto-u.ac.jp SUMMRY his study aims to investigate the mechanism o local concentration o acceleration and strain responses near the ground surace, using the response characteristics o Kobe ground or the 1995 yogoken-nanbu earthquake. Numerical results by the eective stress analysis program show that distributions o newly scaled seismic intensity or numerical analysis results are close to those by JM s previous scale and distributions o maximum surace strain to those o damaged sites o buried pipelines. : Key words: Local eect, nergy concentration, Kobe ground, Liqueaction, Illegularly piled ground 1 1995 1) F- - - - Fig. 1 1995 1km 3km ) Fig. Fig. 1 1 N 5 3m 11111F111 333F333 F 55 555F5 F
1995 L-3mNS U Fig. 3 max.1,, 5. 1m/s F NUW 3), ) (m/s/s) 加速度波形 - - (m/s/s) 加速度波形 - - Fig. 1 Map around Kobe 1) 3m (N=3) 3 (N=1) 5 (N=3) 1 m (N=3) (N=5) 3 (N=1) 5 (N=3) m 1 15m フーリエスペクトル (gal sec) - 1 1 1 1 1 IM (sec) 5 フーリエスペクトル 3 1 1.1 1 1 振動数 (z) フーリエスペクトル (gal sec) - 1 1 1 1 1 IM (sec) 5 フーリエスペクトル 3 1 1.1 1 1 振動数 (z) Fig. 3 1995 yogoken-nanbu earthquake at Port Island m 5m - (N=3) 5 (N=3) (N=1) 1 (N=3) 3m m - (N=3) m 5 (N=3) 1 (N=3) m iot 5) ) iot arcy L σ + ρb = p + ρ b = ρ u + (ρ ρu + ρ w 1 /n) w + w /k 35m 7m - 3 (N=1) (N=1) 5 (N=5) (N=) 1 19m - (N=5) 3 (N=1) (N=5) 1m 35m m - F5 (N=5) F (N=1) F (N=5) F3 (N=1) F1 15m F- 3 (N=1) (N=3) m (N=5) 3m 1 19m - 19m 35m 1 175m - 3.5m Fig. Sample cross sections o Kobe ground
σ = ( σ, σ, σ, τ, τ, τ ) xx yy zz xy yz zx u = ( u, u, u ), w = ( w, w, w ) x y z x y z b = ( b, b, b ), = { / x, / y, / } x y z / x / y / L = / y / / / / y / x u w U w = n( u U) σ b p n ρ = ( 1 n)ρ + nρ ρ k s s ) S1, w1, p1, p, c 1 φ ρ m φ m NUW 3), ) p 最大応答加速度 (m/s/s) 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 max= m/s/s max=1m/s/s max= m/s/s max=1m/s/s IS N (m ) max= m/s/s max=1m/s/s max= m/s/s max=1m/s/s 1 1 Fig. Maximum response acceleration distributions 最大応答加速度 (m/s/s) 1 1 1 1 1 ISN (m ) 1 1 1 1 1 1 1 1 1 max= m/s/s max=1m/s/s max= m/s/s max=1m/s/s max= m/s/s max=1m/s/s 1 1 max= m/s/s max=1m/s/s 1 1 IS N (m ) (1) 7) max= m/s/s max=1m/s/s max= m/s/s max=1m/s/s max.1,, 5. 1m/s - - Fig. 5 Fig. max=.1 m/s max=5. 1m/s - - - max= m/s/s max=1m/s/s ISN (m ) max= m/s/s max=1m/s/s max= m/s/s max=1m/s/s ISN (m ) ISN (m ) ISN (m ) Fig. 5 Maximum excessive pore water pressure distributions max= m/s/s max=1m/s/s max= m/s/s max=1m/s/s max= m/s/s max=1m/s/s
Fig. 5 max > 5.m/s 1 - - - max Fig. max max=5.m/s, 1 sec Fig. 7 Fig. sec - - max=5.m/s 9).1 Fig. Fig. 1 Fig. 5 3 1 max=.1 m/s/s max= m/s/s max= 5. m/s/s max=1 m/s/s 5 3 1 max=.1 m/s/s max= m/s/s max= 5. m/s/s max=1 m/s/s ISN (m ) 5 3 1 max=.1 m/s/s max= m/s/s max= 5. m/s/s max=1 m/s/s ISN (m ) 5 3 1 max=.1 m/s/s max= m/s/s max= 5. m/s/s max=1 m/s/s ISN (m ) 5 3 1 Fig. Maximum shear strain distributions Fig. 7 Natural periods or max=5.m/s/s =. sec =1. sec = sec 1. =. sec =1. sec = sec =. sec =1. sec = sec =. sec =1. sec = sec 5 3 1 max=.1 m/s/s max= m/s/s max= 5. m/s/s max=1 m/s/s max=.1 m/s/s max= m/s/s max= 5. m/s/s max=1 m/s/s 5 3 1 ISN (m ) max=.1 m/s/s max= m/s/s max= 5. m/s/s max=1 m/s/s 5 3 1 ISN (m ) max=.1 m/s/s max= m/s/s max= 5. m/s/s max=1 m/s/s ISN (m ) =. sec =1. sec = sec =. sec =1. sec = sec =. sec =1. sec = sec =. sec =1. sec = sec
F 5. ~ 5.5 5. ~ 5.7 5. ~ 5.9. ~.1. ~.3. ~.5 Fig. istributions o JM s newly scaled seismic intensity ~ 5 ~ 1 11 ~ 15 1 ~ 1 ~ Fig. 1 istributions o shear strain 1. 1. 1. 1. 1. 1. Fig. 11 reas with break concentrations in Kobe city 1) 1. 1. Fig. 9 Seismic intensity ratios Fig. 1 istributions o damaged sites o sewerage pipes 11)
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