Civil Engineering Reference
In-Depth Information
Table 3
-
12 Threshold Torsion (Continued)
Beamwidthh(in.)
Max.
Slab
widthb
f
(in.)
slab
thicknessh
f
(in.)
Beam
depthh
(in.)
12
16
20
24
28
32
36
T
u
ftͲkips
T
u
ftͲkips
T
u
ftͲkips
T
u
ftͲkips
T
u
ftͲkips
T
u
ftͲkips
T
u
ftͲkips
A
cp
2
/p
cp
A
cp
2
/p
cp
A
cp
2
/p
cp
A
cp
2
/p
cp
A
cp
2
/p
cp
A
cp
2
/p
cp
A
cp
2
/p
cp
8
12
12
552
22
781
31
1022
40
1272
50
1529
60
1791
71
2057
81
35
49
64
81
97
115
132
16
16
879
1241
1630
2039
2463
2900
3347
20
20
1217
48
1724
68
2274
90
2860
113
3474
137
4110
162
4766
188
24
24
1563
62
2219
88
2941
116
3716
147
4534
179
5389
213
6275
248
76
108
143
182
222
265
310
28
28
1912
2723
3622
4594
5628
6715
7847
32
32
2264
90
3233
128
4313
170
5489
217
6747
267
8076
319
9467
374
103
147
197
252
311
374
440
36
36
2595
3725
4994
6384
7878
9464
11130
40
40
2856
113
4160
164
5636
223
7263
287
9020
357
10893
431
12868
509
44
44
3120
123
4602
182
6292
249
8164
323
10196
403
12369
489
14669
580
134
200
275
359
451
549
653
48
48
3386
5051
6960
9086
11402
13888
16526
9
12
12
542
21
36
51
66
81
96
112
127
138
149
774
31
51
71
93
114
136
158
180
198
1018
40
66
94
122
151
180
210
240
266
292
1272
50
83
117
153
190
228
1532
61
100
142
186
232
279
326
374
421
468
1797
71
117
167
220
275
332
390
448
2066
82
135
194
256
321
388
457
526
597
671
16
16
910
1280
1676
2091
2521
2962
3413
20
20
1283
1803
2366
2962
3586
4232
4896
24
24
1664
2341
3081
3872
4706
5575
6474
28
28
2050
2888
3812
4807
5863
6970
8120
32
32
2440
3442
4554
5760
7046
8401
9817
266
304
340
377
36
36
2831
4000
5304
6726
8249
9861
11552
40
40
3224
4561
6061
7701
9467
11343
13317
44
44
3492
5009
6721
8607
10645
12819
507
567
15114
216
48
48
3762
5461
7393
9531
11852
14336
16967
10
12
12
517
20
749
30
994
39
1248
49
1509
60
1774
70
2043
81
16
16
929
37
1305
52
1706
67
2126
84
2560
101
3006
119
3460
137
53
74
96
120
145
171
198
20
20
1336
1868
2441
3048
3680
4334
5006
24
24
1754
69
2449
97
3205
127
4012
159
4860
192
5742
227
6653
263
86
120
158
198
240
285
331
28
28
2178
3041
3988
5005
6080
7206
8374
32
32
2607
103
3641
144
4783
189
6017
238
7329
290
8709
344
10148
401
36
36
3038
120
4245
168
5587
221
7043
278
8599
340
10242
405
11962
473
137
192
253
319
391
466
546
40
40
3470
4854
6397
8080
9885
11798
13808
44
44
3905
154
5465
216
7212
285
9124
361
11183
442
13373
529
15679
620
167
236
313
399
491
589
694
48
48
4219
5962
7926
10086
12421
14912
17545
For spandrel beam integral with a slab, torsion can be neglected if:
(
)
2
bh
+
b
f
h
f
T
u
<φ ʹ
f
c
(see Table 3-11 for b
f
and h
f
)
(
)
2h
+
b
+
b
f
A simplified sizing equation to neglect torsion effects can be derived based on the limiting factored torsional
⎛
A
cp
p
cp
⎞
moment . Total moment transferred from slab to spandrel = 0.3M
0
, (ACI 13.6.3.3) permits
T
u
=φ ʹ
f
c
⎜
⎟
⎝
⎠
taking the torsional loading from a slab as uniformly distributed along the member. If the uniformly distrib-
uted torsional moments is t
u
:
0.3M
o
t
u
=
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