Civil Engineering Reference
In-Depth Information
The developable tensile stress is (ACI 440.1R-06 Equation 11-3)
fpsi
′ ⋅
≥
1
c
1
c
emb3
f_bar
b3
f_bar
emb3
f_bar
f f
⋅
13 6
⋅
⋅
φ
+
φ
⋅
φ
+
340
f
fu
fu
α
Neg3
f
:
=
fd13
fpsi
′ ⋅
1
c
1
c
emb3
b3
emb3
⋅
13 6
⋅
⋅
φ
+
φ
⋅
φ
+
340
otherwise
α
Neg3
f_bar
f_bar
f_bar
f
fd13
= 64·ksi
“Bar ultimate strength”iff
≥
f
fd13
fr3
CheckFailure3 :
=
“Bond strength” therwise
CheckFailure3 = “Bar ultimate strength”
The cross section of interest is not a bond-critical section and adequate
moment capacity can be achieved.
Ultimate bending moment diagram—Exterior bay:
Exterior bay 1-foot
slab strip, ft:
Ultimate Bending Moment Diagram - Exterior Bay
2
542.4
308.2
1
3
74.1
-160
-394.2
-628.3
0
6
12
18
24
30
Exterior Bay 1-Foot Slab Strip, ft
Section
1
Section
2
Section
3
M
u1
=
145.4
kip
ft
φ
bond
M
nnew
= 205kipft
M
u2
=
271
2
kip
ft
φ
b2
M
n2
= 504kipft
M
u3
=
349.1
kip
ft
φ
b3
M
n3
= 563kipft
7.7 STEP 5—CHECK CREEP-RUPTURE STRESS
7.7.1
Case 1—Exterior support
Creep-rupture stress in the FRP has to be evaluated considering the total
unfactored dead loads and the sustained portion of the live load (20% of
the total live load).
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