modellazione del comportamento ultimo di pile da ponte ... - ReLUIS
modellazione del comportamento ultimo di pile da ponte ... - ReLUIS
modellazione del comportamento ultimo di pile da ponte ... - ReLUIS
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Materiali e Approcci Innovativi per il Progetto in Zona Sismica e la Mitigazione <strong>del</strong>la Vulnerabilità <strong>del</strong>le Strutture<br />
CONFINAMENTO DEL CALCESTRUZZO<br />
• Mo<strong>del</strong>lo <strong>di</strong> Mander-Priestley-Park (1988) fcc<br />
/ fc<br />
σ<br />
ε<br />
c<br />
cc<br />
fcc<br />
x r<br />
=<br />
r −1+<br />
x<br />
r<br />
ε<br />
x =<br />
ε<br />
[ 1+<br />
5( f f 1)<br />
]<br />
= 0.002<br />
−<br />
cc<br />
c<br />
c<br />
cc<br />
r =<br />
E<br />
sec<br />
E<br />
c<br />
f<br />
=<br />
ε<br />
Ec<br />
− E<br />
cc<br />
cc<br />
sec<br />
f<br />
l2<br />
/ f<br />
c<br />
f<br />
l1<br />
/ f<br />
c<br />
f cc<br />
• Mo<strong>del</strong>lo <strong>di</strong> Shams-Saadeghvaziri (1999) – mo<strong>del</strong>lo analitico <strong>di</strong> genesi numerica (analisi FEM)<br />
f<br />
σ<br />
cc<br />
=<br />
f<br />
c<br />
+ A f<br />
c<br />
⎡<br />
⎢1<br />
+<br />
⎢⎣<br />
⎛<br />
⎜<br />
⎝<br />
a + bx + cx<br />
D t<br />
B<br />
α<br />
⎞<br />
⎟<br />
⎠<br />
+ dx<br />
⎤<br />
⎥<br />
⎥⎦<br />
−1<br />
+ ex<br />
2 3 4 5<br />
= f c cc<br />
2 3 4 5<br />
1+<br />
gx + hx + ix + jx + kx<br />
+<br />
A<br />
− 24.477<br />
= 1.335<br />
e<br />
f c B = 47 .492 + 206. 85 fc<br />
fx<br />
ε<br />
x =<br />
ε<br />
c<br />
cc<br />
ε<br />
cc<br />
= ε<br />
c0<br />
⎡ ⎛ D t ⎞<br />
⎢1<br />
+ 3.51⎜<br />
⎟<br />
⎢⎣<br />
⎝ 60 ⎠<br />
−α<br />
⎤<br />
⎥<br />
⎥⎦<br />
α = 4<br />
a, b, c, d, e, f, g, h, i, j, k<br />
<strong>da</strong> analisi <strong>di</strong> regressione<br />
• Mo<strong>del</strong>lo <strong>di</strong> Susantha-Ge-Usami (2001) – mo<strong>del</strong>lo analitico <strong>di</strong> genesi teorica (SHS-RHS)<br />
1.46<br />
0.85<br />
4.0<br />
*<br />
1. 03<br />
f<br />
cc<br />
= fc<br />
+ f<br />
f<br />
rp<br />
* c<br />
6.5<br />
0. 12<br />
b 12 ( 1− ν<br />
2<br />
) f<br />
y<br />
f<br />
rp<br />
= − R + fc<br />
R =<br />
≤ 0.85<br />
f<br />
y<br />
t 4π2<br />
Es<br />
ramo crescente<br />
ramo <strong>di</strong>scendente<br />
fcc<br />
x r<br />
σc<br />
=<br />
r<br />
σ<br />
c<br />
= fcc<br />
− Z ( εc<br />
− εcc<br />
)<br />
Z = 23400 R ( f c<br />
f<br />
y<br />
) − 91.26 ≥ 0<br />
r −1+<br />
x<br />
L. Mastrandrea, V. Piluso: “Mo<strong>del</strong>lazione <strong>del</strong> Comportamento Ultimo <strong>di</strong> Pile <strong>da</strong> Ponte <strong>del</strong> tipo CFT”<br />
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