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9.14 PROBLEMS
9.1 Design a simply supported welded hybrid plate
girder subjected to a distributed load of intensity 3.5 K/ft including the
girder weight and a concentrated load of 400 Kips at a distance of 50 ft
from the left support, as shown in Fig. 9.50. The girder has lateral
supports at the two ends and at points D, E, and F, as indicated on the
figure. Double plates are used for intermediate stiffeners. Use A36 steel
with yield stress of 36 ksi for the web plate and stiffeners and A572 steel
with yield stress of 60 ksi for the flange plate. Use E70 electrode and
shielded metal arc welding (SMAW) for connecting various plates.
9.2 A simply supported welded plate girder has a
span of 200 ft and is subjected to a uniform load of 4 Kips/ft including
its own weight. The girder is laterally supported at the supports and at
the midspan. Based on a preliminary design, a 180 in.x0.75 in. plate is selected for the web,
and a 40 in.x1.5 in. plate is
selected for each flange. Using A36 steel with yield stress of 36 ksi and
considering the bending stresses in the flange only, check the adequacy of
this preliminary design.
9.3 Design the intermittent web-to-flange fillet
weld for the hybrid girder designed in Sec. 9.9 of the book, using
submerged arc welding (SAW) and E70 electrode. Use the minimum weld size
and minimum length for the intermittent fillet segments.
9.4 Solve Example 1 of section 9.10, assuming that
the plate girder consists of two WT12x52 with yield stress of
60 ksi and a 100 in. x 0.50 in. plate with
yield stress of 36 ksi.
9.5 Design the bearing stiffeners in Example 1 of
Sec. 9.10.
9.6 Design the intermediate stiffeners in Example 1
of Sec. 9.10, using
a. single stiffeners
b. double stiffeners
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