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TR.31 Definition of Load Systems

This section describes the specifications necessary for defining various load systems, for automatic generation of Moving loads, UBC Seismic loads and Wind loads. In addition, this section also describes the specification of Time History load for Time History analysis.

STAAD.Pro has built-in algorithms to generate moving loads, lateral seismic loads, and wind loads on a structure. Use of the load generation facility consists of two parts:
  1. Definition of the load system(s).

  2. Generation of primary load cases using previously defined load system(s).

Definition of the load systems must be provided before any primary load case is specified. This section describes the specification of load systems. Information on how to generate primary load cases using the defined load systems is available in TR.32.12 Generation of Loads.

Note: UBC loads do not fully consider the effects of forces at inclined support directions or at dependent joint directions.  Applying forces at these locations may introduce errors that are generally small.