CFS Version 13 Changes Released September 2021

• Implemented the Effective Width calculations for cover plated members with intermittent fasteners.
• Increased upper limit on Wind Load to 300 psf to support ASCE factored loads.
• Changed "Width" label in the properties report to "Flat" to distinguish from the overall section width.
• Provided more trace details for Direct Strength Method (DSM) calculations.
• Cleaned up calculation trace for web crippling strength of members without holes.
• Use kɸ in distortional buckling axial load calculation for the braced flange.
• Improved messages related to improper geometry imported from DXF file.
• Provided example DXF file to assist in understanding geometry requirements.
• Applied the more conservative rational analysis factors to additional cases:
  • Strength calculation for braced tension flange where section geometry does not comply.
  • Shear and web crippling strength where hole is not at mid-depth.
  • Bending and web crippling interaction equations if required in determining the individual strengths.
  • Intermediate stiffeners under stress gradient using the Effective Width Method.
  • Width-to-thickness ratio limits now use full element widths disregarding intermediate stiffeners.
• Included more analysis checkpoints to ensure controlling location is represented.
• Member check locations at left or right side of a support are stated as above or below for vertical members.
• Default file names for saving new sections and analyses now use the entered descriptions.
• License activation presented more visibly on Welcome screen.
• Implemented a FIPS compliant version of the license verification system.

• Increased upper limit on DSM load ratios to 1000 to better support inelastic reserve strength.
• Allow shorter half-wavelengths in the elastic buckling analysis.
• Included Gross/Net designation, work ratio, and buckling mode in Copy Data feature.
• Improved buckling mode categorization with changes to the work ratio calculation.
• Revised SFIA and SSMA section libraries to utilize revised elastic buckling results for DSM.
• Increased number of nodes for panel sections to better identify buckling modes.
• Fixed work ratio calculation for the alternate solution method.
• Fixed problem with a section having a hole next to the bend radius.
• Fixed problem with the rare case of a double root in the solution.

• Multiple simultaneous instances of the Calculation object are fully supported for multi-threaded applications.
• Added plastic section modulus properties Zx and Zy to SectionProperties class.
• Depth property of the SectionData class is not required for creating angle sections.
• HoleLength and HoleSpacing properties of the SectionData class are now read-only.

• Corrected design stress for tension yield in stainless steel members.
• Corrected equation numbers shown in trace for stainless steel buckling stress calculations.
• Corrected spelling of "Dead Load" in analyses created by Quick Design.
• Corrected R/t limits for certain web crippling cases that changed with Specification edition.
• When defining a custom material, modify existing DSM ratios for the new yield strength.
• Fixed display of custom material name after being edited.
• Properly show the input values of ex and ey in analysis member checks.
• Improved checking of intermediate stiffeners for closed sections.