Distributed loads applied over given areas on the boundary of the semi-infinite soil/solid 3, 4, 5. Another axisymmetric problem common in soil mechanics and foundation engineering is the problem of finding stress fields and displacements due to uniformly distributed loads applied over circular foundation areas. In this case.
Nonuniform distributed loads such as a nonuniform body force in the -direction can be defined by means of user subroutine DLOAD in ABAQUS/Standard (see “DLOAD,” Section 25.2.5) or VDLOAD in ABAQUS/Explicit (see “VDLOAD,” Section 25.3.1). When an amplitude reference is used with a nonuniform load defined in user subroutine VDLOAD, the current value of the amplitude function is passed to the user subroutine at each time increment in the analysis. DLOAD and VDLOAD are not available for surface tractions, edge tractions, or edge moments.
In ABAQUS/Standard nonuniform distributed surface tractions, edge tractions, and edge moments can be defined by means of user subroutine UTRACLOAD (see “UTRACLOAD,” Section 25.2.41). User subroutine UTRACLOAD allows you to define a nonuniform magnitude for surface tractions, edge tractions, and edge moments, as well as nonuniform loading directions for general surface tractions, shear tractions, and general edge tractions.
Nonuniform distributed surface tractions, edge tractions, and edge moments are not currently supported in ABAQUS/Explicit.