TR
-----------------------------
N
KHÁNH
Chuyên ngành:
60.58.02.08
GS.
1
.. 1
.. 2
..............................................................................................................3
..3
4
4
4
5.
4
.......7
....................................7
1.2.
..........................................................................8
.......................................................................8
....................................................................9
...................................................................................13
GI
..........................................14
......................................................................................................14
............................................15
..............................................................................15
...................................................................................17
.............................21
.............................................................................22
.............................................27
....................................................................................29
......................................................................................................31
...................................................................................33
:
........................34
2
[3]........................................................................................................................34
.................................................34
..................................................................................................................34
3.2.
........................................................................................54
...............................................................................56
..................................................................................56
................56
3.4.2.
.............56
3.4.3.
...................................................................................................57
(Hình 3.7).............59
.........59
..............................................................................60
........................................................................................61
......................................................................62
3
, công trình
-
không
4
có p
2.
:
-
3.
:
,
nhau.
4.
:
-
5. C
:
L
b
phá
5
3.2.
Cách dùng ng
6
1.1. Khái
.
c Pth
t.
-
E
E qd
7
(Pqd )
En
.
(1.2)
E
Eqd
Er
iE
1.2
Eqd
.
.
8
E,
khá
.
(1.3)
1.2.2.
.
.
L
(1.4)
.
trong tính toán sau này.
9
:
-
.
-
Hay
(1.6)
-
.
Hay
(1.7)
-
(1.8)
hay:
d
ij
d (
ij
ij
)
1
3v
d
2G 1 v
10
ij
(1.9)
trong
(1.10)
-R
:
:
:
(1.11)
:
-
11
Hay là:
(1.13)
-
(1.14)
Hay là:
và
.
12
ông
d
.
13
.
.
ái cân
:
.
.
x; y; w
14
àng
(2.1)
và:
(2.2)
(2.3)
biên:
2.2.
.
xx
p,
b
(2.4)
15
Wp (T )
trong
Suy ra:
nh
F(T)
(2.5)
(2.6)
thì
(2.5)
16
(2.7)
h
Ngoài ra:
(2.8)
1
.
a
.
17
(2.9)
:
:
Vì
khác 0 nên:
18
.
i = a/h
60
0.5
E(MN/m2)
Et(MN/m2)
2
Pth(MN/m )
2.0x105
1.85x105
230.89
.
X
Xé
xx
x = 0, x = a.
b>a
w=w(x).
:
xx
=xx
=-p
=
= -1;
yy
19
=
=0
=0
không
:
:
x = 0, x = a,
w = 0,
:
Pth = Po
Po =
K
E(MN/m2) Et (MN/m2) pth(MN/m2)
i = a/h
31
32
0.5
0.5
2.0x105
2.0x105
1.83x105
1.93x105
vuông góc nhau.
a và b
h
p.
20
225.02
216.26
xx
= -p,
yy
= -p,
xy
i = b/h
= 0.
EMN/m2)
Et (MN/m2)
pth(MN/m2)
a=b
44
0.5
2.0x105
1.85x105
106.68
a = 2b
70
0.5
2.0x105
1.85x105
108.95
=
eu =
u
21
Sx=
Sy =
Sxy =
Sx=
Sy =
Sxy =
i
.
u
và kíc
Hình 2.4
22
, eu
, eu
:
:
(2.13)
=
= 0)
SW
(2.14)
23
,
z
0
yên cho ta:
trình
z > z0:
z < z0:
thái:
a) Tr
24
z < z0
b)
-h/2
z0
z0
z0
2
(2.17)
:
(2.18)
25