Table L

Table L.1 Typical frictional resistances

Materials

Frictional resistance,(In situ concrete base on sand

0.6

In situ concrete base on clay

a

Precast concrete on steel

0.3

Timber on timber, fibres parallel to the motion

0.4

Timber on timber, fibres at 90 to the motion

0.5

Metal on timber

0.2

Metal on metal

0.15 to 0.2

Timber on stone

0.4

Metal on masonry

0.3 to 0.5

Masonry on masonry (hard)

0.2 to 0.3

Masonry on masonry (soft)

0.4 to 0.6

Well lubricated hard smooth surfaces (bearings)

0.05

a Frictional resistance unreliable therefore use cohesion only.