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The STAAD.Pro 2007 Graphical User Interface (GUI) is normally used to create all input specifications and all output reports and displays (See the Graphical Environment manual). When the GUI does a File Open to start a session with an existing model, it gets all of its information from the STD file.

A user may edit/create this STD file and have the GUI and the analysis engine both reflect the changes. The STD file is processed by the STAAD analysis  to produce results that are stored in several files with extensions such as ANL, BMD, TMH, etc. The ANL text file contains the printable output as created by the specifications in this manual. The other files contain the results (displacements, member/element forces, mode shapes, section forces/moments/displacements, etc.) that are used by the GUI in post processing mode. This section of the manual contains a general description of the analysis and design facilities available in the STAAD engine.

The objective of this section is to familiarize the user with the basic principles involved in the implementation of the various analysis/design facilities offered by the STAAD engine. As a general rule, the sequence in which the facilities are discussed follows the recommended sequence of their usage in the STD input file.