Issue 14

B. M

. Chiaia et alii

, Frattura ed In

tegrità Struttural

e, 14 (2010) 45

-51; DOI: 10.322

1/IGF-ESIS.14.0 5

For at t coh ado

simplicity, t he top of th esive behavi pted (see Eq

he condition e slab, have our has been ns. 1 – 5).

s of no horiz been conside considered

ontal displace red. An initi in the simula

ment at the al flaw was i tions, and th

lateral sides o mposed at on e dynamic va

f the slab, an e lateral sid lues of the f

d of no verti e of the slab racture param

cal displacem . The absenc eters have b

ent e of een

(a Figu

) re 2 : (a) Schem own fracture p lation of the and then r table fracture n conducted f crack arres inuous single tinuous line resence and obtained ana rresters (Fig. rpasses the s not enough a

(b) k with induce the snowpack crack arrest ly. The K I (Fig. 2). study the in ow cover. A arrester (with ters. In all th the crack ar ot of Stress I a little drop ween two pa re restarts its

(c)

e of snowpac ropagation on slab without otates slight propagation afterwards to ters in the sn linear crack ar crack arres the effects of lysing the pl 3). We note nowpack bet nd the fractu

d initial flaw o . (c) Plot of K ers was carrie value, depen fluence of d bout the latt width and l ese simulatio resters. ntensity Fac of the K ID w rallel rows o propagation

n the left bord ID vs. crack le d out. Crow ding on th ifferent starti er, we tested ength equal t ns, the crack tor vs. Crack hich indent f discontinuo .

er. ngth.

(b) Cr test, a simu tal direction dicating uns ons have bee rangements o ample a cont arallel discon ncelling the p ting result is near crack a e crack ove ck arrester is

As in

a preliminary the horizon notonically in eral simulati different ar esters: for ex a single and p pping and ca e first interes continuous li ture when th uence of cra

n fracture pr e fracture g ng position o different geo o : 2m x 5m overpasses t length in th ifies a tempo us crack arre

opagates init rowth, incre f the initial metries of cr and 0.1m x 5 he voids with e case of par rary stop of sters: the sp

ially ases flaw ack m), out allel the atial

mo Sev and arr or sto Th dis frac infl

(a)

(b)

Figure

racture propag crack arrester

ation on the s s; (b) Plot of K

nowpack with ID vs. crack

parallel discon length.

tinuous

3 : (a) Crown f linear

Th (Fig

e optimal con . 4a). In a m

dition (i.e. a odel slab (1

sharp decrea 00 m x 100 m

se of K I

, see ) with a cen

Fig. 4b), was tral area (30

obtained for m x 40 m) w

a quincunci eakened by

al crack arres the presence

ter configura of a quincun

tion cial

48