10.1 Overview

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Files of type input may start with a

*HEADING

followed by a comment, e.g. a short problem description.

Furthermore, such files are organized through sections. Every section starts with a section keyword which may be followed by options in the same line. Options and keywords are generally separated by commas.

The following section keywords are currently used:

	followed by
`*NODE`	Nodal data
`*SOLID SECTION`	Definitions for bars, trusses, plates with reference
	to material types and element types
`*BEAM SECTION`	Definitions for beam structures with reference
	to material types and element types
`*SHELL SECTION`	Definitions for slab and shell structures with reference
	to material types and element types
`*MATERIAL`	Material types and their parameters
`*ELEMENT`	Element data
`*BEAM REINF`	Reinforcement data
`*STEP`	Definitions for type of simulation, the incrementally
	iterative procedure to be used, boundary conditions,
	loading and output intervals

A section keyword starts section data until the next section keyword is set.

A section keyword may have options in the same (mandatory) line.
A section keyword is followed by data lines or further lines with (optional) sub-keywords. Sub-keywords in further lines start with a *. Sub-keywords may also be followed by data lines.

A section keyword *STEP marks a simulation step. Steps have to be distinguished from time increments.

A step corresponds to a period with the application of a particular simulation type on the model. A step comprises a sequence of time increments.
A whole simulation must have at least one step but may consist of a sequence of steps, e.g. a step with a dynamic simulation may follow a quasistatic simulation whereby the final state of the former defines the initial state of the latter.

A line with leading ** may be used as comment line and is ignored. Leading blanks, intermediate blanks and blank lines are generally ignored.

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