BẢNG TÍNH CỐT THÉP SÀN LOẠI BẢN KÊ 4 CẠNH
Cấp bền BT :
4
Rb = 14.5
Kích thước
STT Sơ đồ sàn
1
2
3
4
5
9
9
9
9
9
Cốt thép Ø ≤ 8
1
Rs=Rsc= 225
ξR= 0.618
αR= 0.427
Cốt thép Ø > 8
3
Rs=Rsc= 365
ξR= 0.563
αR= 0.405
Tải trọng
Chiều dày
l1
l2
g
p
h
a
h0
(m)
(m)
(N/m 2 )
(N/m 2 )
(mm)
(mm)
(mm)
20.0
80.0
20.0
80.0
20.0
80.0
20.0
4.00 4.25
4.00 4.00
4.00 4.00
4.00 4.25
4.25 4.25
6300
6300
9730
9550
9760
0
0
0
0
0
100
100
100
100
100
Tỷ số
l2/l1
Hệ số
moment
Tính thép
Moment
(N.m/m)
mmin = 0.10%
TT
αm
ζ
Chọn thép
CH
H.lượng
Ø
aTT
aBT
(cm 2 /m)
mTT (%)
(mm)
(mm)
(mm)
(cm 2 /m)
mBT (%)
As
As
H.lượng
α1 = 0.0189
M1 =
2,022
0.024 0.988
1.14
0.14%
8
442
200
2.51
0.31%
α2 = 0.0169
M2 =
1,805
0.022 0.989
1.01
0.13%
8
496
200
2.51
0.31%
β1 = 0.0440
MI =
-4,715
0.056 0.971
1.66
0.21%
10
472
200
3.93
0.49%
80.0
β2 = 0.0389
MII =
-4,161
0.050 0.974
1.46
0.18%
10
537
200
3.93
0.49%
20.0
80.0
α1 = 0.0179
M1 =
1,804
0.022 0.989
1.01
0.13%
8
496
200
2.51
0.31%
20.0
80.0
α2 = 0.0179
M2 =
1,804
0.022 0.989
1.01
0.13%
8
496
200
2.51
0.31%
20.0
80.0
β1 = 0.0417
MI =
-4,203
0.050 0.974
1.48
0.18%
10
532
200
3.93
0.49%
20.0
80.0
β2 = 0.0417
MII =
-4,203
0.050 0.974
1.48
0.18%
10
532
200
3.93
0.49%
20.0
80.0
α1 = 0.0179
M1 =
2,787
0.033 0.983
1.57
0.20%
8
319
200
2.51
0.31%
20.0
80.0
α2 = 0.0179
M2 =
2,787
0.033 0.983
1.57
0.20%
8
319
200
2.51
0.31%
20.0
80.0
β1 = 0.0417
MI =
-6,492
0.078 0.959
2.32
0.29%
10
339
200
3.93
0.49%
20.0
80.0
β2 = 0.0417
MII =
-6,492
0.078 0.959
2.32
0.29%
10
339
200
3.93
0.49%
20.0
80.0
α1 = 0.0189
M1 =
3,064
0.037 0.981
1.73
0.22%
8
290
200
2.51
0.31%
20.0
80.0
α2 = 0.0169
M2 =
2,736
0.033 0.983
1.55
0.19%
8
325
200
2.51
0.31%
20.0
80.0
β1 = 0.0440
MI =
-7,147
0.086 0.955
2.56
0.32%
10
306
200
3.93
0.49%
20.0
80.0
β2 = 0.0389
MII =
-6,307
0.076 0.961
2.25
0.28%
10
349
200
3.93
0.49%
20.0
80.0
α1 = 0.0179
M1 =
3,156
0.038 0.981
1.79
0.22%
8
281
200
2.51
0.31%
20.0
80.0
α2 = 0.0179
M2 =
3,156
0.038 0.981
1.79
0.22%
8
281
200
2.51
0.31%
20.0
80.0
β1 = 0.0417
MI =
-7,351
0.088 0.954
2.64
0.33%
10
298
200
3.93
0.49%
1.06
1.00
1.00
1.06
1.00
Kích thước
l2
STT Sơ đồ sàn l1
5
4.25 4.25
9
1
6
10
11
12
11
9
9
9
9
9
9
(m)
(m)
4.00 4.25
4.25 4.25
2.85 3.58
4.00 4.00
4.25 4.25
6.00 8.50
Tải trọng
g
9760
(N/m 2 )
6300
6300
7950
9080
