
271
b
y,
'
– z, h
1
h . ,
z x.
, z.
0
,
1
,
m m
m x.
N F. N
1
, F .
( ) (
0
0
)
0
N
0
F
0
. N
0
,
0
0
0
.
b
0
N
0
y, R
0
N
0
F
0
N
0
.
0
= 90 – ( + ),
– x.
0
( 1%)
,
= 90 – ( + ). (3.69)
, .
,
( bb
),
b – ,
:
l – ,
(3.70)
, l ,
. h b.
,
, (, )
.
,
v
cos = v
, (3.71)
– .
()
v
=v
/ (Kcos ), (3.72)
– , =
0,90–0,99.