International Building Code Section 1911

International Building Code 1911.1

Scope. The provisions of this section shall govern the
allowable stress design of headed bolts and headed stud
anchors cast in normal-weight concrete for purposes of transmitting
structural loads from one connected element to the
other. These provisions do not apply to anchors installed in
hardened concrete or where load combinations include earthquake
loads or effects. The bearing area of headed anchors
shall be not less than one and one-half times the shank area.
Where strength design is used, or where load combinations
include earthquake loads or effects, the design strength of
anchors shall be determined in accordance with Section 1912.
Bolts shall conform toASTMA307 or an approved equivalent.

International Building Code 1911.2

Allowable service load. The allowable service load for
headed anchors in shear or tension shall be as indicated in Table
1911.2. Where anchors are subject to combined shear and tension,
the following relationship shall be satisfied:
(Equation 19-1)

International Building Code 1911.3

Required edge distance and spacing. The allowable
service loads in tension and shear specified in Table 1911.2 are
for the edge distance and spacing specified. The edge distance
and spacing are permitted to be reduced to 50 percent of the values
specified with an equal reduction in allowable service load.
Where edge distance and spacing are reduced less than 50 percent,
the allowable service load shall be determined by linear

International Building Code 1911.4

Increase in allowable load. Increase of the values in
Table 1911.2 by one-third is permitted where the provisions of
Section 1605.3.2 permit an increase in allowable stress for
wind loading.

International Building Code 1911.5

Increase for special inspection. Where special inspection
is provided for the installation of anchors, a 100-percent
increase in the allowable tension values of Table 1911.2 is permitted.
No increase in shear value is permitted.