Page 24 - Handbook of Structural Steel Connection Design and Details

Fasteners and Welds for Structural Connections

Fasteners and Welds for Structural Connections 9

of the applied load when slip-critical connections are used. The short
1
1
7
5
slots for ⁄8- to ⁄8-in-diameter bolts are ⁄16 in larger in width and ⁄14 in
larger in length than the bolt diameter. For bolts 1 in in diameter, the
1
width is ⁄16 in larger and the length ⁄16 in larger and for bolts 1 ⁄8 in diam-
5
1
eter and larger, the slot will be ⁄16 in larger in width and ⁄8 in longer in
3
1
length.
Long slots have the same requirement as the short-slotted holes,
except that the long slot has to be in only one of the connected parts at
the faying surface of the connection. The width of all long slots for bolts
1
is ⁄16 in greater than the bolt diameter, and the length of the long slots
5
5
1
3
for ⁄8-in-diameter bolts is ⁄16 in greater, for ⁄4 -in-diameter bolts 1 ⁄8 in
5
greater, for ⁄8-in-diameter bolts 1 ⁄16 in greater, for 1-in-diameter bolts
7
1
1 ⁄2 in greater, and for 1 ⁄8-in-diameter and larger bolts, 2 ⁄2 times diam-
1
1
eter of bolt.
When finger shims are fully inserted between the faying surfaces of
load transmitting parts of the connections, this is not considered as a
long-slot connection.
1.2.7 Edge distances and spacing of bolts
Minimum distances from centers of fasteners to any edges are given in
Table 1.5.
The AISC specification has provisions for minimum edge distance: The
distance from the center of a standard hole to an edge of a connected part
should not be less than the applicable value from Table 1.5.
Maximum edge distances are set for sealing and stitch purposes. The
AISC specification limits the distance from center of fastener to nearest
TABLE 1.5 Minimum Edge Distances* (in) for Fastener Holes in
Steel for Buildings
Fastener At At rolled edges of plates,
diameter, in sheared edges shapes, or bars or gas-cut edges †
1 7 3
1 ⁄2 1 ⁄8 1 ⁄4
5 1 7
1 ⁄8 1 ⁄8 1 ⁄8
3 1 3
1 ⁄4 1 ⁄4 1 ⁄4
7 1 ‡ 1
1 ⁄8 1 ⁄2 1 ⁄8
3 3 ‡ 1
1 ⁄4 1 ⁄4 1 ⁄4
1 3 1
1 ⁄8 2 ⁄4 1 ⁄2
1 1 5
1 ⁄4 2 ⁄4 1 ⁄8
3
1
1 1 ⁄4 d § 1 ⁄4d §
Over 1 ⁄4
*Lesser distances are permitted if bolt edge tear-out is checked (J3.10).
All edge distances in this column may be reduced ⁄8 in when the hole is at
† 1
point where stress does not exceed 25 percent of the maximum allowed stress
in the element.
1
‡ These may be 1 ⁄4 in. at the ends of beam connection angles.
d = fastener diameter in.
§
SOURCE: From AISC “Specification for Structural Steel Buildings.”
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