International Building Code 1804.1
Design. The presumptive load-bearing values provided
in Table 1804.2 shall be used with the allowable stress design
load combinations specified in Section 1605.3.
International Building Code 1804.2
Presumptive load-bearing values. Themaximumallowable
foundation pressure, lateral pressure or lateral sliding-resistance
values for supporting soils near the surface shall not exceed
the values specified in Table 1804.2 unless data to substantiate
the use of a higher value are submitted and approved.
Presumptive load-bearing values shall apply to materials
with similar physical characteristics and dispositions.
Mud, organic silt, organic clays, peat or unprepared fill shall
not be assumed to have a presumptive load-bearing capacity
unless data to substantiate the use of such a value are submitted.
Exception: A presumptive load-bearing capacity is permitted
to be used where the building official deems the
load-bearing capacity of mud, organic silt or unprepared fill
is adequate for the support of lightweight and temporary
structures.
International Building Code 1804.3
Lateral sliding resistance. The resistance of structural
walls to lateral sliding shall be calculated by combining the values
derived from the lateral bearing and the lateral sliding resistance
shown in Table 1804.2 unless data to substantiate the use
of higher values are submitted for approval.
For clay, sandy clay, silty clay and clayey silt, in no case shall
the lateral sliding resistance exceed one-half the dead load.
Increases in allowable lateral sliding resistance.
The resistance values derived from the table are permitted to
be increased by the tabular value for each additional foot
(305 mm) of depth to a maximum of 15 times the tabular
value.
Isolated poles for uses such as flagpoles or signs and
poles used to support buildings that are not adversely
affected by a 0.5 inch (12.7 mm) motion at the ground surface
due to short-term lateral loads are permitted to be
designed using lateral-bearing values equal to two times the
tabular values.
International Building Code 1804.3.1
Increases in allowable lateral sliding resistance.
The resistance values derived from the table are permitted to
be increased by the tabular value for each additional foot
(305 mm) of depth to a maximum of 15 times the tabular
value.
Isolated poles for uses such as flagpoles or signs and
poles used to support buildings that are not adversely
affected by a 0.5 inch (12.7 mm) motion at the ground surface
due to short-term lateral loads are permitted to be
designed using lateral-bearing values equal to two times the
tabular values.