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8.5 PROBLEMS
8.1 A tension member is connected to the flange of a
W shape column through a WT stub and two vertical rows of 1-in. A325 bolts,
as shown in Fig. 8.32. The maximum tensile force in the member is 200 K.
Find the minimum required number of bolts assuming the connection to be
slip critical. Also, assume that holes are standard size, that threads are
excluded from the shear plane, and that the tensile force passes through
the centroid of bolts.
8.2 A built-up beam is made of four L8x6x1 angles and two PL40x½ bolted together as shown in Fig. 8.33.
Type of steel is A36 steel with yield stress of 36 ksi and an ultimate
stress of 58 ksi. Using 1-in. A325 bearing-type bolts, find the spacing of
the bolts along the length of the
beam for a shear force of V = 450
K. Assume that threads are excluded from the shear planes.
8.3 The web of a W27x114 beam is connected to the flange of a W14x120 column through two L4x4x½ and A325 slip critical
bolts, as shown in Fig. 8.34. Four 1-in.-diameter bolts are used to connect
the angles to the beam web, and ten 7/8-in.-diameter bolts are used to
connect the angles to the column flange. Neglecting the eccentricity, find
the shear capacity of the connection. The column, the beam, and the angles
are made of A36 steel with yield stress of 36 ksi.
8.4 Solve Problem 8.3, using bearing-type
connections with threads excluded from the shear plane.
8.5 In Problem 4.2, find the maximum tension
capacity of the connection on the basis of the strength of bolts for the
following cases:
a.
A325 bolts and slip critical connection
b.
A325 bolts and bearing-type connection, assuming that threads are
excluded from the shear planes.
c.
A325 bolts and bearing-type connections, assuming that threads are
not excluded from the shear plane.
d.
A490 bolts and slip critical connection.
e.
A490 bolts and bearing-type connection, assuming that threads are
excluded from the shear planes.
f.
A490 bolts and bearing-type connections, assuming that threads are
not excluded from the shear plane.
8.6 Solve Example 2 of this chapter, assuming that
the bottom channel is C12x25 instead of C12x30.
8.7 Solve Example 3 of this chapter, assuming that
the force P = 50 K makes an angle
of 45 degrees with the horizontal (to the right).
8.8 Two 1-in.-thick plates made of A36 steel with
yield stress of 36 ksi are connected through fillet weld as shown in Fig.
8.35. Find the maximum force F
that can be applied to the connection when ½-in. submerged arc welding and
E60 electrode are used.
8.9 A welded built-up girder is made of a WT12x81 and a C10x30, as shown in Fig. 8.36. The maximum
shear force in the girder is 100 K. Design the continuous fillet weld for
connecting the two sections. Use E70 electrodes and
a.
shielded metal arc welding (SMAW)
b.
submerged arc welding (SAW)
8.10 Solve Problem 8.9, but
use intermittent fillet weld with maximum spacing
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