An example employing smeared crack model in ABAQUS documentation cannot converge?

 Dear all:
    I recently find an example in ABAQUS documentation cannont convergence.
    The parametres related with the iteration of the Risk method is 

arc length  initial increment    minmum increment  maximum increment  maximum number 
 1                0.0001                1E-10              1E+36       100000
    The location of the exmaple in ABAQUS documentation is Abaqus Example Problems Manual->1 Static Stress/Displacement Analyses->1.1 Static and quasi-static stress analyses-> 1.1.5Collapse of a concrete slab

The .inp file named as collapseconcslab_s8r.inp in the documentation is as follows:

*HEADING
 CORNER SUPPORTED TWO-WAY SLAB TESTED
BY MCNEICE 
*NODE
 1,0.,0.
 7,18.,0.
 61,0.,18.
 67,18.,18.
*NGEN,NSET=Y-SYM
 1,7
*NGEN,NSET=X-SYM
 1,61,10
*NGEN,NSET=LX2
 61,67
*NGEN,NSET=LY2
 7,67,10
*NSET,NSET=ONE
1,
*NFILL
X-SYM,LY2,6,1
*ELEMENT,TYPE=S8R,ELSET=SLAB
 1,1,3,23,21,2,13,22,11
*ELGEN,ELSET=SLAB
  1,3,2,1,3,20,3
*SHELL SECTION,ELSET=SLAB,MATERIAL=A1
 1.75,9
*REBAR LAYER
YY,0.014875, 1.0, -0.435,SLABMT,90,1
XX,0.014875, 1.0, -0.435,SLABMT,0,1
*MATERIAL,NAME=A1
*ELASTIC
 4.15E6,.15
*CONCRETE
 3000.,0.
 5500.,.0015
*FAILURE RATIOS
1.16 , .0836
*TENSION STIFFENING
1.,0.
0.,2.E-3
*MATERIAL,NAME=SLABMT
*ELASTIC
 29.E6,
*PLASTIC
 50.E3,
*BOUNDARY
 Y-SYM,YSYMM
 X-SYM,XSYMM
 67,3
*RESTART,WRITE,FREQUENCY=999
*STEP
*STATIC,RIKS
.05,1.,,,,1,3,-1.
*CLOAD
 1,3,-5000.
*EL PRINT,FREQUENCY=10
S,
SINV,
E,
PE,
CRACK,
*EL FILE,FREQUENCY=10
S,
SINV,
E,
PE,
CRACK,
*OUTPUT,FIELD,FREQ=10
*ELEMENT OUTPUT
S,
SINV,
E,
PE,
*ELEMENT OUTPUT,REBAR
S
*NODE FILE,NSET=ONE
U,
*OUTPUT,FIELD
*NODE OUTPUT,NSET=ONE
U,
*END STEP

Thanks with best regards

Jarivis Yang