Design of a T-beam - Reinforced Concrete with FRP Bars: Mechanics and Design - page 244

1 2 3 4

A

AB-3

30 ft

B

30 ft

C

17 ft 20 ft 17 ft

Figure 7.1 Second-floor plan.

Table 7.1 Bending moments and shear forces

Bending moment Shear force

Moment
coefficient

Ultimate
moment (kip-ft)

Service
moment (kip-ft)

Shear
coefficient

Ultimate
shear (kip) Section

Exterior
support

1/24 145 111 1.0 62

Midspan 1/14 271 204 0.15 10

Interior
support

1/10 349 266 1.15 72

Total factored load for positive moments 4.88 kip/ft

Total factored load for negative moments 4.49 kip/ft

Service load for positive moments 3.64 kip/ft

Service load for negative moments 3.39 kip/ft

Bending moments and shear forces for beam AB-3 are computed at the sup-
port and midspan sections, as summarized in Table 7.1.
The design is limited to the first span (beam AB-3) because of symme-
try. The required FRP reinforcement for both flexure and shear is given in
Table 7.2, while Table 7.3 shows a summary of demands and capacities at
critical sections.
The final bar layout is selected to optimize rebar production time and
construction effort. Bar layout and typical details are shown in Figure 7.2(a)
a nd 7. 2(b).
Table 7.4 is provided to convert US customary units to the SI system.