Civil Engineering Reference
In-Depth Information
Problem 6.4
For the beam in Example 6.1, design the shear strengthening required if
w
u
= 7 k/ft
and the existing shear stirrups are #4 @ 10" c/c. See Figure 6.P.3.
12"
w
u
= 7 k/ft
19.75"
d
fv
= 15.75"
22"
28 ft
f
c
= 4 ksi
f
yt
= 50 ksi
t
f
= 0.0065"
E
f
= 33000 ksi
f
fu
= 550 ksi
FIGURE 6.P.3
Problem 6.5
Khalifa and Nanni (2000) tested a deficient T-beam in shear (BT5) after strength-
ening it in shear using CFRP sheets. This strengthened beam had no steel stirrups
and transverse CFRP side strips of 50-mm width at 125 mm on center extending the
entire web height along the clear span. The geometric and material parameters of the
beams are given in Figure 6.P.4.
P/2
P/2
380 mm
1070 mm
200
1070 mm
100 mm
2 φ 13
305 mm
2 φ 28
50 mm side strips at 125 mm c/c
2340 mm
150 mm
Beam BT5
FIGURE 6.P.4
f
c
= 35 MPa,
f
y
= 470 MPa for ϕ28-mm bars, and
f
y
= 350 MPa for ϕ13-mm
and ϕ10-mm bars
CFRP sheet:
f
fu
= 3790 MPa,
E
f
= 228 GPa,
t
f
= 0.165 m m
Check the ultimate shear capacity of BT5 and compare it with the actual ultimate
shear strength of 121.5 kN.
Problem 6.6
Al-Sulaimani et al. (1994) tested a reinforced concrete beam (JO) deficient in shear
and strengthened in shear using GFRP U-jackets covering more than the entire shear
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