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The bearing capacity of soil is the maximum average contact pressure between the foundation and the soil which should not produce shear failure in the soil. Ultimate bearing capacity is the theoretical maximum pressure which can be supported without failure; allowable bearing capacity is the ultimate bearing capacity divided by a factor of ...
The procedure to calculate the ACN is as such: Design a theoretical pavement according to a defined criterion: For flexible pavements, design the pavement for 10,000 load applications of the aircraft according to the CBR design procedure combined with Boussinesq's solution for deflection in the elastic half-space
N = bearing speed. This is the maximum amount of revolutions per minute (RPM) that the bearing will move. The DN factor of a bearing is obtained by multiplying the median diameter (A + B)/2 by RPM, and sometimes by a correction factor. [2] [6] This correction factor may vary from manufacturer to manufacturer.
Allowable bearing stress is the bearing capacity divided by a factor of safety. Sometimes, on soft soil sites, large settlements may occur under loaded foundations without actual shear failure occurring; in such cases, the allowable bearing stress is determined with regard to the maximum allowable settlement.
Bearing pressure is a particular case of contact mechanics often occurring in cases where a convex surface (male cylinder or sphere) contacts a concave surface (female cylinder or sphere: bore or hemispherical cup). Excessive contact pressure can lead to a typical bearing failure such as a plastic deformation similar to peening.
The California Bearing Ratio (CBR) is a measure of the strength of the subgrade of a road or other paved area, and of the materials used in its construction. The ratio is measured using a standardized penetration test first developed by the California Division of Highways for highway engineering . [ 1 ]
This gives a clearer definition of the concept of bearing life, which is essential to calculate the correct bearing size. Life models can thus help to predict the performance of a bearing more realistically. The prediction of bearing life is described in ISO 281 [13] and the ANSI/American Bearing Manufacturers Association Standards 9 and 11. [14]
It causes a barreling effect (bulging at the centre) in ductile materials. This changes the specimen's geometry and affects its load-bearing capacity, leading to a higher apparent compressive strength. Various methods can be used to reduce the friction according to the application: