Steel member design/check errors

SPACE GASS performs numerous checks for illegal and inconsistent data. Many of these checks are done in the steel member design data input modules and any errors detected there must be corrected immediately. However, some errors such as faulty member groupings cannot be detected until the design/check phase.

 

All of the errors in the following list cause SPACE GASS to abort the design or check of the current design group and move on to the next group. If an error occurs during a design or an uninterrupted check, the program continues without alerting you and puts the error message in the output report. Alternatively, if an error occurs during an interrupted check, the program pauses to display the message and, if it is a section related error, gives you the opportunity to manually select other sections to be checked.

 

Warnings also appear in the output report but they do not cause SPACE GASS to abort the design or check of the current design group.

 

This group contains a non-existent or repeated member

One of the analysis members nominated in the design group does not exist or has been repeated.

 

Members in this group are not of the same section type

All analysis members in the design group must have the same section property number.

 

This group does not have a contiguous run of members

All of the analysis members nominated in the design group must be connected together end-to-end in the frame analysis model. They must also be listed in the design group in the order that they are connected (from either end).

 

A tens/comp-only member in this group is disabled

One of the analysis members in the design group is a tension-only or compression-only member which has been disabled during the analysis, thus leaving a gap in the group.

 

A member in this group has buckled

One of the analysis members in the design group has buckled during the analysis, thus leaving a gap in the group.

 

Stations per member limit has been exceeded

The stations per analysis member limit has been exceeded or the stations per design group limit has been exceeded.

 

There is a limit of 500 stations per analysis member which must be enough for the number of intermediate member stations that you specify, plus the extra stations at the ends, at concentrated member loads and at flange restraint points. The solution is to either add a node at midspan of the analysis member which has too many stations or decrease the number of stations that you specify at the start of the member design/check phase.

 

A flange restraint is off the end of the member group

One or more flange restraints have been specified beyond the end of the design group.

 

Inappropriate group code or shape not supported

The section data from the library has an invalid group code or shape code (see also Section libraries).

 

Starred angles cannot be made up from unequal angles

Starred angles can only be made from equal angle sections.

 

Starred angles are not supported for this design code

This is a restriction in the AS4100, BS5950 and NZS3404 modules.

 

This section shape not supported for this design code

The selected steel member design module does not support the shape of the section currently being designed or checked.

 

Inappropriate end connection code for this section

An end connection code which is inappropriate for the section being considered has been input. For example, an I or H section can have end codes of "Flange(s)", "Web" or "Centroid", or a single angle section can have end codes of "Short" or "Long". Note that single angle sections cannot have end connection codes of "Centroid". If eccentric effects for angles are to be ignored, they must be disabled at the start of the member design/check phase.

 

Invalid fabrication code for this section

The section data from the library has an invalid fabrication code (see also Section libraries) or a rolled section has a fabrication code which shows it to be welded.

 

Inappropriate section dimensions for this design code

A code specific constraint on section dimensions has not been met. For example, the BS5950 module requires channels to have equal flanges. For dimension constraints, see also Steel member design/check assumptions.

 

No suitable section found

The steel member design module has found that all sections from the library which comply with the library scan code are inadequate.

 

WARNING: You have suppressed eccentric end connection effects

If eccentric end effects for members which are not connected concentrically have been disabled at the start of the design/check phase then this warning appears in the output report.

 

WARNING: Not all load cases considered have been analysed non-linearly

For AS4100 and NZS3404, a warning appears in the output report if any member design/check load cases have only been analysed linearly.

 

WARNING: Web is inadequate for combined actions (App I) (Lf=#.##)

For AS4100 and NZS3404, a warning appears in the output report if the web is inadequate. It suggests that web stiffeners may be required. The web failure load factor is also given.

 

WARNING: Angle calculations do not consider bending moments. Do a manual check

For AS1250, SABS0162 and AS3990, the calculations for angle sections do not consider bending moments (apart from eccentric end moments). They should be checked manually.