11390
11454
p
0
(N/m 2 )
0
0
0
0
0
0
Chiều dày
h
100
(mm)
100
100
100
100
100
150
a
h0
(mm)
(mm)
20.0
80.0
20.0
80.0
20.0
80.0
20.0
80.0
20.0
Tỷ số
l2/l1
1.00
Hệ số
moment
Tính thép
Moment
(N.m/m)
TT
αm
ζ
Chọn thép
TT
BT
CH
H.lượng
Ø
(cm 2 /m)
mTT (%)
(mm)
(mm)
(mm)
(cm 2 /m)
mBT (%)
As
a
a
As
H.lượng
β2 = 0.0417
MII =
-7,351
0.088 0.954
2.64
0.33%
10
298
200
3.93
0.49%
α1 = 0.0179
α2 = 0.0179
M1 =
2,037
0.024 0.988
1.15
0.14%
8
439
200
2.51
0.31%
M2 =
2,037
0.024 0.988
1.15
0.14%
8
439
200
2.51
0.31%
MI =
-4,745
0.057 0.971
1.67
0.21%
10
469
200
3.93
0.49%
80.0
β1 = 0.0417
β2 = 0.0417
MII =
-4,745
0.057 0.971
1.67
0.21%
10
469
200
3.93
0.49%
20.0
80.0
α1 = 0.0207
M1 =
1,677
0.020 0.990
0.94
0.12%
8
534
200
2.51
0.31%
20.0
80.0
α2 = 0.0132
M2 =
1,070
0.013 0.994
0.80
0.10%
8
628
200
2.51
0.31%
20.0
80.0
β1 = 0.0473
MI =
-3,833
0.046 0.977
1.34
0.17%
10
584
200
3.93
0.49%
20.0
80.0
β2 = 0.0301
MII =
-2,439
0.029 0.985
0.85
0.11%
10
926
200
3.93
0.49%
20.0
80.0
α1 = 0.0179
M1 =
2,601
0.031 0.984
1.47
0.18%
8
342
200
2.51
0.31%
20.0
80.0
α2 = 0.0179
M2 =
2,601
0.031 0.984
1.47
0.18%
8
342
200
2.51
0.31%
20.0
80.0
β1 = 0.0417
MI =
-6,058
0.073 0.962
2.16
0.27%
10
364
200
3.93
0.49%
20.0
80.0
β2 = 0.0417
MII =
-6,058
0.073 0.962
2.16
0.27%
10
364
200
3.93
0.49%
20.0
80.0
α1 = 0.0179
M1 =
3,683
0.044 0.977
2.09
0.26%
8
240
200
2.51
0.31%
20.0
80.0
α2 = 0.0179
M2 =
3,683
0.044 0.977
2.09
0.26%
8
240
200
2.51
0.31%
20.0
80.0
β1 = 0.0417
MI =
-8,579
0.103 0.946
3.11
0.39%
10
253
200
3.93
0.49%
20.0
80.0
β2 = 0.0417
MII =
-8,579
0.103 0.946
3.11
0.39%
10
253
200
3.93
0.49%
20.0
130.0
α1 = 0.0210
M1 =
12,248
0.056 0.971
5.98
0.46%
10
131
120
6.54
0.50%
28.0
122.0
α2 = 0.0105
M2 =
6,114
0.031 0.984
2.26
0.19%
6
125
120
2.36
0.19%
20.0
130.0
β1 = 0.0472
MI = -27,553
0.125 0.933
2.00
0.15%
10
393
200
3.93
0.30%
1.06
1.00
1.25
1.00
1.00
1.42
Kích thước
l2
STT Sơ đồ sàn l1
11
6.00 8.50
9
1
9
(m)
(m)
4.00 4.25
Tải trọng
g
11454
2
(N/m )
6300
p
02
(N/m )
0
Chiều dày
h
150
(mm)
100
a
h0
(mm)
(mm)
20.0
130.0
Tỷ số
l2/l1
1.42
Hệ số
moment
(N.m/m)
β2 = 0.0234
1.06
Tính thép
Moment
MII = -13,689
TT
αm
ζ
0.062 0.968
Chọn thép
TT
BT
CH
H.lượng
Ø
(cm 2 /m)
mTT (%)
(mm)
(mm)
(mm)
(cm 2 /m)
mBT (%)
4.83
0.37%
8
104
100
5.03
0.39%
As
a
a
As
H.lượng